public void SetNextState(ServiceFabricAutopilotAgentState nextState, bool toIgnoreStateTransitionWhenStopping = true)
{
lock (this.StatusLock)
{
if (toIgnoreStateTransitionWhenStopping && this.State < ServiceFabricAutopilotAgentState.Started)
{
TextLogger.LogVerbose("Application is stopping. Ignore state transition request to {0}.", nextState);
return;
}
TextLogger.LogInfo("State transition: {0} -> {1}", this.State, nextState);
this.State = nextState;
}
}
private bool ComputeNextStateFromManagingNetworkConfigurationState(out ServiceFabricAutopilotAgentState nextState)
{
nextState = ServiceFabricAutopilotAgentState.None;
try
{
bool serviceFabricNodeConfigurationCompleted = Utilities.IsWindowsFabricNodeConfigurationCompleted(false);
TextLogger.LogInfo("Service Fabric node configuration completed locally : {0}.", serviceFabricNodeConfigurationCompleted);
if (!serviceFabricNodeConfigurationCompleted)
{
nextState = ServiceFabricAutopilotAgentState.InstallingProduct;
}
else
{
ServiceController fabricHostService = this.localNodeManager.GetInstalledService(Constants.FabricHostServiceName);
if (fabricHostService == null)
{
// TODO: consider assert instead of an error message
TextLogger.LogError("Service Fabric node configuration has completed locally while Fabric host service does not exist.");
return(false);
}
if (fabricHostService.Status != ServiceControllerStatus.Running)
{
nextState = ServiceFabricAutopilotAgentState.StartingNode;
}
else
{
nextState = ServiceFabricAutopilotAgentState.NodeStarted;
}
}
return(true);
}
catch (Exception e)
{
TextLogger.LogError("Failed to compute next state from {0} state : {1}", ServiceFabricAutopilotAgentState.ManagingNetworkConfiguration, e);
return(false);
}
}
private bool RunStateMachineCore(ServiceFabricAutopilotAgentState currentState)
{
TextLogger.LogInfo("Starting RunStateMachineCore. Current state : {0}.", currentState);
switch (currentState)
{
case ServiceFabricAutopilotAgentState.ManagingNetworkConfiguration:
{
if (!this.localNodeManager.ManageNetworkConfiguration())
{
return(false);
}
ServiceFabricAutopilotAgentState nextState;
if (!this.ComputeNextStateFromManagingNetworkConfigurationState(out nextState))
{
return(false);
}
this.agentStatus.SetNextState(nextState);
break;
}
case ServiceFabricAutopilotAgentState.InstallingProduct:
{
if (!this.localNodeManager.InstallProduct())
{
return(false);
}
// For now, we assume the topology is static.
// TODO: when adding dynamic topology support, change state machine transition here.
this.agentStatus.SetNextState(ServiceFabricAutopilotAgentState.DiscoveringTopology);
break;
}
case ServiceFabricAutopilotAgentState.DiscoveringTopology:
{
ClusterTopology expectedTopology;
if (!this.localNodeManager.DiscoverTopology(out expectedTopology))
{
return(false);
}
lock (this.agentStatus.StatusLock)
{
this.agentStatus.ExpectedTopology = expectedTopology;
this.agentStatus.ExpectedTopologyRunning = false;
}
this.agentStatus.SetNextState(ServiceFabricAutopilotAgentState.ConfiguringNode);
break;
}
case ServiceFabricAutopilotAgentState.ConfiguringNode:
{
ClusterTopology topologyToDeploy = this.agentStatus.GetTopologyToDeploy();
if (!this.localNodeManager.ConfigureLocalNode(topologyToDeploy))
{
return(false);
}
lock (this.agentStatus.StatusLock)
{
this.agentStatus.DeployedTopology = topologyToDeploy;
this.agentStatus.ExpectedTopologyRunning = !this.agentStatus.DeployedTopology.IsClusterTopologyChanged(this.agentStatus.ExpectedTopology);
}
this.agentStatus.SetNextState(ServiceFabricAutopilotAgentState.StartingNode);
break;
}
case ServiceFabricAutopilotAgentState.StartingNode:
{
if (!this.localNodeManager.StartLocalNode())
{
return(false);
}
this.agentStatus.SetNextState(ServiceFabricAutopilotAgentState.NodeStarted);
break;
}
case ServiceFabricAutopilotAgentState.NodeStarted:
{
// TODO: this only applies when DynamicTopologyUpdateMode == None or OnNodeConfigurationOnly.
// When we want to update topology whenever topology changes, this needs to change.
lock (this.agentStatus.StatusLock)
{
this.agentStatus.ExpectedTopologyRunning = true;
this.agentStatus.ExpectedTopology = ClusterTopology.GetClusterTopology();
this.agentStatus.DeployedTopology = this.agentStatus.ExpectedTopology;
}
break;
}
}
return(true);
}
