/// <summary>
/// This method resolves the appropriate transport serialzer from the incoming accept header.
/// </summary>
/// <param name="rs">The incoming response.</param>
/// <param name="transport">The resolve transport serializer.</param>
/// <returns>Returns true if the serializer can be resolved.</returns>
protected virtual void ExtractHeaders <KT>(HttpResponseMessage rs, RepositoryHolder <KT> holder, IKeyMapper <KT> keyMapper)
{
string contentId = rs.Headers.Where((h) => h.Key.Equals("x-img-contentid", StringComparison.InvariantCultureIgnoreCase))
.SelectMany((h) => h.Value).FirstOrDefault() ?? "";
string versionId = rs.Headers.Where((h) => h.Key.Equals("x-img-versionid", StringComparison.InvariantCultureIgnoreCase))
.SelectMany((h) => h.Value).FirstOrDefault() ?? "";
holder.KeyReference = new Tuple <string, string>(contentId, versionId);
if (!string.IsNullOrEmpty(contentId))
{
holder.Key = keyMapper.ToKey(contentId);
}
}
/// <summary>
/// This method marshals the RepositoryHolder and transmits it to the remote Microservice.
/// </summary>
/// <typeparam Name="KT">The key type.</typeparam>
/// <typeparam Name="ET">The entity type.</typeparam>
/// <param Name="actionType">The action type.</param>
/// <param Name="rq">The repository holder request.</param>
/// <returns>Returns an async task that will be signalled when the request completes or times out.</returns>
protected override async Task <RepositoryHolder <KT, ET> > TransmitInternal <KT, ET>(
string actionType, RepositoryHolder <KT, ET> rq, ProcessOptions?routing = null, IPrincipal principal = null)
{
try
{
StatisticsInternal.ActiveIncrement();
var payload = TransmissionPayload.Create(Policy.TransmissionPayloadTraceEnabled);
payload.SecurityPrincipal = TransmissionPayload.ConvertToClaimsPrincipal(principal ?? Thread.CurrentPrincipal);
// Set the process correlation key to the correlation id if passed through the rq settings
if (!string.IsNullOrEmpty(rq.Settings?.CorrelationId))
{
payload.Message.ProcessCorrelationKey = rq.Settings.CorrelationId;
}
bool processAsync = rq.Settings?.ProcessAsync ?? false;
payload.Message.ChannelPriority = processAsync ? 0 : 1;
payload.Options = routing ?? RoutingDefault ?? ProcessOptions.RouteExternal;
payload.Message.Blob = PayloadSerializer.PayloadSerialize(rq);
payload.Message.ResponseChannelId = ResponseChannelId;
payload.Message.ResponseChannelId = ResponseId.Header.ChannelId;
payload.Message.ResponseMessageType = ResponseId.Header.MessageType;
payload.Message.ResponseActionType = ResponseId.Header.ActionType;
payload.Message.ResponseChannelPriority = payload.Message.ChannelPriority;
payload.Message.ChannelId = ChannelId;
payload.Message.MessageType = EntityType;
payload.Message.ActionType = actionType;
payload.MaxProcessingTime = rq.Settings?.WaitTime ?? mDefaultRequestTimespan;
return(await OutgoingRequestOut(payload, ProcessResponse <KT, ET>, processAsync));
}
catch (Exception ex)
{
string key = rq != null && rq.Key != null?rq.Key.ToString() : string.Empty;
Collector?.LogException($"Error transmitting {actionType}-{key} internally", ex);
throw;
}
}
public PersistenceRepositoryHolder(RepositoryHolder <K, E> holder = null)
{
IsTimeout = false;
Retry = 0;
ShouldLogEventSource = true;
if (holder != null)
{
Entity = holder.Entity;
Key = holder.Key;
KeyReference = holder.KeyReference;
Settings = holder.Settings;
ResponseCode = holder.ResponseCode;
ResponseMessage = holder.ResponseMessage;
TraceId = holder.TraceId;
}
Settings = Settings ?? new RepositorySettings();
}
public PersistencePayloadLogEvent(TransmissionPayload payload, RepositoryHolder request, RepositoryHolder response, LoggingLevel?level = null
, Exception ex = null, DispatcherLoggerDirection?direction = null, TimeSpan?processingTime = null)
: base(payload, level, ex, direction, processingTime)
{
if (request != null)
{
TraceId = request.TraceId;
if (request.Settings != null)
{
BatchId = request.Settings.BatchId;
Prefer = request.Settings.Prefer;
Headers = request.Settings.Headers;
}
}
if (response != null)
{
ResponseCode = response.ResponseCode;
ResponseMessage = response.ResponseMessage;
}
}
public virtual async Task <IHttpActionResult> Search(ODataQueryOptions <E> request)
{
try
{
//Validate that the request is correctly formed.
