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, this + ": 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();
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, this + ": 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_221(creds
);
dhc.AddRequestInterceptor(preemptiveAuth, 0);
}
}
else
{
Log.W(Database.Tag, this + ": ChangeTracker Unable to parse user info, not setting credentials"
);
}
}
try
{
string maskedRemoteWithoutCredentials = GetChangesFeedURL().ToString();
maskedRemoteWithoutCredentials = maskedRemoteWithoutCredentials.ReplaceAll("://.*:.*@"
, "://---:---@");
Log.V(Database.Tag, this + ": Making request to " + maskedRemoteWithoutCredentials
);
HttpResponse response = httpClient.Execute(request);
StatusLine status = response.GetStatusLine();
if (status.GetStatusCode() >= 300)
{
Log.E(Database.Tag, this + ": 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)
{
try
{
input = entity.GetContent();
if (mode == ChangeTracker.ChangeTrackerMode.LongPoll)
{
// continuous replications
IDictionary<string, object> fullBody = Manager.GetObjectMapper().ReadValue<IDictionary
>(input);
bool responseOK = ReceivedPollResponse(fullBody);
if (mode == ChangeTracker.ChangeTrackerMode.LongPoll && responseOK)
{
Log.V(Database.Tag, this + ": Starting new longpoll");
backoff.ResetBackoff();
continue;
}
else
{
Log.W(Database.Tag, this + ": Change tracker calling stop (LongPoll)");
Stop();
}
}
else
{
// one-shot replications
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));
}
}
Log.W(Database.Tag, this + ": Change tracker calling stop (OneShot)");
Stop();
break;
}
backoff.ResetBackoff();
}
finally
{
try
{
entity.ConsumeContent();
}
catch (IOException)
{
}
}
}
}
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, this + ": Exception in change tracker", e);
}
backoff.SleepAppropriateAmountOfTime();
}
}
Log.V(Database.Tag, this + ": 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 HttpRequestMessage(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(":");
throw new NotImplementedException();
// 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((HttpWebRequest request, HttpContext context)=>
// {
// AuthState authState = (AuthState)context.GetAttribute(ClientContext.TargetAuthState
// );
// CredentialsProvider credsProvider = (CredentialsProvider)context.GetAttribute(ClientContext
// .CredsProvider);
// HttpHost targetHost = (HttpHost)context.GetAttribute(ExecutionContext.HttpTargetHost
// );
// if (authState.GetAuthScheme() == null)
// {
// AuthScope authScope = new AuthScope(targetHost.GetHostName(), targetHost.GetPort(
// ));
// authState.SetAuthScheme(new BasicScheme());
// authState.SetCredentials(creds);
// }
// }, 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.CurrentToken() != JsonToken.StartArray)
{
}
// ignore these tokens
while (jp.CurrentToken() == 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");
}
private Task ChangeFeedResponseHandler(Task <HttpResponseMessage> responseTask)
{
Misc.SafeDispose(ref changesFeedRequestTokenSource);
if (responseTask.IsCanceled || responseTask.IsFaulted)
{
if (!responseTask.IsCanceled)
{
var err = responseTask.Exception.Flatten();
Log.D(TAG, "ChangeFeedResponseHandler faulted.", err.InnerException ?? err);
Error = err.InnerException ?? err;
Stop();
}
return(Task.FromResult(false));
}
var response = responseTask.Result;
if (response == null)
{
return(Task.FromResult(false));
}
var status = response.StatusCode;
UpdateServerType(response);
