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How to use WaitForExitAsync method of PuppeteerSharp.States.InitialState class

Best Puppeteer-sharp code snippet using PuppeteerSharp.States.InitialState.WaitForExitAsync

ChromiumProcess.cs

Source:ChromiumProcess.cs

...147        /// </summary>148        /// <param name="timeout">The maximum wait period.</param>149        /// <returns><c>true</c> if Chromium process has exited within the given <paramref name="timeout"/>,150        /// or <c>false</c> otherwise.</returns>151        public async Task<bool> WaitForExitAsync(TimeSpan? timeout)152        {153            if (timeout.HasValue)154            {155                var completedTask = await Task.WhenAny(_exitCompletionSource.Task, Task.Delay(timeout.Value)).ConfigureAwait(false);156                return completedTask == _exitCompletionSource.Task;157            }158            await _exitCompletionSource.Task.ConfigureAwait(false);159            return true;160        }161        /// <inheritdoc />162        public override string ToString() => $"Chromium process; EndPoint={EndPoint}; State={_currentState}";163        #endregion164        #region Private methods165        private static (List<string> chromiumArgs, TempDirectory tempUserDataDir) PrepareChromiumArgs(LaunchOptions options)166        {167            var chromiumArgs = new List<string>();168            if (!options.IgnoreDefaultArgs)169            {170                chromiumArgs.AddRange(GetDefaultArgs(options));171            }172            else if (options.IgnoredDefaultArgs?.Length > 0)173            {174                chromiumArgs.AddRange(GetDefaultArgs(options).Except(options.IgnoredDefaultArgs));175            }176            else177            {178                chromiumArgs.AddRange(options.Args);179            }180            TempDirectory tempUserDataDir = null;181            if (!chromiumArgs.Any(argument => argument.StartsWith("--remote-debugging-", StringComparison.Ordinal)))182            {183                chromiumArgs.Add("--remote-debugging-port=0");184            }185            var userDataDirOption = chromiumArgs.FirstOrDefault(i => i.StartsWith(UserDataDirArgument, StringComparison.Ordinal));186            if (string.IsNullOrEmpty(userDataDirOption))187            {188                tempUserDataDir = new TempDirectory();189                chromiumArgs.Add($"{UserDataDirArgument}={tempUserDataDir.Path.Quote()}");190            }191            return (chromiumArgs, tempUserDataDir);192        }193        internal static string[] GetDefaultArgs(LaunchOptions options)194        {195            var chromeArguments = new List<string>(DefaultArgs);196            if (!string.IsNullOrEmpty(options.UserDataDir))197            {198                chromeArguments.Add($"{UserDataDirArgument}={options.UserDataDir.Quote()}");199            }200            if (options.Devtools)201            {202                chromeArguments.Add("--auto-open-devtools-for-tabs");203            }204            if (options.Headless)205            {206                chromeArguments.AddRange(new[]{207                    "--headless",208                    "--hide-scrollbars",209                    "--mute-audio"210                });211                if (BrowserFetcher.GetCurrentPlatform() == Platform.Win32)212                {213                    chromeArguments.Add("--disable-gpu");214                }215            }216            if (options.Args.All(arg => arg.StartsWith("-", StringComparison.Ordinal)))217            {218                chromeArguments.Add("about:blank");219            }220            chromeArguments.AddRange(options.Args);221            return chromeArguments.ToArray();222        }223        private static void SetEnvVariables(IDictionary<string, string> environment, IDictionary<string, string> customEnv, IDictionary realEnv)224        {225            foreach (DictionaryEntry item in realEnv)226            {227                environment[item.Key.ToString()] = item.Value.ToString();228            }229            if (customEnv != null)230            {231                foreach (var item in customEnv)232                {233                    environment[item.Key] = item.Value;234                }235            }236        }237        #endregion238        #region State machine239        /// <summary>240        /// Represents state machine for Chromium process instances. The happy path runs along the241        /// following state transitions: <see cref="Initial"/>242        /// -> <see cref="Starting"/>243        /// -> <see cref="Started"/>244        /// -> <see cref="Exiting"/>245        /// -> <see cref="Exited"/>.246        /// -> <see cref="Disposed"/>.247        /// </summary>248        /// <remarks>249        /// <para>250        /// This state machine implements the following state transitions:251        /// <code>252        /// State     Event              Target State Action253        /// ======== =================== ============ ==========================================================254        /// Initial  --StartAsync------> Starting     Start process and wait for endpoint255        /// Initial  --ExitAsync-------> Exited       Cleanup temp user data256        /// Initial  --KillAsync-------> Exited       Cleanup temp user data257        /// Initial  --Dispose---------> Disposed     Cleanup temp user data258        /// Starting --StartAsync------> Starting     -259        /// Starting --ExitAsync-------> Exiting      Wait for process exit260        /// Starting --KillAsync-------> Killing      Kill process261        /// Starting --Dispose---------> Disposed     Kill process; Cleanup temp user data;  throw ObjectDisposedException on outstanding async operations;262        /// Starting --endpoint ready--> Started      Complete StartAsync successfully; Log process start263        /// Starting --process exit----> Exited       Complete StartAsync with exception; Cleanup temp user data264        /// Started  --StartAsync------> Started      -265        /// Started  --EnsureExitAsync-> Exiting      Start exit timer; Log process exit266        /// Started  --KillAsync-------> Killing      Kill process; Log process exit267        /// Started  --Dispose---------> Disposed     Kill process; Log process exit; Cleanup temp user data; throw ObjectDisposedException on outstanding async operations;268        /// Started  --process exit----> Exited       Log process exit; Cleanup temp user data269        /// Exiting  --StartAsync------> Exiting      - (StartAsync throws InvalidOperationException)270        /// Exiting  --ExitAsync-------> Exiting      -271        /// Exiting  --KillAsync-------> Killing      Kill process272        /// Exiting  --Dispose---------> Disposed     Kill process; Cleanup temp user data; throw ObjectDisposedException on outstanding async operations;273        /// Exiting  --exit timeout----> Killing      Kill process274        /// Exiting  --process exit----> Exited       Cleanup temp user data; complete outstanding async operations;275        /// Killing  --StartAsync------> Killing      - (StartAsync throws InvalidOperationException)276        /// Killing  --KillAsync-------> Killing      -277        /// Killing  --Dispose---------> Disposed     Cleanup temp user data; throw ObjectDisposedException on outstanding async operations;278        /// Killing  --process exit----> Exited       Cleanup temp user data; complete outstanding async operations;279        /// Exited   --StartAsync------> Killing      - (StartAsync throws InvalidOperationException)280        /// Exited   --KillAsync-------> Exited       -281        /// Exited   --Dispose---------> Disposed     -282        /// Disposed --StartAsync------> Disposed     -283        /// Disposed --KillAsync-------> Disposed     -284        /// Disposed --Dispose---------> Disposed     -285        /// </code>286        /// </para>287        /// </remarks>288        private abstract class State289        {290            #region Predefined states291            public static readonly State Initial = new InitialState();292            private static readonly StartingState Starting = new StartingState();293            private static readonly StartedState Started = new StartedState();294            private static readonly ExitingState Exiting = new ExitingState();295            private static readonly KillingState Killing = new KillingState();296            private static readonly ExitedState Exited = new ExitedState();297            private static readonly DisposedState Disposed = new DisposedState();298            #endregion299            #region Properties300            public bool IsExiting => this == Killing || this == Exiting;301            public bool IsExited => this == Exited || this == Disposed;302            #endregion303            #region Methods304            /// <summary>305            /// Attempts thread-safe transitions from a given state to this state.306            /// </summary>307            /// <param name="p">The Chromium process</param>308            /// <param name="fromState">The state from which state transition takes place</param>309            /// <returns>Returns <c>true</c> if transition is successful, or <c>false</c> if transition310            /// cannot be made because current state does not equal <paramref name="fromState"/>.</returns>311            protected bool TryEnter(ChromiumProcess p, State fromState)312            {313                if (Interlocked.CompareExchange(ref p._currentState, this, fromState) == fromState)314                {315                    fromState.Leave(p);316                    return true;317                }318                return false;319            }320            /// <summary>321            /// Notifies that state machine is about to transition to another state.322            /// </summary>323            /// <param name="p">The Chromium process</param>324            protected virtual void Leave(ChromiumProcess p)325            { }326            /// <summary>327            /// Handles process start request.328            /// </summary>329            /// <param name="p">The Chromium process</param>330            /// <returns></returns>331            public virtual Task StartAsync(ChromiumProcess p) => Task.FromException(InvalidOperation("start"));332            /// <summary>333            /// Handles process exit request.334            /// </summary>335            /// <param name="p">The Chromium process</param>336            /// <param name="timeout">The maximum waiting time for a graceful process exit.</param>337            /// <returns></returns>338            public virtual Task ExitAsync(ChromiumProcess p, TimeSpan timeout) => Task.FromException(InvalidOperation("exit"));339            /// <summary>340            /// Handles process kill request.341            /// </summary>342            /// <param name="p">The Chromium process</param>343            /// <returns></returns>344            public virtual Task KillAsync(ChromiumProcess p) => Task.FromException(InvalidOperation("kill"));345            /// <summary>346            /// Handles wait for process exit request.347            /// </summary>348            /// <param name="p">The Chromium process</param>349            /// <returns></returns>350            public virtual Task WaitForExitAsync(ChromiumProcess p) => p._exitCompletionSource.Task;351            /// <summary>352            /// Handles disposal of process and temporary user directory353            /// </summary>354            /// <param name="p"></param>355            public virtual void Dispose(ChromiumProcess p) => Disposed.EnterFrom(p, this);356            public override string ToString()357            {358                var name = GetType().Name;359                return name.Substring(0, name.Length - "State".Length);360            }361            private Exception InvalidOperation(string operationName)362                => new InvalidOperationException($"Cannot {operationName} in state {this}");363            /// <summary>364            /// Kills process if it is still alive.365            /// </summary>366            /// <param name="p"></param>367            private static void Kill(ChromiumProcess p)368            {369                try370                {371                    if (!p.Process.HasExited)372                    {373                        p.Process.Kill();374                    }375                }376                catch (InvalidOperationException)377                {378                    // Ignore379                }380            }381            #endregion382            #region Concrete state classes383            private class InitialState : State384            {385                public override Task StartAsync(ChromiumProcess p) => Starting.EnterFromAsync(p, this);386                public override Task ExitAsync(ChromiumProcess p, TimeSpan timeout)387                {388                    Exited.EnterFrom(p, this);389                    return Task.CompletedTask;390                }391                public override Task KillAsync(ChromiumProcess p)392                {393                    Exited.EnterFrom(p, this);394                    return Task.CompletedTask;395                }396                public override Task WaitForExitAsync(ChromiumProcess p) => Task.FromException(InvalidOperation("wait for exit"));397            }398            private class StartingState : State399            {400                public Task EnterFromAsync(ChromiumProcess p, State fromState)401                {402                    if (!TryEnter(p, fromState))403                    {404                        // Delegate StartAsync to current state, because it has already changed since405                        // transition to this state was initiated.406                        return p._currentState.StartAsync(p);407                    }408                    return StartCoreAsync(p);409                }410                public override Task StartAsync(ChromiumProcess p) => p._startCompletionSource.Task;411                public override Task ExitAsync(ChromiumProcess p, TimeSpan timeout) => Exiting.EnterFromAsync(p, this, timeout);412                public override Task KillAsync(ChromiumProcess p) => Killing.EnterFromAsync(p, this);413                public override void Dispose(ChromiumProcess p)414                {415                    p._startCompletionSource.TrySetException(new ObjectDisposedException(p.ToString()));416                    base.Dispose(p);417                }418                private async Task StartCoreAsync(ChromiumProcess p)419                {420                    var output = new StringBuilder();421                    void OnProcessDataReceivedWhileStarting(object sender, DataReceivedEventArgs e)422                    {423                        if (e.Data != null)424                        {425                            output.AppendLine(e.Data);426                            var match = Regex.Match(e.Data, "^DevTools listening on (ws:\\/\\/.*)");427                            if (match.Success)428                            {429                                p._startCompletionSource.SetResult(match.Groups[1].Value);430                            }431                        }432                    }433                    void OnProcessExitedWhileStarting(object sender, EventArgs e)434                    {435                        p._startCompletionSource.SetException(new ChromiumProcessException($"Failed to launch Chromium! {output}"));436                    }437                    void OnProcessExited(object sender, EventArgs e)438                    {439                        Exited.EnterFrom(p, p._currentState);440                    }441                    p.Process.ErrorDataReceived += OnProcessDataReceivedWhileStarting;442                    p.Process.Exited += OnProcessExitedWhileStarting;443                    p.Process.Exited += OnProcessExited;444                    CancellationTokenSource cts = null;445                    try446                    {447                        p.Process.Start();448                        await Started.EnterFromAsync(p, this).ConfigureAwait(false);449                        p.Process.BeginErrorReadLine();450                        var timeout = p._options.Timeout;451                        if (timeout > 0)452                        {453                            cts = new CancellationTokenSource(timeout);454                            cts.Token.Register(() => p._startCompletionSource.TrySetException(455                                new ChromiumProcessException($"Timed out after {timeout} ms while trying to connect to Chromium!")));456                        }457                        try458                        {459                            await p._startCompletionSource.Task.ConfigureAwait(false);460                            await Started.EnterFromAsync(p, this).ConfigureAwait(false);461                        }462                        catch463                        {464                            await Killing.EnterFromAsync(p, this).ConfigureAwait(false);465                            throw;466                        }467                    }468                    finally469                    {470                        cts?.Dispose();471                        p.Process.Exited -= OnProcessExitedWhileStarting;472                        p.Process.ErrorDataReceived -= OnProcessDataReceivedWhileStarting;473                    }474                }475            }476            private class StartedState : State477            {478                public Task EnterFromAsync(ChromiumProcess p, State fromState)479                {480                    if (TryEnter(p, fromState))481                    {482                        // Process has not exited or been killed since transition to this state was initiated483                        LogProcessCount(p, Interlocked.Increment(ref _processCount));484                    }485                    return Task.CompletedTask;486                }487                protected override void Leave(ChromiumProcess p)488                    => LogProcessCount(p, Interlocked.Decrement(ref _processCount));489                public override Task StartAsync(ChromiumProcess p) => Task.CompletedTask;490                public override Task ExitAsync(ChromiumProcess p, TimeSpan timeout) => Exiting.EnterFromAsync(p, this, timeout);491                public override Task KillAsync(ChromiumProcess p) => Killing.EnterFromAsync(p, this);492                private static void LogProcessCount(ChromiumProcess p, int processCount)493                {494                    try495                    {496                        p._logger?.LogInformation("Process Count: {ProcessCount}", processCount);497                    }498                    catch499                    {500                        // Prevent logging exception from causing havoc501                    }502                }503            }504            private class ExitingState : State505            {506                public Task EnterFromAsync(ChromiumProcess p, State fromState, TimeSpan timeout)507                {508                    return !TryEnter(p, fromState) ? p._currentState.ExitAsync(p, timeout) : ExitAsync(p, timeout);509                }510                public override async Task ExitAsync(ChromiumProcess p, TimeSpan timeout)511                {512                    var timeoutTask = Task.Delay(timeout);513                    var waitForExitTask = WaitForExitAsync(p);514                    var completedTask = await Task.WhenAny(waitForExitTask, timeoutTask).ConfigureAwait(false);515                    if (completedTask == timeoutTask)516                    {517                        await Killing.EnterFromAsync(p, this).ConfigureAwait(false);518                        await waitForExitTask.ConfigureAwait(false);519                    }520                }521                public override Task KillAsync(ChromiumProcess p) => Killing.EnterFromAsync(p, this);522            }523            private class KillingState : State524            {525                public Task EnterFromAsync(ChromiumProcess p, State fromState)526                {527                    if (!TryEnter(p, fromState))528                    {529                        // Delegate KillAsync to current state, because it has already changed since530                        // transition to this state was initiated.531                        return p._currentState.KillAsync(p);532                    }533                    try534                    {535                        if (!p.Process.HasExited)536                        {537                            p.Process.Kill();538                        }539                    }540                    catch (InvalidOperationException)541                    {542                        // Ignore543                    }544                    return WaitForExitAsync(p);545                }546                public override Task ExitAsync(ChromiumProcess p, TimeSpan timeout) => WaitForExitAsync(p);547                public override Task KillAsync(ChromiumProcess p) => WaitForExitAsync(p);548            }549            private class ExitedState : State550            {551                public void EnterFrom(ChromiumProcess p, State fromState)552                {553                    while (!TryEnter(p, fromState))554                    {555                        // Current state has changed since transition to this state was requested.556                        // Therefore retry transition to this state from the current state. This ensures557                        // that Leave() operation of current state is properly called.558                        fromState = p._currentState;559                        if (fromState == this)560                        {561                            return;562                        }563                    }564                    p._exitCompletionSource.TrySetResult(true);565                    p._tempUserDataDir?.Dispose();566                }567                public override Task ExitAsync(ChromiumProcess p, TimeSpan timeout) => Task.CompletedTask;568                public override Task KillAsync(ChromiumProcess p) => Task.CompletedTask;569                public override Task WaitForExitAsync(ChromiumProcess p) => Task.CompletedTask;570            }571            private class DisposedState : State572            {573                public void EnterFrom(ChromiumProcess p, State fromState)574                {575                    if (!TryEnter(p, fromState))576                    {577                        // Delegate Dispose to current state, because it has already changed since578                        // transition to this state was initiated.579                        p._currentState.Dispose(p);580                    }581                    else if (fromState != Exited)582                    {583                        Kill(p);...

