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How to use ExitAsync method of PuppeteerSharp.States.KillingState class

Best Puppeteer-sharp code snippet using PuppeteerSharp.States.KillingState.ExitAsync

ChromiumProcess.cs

Source:ChromiumProcess.cs

...137        /// Kills the Chromium process if it has not exited within this period.138        /// </summary>139        /// <param name="timeout">The maximum waiting time for a graceful process exit.</param>140        /// <returns></returns>141        public Task EnsureExitAsync(TimeSpan? timeout) => timeout.HasValue142            ? _currentState.ExitAsync(this, timeout.Value)143            : _currentState.KillAsync(this);144        /// <summary>145        /// Asynchronously kills Chromium process.146        /// </summary>147        /// <returns></returns>148        public Task KillAsync() => _currentState.KillAsync(this);149        /// <summary>150        /// Waits for Chromium process exit within a given timeout.151        /// </summary>152        /// <param name="timeout">The maximum wait period.</param>153        /// <returns><c>true</c> if Chromium process has exited within the given <paramref name="timeout"/>,154        /// or <c>false</c> otherwise.</returns>155        public async Task<bool> WaitForExitAsync(TimeSpan? timeout)156        {157            if (timeout.HasValue)158            {159                var taskCompleted = true;160                await _exitCompletionSource.Task.WithTimeout(() =>161                {162                    taskCompleted = false;163                }, timeout.Value).ConfigureAwait(false);164                return taskCompleted;165            }166            await _exitCompletionSource.Task.ConfigureAwait(false);167            return true;168        }169        /// <inheritdoc />170        public override string ToString() => $"Chromium process; EndPoint={EndPoint}; State={_currentState}";171        #endregion172        #region Private methods173        private static (List<string> chromiumArgs, TempDirectory tempUserDataDir) PrepareChromiumArgs(LaunchOptions options)174        {175            var chromiumArgs = new List<string>();176            if (!options.IgnoreDefaultArgs)177            {178                chromiumArgs.AddRange(GetDefaultArgs(options));179            }180            else if (options.IgnoredDefaultArgs?.Length > 0)181            {182                chromiumArgs.AddRange(GetDefaultArgs(options).Except(options.IgnoredDefaultArgs));183            }184            else185            {186                chromiumArgs.AddRange(options.Args);187            }188            TempDirectory tempUserDataDir = null;189            if (!chromiumArgs.Any(argument => argument.StartsWith("--remote-debugging-", StringComparison.Ordinal)))190            {191                chromiumArgs.Add("--remote-debugging-port=0");192            }193            var userDataDirOption = chromiumArgs.FirstOrDefault(i => i.StartsWith(UserDataDirArgument, StringComparison.Ordinal));194            if (string.IsNullOrEmpty(userDataDirOption))195            {196                tempUserDataDir = new TempDirectory();197                chromiumArgs.Add($"{UserDataDirArgument}={tempUserDataDir.Path.Quote()}");198            }199            return (chromiumArgs, tempUserDataDir);200        }201        internal static string[] GetDefaultArgs(LaunchOptions options)202        {203            var chromeArguments = new List<string>(DefaultArgs);204            if (!string.IsNullOrEmpty(options.UserDataDir))205            {206                chromeArguments.Add($"{UserDataDirArgument}={options.UserDataDir.Quote()}");207            }208            if (options.Devtools)209            {210                chromeArguments.Add("--auto-open-devtools-for-tabs");211            }212            if (options.Headless)213            {214                chromeArguments.AddRange(new[]{215                    "--headless",216                    "--hide-scrollbars",217                    "--mute-audio"218                });219            }220            if (options.Args.All(arg => arg.StartsWith("-", StringComparison.Ordinal)))221            {222                chromeArguments.Add("about:blank");223            }224            chromeArguments.AddRange(options.Args);225            return chromeArguments.ToArray();226        }227        private static void SetEnvVariables(IDictionary<string, string> environment, IDictionary<string, string> customEnv, IDictionary realEnv)228        {229            foreach (DictionaryEntry item in realEnv)230            {231                environment[item.Key.ToString()] = item.Value.ToString();232            }233            if (customEnv != null)234            {235                foreach (var item in customEnv)236                {237                    environment[item.Key] = item.Value;238                }239            }240        }241        #endregion242        #region State machine243        /// <summary>244        /// Represents state machine for Chromium process instances. The happy path runs along the245        /// following state transitions: <see cref="Initial"/>246        /// -> <see cref="Starting"/>247        /// -> <see cref="Started"/>248        /// -> <see cref="Exiting"/>249        /// -> <see cref="Exited"/>.250        /// -> <see cref="Disposed"/>.251        /// </summary>252        /// <remarks>253        /// <para>254        /// This state machine implements the following state transitions:255        /// <code>256        /// State     Event              Target State Action257        /// ======== =================== ============ ==========================================================258        /// Initial  --StartAsync------> Starting     Start process and wait for endpoint259        /// Initial  --ExitAsync-------> Exited       Cleanup temp user data260        /// Initial  --KillAsync-------> Exited       Cleanup temp user data261        /// Initial  --Dispose---------> Disposed     Cleanup temp user data262        /// Starting --StartAsync------> Starting     -263        /// Starting --ExitAsync-------> Exiting      Wait for process exit264        /// Starting --KillAsync-------> Killing      Kill process265        /// Starting --Dispose---------> Disposed     Kill process; Cleanup temp user data;  throw ObjectDisposedException on outstanding async operations;266        /// Starting --endpoint ready--> Started      Complete StartAsync successfully; Log process start267        /// Starting --process exit----> Exited       Complete StartAsync with exception; Cleanup temp user data268        /// Started  --StartAsync------> Started      -269        /// Started  --EnsureExitAsync-> Exiting      Start exit timer; Log process exit270        /// Started  --KillAsync-------> Killing      Kill process; Log process exit271        /// Started  --Dispose---------> Disposed     Kill process; Log process exit; Cleanup temp user data; throw ObjectDisposedException on outstanding async operations;272        /// Started  --process exit----> Exited       Log process exit; Cleanup temp user data273        /// Exiting  --StartAsync------> Exiting      - (StartAsync throws InvalidOperationException)274        /// Exiting  --ExitAsync-------> Exiting      -275        /// Exiting  --KillAsync-------> Killing      Kill process276        /// Exiting  --Dispose---------> Disposed     Kill process; Cleanup temp user data; throw ObjectDisposedException on outstanding async operations;277        /// Exiting  --exit timeout----> Killing      Kill process278        /// Exiting  --process exit----> Exited       Cleanup temp user data; complete outstanding async operations;279        /// Killing  --StartAsync------> Killing      - (StartAsync throws InvalidOperationException)280        /// Killing  --KillAsync-------> Killing      -281        /// Killing  --Dispose---------> Disposed     Cleanup temp user data; throw ObjectDisposedException on outstanding async operations;282        /// Killing  --process exit----> Exited       Cleanup temp user data; complete outstanding async operations;283        /// Exited   --StartAsync------> Killing      - (StartAsync throws InvalidOperationException)284        /// Exited   --KillAsync-------> Exited       -285        /// Exited   --Dispose---------> Disposed     -286        /// Disposed --StartAsync------> Disposed     -287        /// Disposed --KillAsync-------> Disposed     -288        /// Disposed --Dispose---------> Disposed     -289        /// </code>290        /// </para>291        /// </remarks>292        private abstract class State293        {294            #region Predefined states295            public static readonly State Initial = new InitialState();296            private static readonly StartingState Starting = new StartingState();297            private static readonly StartedState Started = new StartedState();298            private static readonly ExitingState Exiting = new ExitingState();299            private static readonly KillingState Killing = new KillingState();300            private static readonly ExitedState Exited = new ExitedState();301            private static readonly DisposedState Disposed = new DisposedState();302            #endregion303            #region Properties304            public bool IsExiting => this == Killing || this == Exiting;305            public bool IsExited => this == Exited || this == Disposed;306            #endregion307            #region Methods308            /// <summary>309            /// Attempts thread-safe transitions from a given state to this state.310            /// </summary>311            /// <param name="p">The Chromium process</param>312            /// <param name="fromState">The state from which state transition takes place</param>313            /// <returns>Returns <c>true</c> if transition is successful, or <c>false</c> if transition314            /// cannot be made because current state does not equal <paramref name="fromState"/>.</returns>315            protected bool TryEnter(ChromiumProcess p, State fromState)316            {317                if (Interlocked.CompareExchange(ref p._currentState, this, fromState) == fromState)318                {319                    fromState.Leave(p);320                    return true;321                }322                return false;323            }324            /// <summary>325            /// Notifies that state machine is about to transition to another state.326            /// </summary>327            /// <param name="p">The Chromium process</param>328            protected virtual void Leave(ChromiumProcess p)329            { }330            /// <summary>331            /// Handles process start request.332            /// </summary>333            /// <param name="p">The Chromium process</param>334            /// <returns></returns>335            public virtual Task StartAsync(ChromiumProcess p) => Task.FromException(InvalidOperation("start"));336            /// <summary>337            /// Handles process exit request.338            /// </summary>339            /// <param name="p">The Chromium process</param>340            /// <param name="timeout">The maximum waiting time for a graceful process exit.</param>341            /// <returns></returns>342            public virtual Task ExitAsync(ChromiumProcess p, TimeSpan timeout) => Task.FromException(InvalidOperation("exit"));343            /// <summary>344            /// Handles process kill request.345            /// </summary>346            /// <param name="p">The Chromium process</param>347            /// <returns></returns>348            public virtual Task KillAsync(ChromiumProcess p) => Task.FromException(InvalidOperation("kill"));349            /// <summary>350            /// Handles wait for process exit request.351            /// </summary>352            /// <param name="p">The Chromium process</param>353            /// <returns></returns>354            public virtual Task WaitForExitAsync(ChromiumProcess p) => p._exitCompletionSource.Task;355            /// <summary>356            /// Handles disposal of process and temporary user directory357            /// </summary>358            /// <param name="p"></param>359            public virtual void Dispose(ChromiumProcess p) => Disposed.EnterFrom(p, this);360            public override string ToString()361            {362                var name = GetType().Name;363                return name.Substring(0, name.Length - "State".Length);364            }365            private Exception InvalidOperation(string operationName)366                => new InvalidOperationException($"Cannot {operationName} in state {this}");367            /// <summary>368            /// Kills process if it is still alive.369            /// </summary>370            /// <param name="p"></param>371            private static void Kill(ChromiumProcess p)372            {373                try374                {375                    if (!p.Process.HasExited)376                    {377                        p.Process.Kill();378                    }379                }380                catch (InvalidOperationException)381                {382                    // Ignore383                }384            }385            #endregion386            #region Concrete state classes387            private class InitialState : State388            {389                public override Task StartAsync(ChromiumProcess p) => Starting.EnterFromAsync(p, this);390                public override Task ExitAsync(ChromiumProcess p, TimeSpan timeout)391                {392                    Exited.EnterFrom(p, this);393                    return Task.CompletedTask;394                }395                public override Task KillAsync(ChromiumProcess p)396                {397                    Exited.EnterFrom(p, this);398                    return Task.CompletedTask;399                }400                public override Task WaitForExitAsync(ChromiumProcess p) => Task.FromException(InvalidOperation("wait for exit"));401            }402            private class StartingState : State403            {404                public Task EnterFromAsync(ChromiumProcess p, State fromState)405                {406                    if (!TryEnter(p, fromState))407                    {408                        // Delegate StartAsync to current state, because it has already changed since409                        // transition to this state was initiated.410                        return p._currentState.StartAsync(p);411                    }412                    return StartCoreAsync(p);413                }414                public override Task StartAsync(ChromiumProcess p) => p._startCompletionSource.Task;415                public override Task ExitAsync(ChromiumProcess p, TimeSpan timeout) => Exiting.EnterFromAsync(p, this, timeout);416                public override Task KillAsync(ChromiumProcess p) => Killing.EnterFromAsync(p, this);417                public override void Dispose(ChromiumProcess p)418                {419                    p._startCompletionSource.TrySetException(new ObjectDisposedException(p.ToString()));420                    base.Dispose(p);421                }422                private async Task StartCoreAsync(ChromiumProcess p)423                {424                    var output = new StringBuilder();425                    void OnProcessDataReceivedWhileStarting(object sender, DataReceivedEventArgs e)426                    {427                        if (e.Data != null)428                        {429                            output.AppendLine(e.Data);430                            var match = Regex.Match(e.Data, "^DevTools listening on (ws:\\/\\/.