mirror of https://github.com/Icinga/icinga2.git
432 lines
12 KiB
C++
432 lines
12 KiB
C++
#include "i2-discovery.h"
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using namespace icinga;
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string DiscoveryComponent::GetName(void) const
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{
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return "discoverycomponent";
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}
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void DiscoveryComponent::Start(void)
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{
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m_DiscoveryEndpoint = make_shared<VirtualEndpoint>();
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long isBroker = 0;
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GetConfig()->GetPropertyInteger("broker", &isBroker);
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m_Broker = (isBroker != 0);
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if (IsBroker()) {
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m_DiscoveryEndpoint->RegisterMethodSource("discovery::NewComponent");
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m_DiscoveryEndpoint->RegisterMethodHandler("discovery::RegisterComponent",
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bind_weak(&DiscoveryComponent::RegisterComponentMessageHandler, shared_from_this()));
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}
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m_DiscoveryEndpoint->RegisterMethodSource("discovery::RegisterComponent");
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m_DiscoveryEndpoint->RegisterMethodHandler("discovery::NewComponent",
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bind_weak(&DiscoveryComponent::NewComponentMessageHandler, shared_from_this()));
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m_DiscoveryEndpoint->RegisterMethodHandler("discovery::Welcome",
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bind_weak(&DiscoveryComponent::WelcomeMessageHandler, shared_from_this()));
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GetEndpointManager()->ForEachEndpoint(bind(&DiscoveryComponent::NewEndpointHandler, this, _1));
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GetEndpointManager()->OnNewEndpoint += bind_weak(&DiscoveryComponent::NewEndpointHandler, shared_from_this());
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GetEndpointManager()->RegisterEndpoint(m_DiscoveryEndpoint);
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m_DiscoveryTimer = make_shared<Timer>();
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m_DiscoveryTimer->SetInterval(30);
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m_DiscoveryTimer->OnTimerExpired += bind_weak(&DiscoveryComponent::DiscoveryTimerHandler, shared_from_this());
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m_DiscoveryTimer->Start();
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}
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void DiscoveryComponent::Stop(void)
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{
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EndpointManager::Ptr mgr = GetEndpointManager();
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if (mgr)
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mgr->UnregisterEndpoint(m_DiscoveryEndpoint);
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}
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int DiscoveryComponent::CheckExistingEndpoint(Endpoint::Ptr endpoint, const NewEndpointEventArgs& neea)
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{
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if (endpoint == neea.Endpoint)
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return 0;
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if (!neea.Endpoint->IsConnected())
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return 0;
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if (endpoint->GetIdentity() == neea.Endpoint->GetIdentity()) {
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Application::Log("Detected duplicate identity (" + endpoint->GetIdentity() + " - Disconnecting old endpoint.");
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neea.Endpoint->Stop();
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GetEndpointManager()->UnregisterEndpoint(neea.Endpoint);
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}
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return 0;
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}
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int DiscoveryComponent::NewEndpointHandler(const NewEndpointEventArgs& neea)
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{
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neea.Endpoint->OnIdentityChanged += bind_weak(&DiscoveryComponent::NewIdentityHandler, shared_from_this());
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if (IsBroker()) {
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/* accept discovery::RegisterComponent messages from any endpoint */
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neea.Endpoint->RegisterMethodSource("discovery::RegisterComponent");
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}
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/* accept discovery::Welcome messages from any endpoint */
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neea.Endpoint->RegisterMethodSource("discovery::Welcome");
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return 0;
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}
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int DiscoveryComponent::DiscoverySinkHandler(const NewMethodEventArgs& nmea, ComponentDiscoveryInfo::Ptr info) const
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{
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info->SubscribedMethods.insert(nmea.Method);
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return 0;
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}
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int DiscoveryComponent::DiscoverySourceHandler(const NewMethodEventArgs& nmea, ComponentDiscoveryInfo::Ptr info) const
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{
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info->PublishedMethods.insert(nmea.Method);
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return 0;
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}
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int DiscoveryComponent::DiscoveryEndpointHandler(const NewEndpointEventArgs& neea, ComponentDiscoveryInfo::Ptr info) const
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{
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neea.Endpoint->ForEachMethodSink(bind(&DiscoveryComponent::DiscoverySinkHandler, this, _1, info));
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neea.Endpoint->ForEachMethodSource(bind(&DiscoveryComponent::DiscoverySourceHandler, this, _1, info));
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return 0;
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}
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bool DiscoveryComponent::GetComponentDiscoveryInfo(string component, ComponentDiscoveryInfo::Ptr *info) const
