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19 <p class="apache">Apache HTTP Server Version 2.5</p>
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23 <a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.5</a> > <a href="./">Modules</a></div>
24 <div id="page-content">
25 <div id="preamble"><h1>Apache Module mod_lua</h1>
27 <p><span>Available Languages: </span><a href="../en/mod/mod_lua.html" title="English"> en </a> |
28 <a href="../fr/mod/mod_lua.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
30 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Provides Lua hooks into various portions of the httpd
31 request processing</td></tr>
32 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
33 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>lua_module</td></tr>
34 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_lua.c</td></tr>
35 <tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>2.3 and later</td></tr></table>
38 <p>This module allows the server to be extended with scripts written in the
39 Lua programming language. The extension points (hooks) available with
40 <code class="module"><a href="../mod/mod_lua.html">mod_lua</a></code> include many of the hooks available to
41 natively compiled Apache HTTP Server modules, such as mapping requests to
42 files, generating dynamic responses, access control, authentication, and
45 <p>More information on the Lua programming language can be found at the
46 <a href="http://www.lua.org/">the Lua website</a>.</p>
48 <div class="note"><code>mod_lua</code> is still in experimental state.
49 Until it is declared stable, usage and behavior may change
50 at any time, even between stable releases of the 2.4.x series.
51 Be sure to check the CHANGES file before upgrading.</div>
53 <div class="warning"><h3>Warning</h3>
54 <p>This module holds a great deal of power over httpd, which is both a
55 strength and a potential security risk. It is <strong>not</strong> recommended
56 that you use this module on a server that is shared with users you do not
57 trust, as it can be abused to change the internal workings of httpd.</p>
61 <div id="quickview"><h3 class="directives">Directives</h3>
63 <li><img alt="" src="../images/down.gif" /> <a href="#luaauthzprovider">LuaAuthzProvider</a></li>
64 <li><img alt="" src="../images/down.gif" /> <a href="#luacodecache">LuaCodeCache</a></li>
65 <li><img alt="" src="../images/down.gif" /> <a href="#luahookaccesschecker">LuaHookAccessChecker</a></li>
66 <li><img alt="" src="../images/down.gif" /> <a href="#luahookauthchecker">LuaHookAuthChecker</a></li>
67 <li><img alt="" src="../images/down.gif" /> <a href="#luahookcheckuserid">LuaHookCheckUserID</a></li>
68 <li><img alt="" src="../images/down.gif" /> <a href="#luahookfixups">LuaHookFixups</a></li>
69 <li><img alt="" src="../images/down.gif" /> <a href="#luahookinsertfilter">LuaHookInsertFilter</a></li>
70 <li><img alt="" src="../images/down.gif" /> <a href="#luahooklog">LuaHookLog</a></li>
71 <li><img alt="" src="../images/down.gif" /> <a href="#luahookmaptostorage">LuaHookMapToStorage</a></li>
72 <li><img alt="" src="../images/down.gif" /> <a href="#luahooktranslatename">LuaHookTranslateName</a></li>
73 <li><img alt="" src="../images/down.gif" /> <a href="#luahooktypechecker">LuaHookTypeChecker</a></li>
74 <li><img alt="" src="../images/down.gif" /> <a href="#luainherit">LuaInherit</a></li>
75 <li><img alt="" src="../images/down.gif" /> <a href="#luainputfilter">LuaInputFilter</a></li>
76 <li><img alt="" src="../images/down.gif" /> <a href="#luamaphandler">LuaMapHandler</a></li>
77 <li><img alt="" src="../images/down.gif" /> <a href="#luaoutputfilter">LuaOutputFilter</a></li>
78 <li><img alt="" src="../images/down.gif" /> <a href="#luapackagecpath">LuaPackageCPath</a></li>
79 <li><img alt="" src="../images/down.gif" /> <a href="#luapackagepath">LuaPackagePath</a></li>
80 <li><img alt="" src="../images/down.gif" /> <a href="#luaquickhandler">LuaQuickHandler</a></li>
81 <li><img alt="" src="../images/down.gif" /> <a href="#luaroot">LuaRoot</a></li>
82 <li><img alt="" src="../images/down.gif" /> <a href="#luascope">LuaScope</a></li>
86 <li><img alt="" src="../images/down.gif" /> <a href="#basicconf">Basic Configuration</a></li>
87 <li><img alt="" src="../images/down.gif" /> <a href="#writinghandlers">Writing Handlers</a></li>
88 <li><img alt="" src="../images/down.gif" /> <a href="#writingauthzproviders">Writing Authorization Providers</a></li>
89 <li><img alt="" src="../images/down.gif" /> <a href="#writinghooks">Writing Hooks</a></li>
90 <li><img alt="" src="../images/down.gif" /> <a href="#datastructures">Data Structures</a></li>
91 <li><img alt="" src="../images/down.gif" /> <a href="#functions">Built in functions</a></li>
92 <li><img alt="" src="../images/down.gif" /> <a href="#logging">Logging Functions</a></li>
93 <li><img alt="" src="../images/down.gif" /> <a href="#apache2">apache2 Package</a></li>
94 <li><img alt="" src="../images/down.gif" /> <a href="#modifying_buckets">Modifying contents with Lua filters</a></li>
95 <li><img alt="" src="../images/down.gif" /> <a href="#databases">Database connectivity</a></li>
96 </ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
97 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
99 <h2><a name="basicconf" id="basicconf">Basic Configuration</a></h2>
101 <p>The basic module loading directive is</p>
103 <pre class="prettyprint lang-config">LoadModule lua_module modules/mod_lua.so</pre>
107 <code>mod_lua</code> provides a handler named <code>lua-script</code>,
108 which can be used with an <code>AddHandler</code> directive:</p>
110 <pre class="prettyprint lang-config">AddHandler lua-script .lua</pre>
114 This will cause <code>mod_lua</code> to handle requests for files
115 ending in <code>.lua</code> by invoking that file's
116 <code>handle</code> function.
119 <p>For more flexibility, see <code class="directive">LuaMapHandler</code>.
122 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
123 <div class="section">
124 <h2><a name="writinghandlers" id="writinghandlers">Writing Handlers</a></h2>
125 <p> In the Apache HTTP Server API, the handler is a specific kind of hook
126 responsible for generating the response. Examples of modules that include a
127 handler are <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>, <code class="module"><a href="../mod/mod_cgi.html">mod_cgi</a></code>,
128 and <code class="module"><a href="../mod/mod_status.html">mod_status</a></code>.</p>
130 <p><code>mod_lua</code> always looks to invoke a Lua function for the handler, rather than
131 just evaluating a script body CGI style. A handler function looks
132 something like this:</p>
135 <pre class="prettyprint lang-lua">
136 <strong>example.lua</strong><br />
142 This is the default method name for Lua handlers, see the optional
143 function-name in the LuaMapHandler directive to choose a different
147 r.content_type = "text/plain"
149 if r.method == 'GET' then
150 r:puts("Hello Lua World!\n")
151 for k, v in pairs( r:parseargs() ) do
152 r:puts( string.format("%s: %s\n", k, v) )
154 elseif r.method == 'POST' then
155 r:puts("Hello Lua World!\n")
156 for k, v in pairs( r:parsebody() ) do
157 r:puts( string.format("%s: %s\n", k, v) )
159 elseif r.method == 'PUT' then
160 -- use our own Error contents
161 r:puts("Unsupported HTTP method " .. r.method)
165 -- use the ErrorDocument
173 This handler function just prints out the uri or form encoded
174 arguments to a plaintext page.
178 This means (and in fact encourages) that you can have multiple
179 handlers (or hooks, or filters) in the same script.
182 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
183 <div class="section">
184 <h2><a name="writingauthzproviders" id="writingauthzproviders">Writing Authorization Providers</a></h2>
187 <p><code class="module"><a href="../mod/mod_authz_core.html">mod_authz_core</a></code> provides a high-level interface to
188 authorization that is much easier to use than using into the relevant
189 hooks directly. The first argument to the
190 <code class="directive"><a href="../mod/mod_authz_core.html#require">Require</a></code> directive gives
191 the name of the responsible authorization provider. For any
192 <code class="directive"><a href="../mod/mod_authz_core.html#require">Require</a></code> line,
193 <code class="module"><a href="../mod/mod_authz_core.html">mod_authz_core</a></code> will call the authorization provider
194 of the given name, passing the rest of the line as parameters. The
195 provider will then check authorization and pass the result as return
198 <p>The authz provider is normally called before authentication. If it needs to
199 know the authenticated user name (or if the user will be authenticated at
200 all), the provider must return <code>apache2.AUTHZ_DENIED_NO_USER</code>.
