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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">
104 LoadModule lua_module modules/mod_lua.so
109 <code>mod_lua</code> provides a handler named <code>lua-script</code>,
110 which can be used with an <code>AddHandler</code> directive:</p>
112 <pre class="prettyprint lang-config">
113 AddHandler lua-script .lua
118 This will cause <code>mod_lua</code> to handle requests for files
119 ending in <code>.lua</code> by invoking that file's
120 <code>handle</code> function.
123 <p>For more flexibility, see <code class="directive">LuaMapHandler</code>.
126 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
127 <div class="section">
128 <h2><a name="writinghandlers" id="writinghandlers">Writing Handlers</a></h2>
129 <p> In the Apache HTTP Server API, the handler is a specific kind of hook
130 responsible for generating the response. Examples of modules that include a
131 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>,
132 and <code class="module"><a href="../mod/mod_status.html">mod_status</a></code>.</p>
134 <p><code>mod_lua</code> always looks to invoke a Lua function for the handler, rather than
135 just evaluating a script body CGI style. A handler function looks
136 something like this:</p>
139 <pre class="prettyprint lang-lua">
140 <strong>example.lua</strong><br />
146 This is the default method name for Lua handlers, see the optional
147 function-name in the LuaMapHandler directive to choose a different
151 r.content_type = "text/plain"
153 if r.method == 'GET' then
154 r:puts("Hello Lua World!\n")
155 for k, v in pairs( r:parseargs() ) do
156 r:puts( string.format("%s: %s\n", k, v) )
158 elseif r.method == 'POST' then
159 r:puts("Hello Lua World!\n")
160 for k, v in pairs( r:parsebody() ) do
161 r:puts( string.format("%s: %s\n", k, v) )
163 elseif r.method == 'PUT' then
164 -- use our own Error contents
165 r:puts("Unsupported HTTP method " .. r.method)
169 -- use the ErrorDocument
178 This handler function just prints out the uri or form encoded
179 arguments to a plaintext page.
183 This means (and in fact encourages) that you can have multiple
184 handlers (or hooks, or filters) in the same script.
187 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
188 <div class="section">
189 <h2><a name="writingauthzproviders" id="writingauthzproviders">Writing Authorization Providers</a></h2>
192 <p><code class="module"><a href="../mod/mod_authz_core.html">mod_authz_core</a></code> provides a high-level interface to
193 authorization that is much easier to use than using into the relevant
194 hooks directly. The first argument to the
195 <code class="directive"><a href="../mod/mod_authz_core.html#require">Require</a></code> directive gives
196 the name of the responsible authorization provider. For any
197 <code class="directive"><a href="../mod/mod_authz_core.html#require">Require</a></code> line,
198 <code class="module"><a href="../mod/mod_authz_core.html">mod_authz_core</a></code> will call the authorization provider
199 of the given name, passing the rest of the line as parameters. The
200 provider will then check authorization and pass the result as return
203 <p>The authz provider is normally called before authentication. If it needs to
204 know the authenticated user name (or if the user will be authenticated at
205 all), the provider must return <code>apache2.AUTHZ_DENIED_NO_USER</code>.
206 This will cause authentication to proceed and the authz provider to be
207 called a second time.</p>
209 <p>The following authz provider function takes two arguments, one ip
210 address and one user name. It will allow access from the given ip address
211 without authentication, or if the authenticated user matches the second
214 <pre class="prettyprint lang-lua">
215 <strong>authz_provider.lua</strong><br />
219 function authz_check_foo(r, ip, user)
220 if r.useragent_ip == ip then
221 return apache2.AUTHZ_GRANTED
222 elseif r.user == nil then
223 return apache2.AUTHZ_DENIED_NO_USER
224 elseif r.user == user then
225 return apache2.AUTHZ_GRANTED
227 return apache2.AUTHZ_DENIED
233 <p>The following configuration registers this function as provider
234 <code>foo</code> and configures it for URL <code>/</code>:</p>
235 <pre class="prettyprint lang-config">
236 LuaAuthzProvider foo authz_provider.lua authz_check_foo
238 Require foo 10.1.2.3 john_doe
243 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
244 <div class="section">
245 <h2><a name="writinghooks" id="writinghooks">Writing Hooks</a></h2>
247 <p>Hook functions are how modules (and Lua scripts) participate in the
248 processing of requests. Each type of hook exposed by the server exists for
249 a specific purpose, such as mapping requests to the file system,
250 performing access control, or setting mime types:</p>
252 <table class="bordered"><tr class="header">
254 <th>mod_lua directive</th>
258 <td>Quick handler</td>
259 <td><code class="directive"><a href="#luaquickhandler">LuaQuickHandler</a></code></td>
260 <td>This is the first hook that will be called after a request has
261 been mapped to a host or virtual host</td>
264 <td>Translate name</td>
265 <td><code class="directive"><a href="#luahooktranslatename">LuaHookTranslateName</a></code></td>
266 <td>This phase translates the requested URI into a filename on the
267 system. Modules such as <code class="module"><a href="../mod/mod_alias.html">mod_alias</a></code> and
268 <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> operate in this phase.</td>
271 <td>Map to storage</td>
272 <td><code class="directive"><a href="#luahookmaptostorage">LuaHookMapToStorage</a></code></td>
273 <td>This phase maps files to their physical, cached or external/proxied storage.
274 It can be used by proxy or caching modules</td>
277 <td>Check Access</td>
278 <td><code class="directive"><a href="#luahookaccesschecker">LuaHookAccessChecker</a></code></td>
279 <td>This phase checks whether a client has access to a resource. This
280 phase is run before the user is authenticated, so beware.
284 <td>Check User ID</td>
285 <td><code class="directive"><a href="#luahookcheckuserid">LuaHookCheckUserID</a></code></td>
286 <td>This phase it used to check the negotiated user ID</td>
289 <td>Check Authorization</td>
290 <td><code class="directive"><a href="#luahookauthchecker">LuaHookAuthChecker</a></code> or
291 <code class="directive"><a href="#luaauthzprovider">LuaAuthzProvider</a></code></td>
292 <td>This phase authorizes a user based on the negotiated credentials, such as
293 user ID, client certificate etc.
298 <td><code class="directive"><a href="#luahooktypechecker">LuaHookTypeChecker</a></code></td>
299 <td>This phase checks the requested file and assigns a content type and
304 <td><code class="directive"><a href="#luahookfixups">LuaHookFixups</a></code></td>
305 <td>This is the final "fix anything" phase before the content handlers
306 are run. Any last-minute changes to the request should be made here.</td>
309 <td>Content handler</td>
310 <td>fx. <code>.lua</code> files or through <code class="directive"><a href="#luamaphandler">LuaMapHandler</a></code></td>
311 <td>This is where the content is handled. Files are read, parsed, some are run,
312 and the result is sent to the client</td>
316 <td><code class="directive"><a href="#luahooklog">LuaHookLog</a></code></td>
317 <td>Once a request has been handled, it enters several logging phases,
318 which logs the request in either the error or access log. Mod_lua
319 is able to hook into the start of this and control logging output.</td>
323 <p>Hook functions are passed the request object as their only argument
324 (except for LuaAuthzProvider, which also gets passed the arguments from
325 the Require directive).
