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  *                                                                            *
   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         std::vector<String> targets;
  35         targets.push_back("Host");
  36         targets.push_back("Service");
  37         ApplyRule::RegisterType("Dependency", targets);
  38 });
  39
  40 bool Dependency::EvaluateApplyRuleInstance(const Checkable::Ptr& checkable, const String& name, ScriptFrame& frame, const ApplyRule& rule)
  41 {
  42         if (!rule.EvaluateFilter(frame))
  43                 return false;
  44
  45         DebugInfo di = rule.GetDebugInfo();
  46
  47 #ifdef _DEBUG
  48         Log(LogDebug, "Dependency")
  49                 << "Applying dependency '" << name << "' to object '" << checkable->GetName() << "' for rule " << di;
  50 #endif /* _DEBUG */
  51
  52         ConfigItemBuilder::Ptr builder = new ConfigItemBuilder(di);
  53         builder->SetType("Dependency");
  54         builder->SetName(name);
  55         builder->SetScope(frame.Locals->ShallowClone());
  56         builder->SetIgnoreOnError(rule.GetIgnoreOnError());
  57
  58         Host::Ptr host;
  59         Service::Ptr service;
  60         tie(host, service) = GetHostService(checkable);
  61
  62         builder->AddExpression(new SetExpression(MakeIndexer(ScopeThis, "parent_host_name"), OpSetLiteral, MakeLiteral(host->GetName()), di));
  63         builder->AddExpression(new SetExpression(MakeIndexer(ScopeThis, "child_host_name"), OpSetLiteral, MakeLiteral(host->GetName()), di));
  64
  65         if (service)
  66                 builder->AddExpression(new SetExpression(MakeIndexer(ScopeThis, "child_service_name"), OpSetLiteral, MakeLiteral(service->GetShortName()), di));
  67
  68         String zone = checkable->GetZoneName();
  69
  70         if (!zone.IsEmpty())
  71                 builder->AddExpression(new SetExpression(MakeIndexer(ScopeThis, "zone"), OpSetLiteral, MakeLiteral(zone), di));
  72
  73         builder->AddExpression(new SetExpression(MakeIndexer(ScopeThis, "package"), OpSetLiteral, MakeLiteral(rule.GetPackage()), di));
  74
  75         builder->AddExpression(new OwnedExpression(rule.GetExpression()));
  76
  77         ConfigItem::Ptr dependencyItem = builder->Compile();
  78         dependencyItem->Register();
  79
  80         return true;
  81 }
  82
  83 bool Dependency::EvaluateApplyRule(const Checkable::Ptr& checkable, const ApplyRule& rule)
  84 {
  85         DebugInfo di = rule.GetDebugInfo();
  86
  87         std::ostringstream msgbuf;
  88         msgbuf << "Evaluating 'apply' rule (" << di << ")";
  89         CONTEXT(msgbuf.str());
  90
  91         Host::Ptr host;
  92         Service::Ptr service;
  93         tie(host, service) = GetHostService(checkable);
  94
  95         ScriptFrame frame;
  96         if (rule.GetScope())
  97                 rule.GetScope()->CopyTo(frame.Locals);
  98         frame.Locals->Set("host", host);
  99         if (service)
 100                 frame.Locals->Set("service", service);
 101
 102         Value vinstances;
 103
 104         if (rule.GetFTerm()) {
 105                 try {
 106                         vinstances = rule.GetFTerm()->Evaluate(frame);
 107                 } catch (const std::exception&) {
 108                         /* Silently ignore errors here and assume there are no instances. */
 109                         return false;
 110                 }
 111         } else {
 112                 Array::Ptr instances = new Array();
 113                 instances->Add("");
 114                 vinstances = instances;
 115         }
 116
 117         bool match = false;
 118
 119         if (vinstances.IsObjectType<Array>()) {
 120                 if (!rule.GetFVVar().IsEmpty())
 121                         BOOST_THROW_EXCEPTION(ScriptError("Dictionary iterator requires value to be a dictionary.", di));
 122
 123                 Array::Ptr arr = vinstances;
 124
 125                 ObjectLock olock(arr);
 126                 for (const Value& instance : arr) {
 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("Array iterator requires value to be an array.", di));
 140
 141                 Dictionary::Ptr dict = vinstances;
 142
 143                 for (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         for (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         for (ApplyRule& rule : ApplyRule::GetRules("Dependency")) {
 173                 if (rule.GetTargetType() != "Service")
 174                         continue;
 175
 176                 if (EvaluateApplyRule(service, rule))
 177                         rule.AddMatch();
 178         }
 179 }