private Yield UpdateHelper(string id, string rev, IPlay aDoc, Result<IPlay> aResult)
{
//Check if a play with this id exists.
Result<IPlay> validPlayResult = new Result<IPlay>();
yield return thePlayDataMapper.Retrieve(aDoc.Id, validPlayResult);
if (validPlayResult.Value == null)
{
aResult.Throw(new ArgumentException());
yield break;
}
//Check if the current user has the update rights.
if (!HasAuthorization(validPlayResult.Value))
{
aResult.Throw(new UnauthorizedAccessException());
yield break;
}
//Check if the source in the play exist and are not null.
Coroutine.Invoke(CheckSource, aDoc, new Result());
//Update and return the updated play.
Result<IPlay> playResult = new Result<IPlay>();
yield return thePlayDataMapper.Update(id, rev, aDoc, playResult);
aResult.Return(playResult.Value);
}
/// <summary>
/// <para>Deletes a single configuration value from a given section in the
/// CouchDB server configuration.</para>
/// <para>(This method is asynchronous.)</para>
/// </summary>
/// <param name="section">The configuration section.</param>
/// <param name="keyName">The name of the configuration key.</param>
/// <param name="result"></param>
/// <returns></returns>
public Result DeleteConfigValue(
string section,
string keyName,
Result result)
{
if (String.IsNullOrEmpty(section))
throw new ArgumentException("section cannot be null nor empty");
if (String.IsNullOrEmpty(keyName))
throw new ArgumentException("keyName cannot be null nor empty");
if (result == null)
throw new ArgumentNullException("result");
BasePlug
.At(Constants._CONFIG, XUri.EncodeFragment(section),
XUri.EncodeFragment(keyName))
.Delete(DreamMessage.Ok(), new Result<DreamMessage>())
.WhenDone(
a =>
{
if (a.Status == DreamStatus.Ok)
result.Return(); // remove " and "\n
else
result.Throw(new CouchException(a));
},
result.Throw
);
return result;
}
private Yield CheckSource(IPlay aPlay, Result aResult)
{
//can't be null, it must have a source
if (aPlay.SourceId == null)
{
aResult.Throw(new ArgumentException());
yield break;
}
// if this source exists
Result<bool> validSourceResult = new Result<bool>();
yield return Context.Current.Instance.SourceController.Exists(aPlay.SourceId, validSourceResult);
if (!validSourceResult.Value)
{
aResult.Throw(new ArgumentException());
yield break;
}
aResult.Return();
}
public Result<bool> Logoff(Result<bool> aResult)
{
if (aResult == null)
throw new ArgumentNullException("aResult");
BasePlug.At("_session").Delete(new Result<DreamMessage>()).WhenDone(
a => {
if (a.Status == DreamStatus.Ok)
aResult.Return(true);
else
aResult.Throw(new CouchException(a));
},
aResult.Throw
);
return aResult;
}
private Yield CreateHelper(IPlay aDoc, Result<IPlay> aResult)
{
//Check if user is set as we need to know the creator.