201 This will cause authentication to proceed and the authz provider to be
202 called a second time.</p>
204 <p>The following authz provider function takes two arguments, one ip
205 address and one user name. It will allow access from the given ip address
206 without authentication, or if the authenticated user matches the second
209 <pre class="prettyprint lang-lua">
210 <strong>authz_provider.lua</strong><br />
214 function authz_check_foo(r, ip, user)
215 if r.useragent_ip == ip then
216 return apache2.AUTHZ_GRANTED
217 elseif r.user == nil then
218 return apache2.AUTHZ_DENIED_NO_USER
219 elseif r.user == user then
220 return apache2.AUTHZ_GRANTED
222 return apache2.AUTHZ_DENIED
227 <p>The following configuration registers this function as provider
228 <code>foo</code> and configures it for URL <code>/</code>:</p>
229 <pre class="prettyprint lang-config">LuaAuthzProvider foo authz_provider.lua authz_check_foo
231 Require foo 10.1.2.3 john_doe
232 </Location></pre>
235 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
236 <div class="section">
237 <h2><a name="writinghooks" id="writinghooks">Writing Hooks</a></h2>
239 <p>Hook functions are how modules (and Lua scripts) participate in the
240 processing of requests. Each type of hook exposed by the server exists for
241 a specific purpose, such as mapping requests to the file system,
242 performing access control, or setting mime types:</p>
244 <table class="bordered"><tr class="header">
246 <th>mod_lua directive</th>
250 <td>Quick handler</td>
251 <td><code class="directive"><a href="#luaquickhandler">LuaQuickHandler</a></code></td>
252 <td>This is the first hook that will be called after a request has
253 been mapped to a host or virtual host</td>
256 <td>Translate name</td>
257 <td><code class="directive"><a href="#luahooktranslatename">LuaHookTranslateName</a></code></td>
258 <td>This phase translates the requested URI into a filename on the
259 system. Modules such as <code class="module"><a href="../mod/mod_alias.html">mod_alias</a></code> and
260 <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> operate in this phase.</td>
263 <td>Map to storage</td>
264 <td><code class="directive"><a href="#luahookmaptostorage">LuaHookMapToStorage</a></code></td>
265 <td>This phase maps files to their physical, cached or external/proxied storage.
266 It can be used by proxy or caching modules</td>
269 <td>Check Access</td>
270 <td><code class="directive"><a href="#luahookaccesschecker">LuaHookAccessChecker</a></code></td>
271 <td>This phase checks whether a client has access to a resource. This
272 phase is run before the user is authenticated, so beware.
276 <td>Check User ID</td>
277 <td><code class="directive"><a href="#luahookcheckuserid">LuaHookCheckUserID</a></code></td>
278 <td>This phase it used to check the negotiated user ID</td>
281 <td>Check Authorization</td>
282 <td><code class="directive"><a href="#luahookauthchecker">LuaHookAuthChecker</a></code> or
283 <code class="directive"><a href="#luaauthzprovider">LuaAuthzProvider</a></code></td>
284 <td>This phase authorizes a user based on the negotiated credentials, such as
285 user ID, client certificate etc.
290 <td><code class="directive"><a href="#luahooktypechecker">LuaHookTypeChecker</a></code></td>
291 <td>This phase checks the requested file and assigns a content type and
296 <td><code class="directive"><a href="#luahookfixups">LuaHookFixups</a></code></td>
297 <td>This is the final "fix anything" phase before the content handlers
298 are run. Any last-minute changes to the request should be made here.</td>
301 <td>Content handler</td>
302 <td>fx. <code>.lua</code> files or through <code class="directive"><a href="#luamaphandler">LuaMapHandler</a></code></td>
303 <td>This is where the content is handled. Files are read, parsed, some are run,
304 and the result is sent to the client</td>
308 <td><code class="directive"><a href="#luahooklog">LuaHookLog</a></code></td>
309 <td>Once a request has been handled, it enters several logging phases,
310 which logs the request in either the error or access log. Mod_lua
311 is able to hook into the start of this and control logging output.</td>
315 <p>Hook functions are passed the request object as their only argument
316 (except for LuaAuthzProvider, which also gets passed the arguments from
317 the Require directive).
318 They can return any value, depending on the hook, but most commonly
319 they'll return OK, DONE, or DECLINED, which you can write in Lua as
320 <code>apache2.OK</code>, <code>apache2.DONE</code>, or
321 <code>apache2.DECLINED</code>, or else an HTTP status code.</p>
324 <pre class="prettyprint lang-lua">
325 <strong>translate_name.lua</strong><br />
326 -- example hook that rewrites the URI to a filesystem path.
330 function translate_name(r)
331 if r.uri == "/translate-name" then
332 r.filename = r.document_root .. "/find_me.txt"
335 -- we don't care about this URL, give another module a chance
336 return apache2.DECLINED
341 <pre class="prettyprint lang-lua">
342 <strong>translate_name2.lua</strong><br />
343 --[[ example hook that rewrites one URI to another URI. It returns a
344 apache2.DECLINED to give other URL mappers a chance to work on the
345 substitution, including the core translate_name hook which maps based
348 Note: Use the early/late flags in the directive to make it run before
354 function translate_name(r)
355 if r.uri == "/translate-name" then
356 r.uri = "/find_me.txt"
357 return apache2.DECLINED
359 return apache2.DECLINED
362 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
363 <div class="section">
364 <h2><a name="datastructures" id="datastructures">Data Structures</a></h2>
369 <p>The request_rec is mapped in as a userdata. It has a metatable
370 which lets you do useful things with it. For the most part it
371 has the same fields as the request_rec struct, many of which are writable as
372 well as readable. (The table fields' content can be changed, but the
373 fields themselves cannot be set to different tables.)</p>
375 <table class="bordered"><tr class="header">
376 <th><strong>Name</strong></th>
377 <th><strong>Lua type</strong></th>
378 <th><strong>Writable</strong></th>
379 <th><strong>Description</strong></th>
382 <td><code>allowoverrides</code></td>
385 <td>The AllowOverride options applied to the current request.</td>
388 <td><code>ap_auth_type</code></td>
391 <td>If an authentication check was made, this is set to the type
392 of authentication (f.x. <code>basic</code>)</td>
395 <td><code>args</code></td>
398 <td>The query string arguments extracted from the request
399 (f.x. <code>foo=bar&name=johnsmith</code>)</td>
402 <td><code>assbackwards</code></td>
405 <td>Set to true if this is an HTTP/0.9 style request
406 (e.g. <code>GET /foo</code> (with no headers) )</td>
409 <td><code>auth_name</code></td>
412 <td>The realm name used for authorization (if applicable).</td>
415 <td><code>banner</code></td>
418 <td>The server banner, f.x. <code>Apache HTTP Server/2.4.3 openssl/0.9.8c</code></td>
421 <td><code>basic_auth_pw</code></td>
424 <td>The basic auth password sent with this request, if any</td>
427 <td><code>canonical_filename</code></td>
430 <td>The canonical filename of the request</td>
433 <td><code>content_encoding</code></td>
436 <td>The content encoding of the current request</td>
439 <td><code>content_type</code></td>
442 <td>The content type of the current request, as determined in the
443 type_check phase (f.x. <code>image/gif</code> or <code>text/html</code>)</td>
446 <td><code>context_prefix</code></td>
452 <td><code>context_document_root</code></td>
458 <td><code>document_root</code></td>
461 <td>The document root of the host</td>
464 <td><code>err_headers_out</code></td>
467 <td>MIME header environment for the response, printed even on errors and
468 persist across internal redirects</td>
471 <td><code>filename</code></td>
474 <td>The file name that the request maps to, f.x. /www/example.com/foo.txt. This can be
475 changed in the translate-name or map-to-storage phases of a request to allow the
476 default handler (or script handlers) to serve a different file than what was requested.</td>
479 <td><code>handler</code></td>
482 <td>The name of the <a href="../handler.html">handler</a> that should serve this request, f.x.
483 <code>lua-script</code> if it is to be served by mod_lua. This is typically set by the
484 <code class="directive"><a href="../mod/mod_mime.html#addhandler">AddHandler</a></code> or <code class="directive"><a href="../mod/core.html#sethandler">SetHandler</a></code>
485 directives, but could also be set via mod_lua to allow another handler to serve up a specific request
486 that would otherwise not be served by it.