*)");431                            if (match.Success)432                            {433                                p._startCompletionSource.TrySetResult(match.Groups[1].Value);434                            }435                        }436                    }437                    void OnProcessExitedWhileStarting(object sender, EventArgs e)438                        => p._startCompletionSource.TrySetException(new ChromiumProcessException($"Failed to launch Chromium! {output}"));439                    void OnProcessExited(object sender, EventArgs e) => Exited.EnterFrom(p, p._currentState);440                    p.Process.ErrorDataReceived += OnProcessDataReceivedWhileStarting;441                    p.Process.Exited += OnProcessExitedWhileStarting;442                    p.Process.Exited += OnProcessExited;443                    CancellationTokenSource cts = null;444                    try445                    {446                        p.Process.Start();447                        await Started.EnterFromAsync(p, this).ConfigureAwait(false);448                        p.Process.BeginErrorReadLine();449                        var timeout = p._options.Timeout;450                        if (timeout > 0)451                        {452                            cts = new CancellationTokenSource(timeout);453                            cts.Token.Register(() => p._startCompletionSource.TrySetException(454                                new ChromiumProcessException($"Timed out after {timeout} ms while trying to connect to Chromium!")));455                        }456                        try457                        {458                            await p._startCompletionSource.Task.ConfigureAwait(false);459                            await Started.EnterFromAsync(p, this).ConfigureAwait(false);460                        }461                        catch462                        {463                            await Killing.EnterFromAsync(p, this).ConfigureAwait(false);464                            throw;465                        }466                    }467                    finally468                    {469                        cts?.Dispose();470                        p.Process.Exited -= OnProcessExitedWhileStarting;471                        p.Process.ErrorDataReceived -= OnProcessDataReceivedWhileStarting;472                    }473                }474            }475            private class StartedState : State476            {477                public Task EnterFromAsync(ChromiumProcess p, State fromState)478                {479                    if (TryEnter(p, fromState))480                    {481                        // Process has not exited or been killed since transition to this state was initiated482                        LogProcessCount(p, Interlocked.Increment(ref _processCount));483                    }484                    return Task.CompletedTask;485                }486                protected override void Leave(ChromiumProcess p)487                    => LogProcessCount(p, Interlocked.Decrement(ref _processCount));488                public override Task StartAsync(ChromiumProcess p) => Task.CompletedTask;489                public override Task ExitAsync(ChromiumProcess p, TimeSpan timeout) => Exiting.EnterFromAsync(p, this, timeout);490                public override Task KillAsync(ChromiumProcess p) => Killing.EnterFromAsync(p, this);491                private static void LogProcessCount(ChromiumProcess p, int processCount)492                {493                    try494                    {495                        p._logger?.LogInformation("Process Count: {ProcessCount}", processCount);496                    }497                    catch498                    {499                        // Prevent logging exception from causing havoc500                    }501                }502            }503            private class ExitingState : State504            {505                public Task EnterFromAsync(ChromiumProcess p, State fromState, TimeSpan timeout)506                    => !TryEnter(p, fromState) ? p._currentState.ExitAsync(p, timeout) : ExitAsync(p, timeout);507                public override async Task ExitAsync(ChromiumProcess p, TimeSpan timeout)508                {509                    var waitForExitTask = WaitForExitAsync(p);510                    await waitForExitTask.WithTimeout(async () =>511                    {512                        await Killing.EnterFromAsync(p, this).ConfigureAwait(false);513                        await waitForExitTask.ConfigureAwait(false);514                    }, timeout).ConfigureAwait(false);515                }516                public override Task KillAsync(ChromiumProcess p) => Killing.EnterFromAsync(p, this);517            }518            private class KillingState : State519            {520                public async Task EnterFromAsync(ChromiumProcess p, State fromState)521                {522                    if (!TryEnter(p, fromState))523                    {524                        // Delegate KillAsync to current state, because it has already changed since525                        // transition to this state was initiated.526                        await p._currentState.KillAsync(p).ConfigureAwait(false);527                    }528                    try529                    {530                        if (!p.Process.HasExited)531                        {532                            p.Process.Kill();533                        }534                    }535                    catch (InvalidOperationException)536                    {537                        // Ignore538                        return;539                    }540                    await WaitForExitAsync(p).ConfigureAwait(false);541                }542                public override Task ExitAsync(ChromiumProcess p, TimeSpan timeout) => WaitForExitAsync(p);543                public override Task KillAsync(ChromiumProcess p) => WaitForExitAsync(p);544            }545            private class ExitedState : State546            {547                public void EnterFrom(ChromiumProcess p, State fromState)548                {549                    while (!TryEnter(p, fromState))550                    {551                        // Current state has changed since transition to this state was requested.552                        // Therefore retry transition to this state from the current state. This ensures553                        // that Leave() operation of current state is properly called.554                        fromState = p._currentState;555                        if (fromState == this)556                        {557                            return;558                        }559                    }560                    p._exitCompletionSource.TrySetResult(true);561                    p._tempUserDataDir?.Dispose();562                }563                public override Task ExitAsync(ChromiumProcess p, TimeSpan timeout) => Task.CompletedTask;564                public override Task KillAsync(ChromiumProcess p) => Task.CompletedTask;565                public override Task WaitForExitAsync(ChromiumProcess p) => Task.CompletedTask;566            }567            private class DisposedState : State568            {569                public void EnterFrom(ChromiumProcess p, State fromState)570                {571                    if (!TryEnter(p, fromState))572                    {573                        // Delegate Dispose to current state, because it has already changed since574                        // transition to this state was initiated.575                        p._currentState.Dispose(p);576                    }577                    else if (fromState != Exited)578                    {579                        Kill(p);580                        p._exitCompletionSource.TrySetException(new ObjectDisposedException(p.ToString()));581                        p._tempUserDataDir?.Dispose();582                    }583                }584                public override Task StartAsync(ChromiumProcess p) => throw new ObjectDisposedException(p.ToString());585                public override Task ExitAsync(ChromiumProcess p, TimeSpan timeout) => throw new ObjectDisposedException(p.ToString());586                public override Task KillAsync(ChromiumProcess p) => throw new ObjectDisposedException(p.ToString());587                public override void Dispose(ChromiumProcess p)588                {589                    // Nothing to do590                }591            }592            #endregion593        }594        #endregion595    }596}...