if (Context.Current.User == null)
{
aResult.Throw(new UnauthorizedAccessException());
yield break;
}
//Check that the sources aren't null and does exists
yield return Coroutine.Invoke(CheckSource, aDoc, new Result());
//Insert a the score and return
Result<IPlay> resultCreate = new Result<IPlay>();
yield return thePlayDataMapper.Create(aDoc, resultCreate);
aResult.Return(resultCreate.Value);
}
/* =========================================================================
* Asynchronous methods
* =======================================================================*/
/// <summary>
/// <para>Adds an attachment to a document. The document revision must be
/// specified when using this method.</para>
/// <para>(This method is asynchronous.)</para>
/// </summary>
/// <param name="id">ID of the CouchDB document.</param>
/// <param name="rev">Revision of the CouchDB document.</param>
/// <param name="attachment">Stream of the attachment. Will be closed once
/// the request is sent.</param>
/// <param name="attachmentLength">Length of the attachment stream.</param>
/// <param name="fileName">Filename of the attachment.</param>
/// <param name="contentType">Content type of the document.</param>
/// <param name="result"></param>
/// <returns></returns>
public Result<JObject> AddAttachment(
string id,
string rev,
Stream attachment,
long attachmentLength,
string fileName,
MimeType contentType,
Result<JObject> result)
{
if (String.IsNullOrEmpty(id))
throw new ArgumentNullException("id");
if (String.IsNullOrEmpty(rev))
throw new ArgumentNullException("rev");
if (attachment == null)
throw new ArgumentNullException("attachment");
if (attachmentLength < 0)
throw new ArgumentOutOfRangeException("attachmentLength");
if (String.IsNullOrEmpty(fileName))
throw new ArgumentNullException("fileName");
if (contentType == null)
throw new ArgumentNullException("contentType");
if (result == null)
throw new ArgumentNullException("result");
BasePlug
.AtPath(XUri.EncodeFragment(id))
.At(XUri.EncodeFragment(fileName))
.With(Constants.REV, rev)
.Put(DreamMessage.Ok(contentType, attachmentLength, attachment),
new Result<DreamMessage>())
.WhenDone(
a =>
{
if (a.Status == DreamStatus.Created)
result.Return(JObject.Parse(a.ToText()));
else
result.Throw(new CouchException(a));
},
result.Throw
);
return result;
}
public Result<User> GetUser(string username, Result<User> aResult)
{
theServiceUri.At("users", username)
.Get(new Result<DreamMessage>())
.WhenDone(delegate(Result<DreamMessage> answer)
{
if (!answer.Value.IsSuccessful)
{
if (answer.Value.Status == DreamStatus.NotFound)
aResult.Return((User)null);
aResult.Throw(answer.Exception);
}
else
{
aResult.Return(new User(JObject.Parse(answer.Value.ToText())));
}
}
);
return aResult;
}
/* =========================================================================
* Asynchronous methods
* =======================================================================*/
/// <summary>
/// <para>Restarts the CouchDB instance. You must be authenticated as a user
/// with administration privileges for this to work.</para>
/// <para>(This method is asynchronous.)</para>
/// </summary>
/// <param name="result"></param>
/// <returns></returns>
public Result RestartServer(Result result)
{
if (result == null)
throw new ArgumentNullException("result");
BasePlug
.At(Constants._RESTART)
.Post(DreamMessage.Ok(MimeType.JSON, String.Empty),
new Result<DreamMessage>())
.WhenDone(
a =>
{
if (a.Status == DreamStatus.Ok)
result.Return();
else
result.Throw(new CouchException(a));
},
result.Throw
);
return result;
}
public Result<bool> BulkFascimile(string sourceId, Stream file, Result<bool> aResult)
{
theServiceUri
.At("sources",sourceId,"fascimiles")
.Post(DreamMessage.Ok(new MimeType("application/zip"), file.Length, file),new Result<DreamMessage>())
.WhenDone(delegate(Result<DreamMessage> answer)
{
if (!answer.Value.IsSuccessful)
{
if (answer.Value.Status == DreamStatus.BadRequest)
aResult.Return(false);
else
aResult.Throw(answer.Exception);
}
else
{
aResult.Return(true);
}
}
);
return aResult;
}
public Result<bool> IsLogged(Result<bool> aResult)
{
if (aResult == null)
throw new ArgumentNullException("aResult");
BasePlug.At("_session").Get(new Result<DreamMessage>()).WhenDone(
a =>
{
if (a.Status == DreamStatus.Ok)
{
JObject user = JObject.Parse(a.ToText());
aResult.Return(user["info"]["authenticated"] != null);
}
else
{
aResult.Throw(new CouchException(a));
}
},
aResult.Throw
);
return aResult;
}
/// <summary>
/// Creates a database
/// </summary>
/// <param name="aDatabaseName">Name of new database</param>
/// <param name="aResult"></param>
/// <returns></returns>