if ((Int32)status >= 300 && !Misc.IsTransientError(status))
{
var msg = response.Content != null
? String.Format("Change tracker got error with status code: {0}", status)
: String.Format("Change tracker got error with status code: {0} and null response content", status);
Log.E(TAG, msg);
Error = new CouchbaseLiteException(msg, new Status(status.GetStatusCode()));
Stop();
response.Dispose();
return(Task.FromResult(false));
}
switch (mode)
{
case ChangeTrackerMode.LongPoll:
if (response.Content == null)
{
throw new CouchbaseLiteException("Got empty change tracker response", status.GetStatusCode());
}
Log.D(TAG, "Getting stream from change tracker response");
return(response.Content.ReadAsStreamAsync().ContinueWith(t => {
try {
backoff.ResetBackoff();
ProcessLongPollStream(t);
} finally {
response.Dispose();
}
}));
default:
return(response.Content.ReadAsStreamAsync().ContinueWith(t => {
try {
backoff.ResetBackoff();
ProcessOneShotStream(t);
} finally {
response.Dispose();
}
}));
}
}
HttpResponseMessage ChangeFeedResponseHandler(Task <HttpResponseMessage> responseTask)
{
var response = responseTask.Result;
if (response == null)
{
return(null);
}
var status = response.StatusCode;
if ((Int32)status >= 300 && !Misc.IsTransientError(status))
{
var msg = response.Content != null
? String.Format("Change tracker got error with status code: {0}", status)
: String.Format("Change tracker got error with status code: {0} and null response content", status);
Log.E(Tag, msg);
Error = new CouchbaseLiteException(msg, new Status(status.GetStatusCode()));
Stop();
return(response);
}
switch (mode)
{
case ChangeTrackerMode.LongPoll:
{
if (response.Content == null)
{
throw new CouchbaseLiteException("Got empty change tracker response", status.GetStatusCode());
}
var content = response.Content.ReadAsByteArrayAsync().Result;
IDictionary <string, object> fullBody;
try
{
fullBody = Manager.GetObjectMapper().ReadValue <IDictionary <string, object> >(content) ?? new Dictionary <string, object>();
}
catch (JsonSerializationException ex)
{
const string timeoutContent = "{\"results\":[";
if (!Encoding.UTF8.GetString(content).Trim().Equals(timeoutContent))
{
throw ex;
}
Log.V(Tag, "Timeout while waiting for changes.");
backoff.SleepAppropriateAmountOfTime();
return(response);
}
var responseOK = ReceivedPollResponse(fullBody);
if (responseOK)
{
Log.V(Tag, "Starting new longpoll");
backoff.ResetBackoff();
return(response);
}
else
{
Log.W(Tag, "Change tracker calling stop");
Stop();
}
}
break;
default:
{
var content = response.Content.ReadAsByteArrayAsync().Result;
var results = Manager.GetObjectMapper().ReadValue <IDictionary <String, Object> >(content.AsEnumerable());
Log.D(Tag, "Received results from changes feed: {0}", results);
var resultsValue = results["results"] as JArray;
foreach (var item in resultsValue)
{
IDictionary <String, Object> change = null;
try
{
change = item.ToObject <IDictionary <String, Object> >();
}
catch (Exception)
{
Log.E(Tag, this + string.Format(": Received unparseable change line from server: {0}", change));
}
if (!ReceivedChange(change))
{
Log.W(Tag, this + string.Format(": Received unparseable change line from server: {0}", change));
}
}
// As ReceivedChange() dispatches the change event to its client via WorkExecutor,
// to avoid the Stop() to be called before the client is done handling the change event,
// we need to setup the Stop() call with the WorkExecutor as well
// (Assuming that the WorkExecutor is a single thread executor).