490 <td><code>headers_in</code></td>
493 <td>MIME header environment from the request. This contains headers such as <code>Host,
494 User-Agent, Referer</code> and so on.</td>
497 <td><code>headers_out</code></td>
500 <td>MIME header environment for the response.</td>
503 <td><code>hostname</code></td>
506 <td>The host name, as set by the <code>Host:</code> header or by a full URI.</td>
509 <td><code>is_https</code></td>
512 <td>Whether or not this request is done via HTTPS</td>
515 <td><code>is_initial_req</code></td>
518 <td>Whether this request is the initial request or a sub-request</td>
521 <td><code>limit_req_body</code></td>
524 <td>The size limit of the request body for this request, or 0 if no limit.</td>
527 <td><code>log_id</code></td>
530 <td>The ID to identify request in access and error log.</td>
533 <td><code>method</code></td>
536 <td>The request method, f.x. <code>GET</code> or <code>POST</code>.</td>
539 <td><code>notes</code></td>
542 <td>A list of notes that can be passed on from one module to another.</td>
545 <td><code>options</code></td>
548 <td>The Options directive applied to the current request.</td>
551 <td><code>path_info</code></td>
554 <td>The PATH_INFO extracted from this request.</td>
557 <td><code>port</code></td>
560 <td>The server port used by the request.</td>
563 <td><code>protocol</code></td>
566 <td>The protocol used, f.x. <code>HTTP/1.1</code></td>
569 <td><code>proxyreq</code></td>
572 <td>Denotes whether this is a proxy request or not. This value is generally set in
573 the post_read_request/translate_name phase of a request.</td>
576 <td><code>range</code></td>
579 <td>The contents of the <code>Range:</code> header.</td>
582 <td><code>remaining</code></td>
585 <td>The number of bytes remaining to be read from the request body.</td>
588 <td><code>server_built</code></td>
591 <td>The time the server executable was built.</td>
594 <td><code>server_name</code></td>
597 <td>The server name for this request.</td>
600 <td><code>some_auth_required</code></td>
603 <td>Whether some authorization is/was required for this request.</td>
606 <td><code>subprocess_env</code></td>
609 <td>The environment variables set for this request.</td>
612 <td><code>started</code></td>
615 <td>The time the server was (re)started, in seconds since the epoch (Jan 1st, 1970)</td>
618 <td><code>status</code></td>
621 <td>The (current) HTTP return code for this request, f.x. <code>200</code> or <code>404</code>.</td>
624 <td><code>the_request</code></td>
627 <td>The request string as sent by the client, f.x. <code>GET /foo/bar HTTP/1.1</code>.</td>
630 <td><code>unparsed_uri</code></td>
633 <td>The unparsed URI of the request</td>
636 <td><code>uri</code></td>
639 <td>The URI after it has been parsed by httpd</td>
642 <td><code>user</code></td>
645 <td>If an authentication check has been made, this is set to the name of the authenticated user.</td>
648 <td><code>useragent_ip</code></td>
651 <td>The IP of the user agent making the request</td>
656 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
657 <div class="section">
658 <h2><a name="functions" id="functions">Built in functions</a></h2>
660 <p>The request_rec object has (at least) the following methods:</p>
662 <pre class="prettyprint lang-lua">r:flush() -- flushes the output buffer.
663 -- Returns true if the flush was successful, false otherwise.
665 while we_have_stuff_to_send do
666 r:puts("Bla bla bla\n") -- print something to client
667 r:flush() -- flush the buffer (send to client)
668 r.usleep(500000) -- fake processing time for 0.5 sec. and repeat
672 <pre class="prettyprint lang-lua">r:addoutputfilter(name|function) -- add an output filter:
674 r:addoutputfilter("fooFilter") -- add the fooFilter to the output stream</pre>
677 <pre class="prettyprint lang-lua">r:sendfile(filename) -- sends an entire file to the client, using sendfile if supported by the current platform:
679 if use_sendfile_thing then
680 r:sendfile("/var/www/large_file.img")
684 <pre class="prettyprint lang-lua">r:parseargs() -- returns two tables; one standard key/value table for regular GET data,
685 -- and one for multi-value data (fx. foo=1&foo=2&foo=3):
687 local GET, GETMULTI = r:parseargs()
688 r:puts("Your name is: " .. GET['name'] or "Unknown")</pre>
691 <pre class="prettyprint lang-lua">r:parsebody([sizeLimit]) -- parse the request body as a POST and return two lua tables,
692 -- just like r:parseargs().
693 -- An optional number may be passed to specify the maximum number
694 -- of bytes to parse. Default is 8192 bytes:
696 local POST, POSTMULTI = r:parsebody(1024*1024)
697 r:puts("Your name is: " .. POST['name'] or "Unknown")</pre>
700 <pre class="prettyprint lang-lua">r:puts("hello", " world", "!") -- print to response body, self explanatory</pre>
703 <pre class="prettyprint lang-lua">r:write("a single string") -- print to response body, self explanatory</pre>
706 <pre class="prettyprint lang-lua">r:escape_html("<html>test</html>") -- Escapes HTML code and returns the escaped result</pre>
709 <pre class="prettyprint lang-lua">r:base64_encode(string) -- Encodes a string using the Base64 encoding standard:
711 local encoded = r:base64_encode("This is a test") -- returns VGhpcyBpcyBhIHRlc3Q=</pre>
714 <pre class="prettyprint lang-lua">r:base64_decode(string) -- Decodes a Base64-encoded string:
716 local decoded = r:base64_decode("VGhpcyBpcyBhIHRlc3Q=") -- returns 'This is a test'</pre>
719 <pre class="prettyprint lang-lua">r:md5(string) -- Calculates and returns the MD5 digest of a string (binary safe):
721 local hash = r:md5("This is a test") -- returns ce114e4501d2f4e2dcea3e17b546f339</pre>
724 <pre class="prettyprint lang-lua">r:sha1(string) -- Calculates and returns the SHA1 digest of a string (binary safe):
726 local hash = r:sha1("This is a test") -- returns a54d88e06612d820bc3be72877c74f257b561b19</pre>
729 <pre class="prettyprint lang-lua">r:escape(string) -- URL-Escapes a string:
731 local url = "http://foo.bar/1 2 3 & 4 + 5"
732 local escaped = r:escape(url) -- returns 'http%3a%2f%2ffoo.bar%2f1+2+3+%26+4+%2b+5'</pre>
735 <pre class="prettyprint lang-lua">r:unescape(string) -- Unescapes an URL-escaped string:
737 local url = "http%3a%2f%2ffoo.bar%2f1+2+3+%26+4+%2b+5"
738 local unescaped = r:unescape(url) -- returns 'http://foo.bar/1 2 3 & 4 + 5'</pre>
741 <pre class="prettyprint lang-lua">r:construct_url(string) -- Constructs an URL from an URI
743 local url = r:construct_url(r.uri)</pre>
746 <pre class="prettyprint lang-lua">r.mpm_query(number) -- Queries the server for MPM information using ap_mpm_query:
748 local mpm = r.mpm_query(14)
750 r:puts("This server uses the Event MPM")
754 <pre class="prettyprint lang-lua">r:expr(string) -- Evaluates an <a href="../expr.html">expr</a> string.
756 if r:expr("%{HTTP_HOST} =~ /^www/") then
757 r:puts("This host name starts with www")
761 <pre class="prettyprint lang-lua">r:scoreboard_process(a) -- Queries the server for information about the process at position <code>a</code>:
763 local process = r:scoreboard_process(1)
764 r:puts("Server 1 has PID " .. process.pid)</pre>
767 <pre class="prettyprint lang-lua">r:scoreboard_worker(a, b) -- Queries for information about the worker thread, <code>b</code>, in process <code>a</code>:
769 local thread = r:scoreboard_worker(1, 1)
770 r:puts("Server 1's thread 1 has thread ID " .. thread.tid .. " and is in " .. thread.status .. " status")</pre>
774 <pre class="prettyprint lang-lua">r:clock() -- Returns the current time with microsecond precision</pre>
777 <pre class="prettyprint lang-lua">r:requestbody(filename) -- Reads and returns the request body of a request.