326 They can return any value, depending on the hook, but most commonly
327 they'll return OK, DONE, or DECLINED, which you can write in Lua as
328 <code>apache2.OK</code>, <code>apache2.DONE</code>, or
329 <code>apache2.DECLINED</code>, or else an HTTP status code.</p>
332 <pre class="prettyprint lang-lua">
333 <strong>translate_name.lua</strong><br />
334 -- example hook that rewrites the URI to a filesystem path.
338 function translate_name(r)
339 if r.uri == "/translate-name" then
340 r.filename = r.document_root .. "/find_me.txt"
343 -- we don't care about this URL, give another module a chance
344 return apache2.DECLINED
350 <pre class="prettyprint lang-lua">
351 <strong>translate_name2.lua</strong><br />
352 --[[ example hook that rewrites one URI to another URI. It returns a
353 apache2.DECLINED to give other URL mappers a chance to work on the
354 substitution, including the core translate_name hook which maps based
357 Note: Use the early/late flags in the directive to make it run before
363 function translate_name(r)
364 if r.uri == "/translate-name" then
365 r.uri = "/find_me.txt"
366 return apache2.DECLINED
368 return apache2.DECLINED
372 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
373 <div class="section">
374 <h2><a name="datastructures" id="datastructures">Data Structures</a></h2>
379 <p>The request_rec is mapped in as a userdata. It has a metatable
380 which lets you do useful things with it. For the most part it
381 has the same fields as the request_rec struct, many of which are writable as
382 well as readable. (The table fields' content can be changed, but the
383 fields themselves cannot be set to different tables.)</p>
385 <table class="bordered"><tr class="header">
386 <th><strong>Name</strong></th>
387 <th><strong>Lua type</strong></th>
388 <th><strong>Writable</strong></th>
389 <th><strong>Description</strong></th>
392 <td><code>allowoverrides</code></td>
395 <td>The AllowOverride options applied to the current request.</td>
398 <td><code>ap_auth_type</code></td>
401 <td>If an authentication check was made, this is set to the type
402 of authentication (f.x. <code>basic</code>)</td>
405 <td><code>args</code></td>
408 <td>The query string arguments extracted from the request
409 (f.x. <code>foo=bar&name=johnsmith</code>)</td>
412 <td><code>assbackwards</code></td>
415 <td>Set to true if this is an HTTP/0.9 style request
416 (e.g. <code>GET /foo</code> (with no headers) )</td>
419 <td><code>auth_name</code></td>
422 <td>The realm name used for authorization (if applicable).</td>
425 <td><code>banner</code></td>
428 <td>The server banner, f.x. <code>Apache HTTP Server/2.4.3 openssl/0.9.8c</code></td>
431 <td><code>basic_auth_pw</code></td>
434 <td>The basic auth password sent with this request, if any</td>
437 <td><code>canonical_filename</code></td>
440 <td>The canonical filename of the request</td>
443 <td><code>content_encoding</code></td>
446 <td>The content encoding of the current request</td>
449 <td><code>content_type</code></td>
452 <td>The content type of the current request, as determined in the
453 type_check phase (f.x. <code>image/gif</code> or <code>text/html</code>)</td>
456 <td><code>context_prefix</code></td>
462 <td><code>context_document_root</code></td>
468 <td><code>document_root</code></td>
471 <td>The document root of the host</td>
474 <td><code>err_headers_out</code></td>
477 <td>MIME header environment for the response, printed even on errors and
478 persist across internal redirects</td>
481 <td><code>filename</code></td>
484 <td>The file name that the request maps to, f.x. /www/example.com/foo.txt. This can be
485 changed in the translate-name or map-to-storage phases of a request to allow the
486 default handler (or script handlers) to serve a different file than what was requested.</td>
489 <td><code>handler</code></td>
492 <td>The name of the <a href="../handler.html">handler</a> that should serve this request, f.x.
493 <code>lua-script</code> if it is to be served by mod_lua. This is typically set by the
494 <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>
495 directives, but could also be set via mod_lua to allow another handler to serve up a specific request
496 that would otherwise not be served by it.
500 <td><code>headers_in</code></td>
503 <td>MIME header environment from the request. This contains headers such as <code>Host,
504 User-Agent, Referer</code> and so on.</td>
507 <td><code>headers_out</code></td>
510 <td>MIME header environment for the response.</td>
513 <td><code>hostname</code></td>
516 <td>The host name, as set by the <code>Host:</code> header or by a full URI.</td>
519 <td><code>is_https</code></td>
522 <td>Whether or not this request is done via HTTPS</td>
525 <td><code>is_initial_req</code></td>
528 <td>Whether this request is the initial request or a sub-request</td>
531 <td><code>limit_req_body</code></td>
534 <td>The size limit of the request body for this request, or 0 if no limit.</td>
537 <td><code>log_id</code></td>
540 <td>The ID to identify request in access and error log.</td>
543 <td><code>method</code></td>
546 <td>The request method, f.x. <code>GET</code> or <code>POST</code>.</td>
549 <td><code>notes</code></td>
552 <td>A list of notes that can be passed on from one module to another.</td>
555 <td><code>options</code></td>
558 <td>The Options directive applied to the current request.</td>
561 <td><code>path_info</code></td>
564 <td>The PATH_INFO extracted from this request.</td>
567 <td><code>port</code></td>
570 <td>The server port used by the request.</td>
573 <td><code>protocol</code></td>
576 <td>The protocol used, f.x. <code>HTTP/1.1</code></td>
579 <td><code>proxyreq</code></td>
582 <td>Denotes whether this is a proxy request or not. This value is generally set in
583 the post_read_request/translate_name phase of a request.</td>
586 <td><code>range</code></td>
589 <td>The contents of the <code>Range:</code> header.</td>
592 <td><code>remaining</code></td>
595 <td>The number of bytes remaining to be read from the request body.</td>
598 <td><code>server_built</code></td>
601 <td>The time the server executable was built.</td>
604 <td><code>server_name</code></td>
607 <td>The server name for this request.</td>
610 <td><code>some_auth_required</code></td>
613 <td>Whether some authorization is/was required for this request.</td>
616 <td><code>subprocess_env</code></td>
619 <td>The environment variables set for this request.</td>
622 <td><code>started</code></td>
625 <td>The time the server was (re)started, in seconds since the epoch (Jan 1st, 1970)</td>
628 <td><code>status</code></td>
631 <td>The (current) HTTP return code for this request, f.x. <code>200</code> or <code>404</code>.</td>
634 <td><code>the_request</code></td>
637 <td>The request string as sent by the client, f.x. <code>GET /foo/bar HTTP/1.1</code>.</td>
640 <td><code>unparsed_uri</code></td>
643 <td>The unparsed URI of the request</td>
646 <td><code>uri</code></td>
649 <td>The URI after it has been parsed by httpd</td>
652 <td><code>user</code></td>
655 <td>If an authentication check has been made, this is set to the name of the authenticated user.</td>
658 <td><code>useragent_ip</code></td>
661 <td>The IP of the user agent making the request</td>
666 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
667 <div class="section">
668 <h2><a name="functions" id="functions">Built in functions</a></h2>
670 <p>The request_rec object has (at least) the following methods:</p>
672 <pre class="prettyprint lang-lua">
673 r:flush() -- flushes the output buffer.