WorkExecutor.StartNew(Stop);
return(response);
}
}
backoff.ResetBackoff();
return(response);
}
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(Log.TagChangeTracker, "%s: ChangeTracker run() loop aborting because client == null"
, this);
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();
backoff = new ChangeTrackerBackoff();
while (running)
{
Uri url = GetChangesFeedURL();
if (usePOST)
{
HttpPost postRequest = new HttpPost(url.ToString());
postRequest.SetHeader("Content-Type", "application/json");
StringEntity entity;
try
{
entity = new StringEntity(ChangesFeedPOSTBody());
}
catch (UnsupportedEncodingException e)
{
throw new RuntimeException(e);
}
postRequest.SetEntity(entity);
request = postRequest;
}
else
{
request = new HttpGet(url.ToString());
}
AddRequestHeaders(request);
// Perform BASIC Authentication if needed
bool isUrlBasedUserInfo = false;
// If the URL contains user info AND if this a DefaultHttpClient then preemptively set the auth credentials
string userInfo = url.GetUserInfo();
if (userInfo != null)
{
isUrlBasedUserInfo = true;
}
else
{
if (authenticator != null)
{
AuthenticatorImpl auth = (AuthenticatorImpl)authenticator;
userInfo = auth.AuthUserInfo();
}
}
if (userInfo != null)
{
if (userInfo.Contains(":") && !userInfo.Trim().Equals(":"))
{
string[] userInfoElements = userInfo.Split(":");
string username = isUrlBasedUserInfo ? URIUtils.Decode(userInfoElements[0]) : userInfoElements
[0];
string password = isUrlBasedUserInfo ? URIUtils.Decode(userInfoElements[1]) : userInfoElements
[1];
Credentials credentials = new UsernamePasswordCredentials(username, password);
if (httpClient is DefaultHttpClient)
{
DefaultHttpClient dhc = (DefaultHttpClient)httpClient;
MessageProcessingHandler preemptiveAuth = new _MessageProcessingHandler_285(credentials
);
dhc.AddRequestInterceptor(preemptiveAuth, 0);
}
}
else
{
Log.W(Log.TagChangeTracker, "RemoteRequest Unable to parse user info, not setting credentials"
);
}
}
try
{
string maskedRemoteWithoutCredentials = GetChangesFeedURL().ToString();
maskedRemoteWithoutCredentials = maskedRemoteWithoutCredentials.ReplaceAll("://.*:.*@"
, "://---:---@");
Log.V(Log.TagChangeTracker, "%s: Making request to %s", this, maskedRemoteWithoutCredentials
);
HttpResponse response = httpClient.Execute(request);
StatusLine status = response.GetStatusLine();
if (status.GetStatusCode() >= 300 && !Utils.IsTransientError(status))
{
Log.E(Log.TagChangeTracker, "%s: Change tracker got error %d", this, status.GetStatusCode
());
this.error = new HttpResponseException(status.GetStatusCode(), status.GetReasonPhrase
());
Stop();
}
HttpEntity entity = response.GetEntity();
InputStream input = null;
if (entity != null)
{
try
{
input = entity.GetContent();
if (mode == ChangeTracker.ChangeTrackerMode.LongPoll)
{
// continuous replications
IDictionary<string, object> fullBody = Manager.GetObjectMapper().ReadValue<IDictionary
>(input);
bool responseOK = ReceivedPollResponse(fullBody);
if (mode == ChangeTracker.ChangeTrackerMode.LongPoll && responseOK)
{
Log.V(Log.TagChangeTracker, "%s: Starting new longpoll", this);
backoff.ResetBackoff();
continue;
}
else
{
Log.W(Log.TagChangeTracker, "%s: Change tracker calling stop (LongPoll)", this);
Stop();
}
}
else
{
// one-shot replications
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(Log.TagChangeTracker, "Received unparseable change line from server: %s", change
);
}
}
Log.W(Log.TagChangeTracker, "%s: Change tracker calling stop (OneShot)", this);
Stop();
break;
}
backoff.ResetBackoff();
}
finally
{
try
{
entity.ConsumeContent();
}
catch (IOException)
{
}
}
}
}
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(Log.TagChangeTracker, this + ": Exception in change tracker", e);
}
backoff.SleepAppropriateAmountOfTime();
}
}
Log.V(Log.TagChangeTracker, "%s: Change tracker run loop exiting", this);
}
