public virtual void Run() { running = true; HttpClient httpClient; if (client == null) { // This is a race condition that can be reproduced by calling cbpuller.start() and cbpuller.stop() // directly afterwards. What happens is that by the time the Changetracker thread fires up, // the cbpuller has already set this.client to null. See issue #109 Log.W(Database.Tag, "ChangeTracker run() loop aborting because client == null"); return; } if (mode == ChangeTracker.ChangeTrackerMode.Continuous) { // there is a failing unit test for this, and from looking at the code the Replication // object will never use Continuous mode anyway. Explicitly prevent its use until // it is demonstrated to actually work. throw new RuntimeException("ChangeTracker does not correctly support continuous mode" ); } httpClient = client.GetHttpClient(); ChangeTrackerBackoff backoff = new ChangeTrackerBackoff(); while (running) { Uri url = GetChangesFeedURL(); request = new HttpGet(url.ToString()); AddRequestHeaders(request); // if the URL contains user info AND if this a DefaultHttpClient // then preemptively set the auth credentials if (url.GetUserInfo() != null) { Log.V(Database.Tag, "url.getUserInfo(): " + url.GetUserInfo()); if (url.GetUserInfo().Contains(":") && !url.GetUserInfo().Trim().Equals(":")) { string[] userInfoSplit = url.GetUserInfo().Split(":"); Credentials creds = new UsernamePasswordCredentials(URIUtils.Decode(userInfoSplit [0]), URIUtils.Decode(userInfoSplit[1])); if (httpClient is DefaultHttpClient) { DefaultHttpClient dhc = (DefaultHttpClient)httpClient; MessageProcessingHandler preemptiveAuth = new _MessageProcessingHandler_212(creds ); dhc.AddRequestInterceptor(preemptiveAuth, 0); } } else { Log.W(Database.Tag, "ChangeTracker Unable to parse user info, not setting credentials" ); } } try { string maskedRemoteWithoutCredentials = GetChangesFeedURL().ToString(); maskedRemoteWithoutCredentials = maskedRemoteWithoutCredentials.ReplaceAll("://.*:.*@" , "://---:---@"); Log.V(Database.Tag, "Making request to " + maskedRemoteWithoutCredentials); HttpResponse response = httpClient.Execute(request); StatusLine status = response.GetStatusLine(); if (status.GetStatusCode() >= 300) { Log.E(Database.Tag, "Change tracker got error " + Sharpen.Extensions.ToString(status .GetStatusCode())); string msg = string.Format(status.ToString()); this.error = new CouchbaseLiteException(msg, new Status(status.GetStatusCode())); Stop(); } HttpEntity entity = response.GetEntity(); InputStream input = null; if (entity != null) { input = entity.GetContent(); if (mode == ChangeTracker.ChangeTrackerMode.LongPoll) { IDictionary<string, object> fullBody = Manager.GetObjectMapper().ReadValue<IDictionary >(input); bool responseOK = ReceivedPollResponse(fullBody); if (mode == ChangeTracker.ChangeTrackerMode.LongPoll && responseOK) { Log.V(Database.Tag, "Starting new longpoll"); continue; } else { Log.W(Database.Tag, "Change tracker calling stop"); Stop(); } } else { JsonFactory jsonFactory = Manager.GetObjectMapper().GetJsonFactory(); JsonParser jp = jsonFactory.CreateJsonParser(input); while (jp.NextToken() != JsonToken.StartArray) { } // ignore these tokens while (jp.NextToken() == JsonToken.StartObject) { IDictionary<string, object> change = (IDictionary)Manager.GetObjectMapper().ReadValue <IDictionary>(jp); if (!ReceivedChange(change)) { Log.W(Database.Tag, string.Format("Received unparseable change line from server: %s" , change)); } } Stop(); break; } backoff.ResetBackoff(); } } catch (Exception e) { if (!running && e is IOException) { } else { // in this case, just silently absorb the exception because it // frequently happens when we're shutting down and have to // close the socket underneath our read. Log.E(Database.Tag, "Exception in change tracker", e); } backoff.SleepAppropriateAmountOfTime(); } } Log.V(Database.Tag, "Change tracker run loop exiting"); }