674 -- Returns true if the flush was successful, false otherwise.
676 while we_have_stuff_to_send do
677 r:puts("Bla bla bla\n") -- print something to client
678 r:flush() -- flush the buffer (send to client)
679 r.usleep(500000) -- fake processing time for 0.5 sec. and repeat
684 <pre class="prettyprint lang-lua">
685 r:addoutputfilter(name|function) -- add an output filter:
687 r:addoutputfilter("fooFilter") -- add the fooFilter to the output stream
691 <pre class="prettyprint lang-lua">
692 r:sendfile(filename) -- sends an entire file to the client, using sendfile if supported by the current platform:
694 if use_sendfile_thing then
695 r:sendfile("/var/www/large_file.img")
700 <pre class="prettyprint lang-lua">
701 r:parseargs() -- returns two tables; one standard key/value table for regular GET data,
702 -- and one for multi-value data (fx. foo=1&foo=2&foo=3):
704 local GET, GETMULTI = r:parseargs()
705 r:puts("Your name is: " .. GET['name'] or "Unknown")
709 <pre class="prettyprint lang-lua">
710 r:parsebody([sizeLimit]) -- parse the request body as a POST and return two lua tables,
711 -- just like r:parseargs().
712 -- An optional number may be passed to specify the maximum number
713 -- of bytes to parse. Default is 8192 bytes:
715 local POST, POSTMULTI = r:parsebody(1024*1024)
716 r:puts("Your name is: " .. POST['name'] or "Unknown")
720 <pre class="prettyprint lang-lua">
721 r:puts("hello", " world", "!") -- print to response body, self explanatory
725 <pre class="prettyprint lang-lua">
726 r:write("a single string") -- print to response body, self explanatory
730 <pre class="prettyprint lang-lua">
731 r:escape_html("<html>test</html>") -- Escapes HTML code and returns the escaped result
735 <pre class="prettyprint lang-lua">
736 r:base64_encode(string) -- Encodes a string using the Base64 encoding standard:
738 local encoded = r:base64_encode("This is a test") -- returns VGhpcyBpcyBhIHRlc3Q=
742 <pre class="prettyprint lang-lua">
743 r:base64_decode(string) -- Decodes a Base64-encoded string:
745 local decoded = r:base64_decode("VGhpcyBpcyBhIHRlc3Q=") -- returns 'This is a test'
749 <pre class="prettyprint lang-lua">
750 r:md5(string) -- Calculates and returns the MD5 digest of a string (binary safe):
752 local hash = r:md5("This is a test") -- returns ce114e4501d2f4e2dcea3e17b546f339
756 <pre class="prettyprint lang-lua">
757 r:sha1(string) -- Calculates and returns the SHA1 digest of a string (binary safe):
759 local hash = r:sha1("This is a test") -- returns a54d88e06612d820bc3be72877c74f257b561b19
763 <pre class="prettyprint lang-lua">
764 r:escape(string) -- URL-Escapes a string:
766 local url = "http://foo.bar/1 2 3 & 4 + 5"
767 local escaped = r:escape(url) -- returns 'http%3a%2f%2ffoo.bar%2f1+2+3+%26+4+%2b+5'
771 <pre class="prettyprint lang-lua">
772 r:unescape(string) -- Unescapes an URL-escaped string:
774 local url = "http%3a%2f%2ffoo.bar%2f1+2+3+%26+4+%2b+5"
775 local unescaped = r:unescape(url) -- returns 'http://foo.bar/1 2 3 & 4 + 5'
779 <pre class="prettyprint lang-lua">
780 r:construct_url(string) -- Constructs an URL from an URI
782 local url = r:construct_url(r.uri)
786 <pre class="prettyprint lang-lua">
787 r.mpm_query(number) -- Queries the server for MPM information using ap_mpm_query:
789 local mpm = r.mpm_query(14)
791 r:puts("This server uses the Event MPM")
796 <pre class="prettyprint lang-lua">
797 r:expr(string) -- Evaluates an <a href="../expr.html">expr</a> string.
799 if r:expr("%{HTTP_HOST} =~ /^www/") then
800 r:puts("This host name starts with www")
805 <pre class="prettyprint lang-lua">
806 r:scoreboard_process(a) -- Queries the server for information about the process at position <code>a</code>:
808 local process = r:scoreboard_process(1)
809 r:puts("Server 1 has PID " .. process.pid)
813 <pre class="prettyprint lang-lua">
814 r:scoreboard_worker(a, b) -- Queries for information about the worker thread, <code>b</code>, in process <code>a</code>:
816 local thread = r:scoreboard_worker(1, 1)
817 r:puts("Server 1's thread 1 has thread ID " .. thread.tid .. " and is in " .. thread.status .. " status")
822 <pre class="prettyprint lang-lua">
823 r:clock() -- Returns the current time with microsecond precision
827 <pre class="prettyprint lang-lua">
828 r:requestbody(filename) -- Reads and returns the request body of a request.
829 -- If 'filename' is specified, it instead saves the
830 -- contents to that file:
832 local input = r:requestbody()
833 r:puts("You sent the following request body to me:\n")
838 <pre class="prettyprint lang-lua">
839 r:add_input_filter(filter_name) -- Adds 'filter_name' as an input filter
843 <pre class="prettyprint lang-lua">
844 r.module_info(module_name) -- Queries the server for information about a module
846 local mod = r.module_info("mod_lua.c")
848 for k, v in pairs(mod.commands) do
849 r:puts( ("%s: %s\n"):format(k,v)) -- print out all directives accepted by this module
855 <pre class="prettyprint lang-lua">
856 r:loaded_modules() -- Returns a list of modules loaded by httpd:
858 for k, module in pairs(r:loaded_modules()) do
859 r:puts("I have loaded module " .. module .. "\n")
864 <pre class="prettyprint lang-lua">
865 r:runtime_dir_relative(filename) -- Compute the name of a run-time file (e.g., shared memory "file")
866 -- relative to the appropriate run-time directory.
870 <pre class="prettyprint lang-lua">
871 r:server_info() -- Returns a table containing server information, such as
872 -- the name of the httpd executable file, mpm used etc.
876 <pre class="prettyprint lang-lua">
877 r:set_document_root(file_path) -- Sets the document root for the request to file_path
883 <pre class="prettyprint lang-lua">
884 r:set_context_info(prefix, docroot) -- Sets the context prefix and context document root for a request
888 <pre class="prettyprint lang-lua">
889 r:os_escape_path(file_path) -- Converts an OS path to a URL in an OS dependent way
893 <pre class="prettyprint lang-lua">
894 r:escape_logitem(string) -- Escapes a string for logging
898 <pre class="prettyprint lang-lua">
899 r.strcmp_match(string, pattern) -- Checks if 'string' matches 'pattern' using strcmp_match (globs).
900 -- fx. whether 'www.example.com' matches '*.example.com':
902 local match = r.strcmp_match("foobar.com", "foo*.com")
904 r:puts("foobar.com matches foo*.com")
909 <pre class="prettyprint lang-lua">
910 r:set_keepalive() -- Sets the keepalive status for a request. Returns true if possible, false otherwise.
914 <pre class="prettyprint lang-lua">
915 r:make_etag() -- Constructs and returns the etag for the current request.