request.Validate(mODataValidate);
//Load the request with the necessary parameters.
SearchRequest rq = new SearchRequest();
rq.ODataPopulate(request);
//Make the request to the persistence service.
RepositorySettings settings = ApiUtility.BuildRepositorySettings(ActionContext);
RepositoryHolder <SearchRequest, SearchResponse> response = await mRespository.Search(rq, settings);
return(new OData4ServiceDocumentResponse(response, ActionContext.Request.RequestUri));
}
catch (Exception vex)
{
return(BadRequest($"Unable to process Odata request - {vex.Message}"));
}
}
/// <summary>
/// This method marshals the RepositoryHolder and transmits it to the remote Microservice.
/// </summary>
/// <typeparam Name="KT">The key type.</typeparam>
/// <typeparam Name="ET">The entity type.</typeparam>
/// <param name="actionType">The action type.</param>
/// <param name="rq">The repository holder request.</param>
/// <param name="routing"></param>
/// <returns>Returns an async task that will be signalled when the request completes or times out.</returns>
protected override async Task <RepositoryHolder <KT, ET> > TransmitInternal <KT, ET>(string actionType, RepositoryHolder <KT, ET> rq, ProcessOptions?routing = null, IPrincipal principal = null)
{
StatisticsInternal.ActiveIncrement();
var payloadRq = TransmissionPayload.Create(mPolicy.TransmissionPayloadTraceEnabled);
// Set the originator key to the correlation id if passed through the rq settings
if (!string.IsNullOrEmpty(rq.Settings?.CorrelationId))
{
payloadRq.Message.ProcessCorrelationKey = rq.Settings.CorrelationId;
}
bool processAsync = rq.Settings?.ProcessAsync ?? false;
payloadRq.Options = ProcessOptions.RouteInternal;
var message = payloadRq.Message;
payloadRq.MaxProcessingTime = rq.Settings?.WaitTime ?? mDefaultRequestTimespan;
payloadRq.MessageObject = rq;
message.ChannelId = ChannelId;
message.ChannelPriority = processAsync ? 0:-1;
message.MessageType = mMessageType;
message.ActionType = actionType;
message.ResponseChannelId = mResponseChannel;
message.ResponseChannelPriority = -1; //Always internal
message.Blob = PayloadSerializer.PayloadSerialize(rq);
return(await OutgoingRequestOut(payloadRq, ProcessResponse <KT, ET>, processAsync : processAsync));
}
/// <summary>
/// This abstract method is used to transmit the request to the appropriate party.
/// </summary>
/// <typeparam name="KT">The key type.</typeparam>
/// <typeparam name="ET">The entity type.</typeparam>
/// <param name="actionType">The request action type, i.e. Create/Read etc.</param>
/// <param name="rq">The request.</param>
/// <param name="routing">The routing options.</param>
/// <returns>Returns the request response.</returns>
protected abstract Task <RepositoryHolder <KT, ET> > TransmitInternal <KT, ET>(string actionType, RepositoryHolder <KT, ET> rq, ProcessOptions?routing = null, IPrincipal principal = null)
where KT : IEquatable <KT>;
/// <summary>
/// This method marshals the RepositoryHolder and transmits it to the remote Microservice.