public Result<JObject> CreateDatabase(string aDatabaseName, Result<JObject> aResult)
{
if (String.IsNullOrEmpty(aDatabaseName))
throw new ArgumentException("DatabaseName cannot be null nor empty");
if (aResult == null)
throw new ArgumentNullException("aResult");
BasePlug.At(XUri.EncodeFragment(aDatabaseName)).Put(DreamMessage.Ok(), new Result<DreamMessage>()).WhenDone(
a =>
{
if (a.Status == DreamStatus.Created)
{
aResult.Return(JObject.Parse(a.ToText()));
}
else
{
aResult.Throw(new CouchException(a));
}
},
aResult.Throw
);
return aResult;
}
/// <summary>
/// <para>Deletes the specified database.</para>
/// <para>(This method is asynchronous.)</para>
/// </summary>
/// <param name="databaseName">Name of the database to delete.</param>
/// <param name="result"></param>
/// <returns></returns>
public Result<JObject> DeleteDatabase(
string databaseName,
Result<JObject> result)
{
if (String.IsNullOrEmpty(databaseName))
throw new ArgumentException("databaseName cannot be null nor empty");
if (result == null)
throw new ArgumentNullException("result");
BasePlug
.At(XUri.EncodeFragment(databaseName))
.Delete(new Result<DreamMessage>())
.WhenDone(
a =>
{
if (a.Status == DreamStatus.Ok)
result.Return(JObject.Parse(a.ToText()));
else
result.Throw(new CouchException(a));
},
result.Throw
);
return result;
}
private Yield LoadContactsHelper(Result<ViewResult<string,string, Contact>> aResult)
{
Result<bool> exists = new Result<bool>();
yield return theDatabase.DocumentExists("_design/contactview", exists);
if(exists.HasException){
aResult.Throw(exists.Exception);
yield break;
}
if (!exists.Value)
{
CouchDesignDocument view = new CouchDesignDocument("contactview");
view.Views.Add("all",
new CouchView(
@"function(doc){
if(doc.type && doc.type == 'contact'){
emit(doc.lastName, doc.firstName)
}
}"));
Result<CouchDesignDocument> creationResult = new Result<CouchDesignDocument>();
yield return theDatabase.CreateDocument(view, creationResult);
if(creationResult.HasException)
{
aResult.Throw(creationResult.Exception);
yield break;
}
}
var viewRes = new Result<ViewResult<string, string, Contact>>();
yield return theDatabase.GetView("contactview", "all",viewRes);
if(viewRes.HasException)
{
aResult.Throw(viewRes.Exception);
yield break;
}
aResult.Return(viewRes.Value);
}
private Yield DeleteHelper(string id, string rev, Result<bool> aResult)
{
//Check if a source with this id exists.
Result<ISource> validSourceResult = new Result<ISource>();
yield return theSourceDataMapper.Retrieve(id, validSourceResult);
if (validSourceResult.Value == null)
{
aResult.Throw(new ArgumentException(String.Format("Source not found for id '{0}'", id)));
yield break;
}
yield return theSourceDataMapper.Delete(id, rev ?? validSourceResult.Value.Rev, aResult);
}
private Result<IssueData[]> ProcessIssueBatch(ElasticThreadPool pool, string projectId, string filterId, int pageNumber, int issuesInBatch, Tuplet<bool> canceled, Result<IssueData[]> result) {
pool.QueueWorkItem(HandlerUtil.WithEnv(delegate {
// TODO (steveb): use result.IsCanceled instead of shared tuple once cancellation is supported on the result object
// check if request has been canceled
if(!canceled.Item1) {
IssueData[] issuesForBatch;
if(!string.IsNullOrEmpty(filterId)) {
issuesForBatch = _service.mc_filter_get_issues(_username, _password, projectId, filterId, pageNumber.ToString(), issuesInBatch.ToString());
} else {
issuesForBatch = _service.mc_project_get_issues(_username, _password, projectId, pageNumber.ToString(), issuesInBatch.ToString());
}
result.Return(issuesForBatch);
} else {
// TODO (steveb): throw a more specific exception
result.Throw(new Exception("unspecified error"));
}
},TaskEnv.Clone()));
return result;
}
private Result Write(Action<string> activity, Stream stream, byte[] buffer, int offset, int count, Result result)
{
// asynchronously execute read operation
Result<IAsyncResult> inner = new Result<IAsyncResult>(TimeSpan.MaxValue);
inner.WhenDone(delegate(Result<IAsyncResult> _unused) {
try {
activity(string.Format("pre {0}!EndWrite", stream.GetType().FullName));
stream.EndWrite(inner.Value);
activity("post EndWrite");
result.Return();
} catch(Exception e) {
activity("throw Write 1");
result.Throw(e);
}
});
try {
activity(string.Format("pre {0}!BeginWrite", stream.GetType().FullName));
stream.BeginWrite(buffer, offset, count, inner.Return, stream);
activity("post BeginWrite");
} catch(Exception e) {
activity("throw Write 2");
result.Throw(e);
}
// return yield handle
return result;
}
private Yield UpdateHelper(string id, string rev, ISource aDoc, Result<ISource> aResult)
{
//Check if a source with this id exists.