919 <pre class="prettyprint lang-lua">
920 r:send_interim_response(clear) -- Sends an interim (1xx) response to the client.
921 -- if 'clear' is true, available headers will be sent and cleared.
925 <pre class="prettyprint lang-lua">
926 r:custom_response(status_code, string) -- Construct and set a custom response for a given status code.
927 -- This works much like the ErrorDocument directive:
929 r:custom_response(404, "Baleted!")
933 <pre class="prettyprint lang-lua">
934 r.exists_config_define(string) -- Checks whether a configuration definition exists or not:
936 if r.exists_config_define("FOO") then
937 r:puts("httpd was probably run with -DFOO, or it was defined in the configuration")
942 <pre class="prettyprint lang-lua">
943 r:state_query(string) -- Queries the server for state information
947 <pre class="prettyprint lang-lua">
948 r:stat(filename [,wanted]) -- Runs stat() on a file, and returns a table with file information:
950 local info = r:stat("/var/www/foo.txt")
952 r:puts("This file exists and was last modified at: " .. info.modified)
957 <pre class="prettyprint lang-lua">
958 r:regex(string, pattern [,flags]) -- Runs a regular expression match on a string, returning captures if matched:
960 local matches = r:regex("foo bar baz", [[foo (\w+) (\S*)]])
962 r:puts("The regex matched, and the last word captured ($2) was: " .. matches[2])
965 -- Example ignoring case sensitivity:
966 local matches = r:regex("FOO bar BAz", [[(foo) bar]], 1)
968 -- Flags can be a bitwise combination of:
970 -- 0x02: Multiline search
974 <pre class="prettyprint lang-lua">
975 r.usleep(number_of_microseconds) -- Puts the script to sleep for a given number of microseconds.
979 <pre class="prettyprint lang-lua">
980 r:dbacquire(dbType[, dbParams]) -- Acquires a connection to a database and returns a database class.
981 -- See '<a href="#databases">Database connectivity</a>' for details.
985 <pre class="prettyprint lang-lua">
986 r:ivm_set("key", value) -- Set an Inter-VM variable to hold a specific value.
987 -- These values persist even though the VM is gone or not being used,
988 -- and so should only be used if MaxConnectionsPerChild is > 0
989 -- Values can be numbers, strings and booleans, and are stored on a
990 -- per process basis (so they won't do much good with a prefork mpm)
992 r:ivm_get("key") -- Fetches a variable set by ivm_set. Returns the contents of the variable
993 -- if it exists or nil if no such variable exists.
995 -- An example getter/setter that saves a global variable outside the VM:
997 -- First VM to call this will get no value, and will have to create it
998 local foo = r:ivm_get("cached_data")
1000 foo = do_some_calcs() -- fake some return value
1001 r:ivm_set("cached_data", foo) -- set it globally
1003 r:puts("Cached data is: ", foo)
1008 <pre class="prettyprint lang-lua">
1009 r:htpassword(string [,algorithm [,cost]]) -- Creates a password hash from a string.
1010 -- algorithm: 0 = APMD5 (default), 1 = SHA, 2 = BCRYPT, 3 = CRYPT.
1011 -- cost: only valid with BCRYPT algorithm (default = 5).
1015 <pre class="prettyprint lang-lua">
1016 r:mkdir(dir [,mode]) -- Creates a directory and sets mode to optional mode paramter.
1020 <pre class="prettyprint lang-lua">
1021 r:mkrdir(dir [,mode]) -- Creates directories recursive and sets mode to optional mode paramter.
1025 <pre class="prettyprint lang-lua">
1026 r:rmdir(dir) -- Removes a directory.
1030 <pre class="prettyprint lang-lua">
1031 r:touch(file [,mtime]) -- Sets the file modification time to current time or to optional mtime msec value.
1035 <pre class="prettyprint lang-lua">
1036 r:get_direntries(dir) -- Returns a table with all directory entries.
1039 local dir = r.context_document_root
1040 for _, f in ipairs(r:get_direntries(dir)) do
1041 local info = r:stat(dir .. "/" .. f)
1043 local mtime = os.date(fmt, info.mtime / 1000000)
1044 local ftype = (info.filetype == 2) and "[dir] " or "[file]"
1045 r:puts( ("%s %s %10i %s\n"):format(ftype, mtime, info.size, f) )
1052 <pre class="prettyprint lang-lua">
1053 r.date_parse_rfc(string) -- Parses a date/time string and returns seconds since epoche.
1057 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1058 <div class="section">
1059 <h2><a name="logging" id="logging">Logging Functions</a></h2>
1061 <pre class="prettyprint lang-lua">
1062 -- examples of logging messages<br />
1063 r:trace1("This is a trace log message") -- trace1 through trace8 can be used <br />
1064 r:debug("This is a debug log message")<br />
1065 r:info("This is an info log message")<br />
1066 r:notice("This is a notice log message")<br />
1067 r:warn("This is a warn log message")<br />
1068 r:err("This is an err log message")<br />
1069 r:alert("This is an alert log message")<br />
1070 r:crit("This is a crit log message")<br />
1071 r:emerg("This is an emerg log message")<br />
1075 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1076 <div class="section">
1077 <h2><a name="apache2" id="apache2">apache2 Package</a></h2>
1078 <p>A package named <code>apache2</code> is available with (at least) the following contents.</p>
1081 <dd>internal constant OK. Handlers should return this if they've
1082 handled the request.</dd>
1083 <dt>apache2.DECLINED</dt>
1084 <dd>internal constant DECLINED. Handlers should return this if
1085 they are not going to handle the request.</dd>
1086 <dt>apache2.DONE</dt>
1087 <dd>internal constant DONE.</dd>
1088 <dt>apache2.version</dt>
1089 <dd>Apache HTTP server version string</dd>
1090 <dt>apache2.HTTP_MOVED_TEMPORARILY</dt>
1091 <dd>HTTP status code</dd>
1092 <dt>apache2.PROXYREQ_NONE, apache2.PROXYREQ_PROXY, apache2.PROXYREQ_REVERSE, apache2.PROXYREQ_RESPONSE</dt>
1093 <dd>internal constants used by <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></dd>
1094 <dt>apache2.AUTHZ_DENIED, apache2.AUTHZ_GRANTED, apache2.AUTHZ_NEUTRAL, apache2.AUTHZ_GENERAL_ERROR, apache2.AUTHZ_DENIED_NO_USER</dt>
1095 <dd>internal constants used by <code class="module"><a href="../mod/mod_authz_core.html">mod_authz_core</a></code></dd>
1098 <p>(Other HTTP status codes are not yet implemented.)</p>
1099 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1100 <div class="section">
1101 <h2><a name="modifying_buckets" id="modifying_buckets">Modifying contents with Lua filters</a></h2>
1104 Filter functions implemented via <code class="directive"><a href="#luainputfilter">LuaInputFilter</a></code>
1105 or <code class="directive"><a href="#luaoutputfilter">LuaOutputFilter</a></code> are designed as
1106 three-stage non-blocking functions using coroutines to suspend and resume a
1107 function as buckets are sent down the filter chain. The core structure of
1110 <pre class="prettyprint lang-lua">
1112 -- Our first yield is to signal that we are ready to receive buckets.
1113 -- Before this yield, we can set up our environment, check for conditions,
1114 -- and, if we deem it necessary, decline filtering a request alltogether:
1115 if something_bad then
1116 return -- This would skip this filter.
