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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  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         builder->SetIgnoreOnError(rule.GetIgnoreOnError());
  59
  60         Host::Ptr host;
  61         Service::Ptr service;
  62         tie(host, service) = GetHostService(checkable);
  63
  64         builder->AddExpression(new SetExpression(MakeIndexer(ScopeThis, "parent_host_name"), OpSetLiteral, MakeLiteral(host->GetName()), di));
  65         builder->AddExpression(new SetExpression(MakeIndexer(ScopeThis, "child_host_name"), OpSetLiteral, MakeLiteral(host->GetName()), di));
  66
  67         if (service)
  68                 builder->AddExpression(new SetExpression(MakeIndexer(ScopeThis, "child_service_name"), OpSetLiteral, MakeLiteral(service->GetShortName()), di));
  69
  70         String zone = checkable->GetZoneName();
  71
  72         if (!zone.IsEmpty())
  73                 builder->AddExpression(new SetExpression(MakeIndexer(ScopeThis, "zone"), OpSetLiteral, MakeLiteral(zone), di));
  74
  75         builder->AddExpression(new SetExpression(MakeIndexer(ScopeThis, "package"), OpSetLiteral, MakeLiteral(rule.GetPackage()), di));
  76
  77         builder->AddExpression(new OwnedExpression(rule.GetExpression()));
  78
  79         ConfigItem::Ptr dependencyItem = builder->Compile();
  80         dependencyItem->Register();
  81
  82         return true;
  83 }
  84
  85 bool Dependency::EvaluateApplyRule(const Checkable::Ptr& checkable, const ApplyRule& rule)
  86 {
  87         DebugInfo di = rule.GetDebugInfo();
  88
  89         std::ostringstream msgbuf;
  90         msgbuf << "Evaluating 'apply' rule (" << di << ")";
  91         CONTEXT(msgbuf.str());
  92
  93         Host::Ptr host;
  94         Service::Ptr service;
  95         tie(host, service) = GetHostService(checkable);
  96
  97         ScriptFrame frame;
  98         if (rule.GetScope())
  99                 rule.GetScope()->CopyTo(frame.Locals);
 100         frame.Locals->Set("host", host);
 101         if (service)
 102                 frame.Locals->Set("service", service);
 103
 104         Value vinstances;
 105
 106         if (rule.GetFTerm()) {
 107                 try {
 108                         vinstances = rule.GetFTerm()->Evaluate(frame);
 109                 } catch (const std::exception&) {
 110                         /* Silently ignore errors here and assume there are no instances. */
 111                         return false;
 112                 }
 113         } else {
 114                 Array::Ptr instances = new Array();
 115                 instances->Add("");
 116                 vinstances = instances;
 117         }
 118
 119         bool match = false;
 120
 121         if (vinstances.IsObjectType<Array>()) {
 122                 if (!rule.GetFVVar().IsEmpty())
 123                         BOOST_THROW_EXCEPTION(ScriptError("Dictionary iterator requires value to be a dictionary.", di));
 124
 125                 Array::Ptr arr = vinstances;
 126                 Array::Ptr arrclone = arr->ShallowClone();
 127
 128                 ObjectLock olock(arrclone);
 129                 BOOST_FOREACH(const Value& instance, arrclone) {
 130                         String name = rule.GetName();
 131
 132                         if (!rule.GetFKVar().IsEmpty()) {
 133                                 frame.Locals->Set(rule.GetFKVar(), instance);
 134                                 name += instance;
 135                         }
 136
 137                         if (EvaluateApplyRuleInstance(checkable, name, frame, rule))
 138                                 match = true;
 139                 }
 140         } else if (vinstances.IsObjectType<Dictionary>()) {
 141                 if (rule.GetFVVar().IsEmpty())
 142                         BOOST_THROW_EXCEPTION(ScriptError("Array iterator requires value to be an array.", di));
 143
 144                 Dictionary::Ptr dict = vinstances;
 145
 146                 BOOST_FOREACH(const String& key, dict->GetKeys()) {
 147                         frame.Locals->Set(rule.GetFKVar(), key);
 148                         frame.Locals->Set(rule.GetFVVar(), dict->Get(key));
 149
 150                         if (EvaluateApplyRuleInstance(checkable, rule.GetName() + key, frame, rule))
 151                                 match = true;
 152                 }
 153         }
 154
 155         return match;
 156 }
 157
 158 void Dependency::EvaluateApplyRules(const Host::Ptr& host)
 159 {
 160         CONTEXT("Evaluating 'apply' rules for host '" + host->GetName() + "'");
 161
 162         BOOST_FOREACH(ApplyRule& rule, ApplyRule::GetRules("Dependency")) {
 163                 if (rule.GetTargetType() != "Host")
 164                         continue;
 165
 166                 if (EvaluateApplyRule(host, rule))
 167                         rule.AddMatch();
 168         }
 169 }
 170
 171 void Dependency::EvaluateApplyRules(const Service::Ptr& service)
 172 {
 173         CONTEXT("Evaluating 'apply' rules for service '" + service->GetName() + "'");
 174
 175         BOOST_FOREACH(ApplyRule& rule, ApplyRule::GetRules("Dependency")) {
 176                 if (rule.GetTargetType() != "Service")
 177                         continue;
 178
 179                 if (EvaluateApplyRule(service, rule))
 180                         rule.AddMatch();
 181         }
 182 }