LauncherBase.cs

Source:LauncherBase.cs

...101        /// Kills the Base process if it has not exited within this period.102        /// </summary>103        /// <param name="timeout">The maximum waiting time for a graceful process exit.</param>104        /// <returns></returns>105        public Task EnsureExitAsync(TimeSpan? timeout) => timeout.HasValue106            ? _currentState.ExitAsync(this, timeout.Value)107            : _currentState.KillAsync(this);108        /// <summary>109        /// Asynchronously kills Base process.110        /// </summary>111        /// <returns></returns>112        public Task KillAsync() => _currentState.KillAsync(this);113        /// <summary>114        /// Waits for Base process exit within a given timeout.115        /// </summary>116        /// <param name="timeout">The maximum wait period.</param>117        /// <returns><c>true</c> if Base process has exited within the given <paramref name="timeout"/>,118        /// or <c>false</c> otherwise.</returns>119        public async Task<bool> WaitForExitAsync(TimeSpan? timeout)120        {121            if (timeout.HasValue)122            {123                bool taskCompleted = true;124                await _exitCompletionSource.Task.WithTimeout(125                    () =>126                    {127                        taskCompleted = false;128                    }, timeout.Value).ConfigureAwait(false);129                return taskCompleted;130            }131            await _exitCompletionSource.Task.ConfigureAwait(false);132            return true;133        }134        #endregion135        #region Private methods136        /// <summary>137        /// Set Env Variables138        /// </summary>139        /// <param name="environment">The environment.</param>140        /// <param name="customEnv">The customEnv.</param>141        /// <param name="realEnv">The realEnv.</param>142        protected static void SetEnvVariables(IDictionary<string, string> environment, IDictionary<string, string> customEnv, IDictionary realEnv)143        {144            foreach (DictionaryEntry item in realEnv)145            {146                environment[item.Key.ToString()] = item.Value.ToString();147            }148            if (customEnv != null)149            {150                foreach (var item in customEnv)151                {152                    environment[item.Key] = item.Value;153                }154            }155        }156        #endregion157        #region State machine158        /// <summary>159        /// Represents state machine for Base process instances. The happy path runs along the160        /// following state transitions: <see cref="Initial"/>161        /// -> <see cref="Starting"/>162        /// -> <see cref="Started"/>163        /// -> <see cref="Exiting"/>164        /// -> <see cref="Exited"/>.165        /// -> <see cref="Disposed"/>.166        /// </summary>167        /// <remarks>168        /// <para>169        /// This state machine implements the following state transitions:170        /// <code>171        /// State     Event              Target State Action172        /// ======== =================== ============ ==========================================================173        /// Initial  --StartAsync------> Starting     Start process and wait for endpoint174        /// Initial  --ExitAsync-------> Exited       Cleanup temp user data175        /// Initial  --KillAsync-------> Exited       Cleanup temp user data176        /// Initial  --Dispose---------> Disposed     Cleanup temp user data177        /// Starting --StartAsync------> Starting     -178        /// Starting --ExitAsync-------> Exiting      Wait for process exit179        /// Starting --KillAsync-------> Killing      Kill process180        /// Starting --Dispose---------> Disposed     Kill process; Cleanup temp user data;  throw ObjectDisposedException on outstanding async operations;181        /// Starting --endpoint ready--> Started      Complete StartAsync successfully; Log process start182        /// Starting --process exit----> Exited       Complete StartAsync with exception; Cleanup temp user data183        /// Started  --StartAsync------> Started      -184        /// Started  --EnsureExitAsync-> Exiting      Start exit timer; Log process exit185        /// Started  --KillAsync-------> Killing      Kill process; Log process exit186        /// Started  --Dispose---------> Disposed     Kill process; Log process exit; Cleanup temp user data; throw ObjectDisposedException on outstanding async operations;187        /// Started  --process exit----> Exited       Log process exit; Cleanup temp user data188        /// Exiting  --StartAsync------> Exiting      - (StartAsync throws InvalidOperationException)189        /// Exiting  --ExitAsync-------> Exiting      -190        /// Exiting  --KillAsync-------> Killing      Kill process191        /// Exiting  --Dispose---------> Disposed     Kill process; Cleanup temp user data; throw ObjectDisposedException on outstanding async operations;192        /// Exiting  --exit timeout----> Killing      Kill process193        /// Exiting  --process exit----> Exited       Cleanup temp user data; complete outstanding async operations;194        /// Killing  --StartAsync------> Killing      - (StartAsync throws InvalidOperationException)195        /// Killing  --KillAsync-------> Killing      -196        /// Killing  --Dispose---------> Disposed     Cleanup temp user data; throw ObjectDisposedException on outstanding async operations;197        /// Killing  --process exit----> Exited       Cleanup temp user data; complete outstanding async operations;198        /// Exited   --StartAsync------> Killing      - (StartAsync throws InvalidOperationException)199        /// Exited   --KillAsync-------> Exited       -200        /// Exited   --Dispose---------> Disposed     -201        /// Disposed --StartAsync------> Disposed     -202        /// Disposed --KillAsync-------> Disposed     -203        /// Disposed --Dispose---------> Disposed     -204        /// </code>205        /// </para>206        /// </remarks>207        protected abstract class State208        {209            #region Predefined states210            /// <summary>211            /// Set initial state.212            /// </summary>213            public static readonly State Initial = new InitialState();214            private static readonly StartingState Starting = new StartingState();215            private static readonly StartedState Started = new StartedState();216            private static readonly ExitingState Exiting = new ExitingState();217            private static readonly KillingState Killing = new KillingState();218            private static readonly ExitedState Exited = new ExitedState();219            private static readonly DisposedState Disposed = new DisposedState();220            #endregion221            #region Properties222            /// <summary>223            /// Get If process exists.224            /// </summary>225            public bool IsExiting => this == Killing || this == Exiting;226            /// <summary>227            /// Get If process is exited.228            /// </summary>229            public bool IsExited => this == Exited || this == Disposed;230            #endregion231            #region Methods232            /// <summary>233            /// Attempts thread-safe transitions from a given state to this state.234            /// </summary>235            /// <param name="p">The Base process</param>236            /// <param name="fromState">The state from which state transition takes place</param>237            /// <returns>Returns <c>true</c> if transition is successful, or <c>false</c> if transition238            /// cannot be made because current state does not equal <paramref name="fromState"/>.