1118 -- Regardless of whether we have data to prepend, a yield MUST be called here.
1119 -- Note that only output filters can prepend data. Input filters must use the
1120 -- final stage to append data to the content.
1121 coroutine.yield([optional header to be prepended to the content])
1123 -- After we have yielded, buckets will be sent to us, one by one, and we can
1124 -- do whatever we want with them and then pass on the result.
1125 -- Buckets are stored in the global variable 'bucket', so we create a loop
1126 -- that checks if 'bucket' is not nil:
1127 while bucket ~= nil do
1128 local output = mangle(bucket) -- Do some stuff to the content
1129 coroutine.yield(output) -- Return our new content to the filter chain
1132 -- Once the buckets are gone, 'bucket' is set to nil, which will exit the
1133 -- loop and land us here. Anything extra we want to append to the content
1134 -- can be done by doing a final yield here. Both input and output filters
1135 -- can append data to the content in this phase.
1136 coroutine.yield([optional footer to be appended to the content])
1140 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1141 <div class="section">
1142 <h2><a name="databases" id="databases">Database connectivity</a></h2>
1145 Mod_lua implements a simple database feature for querying and running commands
1146 on the most popular database engines (mySQL, PostgreSQL, FreeTDS, ODBC, SQLite, Oracle)
1149 <p>The example below shows how to acquire a database handle and return information from a table:</p>
1150 <pre class="prettyprint lang-lua">
1152 -- Acquire a database handle
1153 local database, err = r:dbacquire("mysql", "server=localhost,user=root,dbname=mydb")
1155 -- Select some information from it
1156 local results, err = database:select(r, "SELECT `name`, `age` FROM `people` WHERE 1")
1158 local rows = results(0) -- fetch all rows synchronously
1159 for k, row in pairs(rows) do
1160 r:puts( string.format("Name: %s, Age: %s<br/>", row[1], row[2]) )
1163 r:puts("Database query error: " .. err)
1167 r:puts("Could not connect to the database: " .. err)
1173 To utilize <code class="module"><a href="../mod/mod_dbd.html">mod_dbd</a></code>, specify <code>mod_dbd</code>
1174 as the database type, or leave the field blank:
1176 <pre class="prettyprint lang-lua">
1177 local database = r:dbacquire("mod_dbd")
1180 <h3><a name="database_object" id="database_object">Database object and contained functions</a></h3>
1182 <p>The database object returned by <code>dbacquire</code> has the following methods:</p>
1183 <p><strong>Normal select and query from a database:</strong></p>
1184 <pre class="prettyprint lang-lua">
1185 -- Run a statement and return the number of rows affected:
1186 local affected, errmsg = database:query(r, "DELETE FROM `tbl` WHERE 1")
1188 -- Run a statement and return a result set that can be used synchronously or async:
1189 local result, errmsg = database:select(r, "SELECT * FROM `people` WHERE 1")
1192 <p><strong>Using prepared statements (recommended):</strong></p>
1193 <pre class="prettyprint lang-lua">
1194 -- Create and run a prepared statement:
1195 local statement, errmsg = database:prepare(r, "DELETE FROM `tbl` WHERE `age` > %u")
1197 local result, errmsg = statement:query(20) -- run the statement with age > 20
1200 -- Fetch a prepared statement from a DBDPrepareSQL directive:
1201 local statement, errmsg = database:prepared(r, "someTag")
1203 local result, errmsg = statement:select("John Doe", 123) -- inject the values "John Doe" and 123 into the statement
1208 <p><strong>Escaping values, closing databases etc:</strong></p>
1209 <pre class="prettyprint lang-lua">
1210 -- Escape a value for use in a statement:
1211 local escaped = database:escape(r, [["'|blabla]])
1213 -- Close a database connection and free up handles:
1216 -- Check whether a database connection is up and running:
1217 local connected = database:active()
1221 <h3><a name="result_sets" id="result_sets">Working with result sets</a></h3>
1223 <p>The result set returned by <code>db:select</code> or by the prepared statement functions
1224 created through <code>db:prepare</code> can be used to
1225 fetch rows synchronously or asynchronously, depending on the row number specified:<br />
1226 <code>result(0)</code> fetches all rows in a synchronous manner, returning a table of rows.<br />
1227 <code>result(-1)</code> fetches the next available row in the set, asynchronously.<br />
1228 <code>result(N)</code> fetches row number <code>N</code>, asynchronously:
1230 <pre class="prettyprint lang-lua">
1231 -- fetch a result set using a regular query:
1232 local result, err = db:select(r, "SELECT * FROM `tbl` WHERE 1")
1234 local rows = result(0) -- Fetch ALL rows synchronously
1235 local row = result(-1) -- Fetch the next available row, asynchronously
1236 local row = result(1234) -- Fetch row number 1234, asynchronously
1239 <p>One can construct a function that returns an iterative function to iterate over all rows
1240 in a synchronous or asynchronous way, depending on the async argument:
1242 <pre class="prettyprint lang-lua">
1243 function rows(resultset, async)
1245 local function getnext()
1247 local row = resultset(-1)
1248 return row and a or nil, row
1251 return pairs(resultset(0))
1253 return getnext, self
1257 local statement, err = db:prepare(r, "SELECT * FROM `tbl` WHERE `age` > %u")
1259 -- fetch rows asynchronously:
1260 local result, err = statement:select(20)
1262 for index, row in rows(result, true) do
1267 -- fetch rows synchronously:
1268 local result, err = statement:select(20)
1270 for index, row in rows(result, false) do
1278 <h3><a name="closing_databases" id="closing_databases">Closing a database connection</a></h3>
1281 <p>Database handles should be closed using <code>database:close()</code> when they are no longer
1282 needed. If you do not close them manually, they will eventually be garbage collected and
1283 closed by mod_lua, but you may end up having too many unused connections to the database
1284 if you leave the closing up to mod_lua. Essentially, the following two measures are
1287 <pre class="prettyprint lang-lua">
1288 -- Method 1: Manually close a handle
1289 local database = r:dbacquire("mod_dbd")
1290 database:close() -- All done
1292 -- Method 2: Letting the garbage collector close it
1293 local database = r:dbacquire("mod_dbd")
1294 database = nil -- throw away the reference
1295 collectgarbage() -- close the handle via GC
1299 <h3><a name="database_caveat" id="database_caveat">Precautions when working with databases</a></h3>
1301 <p>Although the standard <code>query</code> and <code>run</code> functions are freely
1302 available, it is recommended that you use prepared statements whenever possible, to
1303 both optimize performance (if your db handle lives on for a long time) and to minimize
1304 the risk of SQL injection attacks. <code>run</code> and <code>query</code> should only
1305 be used when there are no variables inserted into a statement (a static statement).
