public Task SendClusterConfigurationAsync(ClusterConfiguration configuration)
{
try
{
var command = ClusterConfigurationUpdateCommand.Create(configuration);
raftEngine.AppendCommand(command);
return(command.Completion.Task);
}
catch (NotLeadingException)
{
return(SendClusterConfigurationInternalAsync(raftEngine.GetLeaderNode(WaitForLeaderTimeoutInSeconds), configuration));
}
}
public async Task <HttpResponseMessage> Read([FromUri] string key, [FromUri] string mode = null)
{
switch (mode)
{
case "quorum":
var taskCompletionSource = new TaskCompletionSource <object>();
try
{
RaftEngine.AppendCommand(new GetCommand
{
Key = key,
Completion = taskCompletionSource
});
}
catch (NotLeadingException e)
{
return(RedirectToLeader(e.CurrentLeader, Request.RequestUri));
}
var consistentRead = await taskCompletionSource.Task;
return(Request.CreateResponse(HttpStatusCode.OK, new
{
RaftEngine.State,
Key = key,
Value = consistentRead,
Missing = consistentRead == null
}));
case "leader":
if (RaftEngine.State != RaftEngineState.Leader)
{
return(RedirectToLeader(RaftEngine.CurrentLeader, Request.RequestUri));
}
goto case null;
case "any":
case null:
var read = StateMachine.Read(key);
return(Request.CreateResponse(HttpStatusCode.OK, new
{
RaftEngine.State,
Key = key,
Value = read,
Missing = read == null
}));
default:
return(Request.CreateResponse(HttpStatusCode.BadRequest, new
{
Error = "Unknown read mode"
}));
}
}
private async Task <HttpResponseMessage> Batch(KeyValueOperation[] operations)
{
var taskCompletionSource = new TaskCompletionSource <object>();
try
{
RaftEngine.AppendCommand(new OperationBatchCommand
{
Batch = operations,
Completion = taskCompletionSource
});
}
catch (NotLeadingException e)
{
return(RedirectToLeader(e.CurrentLeader, Request.RequestUri));
}
await taskCompletionSource.Task;
return(Request.CreateResponse(HttpStatusCode.Accepted));
}