public async Task CreatesSnapshotAsALeader()
{
_settings.MinSnapshottingIndexInterval = 10L;
_manijer.Setup(x => x.GetPeers()).Returns(new[] { "1", "3", "5", "7" }.Select(s => new Peer(s, Guid.NewGuid())));
_manijer.Setup(x => x.GetProxy(It.IsAny <string>())).Returns(_mockPeer.Object);
_mockPeer.Setup(x => x.RequestVoteAsync(It.IsAny <RequestVoteRequest>())).ReturnsAsync(
new RequestVoteResponse()
{
CurrentTerm = 0,
VoteGranted = true
}
);
_mockPeer.Setup(x => x.AppendEntriesAsync(It.IsAny <AppendEntriesRequest>())).ReturnsAsync(
new AppendEntriesResponse(1, true)
);
_server = new DefaultRaftServer(_sister, _sister, _sister, _maqina.Object, _manijer.Object, _settings);
_server.LastHeartBeat = new AlwaysOldTimestamp();
_server.Start();
Thread.Sleep(1000); // must be a leader by now
Assert.Equal(Role.Leader, _server.Role);
for (var i = 0; i < 15; i++)
{
await _server.ApplyCommandAsync(new StateMachineCommandRequest()
{
Command = new byte[128]
});
}
Thread.Sleep(3000);
_mockPeer.VerifyAll();
}
public async Task LeadsFollowersAndTheirLogsLikeALeader()
{
var list = new ConcurrentBag <FriendlyPeer>();
_manijer.Setup(x => x.GetPeers()).Returns(new[] { "1", "3", "5", "7" }.Select(s => new Peer(s, Guid.NewGuid())));
_manijer.Setup(x => x.GetProxy(It.IsAny <string>())).Returns(
() => {
var s = new FriendlyPeer();
list.Add(s);
return(s);
}
);
_server = new DefaultRaftServer(_sister, _sister, _sister, _maqina.Object, _manijer.Object, _settings);
_server.LastHeartBeat = new AlwaysOldTimestamp();
_server.Start();
Thread.Sleep(2000); // must be a leader by now
Assert.Equal(Role.Leader, _server.Role);
await _server.ApplyCommandAsync(new StateMachineCommandRequest()
{
Command = new byte[128]
});
await _server.ApplyCommandAsync(new StateMachineCommandRequest()
{
Command = new byte[128]
});
await _server.ApplyCommandAsync(new StateMachineCommandRequest()
{
Command = new byte[128]
});
Thread.Sleep(2000);
var timesFollowersServed = list.SelectMany(x => {
var copy = x.AllThemAppendEntriesRequests.ToArray();
return(copy.Where(y => y.Entries.Length > 0));
}).Count();
_output.WriteLine($"timesFollowersServed: {timesFollowersServed}");
Assert.True(timesFollowersServed > 1);
Assert.Equal(2, _sister.LastIndex);
}
public async Task LeaderSendsSnapshotForAClientSoBehind()
{
_settings.MinSnapshottingIndexInterval = 10L;
_maqina.Setup(x => x.WriteSnapshotAsync(It.IsAny <Stream>()))
.Callback(async(Stream s) => s.Write(new byte[256], 0, 256)).Returns(Task.CompletedTask);
var term = 1L;
_manijer.Setup(x => x.GetPeers()).Returns(new[] { "1", "3", "5", "7" }.Select(s => new Peer(s, Guid.NewGuid())));
_manijer.Setup(x => x.GetProxy(It.Is <string>(s => s != "1"))).Returns(_mockPeer.Object);
var behindPeer = new Mock <IRaftServer>();
_manijer.Setup(x => x.GetProxy(It.Is <string>(s => s == "1"))).Returns(behindPeer.Object);
_mockPeer.Setup(x => x.RequestVoteAsync(It.IsAny <RequestVoteRequest>())).ReturnsAsync(
new RequestVoteResponse()
{
CurrentTerm = term,
VoteGranted = true
}
);
behindPeer.Setup(x => x.RequestVoteAsync(It.IsAny <RequestVoteRequest>())).ReturnsAsync(
new RequestVoteResponse()
{
CurrentTerm = term,
VoteGranted = true
}
);
_mockPeer.Setup(x => x.AppendEntriesAsync(It.IsAny <AppendEntriesRequest>())).ReturnsAsync(
new AppendEntriesResponse(term, true)
);
// unsuccessful response to append entry so that it is left behind
behindPeer.Setup(x => x.AppendEntriesAsync(It.Is <AppendEntriesRequest>(
req => req.Entries.Length > 0
))).ReturnsAsync(
new AppendEntriesResponse(term, false)
);
// but success to heartbeat
behindPeer.Setup(x => x.AppendEntriesAsync(It.Is <AppendEntriesRequest>(
req => req.Entries.Length == 0
))).ReturnsAsync(
new AppendEntriesResponse(term, true)
);
// should be called for installing snapshot
behindPeer.Setup(x => x.InstallSnapshotAsync(It.Is <InstallSnapshotRequest>(req =>
req.CurrentTerm == term && req.LastIncludedIndex == 14
))).ReturnsAsync(
new InstallSnapshotResponse()
{
CurrentTerm = term
}
);
_server = new DefaultRaftServer(_sister, _sister, _sister, _maqina.Object, _manijer.Object, _settings);
_server.LastHeartBeat = new AlwaysOldTimestamp();
_server.Start();
Thread.Sleep(1000); // must be a leader by now
Assert.Equal(Role.Leader, _server.Role);
for (var i = 0; i < 15; i++)
{
await _server.ApplyCommandAsync(new StateMachineCommandRequest()
{
Command = new byte[128]
});
}
Thread.Sleep(3000);
_mockPeer.VerifyAll();
behindPeer.VerifyAll();
}