778 -- If 'filename' is specified, it instead saves the
779 -- contents to that file:
781 local input = r:requestbody()
782 r:puts("You sent the following request body to me:\n")
786 <pre class="prettyprint lang-lua">r:add_input_filter(filter_name) -- Adds 'filter_name' as an input filter</pre>
789 <pre class="prettyprint lang-lua">r.module_info(module_name) -- Queries the server for information about a module
791 local mod = r.module_info("mod_lua.c")
793 for k, v in pairs(mod.commands) do
794 r:puts( ("%s: %s\n"):format(k,v)) -- print out all directives accepted by this module
799 <pre class="prettyprint lang-lua">r:loaded_modules() -- Returns a list of modules loaded by httpd:
801 for k, module in pairs(r:loaded_modules()) do
802 r:puts("I have loaded module " .. module .. "\n")
806 <pre class="prettyprint lang-lua">r:runtime_dir_relative(filename) -- Compute the name of a run-time file (e.g., shared memory "file")
807 -- relative to the appropriate run-time directory.</pre>
810 <pre class="prettyprint lang-lua">r:server_info() -- Returns a table containing server information, such as
811 -- the name of the httpd executable file, mpm used etc.</pre>
814 <pre class="prettyprint lang-lua">r:set_document_root(file_path) -- Sets the document root for the request to file_path</pre>
819 <pre class="prettyprint lang-lua">r:set_context_info(prefix, docroot) -- Sets the context prefix and context document root for a request</pre>
822 <pre class="prettyprint lang-lua">r:os_escape_path(file_path) -- Converts an OS path to a URL in an OS dependent way</pre>
825 <pre class="prettyprint lang-lua">r:escape_logitem(string) -- Escapes a string for logging</pre>
828 <pre class="prettyprint lang-lua">r.strcmp_match(string, pattern) -- Checks if 'string' matches 'pattern' using strcmp_match (globs).
829 -- fx. whether 'www.example.com' matches '*.example.com':
831 local match = r.strcmp_match("foobar.com", "foo*.com")
833 r:puts("foobar.com matches foo*.com")
837 <pre class="prettyprint lang-lua">r:set_keepalive() -- Sets the keepalive status for a request. Returns true if possible, false otherwise.</pre>
840 <pre class="prettyprint lang-lua">r:make_etag() -- Constructs and returns the etag for the current request.</pre>
843 <pre class="prettyprint lang-lua">r:send_interim_response(clear) -- Sends an interim (1xx) response to the client.
844 -- if 'clear' is true, available headers will be sent and cleared.</pre>
847 <pre class="prettyprint lang-lua">r:custom_response(status_code, string) -- Construct and set a custom response for a given status code.
848 -- This works much like the ErrorDocument directive:
850 r:custom_response(404, "Baleted!")</pre>
853 <pre class="prettyprint lang-lua">r.exists_config_define(string) -- Checks whether a configuration definition exists or not:
855 if r.exists_config_define("FOO") then
856 r:puts("httpd was probably run with -DFOO, or it was defined in the configuration")
860 <pre class="prettyprint lang-lua">r:state_query(string) -- Queries the server for state information</pre>
863 <pre class="prettyprint lang-lua">r:stat(filename [,wanted]) -- Runs stat() on a file, and returns a table with file information:
865 local info = r:stat("/var/www/foo.txt")
867 r:puts("This file exists and was last modified at: " .. info.modified)
871 <pre class="prettyprint lang-lua">r:regex(string, pattern [,flags]) -- Runs a regular expression match on a string, returning captures if matched:
873 local matches = r:regex("foo bar baz", [[foo (\w+) (\S*)]])
875 r:puts("The regex matched, and the last word captured ($2) was: " .. matches[2])
878 -- Example ignoring case sensitivity:
879 local matches = r:regex("FOO bar BAz", [[(foo) bar]], 1)
881 -- Flags can be a bitwise combination of:
883 -- 0x02: Multiline search</pre>
886 <pre class="prettyprint lang-lua">r.usleep(number_of_microseconds) -- Puts the script to sleep for a given number of microseconds.</pre>
889 <pre class="prettyprint lang-lua">r:dbacquire(dbType[, dbParams]) -- Acquires a connection to a database and returns a database class.
890 -- See '<a href="#databases">Database connectivity</a>' for details.</pre>
893 <pre class="prettyprint lang-lua">r:ivm_set("key", value) -- Set an Inter-VM variable to hold a specific value.
894 -- These values persist even though the VM is gone or not being used,
895 -- and so should only be used if MaxConnectionsPerChild is > 0
896 -- Values can be numbers, strings and booleans, and are stored on a
897 -- per process basis (so they won't do much good with a prefork mpm)
899 r:ivm_get("key") -- Fetches a variable set by ivm_set. Returns the contents of the variable
900 -- if it exists or nil if no such variable exists.
902 -- An example getter/setter that saves a global variable outside the VM:
904 -- First VM to call this will get no value, and will have to create it
905 local foo = r:ivm_get("cached_data")
907 foo = do_some_calcs() -- fake some return value
908 r:ivm_set("cached_data", foo) -- set it globally
910 r:puts("Cached data is: ", foo)
914 <pre class="prettyprint lang-lua">r:htpassword(string [,algorithm [,cost]]) -- Creates a password hash from a string.
915 -- algorithm: 0 = APMD5 (default), 1 = SHA, 2 = BCRYPT, 3 = CRYPT.
916 -- cost: only valid with BCRYPT algorithm (default = 5).</pre>
919 <pre class="prettyprint lang-lua">r:mkdir(dir [,mode]) -- Creates a directory and sets mode to optional mode paramter.</pre>
922 <pre class="prettyprint lang-lua">r:mkrdir(dir [,mode]) -- Creates directories recursive and sets mode to optional mode paramter.</pre>
925 <pre class="prettyprint lang-lua">r:rmdir(dir) -- Removes a directory.</pre>
928 <pre class="prettyprint lang-lua">r:touch(file [,mtime]) -- Sets the file modification time to current time or to optional mtime msec value.</pre>
931 <pre class="prettyprint lang-lua">r:get_direntries(dir) -- Returns a table with all directory entries.
934 local dir = r.context_document_root
935 for _, f in ipairs(r:get_direntries(dir)) do
936 local info = r:stat(dir .. "/" .. f)
938 local mtime = os.date(fmt, info.mtime / 1000000)
939 local ftype = (info.filetype == 2) and "[dir] " or "[file]"
940 r:puts( ("%s %s %10i %s\n"):format(ftype, mtime, info.size, f) )
946 <pre class="prettyprint lang-lua">r.date_parse_rfc(string) -- Parses a date/time string and returns seconds since epoche.</pre>
949 <pre class="prettyprint lang-lua">r:getcookie(key) -- Gets a HTTP cookie</pre>
952 <pre class="prettyprint lang-lua">r:setcookie(key, value, secure, expires) -- Sets a HTTP cookie, for instance:
953 r:setcookie("foo", "bar and stuff", false, os.time() + 86400)</pre>
956 <pre class="prettyprint lang-lua">r:wsupgrade() -- Upgrades a connection to WebSockets if possible (and requested):
957 if r:wsupgrade() then -- if we can upgrade:
958 r:wswrite("Welcome to websockets!") -- write something to the client
959 r:wsclose() -- goodbye!
963 <pre class="prettyprint lang-lua">r:wsread() -- Reads a WebSocket frame from a WebSocket upgraded connection (see above):
965 local line, isFinal = r:wsread() -- isFinal denotes whether this is the final frame.
966 -- If it isn't, then more frames can be read
967 r:wswrite("You wrote: " .. line)</pre>
970 <pre class="prettyprint lang-lua">r:wswrite(line) -- Writes a frame to a WebSocket client:
971 r:wswrite("Hello, world!")</pre>
974 <pre class="prettyprint lang-lua">r:wsclose() -- Closes a WebSocket request and terminates it for httpd:
976 if r:wsupgrade() then
977 r:wswrite("Write something: ")
978 local line = r:wsread() or "nothing"
979 r:wswrite("You wrote: " .. line);
980 r:wswrite("Goodbye!")
