public override CanInstallSnapshotResponse Handle(CanInstallSnapshotRequest req)
{
if (_installingSnapshot == null)
{
return base.Handle(req);
}
return new CanInstallSnapshotResponse
{
From = Engine.Name,
ClusterTopologyId = Engine.CurrentTopology.TopologyId,
IsCurrentlyInstalling = true,
Message = "The node is in the process of installing a snapshot",
Success = false
};
}
public void Send(NodeConnectionInfo dest, CanInstallSnapshotRequest req)
{
_sender.Send(dest, req);
}
public virtual CanInstallSnapshotResponse Handle(CanInstallSnapshotRequest req)
{
var lastLogEntry = Engine.PersistentState.LastLogEntry();
var index = lastLogEntry.Index;
if (FromOurTopology(req) == false)
{
_log.Info("Got a can install snapshot message outside my cluster topology (id: {0}), ignoring", req.ClusterTopologyId);
return new CanInstallSnapshotResponse
{
From = Engine.Name,
ClusterTopologyId = Engine.CurrentTopology.TopologyId,
IsCurrentlyInstalling = false,
Message = "Cannot install a snapshot from a node outside my topoloyg. My topology id is: " + req.ClusterTopologyId,
Success = false,
Index = index,
Term = Engine.PersistentState.CurrentTerm
};
}
if (req.Term <= Engine.PersistentState.CurrentTerm && req.Index <= index)
{
return new CanInstallSnapshotResponse
{
From = Engine.Name,
ClusterTopologyId = Engine.CurrentTopology.TopologyId,
IsCurrentlyInstalling = false,
Message = String.Format("Term or Index do not match the ones on this node. Cannot install snapshot. (CurrentTerm = {0}, req.Term = {1}, LastLogEntry index = {2}, req.Index = {3}",
Engine.PersistentState.CurrentTerm, req.Term, index, req.Index),
Success = false,
Index = index,
Term = Engine.PersistentState.CurrentTerm
};
}
Engine.SetState(RaftEngineState.SnapshotInstallation);
return new CanInstallSnapshotResponse
{
From = Engine.Name,
ClusterTopologyId = Engine.CurrentTopology.TopologyId,
IsCurrentlyInstalling = false,
Message = "Everything ok, go ahead, install the snapshot!",
Success = true
};
}
public void Send(NodeConnectionInfo dest, CanInstallSnapshotRequest req)
{
HttpClient client;
using (GetConnection(dest, out client))
{
LogStatus("can install snapshot to " + dest, async () =>
{
var requestUri = string.Format("raft/canInstallSnapshot?term={0}&=index{1}&from={2}&clusterTopologyId={3}", req.Term, req.Index,
req.From, req.ClusterTopologyId);
var httpResponseMessage = await client.GetAsync(requestUri);
var reply = await httpResponseMessage.Content.ReadAsStringAsync();
if (httpResponseMessage.IsSuccessStatusCode == false && httpResponseMessage.StatusCode != HttpStatusCode.NotAcceptable)
{
_log.Warn("Error checking if can install snapshot to {0}. Status: {1}\r\n{2}", dest.Name, httpResponseMessage.StatusCode, reply);
return;
}
var canInstallSnapshotResponse = JsonConvert.DeserializeObject<CanInstallSnapshotResponse>(reply);
SendToSelf(canInstallSnapshotResponse);
});
}
}