public virtual void Run() { running = true; HttpClient httpClient; if (client == null) { // This is a race condition that can be reproduced by calling cbpuller.start() and cbpuller.stop() // directly afterwards. What happens is that by the time the Changetracker thread fires up, // the cbpuller has already set this.client to null. See issue #109 Log.W(Database.Tag, "ChangeTracker run() loop aborting because client == null"); return; } if (mode == ChangeTracker.ChangeTrackerMode.Continuous) { // there is a failing unit test for this, and from looking at the code the Replication // object will never use Continuous mode anyway. Explicitly prevent its use until // it is demonstrated to actually work. throw new RuntimeException("ChangeTracker does not correctly support continuous mode" ); } httpClient = client.GetHttpClient(); ChangeTrackerBackoff backoff = new ChangeTrackerBackoff(); while (running) { Uri url = GetChangesFeedURL(); request = new HttpGet(url.ToString()); AddRequestHeaders(request); // if the URL contains user info AND if this a DefaultHttpClient // then preemptively set the auth credentials if (url.GetUserInfo() != null) { Log.V(Database.Tag, "url.getUserInfo(): " + url.GetUserInfo()); if (url.GetUserInfo().Contains(":") && !url.GetUserInfo().Trim().Equals(":")) { string[] userInfoSplit = url.GetUserInfo().Split(":"); Credentials creds = new UsernamePasswordCredentials(URIUtils.Decode(userInfoSplit [0]), URIUtils.Decode(userInfoSplit[1])); if (httpClient is DefaultHttpClient) { DefaultHttpClient dhc = (DefaultHttpClient)httpClient; MessageProcessingHandler preemptiveAuth = new _MessageProcessingHandler_212(creds ); dhc.AddRequestInterceptor(preemptiveAuth, 0); } } else { Log.W(Database.Tag, "ChangeTracker Unable to parse user info, not setting credentials" ); } } try { string maskedRemoteWithoutCredentials = GetChangesFeedURL().ToString(); maskedRemoteWithoutCredentials = maskedRemoteWithoutCredentials.ReplaceAll("://.*:.*@" , "://---:---@"); Log.V(Database.Tag, "Making request to " + maskedRemoteWithoutCredentials); HttpResponse response = httpClient.Execute(request); StatusLine status = response.GetStatusLine(); if (status.GetStatusCode() >= 300) { Log.E(Database.Tag, "Change tracker got error " + Sharpen.Extensions.ToString(status .GetStatusCode())); string msg = string.Format(status.ToString()); this.error = new CouchbaseLiteException(msg, new Status(status.GetStatusCode())); Stop(); } HttpEntity entity = response.GetEntity(); InputStream input = null; if (entity != null) { input = entity.GetContent(); if (mode == ChangeTracker.ChangeTrackerMode.LongPoll) { IDictionary <string, object> fullBody = Manager.GetObjectMapper().ReadValue <IDictionary >(input); bool responseOK = ReceivedPollResponse(fullBody); if (mode == ChangeTracker.ChangeTrackerMode.LongPoll && responseOK) { Log.V(Database.Tag, "Starting new longpoll"); continue; } else { Log.W(Database.Tag, "Change tracker calling stop"); Stop(); } } else { JsonFactory jsonFactory = Manager.GetObjectMapper().GetJsonFactory(); JsonParser jp = jsonFactory.CreateJsonParser(input); while (jp.NextToken() != JsonToken.StartArray) { } // ignore these tokens while (jp.NextToken() == JsonToken.StartObject) { IDictionary <string, object> change = (IDictionary)Manager.GetObjectMapper().ReadValue <IDictionary>(jp); if (!ReceivedChange(change)) { Log.W(Database.Tag, string.Format("Received unparseable change line from server: %s" , change)); } } Stop(); break; } backoff.ResetBackoff(); } } catch (Exception e) { if (!running && e is IOException) { } else { // in this case, just silently absorb the exception because it // frequently happens when we're shutting down and have to // close the socket underneath our read. Log.E(Database.Tag, "Exception in change tracker", e); } backoff.SleepAppropriateAmountOfTime(); } } Log.V(Database.Tag, "Change tracker run loop exiting"); }