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{
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if (component == GetEndpointManager()->GetIdentity()) {
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/* Build fake discovery info for ourselves */
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*info = make_shared<ComponentDiscoveryInfo>();
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GetEndpointManager()->ForEachEndpoint(bind(&DiscoveryComponent::DiscoveryEndpointHandler, this, _1, *info));
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(*info)->LastSeen = 0;
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(*info)->Node = GetIcingaApplication()->GetNode();
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(*info)->Service = GetIcingaApplication()->GetService();
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return true;
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}
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map<string, ComponentDiscoveryInfo::Ptr>::const_iterator i;
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i = m_Components.find(component);
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if (i == m_Components.end())
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return false;
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*info = i->second;
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return true;
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}
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bool DiscoveryComponent::IsBroker(void) const
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{
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return m_Broker;
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}
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int DiscoveryComponent::NewIdentityHandler(const EventArgs& ea)
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{
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Endpoint::Ptr endpoint = static_pointer_cast<Endpoint>(ea.Source);
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string identity = endpoint->GetIdentity();
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if (!GetIcingaApplication()->IsDebugging()) {
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if (identity == GetEndpointManager()->GetIdentity()) {
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Application::Log("Detected loop-back connection - Disconnecting endpoint.");
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endpoint->Stop();
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GetEndpointManager()->UnregisterEndpoint(endpoint);
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return 0;
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}
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GetEndpointManager()->ForEachEndpoint(bind(&DiscoveryComponent::CheckExistingEndpoint, this, endpoint, _1));
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}
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ConfigCollection::Ptr brokerCollection = GetApplication()->GetConfigHive()->GetCollection("broker");
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if (brokerCollection->GetObject(identity)) {
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/* accept discovery::NewComponent messages from brokers */
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endpoint->RegisterMethodSource("discovery::NewComponent");
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}
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// we assume the other component _always_ wants
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// discovery::RegisterComponent messages from us
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endpoint->RegisterMethodSink("discovery::RegisterComponent");
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// send a discovery::RegisterComponent message, if the
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// other component is a broker this makes sure
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// the broker knows about our message types
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SendDiscoveryMessage("discovery::RegisterComponent", GetEndpointManager()->GetIdentity(), endpoint);
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map<string, ComponentDiscoveryInfo::Ptr>::iterator i;
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if (IsBroker()) {
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// we assume the other component _always_ wants
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// discovery::NewComponent messages from us
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endpoint->RegisterMethodSink("discovery::NewComponent");
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// send discovery::NewComponent message for ourselves
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SendDiscoveryMessage("discovery::NewComponent", GetEndpointManager()->GetIdentity(), endpoint);
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// send discovery::NewComponent messages for all components
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// we know about
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for (i = m_Components.begin(); i != m_Components.end(); i++) {
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SendDiscoveryMessage("discovery::NewComponent", i->first, endpoint);
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}
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}
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// check if we already know the other component
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i = m_Components.find(endpoint->GetIdentity());
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if (i == m_Components.end()) {
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// we don't know the other component yet, so
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// wait until we get a discovery::NewComponent message
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// from a broker
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return 0;
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}
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FinishDiscoverySetup(endpoint);
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return 0;
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}
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int DiscoveryComponent::WelcomeMessageHandler(const NewRequestEventArgs& nrea)
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{
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Endpoint::Ptr endpoint = nrea.Sender;
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if (endpoint->GetReceivedWelcome())
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return 0;
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endpoint->SetReceivedWelcome(true);
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if (endpoint->GetSentWelcome()) {
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EventArgs ea;
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ea.Source = shared_from_this();
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endpoint->OnSessionEstablished(ea);
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}
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return 0;
