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

   1 /******************************************************************************
   2  * Icinga 2                                                                   *
   3  * Copyright (C) 2012-2017 Icinga Development Team (https://www.icinga.com/)  *
   4  *                                                                            *
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   8  * of the License, or (at your option) any later version.                     *
   9  *                                                                            *
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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
  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::Ptr builder = new ConfigItemBuilder(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;
  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("Dictionary iterator requires value to be a dictionary.", di));
 121
 122                 Array::Ptr arr = vinstances;
 123
 124                 ObjectLock olock(arr);
 125                 for (const Value& instance : arr) {
 126                         String name = rule.GetName();
 127
 128                         if (!rule.GetFKVar().IsEmpty()) {
 129                                 frame.Locals->Set(rule.GetFKVar(), instance);
 130                                 name += instance;
 131                         }
 132
 133                         if (EvaluateApplyRuleInstance(checkable, name, frame, rule))
 134                                 match = true;
 135                 }
 136         } else if (vinstances.IsObjectType<Dictionary>()) {
 137                 if (rule.GetFVVar().IsEmpty())
 138                         BOOST_THROW_EXCEPTION(ScriptError("Array iterator requires value to be an array.", di));
 139
 140                 Dictionary::Ptr dict = vinstances;
 141
 142                 for (const String& key : dict->GetKeys()) {
 143                         frame.Locals->Set(rule.GetFKVar(), key);
 144                         frame.Locals->Set(rule.GetFVVar(), dict->Get(key));
 145
 146                         if (EvaluateApplyRuleInstance(checkable, rule.GetName() + key, frame, rule))
 147                                 match = true;
 148                 }
 149         }
 150
 151         return match;
 152 }
 153
 154 void Dependency::EvaluateApplyRules(const Host::Ptr& host)
 155 {
 156         CONTEXT("Evaluating 'apply' rules for host '" + host->GetName() + "'");
 157
 158         for (ApplyRule& rule : ApplyRule::GetRules("Dependency")) {
 159                 if (rule.GetTargetType() != "Host")
 160                         continue;
 161
 162                 if (EvaluateApplyRule(host, rule))
 163                         rule.AddMatch();
 164         }
 165 }
 166
 167 void Dependency::EvaluateApplyRules(const Service::Ptr& service)
 168 {
 169         CONTEXT("Evaluating 'apply' rules for service '" + service->GetName() + "'");
 170
 171         for (ApplyRule& rule : ApplyRule::GetRules("Dependency")) {
 172                 if (rule.GetTargetType() != "Service")
 173                         continue;
 174
 175                 if (EvaluateApplyRule(service, rule))
 176                         rule.AddMatch();
 177         }
 178 }