/// </summary>
/// <typeparam Name="KT">The key type.</typeparam>
/// <typeparam Name="ET">The entity type.</typeparam>
/// <param Name="actionType">The action type.</param>
/// <param Name="rq">The repository holder request.</param>
/// <returns>Returns an async task that will be signalled when the request completes or times out.</returns>
protected override async Task <RepositoryHolder <KT, ET> > TransmitInternal <KT, ET>(string actionType, RepositoryHolder <KT, ET> rq, ProcessOptions?routing = null)
{
try
{
StatisticsInternal.ActiveIncrement();
var payload = TransmissionPayload.Create();
// Set the originator key to the correlation id if passed through the rq settings
if (rq.Settings != null && !string.IsNullOrEmpty(rq.Settings.CorrelationId))
{
payload.Message.OriginatorKey = rq.Settings.CorrelationId;
}
bool processAsync = rq.Settings == null ? false : rq.Settings.ProcessAsync;
payload.Message.ChannelPriority = processAsync ? 0 : 1;
payload.Options = routing ?? RoutingDefault ?? ProcessOptions.RouteExternal;
payload.Message.Blob = PayloadSerializer.PayloadSerialize(rq);
payload.Message.ResponseChannelId = ResponseChannelId;
payload.Message.ResponseChannelPriority = payload.Message.ChannelPriority;
payload.Message.ChannelId = ChannelId;
payload.Message.MessageType = EntityType;
payload.Message.ActionType = actionType;
payload.MaxProcessingTime = rq.Settings?.WaitTime ?? mDefaultRequestTimespan;
return(await TransmitAsync(payload, ProcessResponse <KT, ET>, processAsync));
}
catch (Exception ex)
{
string key = rq != null && rq.Key != null?rq.Key.ToString() : string.Empty;
Logger.LogException(string.Format("Error transmitting {0}-{1} internally", actionType, key), ex);
throw;
}
}
/// <summary>
/// This method resolves the appropriate transport serialzer from the incoming accept header.
/// </summary>
/// <param name="rs">The response</param>
/// <param name="data">The response content</param>
/// <param name="holder">The repository holder</param>
/// <returns>Returns true if the serializer can be resolved.</returns>
protected virtual void EntityDeserialize(HttpResponseMessage rs, byte[] data, RepositoryHolder <K, E> holder)
{
string mediaType = rs.Content.Headers.ContentType.MediaType;
if (mTransportSerializers.ContainsKey(mediaType))
{
var transport = mTransportSerializers[mediaType];
holder.Entity = transport.GetObject(data);
}
else
{
throw new TransportSerializerResolutionException(mediaType);
}
}
/// <summary>
/// This method calls the client using HTTP and returns the response along with the entity in the response if supplied.
/// </summary>
/// <typeparam name="KT">The key type.</typeparam>
/// <typeparam name="ET">The entity type.</typeparam>
/// <param name="uri">The request uri.</param>
/// <param name="options">The repository settings passed from the caller.</param>
/// <param name="content">The HttpContent to send to the API.</param>
/// <param name="adjust">Any message adjustment.</param>
/// <param name="mapper">Any response adjustment before returning to the caller.</param>
/// <param name="deserializer">Deserialize the response content into the entity</param>
/// <returns></returns>
protected virtual async Task <RepositoryHolder <KT, ET> > CallClient <KT, ET>(
KeyValuePair <HttpMethod, Uri> uri
, RepositorySettings options
, HttpContent content = null
, Action <HttpRequestMessage> adjust = null
, Action <HttpResponseMessage, RepositoryHolder <KT, ET> > mapper = null
, Action <HttpResponseMessage, byte[], RepositoryHolder <KT, ET> > deserializer = null)
{
var response = new RepositoryHolder <KT, ET>();
try
{
HttpRequestMessage httpRq = Request(uri.Key, uri.Value);
RequestHeadersSet(httpRq);
RequestHeadersSetTransport(httpRq);
RequestHeadersPreferSet(httpRq, options?.Prefer);
RequestHeadersAuth(httpRq);
adjust?.Invoke(httpRq);
if (content != null)
{
httpRq.Content = content;
}
var client = new HttpClient();
// Specify request body
var httpRs = await client.SendAsync(httpRq);
ResponseHeadersAuth(httpRq, httpRs);
//OK, set the response content if set
if (httpRs.Content != null && httpRs.Content.Headers.ContentLength > 0)
{
byte[] httpRsContent = await httpRs.Content.ReadAsByteArrayAsync();
if (httpRs.IsSuccessStatusCode)
{
deserializer?.Invoke(httpRs, httpRsContent, response);
}
else
{
// So that we can see error messages such as schema validation fail
response.ResponseMessage = Encoding.UTF8.GetString(httpRsContent);
}
}
//Get any outgoing trace headers and set them in to the response.