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}
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void DiscoveryComponent::FinishDiscoverySetup(Endpoint::Ptr endpoint)
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{
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if (endpoint->GetSentWelcome())
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return;
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// we assume the other component _always_ wants
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// discovery::Welcome messages from us
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endpoint->RegisterMethodSink("discovery::Welcome");
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JsonRpcRequest request;
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request.SetMethod("discovery::Welcome");
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GetEndpointManager()->SendUnicastRequest(m_DiscoveryEndpoint, endpoint, request);
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endpoint->SetSentWelcome(true);
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ComponentDiscoveryInfo::Ptr info;
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if (GetComponentDiscoveryInfo(endpoint->GetIdentity(), &info)) {
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set<string>::iterator i;
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for (i = info->PublishedMethods.begin(); i != info->PublishedMethods.end(); i++)
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endpoint->RegisterMethodSource(*i);
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for (i = info->SubscribedMethods.begin(); i != info->SubscribedMethods.end(); i++)
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endpoint->RegisterMethodSink(*i);
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}
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if (endpoint->GetReceivedWelcome()) {
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EventArgs ea;
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ea.Source = shared_from_this();
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endpoint->OnSessionEstablished(ea);
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}
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}
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void DiscoveryComponent::SendDiscoveryMessage(string method, string identity, Endpoint::Ptr recipient)
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{
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JsonRpcRequest request;
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request.SetMethod(method);
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DiscoveryMessage params;
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request.SetParams(params);
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params.SetIdentity(identity);
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Message subscriptions;
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params.SetSubscribes(subscriptions);
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Message publications;
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params.SetProvides(publications);
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ComponentDiscoveryInfo::Ptr info;
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if (!GetComponentDiscoveryInfo(identity, &info))
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return;
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if (!info->Node.empty() && !info->Service.empty()) {
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params.SetNode(info->Node);
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params.SetService(info->Service);
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}
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set<string>::iterator i;
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for (i = info->PublishedMethods.begin(); i != info->PublishedMethods.end(); i++)
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publications.AddUnnamedPropertyString(*i);
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for (i = info->SubscribedMethods.begin(); i != info->SubscribedMethods.end(); i++)
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subscriptions.AddUnnamedPropertyString(*i);
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if (recipient)
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GetEndpointManager()->SendUnicastRequest(m_DiscoveryEndpoint, recipient, request);
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else
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GetEndpointManager()->SendMulticastRequest(m_DiscoveryEndpoint, request);
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}
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void DiscoveryComponent::ProcessDiscoveryMessage(string identity, DiscoveryMessage message)
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{
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/* ignore discovery messages that are about ourselves */
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if (identity == GetEndpointManager()->GetIdentity())
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return;
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ComponentDiscoveryInfo::Ptr info = make_shared<ComponentDiscoveryInfo>();
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time(&(info->LastSeen));
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message.GetNode(&info->Node);
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message.GetService(&info->Service);
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Message provides;
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if (message.GetProvides(&provides)) {
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DictionaryIterator i;
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for (i = provides.GetDictionary()->Begin(); i != provides.GetDictionary()->End(); i++) {
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if (IsBroker()) {
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/* TODO: Add authorisation checks here */
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}
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info->PublishedMethods.insert(i->second);
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}
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}
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Message subscribes;
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if (message.GetSubscribes(&subscribes)) {
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DictionaryIterator i;
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for (i = subscribes.GetDictionary()->Begin(); i != subscribes.GetDictionary()->End(); i++) {
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if (IsBroker()) {
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/* TODO: Add authorisation checks here */
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}
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info->SubscribedMethods.insert(i->second);
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}
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}
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map<string, ComponentDiscoveryInfo::Ptr>::iterator i;