1306 When using dynamic statements, use <code>db:prepare</code> or <code>db:prepared</code>.
1311 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1312 <div class="directive-section"><h2><a name="LuaAuthzProvider" id="LuaAuthzProvider">LuaAuthzProvider</a> <a name="luaauthzprovider" id="luaauthzprovider">Directive</a></h2>
1313 <table class="directive">
1314 <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>
1316 <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>
1317 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
1318 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1319 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1320 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>2.4.3 and later</td></tr>
1322 <p>After a lua function has been registered as authorization provider, it can be used
1323 with the <code class="directive"><a href="../mod/mod_authz_core.html#require">Require</a></code> directive:</p>
1325 <pre class="prettyprint lang-config">
1326 LuaRoot /usr/local/apache2/lua
1327 LuaAuthzProvider foo authz.lua authz_check_foo
1333 <pre class="prettyprint lang-lua">
1335 function authz_check_foo(r, who)
1336 if r.user ~= who then return apache2.AUTHZ_DENIED
1337 return apache2.AUTHZ_GRANTED
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="LuaCodeCache" id="LuaCodeCache">LuaCodeCache</a> <a name="luacodecache" id="luacodecache">Directive</a></h2>
1347 <table class="directive">
1348 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Configure the compiled code cache.</td></tr>
1349 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaCodeCache stat|forever|never</code></td></tr>
1350 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>LuaCodeCache stat</code></td></tr>
1351 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1352 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1353 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1354 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1356 Specify the behavior of the in-memory code cache. The default
1357 is stat, which stats the top level script (not any included
1358 ones) each time that file is needed, and reloads it if the
1359 modified time indicates it is newer than the one it has
1360 already loaded. The other values cause it to keep the file
1361 cached forever (don't stat and replace) or to never cache the
1364 <p>In general stat or forever is good for production, and stat or never
1365 for development.</p>
1367 <div class="example"><h3>Examples:</h3><pre class="prettyprint lang-config">
1369 LuaCodeCache forever
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="LuaHookAccessChecker" id="LuaHookAccessChecker">LuaHookAccessChecker</a> <a name="luahookaccesschecker" id="luahookaccesschecker">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 access_checker phase of request processing</td></tr>
1380 <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>
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 <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>
1387 <p>Add your hook to the access_checker phase. An access checker
1388 hook function usually returns OK, DECLINED, or HTTP_FORBIDDEN.</p>
1389 <div class="note"><h3>Ordering</h3><p>The optional arguments "early" or "late"
1390 control when this script runs relative to other modules.</p></div>
1393 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1394 <div class="directive-section"><h2><a name="LuaHookAuthChecker" id="LuaHookAuthChecker">LuaHookAuthChecker</a> <a name="luahookauthchecker" id="luahookauthchecker">Directive</a></h2>
1395 <table class="directive">
1396 <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>
1397 <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>
1398 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1399 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1400 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1401 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1402 <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>
1404 <p>Invoke a lua function in the auth_checker phase of processing
1405 a request. This can be used to implement arbitrary authentication
1406 and authorization checking. A very simple example:
1408 <pre class="prettyprint lang-lua">
1411 -- fake authcheck hook
1412 -- If request has no auth info, set the response header and
1413 -- return a 401 to ask the browser for basic auth info.
1414 -- If request has auth info, don't actually look at it, just
1415 -- pretend we got userid 'foo' and validated it.
1416 -- Then check if the userid is 'foo' and accept the request.
1417 function authcheck_hook(r)
1419 -- look for auth info
1420 auth = r.headers_in['Authorization']
1426 if r.user == nil then
1427 r:debug("authcheck: user is nil, returning 401")
1428 r.err_headers_out['WWW-Authenticate'] = 'Basic realm="WallyWorld"'
1430 elseif r.user == "foo" then
1431 r:debug('user foo: OK')
1433 r:debug("authcheck: user='" .. r.user .. "'")
1434 r.err_headers_out['WWW-Authenticate'] = 'Basic realm="WallyWorld"'
1441 <div class="note"><h3>Ordering</h3><p>The optional arguments "early" or "late"
1442 control when this script runs relative to other modules.</p></div>
1445 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1446 <div class="directive-section"><h2><a name="LuaHookCheckUserID" id="LuaHookCheckUserID">LuaHookCheckUserID</a> <a name="luahookcheckuserid" id="luahookcheckuserid">Directive</a></h2>
1447 <table class="directive">
1448 <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>
1449 <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>
1450 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1451 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1452 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1453 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1454 <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>
1456 <div class="note"><h3>Ordering</h3><p>The optional arguments "early" or "late"
1457 control when this script runs relative to other modules.</p></div>
1460 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1461 <div class="directive-section"><h2><a name="LuaHookFixups" id="LuaHookFixups">LuaHookFixups</a> <a name="luahookfixups" id="luahookfixups">Directive</a></h2>
1462 <table class="directive">
1463 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Provide a hook for the fixups phase of a request
1464 processing</td></tr>
1465 <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>
1466 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1467 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1468 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1469 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1472 Just like LuaHookTranslateName, but executed at the fixups phase
1476 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1477 <div class="directive-section"><h2><a name="LuaHookInsertFilter" id="LuaHookInsertFilter">LuaHookInsertFilter</a> <a name="luahookinsertfilter" id="luahookinsertfilter">Directive</a></h2>
1478 <table class="directive">
1479 <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>
1480 <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>
1481 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1482 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1483 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1484 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1485 </table><p>Not Yet Implemented</p>
1487 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1488 <div class="directive-section"><h2><a name="LuaHookLog" id="LuaHookLog">LuaHookLog</a> <a name="luahooklog" id="luahooklog">Directive</a></h2>
1489 <table class="directive">
1490 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Provide a hook for the access log phase of a request
1491 processing</td></tr>
1492 <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>
1493 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1494 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1495 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1496 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1499 This simple logging hook allows you to run a function when httpd enters the
1500 logging phase of a request. With it, you can append data to your own logs,
1501 manipulate data before the regular log is written, or prevent a log entry
1502 from being created. To prevent the usual logging from happening, simply return
1503 <code>apache2.DONE</code> in your logging handler, otherwise return
1504 <code>apache2.OK</code> to tell httpd to log as normal.
1507 <pre class="prettyprint lang-config">
1508 LuaHookLog /path/to/script.lua logger
1511 <pre class="prettyprint lang-lua">
1512 -- /path/to/script.lua --
1515 -- If 1, then we write to our own Lua log and tell httpd not to log
1517 -- If 2, then we just sanitize the output a bit and tell httpd to
1518 -- log the sanitized bits.
1520 if math.random(1,2) == 1 then
1521 -- Log stuff ourselves and don't log in the regular log
1522 local f = io.open("/foo/secret.log", "a")
1524 f:write("Something secret happened at " .. r.uri .. "\n")
1527 return apache2.DONE -- Tell httpd not to use the regular logging functions
1529 r.uri = r.uri:gsub("somesecretstuff", "") -- sanitize the URI
1530 return apache2.OK -- tell httpd to log it.