Result<ISource> validSourceResult = new Result<ISource>();
yield return theSourceDataMapper.Retrieve(id, validSourceResult);
if (validSourceResult.Value == null)
{
aResult.Throw(new ArgumentException(String.Format("Source not found for id '{0}'",id)));
yield break;
}
//Update and return the updated source.
Result<ISource> sourceResult = new Result<ISource>();
yield return theSourceDataMapper.Update(id, rev ?? validSourceResult.Value.Rev , aDoc, sourceResult);
aResult.Return(sourceResult.Value);
}
public Result<JObject> TriggerReplication(ReplicationOptions aReplicationOptions, Result<JObject> aResult)
{
if (aReplicationOptions == null)
throw new ArgumentNullException("aReplicationOptions");
if (aResult == null)
throw new ArgumentNullException("aResult");
Plug p = BasePlug.At(Constants.REPLICATE);
string json = aReplicationOptions.ToString();
p.Post(DreamMessage.Ok(MimeType.JSON, json), new Result<DreamMessage>()).WhenDone(
a =>
{
if((a.Status == DreamStatus.Accepted)||
(a.Status == DreamStatus.Ok))
{
aResult.Return(JObject.Parse(a.ToText()));
}
else
{
aResult.Throw(new CouchException(a));
}
},
aResult.Throw
);
return aResult;
}
private Yield UpdateHelper(string id, string rev, IScore aDoc, Result<IScore> aResult)
{
//Check if a score with this id exists.
Result<IScore> validScoreResult = new Result<IScore>();
yield return theScoreDataMapper.Retrieve(aDoc.Id, validScoreResult);
if (validScoreResult.Value == null)
{
aResult.Throw(new ArgumentException());
yield break;
}
//Check if the sources in the score exists and are not null.
Coroutine.Invoke(CheckSources, aDoc, new Result());
//Update and return the updated score.
Result<IScore> scoreResult = new Result<IScore>();
yield return theScoreDataMapper.Update(id, rev, aDoc, scoreResult);
aResult.Return(scoreResult.Value);
}
private Yield GetPlaysFromSourceHelper(int offset, int max, string aSourceId, Result<SearchResult<IPlay>> aResult)
{
//Check if the play exists
Result<bool> resultExists = new Result<bool>();
yield return Context.Current.Instance.SourceController.Exists(aSourceId, resultExists);
if (resultExists.Value)
{
//Get the plays that have this source id as textual or musical source.
Result<SearchResult<IPlay>> resultSearch = new Result<SearchResult<IPlay>>();
yield return thePlayDataMapper.GetPlaysFromSource(offset, max, aSourceId, resultSearch);
aResult.Return(resultSearch.Value);
}
else
aResult.Throw(new DreamNotFoundException("Source not found"));
}
public Result<Dictionary<string, Dictionary<string, string>>> GetConfig(Result<Dictionary<string, Dictionary<string, string>>> aResult)
{
if (aResult == null)
throw new ArgumentNullException("aResult");
BasePlug.At(Constants.CONFIG).Get(DreamMessage.Ok(), new Result<DreamMessage>()).WhenDone(
a =>
{
if (a.Status == DreamStatus.Ok)
aResult.Return(JsonConvert.DeserializeObject<Dictionary<string, Dictionary<string, string>>>(a.ToText()));
else
aResult.Throw(new CouchException(a));
},
aResult.Throw
);
return aResult;
}
/// <summary>
/// Perform Cookie base authentication with given username and password
/// Resulting cookie will be automatically used for all subsequent requests
/// </summary>
/// <param name="aUserName">User Name</param>
/// <param name="aPassword">Password</param>
/// <param name="aResult"></param>
/// <returns>true if authentication succeed</returns>
public Result<bool> Logon(string aUserName, string aPassword, Result<bool> aResult)
{
if (String.IsNullOrEmpty(aUserName))
throw new ArgumentException("aUserName cannot be null nor empty");
if (String.IsNullOrEmpty(aPassword))
throw new ArgumentException("aPassword cannot be null nor empty");
if (aResult == null)