</returns>239            protected bool TryEnter(LauncherBase p, State fromState)240            {241                if (Interlocked.CompareExchange(ref p._currentState, this, fromState) == fromState)242                {243                    fromState.Leave(p);244                    return true;245                }246                return false;247            }248            /// <summary>249            /// Notifies that state machine is about to transition to another state.250            /// </summary>251            /// <param name="p">The Base process</param>252            protected virtual void Leave(LauncherBase p)253            {254            }255            /// <summary>256            /// Handles process start request.257            /// </summary>258            /// <param name="p">The Base process</param>259            /// <returns></returns>260            public virtual Task StartAsync(LauncherBase p) => Task.FromException(InvalidOperation("start"));261            /// <summary>262            /// Handles process exit request.263            /// </summary>264            /// <param name="p">The Base process</param>265            /// <param name="timeout">The maximum waiting time for a graceful process exit.</param>266            /// <returns></returns>267            public virtual Task ExitAsync(LauncherBase p, TimeSpan timeout) => Task.FromException(InvalidOperation("exit"));268            /// <summary>269            /// Handles process kill request.270            /// </summary>271            /// <param name="p">The Base process</param>272            /// <returns></returns>273            public virtual Task KillAsync(LauncherBase p) => Task.FromException(InvalidOperation("kill"));274            /// <summary>275            /// Handles wait for process exit request.276            /// </summary>277            /// <param name="p">The Base process</param>278            /// <returns></returns>279            public virtual Task WaitForExitAsync(LauncherBase p) => p._exitCompletionSource.Task;280            /// <summary>281            /// Handles disposal of process and temporary user directory282            /// </summary>283            /// <param name="p"></param>284            public virtual void Dispose(LauncherBase p) => Disposed.EnterFrom(p, this);285            /// <inheritdoc />286            public override string ToString()287            {288                string name = GetType().Name;289                return name.Substring(0, name.Length - "State".Length);290            }291            private Exception InvalidOperation(string operationName)292                => new InvalidOperationException($"Cannot {operationName} in state {this}");293            /// <summary>294            /// Kills process if it is still alive.295            /// </summary>296            /// <param name="p"></param>297            private static void Kill(LauncherBase p)298            {299                try300                {301                    if (!p.Process.HasExited)302                    {303                        p.Process.Kill();304                    }305                }306                catch (InvalidOperationException)307                {308                    // Ignore309                }310            }311            #endregion312            #region Concrete state classes313            private class InitialState : State314            {315                public override Task StartAsync(LauncherBase p) => Starting.EnterFromAsync(p, this);316                public override Task ExitAsync(LauncherBase p, TimeSpan timeout)317                {318                    Exited.EnterFrom(p, this);319                    return Task.CompletedTask;320                }321                public override Task KillAsync(LauncherBase p)322                {323                    Exited.EnterFrom(p, this);324                    return Task.CompletedTask;325                }326                public override Task WaitForExitAsync(LauncherBase p) => Task.FromException(InvalidOperation("wait for exit"));327            }328            private class StartingState : State329            {330                public Task EnterFromAsync(LauncherBase p, State fromState)331                {332                    if (!TryEnter(p, fromState))333                    {334                        // Delegate StartAsync to current state, because it has already changed since335                        // transition to this state was initiated.336                        return p._currentState.StartAsync(p);337                    }338                    return StartCoreAsync(p);339                }340                public override Task StartAsync(LauncherBase p) => p._startCompletionSource.Task;341                public override Task ExitAsync(LauncherBase p, TimeSpan timeout) => Exiting.EnterFromAsync(p, this, timeout);342                public override Task KillAsync(LauncherBase p) => Killing.EnterFromAsync(p, this);343                public override void Dispose(LauncherBase p)344                {345                    p._startCompletionSource.TrySetException(new ObjectDisposedException(p.ToString()));346                    base.Dispose(p);347                }348                private async Task StartCoreAsync(LauncherBase p)349                {350                    var output = new StringBuilder();351                    void OnProcessDataReceivedWhileStarting(object sender, DataReceivedEventArgs e)352                    {353                        if (e.Data != null)354                        {355                            output.AppendLine(e.Data);356                            var match = Regex.Match(e.Data, "^DevTools listening on (ws:\\/\\/.