How to use HandleClientRequest method of Microsoft.Coyote.Samples.CloudMessaging.SetupServerEvent class

Best Coyote code snippet using Microsoft.Coyote.Samples.CloudMessaging.SetupServerEvent.HandleClientRequest

Server.cs

Source:Server.cs

...104        [OnEventDoAction(typeof(TimerElapsedEvent), nameof(HandleTimeout))]105        [IgnoreEvents(typeof(ClientRequestEvent), typeof(ClientResponseEvent))]106        private class Candidate : State { }107        [OnEntry(nameof(BecomeLeader))]108        [OnEventDoAction(typeof(ClientRequestEvent), nameof(HandleClientRequest))]109        [OnEventDoAction(typeof(VoteRequestEvent), nameof(VoteRequest))]110        [OnEventDoAction(typeof(VoteResponseEvent), nameof(VoteResponse))]111        [OnEventDoAction(typeof(AppendLogEntriesRequestEvent), nameof(AppendLogEntriesRequest))]112        [OnEventDoAction(typeof(AppendLogEntriesResponseEvent), nameof(AppendLogEntriesResponse))]113        [IgnoreEvents(typeof(TimerElapsedEvent), typeof(ClientResponseEvent))]114        private class Leader : State { }115        /// <summary>116        /// Asynchronous callback that is invoked when the server is initialized.117        /// </summary>>118        protected override Task OnInitializeAsync(Event initialEvent)119        {120            var setupEvent = initialEvent as SetupServerEvent;121            this.Manager = setupEvent.ServerManager;122            this.ClusterManager = setupEvent.ClusterManager;123            this.CurrentTerm = 0;124            this.CommitIndex = 0;125            this.LastApplied = 0;126            this.VotedFor = string.Empty;127            this.Logs = new List<Log>();128            this.NextIndex = new Dictionary<string, int>();129            this.MatchIndex = new Dictionary<string, int>();130            this.HandledClientRequests = new HashSet<string>();131            return Task.CompletedTask;132        }133        private void StartTimer()134        {135            if (this.LeaderElectionTimer is null)136            {137                // Start a periodic leader election timer.138                this.LeaderElectionTimer = this.StartPeriodicTimer(this.Manager.LeaderElectionDueTime,139                    this.Manager.LeaderElectionPeriod);140            }141        }142        /// <summary>143        /// Asynchronous callback that initializes the server upon144        /// transition to a new role.145        /// </summary>146        private void BecomeFollower()147        {148            this.StartTimer();149            this.VotesReceived = 0;150        }151        private void BecomeCandidate()152        {153            this.StartTimer();154            this.CurrentTerm++;155            this.VotedFor = this.Manager.ServerId;156            this.VotesReceived = 1;157            var lastLogIndex = this.Logs.Count;158            var lastLogTerm = lastLogIndex > 0 ? this.Logs[lastLogIndex - 1].Term : 0;159            this.SendEvent(this.ClusterManager, new VoteRequestEvent(this.CurrentTerm, this.Manager.ServerId, lastLogIndex, lastLogTerm));160            this.Logger.WriteLine($"<VoteRequest> {this.Manager.ServerId} sent vote request " +161                $"(term={this.CurrentTerm}, lastLogIndex={lastLogIndex}, lastLogTerm={lastLogTerm}).");162        }163        private void BecomeLeader()164        {165            this.Manager.NotifyElectedLeader(this.CurrentTerm);166            var logIndex = this.Logs.Count;167            var logTerm = logIndex > 0 ? this.Logs[logIndex - 1].Term : 0;168            this.NextIndex.Clear();169            this.MatchIndex.Clear();170            foreach (var serverId in this.Manager.RemoteServerIds)171            {172                this.NextIndex.Add(serverId, logIndex + 1);173                this.MatchIndex.Add(serverId, 0);174            }175            foreach (var serverId in this.Manager.RemoteServerIds)176            {177                this.SendEvent(this.ClusterManager, new AppendLogEntriesRequestEvent(serverId, this.Manager.ServerId, this.CurrentTerm, logIndex,178                    logTerm, new List<Log>(), this.CommitIndex, string.Empty));179                this.Logger.WriteLine($"<AppendLogEntriesRequest> {this.Manager.ServerId} new leader sent append " +180                    $"entries request to {serverId} (term={this.CurrentTerm}, " +181                    $"prevLogIndex={logIndex}, prevLogTerm={logTerm}, " +182                    $"#entries=0, leaderCommit={this.CommitIndex})");183            }184        }185        /// <summary>186        /// Handle the received <see cref="VoteRequestEvent"/> by voting based187        /// on the current role of the Raft server.188        /// </summary>189        private void VoteRequest(Event e)190        {191            var request = e as VoteRequestEvent;192            this.Logger.WriteLine($"<VoteRequest> {this.Manager.ServerId} received vote request from " +193                $"{request.CandidateId} (term={request.Term}, lastLogIndex={request.LastLogIndex}, " +194                $"lastLogTerm={request.LastLogTerm}).");195            if (request.Term > this.CurrentTerm)196            {197                this.CurrentTerm = request.Term;198                this.VotedFor = string.Empty;199                if (this.CurrentState == typeof(Candidate) || this.CurrentState == typeof(Leader))200                {201                    if (this.CurrentState == typeof(Leader))202                    {203                        this.Logger.WriteLine($"<Leader> {this.Manager.ServerId} is relinquishing leadership because VoteRequest term is {request.Term}");204                    }205                    this.RaiseGotoStateEvent<Follower>();206                }207            }208            var lastLogIndex = this.Logs.Count;209            var lastLogTerm = lastLogIndex > 0 ? this.Logs[lastLogIndex - 1].Term : 0;210            bool voteGranted = false;211            if ((this.VotedFor.Length == 0 || this.VotedFor == request.CandidateId) &&212                request.Term >= this.CurrentTerm && lastLogIndex <= request.LastLogIndex &&213                lastLogTerm <= request.LastLogTerm)214            {215                this.VotedFor = request.CandidateId;216                voteGranted = true;217            }218            this.SendEvent(this.ClusterManager, new