throw new ArgumentNullException("aResult");
string content = String.Format("name={0}&password={1}", aUserName, aPassword);
BasePlug.At("_session").Post(DreamMessage.Ok(MimeType.FORM_URLENCODED,content), new Result<DreamMessage>()).WhenDone(
a => {
switch(a.Status)
{
case DreamStatus.Ok:
BasePlug.CookieJar.Update(a.Cookies, new XUri(BasePlug.Uri.SchemeHostPort));
BasePlug = BasePlug.WithHeader("X-CouchDB-WWW-Authenticate", "Cookie");
aResult.Return(true);
break;
default:
aResult.Throw(new CouchException(a));
break;
}
},
aResult.Throw
);
return aResult;
}
private Result<DreamMessage> SubmitRequestAsync(string verb, XUri uri, IPrincipal user, DreamMessage request, Result<DreamMessage> response, Action completion)
{
if(string.IsNullOrEmpty(verb)) {
if(completion != null) {
completion();
}
throw new ArgumentNullException("verb");
}
if(uri == null) {
if(completion != null) {
completion();
}
throw new ArgumentNullException("uri");
}
if(request == null) {
if(completion != null) {
completion();
}
throw new ArgumentNullException("request");
}
if(response == null) {
if(completion != null) {
completion();
}
throw new ArgumentNullException("response");
}
// ensure environment is still running
if(!IsRunning) {
response.Return(DreamMessage.InternalError("host not running"));
if(completion != null) {
completion();
}
return response;
}
try {
Interlocked.Increment(ref _requestCounter);
// check if we were not able to begin processing the request
DreamMessage failed = BeginRequest(completion, uri, request);
if(failed != null) {
response.Return(failed);
EndRequest(completion, uri, request);
return response;
}
// check if 'verb' is overwritten by a processing parameter
verb = verb.ToUpperInvariant();
string requestedVerb = (uri.GetParam(DreamInParam.VERB, null) ?? request.Headers.MethodOverride ?? verb).ToUpperInvariant();
if(
verb.EqualsInvariant(Verb.POST) || (
verb.EqualsInvariant(Verb.GET) && (
requestedVerb.EqualsInvariant(Verb.OPTIONS) ||
requestedVerb.EqualsInvariant(Verb.HEAD)
)
)
) {
verb = requestedVerb;
}
// check if an origin was specified
request.Headers.DreamOrigin = uri.GetParam(DreamInParam.ORIGIN, request.Headers.DreamOrigin);
// check if a public uri is supplied
XUri publicUri = XUri.TryParse(uri.GetParam(DreamInParam.URI, null) ?? request.Headers.DreamPublicUri);
XUri transport = XUri.TryParse(request.Headers.DreamTransport) ?? uri.WithoutCredentialsPathQueryFragment();
if(publicUri == null) {
// check if request is local
if(transport.Scheme.EqualsInvariantIgnoreCase("local")) {
// local:// uris with no public-uri specifier default to the configured public-uri
publicUri = _publicUri;
} else {
// check if the request was forwarded through Apache mod_proxy
string proxyOverride = uri.GetParam(DreamInParam.HOST, null);
if(string.IsNullOrEmpty(proxyOverride)) {
proxyOverride = request.Headers.ForwardedHost;
}
string serverPath = string.Join("/", transport.Segments);
if(proxyOverride != null) {
// request used an override, append path of public-uri
serverPath = string.Join("/", _publicUri.Segments);
}
// set the uri scheme based-on the incoming scheme and the override header
string scheme = transport.Scheme;
if("On".EqualsInvariantIgnoreCase(request.Headers.FrontEndHttps ?? "")) {
scheme = Scheme.HTTPS;
}
scheme = uri.GetParam(DreamInParam.SCHEME, scheme);
// set the host port
string hostPort = proxyOverride ?? request.Headers.Host ?? uri.HostPort;
publicUri = new XUri(string.Format("{0}://{1}", scheme, hostPort)).AtPath(serverPath);
}
request.Headers.DreamPublicUri = publicUri.ToString();
}
// set host header
request.Headers.Host = publicUri.HostPort;
// convert incoming uri to local://