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(Log.TagChangeTracker, "%s: ChangeTracker run() loop aborting because client == null"
, this);
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();
backoff = new ChangeTrackerBackoff();
while (running)
{
Uri url = GetChangesFeedURL();
if (usePOST)
{
HttpPost postRequest = new HttpPost(url.ToString());
postRequest.SetHeader("Content-Type", "application/json");
StringEntity entity;
try
{
entity = new StringEntity(ChangesFeedPOSTBody());
}
catch (UnsupportedEncodingException e)
{
throw new RuntimeException(e);
}
postRequest.SetEntity(entity);
request = postRequest;
}
else
{
request = new HttpGet(url.ToString());
}
AddRequestHeaders(request);
// Perform BASIC Authentication if needed
bool isUrlBasedUserInfo = false;
// If the URL contains user info AND if this a DefaultHttpClient then preemptively set the auth credentials
string userInfo = url.GetUserInfo();
if (userInfo != null)
{
isUrlBasedUserInfo = true;
}
else
{
if (authenticator != null)
{
AuthenticatorImpl auth = (AuthenticatorImpl)authenticator;
userInfo = auth.AuthUserInfo();
}
}
if (userInfo != null)
{
if (userInfo.Contains(":") && !userInfo.Trim().Equals(":"))
{
string[] userInfoElements = userInfo.Split(":");
string username = isUrlBasedUserInfo ? URIUtils.Decode(userInfoElements[0]) : userInfoElements
[0];
string password = isUrlBasedUserInfo ? URIUtils.Decode(userInfoElements[1]) : userInfoElements
[1];
Credentials credentials = new UsernamePasswordCredentials(username, password);
if (httpClient is DefaultHttpClient)
{
DefaultHttpClient dhc = (DefaultHttpClient)httpClient;
MessageProcessingHandler preemptiveAuth = new _MessageProcessingHandler_285(credentials
);
dhc.AddRequestInterceptor(preemptiveAuth, 0);
}
}
else
{
Log.W(Log.TagChangeTracker, "RemoteRequest Unable to parse user info, not setting credentials"
);
}
}
try
{
string maskedRemoteWithoutCredentials = GetChangesFeedURL().ToString();
maskedRemoteWithoutCredentials = maskedRemoteWithoutCredentials.ReplaceAll("://.*:.*@"
, "://---:---@");
Log.V(Log.TagChangeTracker, "%s: Making request to %s", this, maskedRemoteWithoutCredentials
);
HttpResponse response = httpClient.Execute(request);
StatusLine status = response.GetStatusLine();
if (status.GetStatusCode() >= 300 && !Utils.IsTransientError(status))
{
Log.E(Log.TagChangeTracker, "%s: Change tracker got error %d", this, status.GetStatusCode
());
this.error = new HttpResponseException(status.GetStatusCode(), status.GetReasonPhrase
());
Stop();
}
HttpEntity entity = response.GetEntity();
InputStream input = null;
if (entity != null)
{
try
{
input = entity.GetContent();
if (mode == ChangeTracker.ChangeTrackerMode.LongPoll)
{
// continuous replications
IDictionary <string, object> fullBody = Manager.GetObjectMapper().ReadValue <IDictionary
>(input);
bool responseOK = ReceivedPollResponse(fullBody);
if (mode == ChangeTracker.ChangeTrackerMode.LongPoll && responseOK)
{
Log.V(Log.TagChangeTracker, "%s: Starting new longpoll", this);
backoff.ResetBackoff();
continue;
}
else
{
Log.W(Log.TagChangeTracker, "%s: Change tracker calling stop (LongPoll)", this);
Stop();
}
}
else
{
// one-shot replications
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(Log.TagChangeTracker, "Received unparseable change line from server: %s", change
);
}
}
Log.W(Log.TagChangeTracker, "%s: Change tracker calling stop (OneShot)", this);
Stop();
break;
}
backoff.ResetBackoff();
}
finally
{
try
{
entity.ConsumeContent();
}
catch (IOException)
{
}
}
}
}
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(Log.TagChangeTracker, this + ": Exception in change tracker", e);
}
backoff.SleepAppropriateAmountOfTime();
}
}
Log.V(Log.TagChangeTracker, "%s: Change tracker run loop exiting", this);
}
// TODO: Needs to refactored into smaller calls. Each continuation could be its own method, for example.
