granicus.if.org Git - icinga2/blob - lib/icinga/dependency-apply.cpp

   1 /******************************************************************************
   2  * Icinga 2                                                                   *
   3  * Copyright (C) 2012-2018 Icinga Development Team (https://www.icinga.com/)  *
   4  *                                                                            *
   5  * This program is free software; you can redistribute it and/or              *
   6  * modify it under the terms of the GNU General Public License                *
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   8  * of the License, or (at your option) any later version.                     *
   9  *                                                                            *
  10  * This program is distributed in the hope that it will be useful,            *
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  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              *
  13  * GNU General Public License for more details.                               *
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  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.             *
  18  ******************************************************************************/
  19
  20 #include "icinga/dependency.hpp"
  21 #include "icinga/service.hpp"
  22 #include "config/configitembuilder.hpp"
  23 #include "config/applyrule.hpp"
  24 #include "base/initialize.hpp"
  25 #include "base/configtype.hpp"
  26 #include "base/logger.hpp"
  27 #include "base/context.hpp"
  28 #include "base/workqueue.hpp"
  29 #include "base/exception.hpp"
  30
  31 using namespace icinga;
  32
  33 INITIALIZE_ONCE([]() {
  34         ApplyRule::RegisterType("Dependency", { "Host", "Service" });
  35 });
  36
  37 bool Dependency::EvaluateApplyRuleInstance(const Checkable::Ptr& checkable, const String& name, ScriptFrame& frame, const ApplyRule& rule)
  38 {
  39         if (!rule.EvaluateFilter(frame))
  40                 return false;
  41
  42         DebugInfo di = rule.GetDebugInfo();
  43
  44 #ifdef _DEBUG
  45         Log(LogDebug, "Dependency")
  46                 << "Applying dependency '" << name << "' to object '" << checkable->GetName() << "' for rule " << di;
  47 #endif /* _DEBUG */
  48
  49         ConfigItemBuilder builder{di};
  50         builder.SetType(Dependency::TypeInstance);
  51         builder.SetName(name);
  52         builder.SetScope(frame.Locals->ShallowClone());
  53         builder.SetIgnoreOnError(rule.GetIgnoreOnError());
  54
  55         Host::Ptr host;
  56         Service::Ptr service;
  57         tie(host, service) = GetHostService(checkable);
  58
  59         builder.AddExpression(new SetExpression(MakeIndexer(ScopeThis, "parent_host_name"), OpSetLiteral, MakeLiteral(host->GetName()), di));
  60         builder.AddExpression(new SetExpression(MakeIndexer(ScopeThis, "child_host_name"), OpSetLiteral, MakeLiteral(host->GetName()), di));
  61
  62         if (service)
  63                 builder.AddExpression(new SetExpression(MakeIndexer(ScopeThis, "child_service_name"), OpSetLiteral, MakeLiteral(service->GetShortName()), di));
  64
  65         String zone = checkable->GetZoneName();
  66
  67         if (!zone.IsEmpty())
  68                 builder.AddExpression(new SetExpression(MakeIndexer(ScopeThis, "zone"), OpSetLiteral, MakeLiteral(zone), di));
  69
  70         builder.AddExpression(new SetExpression(MakeIndexer(ScopeThis, "package"), OpSetLiteral, MakeLiteral(rule.GetPackage()), di));
  71
  72         builder.AddExpression(new ImportDefaultTemplatesExpression());
  73
  74         builder.AddExpression(new OwnedExpression(rule.GetExpression()));
  75
  76         ConfigItem::Ptr dependencyItem = builder.Compile();
  77         dependencyItem->Register();
  78
  79         return true;
  80 }
  81
  82 bool Dependency::EvaluateApplyRule(const Checkable::Ptr& checkable, const ApplyRule& rule)
  83 {
  84         DebugInfo di = rule.GetDebugInfo();
  85
  86         std::ostringstream msgbuf;
  87         msgbuf << "Evaluating 'apply' rule (" << di << ")";
  88         CONTEXT(msgbuf.str());
  89
  90         Host::Ptr host;
  91         Service::Ptr service;
  92         tie(host, service) = GetHostService(checkable);
  93
  94         ScriptFrame frame(true);
  95         if (rule.GetScope())
  96                 rule.GetScope()->CopyTo(frame.Locals);
  97         frame.Locals->Set("host", host);
  98         if (service)
  99                 frame.Locals->Set("service", service);
 100
 101         Value vinstances;
 102
 103         if (rule.GetFTerm()) {
 104                 try {
 105                         vinstances = rule.GetFTerm()->Evaluate(frame);
 106                 } catch (const std::exception&) {
 107                         /* Silently ignore errors here and assume there are no instances. */
 108                         return false;
 109                 }
 110         } else {
 111                 vinstances = new Array({ "" });
 112         }
 113
 114         bool match = false;
 115
 116         if (vinstances.IsObjectType<Array>()) {
 117                 if (!rule.GetFVVar().IsEmpty())
 118                         BOOST_THROW_EXCEPTION(ScriptError("Dictionary iterator requires value to be a dictionary.", di));
 119
 120                 Array::Ptr arr = vinstances;
 121
 122                 ObjectLock olock(arr);
 123                 for (const Value& instance : arr) {
 124                         String name = rule.GetName();
 125
 126                         if (!rule.GetFKVar().IsEmpty()) {
 127                                 frame.Locals->Set(rule.GetFKVar(), instance);
 128                                 name += instance;
 129                         }
 130
 131                         if (EvaluateApplyRuleInstance(checkable, name, frame, rule))
 132                                 match = true;
 133                 }
 134         } else if (vinstances.IsObjectType<Dictionary>()) {
 135                 if (rule.GetFVVar().IsEmpty())
 136                         BOOST_THROW_EXCEPTION(ScriptError("Array iterator requires value to be an array.", di));
 137
 138                 Dictionary::Ptr dict = vinstances;
 139
 140                 for (const String& key : dict->GetKeys()) {
 141                         frame.Locals->Set(rule.GetFKVar(), key);
 142                         frame.Locals->Set(rule.GetFVVar(), dict->Get(key));
 143
 144                         if (EvaluateApplyRuleInstance(checkable, rule.GetName() + key, frame, rule))
 145                                 match = true;
 146                 }
 147         }
 148
 149         return match;
 150 }
 151
 152 void Dependency::EvaluateApplyRules(const Host::Ptr& host)
 153 {
 154         CONTEXT("Evaluating 'apply' rules for host '" + host->GetName() + "'");
 155
 156         for (ApplyRule& rule : ApplyRule::GetRules("Dependency")) {
 157                 if (rule.GetTargetType() != "Host")
 158                         continue;
 159
 160                 if (EvaluateApplyRule(host, rule))
 161                         rule.AddMatch();
 162         }
 163 }
 164
 165 void Dependency::EvaluateApplyRules(const Service::Ptr& service)
 166 {
 167         CONTEXT("Evaluating 'apply' rules for service '" + service->GetName() + "'");
 168
 169         for (ApplyRule& rule : ApplyRule::GetRules("Dependency")) {
 170                 if (rule.GetTargetType() != "Service")
 171                         continue;
 172
 173                 if (EvaluateApplyRule(service, rule))
 174                         rule.AddMatch();
 175         }
 176 }