XUri localFeatureUri = uri.ChangePrefix(uri.WithoutPathQueryFragment(), _localMachineUri);
// check if path begins with public uri path
if((transport.Segments.Length > 0) && localFeatureUri.PathStartsWith(transport.Segments)) {
localFeatureUri = localFeatureUri.WithoutFirstSegments(transport.Segments.Length);
}
// check if the path is the application root and whether we have special behavior for that
if(localFeatureUri.Path.IfNullOrEmpty("/") == "/") {
if(!string.IsNullOrEmpty(_rootRedirect)) {
localFeatureUri = localFeatureUri.AtAbsolutePath(_rootRedirect);
} else if(IsDebugEnv) {
localFeatureUri = localFeatureUri.AtAbsolutePath("/host/services");
}
}
// find the requested feature
List<DreamFeature> features;
lock(_features) {
features = _features.Find(localFeatureUri);
}
DreamFeature feature = null;
if(features != null) {
// TODO (steveb): match the incoming mime-type to the feature's acceptable mime-types (mime-type overloading)
// match the request verb to the feature verb
foreach(DreamFeature entry in features) {
if((entry.Verb == "*") || entry.Verb.EqualsInvariant(verb)) {
feature = entry;
break;
}
}
// check if this is an OPTIONS request and there is no defined feature for it
if(verb.EqualsInvariant(Verb.OPTIONS) && ((feature == null) || feature.Verb.EqualsInvariant("*"))) {
// list all allowed methods
List<string> methods = new List<string>();
foreach(DreamFeature entry in features) {
if(!methods.Contains(entry.Verb)) {
methods.Add(entry.Verb);
}
}
methods.Sort(StringComparer.Ordinal.Compare);
DreamMessage result = DreamMessage.Ok();
result.Headers.Allow = string.Join(", ", methods.ToArray());
response.Return(result);
// decrease counter for external requests
EndRequest(completion, uri, request);
return response;
}
}
// check if a feature was found
if(feature == null) {
DreamMessage result;
// check if any feature was found
if((features == null) || (features.Count == 0)) {
string msg = verb + " URI: " + uri.ToString(false) + " LOCAL: " + localFeatureUri.ToString(false) + " PUBLIC: " + publicUri + " TRANSPORT: " + transport;
_log.WarnMethodCall("ProcessRequest: feature not found", msg);
result = DreamMessage.NotFound("resource not found");
} else {
string msg = verb + " " + uri.ToString(false);
_log.WarnMethodCall("ProcessRequest: method not allowed", msg);
List<string> methods = new List<string>();
foreach(DreamFeature entry in features) {
if(!methods.Contains(entry.Verb)) {
methods.Add(entry.Verb);
}
}
methods.Sort(StringComparer.Ordinal.Compare);
result = DreamMessage.MethodNotAllowed(methods.ToArray(), "allowed methods are " + string.Join(", ", methods.ToArray()));
}
response.Return(result);
// decrease counter for external requests
EndRequest(completion, uri, request);
return response;
}
// add uri to aliases list
if(_memorizeAliases) {
lock(_aliases) {
_aliases[transport] = transport;
_aliases[publicUri] = publicUri;
}
}
// create context
DreamContext context = new DreamContext(this, verb, localFeatureUri, feature, publicUri, _publicUri, request, CultureInfo.InvariantCulture, GetRequestLifetimeScopeFactory(feature.Service));
// attach request id to the context
context.SetState(DreamHeaders.DREAM_REQUEST_ID, request.Headers.DreamRequestId);
// add user to context
context.User = user;
// build linked-list of feature calls
var chain = new Result<DreamMessage>(TimeSpan.MaxValue, TaskEnv.Current).WhenDone(result => {
// extract message
DreamMessage message;
if(result.HasValue) {
message = result.Value;
} else if(result.Exception is DreamAbortException) {
message = ((DreamAbortException)result.Exception).Response;
} else if(result.Exception is DreamCachedResponseException) {
message = ((DreamCachedResponseException)result.Exception).Response;
