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

   1 /******************************************************************************
   2  * Icinga 2                                                                   *
   3  * Copyright (C) 2012-2016 Icinga Development Team (https://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 #ifdef _DEBUG
  52         Log(LogDebug, "Dependency")
  53                 << "Applying dependency '" << name << "' to object '" << checkable->GetName() << "' for rule " << di;
  54 #endif /* _DEBUG */
  55
  56         ConfigItemBuilder::Ptr builder = new ConfigItemBuilder(di);
  57         builder->SetType("Dependency");
  58         builder->SetName(name);
  59         builder->SetScope(frame.Locals->ShallowClone());
  60         builder->SetIgnoreOnError(rule.GetIgnoreOnError());
  61
  62         Host::Ptr host;
  63         Service::Ptr service;
  64         tie(host, service) = GetHostService(checkable);
  65
  66         builder->AddExpression(new SetExpression(MakeIndexer(ScopeThis, "parent_host_name"), OpSetLiteral, MakeLiteral(host->GetName()), di));
  67         builder->AddExpression(new SetExpression(MakeIndexer(ScopeThis, "child_host_name"), OpSetLiteral, MakeLiteral(host->GetName()), di));
  68
  69         if (service)
  70                 builder->AddExpression(new SetExpression(MakeIndexer(ScopeThis, "child_service_name"), OpSetLiteral, MakeLiteral(service->GetShortName()), di));
  71
  72         String zone = checkable->GetZoneName();
  73
  74         if (!zone.IsEmpty())
  75                 builder->AddExpression(new SetExpression(MakeIndexer(ScopeThis, "zone"), OpSetLiteral, MakeLiteral(zone), di));
  76
  77         builder->AddExpression(new SetExpression(MakeIndexer(ScopeThis, "package"), OpSetLiteral, MakeLiteral(rule.GetPackage()), di));
  78
  79         builder->AddExpression(new OwnedExpression(rule.GetExpression()));
  80
  81         ConfigItem::Ptr dependencyItem = builder->Compile();
  82         dependencyItem->Register();
  83
  84         return true;
  85 }
  86
  87 bool Dependency::EvaluateApplyRule(const Checkable::Ptr& checkable, const ApplyRule& rule)
  88 {
  89         DebugInfo di = rule.GetDebugInfo();
  90
  91         std::ostringstream msgbuf;
  92         msgbuf << "Evaluating 'apply' rule (" << di << ")";
  93         CONTEXT(msgbuf.str());
  94
  95         Host::Ptr host;
  96         Service::Ptr service;
  97         tie(host, service) = GetHostService(checkable);
  98
  99         ScriptFrame frame;
 100         if (rule.GetScope())
 101                 rule.GetScope()->CopyTo(frame.Locals);
 102         frame.Locals->Set("host", host);
 103         if (service)
 104                 frame.Locals->Set("service", service);
 105
 106         Value vinstances;
 107
 108         if (rule.GetFTerm()) {
 109                 try {
 110                         vinstances = rule.GetFTerm()->Evaluate(frame);
 111                 } catch (const std::exception&) {
 112                         /* Silently ignore errors here and assume there are no instances. */
 113                         return false;
 114                 }
 115         } else {
 116                 Array::Ptr instances = new Array();
 117                 instances->Add("");
 118                 vinstances = instances;
 119         }
 120
 121         bool match = false;
 122
 123         if (vinstances.IsObjectType<Array>()) {
 124                 if (!rule.GetFVVar().IsEmpty())
 125                         BOOST_THROW_EXCEPTION(ScriptError("Dictionary iterator requires value to be a dictionary.", di));
 126
 127                 Array::Ptr arr = vinstances;
 128
 129                 ObjectLock olock(arr);
 130                 BOOST_FOREACH(const Value& instance, arr) {
 131                         String name = rule.GetName();
 132
 133                         if (!rule.GetFKVar().IsEmpty()) {
 134                                 frame.Locals->Set(rule.GetFKVar(), instance);
 135                                 name += instance;
 136                         }
 137
 138                         if (EvaluateApplyRuleInstance(checkable, name, frame, rule))
 139                                 match = true;
 140                 }
 141         } else if (vinstances.IsObjectType<Dictionary>()) {
 142                 if (rule.GetFVVar().IsEmpty())
 143                         BOOST_THROW_EXCEPTION(ScriptError("Array iterator requires value to be an array.", di));
 144
 145                 Dictionary::Ptr dict = vinstances;
 146
 147                 BOOST_FOREACH(const String& key, dict->GetKeys()) {
 148                         frame.Locals->Set(rule.GetFKVar(), key);
 149                         frame.Locals->Set(rule.GetFVVar(), dict->Get(key));
 150
 151                         if (EvaluateApplyRuleInstance(checkable, rule.GetName() + key, frame, rule))
 152                                 match = true;
 153                 }
 154         }
 155
 156         return match;
 157 }
 158
 159 void Dependency::EvaluateApplyRules(const Host::Ptr& host)
 160 {
 161         CONTEXT("Evaluating 'apply' rules for host '" + host->GetName() + "'");
 162
 163         BOOST_FOREACH(ApplyRule& rule, ApplyRule::GetRules("Dependency")) {
 164                 if (rule.GetTargetType() != "Host")
 165                         continue;
 166
 167                 if (EvaluateApplyRule(host, rule))
 168                         rule.AddMatch();
 169         }
 170 }
 171
 172 void Dependency::EvaluateApplyRules(const Service::Ptr& service)
 173 {
 174         CONTEXT("Evaluating 'apply' rules for service '" + service->GetName() + "'");
 175
 176         BOOST_FOREACH(ApplyRule& rule, ApplyRule::GetRules("Dependency")) {
 177                 if (rule.GetTargetType() != "Service")
 178                         continue;
 179
 180                 if (EvaluateApplyRule(service, rule))
 181                         rule.AddMatch();
 182         }
 183 }