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

   1 /******************************************************************************
   2  * Icinga 2                                                                   *
   3  * Copyright (C) 2012-2015 Icinga Development Team (http://www.icinga.org)    *
   4  *                                                                            *
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   8  * of the License, or (at your option) any later version.                     *
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  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 #include <boost/foreach.hpp>
  31
  32 using namespace icinga;
  33
  34 INITIALIZE_ONCE(&Dependency::RegisterApplyRuleHandler);
  35
  36 void Dependency::RegisterApplyRuleHandler(void)
  37 {
  38         std::vector<String> targets;
  39         targets.push_back("Host");
  40         targets.push_back("Service");
  41         ApplyRule::RegisterType("Dependency", targets);
  42 }
  43
  44 bool Dependency::EvaluateApplyRuleInstance(const Checkable::Ptr& checkable, const String& name, ScriptFrame& frame, const ApplyRule& rule)
  45 {
  46         if (!rule.EvaluateFilter(frame))
  47                 return false;
  48
  49         DebugInfo di = rule.GetDebugInfo();
  50
  51         Log(LogDebug, "Dependency")
  52                 << "Applying dependency '" << name << "' to object '" << checkable->GetName() << "' for rule " << di;
  53
  54         ConfigItemBuilder::Ptr builder = new ConfigItemBuilder(di);
  55         builder->SetType("Dependency");
  56         builder->SetName(name);
  57         builder->SetScope(frame.Locals->ShallowClone());
  58
  59         Host::Ptr host;
  60         Service::Ptr service;
  61         tie(host, service) = GetHostService(checkable);
  62
  63         builder->AddExpression(new SetExpression(MakeIndexer(ScopeThis, "parent_host_name"), OpSetLiteral, MakeLiteral(host->GetName()), di));
  64         builder->AddExpression(new SetExpression(MakeIndexer(ScopeThis, "child_host_name"), OpSetLiteral, MakeLiteral(host->GetName()), di));
  65
  66         if (service)
  67                 builder->AddExpression(new SetExpression(MakeIndexer(ScopeThis, "child_service_name"), OpSetLiteral, MakeLiteral(service->GetShortName()), di));
  68
  69         String zone = checkable->GetZoneName();
  70
  71         if (!zone.IsEmpty())
  72                 builder->AddExpression(new SetExpression(MakeIndexer(ScopeThis, "zone"), OpSetLiteral, MakeLiteral(zone), di));
  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;
  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                 Array::Ptr instances = new Array();
 112                 instances->Add("");
 113                 vinstances = instances;
 114         }
 115
 116         bool match = false;
 117
 118         if (vinstances.IsObjectType<Array>()) {
 119                 if (!rule.GetFVVar().IsEmpty())
 120                         BOOST_THROW_EXCEPTION(ScriptError("Array iterator requires value to be an array.", di));
 121
 122                 Array::Ptr arr = vinstances;
 123                 Array::Ptr arrclone = arr->ShallowClone();
 124
 125                 ObjectLock olock(arrclone);
 126                 BOOST_FOREACH(const Value& instance, arrclone) {
 127                         String name = rule.GetName();
 128
 129                         if (!rule.GetFKVar().IsEmpty()) {
 130                                 frame.Locals->Set(rule.GetFKVar(), instance);
 131                                 name += instance;
 132                         }
 133
 134                         if (EvaluateApplyRuleInstance(checkable, name, frame, rule))
 135                                 match = true;
 136                 }
 137         } else if (vinstances.IsObjectType<Dictionary>()) {
 138                 if (rule.GetFVVar().IsEmpty())
 139                         BOOST_THROW_EXCEPTION(ScriptError("Dictionary iterator requires value to be a dictionary.", di));
 140
 141                 Dictionary::Ptr dict = vinstances;
 142
 143                 BOOST_FOREACH(const String& key, dict->GetKeys()) {
 144                         frame.Locals->Set(rule.GetFKVar(), key);
 145                         frame.Locals->Set(rule.GetFVVar(), dict->Get(key));
 146
 147                         if (EvaluateApplyRuleInstance(checkable, rule.GetName() + key, frame, rule))
 148                                 match = true;
 149                 }
 150         }
 151
 152         return match;
 153 }
 154
 155 void Dependency::EvaluateApplyRules(const Host::Ptr& host)
 156 {
 157         CONTEXT("Evaluating 'apply' rules for host '" + host->GetName() + "'");
 158
 159         BOOST_FOREACH(ApplyRule& rule, ApplyRule::GetRules("Dependency")) {
 160                 if (rule.GetTargetType() != "Host")
 161                         continue;
 162
 163                 if (EvaluateApplyRule(host, rule))
 164                         rule.AddMatch();
 165         }
 166 }
 167
 168 void Dependency::EvaluateApplyRules(const Service::Ptr& service)
 169 {
 170         CONTEXT("Evaluating 'apply' rules for service '" + service->GetName() + "'");
 171
 172         BOOST_FOREACH(ApplyRule& rule, ApplyRule::GetRules("Dependency")) {
 173                 if (rule.GetTargetType() != "Service")
 174                         continue;
 175
 176                 if (EvaluateApplyRule(service, rule))
 177                         rule.AddMatch();
 178         }
 179 }