} else {
_log.ErrorExceptionFormat(response.Exception, "Failed Feature '{0}' Chain [{1}:{2}]: {3}",
feature.MainStage.Name,
verb,
localFeatureUri.Path,
response.Exception.Message
);
message = DreamMessage.InternalError(result.Exception);
}
// decrease counter for external requests
EndRequest(completion, uri, request);
// need to manually dispose of the context, since we're already attaching and detaching it by hand to TaskEnvs throughout the chain
if(response.IsCanceled) {
_log.DebugFormat("response for '{0}' has already returned", context.Uri.Path);
response.ConfirmCancel();
((ITaskLifespan)context).Dispose();
} else {
((ITaskLifespan)context).Dispose();
response.Return(message);
}
});
for(int i = feature.Stages.Length - 1; i >= 0; --i) {
var link = new DreamFeatureChain(feature.Stages[i], i == feature.MainStageIndex, context, chain, (i > 0) ? feature.Stages[i - 1].Name : "first");
chain = new Result<DreamMessage>(TimeSpan.MaxValue, TaskEnv.Current).WhenDone(link.Handler);
}
// kick-off new task
AsyncUtil.Fork(
() => chain.Return(request),
TaskEnv.New(TimerFactory),
new Result(TimeSpan.MaxValue, response.Env).WhenDone(res => {
if(!res.HasException) {
return;
}
_log.ErrorExceptionFormat(res.Exception, "handler for {0}:{1} failed", context.Verb, context.Uri.ToString(false));
((ITaskLifespan)context).Dispose();
// forward exception to recipient
response.Throw(res.Exception);
// decrease counter for external requests
EndRequest(completion, uri, request);
})
);
} catch(Exception e) {
response.Throw(e);
EndRequest(completion, uri, request);
}
return response;
}
public Result<Dictionary<string, string>> GetConfigSection(string aSection, Result<Dictionary<string, string>> aResult)
{
if (aSection == null)
throw new ArgumentNullException("aSection");
if (aResult == null)
throw new ArgumentNullException("aResult");
if (String.IsNullOrEmpty(aSection))
throw new ArgumentException("Section cannot be empty");
BasePlug.At(Constants.CONFIG,XUri.EncodeFragment(aSection)).Get(DreamMessage.Ok(), new Result<DreamMessage>()).WhenDone(
a =>
{
switch(a.Status)
{
case DreamStatus.Ok:
aResult.Return(JsonConvert.DeserializeObject<Dictionary<string, string>>(a.ToText()));
break;
case DreamStatus.NotFound:
aResult.Return(new Dictionary<string, string>());
break;
default:
aResult.Throw(new CouchException(a));
break;
}
},
aResult.Throw
);
return aResult;
}
public Result<string> GetConfigValue(string aSection, string aKeyName, Result<string> aResult)
{
if (String.IsNullOrEmpty(aSection))
throw new ArgumentException("aSection cannot be null nor empty");
if (String.IsNullOrEmpty(aKeyName))
throw new ArgumentException("aKeyName cannot be null nor empty");
if (aResult == null)
throw new ArgumentNullException("aResult");
BasePlug.At(Constants.CONFIG,XUri.EncodeFragment(aSection),XUri.EncodeFragment(aKeyName)).Get(DreamMessage.Ok(), new Result<DreamMessage>()).WhenDone(
a =>
{
string value = a.ToText();
switch(a.Status)
{
case DreamStatus.Ok:
aResult.Return(value.Substring(1, value.Length - 3));// remove " and "\n
break;
case DreamStatus.NotFound:
aResult.Return((string)null);
break;
default:
aResult.Throw(new CouchException(a));
break;
}
},
aResult.Throw
);
return aResult;
}
private void ReturnUserError(Exception exception, Result<DreamMessage> response) {
var dreamException = exception as DreamResponseException;
if(dreamException != null) {
response.Throw(new DreamAbortException(dreamException.Response));
} else if(exception is UserException) {
response.Throw(new DreamBadRequestException(exception.Message));
} else {
response.Throw(exception);
}
}
//--- Methods ---
/// <summary>
/// Invoke the stage method.