LauncherBase.cs

Source:LauncherBase.cs

...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);...

InitialState.cs

Source:InitialState.cs

...17        {18            StateManager.Exited.EnterFromAsync(p, this);19            return Task.CompletedTask;20        }21        public override Task WaitForExitAsync(LauncherBase p) => Task.FromException(InvalidOperation("wait for exit"));22        private Exception InvalidOperation(string v)23        {24            throw new NotImplementedException();25        }26    }27}...

WaitForExitAsync

Using AI Code Generation

1var browser = await Puppeteer.LaunchAsync(new LaunchOptions2{3});4var page = await browser.NewPageAsync();5await page.WaitForSelectorAsync("input[name=\"q\"]");6await page.TypeAsync("input[name=\"q\"]", "Hello World");7await page.WaitForSelectorAsync("input[name=\"btnK\"]");8await page.ClickAsync("input[name=\"btnK\"]");9await page.WaitForNavigationAsync();10await page.WaitForSelectorAsync("div#search");11var searchResults = await page.QuerySelectorAllAsync("div#search div.g");12Console.WriteLine($"Found {searchResults.Length} results");13await page.CloseAsync();14await browser.CloseAsync();

WaitForExitAsync

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5    {6        static async Task Main(string[] args)7        {8            var options = new LaunchOptions { Headless = false };9            using (var browser = await Puppeteer.LaunchAsync(options))10            {11                var page = await browser.NewPageAsync();12                await page.WaitForSelectorAsync("input[name='q']");13                await page.TypeAsync("input[name='q']", "PuppeteerSharp");14                await page.Keyboard.PressAsync("Enter");15                await page.WaitForNavigationAsync();16                var result = await page.WaitForExitAsync();17                Console.WriteLine(result);18            }19        }20    }21}

WaitForExitAsync

Using AI Code Generation

1var  browser = await Puppeteer.LaunchAsync(new LaunchOptions2{3});4var page = await browser.NewPageAsync();5await page.WaitForSelectorAsync("input[name=q]");6await page.TypeAsync("input[name=q]", "Hello World!");7await page.Keyboard.PressAsync("Enter");8await page.WaitForNavigationAsync();9await page.ScreenshotAsync("example.png");10await browser.CloseAsync();11var browser = await Puppeteer.LaunchAsync(new LaunchOptions12{13});14var page = await browser.NewPageAsync();15await page.WaitForSelectorAsync("input[name=q]");16await page.TypeAsync("input[name=q]", "Hello World!");17await page.Keyboard.PressAsync("Enter");18await page.WaitForNavigationAsync();19await page.ScreenshotAsync("example.png");20await browser.CloseAsync();21var browser = await Puppeteer.LaunchAsync(new LaunchOptions22{23});24var page = await browser.NewPageAsync();25await page.WaitForSelectorAsync("input[name=q]");26await page.TypeAsync("input[name=q]", "Hello World!");27await page.Keyboard.PressAsync("Enter");28await page.WaitForNavigationAsync();29await page.ScreenshotAsync("example.png");30await browser.CloseAsync();31var browser = await Puppeteer.LaunchAsync(new LaunchOptions32{33});34var page = await browser.NewPageAsync();35await page.WaitForSelectorAsync("input[name=q]");36await page.TypeAsync("input

