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

   1 /* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
   2
   3 #include "icinga/dependency.hpp"
   4 #include "icinga/service.hpp"
   5 #include "config/configitembuilder.hpp"
   6 #include "config/applyrule.hpp"
   7 #include "base/initialize.hpp"
   8 #include "base/configtype.hpp"
   9 #include "base/logger.hpp"
  10 #include "base/context.hpp"
  11 #include "base/workqueue.hpp"
  12 #include "base/exception.hpp"
  13
  14 using namespace icinga;
  15
  16 INITIALIZE_ONCE([]() {
  17         ApplyRule::RegisterType("Dependency", { "Host", "Service" });
  18 });
  19
  20 bool Dependency::EvaluateApplyRuleInstance(const Checkable::Ptr& checkable, const String& name, ScriptFrame& frame, const ApplyRule& rule)
  21 {
  22         if (!rule.EvaluateFilter(frame))
  23                 return false;
  24
  25         DebugInfo di = rule.GetDebugInfo();
  26
  27 #ifdef _DEBUG
  28         Log(LogDebug, "Dependency")
  29                 << "Applying dependency '" << name << "' to object '" << checkable->GetName() << "' for rule " << di;
  30 #endif /* _DEBUG */
  31
  32         ConfigItemBuilder builder{di};
  33         builder.SetType(Dependency::TypeInstance);
  34         builder.SetName(name);
  35         builder.SetScope(frame.Locals->ShallowClone());
  36         builder.SetIgnoreOnError(rule.GetIgnoreOnError());
  37
  38         Host::Ptr host;
  39         Service::Ptr service;
  40         tie(host, service) = GetHostService(checkable);
  41
  42         builder.AddExpression(new SetExpression(MakeIndexer(ScopeThis, "parent_host_name"), OpSetLiteral, MakeLiteral(host->GetName()), di));
  43         builder.AddExpression(new SetExpression(MakeIndexer(ScopeThis, "child_host_name"), OpSetLiteral, MakeLiteral(host->GetName()), di));
  44
  45         if (service)
  46                 builder.AddExpression(new SetExpression(MakeIndexer(ScopeThis, "child_service_name"), OpSetLiteral, MakeLiteral(service->GetShortName()), di));
  47
  48         String zone = checkable->GetZoneName();
  49
  50         if (!zone.IsEmpty())
  51                 builder.AddExpression(new SetExpression(MakeIndexer(ScopeThis, "zone"), OpSetLiteral, MakeLiteral(zone), di));
  52
  53         builder.AddExpression(new SetExpression(MakeIndexer(ScopeThis, "package"), OpSetLiteral, MakeLiteral(rule.GetPackage()), di));
  54
  55         builder.AddExpression(new ImportDefaultTemplatesExpression());
  56
  57         builder.AddExpression(new OwnedExpression(rule.GetExpression()));
  58
  59         ConfigItem::Ptr dependencyItem = builder.Compile();
  60         dependencyItem->Register();
  61
  62         return true;
  63 }
  64
  65 bool Dependency::EvaluateApplyRule(const Checkable::Ptr& checkable, const ApplyRule& rule)
  66 {
  67         DebugInfo di = rule.GetDebugInfo();
  68
  69         std::ostringstream msgbuf;
  70         msgbuf << "Evaluating 'apply' rule (" << di << ")";
  71         CONTEXT(msgbuf.str());
  72
  73         Host::Ptr host;
  74         Service::Ptr service;
  75         tie(host, service) = GetHostService(checkable);
  76
  77         ScriptFrame frame(true);
  78         if (rule.GetScope())
  79                 rule.GetScope()->CopyTo(frame.Locals);
  80         frame.Locals->Set("host", host);
  81         if (service)
  82                 frame.Locals->Set("service", service);
  83
  84         Value vinstances;
  85
  86         if (rule.GetFTerm()) {
  87                 try {
  88                         vinstances = rule.GetFTerm()->Evaluate(frame);
  89                 } catch (const std::exception&) {
  90                         /* Silently ignore errors here and assume there are no instances. */
  91                         return false;
  92                 }
  93         } else {
  94                 vinstances = new Array({ "" });
  95         }
  96
  97         bool match = false;
  98
  99         if (vinstances.IsObjectType<Array>()) {
 100                 if (!rule.GetFVVar().IsEmpty())
 101                         BOOST_THROW_EXCEPTION(ScriptError("Dictionary iterator requires value to be a dictionary.", di));
 102
 103                 Array::Ptr arr = vinstances;
 104
 105                 ObjectLock olock(arr);
 106                 for (const Value& instance : arr) {
 107                         String name = rule.GetName();
 108
 109                         if (!rule.GetFKVar().IsEmpty()) {
 110                                 frame.Locals->Set(rule.GetFKVar(), instance);
 111                                 name += instance;
 112                         }
 113
 114                         if (EvaluateApplyRuleInstance(checkable, name, frame, rule))
 115                                 match = true;
 116                 }
 117         } else if (vinstances.IsObjectType<Dictionary>()) {
 118                 if (rule.GetFVVar().IsEmpty())
 119                         BOOST_THROW_EXCEPTION(ScriptError("Array iterator requires value to be an array.", di));
 120
 121                 Dictionary::Ptr dict = vinstances;
 122
 123                 for (const String& key : dict->GetKeys()) {
 124                         frame.Locals->Set(rule.GetFKVar(), key);
 125                         frame.Locals->Set(rule.GetFVVar(), dict->Get(key));
 126
 127                         if (EvaluateApplyRuleInstance(checkable, rule.GetName() + key, frame, rule))
 128                                 match = true;
 129                 }
 130         }
 131
 132         return match;
 133 }
 134
 135 void Dependency::EvaluateApplyRules(const Host::Ptr& host)
 136 {
 137         CONTEXT("Evaluating 'apply' rules for host '" + host->GetName() + "'");
 138
 139         for (ApplyRule& rule : ApplyRule::GetRules("Dependency")) {
 140                 if (rule.GetTargetType() != "Host")
 141                         continue;
 142
 143                 if (EvaluateApplyRule(host, rule))
 144                         rule.AddMatch();
 145         }
 146 }
 147
 148 void Dependency::EvaluateApplyRules(const Service::Ptr& service)
 149 {
 150         CONTEXT("Evaluating 'apply' rules for service '" + service->GetName() + "'");
 151
 152         for (ApplyRule& rule : ApplyRule::GetRules("Dependency")) {
 153                 if (rule.GetTargetType() != "Service")
 154                         continue;
 155
 156                 if (EvaluateApplyRule(service, rule))
 157                         rule.AddMatch();
 158         }
 159 }