*)");357                            if (match.Success)358                            {359                                p._startCompletionSource.TrySetResult(match.Groups[1].Value);360                            }361                        }362                    }363                    void OnProcessExitedWhileStarting(object sender, EventArgs e)364                        => p._startCompletionSource.TrySetException(new ProcessException($"Failed to launch Base! {output}"));365                    void OnProcessExited(object sender, EventArgs e) => Exited.EnterFrom(p, p._currentState);366                    p.Process.ErrorDataReceived += OnProcessDataReceivedWhileStarting;367                    p.Process.Exited += OnProcessExitedWhileStarting;368                    p.Process.Exited += OnProcessExited;369                    CancellationTokenSource cts = null;370                    try371                    {372                        p.Process.Start();373                        await Started.EnterFromAsync(p, this).ConfigureAwait(false);374                        p.Process.BeginErrorReadLine();375                        int timeout = p._options.Timeout;376                        if (timeout > 0)377                        {378                            cts = new CancellationTokenSource(timeout);379                            cts.Token.Register(() => p._startCompletionSource.TrySetException(380                                new ProcessException($"Timed out after {timeout} ms while trying to connect to Base!")));381                        }382                        try383                        {384                            await p._startCompletionSource.Task.ConfigureAwait(false);385                            await Started.EnterFromAsync(p, this).ConfigureAwait(false);386                        }387                        catch388                        {389                            await Killing.EnterFromAsync(p, this).ConfigureAwait(false);390                            throw;391                        }392                    }393                    finally394                    {395                        cts?.Dispose();396                        p.Process.Exited -= OnProcessExitedWhileStarting;397                        p.Process.ErrorDataReceived -= OnProcessDataReceivedWhileStarting;398                    }399                }400            }401            private class StartedState : State402            {403                public Task EnterFromAsync(LauncherBase p, State fromState)404                {405                    if (TryEnter(p, fromState))406                    {407                    }408                    return Task.CompletedTask;409                }410                protected override void Leave(LauncherBase p) { }411                public override Task StartAsync(LauncherBase p) => Task.CompletedTask;412                public override Task ExitAsync(LauncherBase p, TimeSpan timeout) => Exiting.EnterFromAsync(p, this, timeout);413                public override Task KillAsync(LauncherBase p) => Killing.EnterFromAsync(p, this);414            }415            private class ExitingState : State416            {417                public Task EnterFromAsync(LauncherBase p, State fromState, TimeSpan timeout)418                    => !TryEnter(p, fromState) ? p._currentState.ExitAsync(p, timeout) : ExitAsync(p, timeout);419                public override async Task ExitAsync(LauncherBase p, TimeSpan timeout)420                {421                    var waitForExitTask = WaitForExitAsync(p);422                    await waitForExitTask.WithTimeout(423                        async () =>424                        {425                            await Killing.EnterFromAsync(p, this).ConfigureAwait(false);426                            await waitForExitTask.ConfigureAwait(false);427                        },428                        timeout,429                        CancellationToken.None).ConfigureAwait(false);430                }431                public override Task KillAsync(LauncherBase p) => Killing.EnterFromAsync(p, this);432            }433            private class KillingState : State434            {435                public async Task EnterFromAsync(LauncherBase p, State fromState)436                {437                    if (!TryEnter(p, fromState))438                    {439                        // Delegate KillAsync to current state, because it has already changed since440                        // transition to this state was initiated.441                        await p._currentState.KillAsync(p).ConfigureAwait(false);442                    }443                    try444                    {445                        if (!p.Process.HasExited)446                        {447                            p.Process.Kill();448                        }449                    }450                    catch (InvalidOperationException)451                    {452                        // Ignore453                        return;454                    }455                    await WaitForExitAsync(p).ConfigureAwait(false);456                }457                public override Task ExitAsync(LauncherBase p, TimeSpan timeout) => WaitForExitAsync(p);458                public override Task KillAsync(LauncherBase p) => WaitForExitAsync(p);459            }460            private class ExitedState : State461            {462                public void EnterFrom(LauncherBase p, State fromState)463                {464                    while (!TryEnter(p, fromState))465                    {466                        // Current state has changed since transition to this state was requested.467                        // Therefore retry transition to this state from the current state. This ensures468                        // that Leave() operation of current state is properly called.469                        fromState = p._currentState;470                        if (fromState == this)471                        {472                            return;473                        }474                    }475                    p._exitCompletionSource.TrySetResult(true);476                    p.TempUserDataDir?.Dispose();477                }478                public override Task ExitAsync(LauncherBase p, TimeSpan timeout) => Task.CompletedTask;479                public override Task KillAsync(LauncherBase p) => Task.CompletedTask;480                public override Task WaitForExitAsync(LauncherBase p) => Task.CompletedTask;481            }482            private class DisposedState : State483            {484                public void EnterFrom(LauncherBase p, State fromState)485                {486                    if (!TryEnter(p, fromState))487                    {488                        // Delegate Dispose to current state, because it has already changed since489                        // transition to this state was initiated.490                        p._currentState.Dispose(p);491                    }492                    else if (fromState != Exited)493                    {494                        Kill(p);495                        p._exitCompletionSource.TrySetException(new ObjectDisposedException(p.ToString()));496                        p.TempUserDataDir?.Dispose();497                    }498                }499                public override Task StartAsync(LauncherBase p) => throw new ObjectDisposedException(p.ToString());500                public override Task ExitAsync(LauncherBase p, TimeSpan timeout) => throw new ObjectDisposedException(p.ToString());501                public override Task KillAsync(LauncherBase p) => throw new ObjectDisposedException(p.ToString());502                public override void Dispose(LauncherBase p)503                {504                    // Nothing to do505                }506            }507            #endregion508        }509        #endregion510    }511}...