WaitForExitAsync

Using AI Code Generation

1var browser = await Puppeteer.LaunchAsync(new LaunchOptions2{3    Args = new string[] { "--window-size=1920,1080" }4});5var page = await browser.NewPageAsync();6await page.WaitForSelectorAsync("input[title='Search']");7var browser = await Puppeteer.LaunchAsync(new LaunchOptions8{9    Args = new string[] { "--window-size=1920,1080" }10});11var page = await browser.NewPageAsync();12await page.WaitForSelectorAsync("input[title='Search']");

WaitForExitAsync

Using AI Code Generation

1using System.Threading.Tasks;2using PuppeteerSharp;3{4    {5        internal InitialState(Browser browser) : base(browser)6        {7        }8        public override Task WaitForTargetAsync(TargetChangedDelegate targetChanged, TargetFilterOptions options = null)9        {10            if (targetChanged == null)11            {12                throw new System.ArgumentNullException(nameof(targetChanged));13            }14            if (options == null)15            {16                options = new TargetFilterOptions();17            }18            var initialTargetCount = Browser.Targets.Count;19            var waitForTargetTask = new TaskCompletionSource<bool>();20            void TargetChangedHandler(object sender, TargetChangedArgs e)21            {22                if (e.Target.Type != options.Type)23                {24                    return;25                }26                if (options.Url != null && !options.Url.IsMatch(e.Target.Url))27                {28                    return;29                }30                waitForTargetTask.TrySetResult(true);31                Browser.TargetChanged -= TargetChangedHandler;32            }33            Browser.TargetChanged += TargetChangedHandler;34            if (initialTargetCount == Browser.Targets.Count)35            {36                waitForTargetTask.TrySetResult(true);37                Browser.TargetChanged -= TargetChangedHandler;38            }39            return waitForTargetTask.Task;40        }41        public override Task WaitForExitAsync()42        {43            return new TaskCompletionSource<bool>().Task;44        }45    }46}47using System.Threading.Tasks;48using PuppeteerSharp;49{50    {51        internal BrowserClosedState(Browser browser) : base(browser)52        {53        }54        public override Task WaitForExitAsync()55        {56            return new TaskCompletionSource<bool>().Task;57        }58    }59}60using System.Threading.Tasks;61using PuppeteerSharp;62{63    {64        internal BrowserConnectedState(Browser browser) : base(browser)65        {66        }67        public override Task WaitForExitAsync()68        {

WaitForExitAsync

Using AI Code Generation

1var browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = false });2var page = await browser.NewPageAsync();3await page.WaitForNavigationAsync();4await page.WaitForSelectorAsync("input[title='Search']");5await page.TypeAsync("input[title='Search']", "PuppeteerSharp");6await page.Keyboard.PressAsync("Enter");7await page.WaitForNavigationAsync();8await page.WaitForSelectorAsync("h3.LC20lb");9await page.ScreenshotAsync("1.png");10await page.CloseAsync();11await browser.CloseAsync();12var browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = false });13var page = await browser.NewPageAsync();14await page.WaitForNavigationAsync();15await page.WaitForSelectorAsync("input[title='Search']");16await page.TypeAsync("input[title='Search']", "PuppeteerSharp");17await page.Keyboard.PressAsync("Enter");18await page.WaitForNavigationAsync();19await page.WaitForSelectorAsync("h3.LC20lb");20await page.ScreenshotAsync("2.png");21await page.CloseAsync();22await browser.CloseAsync();23var browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = false });24var page = await browser.NewPageAsync();25await page.WaitForNavigationAsync();26await page.WaitForSelectorAsync("input[title='Search']");27await page.TypeAsync("input[title='Search']", "PuppeteerSharp");28await page.Keyboard.PressAsync("Enter");29await page.WaitForNavigationAsync();30await page.WaitForSelectorAsync("h3.LC20lb");31await page.ScreenshotAsync("3.png");32await page.CloseAsync();33await browser.CloseAsync();34var browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = false });35var page = await browser.NewPageAsync();36await page.WaitForNavigationAsync();37await page.WaitForSelectorAsync("input[