1537 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1538 <div class="directive-section"><h2><a name="LuaHookMapToStorage" id="LuaHookMapToStorage">LuaHookMapToStorage</a> <a name="luahookmaptostorage" id="luahookmaptostorage">Directive</a></h2>
1539 <table class="directive">
1540 <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>
1541 <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>
1542 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1543 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1544 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1545 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1547 <p>Like <code class="directive">LuaHookTranslateName</code> but executed at the
1548 map-to-storage phase of a request. Modules like mod_cache run at this phase,
1549 which makes for an interesting example on what to do here:</p>
1550 <pre class="prettyprint lang-config">
1551 LuaHookMapToStorage /path/to/lua/script.lua check_cache
1554 <pre class="prettyprint lang-lua">
1558 function read_file(filename)
1559 local input = io.open(filename, "r")
1561 local data = input:read("*a")
1562 cached_files[filename] = data
1563 file = cached_files[filename]
1566 return cached_files[filename]
1569 function check_cache(r)
1570 if r.filename:match("%.png$") then -- Only match PNG files
1571 local file = cached_files[r.filename] -- Check cache entries
1573 file = read_file(r.filename) -- Read file into cache
1575 if file then -- If file exists, write it out
1578 r:info(("Sent %s to client from cache"):format(r.filename))
1579 return apache2.DONE -- skip default handler for PNG files
1582 return apache2.DECLINED -- If we had nothing to do, let others serve this.
1589 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1590 <div class="directive-section"><h2><a name="LuaHookTranslateName" id="LuaHookTranslateName">LuaHookTranslateName</a> <a name="luahooktranslatename" id="luahooktranslatename">Directive</a></h2>
1591 <table class="directive">
1592 <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>
1593 <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>
1594 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1595 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1596 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1597 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1598 <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>
1600 Add a hook (at APR_HOOK_MIDDLE) to the translate name phase of
1601 request processing. The hook function receives a single
1602 argument, the request_rec, and should return a status code,
1603 which is either an HTTP error code, or the constants defined
1604 in the apache2 module: apache2.OK, apache2.DECLINED, or
1607 <p>For those new to hooks, basically each hook will be invoked
1608 until one of them returns apache2.OK. If your hook doesn't
1609 want to do the translation it should just return
1610 apache2.DECLINED. If the request should stop processing, then
1611 return apache2.DONE.</p>
1615 <pre class="prettyprint lang-config">
1617 LuaHookTranslateName /scripts/conf/hooks.lua silly_mapper
1621 <pre class="prettyprint lang-lua">
1622 -- /scripts/conf/hooks.lua --
1624 function silly_mapper(r)
1625 if r.uri == "/" then
1626 r.filename = "/var/www/home.lua"
1629 return apache2.DECLINED
1635 <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
1638 <div class="note"><h3>Ordering</h3><p>The optional arguments "early" or "late"
1639 control when this script runs relative to other modules.</p></div>
1643 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1644 <div class="directive-section"><h2><a name="LuaHookTypeChecker" id="LuaHookTypeChecker">LuaHookTypeChecker</a> <a name="luahooktypechecker" id="luahooktypechecker">Directive</a></h2>
1645 <table class="directive">
1646 <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>
1647 <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>
1648 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1649 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1650 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1651 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1653 This directive provides a hook for the type_checker phase of the request processing.
1654 This phase is where requests are assigned a content type and a handler, and thus can
1655 be used to modify the type and handler based on input:
1657 <pre class="prettyprint lang-config">
1658 LuaHookTypeChecker /path/to/lua/script.lua type_checker
1661 <pre class="prettyprint lang-lua">
1662 function type_checker(r)
1663 if r.uri:match("%.to_gif$") then -- match foo.png.to_gif
1664 r.content_type = "image/gif" -- assign it the image/gif type
1665 r.handler = "gifWizard" -- tell the gifWizard module to handle this
1666 r.filename = r.uri:gsub("%.to_gif$", "") -- fix the filename requested
1670 return apache2.DECLINED
1676 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1677 <div class="directive-section"><h2><a name="LuaInherit" id="LuaInherit">LuaInherit</a> <a name="luainherit" id="luainherit">Directive</a></h2>
1678 <table class="directive">
1679 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Controls how parent configuration sections are merged into children</td></tr>
1680 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaInherit none|parent-first|parent-last</code></td></tr>
1681 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>LuaInherit parent-first</code></td></tr>
1682 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1683 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1684 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1685 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1686 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>2.4.0 and later</td></tr>
1687 </table><p>By default, if LuaHook* directives are used in overlapping
1688 Directory or Location configuration sections, the scripts defined in the
1689 more specific section are run <em>after</em> those defined in the more
1690 generic section (LuaInherit parent-first). You can reverse this order, or
1691 make the parent context not apply at all.</p>
1693 <p> In previous 2.3.x releases, the default was effectively to ignore LuaHook*
1694 directives from parent configuration sections.</p>
1696 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1697 <div class="directive-section"><h2><a name="LuaInputFilter" id="LuaInputFilter">LuaInputFilter</a> <a name="luainputfilter" id="luainputfilter">Directive</a></h2>
1698 <table class="directive">
1699 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Provide a Lua function for content input filtering</td></tr>
1700 <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>
1701 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
1702 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1703 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1704 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>2.5.0 and later</td></tr>
1706 <p>Provides a means of adding a Lua function as an input filter.
1707 As with output filters, input filters work as coroutines,
1708 first yielding before buffers are sent, then yielding whenever
1709 a bucket needs to be passed down the chain, and finally (optionally)
1710 yielding anything that needs to be appended to the input data. The
1711 global variable <code>bucket</code> holds the buckets as they are passed
1712 onto the Lua script:
1715 <pre class="prettyprint lang-config">
1716 LuaInputFilter myInputFilter /www/filter.lua input_filter
1717 <FilesMatch "\.lua>
1718 SetInputFilter myInputFilter
1722 <pre class="prettyprint lang-lua">
1724 Example input filter that converts all POST data to uppercase.
1726 function input_filter(r)
1727 print("luaInputFilter called") -- debug print
1728 coroutine.yield() -- Yield and wait for buckets
1729 while bucket do -- For each bucket, do...
1730 local output = string.upper(bucket) -- Convert all POST data to uppercase
1731 coroutine.yield(output) -- Send converted data down the chain
1733 -- No more buckets available.
1734 coroutine.yield("&filterSignature=1234") -- Append signature at the end
1739 The input filter supports denying/skipping a filter if it is deemed unwanted:
1741 <pre class="prettyprint lang-lua">
1742 function input_filter(r)
1744 return -- Simply deny filtering, passing on the original content instead
1746 coroutine.yield() -- wait for buckets
1747 ... -- insert filter stuff here
1752 See "<a href="#modifying_buckets">Modifying contents with Lua
1753 filters</a>" for more information.
1757 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1758 <div class="directive-section"><h2><a name="LuaMapHandler" id="LuaMapHandler">LuaMapHandler</a> <a name="luamaphandler" id="luamaphandler">Directive</a></h2>
1759 <table class="directive">
1760 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Map a path to a lua handler</td></tr>
1761 <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>
1762 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1763 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1764 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1765 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1767 <p>This directive matches a uri pattern to invoke a specific
1768 handler function in a specific file. It uses PCRE regular
1769 expressions to match the uri, and supports interpolating
1770 match groups into both the file path and the function name.
1771 Be careful writing your regular expressions to avoid security
1773 <div class="example"><h3>Examples:</h3><pre class="prettyprint lang-config">
1774 LuaMapHandler /(\w+)/(\w+) /scripts/$1.lua handle_$2
1777 <p>This would match uri's such as /photos/show?id=9
1778 to the file /scripts/photos.lua and invoke the
1779 handler function handle_show on the lua vm after
1780 loading that file.</p>
1782 <pre class="prettyprint lang-config">
1783 LuaMapHandler /bingo /scripts/wombat.lua
1786 <p>This would invoke the "handle" function, which
1787 is the default if no specific function name is
1791 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1792 <div class="directive-section"><h2><a name="LuaOutputFilter" id="LuaOutputFilter">LuaOutputFilter</a> <a name="luaoutputfilter" id="luaoutputfilter">Directive</a></h2>
1793 <table class="directive">
1794 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Provide a Lua function for content output filtering</td></tr>
1795 <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>
1796 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
1797 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1798 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1799 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>2.5.0 and later</td></tr>
1801 <p>Provides a means of adding a Lua function as an output filter.
