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Viewing changes to src/addins/AspNetAddIn/MonoDevelop.AspNet.Gui/BrowserLauncher.cs

  • Committer: Bazaar Package Importer
  • Author(s): Jo Shields
  • Date: 2009-02-18 08:40:51 UTC
  • mfrom: (1.2.1 upstream)
  • Revision ID: james.westby@ubuntu.com-20090218084051-gh8m6ukvokbwj7cf
Tags: 1.9.2+dfsg-1ubuntu1
https://launchpad.net/bugs/330519
* Merge from Debian Experimental (LP: #330519), remaining Ubuntu changes:
  + debian/control:
    - Update for Gnome# 2.24
    - Add libmono-cairo1.0-cil to build-deps to fool pkg-config check

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src/addins/AspNetAddIn/MonoDevelop.AspNet.Gui/BrowserLauncher.cs
 
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// 
 
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// BrowserLauncher.cs
 
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// 
 
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// Author:
 
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//   Michael Hutchinson <mhutchinson@novell.com>
 
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// 
 
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// Copyright (C) 2008 Novell, Inc (http://www.novell.com)
 
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// 
 
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// Permission is hereby granted, free of charge, to any person obtaining
 
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// a copy of this software and associated documentation files (the
 
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// "Software"), to deal in the Software without restriction, including
 
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// without limitation the rights to use, copy, modify, merge, publish,
 
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// distribute, sublicense, and/or sell copies of the Software, and to
 
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// permit persons to whom the Software is furnished to do so, subject to
 
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// the following conditions:
 
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// 
 
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// The above copyright notice and this permission notice shall be
 
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// included in all copies or substantial portions of the Software.
 
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// 
 
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
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//
 
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using System;
 
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using System.Threading;
 
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using MonoDevelop.Core;
 
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namespace MonoDevelop.AspNet.Gui
 
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{
 
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        public static class BrowserLauncher
 
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        {
 
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                public static BrowserLauncherOperation LaunchWhenReady (string url, BrowserLaunchHandler browserHandler)
 
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                {
 
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                        return new BrowserLauncherOperation (url, browserHandler);
 
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                }
 
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                public static void LaunchDefaultBrowser (string url)
 
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                {
 
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                        MonoDevelop.Core.Gui.Services.PlatformService.ShowUrl (url);
 
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                }
 
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                public static BrowserLauncherOperation LaunchWhenReady (string url)
 
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                {
 
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                        return new BrowserLauncherOperation (url, LaunchDefaultBrowser);
 
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                }
 
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        }
 
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        public delegate void BrowserLaunchHandler (string url);
 
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        public class BrowserLauncherOperation : IAsyncOperation 
 
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        {
 
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                bool completed;
 
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                bool successful;
 
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                readonly string url;
 
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                readonly BrowserLaunchHandler browserHandler;
 
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                Thread launcherThread;
 
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                Exception error;
 
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                public BrowserLauncherOperation (string url, BrowserLaunchHandler browserHandler)
 
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                {
 
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                        if (browserHandler == null)
 
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                                throw new ArgumentNullException ("browserHandler");
 
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                        if (url == null)
 
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                                throw new ArgumentNullException ("url");
 
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                        this.url = url;
 
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                        this.browserHandler = browserHandler;
 
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                        if (url.StartsWith ("http://")) {
 
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                                launcherThread = new Thread (new ThreadStart (LaunchWebBrowser));
 
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                                launcherThread.Start ();
 
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                        } else {
 
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                                browserHandler (url);
 
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                                successful = true;
 
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                                IsCompleted = true;
 
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                        }
 
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                }
 
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                //confirm we can connect to server before opening browser; wait up to ten seconds
 
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                void LaunchWebBrowser ()
 
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                {
 
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                        try {                           
 
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                                //wait a bit for server to start
 
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                                Thread.Sleep (2000);
 
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                                //try to contact web server several times, because server may take a while to start
 
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                                int noOfRequests = 5;
 
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                                int timeout = 8000; //ms
 
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                                int wait = 1000; //ms
 
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                                for (int i = 0; i < noOfRequests; i++) {
 
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                                        System.Net.WebRequest req = null;
 
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                                        System.Net.WebResponse resp = null;
 
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                                        try {
 
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                                                req = System.Net.HttpWebRequest.Create (url);
 
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                                                req.Timeout = timeout;
 
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                                                resp = req.GetResponse ();
 
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                                        } catch (System.Net.WebException exp) {
 
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                                                // server has returned 404, 500 etc, which user will still want to see
 
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                                                if (exp.Status == System.Net.WebExceptionStatus.ProtocolError) {
 
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                                                        resp = exp.Response;
 
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                                                //final request has failed
 
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                                                } else if (i >= (noOfRequests - 1)) {
 
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                                                        string message = GettextCatalog.GetString ("Could not connect to webserver {0}", url);
 
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                                                        throw new UserException (message, exp.ToString ());
 
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                                                //we still have requests to go, so cancel the current one and sleep for a bit
 
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                                                } else {
 
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                                                        req.Abort ();
 
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                                                        Thread.Sleep (wait);
 
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                                                        continue;
 
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                                                }
 
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                                        }
 
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                                        if (resp != null) {
 
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                                                //TODO: a choice of browsers
 
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                                                browserHandler (url);
 
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                                                successful = true;
 
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                                                break;
 
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                                        }
 
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                                }
 
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                        } catch (ThreadAbortException) {
 
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                        } catch (Exception ex) {
 
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                                //don't want any exceptions leaking out the top of the thread, as they'd crash the runtime
 
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                                LoggingService.LogError ("Unhandled error in browser launcher thread", ex);
 
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                                error = ex;
 
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                        }
 
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                        IsCompleted = true;
 
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                }
 
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                public Exception Error {
 
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                        get { return error; }
 
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                }
 
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                public void Cancel ()
 
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                {
 
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                        //FIXME: should we try something more graceful than a thread abort? Tricky with the 2s waits...
 
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                        if (launcherThread != null && launcherThread.IsAlive && launcherThread.ThreadState != ThreadState.AbortRequested)
 
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                                launcherThread.Abort ();
 
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                }
 
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                public void WaitForCompleted ()
 
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                {
 
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                        if (launcherThread != null && launcherThread.IsAlive)
 
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                                launcherThread.Join ();
 
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                }
 
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                public event OperationHandler Completed {
 
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                        add {
 
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                                bool raiseNow = false;
 
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                                lock (this) {
 
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                                        if (IsCompleted)
 
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                                                raiseNow = true;
 
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                                        else
 
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                                                completedEvent += value;
 
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                                }
 
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                                if (raiseNow)
 
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                                        value (this);
 
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                        }
 
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                        remove {
 
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                                lock (this) {
 
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                                        completedEvent -= value;
 
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                                }
 
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                        }
 
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                }
 
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                public bool Success {
 
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                        get { return successful; }
 
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                }
 
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                public bool SuccessWithWarnings {
 
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                        get { return false; }
 
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                }
 
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                public bool IsCompleted {
 
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                        get { return completed; }
 
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                        private set {
 
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                                if (!value)
 
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                                        throw new InvalidOperationException ();
 
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                                completed = true;
 
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                                if (completedEvent != null)
 
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                                        completedEvent (this);
 
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                        }
 
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                }
 
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                event OperationHandler completedEvent;
 
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        }
 
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}