985 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
986 <div class="section">
987 <h2><a name="logging" id="logging">Logging Functions</a></h2>
989 <pre class="prettyprint lang-lua"> -- examples of logging messages<br />
990 r:trace1("This is a trace log message") -- trace1 through trace8 can be used <br />
991 r:debug("This is a debug log message")<br />
992 r:info("This is an info log message")<br />
993 r:notice("This is a notice log message")<br />
994 r:warn("This is a warn log message")<br />
995 r:err("This is an err log message")<br />
996 r:alert("This is an alert log message")<br />
997 r:crit("This is a crit log message")<br />
998 r:emerg("This is an emerg log message")<br />
1002 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1003 <div class="section">
1004 <h2><a name="apache2" id="apache2">apache2 Package</a></h2>
1005 <p>A package named <code>apache2</code> is available with (at least) the following contents.</p>
1008 <dd>internal constant OK. Handlers should return this if they've
1009 handled the request.</dd>
1010 <dt>apache2.DECLINED</dt>
1011 <dd>internal constant DECLINED. Handlers should return this if
1012 they are not going to handle the request.</dd>
1013 <dt>apache2.DONE</dt>
1014 <dd>internal constant DONE.</dd>
1015 <dt>apache2.version</dt>
1016 <dd>Apache HTTP server version string</dd>
1017 <dt>apache2.HTTP_MOVED_TEMPORARILY</dt>
1018 <dd>HTTP status code</dd>
1019 <dt>apache2.PROXYREQ_NONE, apache2.PROXYREQ_PROXY, apache2.PROXYREQ_REVERSE, apache2.PROXYREQ_RESPONSE</dt>
1020 <dd>internal constants used by <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></dd>
1021 <dt>apache2.AUTHZ_DENIED, apache2.AUTHZ_GRANTED, apache2.AUTHZ_NEUTRAL, apache2.AUTHZ_GENERAL_ERROR, apache2.AUTHZ_DENIED_NO_USER</dt>
1022 <dd>internal constants used by <code class="module"><a href="../mod/mod_authz_core.html">mod_authz_core</a></code></dd>
1025 <p>(Other HTTP status codes are not yet implemented.)</p>
1026 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1027 <div class="section">
1028 <h2><a name="modifying_buckets" id="modifying_buckets">Modifying contents with Lua filters</a></h2>
1031 Filter functions implemented via <code class="directive"><a href="#luainputfilter">LuaInputFilter</a></code>
1032 or <code class="directive"><a href="#luaoutputfilter">LuaOutputFilter</a></code> are designed as
1033 three-stage non-blocking functions using coroutines to suspend and resume a
1034 function as buckets are sent down the filter chain. The core structure of
1037 <pre class="prettyprint lang-lua">function filter(r)
1038 -- Our first yield is to signal that we are ready to receive buckets.
1039 -- Before this yield, we can set up our environment, check for conditions,
1040 -- and, if we deem it necessary, decline filtering a request alltogether:
1041 if something_bad then
1042 return -- This would skip this filter.
1044 -- Regardless of whether we have data to prepend, a yield MUST be called here.
1045 -- Note that only output filters can prepend data. Input filters must use the
1046 -- final stage to append data to the content.
1047 coroutine.yield([optional header to be prepended to the content])
1049 -- After we have yielded, buckets will be sent to us, one by one, and we can
1050 -- do whatever we want with them and then pass on the result.
1051 -- Buckets are stored in the global variable 'bucket', so we create a loop
1052 -- that checks if 'bucket' is not nil:
1053 while bucket ~= nil do
1054 local output = mangle(bucket) -- Do some stuff to the content
1055 coroutine.yield(output) -- Return our new content to the filter chain
1058 -- Once the buckets are gone, 'bucket' is set to nil, which will exit the
1059 -- loop and land us here. Anything extra we want to append to the content
1060 -- can be done by doing a final yield here. Both input and output filters
1061 -- can append data to the content in this phase.
1062 coroutine.yield([optional footer to be appended to the content])
1065 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1066 <div class="section">
1067 <h2><a name="databases" id="databases">Database connectivity</a></h2>
1070 Mod_lua implements a simple database feature for querying and running commands
1071 on the most popular database engines (mySQL, PostgreSQL, FreeTDS, ODBC, SQLite, Oracle)
1074 <p>The example below shows how to acquire a database handle and return information from a table:</p>
1075 <pre class="prettyprint lang-lua">function handle(r)
1076 -- Acquire a database handle
1077 local database, err = r:dbacquire("mysql", "server=localhost,user=someuser,pass=somepass,dbname=mydb")
1079 -- Select some information from it
1080 local results, err = database:select(r, "SELECT `name`, `age` FROM `people` WHERE 1")
1082 local rows = results(0) -- fetch all rows synchronously
1083 for k, row in pairs(rows) do
1084 r:puts( string.format("Name: %s, Age: %s<br/>", row[1], row[2]) )
1087 r:puts("Database query error: " .. err)
1091 r:puts("Could not connect to the database: " .. err)
1096 To utilize <code class="module"><a href="../mod/mod_dbd.html">mod_dbd</a></code>, specify <code>mod_dbd</code>
1097 as the database type, or leave the field blank:
1099 <pre class="prettyprint lang-lua">local database = r:dbacquire("mod_dbd")</pre>
1101 <h3><a name="database_object" id="database_object">Database object and contained functions</a></h3>
1103 <p>The database object returned by <code>dbacquire</code> has the following methods:</p>
1104 <p><strong>Normal select and query from a database:</strong></p>
1105 <pre class="prettyprint lang-lua">-- Run a statement and return the number of rows affected:
1106 local affected, errmsg = database:query(r, "DELETE FROM `tbl` WHERE 1")
1108 -- Run a statement and return a result set that can be used synchronously or async:
1109 local result, errmsg = database:select(r, "SELECT * FROM `people` WHERE 1")</pre>
1111 <p><strong>Using prepared statements (recommended):</strong></p>
1112 <pre class="prettyprint lang-lua">-- Create and run a prepared statement:
1113 local statement, errmsg = database:prepare(r, "DELETE FROM `tbl` WHERE `age` > %u")
1115 local result, errmsg = statement:query(20) -- run the statement with age > 20
1118 -- Fetch a prepared statement from a DBDPrepareSQL directive:
1119 local statement, errmsg = database:prepared(r, "someTag")
1121 local result, errmsg = statement:select("John Doe", 123) -- inject the values "John Doe" and 123 into the statement
1124 <p><strong>Escaping values, closing databases etc:</strong></p>
1125 <pre class="prettyprint lang-lua">-- Escape a value for use in a statement:
1126 local escaped = database:escape(r, [["'|blabla]])
1128 -- Close a database connection and free up handles:
1131 -- Check whether a database connection is up and running:
1132 local connected = database:active()</pre>
1135 <h3><a name="result_sets" id="result_sets">Working with result sets</a></h3>
1137 <p>The result set returned by <code>db:select</code> or by the prepared statement functions
1138 created through <code>db:prepare</code> can be used to
1139 fetch rows synchronously or asynchronously, depending on the row number specified:<br />
1140 <code>result(0)</code> fetches all rows in a synchronous manner, returning a table of rows.<br />
1141 <code>result(-1)</code> fetches the next available row in the set, asynchronously.<br />
1142 <code>result(N)</code> fetches row number <code>N</code>, asynchronously:
1144 <pre class="prettyprint lang-lua">-- fetch a result set using a regular query:
1145 local result, err = db:select(r, "SELECT * FROM `tbl` WHERE 1")
1147 local rows = result(0) -- Fetch ALL rows synchronously
1148 local row = result(-1) -- Fetch the next available row, asynchronously
1149 local row = result(1234) -- Fetch row number 1234, asynchronously</pre>
1151 <p>One can construct a function that returns an iterative function to iterate over all rows
1152 in a synchronous or asynchronous way, depending on the async argument:
1154 <pre class="prettyprint lang-lua">function rows(resultset, async)
1156 local function getnext()
1158 local row = resultset(-1)
1159 return row and a or nil, row
1162 return pairs(resultset(0))
1164 return getnext, self
1168 local statement, err = db:prepare(r, "SELECT * FROM `tbl` WHERE `age` > %u")
1170 -- fetch rows asynchronously:
1171 local result, err = statement:select(20)
1173 for index, row in rows(result, true) do
1178 -- fetch rows synchronously:
1179 local result, err = statement:select(20)
1181 for index, row in rows(result, false) do
1188 <h3><a name="closing_databases" id="closing_databases">Closing a database connection</a></h3>
1191 <p>Database handles should be closed using <code>database:close()</code> when they are no longer
1192 needed. If you do not close them manually, they will eventually be garbage collected and
1193 closed by mod_lua, but you may end up having too many unused connections to the database
1194 if you leave the closing up to mod_lua. Essentially, the following two measures are
1197 <pre class="prettyprint lang-lua">-- Method 1: Manually close a handle
1198 local database = r:dbacquire("mod_dbd")
1199 database:close() -- All done
1201 -- Method 2: Letting the garbage collector close it
1202 local database = r:dbacquire("mod_dbd")
1203 database = nil -- throw away the reference
1204 collectgarbage() -- close the handle via GC</pre>
1207 <h3><a name="database_caveat" id="database_caveat">Precautions when working with databases</a></h3>
1209 <p>Although the standard <code>query</code> and <code>run</code> functions are freely
1210 available, it is recommended that you use prepared statements whenever possible, to
1211 both optimize performance (if your db handle lives on for a long time) and to minimize
1212 the risk of SQL injection attacks. <code>run</code> and <code>query</code> should only
1213 be used when there are no variables inserted into a statement (a static statement).