VoteResponseEvent(request.CandidateId, this.CurrentTerm, voteGranted));219            this.Logger.WriteLine($"<VoteResponse> {this.Manager.ServerId} sent vote response " +220                $"(term={this.CurrentTerm}, log={this.Logs.Count}, vote={voteGranted}).");221        }222        /// <summary>223        /// Handle the received <see cref="VoteResponseEvent"/> based on the current role224        /// of the Raft server. If the server is in the <see cref="Candidate"/> role, and225        /// receives a vote majority, then it is elected as leader.226        /// </summary>227        private void VoteResponse(Event e)228        {229            var response = e as VoteResponseEvent;230            this.Logger.WriteLine($"<VoteResponse> {this.Manager.ServerId} received vote response " +231                $"(term={response.Term}, vote-granted={response.VoteGranted}).");232            if (response.Term > this.CurrentTerm)233            {234                this.CurrentTerm = response.Term;235                this.VotedFor = string.Empty;236                if (this.CurrentState == typeof(Candidate) || this.CurrentState == typeof(Leader))237                {238                    if (this.CurrentState == typeof(Leader))239                    {240                        this.Logger.WriteLine($"<Leader> {this.Manager.ServerId} is relinquishing leadership because VoteResponseEvent term is {response.Term}");241                    }242                    this.RaiseGotoStateEvent<Follower>();243                }244            }245            else if (this.CurrentState == typeof(Candidate) &&246                response.Term == this.CurrentTerm && response.VoteGranted)247            {248                this.VotesReceived++;249                if (this.VotesReceived >= (this.Manager.NumServers / 2) + 1)250                {251                    // A new leader is elected.252                    this.Logger.WriteLine($"<LeaderElection> {this.Manager.ServerId} was elected leader " +253                        $"(term={this.CurrentTerm}, #votes={this.VotesReceived}, log={this.Logs.Count}).");254                    this.VotesReceived = 0;255                    this.RaiseGotoStateEvent<Leader>();256                }257            }258        }259        /// <summary>260        /// Handle the received <see cref="AppendLogEntriesRequestEvent"/> based on261        /// the current role of the Raft server.262        /// </summary>263        private void AppendLogEntriesRequest(Event e)264        {265            var request = e as AppendLogEntriesRequestEvent;266            this.Logger.WriteLine($"<AppendLogEntriesRequest> {this.Manager.ServerId} received append " +267                $"entries request (term={request.Term}, leader={request.LeaderId}, " +268                $"prevLogIndex={request.PrevLogIndex}, prevLogTerm={request.PrevLogTerm}, " +269                $"#entries={request.Entries.Count}, leaderCommit={request.LeaderCommit})");270            bool appendEntries = this.CurrentState == typeof(Follower) ||271                this.CurrentState == typeof(Candidate);272            if (request.Term > this.CurrentTerm)273            {274                this.CurrentTerm = request.Term;275                this.VotedFor = string.Empty;276                if (this.CurrentState == typeof(Candidate))277                {278                    this.RaiseGotoStateEvent<Follower>();279                }280                else if (this.CurrentState == typeof(Leader))281                {282                    this.Logger.WriteLine($"<Leader> {this.Manager.ServerId} is relinquishing leadership because AppendLogEntriesRequestEvent term is {request.Term}");283                    appendEntries = true;284                    this.RaiseGotoStateEvent<Follower>();285                }286            }287            if (appendEntries)288            {289                if (request.Term < this.CurrentTerm)290                {291                    this.SendEvent(this.ClusterManager, new AppendLogEntriesResponseEvent(request.LeaderId, this.Manager.ServerId, this.CurrentTerm, false, request.Command));292                    this.Logger.WriteLine($"<AppendLogEntriesResponse> {this.Manager.ServerId} sent append " +293                        $"entries response (term={this.CurrentTerm}, log={this.Logs.Count}, " +294                        $"last-applied={this.LastApplied}, append=false[<term]) in state {this.CurrentState.Name}.");295                }296                else297                {298                    if (request.PrevLogIndex > 0 &&299                        (this.Logs.Count < request.PrevLogIndex ||300                        this.Logs[request.PrevLogIndex - 1].Term != request.PrevLogTerm))301                    {302                        this.SendEvent(this.ClusterManager, new AppendLogEntriesResponseEvent(request.LeaderId, this.Manager.ServerId, this.CurrentTerm, false, request.Command));303                        this.Logger.WriteLine($"<AppendLogEntriesResponse> {this.Manager.ServerId} sent append " +304                            $"entries response (term={this.CurrentTerm}, log={this.Logs.Count}, " +305                            $"last-applied={this.LastApplied}, append=false[missing]) in state {this.CurrentState.Name}.");306                    }307                    else308                    {309                        if (request.Entries.Count > 0)310                        {311                            var currentIndex = request.PrevLogIndex + 1;312                            foreach (var entry in request.Entries)313                            {314                                if (this.Logs.Count < currentIndex)315                                {316                                    this.Logs.Add(entry);317                                }318                                else if (this.Logs[currentIndex - 1].Term != entry.Term)319                                {320                                    this.Logs.RemoveRange(currentIndex - 1, this.Logs.Count - (currentIndex - 1));321                                    this.Logs.Add(entry);322                                }323                                currentIndex++;324                            }325                        }326                        if (request.LeaderCommit > this.CommitIndex &&327                            this.Logs.Count < request.LeaderCommit)328                        {329                            this.CommitIndex = this.Logs.Count;330                        }331                        else if (request.LeaderCommit > this.CommitIndex)332                        {333                            this.CommitIndex = request.LeaderCommit;334                        }335                        if (this.CommitIndex > this.LastApplied)336                        {337                            this.LastApplied++;338                        }339                        this.SendEvent(this.ClusterManager, new AppendLogEntriesResponseEvent(request.LeaderId, this.Manager.ServerId, this.CurrentTerm, true, request.Command));340                        this.Logger.WriteLine($"<AppendLogEntriesResponse> {this.Manager.ServerId} sent append " +341                            $"entries response (term={this.CurrentTerm}, log={this.Logs.Count}, " +342                            $"entries-received={request.Entries.Count}, last-applied={this.LastApplied}, " +343                            $"append=true) in state {this.CurrentState.Name}.");344                    }345                }346            }347        }348        /// <summary>349        /// Handle the received <see cref="AppendLogEntriesResponseEvent"/> based on350        /// the current role of the Raft server.351        /// </summary>352        private void AppendLogEntriesResponse(Event e)353        {354            var response = e as AppendLogEntriesResponseEvent;355            this.Logger.WriteLine($"<AppendLogEntriesResponse> {this.Manager.ServerId} received append entries " +356                $"response from {response.SenderId} (term={response.Term}, success={response.Success}) in state {this.CurrentState.Name}");357            if (response.Term > this.CurrentTerm)358            {359                this.CurrentTerm = response.Term;360                this.VotedFor = string.Empty;361                if (this.CurrentState == typeof(Candidate) || this.CurrentState == typeof(Leader))362                {363                    if (this.CurrentState == typeof(Leader))364                    {365                        this.Logger.WriteLine($"<Leader> {this.Manager.ServerId} is relinquishing leadership because AppendLogEntriesResponseEvent term is {response.Term}");366                    }367                    this.RaiseGotoStateEvent<Follower>();368                }369            }370            else if (this.CurrentState == typeof(Leader) && response.Term == this.CurrentTerm)371            {372                if (response.Success)373                {374                    this.NextIndex[response.SenderId] = this.Logs.Count + 1;375                    this.MatchIndex[response.SenderId] = this.Logs.Count;376                    this.LogVotesReceived++;377                    if (response.Command.Length > 0 &&378                        this.LogVotesReceived >= (this.Manager.NumServers / 2) + 1)379                    {380                        var commitIndex = this.MatchIndex[response.SenderId];381                        if (commitIndex > this.CommitIndex &&382                            this.Logs[commitIndex - 1].Term == this.CurrentTerm)383                        {384                            this.CommitIndex = commitIndex;385                        }386                        this.LogVotesReceived = 0;387                        this.HandledClientRequests.Add(response.Command);388                        this.SendEvent(this.ClusterManager, new ClientResponseEvent(response.Command, this.Manager.ServerId));389                        this.Logger.WriteLine($"<ClientResponse> {this.Manager.ServerId} sent " +390                            $"client response (command={response.Command})");391                    }392                    else393                    {394                        this.Logger.WriteLine($"<Leader> {this.Manager.ServerId} has {this.LogVotesReceived} of max possible {this.Manager.NumServers} on command {response.Command}");395                    }396                }397                else398                {399                    if (this.NextIndex[response.SenderId] > 1)400                    {401                        this.NextIndex[response.SenderId] = this.NextIndex[response.SenderId] - 1;402                    }403                    var entries = this.Logs.GetRange(this.NextIndex[response.SenderId] - 1, this.Logs.Count - (this.NextIndex[response.SenderId] - 1));404                    var prevLogIndex = this.NextIndex[response.SenderId] - 1;405                    var prevLogTerm = prevLogIndex > 0 ? this.Logs[prevLogIndex - 1].Term : 0;406                    this.SendEvent(this.ClusterManager, new AppendLogEntriesRequestEvent(response.SenderId, this.Manager.ServerId, this.CurrentTerm, prevLogIndex,407                        prevLogTerm, entries, this.CommitIndex, response.Command));408                    this.Logger.WriteLine($"<AppendLogEntriesRequest> {this.Manager.ServerId} sent append " +409                        $"entries request to {response.SenderId} (term={this.CurrentTerm}, " +410                        $"prevLogIndex={prevLogIndex}, prevLogTerm={prevLogTerm}, " +411                        $"#entries={entries.Count}, leaderCommit={this.CommitIndex})");412                }413            }414        }415        /// <summary>416        /// Handle the received <see cref="ClientRequestEvent"/>.417        /// </summary>418        private void HandleClientRequest(Event e)419        {420            var clientRequest = e as ClientRequestEvent;421            if (this.HandledClientRequests.Contains(clientRequest.Command))422            {423                return;424            }425            this.Logger.WriteLine($"<ClientRequest> {this.Manager.ServerId} received " +426                $"client request (command={clientRequest.Command})");427            // Append the command to the log.428            this.Logs.Add(new Log(this.CurrentTerm, clientRequest.Command));429            this.LogVotesReceived = 1;430            // Replicate the new log entries out to each remote server then wait for a majority of nodes to431            // respond with AppendLogEntriesResponseEvent before deciding if we can commit this new log entry432            // and then send the ClientResponseEvent....