WaitForExitAsync

Using AI Code Generation

1var state = new PuppeteerSharp.States.InitialState();2var result = await state.WaitForExitAsync();3Console.WriteLine(result);4var state = new PuppeteerSharp.States.InitialState();5var result = await state.WaitForExitAsync();6Console.WriteLine(result);7var state = new PuppeteerSharp.States.InitialState();8var result = await state.WaitForExitAsync();9Console.WriteLine(result);10var state = new PuppeteerSharp.States.InitialState();11var result = await state.WaitForExitAsync();12Console.WriteLine(result);13var state = new PuppeteerSharp.States.InitialState();14var result = await state.WaitForExitAsync();15Console.WriteLine(result);16var state = new PuppeteerSharp.States.InitialState();17var result = await state.WaitForExitAsync();18Console.WriteLine(result);19var state = new PuppeteerSharp.States.InitialState();20var result = await state.WaitForExitAsync();21Console.WriteLine(result);22var state = new PuppeteerSharp.States.InitialState();23var result = await state.WaitForExitAsync();24Console.WriteLine(result);25var state = new PuppeteerSharp.States.InitialState();26var result = await state.WaitForExitAsync();27Console.WriteLine(result);28var state = new PuppeteerSharp.States.InitialState();29var result = await state.WaitForExitAsync();30Console.WriteLine(result);

WaitForExitAsync

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5    {6        public static Task WaitForExitAsync(this Page page, string selector, int timeout = 30000)7        {8            return page.WaitForSelectorAsync(selector, new WaitForSelectorOptions { Hidden = true, Timeout = timeout });9        }10    }11}12using System;13using System.Threading.Tasks;14using PuppeteerSharp;15{16    {17        public static Task WaitForExitAsync(this Page page, string selector, int timeout = 30000)18        {19            return page.WaitForSelectorAsync(selector, new WaitForSelectorOptions { Hidden = true, Timeout = timeout });20        }21    }22}23using System;24using System.Threading.Tasks;25using PuppeteerSharp;26{27    {28        public static Task WaitForExitAsync(this Page page, string selector, int timeout = 30000)29        {30            return page.WaitForSelectorAsync(selector, new WaitForSelectorOptions { Hidden = true, Timeout = timeout });31        }32    }33}34using System;35using System.Threading.Tasks;36using PuppeteerSharp;37{38    {39        public static Task WaitForExitAsync(this Page page, string selector, int timeout = 30000)40        {41            return page.WaitForSelectorAsync(selector, new WaitForSelectorOptions { Hidden = true, Timeout = timeout });42        }43    }44}45using System;46using System.Threading.Tasks;47using PuppeteerSharp;48{49    {50        public static Task WaitForExitAsync(this Page page, string selector, int timeout = 30000)51        {52            return page.WaitForSelectorAsync(selector, new WaitForSelectorOptions { Hidden = true, Timeout = timeout });53        }54    }55}

WaitForExitAsync

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            using (var browser = await Puppeteer.LaunchAsync(options))15            using (var page = await browser.NewPageAsync())16            {17                await page.WaitForSelectorAsync("input[name=q]");18                await page.ScreenshotAsync("screenshot.png");19            }20        }21    }22}23using System;24using System.Threading.Tasks;25using PuppeteerSharp;26{27    {28        static void Main(string[] args)29        {30            MainAsync().GetAwaiter().GetResult();31        }32        static async Task MainAsync()33        {34            {35            };36            using (var browser = await Puppeteer.LaunchAsync(options))37            using (var page = await browser.NewPageAsync())38            {39                await page.WaitForSelectorAsync("input[name=q]");40                await page.ScreenshotAsync("screenshot.png");41            }42        }43    }44}45using System;46using System.Threading.Tasks;47using PuppeteerSharp;48{

Automation Testing Tutorials

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