1214 When using dynamic statements, use <code>db:prepare</code> or <code>db:prepared</code>.
1219 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1220 <div class="directive-section"><h2><a name="LuaAuthzProvider" id="LuaAuthzProvider">LuaAuthzProvider</a> <a name="luaauthzprovider" id="luaauthzprovider">Directive</a></h2>
1221 <table class="directive">
1222 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Plug an authorization provider function into <code class="module"><a href="../mod/mod_authz_core.html">mod_authz_core</a></code>
1224 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaAuthzProvider provider_name /path/to/lua/script.lua function_name</code></td></tr>
1225 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
1226 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1227 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1228 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>2.4.3 and later</td></tr>
1230 <p>After a lua function has been registered as authorization provider, it can be used
1231 with the <code class="directive"><a href="../mod/mod_authz_core.html#require">Require</a></code> directive:</p>
1233 <pre class="prettyprint lang-config">LuaRoot /usr/local/apache2/lua
1234 LuaAuthzProvider foo authz.lua authz_check_foo
1237 </Location></pre>
1239 <pre class="prettyprint lang-lua">require "apache2"
1240 function authz_check_foo(r, who)
1241 if r.user ~= who then return apache2.AUTHZ_DENIED
1242 return apache2.AUTHZ_GRANTED
1249 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1250 <div class="directive-section"><h2><a name="LuaCodeCache" id="LuaCodeCache">LuaCodeCache</a> <a name="luacodecache" id="luacodecache">Directive</a></h2>
1251 <table class="directive">
1252 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Configure the compiled code cache.</td></tr>
1253 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaCodeCache stat|forever|never</code></td></tr>
1254 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>LuaCodeCache stat</code></td></tr>
1255 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1256 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1257 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1258 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1260 Specify the behavior of the in-memory code cache. The default
1261 is stat, which stats the top level script (not any included
1262 ones) each time that file is needed, and reloads it if the
1263 modified time indicates it is newer than the one it has
1264 already loaded. The other values cause it to keep the file
1265 cached forever (don't stat and replace) or to never cache the
1268 <p>In general stat or forever is good for production, and stat or never
1269 for development.</p>
1271 <div class="example"><h3>Examples:</h3><pre class="prettyprint lang-config">LuaCodeCache stat
1272 LuaCodeCache forever
1273 LuaCodeCache never</pre>
1278 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1279 <div class="directive-section"><h2><a name="LuaHookAccessChecker" id="LuaHookAccessChecker">LuaHookAccessChecker</a> <a name="luahookaccesschecker" id="luahookaccesschecker">Directive</a></h2>
1280 <table class="directive">
1281 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Provide a hook for the access_checker phase of request processing</td></tr>
1282 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaHookAccessChecker /path/to/lua/script.lua hook_function_name [early|late]</code></td></tr>
1283 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1284 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1285 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1286 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1287 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>The optional third argument is supported in 2.3.15 and later</td></tr>
1289 <p>Add your hook to the access_checker phase. An access checker
1290 hook function usually returns OK, DECLINED, or HTTP_FORBIDDEN.</p>
1291 <div class="note"><h3>Ordering</h3><p>The optional arguments "early" or "late"
1292 control when this script runs relative to other modules.</p></div>
1295 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1296 <div class="directive-section"><h2><a name="LuaHookAuthChecker" id="LuaHookAuthChecker">LuaHookAuthChecker</a> <a name="luahookauthchecker" id="luahookauthchecker">Directive</a></h2>
1297 <table class="directive">
1298 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Provide a hook for the auth_checker phase of request processing</td></tr>
1299 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaHookAuthChecker /path/to/lua/script.lua hook_function_name [early|late]</code></td></tr>
1300 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1301 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1302 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1303 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1304 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>The optional third argument is supported in 2.3.15 and later</td></tr>
1306 <p>Invoke a lua function in the auth_checker phase of processing
1307 a request. This can be used to implement arbitrary authentication
1308 and authorization checking. A very simple example:
1310 <pre class="prettyprint lang-lua">require 'apache2'
1312 -- fake authcheck hook
1313 -- If request has no auth info, set the response header and
1314 -- return a 401 to ask the browser for basic auth info.
1315 -- If request has auth info, don't actually look at it, just
1316 -- pretend we got userid 'foo' and validated it.
1317 -- Then check if the userid is 'foo' and accept the request.
1318 function authcheck_hook(r)
1320 -- look for auth info
1321 auth = r.headers_in['Authorization']
1327 if r.user == nil then
1328 r:debug("authcheck: user is nil, returning 401")
1329 r.err_headers_out['WWW-Authenticate'] = 'Basic realm="WallyWorld"'
1331 elseif r.user == "foo" then
1332 r:debug('user foo: OK')
1334 r:debug("authcheck: user='" .. r.user .. "'")
1335 r.err_headers_out['WWW-Authenticate'] = 'Basic realm="WallyWorld"'
1341 <div class="note"><h3>Ordering</h3><p>The optional arguments "early" or "late"
1342 control when this script runs relative to other modules.</p></div>
1345 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1346 <div class="directive-section"><h2><a name="LuaHookCheckUserID" id="LuaHookCheckUserID">LuaHookCheckUserID</a> <a name="luahookcheckuserid" id="luahookcheckuserid">Directive</a></h2>
1347 <table class="directive">
1348 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Provide a hook for the check_user_id phase of request processing</td></tr>
1349 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaHookCheckUserID /path/to/lua/script.lua hook_function_name [early|late]</code></td></tr>
1350 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1351 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1352 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1353 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1354 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>The optional third argument is supported in 2.3.15 and later</td></tr>
1356 <div class="note"><h3>Ordering</h3><p>The optional arguments "early" or "late"
1357 control when this script runs relative to other modules.</p></div>
1360 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1361 <div class="directive-section"><h2><a name="LuaHookFixups" id="LuaHookFixups">LuaHookFixups</a> <a name="luahookfixups" id="luahookfixups">Directive</a></h2>
1362 <table class="directive">
1363 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Provide a hook for the fixups phase of a request
1364 processing</td></tr>
1365 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaHookFixups /path/to/lua/script.lua hook_function_name</code></td></tr>
1366 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1367 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1368 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1369 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1372 Just like LuaHookTranslateName, but executed at the fixups phase
1376 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1377 <div class="directive-section"><h2><a name="LuaHookInsertFilter" id="LuaHookInsertFilter">LuaHookInsertFilter</a> <a name="luahookinsertfilter" id="luahookinsertfilter">Directive</a></h2>
1378 <table class="directive">
1379 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Provide a hook for the insert_filter phase of request processing</td></tr>
1380 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaHookInsertFilter /path/to/lua/script.lua hook_function_name</code></td></tr>
1381 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1382 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1383 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1384 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1385 </table><p>Not Yet Implemented</p>
1387 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1388 <div class="directive-section"><h2><a name="LuaHookLog" id="LuaHookLog">LuaHookLog</a> <a name="luahooklog" id="luahooklog">Directive</a></h2>
1389 <table class="directive">
1390 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Provide a hook for the access log phase of a request
1391 processing</td></tr>
1392 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaHookLog /path/to/lua/script.lua log_function_name</code></td></tr>
1393 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1394 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1395 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1396 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1399 This simple logging hook allows you to run a function when httpd enters the
1400 logging phase of a request. With it, you can append data to your own logs,
1401 manipulate data before the regular log is written, or prevent a log entry
1402 from being created. To prevent the usual logging from happening, simply return
1403 <code>apache2.DONE</code> in your logging handler, otherwise return
1404 <code>apache2.OK</code> to tell httpd to log as normal.
1407 <pre class="prettyprint lang-config">LuaHookLog /path/to/script.lua logger</pre>
1409 <pre class="prettyprint lang-lua">-- /path/to/script.lua --
1412 -- If 1, then we write to our own Lua log and tell httpd not to log
1414 -- If 2, then we just sanitize the output a bit and tell httpd to
1415 -- log the sanitized bits.