public 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(Tag, this + ": 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();
backoff = new ChangeTrackerBackoff();
var shouldBreak = false;
while (running)
{
if (tokenSource.Token.IsCancellationRequested)
{
break;
}
var url = GetChangesFeedURL();
Request = new HttpRequestMessage(HttpMethod.Get, url);
AddRequestHeaders(Request);
// if the URL contains user info AND if this a DefaultHttpClient
// then preemptively set/update the auth credentials
if (url.UserInfo != null)
{
Log.V(Tag, "url.getUserInfo(): " + url.GetUserInfo());
var credentials = Request.ToCredentialsFromUri();
if (credentials != null)
{
var handler = client.HttpHandler;
if (handler.Credentials == null || !handler.Credentials.Equals(credentials))
{
client.HttpHandler.Credentials = credentials;
}
}
else
{
Log.W(Tag, this + ": ChangeTracker Unable to parse user info, not setting credentials");
}
}
try
{
var requestStatus = CurrentRequest == null
? TaskStatus.Canceled
: CurrentRequest.Status;
Log.V(Tag, this + ": Current Request Status: " + requestStatus);
if (requestStatus == TaskStatus.Running || requestStatus == TaskStatus.WaitingForActivation)
{
//System.Threading.Thread.Sleep(5000);
continue;
}
var maskedRemoteWithoutCredentials = GetChangesFeedURL().ToString();
maskedRemoteWithoutCredentials = maskedRemoteWithoutCredentials.ReplaceAll("://.*:.*@", "://---:---@");
Log.V(Tag, this + ": Making request to " + maskedRemoteWithoutCredentials);
if (tokenSource.Token.IsCancellationRequested)
{
break;
}
CurrentRequest = httpClient.SendAsync(Request)
.ContinueWith <HttpResponseMessage>(request =>
{
if (request.Status != System.Threading.Tasks.TaskStatus.RanToCompletion && request.IsFaulted)
{
Log.E(Tag, this + ": Change tracker got error " + Extensions.ToString(request.Status));
throw request.Exception;
}
return(request.Result);
}, this.tokenSource.Token)
.ContinueWith <Task <Byte[]> >((request) =>
{
var status = request.Result.StatusCode;
if ((Int32)status >= 300)
{
var msg = String.Format("Change tracker got error: {0}", status);
Log.E(Tag, msg);
Error = new CouchbaseLiteException(msg, new Status(status.GetStatusCode()));
Stop();
}
return(request.Result.Content.ReadAsByteArrayAsync());
}, this.tokenSource.Token)
.ContinueWith((Task <Task <Byte[]> > response) =>
{
if (response.Status != System.Threading.Tasks.TaskStatus.RanToCompletion &&
!response.IsFaulted &&
response.Result != null)
{
return;
}
var result = response.Result.Result;
if (mode == ChangeTrackerMode.LongPoll)
{
var fullBody = Manager.GetObjectMapper().ReadValue <IDictionary <string, object> >(result.AsEnumerable());
var responseOK = ReceivedPollResponse(fullBody);
if (mode == ChangeTracker.ChangeTrackerMode.LongPoll && responseOK)
{
Log.V(Tag, this + ": Starting new longpoll");
backoff.ResetBackoff();
return;
}
else
{
Log.W(Tag, this + ": Change tracker calling stop");
Stop();
}
}
else
{
var results = Manager.GetObjectMapper().ReadValue <IDictionary <String, Object> >(result.AsEnumerable());
var resultsValue = results["results"] as Newtonsoft.Json.Linq.JArray;
foreach (var item in resultsValue)
{
IDictionary <String, Object> change = null;
try {
change = item.ToObject <IDictionary <String, Object> >();
} catch (Exception) {
Log.E(Tag, this + string.Format(": Received unparseable change line from server: {0}", change));
}
if (!ReceivedChange(change))
{
Log.W(Tag, this + string.Format(": Received unparseable change line from server: {0}", change));
}
}
Stop();
shouldBreak = true;
return;
}
backoff.ResetBackoff();
}, tokenSource.Token);
}
catch (Exception e)
{
if (!running && e is IOException)
{
// swallow
}
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(Tag, this + ": Exception in change tracker", e);
}
backoff.SleepAppropriateAmountOfTime();
}
if (shouldBreak)
{
break;
}
}
if (!tokenSource.Token.IsCancellationRequested)
{ // Handle cancellation requests while we are waiting.