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i = m_Components.find(identity);
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if (i != m_Components.end())
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m_Components.erase(i);
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m_Components[identity] = info;
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if (IsBroker())
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SendDiscoveryMessage("discovery::NewComponent", identity, Endpoint::Ptr());
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Endpoint::Ptr endpoint = GetEndpointManager()->GetEndpointByIdentity(identity);
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if (endpoint)
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FinishDiscoverySetup(endpoint);
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}
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int DiscoveryComponent::NewComponentMessageHandler(const NewRequestEventArgs& nrea)
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{
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DiscoveryMessage message;
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nrea.Request.GetParams(&message);
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string identity;
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if (!message.GetIdentity(&identity))
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return 0;
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ProcessDiscoveryMessage(identity, message);
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return 0;
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}
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int DiscoveryComponent::RegisterComponentMessageHandler(const NewRequestEventArgs& nrea)
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{
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/* ignore discovery::RegisterComponent messages when we're not a broker */
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if (!IsBroker())
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return 0;
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DiscoveryMessage message;
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nrea.Request.GetParams(&message);
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ProcessDiscoveryMessage(nrea.Sender->GetIdentity(), message);
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return 0;
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}
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int DiscoveryComponent::BrokerConfigHandler(const EventArgs& ea)
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{
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ConfigObject::Ptr object = static_pointer_cast<ConfigObject>(ea.Source);
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EndpointManager::Ptr endpointManager = GetEndpointManager();
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/* Check if we're already connected to this broker. */
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if (endpointManager->GetEndpointByIdentity(object->GetName()))
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return 0;
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string node;
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if (!object->GetPropertyString("node", &node))
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throw InvalidArgumentException("'node' property required for 'broker' config object.");
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string service;
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if (!object->GetPropertyString("service", &service))
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throw InvalidArgumentException("'service' property required for 'broker' config object.");
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/* reconnect to this broker */
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endpointManager->AddConnection(node, service);
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return 0;
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}
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int DiscoveryComponent::DiscoveryTimerHandler(const TimerEventArgs& tea)
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{
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EndpointManager::Ptr endpointManager = GetEndpointManager();
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time_t now;
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time(&now);
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ConfigCollection::Ptr brokerCollection = GetApplication()->GetConfigHive()->GetCollection("broker");
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brokerCollection->ForEachObject(bind(&DiscoveryComponent::BrokerConfigHandler, this, _1));
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map<string, ComponentDiscoveryInfo::Ptr>::iterator i;
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for (i = m_Components.begin(); i != m_Components.end(); ) {
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string identity = i->first;
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ComponentDiscoveryInfo::Ptr info = i->second;
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if (info->LastSeen < now - DiscoveryComponent::RegistrationTTL) {
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/* unregister this component if its registration has expired */
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i = m_Components.erase(i);
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continue;
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}
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if (IsBroker()) {
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/* send discovery message to all connected components to
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refresh their TTL for this component */
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SendDiscoveryMessage("discovery::NewComponent", i->first, Endpoint::Ptr());
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}
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Endpoint::Ptr endpoint = endpointManager->GetEndpointByIdentity(identity);
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if (endpoint) {
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/* update LastSeen if we're still connected to this endpoint */
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info->LastSeen = now;
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} else {
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/* TODO: figure out whether we actually want to connect to this component (_always_ if IsBroker() == true) */
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/* try and reconnect to this component */
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endpointManager->AddConnection(info->Node, info->Service);
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}
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i++;
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}
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return 0;
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}
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EXPORT_COMPONENT(DiscoveryComponent);
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