1417 if math.random(1,2) == 1 then
1418 -- Log stuff ourselves and don't log in the regular log
1419 local f = io.open("/foo/secret.log", "a")
1421 f:write("Something secret happened at " .. r.uri .. "\n")
1424 return apache2.DONE -- Tell httpd not to use the regular logging functions
1426 r.uri = r.uri:gsub("somesecretstuff", "") -- sanitize the URI
1427 return apache2.OK -- tell httpd to log it.
1433 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1434 <div class="directive-section"><h2><a name="LuaHookMapToStorage" id="LuaHookMapToStorage">LuaHookMapToStorage</a> <a name="luahookmaptostorage" id="luahookmaptostorage">Directive</a></h2>
1435 <table class="directive">
1436 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Provide a hook for the map_to_storage phase of request processing</td></tr>
1437 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaHookMapToStorage /path/to/lua/script.lua hook_function_name</code></td></tr>
1438 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1439 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1440 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1441 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1443 <p>Like <code class="directive">LuaHookTranslateName</code> but executed at the
1444 map-to-storage phase of a request. Modules like mod_cache run at this phase,
1445 which makes for an interesting example on what to do here:</p>
1446 <pre class="prettyprint lang-config">LuaHookMapToStorage /path/to/lua/script.lua check_cache</pre>
1448 <pre class="prettyprint lang-lua">require"apache2"
1451 function read_file(filename)
1452 local input = io.open(filename, "r")
1454 local data = input:read("*a")
1455 cached_files[filename] = data
1456 file = cached_files[filename]
1459 return cached_files[filename]
1462 function check_cache(r)
1463 if r.filename:match("%.png$") then -- Only match PNG files
1464 local file = cached_files[r.filename] -- Check cache entries
1466 file = read_file(r.filename) -- Read file into cache
1468 if file then -- If file exists, write it out
1471 r:info(("Sent %s to client from cache"):format(r.filename))
1472 return apache2.DONE -- skip default handler for PNG files
1475 return apache2.DECLINED -- If we had nothing to do, let others serve this.
1481 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1482 <div class="directive-section"><h2><a name="LuaHookTranslateName" id="LuaHookTranslateName">LuaHookTranslateName</a> <a name="luahooktranslatename" id="luahooktranslatename">Directive</a></h2>
1483 <table class="directive">
1484 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Provide a hook for the translate name phase of request processing</td></tr>
1485 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaHookTranslateName /path/to/lua/script.lua hook_function_name [early|late]</code></td></tr>
1486 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1487 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1488 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1489 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1490 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>The optional third argument is supported in 2.3.15 and later</td></tr>
1492 Add a hook (at APR_HOOK_MIDDLE) to the translate name phase of
1493 request processing. The hook function receives a single
1494 argument, the request_rec, and should return a status code,
1495 which is either an HTTP error code, or the constants defined
1496 in the apache2 module: apache2.OK, apache2.DECLINED, or
1499 <p>For those new to hooks, basically each hook will be invoked
1500 until one of them returns apache2.OK. If your hook doesn't
1501 want to do the translation it should just return
1502 apache2.DECLINED. If the request should stop processing, then
1503 return apache2.DONE.</p>
1507 <pre class="prettyprint lang-config"># httpd.conf
1508 LuaHookTranslateName /scripts/conf/hooks.lua silly_mapper</pre>
1511 <pre class="prettyprint lang-lua">-- /scripts/conf/hooks.lua --
1513 function silly_mapper(r)
1514 if r.uri == "/" then
1515 r.filename = "/var/www/home.lua"
1518 return apache2.DECLINED
1523 <div class="note"><h3>Context</h3><p>This directive is not valid in <code class="directive"><a href="../mod/core.html#directory"><Directory></a></code>, <code class="directive"><a href="../mod/core.html#files"><Files></a></code>, or htaccess
1526 <div class="note"><h3>Ordering</h3><p>The optional arguments "early" or "late"
1527 control when this script runs relative to other modules.</p></div>
1531 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1532 <div class="directive-section"><h2><a name="LuaHookTypeChecker" id="LuaHookTypeChecker">LuaHookTypeChecker</a> <a name="luahooktypechecker" id="luahooktypechecker">Directive</a></h2>
1533 <table class="directive">
1534 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Provide a hook for the type_checker phase of request processing</td></tr>
1535 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaHookTypeChecker /path/to/lua/script.lua hook_function_name</code></td></tr>
1536 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1537 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1538 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1539 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1541 This directive provides a hook for the type_checker phase of the request processing.
1542 This phase is where requests are assigned a content type and a handler, and thus can
1543 be used to modify the type and handler based on input:
1545 <pre class="prettyprint lang-config">LuaHookTypeChecker /path/to/lua/script.lua type_checker</pre>
1547 <pre class="prettyprint lang-lua"> function type_checker(r)
1548 if r.uri:match("%.to_gif$") then -- match foo.png.to_gif
1549 r.content_type = "image/gif" -- assign it the image/gif type
1550 r.handler = "gifWizard" -- tell the gifWizard module to handle this
1551 r.filename = r.uri:gsub("%.to_gif$", "") -- fix the filename requested
1555 return apache2.DECLINED
1560 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1561 <div class="directive-section"><h2><a name="LuaInherit" id="LuaInherit">LuaInherit</a> <a name="luainherit" id="luainherit">Directive</a></h2>
1562 <table class="directive">
1563 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Controls how parent configuration sections are merged into children</td></tr>
1564 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaInherit none|parent-first|parent-last</code></td></tr>
1565 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>LuaInherit parent-first</code></td></tr>
1566 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1567 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1568 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1569 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1570 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>2.4.0 and later</td></tr>
1571 </table><p>By default, if LuaHook* directives are used in overlapping
1572 Directory or Location configuration sections, the scripts defined in the
1573 more specific section are run <em>after</em> those defined in the more
1574 generic section (LuaInherit parent-first). You can reverse this order, or
1575 make the parent context not apply at all.</p>
1577 <p> In previous 2.3.x releases, the default was effectively to ignore LuaHook*
1578 directives from parent configuration sections.</p>
1580 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1581 <div class="directive-section"><h2><a name="LuaInputFilter" id="LuaInputFilter">LuaInputFilter</a> <a name="luainputfilter" id="luainputfilter">Directive</a></h2>
1582 <table class="directive">
1583 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Provide a Lua function for content input filtering</td></tr>
1584 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaInputFilter filter_name /path/to/lua/script.lua function_name</code></td></tr>
1585 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
1586 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1587 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1588 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>2.5.0 and later</td></tr>
1590 <p>Provides a means of adding a Lua function as an input filter.
1591 As with output filters, input filters work as coroutines,
1592 first yielding before buffers are sent, then yielding whenever
1593 a bucket needs to be passed down the chain, and finally (optionally)
1594 yielding anything that needs to be appended to the input data. The
1595 global variable <code>bucket</code> holds the buckets as they are passed
1596 onto the Lua script:
1599 <pre class="prettyprint lang-config">LuaInputFilter myInputFilter /www/filter.lua input_filter
1600 <FilesMatch "\.lua>
1601 SetInputFilter myInputFilter
1602 </FilesMatch></pre>
1604 <pre class="prettyprint lang-lua">--[[
1605 Example input filter that converts all POST data to uppercase.
1607 function input_filter(r)
1608 print("luaInputFilter called") -- debug print
1609 coroutine.yield() -- Yield and wait for buckets
1610 while bucket do -- For each bucket, do...
1611 local output = string.upper(bucket) -- Convert all POST data to uppercase
1612 coroutine.yield(output) -- Send converted data down the chain
1614 -- No more buckets available.
1615 coroutine.yield("&filterSignature=1234") -- Append signature at the end
1619 The input filter supports denying/skipping a filter if it is deemed unwanted:
1621 <pre class="prettyprint lang-lua">function input_filter(r)
1623 return -- Simply deny filtering, passing on the original content instead
1625 coroutine.yield() -- wait for buckets
1626 ... -- insert filter stuff here
1630 See "<a href="#modifying_buckets">Modifying contents with Lua
1631 filters</a>" for more information.
1635 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1636 <div class="directive-section"><h2><a name="LuaMapHandler" id="LuaMapHandler">LuaMapHandler</a> <a name="luamaphandler" id="luamaphandler">Directive</a></h2>
1637 <table class="directive">
1638 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Map a path to a lua handler</td></tr>
1639 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaMapHandler uri-pattern /path/to/lua/script.lua [function-name]</code></td></tr>
1640 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1641 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1642 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1643 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1645 <p>This directive matches a uri pattern to invoke a specific
1646 handler function in a specific file. It uses PCRE regular
1647 expressions to match the uri, and supports interpolating
1648 match groups into both the file path and the function name.