KillingState.cs

Source:KillingState.cs

...26            {27                // Ignore28                return;29            }30            await WaitForExitAsync(p).ConfigureAwait(false);31        }32        public override Task ExitAsync(LauncherBase p, TimeSpan timeout) => WaitForExitAsync(p);33        public override Task KillAsync(LauncherBase p) => WaitForExitAsync(p);34    }35}...

StartedState.cs

Source:StartedState.cs

...12            StateManager.TryEnter(p, fromState, this);13            return Task.CompletedTask;14        }15        public override Task StartAsync(LauncherBase p) => Task.CompletedTask;16        public override Task ExitAsync(LauncherBase p, TimeSpan timeout) => new ExitingState(StateManager).EnterFromAsync(p, this, timeout);17        public override Task KillAsync(LauncherBase p) => new KillingState(StateManager).EnterFromAsync(p, this);18    }19}...

ExitAsync

Using AI Code Generation

1{2    {3        public KillingState(Browser browser) : base(browser)4        {5        }6        public override Task ExitAsync()7        {8            return Task.CompletedTask;9        }10    }11}12{13    {14        public KillingState(Browser browser) : base(browser)15        {16        }17        public override Task ExitAsync()18        {19            return Task.CompletedTask;20        }21    }22}23{24    {25        public KillingState(Browser browser) : base(browser)26        {27        }28        public override Task ExitAsync()29        {30            return Task.CompletedTask;31        }32    }33}34{35    {36        public KillingState(Browser browser) : base(browser)37        {38        }39        public override Task ExitAsync()40        {41            return Task.CompletedTask;42        }43    }44}45{46    {47        public KillingState(Browser browser) : base(browser)48        {49        }50        public override Task ExitAsync()51        {52            return Task.CompletedTask;53        }54    }55}56{57    {58        public KillingState(Browser browser) : base(browser)59        {60        }61        public override Task ExitAsync()62        {63            return Task.CompletedTask;64        }65    }66}67{

ExitAsync

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5    {6        static void Main(string[] args)7        {8            MainAsync().GetAwaiter().GetResult();9        }10        static async Task MainAsync()11        {12            {13            };14            var browser = await Puppeteer.LaunchAsync(options);15            var page = await browser.NewPageAsync();16            await browser.CloseAsync();17            await browser.ExitAsync();18        }19    }20}21using System;22using System.Threading.Tasks;23using PuppeteerSharp;24{25    {26        static void Main(string[] args)27        {28            MainAsync().GetAwaiter().GetResult();29        }30        static async Task MainAsync()31        {32            {33            };34            var browser = await Puppeteer.LaunchAsync(options);35            var page = await browser.NewPageAsync();36            await browser.CloseAsync();37            await browser.KillAsync();38        }39    }40}41using System;42using System.Threading.Tasks;43using PuppeteerSharp;44{45    {46        static void Main(string[] args)47        {48            MainAsync().GetAwaiter().GetResult();49        }50        static async Task MainAsync()51        {52            {53            };54            var browser = await Puppeteer.LaunchAsync(options);55            var page = await browser.NewPageAsync();56            await browser.CloseAsync();57            await browser.KillAsync();58            await browser.KillAsync();59        }60    }61}62using System;63using System.Threading.Tasks;64using PuppeteerSharp;65{66    {67        static void Main(string[] args)68        {69            MainAsync().GetAwait