// e.g. when Stop() is called from another thread.
try {
CurrentRequest.Wait(tokenSource.Token);
} catch (Exception) {
Log.V(Tag, this + ": Run loop was cancelled.");
}
}
Log.V(Tag, this + ": Change tracker run loop exiting");
}
void ChangeFeedResponseHandler(Task <HttpResponseMessage> responseTask)
{
if (responseTask.IsCanceled || responseTask.IsFaulted)
{
if (!responseTask.IsCanceled)
{
var err = responseTask.Exception.Flatten();
Log.D(Tag, "ChangeFeedResponseHandler faulted.", err.InnerException ?? err);
Error = err.InnerException ?? err;
backoff.SleepAppropriateAmountOfTime();
responseTask.Result.Dispose();
}
return;
}
var response = responseTask.Result;
if (response == null)
{
return;
}
var status = response.StatusCode;
if ((Int32)status >= 300 && !Misc.IsTransientError(status))
{
var msg = response.Content != null
? String.Format("Change tracker got error with status code: {0}", status)
: String.Format("Change tracker got error with status code: {0} and null response content", status);
Log.E(Tag, msg);
Error = new CouchbaseLiteException(msg, new Status(status.GetStatusCode()));
Stop();
response.Dispose();
return;
}
try {
switch (mode)
{
case ChangeTrackerMode.LongPoll:
{
if (response.Content == null)
{
throw new CouchbaseLiteException("Got empty change tracker response", status.GetStatusCode());
}
Log.D(Tag, "Getting stream from change tracker response");
Stream stream = response.Content.ReadAsStreamAsync().Result;
Log.D(Tag, "Got stream from change tracker response");
bool beforeFirstItem = true;
bool responseOK = false;
using (var jsonReader = Manager.GetObjectMapper().StartIncrementalParse(stream)) {
responseOK = ReceivedPollResponse(jsonReader, ref beforeFirstItem);
}
Log.D(Tag, "Finished polling change tracker");
if (responseOK)
{
Log.V(Tag, "Starting new longpoll");
backoff.ResetBackoff();
}
else
{
backoff.SleepAppropriateAmountOfTime();
if (beforeFirstItem)
{
var elapsed = DateTime.Now - _startTime;
Log.W(Tag, "Longpoll connection closed (by proxy?) after {0} sec", elapsed.TotalSeconds);
// Looks like the connection got closed by a proxy (like AWS' load balancer) while the
// server was waiting for a change to send, due to lack of activity.
// Lower the heartbeat time to work around this, and reconnect:
_heartbeatMilliseconds = (int)(elapsed.TotalMilliseconds * 0.75f);
Log.V(Tag, " Starting new longpoll");
backoff.ResetBackoff();
}
else
{
Log.W(Tag, "Change tracker calling stop");
WorkExecutor.StartNew(Stop);
}
}
}
break;
default:
{
Stream content = response.Content.ReadAsStreamAsync().Result;
using (var jsonReader = Manager.GetObjectMapper().StartIncrementalParse(content)) {
bool timedOut = false;
ReceivedPollResponse(jsonReader, ref timedOut);
}
IsRunning = false;
Stopped();
}
break;
}
backoff.ResetBackoff();
} finally {
response.Dispose();
}
}
// TODO: Needs to refactored into smaller calls. Each continuation could be its own method, for example.