HandleClientRequest

Using AI Code Generation

1using Microsoft.Coyote;2using Microsoft.Coyote.Samples.CloudMessaging;3{4    {5        static void Main(string[] args)6        {7            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.SetupServerEvent));8            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent));9            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent_1));10            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent_2));11            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent_3));12            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent_4));13            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent_5));14            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent_6));15            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent_7));16            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent_8));17            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent_9));18            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent_10));19            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent_11));20            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent_12));21            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent_13));22            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent_14));23            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent_15));24            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent_16));25            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent_17));26            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent_18));27            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent_19));28            Runtime.RegisterMonitor(typeof(Microsoft.Coyote.Samples.CloudMessaging.HandleClientRequestEvent_20));

HandleClientRequest

Using AI Code Generation

1using Microsoft.Coyote.Samples.CloudMessaging;2using System;3using System.Collections.Generic;4using System.Text;5using System.Threading.Tasks;6{7    {8        public static void Main(string[] args)9        {10            var server = new SetupServerEvent();11            server.HandleClientRequest();12        }13        public void HandleClientRequest()14        {15            var client = new ClientEvent();16            client.HandleRequest();17        }18    }19}20using Microsoft.Coyote.Samples.CloudMessaging;21using System;22using System.Collections.Generic;23using System.Text;24using System.Threading.Tasks;25{26    {27        public static void Main(string[] args)28        {29            var client = new ClientEvent();30            client.HandleRequest();31        }32        public void HandleRequest()33        {34            var request = new RequestEvent();35            request.HandleRequest();36        }37    }38}39using Microsoft.Coyote.Samples.CloudMessaging;40using System;41using System.Collections.Generic;42using System.Text;43using System.Threading.Tasks;44{45    {46        public static void Main(string[] args)47        {48            var request = new RequestEvent();49            request.HandleRequest();50        }51        public void HandleRequest()52        {53            var response = new ResponseEvent();54            response.HandleResponse();55        }56    }57}58using Microsoft.Coyote.Samples.CloudMessaging;59using System;60using System.Collections.Generic;61using System.Text;62using System.Threading.Tasks;63{64    {65        public static void Main(string[] args)66        {67            var response = new ResponseEvent();68            response.HandleResponse();69        }70        public void HandleResponse()71        {72            var response = new ResponseEvent();73            response.HandleResponse();74        }75    }76}77using Microsoft.Coyote.Samples.CloudMessaging;78using System;79using System.Collections.Generic;

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