/// </summary>
/// <param name="context"><see cref="DreamContext"/> for invocation.</param>
/// <param name="request"><see cref="DreamMessage"/> for invocation.</param>
/// <param name="response"><see cref="Result{DreamMessage}"/> for invocations.</param>
public void Invoke(DreamContext context, DreamMessage request, Result<DreamMessage> response)
{
if(_handler != null) {
Coroutine.Invoke(_handler, context, request, response);
} else {
try {
// build parameter list
var arguments = new object[_plan.Count];
for(int i = 0; i < _plan.Count; ++i) {
try {
arguments[i] = _plan[i].Invoke(context, request, response);
} catch(DreamException e) {
throw e;
} catch(Exception e) {
throw new FeatureArgumentParseException(_plan[i].ArgumentName, e);
}
}
// invoke method
if(_method.ReturnType == typeof(Yield)) {
// invoke method as coroutine
new Coroutine(_method, response).Invoke(() => (Yield)_method.InvokeWithRethrow(_service, arguments));
} else if(_method.ReturnType == typeof(XDoc)) {
// invoke method to get XDoc response (always an Ok)
var doc = _method.InvokeWithRethrow(_service, arguments) as XDoc;
response.Return(DreamMessage.Ok(doc));
} else {
response.Return((DreamMessage)_method.InvokeWithRethrow(_service, arguments));
}
} catch(Exception e) {
response.Throw(e);
}
}
}
/// <summary>
/// Retrieve list of available databases on the server
/// </summary>
/// <param name="aResult"></param>
/// <returns></returns>
public Result<IEnumerable<string>> GetAllDatabases(Result<IEnumerable<string>> aResult)
{
if (aResult == null)
throw new ArgumentNullException("aResult");
BasePlug.At("_all_dbs").Get(new Result<DreamMessage>()).WhenDone(
a =>
{
if (a.Status == DreamStatus.Ok)
{
var d = JArray.Parse(a.ToText());
aResult.Return(d.Values<string>());
}
else
{
aResult.Throw(new CouchException(a));
}
},
aResult.Throw
);
return aResult;
}
private Yield Memorize_Helper(long max, Result result) {
// NOTE (steveb): this method is used to load an external stream into memory; this alleviates the problem of streams not being closed for simple operations
if(max < 0) {
max = long.MaxValue - 1;
}
// check if we already know that the stream will not fit
long length = ContentLength;
if(length > max) {
// mark stream as closed
_stream.Close();
_stream = null;
_streamOpen = false;
// throw size exceeded exception
result.Throw(new InternalBufferOverflowException("message body exceeded max size"));
yield break;
}
if(length < 0) {
length = long.MaxValue;
}
// NOTE: the content-length and body length may differ (e.g. HEAD verb)
// copy contents asynchronously
var buffer = new MemoryStream();
Result<long> res;
// TODO (steveb): use WithCleanup() to dispose of resources in case of failure
yield return res = _stream.CopyToStream(buffer, Math.Min(length, max + 1), new Result<long>(TimeSpan.MaxValue)).Catch();
// mark stream as closed
_stream.Close();
_stream = null;
_streamOpen = false;
// confirm successful outcome for asynchronous operation
res.Confirm();
if(buffer.Length > max) {
result.Throw(new InternalBufferOverflowException("message body exceeded max size"));
yield break;
}
buffer.Position = 0;
_stream = buffer;
result.Return();
}
public Result SetConfigValue(string aSection, string aKeyName, string aValue, Result aResult)
{
if (String.IsNullOrEmpty(aSection))
throw new ArgumentException("aSection cannot be null nor empty");
if (String.IsNullOrEmpty(aKeyName))
throw new ArgumentException("aKeyName cannot be null nor empty");
if (aResult == null)
throw new ArgumentNullException("aResult");
if (aValue == null)
return DeleteConfigValue(aSection, aKeyName, aResult);
BasePlug.At(Constants.CONFIG, XUri.EncodeFragment(aSection), XUri.EncodeFragment(aKeyName)).Put(DreamMessage.Ok(MimeType.TEXT, "\"" + aValue + "\""), new Result<DreamMessage>()).WhenDone(
a =>
{
if (a.Status == DreamStatus.Ok)
aResult.Return();
else
aResult.Throw(new CouchException(a));
},
aResult.Throw
);
return aResult;
}