ExitAsync

Using AI Code Generation

1using PuppeteerSharp.States;2using System;3using System.Threading.Tasks;4{5    {6        static async Task Main(string[] args)7        {8            {9            };10            using (var browser = await Puppeteer.LaunchAsync(options))11            {12                var page = await browser.NewPageAsync();13                await browser.CloseAsync();14                await browser.KillingState.ExitAsync();15            }16        }17    }18}19using PuppeteerSharp.States;20using System;21using System.Threading.Tasks;22{23    {24        static async Task Main(string[] args)25        {26            {27            };28            using (var browser = await Puppeteer.LaunchAsync(options))29            {30                var page = await browser.NewPageAsync();31                await browser.CloseAsync();32                await browser.KillingState.KillAsync();33            }34        }35    }36}37using PuppeteerSharp.States;38using System;39using System.Threading.Tasks;40{41    {42        static async Task Main(string[] args)43        {44            {45            };46            using (var browser = await Puppeteer.LaunchAsync(options))47            {48                var page = await browser.NewPageAsync();49                await browser.CloseAsync();50                await browser.KillingState.KillTreeAsync();51            }52        }53    }54}55using PuppeteerSharp.States;56using System;57using System.Threading.Tasks;58{59    {60        static async Task Main(string[] args)61        {62            {

ExitAsync

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5    {6        public KillingState(Connection connection)7        {8            Connection = connection;9        }10        public Connection Connection { get; }11        public Task<bool> SendAsync(string method, dynamic args)12        {13            throw new InvalidOperationException("Connection is closed.");14        }15        public Task ExitAsync()16        {17            return Task.CompletedTask;18        }19    }20}21using System;22using System.Threading.Tasks;23using PuppeteerSharp;24{25    {26        public ClosingState(Connection connection)27        {28            Connection = connection;29        }30        public Connection Connection { get; }31        public Task<bool> SendAsync(string method, dynamic args)32        {33            throw new InvalidOperationException("Connection is closed.");34        }35        public Task ExitAsync()36        {37            return Task.CompletedTask;38        }39    }40}41using System;42using System.Threading.Tasks;43using PuppeteerSharp;44{45    {46        public ClosedState(Connection connection)47        {48            Connection = connection;49        }50        public Connection Connection { get; }51        public Task<bool> SendAsync(string method, dynamic args)52        {53            throw new InvalidOperationException("Connection is closed.");54        }55        public Task ExitAsync()56        {57            return Task.CompletedTask;58        }59    }60}61using System;62using System.Threading.Tasks;63using PuppeteerSharp;64{65    {66        public DisconnectedState(Connection connection)67        {68            Connection = connection;69        }70        public Connection Connection { get; }71        public Task<bool> SendAsync(string method, dynamic args)72        {73            throw new InvalidOperationException("Connection is closed.");74        }75        public Task ExitAsync()76        {77            return Task.CompletedTask;78        }79    }80}

ExitAsync

Using AI Code Generation

1var browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = true });2var page = await browser.NewPageAsync();3await browser.CloseAsync();4await browser.ExitAsync();5var browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = true });6var page = await browser.NewPageAsync();7await browser.ExitAsync();8var browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = true });9var page = await browser.NewPageAsync();10await browser.ExitAsync();11var browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = true });12var page = await browser.NewPageAsync();13await browser.ExitAsync();14var browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = true });15var page = await browser.NewPageAsync();16await browser.ExitAsync();17var browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = true });18var page = await browser.NewPageAsync();19await browser.ExitAsync();20var browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = true });

ExitAsync

Using AI Code Generation

1var page = await browser.NewPageAsync();2await page.CloseAsync();3var page = await browser.NewPageAsync();4await page.CloseAsync();5await browser.CloseAsync();6var page = await browser.NewPageAsync();7await page.CloseAsync();8await browser.CloseAsync();9var page = await browser.NewPageAsync();10await page.CloseAsync();11await browser.CloseAsync();12await browser.DisconnectAsync();13var page = await browser.NewPageAsync();14await page.CloseAsync();15await browser.CloseAsync();16await browser.DisconnectAsync();17await browser.CloseAsync();18var page = await browser.NewPageAsync();19await page.CloseAsync();20await browser.CloseAsync();21await browser.DisconnectAsync();22await browser.CloseAsync();23await browser.DisconnectAsync();24var page = await browser.NewPageAsync();25await page.CloseAsync();26await browser.CloseAsync();27await browser.DisconnectAsync();28await browser.CloseAsync();29await browser.DisconnectAsync();30await browser.DisposeAsync();31var page = await browser.NewPageAsync();32await page.CloseAsync();33await browser.CloseAsync();34await browser.DisconnectAsync();35await browser.CloseAsync();36await browser.DisconnectAsync();37await browser.DisposeAsync();38await browser.CloseAsync();39var page = await browser.NewPageAsync();

ExitAsync

Using AI Code Generation

1var page = await browser.NewPageAsync();2await page.CloseAsync();3await browser.CloseAsync();4await browser.ExitAsync();5var page = await browser.NewPageAsync();6await page.CloseAsync();7await browser.CloseAsync();8await browser.KillAsync();9var page = await browser.NewPageAsync();10await page.CloseAsync();11await browser.CloseAsync();12await browser.KillAsync();13var page = await browser.NewPageAsync();14await page.CloseAsync();15await browser.CloseAsync();16await browser.KillAsync();17var page = await browser.NewPageAsync();18await page.CloseAsync();19await browser.CloseAsync();20await browser.KillAsync();21var page = await browser.NewPageAsync();22await page.CloseAsync();23await browser.CloseAsync();24await browser.KillAsync();25var page = await browser.NewPageAsync();26await page.CloseAsync();27await browser.CloseAsync();28await browser.KillAsync();29var page = await browser.NewPageAsync();30await page.CloseAsync();31await browser.CloseAsync();32await browser.KillAsync();

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