public 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(Tag, this + ": 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();
backoff = new ChangeTrackerBackoff();
var shouldBreak = false;
while (running)
{
if (tokenSource.Token.IsCancellationRequested)
break;
var url = GetChangesFeedURL();
Request = new HttpRequestMessage(HttpMethod.Get, url);
AddRequestHeaders(Request);
// if the URL contains user info AND if this a DefaultHttpClient
// then preemptively set/update the auth credentials
if (url.UserInfo != null)
{
Log.V(Tag, "url.getUserInfo(): " + url.GetUserInfo());
var credentials = Request.ToCredentialsFromUri();
if (credentials != null)
{
var handler = client.HttpHandler;
if (handler.Credentials == null || !handler.Credentials.Equals(credentials))
client.HttpHandler.Credentials = credentials;
}
else
{
Log.W(Tag, this + ": ChangeTracker Unable to parse user info, not setting credentials");
}
}
try
{
var requestStatus = CurrentRequest == null
? TaskStatus.Canceled
: CurrentRequest.Status;
Log.V(Tag, this + ": Current Request Status: " + requestStatus);
if (requestStatus == TaskStatus.Running || requestStatus == TaskStatus.WaitingForActivation)
{
//System.Threading.Thread.Sleep(5000);
continue;
}
var maskedRemoteWithoutCredentials = GetChangesFeedURL().ToString();
maskedRemoteWithoutCredentials = maskedRemoteWithoutCredentials.ReplaceAll("://.*:.*@", "://---:---@");
Log.V(Tag, this + ": Making request to " + maskedRemoteWithoutCredentials);
if (tokenSource.Token.IsCancellationRequested)
break;
CurrentRequest = httpClient.SendAsync(Request)
.ContinueWith<HttpResponseMessage>(request=>
{
if (request.Status != System.Threading.Tasks.TaskStatus.RanToCompletion && request.IsFaulted)
{
Log.E(Tag, this + ": Change tracker got error " + Extensions.ToString(request.Status));
throw request.Exception;
}
return request.Result;
}, this.tokenSource.Token)
.ContinueWith<Task<Byte[]>>((request) =>
{
var status = request.Result.StatusCode;
if ((Int32)status >= 300)
{
var msg = String.Format("Change tracker got error: {0}", status);
Log.E(Tag, msg);
Error = new CouchbaseLiteException (msg, new Status (status.GetStatusCode ()));
Stop();
}
return request.Result.Content.ReadAsByteArrayAsync();
}, this.tokenSource.Token)
.ContinueWith((Task<Task<Byte[]>> response) =>
{
if (response.Status != System.Threading.Tasks.TaskStatus.RanToCompletion
&& !response.IsFaulted
&& response.Result != null)
return;
var result = response.Result.Result;
if (mode == ChangeTrackerMode.LongPoll)
{
var fullBody = Manager.GetObjectMapper().ReadValue<IDictionary<string, object>>(result.AsEnumerable());
var responseOK = ReceivedPollResponse(fullBody);
if (mode == ChangeTracker.ChangeTrackerMode.LongPoll && responseOK)
{
Log.V(Tag, this + ": Starting new longpoll");
backoff.ResetBackoff();
return;
}
else
{
Log.W(Tag, this + ": Change tracker calling stop");
Stop();
}
}
else
{
var results = Manager.GetObjectMapper().ReadValue<IDictionary<String, Object>>(result.AsEnumerable());
var resultsValue = results["results"] as Newtonsoft.Json.Linq.JArray;
foreach (var item in resultsValue)
{
IDictionary<String, Object> change = null;
try {
change = item.ToObject<IDictionary<String, Object>>();
} catch (Exception) {
Log.E(Tag, this + string.Format(": Received unparseable change line from server: {0}", change));
}
if (!ReceivedChange(change))
{
Log.W(Tag, this + string.Format(": Received unparseable change line from server: {0}", change));
}
}
Stop();
shouldBreak = true;
return;
}
backoff.ResetBackoff();
}, tokenSource.Token);
}
catch (Exception e)
{
if (!running && e is IOException)
{
// swallow
}
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(Tag, this + ": Exception in change tracker", e);
}
backoff.SleepAppropriateAmountOfTime();
}
if (shouldBreak) break;
}
if (!tokenSource.Token.IsCancellationRequested)
{ // Handle cancellation requests while we are waiting.
// e.g. when Stop() is called from another thread.
try {
CurrentRequest.Wait (tokenSource.Token);
} catch (Exception) {
Log.V(Tag, this + ": Run loop was cancelled.");
}
}
Log.V(Tag, this + ": Change tracker run loop exiting");
}