1802 As with input filters, output filters work as coroutines,
1803 first yielding before buffers are sent, then yielding whenever
1804 a bucket needs to be passed down the chain, and finally (optionally)
1805 yielding anything that needs to be appended to the input data. The
1806 global variable <code>bucket</code> holds the buckets as they are passed
1807 onto the Lua script:
1810 <pre class="prettyprint lang-config">
1811 LuaOutputFilter myOutputFilter /www/filter.lua output_filter
1812 <FilesMatch "\.lua>
1813 SetOutputFilter myOutputFilter
1817 <pre class="prettyprint lang-lua">
1819 Example output filter that escapes all HTML entities in the output
1821 function output_filter(r)
1822 coroutine.yield("(Handled by myOutputFilter)<br/>\n") -- Prepend some data to the output,
1823 -- yield and wait for buckets.
1824 while bucket do -- For each bucket, do...
1825 local output = r:escape_html(bucket) -- Escape all output
1826 coroutine.yield(output) -- Send converted data down the chain
1828 -- No more buckets available.
1833 As with the input filter, the output filter supports denying/skipping a filter
1834 if it is deemed unwanted:
1836 <pre class="prettyprint lang-lua">
1837 function output_filter(r)
1838 if not r.content_type:match("text/html") then
1839 return -- Simply deny filtering, passing on the original content instead
1841 coroutine.yield() -- wait for buckets
1842 ... -- insert filter stuff here
1846 <div class="note"><h3>Lua filters with <code class="module"><a href="../mod/mod_filter.html">mod_filter</a></code></h3>
1847 <p> When a Lua filter is used as the underlying provider via the
1848 <code class="directive"><a href="../mod/mod_filter.html#filterprovider">FilterProvider</a></code> directive, filtering
1849 will only work when the <var>filter-name</var> is identical to the <var>provider-name</var>.
1853 See "<a href="#modifying_buckets">Modifying contents with Lua filters</a>" for more
1859 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1860 <div class="directive-section"><h2><a name="LuaPackageCPath" id="LuaPackageCPath">LuaPackageCPath</a> <a name="luapackagecpath" id="luapackagecpath">Directive</a></h2>
1861 <table class="directive">
1862 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Add a directory to lua's package.cpath</td></tr>
1863 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaPackageCPath /path/to/include/?.soa</code></td></tr>
1864 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1865 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1866 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1867 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1869 <p>Add a path to lua's shared library search path. Follows the same
1870 conventions as lua. This just munges the package.cpath in the
1875 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1876 <div class="directive-section"><h2><a name="LuaPackagePath" id="LuaPackagePath">LuaPackagePath</a> <a name="luapackagepath" id="luapackagepath">Directive</a></h2>
1877 <table class="directive">
1878 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Add a directory to lua's package.path</td></tr>
1879 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaPackagePath /path/to/include/?.lua</code></td></tr>
1880 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1881 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1882 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1883 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1884 </table><p>Add a path to lua's module search path. Follows the same
1885 conventions as lua. This just munges the package.path in the
1888 <div class="example"><h3>Examples:</h3><pre class="prettyprint lang-config">
1889 LuaPackagePath /scripts/lib/?.lua
1890 LuaPackagePath /scripts/lib/?/init.lua
1895 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1896 <div class="directive-section"><h2><a name="LuaQuickHandler" id="LuaQuickHandler">LuaQuickHandler</a> <a name="luaquickhandler" id="luaquickhandler">Directive</a></h2>
1897 <table class="directive">
1898 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Provide a hook for the quick handler of request processing</td></tr>
1899 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaQuickHandler /path/to/script.lua hook_function_name</code></td></tr>
1900 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1901 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1902 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1903 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1906 This phase is run immediately after the request has been mapped to a virtal host,
1907 and can be used to either do some request processing before the other phases kick
1908 in, or to serve a request without the need to translate, map to storage et cetera.
1909 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
1910 URIs have not been properly parsed yet.
1912 <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
1916 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1917 <div class="directive-section"><h2><a name="LuaRoot" id="LuaRoot">LuaRoot</a> <a name="luaroot" id="luaroot">Directive</a></h2>
1918 <table class="directive">
1919 <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>
1920 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaRoot /path/to/a/directory</code></td></tr>
1921 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1922 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1923 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1924 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1926 <p>Specify the base path which will be used to evaluate all
1927 relative paths within mod_lua. If not specified they
1928 will be resolved relative to the current working directory,
1929 which may not always work well for a server.</p>
1932 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1933 <div class="directive-section"><h2><a name="LuaScope" id="LuaScope">LuaScope</a> <a name="luascope" id="luascope">Directive</a></h2>
1934 <table class="directive">
1935 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>One of once, request, conn, thread -- default is once</td></tr>
1936 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LuaScope once|request|conn|thread|server [min] [max]</code></td></tr>
1937 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>LuaScope once</code></td></tr>
1938 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1939 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
1940 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
1941 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_lua</td></tr>
1943 <p>Specify the life cycle scope of the Lua interpreter which will
1944 be used by handlers in this "Directory." The default is "once"</p>
1947 <dt>once:</dt> <dd>use the interpreter once and throw it away.</dd>
1949 <dt>request:</dt> <dd>use the interpreter to handle anything based on
1950 the same file within this request, which is also
1951 request scoped.</dd>
1953 <dt>conn:</dt> <dd>Same as request but attached to the connection_rec</dd>
1955 <dt>thread:</dt> <dd>Use the interpreter for the lifetime of the thread
1956 handling the request (only available with threaded MPMs).</dd>
1958 <dt>server:</dt> <dd>This one is different than others because the
1959 server scope is quite long lived, and multiple threads
1960 will have the same server_rec. To accommodate this,
1961 server scoped Lua states are stored in an apr
1962 resource list. The <code>min</code> and <code>max</code> arguments
1963 specify the minimum and maximum number of Lua states to keep in the
1967 Generally speaking, the <code>thread</code> and <code>server</code> scopes
1968 execute roughly 2-3 times faster than the rest, because they don't have to
1969 spawn new Lua states on every request (especially with the event MPM, as
1970 even keepalive requests will use a new thread for each request). If you are
1971 satisfied that your scripts will not have problems reusing a state, then
1972 the <code>thread</code> or <code>server</code> scopes should be used for
1973 maximum performance. While the <code>thread</code> scope will provide the
1974 fastest responses, the <code>server</code> scope will use less memory, as
1975 states are pooled, allowing f.x. 1000 threads to share only 100 Lua states,
1976 thus using only 10% of the memory required by the <code>thread</code> scope.
1981 <div class="bottomlang">
1982 <p><span>Available Languages: </span><a href="../en/mod/mod_lua.html" title="English"> en </a> |
1983 <a href="../fr/mod/mod_lua.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
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