1649 Be careful writing your regular expressions to avoid security
1651 <div class="example"><h3>Examples:</h3><pre class="prettyprint lang-config">LuaMapHandler /(\w+)/(\w+) /scripts/$1.lua handle_$2</pre>
1653 <p>This would match uri's such as /photos/show?id=9
1654 to the file /scripts/photos.lua and invoke the
1655 handler function handle_show on the lua vm after
1656 loading that file.</p>
1658 <pre class="prettyprint lang-config">LuaMapHandler /bingo /scripts/wombat.lua</pre>
1660 <p>This would invoke the "handle" function, which
1661 is the default if no specific function name is
1665 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1666 <div class="directive-section"><h2><a name="LuaOutputFilter" id="LuaOutputFilter">LuaOutputFilter</a> <a name="luaoutputfilter" id="luaoutputfilter">Directive</a></h2>
1667 <table class="directive">
1668 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Provide a Lua function for content output filtering</td></tr>
1669 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaOutputFilter filter_name /path/to/lua/script.lua function_name</code></td></tr>
1670 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
1671 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1672 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1673 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>2.5.0 and later</td></tr>
1675 <p>Provides a means of adding a Lua function as an output filter.
1676 As with input filters, output filters work as coroutines,
1677 first yielding before buffers are sent, then yielding whenever
1678 a bucket needs to be passed down the chain, and finally (optionally)
1679 yielding anything that needs to be appended to the input data. The
1680 global variable <code>bucket</code> holds the buckets as they are passed
1681 onto the Lua script:
1684 <pre class="prettyprint lang-config">LuaOutputFilter myOutputFilter /www/filter.lua output_filter
1685 <FilesMatch "\.lua>
1686 SetOutputFilter myOutputFilter
1687 </FilesMatch></pre>
1689 <pre class="prettyprint lang-lua">--[[
1690 Example output filter that escapes all HTML entities in the output
1692 function output_filter(r)
1693 coroutine.yield("(Handled by myOutputFilter)<br/>\n") -- Prepend some data to the output,
1694 -- yield and wait for buckets.
1695 while bucket do -- For each bucket, do...
1696 local output = r:escape_html(bucket) -- Escape all output
1697 coroutine.yield(output) -- Send converted data down the chain
1699 -- No more buckets available.
1703 As with the input filter, the output filter supports denying/skipping a filter
1704 if it is deemed unwanted:
1706 <pre class="prettyprint lang-lua">function output_filter(r)
1707 if not r.content_type:match("text/html") then
1708 return -- Simply deny filtering, passing on the original content instead
1710 coroutine.yield() -- wait for buckets
1711 ... -- insert filter stuff here
1714 <div class="note"><h3>Lua filters with <code class="module"><a href="../mod/mod_filter.html">mod_filter</a></code></h3>
1715 <p> When a Lua filter is used as the underlying provider via the
1716 <code class="directive"><a href="../mod/mod_filter.html#filterprovider">FilterProvider</a></code> directive, filtering
1717 will only work when the <var>filter-name</var> is identical to the <var>provider-name</var>.
1721 See "<a href="#modifying_buckets">Modifying contents with Lua filters</a>" for more
1727 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1728 <div class="directive-section"><h2><a name="LuaPackageCPath" id="LuaPackageCPath">LuaPackageCPath</a> <a name="luapackagecpath" id="luapackagecpath">Directive</a></h2>
1729 <table class="directive">
1730 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Add a directory to lua's package.cpath</td></tr>
1731 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaPackageCPath /path/to/include/?.soa</code></td></tr>
1732 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1733 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1734 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1735 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1737 <p>Add a path to lua's shared library search path. Follows the same
1738 conventions as lua. This just munges the package.cpath in the
1743 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1744 <div class="directive-section"><h2><a name="LuaPackagePath" id="LuaPackagePath">LuaPackagePath</a> <a name="luapackagepath" id="luapackagepath">Directive</a></h2>
1745 <table class="directive">
1746 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Add a directory to lua's package.path</td></tr>
1747 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaPackagePath /path/to/include/?.lua</code></td></tr>
1748 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1749 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1750 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1751 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1752 </table><p>Add a path to lua's module search path. Follows the same
1753 conventions as lua. This just munges the package.path in the
1756 <div class="example"><h3>Examples:</h3><pre class="prettyprint lang-config">LuaPackagePath /scripts/lib/?.lua
1757 LuaPackagePath /scripts/lib/?/init.lua</pre>
1761 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1762 <div class="directive-section"><h2><a name="LuaQuickHandler" id="LuaQuickHandler">LuaQuickHandler</a> <a name="luaquickhandler" id="luaquickhandler">Directive</a></h2>
1763 <table class="directive">
1764 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Provide a hook for the quick handler of request processing</td></tr>
1765 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaQuickHandler /path/to/script.lua hook_function_name</code></td></tr>
1766 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1767 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1768 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1769 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1772 This phase is run immediately after the request has been mapped to a virtal host,
1773 and can be used to either do some request processing before the other phases kick
1774 in, or to serve a request without the need to translate, map to storage et cetera.
1775 As this phase is run before anything else, directives such as <code class="directive"><a href="../mod/core.html#location"><Location></a></code> or <code class="directive"><a href="../mod/core.html#directory"><Directory></a></code> are void in this phase, just as
1776 URIs have not been properly parsed yet.
1778 <div class="note"><h3>Context</h3><p>This directive is not valid in <code class="directive"><a href="../mod/core.html#directory"><Directory></a></code>, <code class="directive"><a href="../mod/core.html#files"><Files></a></code>, or htaccess
1782 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1783 <div class="directive-section"><h2><a name="LuaRoot" id="LuaRoot">LuaRoot</a> <a name="luaroot" id="luaroot">Directive</a></h2>
1784 <table class="directive">
1785 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Specify the base path for resolving relative paths for mod_lua directives</td></tr>
1786 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaRoot /path/to/a/directory</code></td></tr>
1787 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1788 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1789 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1790 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1792 <p>Specify the base path which will be used to evaluate all
1793 relative paths within mod_lua. If not specified they
1794 will be resolved relative to the current working directory,
1795 which may not always work well for a server.</p>
1798 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1799 <div class="directive-section"><h2><a name="LuaScope" id="LuaScope">LuaScope</a> <a name="luascope" id="luascope">Directive</a></h2>
1800 <table class="directive">
1801 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>One of once, request, conn, thread -- default is once</td></tr>
1802 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaScope once|request|conn|thread|server [min] [max]</code></td></tr>
1803 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>LuaScope once</code></td></tr>
1804 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1805 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1806 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1807 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1809 <p>Specify the life cycle scope of the Lua interpreter which will
1810 be used by handlers in this "Directory." The default is "once"</p>
1813 <dt>once:</dt> <dd>use the interpreter once and throw it away.</dd>
1815 <dt>request:</dt> <dd>use the interpreter to handle anything based on
1816 the same file within this request, which is also
1817 request scoped.</dd>
1819 <dt>conn:</dt> <dd>Same as request but attached to the connection_rec</dd>
1821 <dt>thread:</dt> <dd>Use the interpreter for the lifetime of the thread
1822 handling the request (only available with threaded MPMs).</dd>
1824 <dt>server:</dt> <dd>This one is different than others because the
1825 server scope is quite long lived, and multiple threads
1826 will have the same server_rec. To accommodate this,
1827 server scoped Lua states are stored in an apr
1828 resource list. The <code>min</code> and <code>max</code> arguments
1829 specify the minimum and maximum number of Lua states to keep in the
1833 Generally speaking, the <code>thread</code> and <code>server</code> scopes
1834 execute roughly 2-3 times faster than the rest, because they don't have to
1835 spawn new Lua states on every request (especially with the event MPM, as
1836 even keepalive requests will use a new thread for each request). If you are
1837 satisfied that your scripts will not have problems reusing a state, then
1838 the <code>thread</code> or <code>server</code> scopes should be used for
1839 maximum performance. While the <code>thread</code> scope will provide the
1840 fastest responses, the <code>server</code> scope will use less memory, as
1841 states are pooled, allowing f.x. 1000 threads to share only 100 Lua states,
1842 thus using only 10% of the memory required by the <code>thread</code> scope.
1847 <div class="bottomlang">
1848 <p><span>Available Languages: </span><a href="../en/mod/mod_lua.html" title="English"> en </a> |
1849 <a href="../fr/mod/mod_lua.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
1850 </div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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