IEnumerable <string> trace;
if (httpRs.Headers.TryGetValues(ApimConstants.AzureTraceHeaderLocation, out trace))
{
response.Settings.Prefer.Add(ApimConstants.AzureTraceHeaderLocation, trace.First());
}
response.ResponseCode = (int)httpRs.StatusCode;
mapper?.Invoke(httpRs, response);
}
catch (Exception ex)
{
response.ResponseMessage = FormatExceptionChain(ex);
response.ResponseCode = 503;
}
return(response);
}
/// <summary>
/// This method registers the specific persistence handler.
/// </summary>
/// <typeparam Name="KT">The key type.</typeparam>
/// <typeparam Name="ET">The entity type.</typeparam>
/// <param name="actionType">The action type identifier</param>
/// <param name="action">The action to process the command.</param>
/// <param name="logEventOnSuccess"></param>
/// <param name="preaction"></param>
/// <param name="postaction"></param>
/// <param name="timeoutcorrect"></param>
/// <param name="retryOnTimeout"></param>
/// <param name="channelId"></param>
/// <param name="entityType"></param>
protected virtual void PersistenceCommandRegister <KT, ET>(string actionType
, Func <PersistenceRequestHolder <KT, ET>, Task> action
, bool logEventOnSuccess = false
, Func <PersistenceRequestHolder <KT, ET>, Task <bool> > preaction = null
, Func <PersistenceRequestHolder <KT, ET>, Task> postaction = null
, Func <PersistenceRequestHolder <KT, ET>, Task <bool> > timeoutcorrect = null
, int?retryOnTimeout = null
, string channelId = null
, string entityType = null
)
{
Func <TransmissionPayload, List <TransmissionPayload>, Task> actionPayload = async(incoming, outgoing) =>
{
var profileHolder = ProfileStart <KT, ET>(incoming, outgoing);
try
{
var rsMessage = incoming.Message.ToResponse();
rsMessage.ChannelId = incoming.Message.ResponseChannelId;
rsMessage.ChannelPriority = incoming.Message.ResponseChannelPriority;
rsMessage.MessageType = incoming.Message.MessageType;
rsMessage.ActionType = "";
var rsPayload = new TransmissionPayload(rsMessage);
bool hasTimedOut = false;
try
{
RepositoryHolder <KT, ET> rqTemp = incoming.MessageObject as RepositoryHolder <KT, ET>;
//Deserialize the incoming payloadRq request
if (rqTemp == null)
{
rqTemp = PayloadSerializer.PayloadDeserialize <RepositoryHolder <KT, ET> >(incoming);
}
profileHolder.Rq = new PersistenceRepositoryHolder <KT, ET>(rqTemp);
if (profileHolder.Rq.Timeout == null)
{
profileHolder.Rq.Timeout = TimeSpan.FromSeconds(10);
}
bool preactionFailed = false;
try
{
bool retryExceeded = false;
do
{
int attempt = Environment.TickCount;
//Create the payloadRs holder, and discard any previous version.
profileHolder.Rs = new PersistenceRepositoryHolder <KT, ET>();
if (preaction != null && !(await preaction(profileHolder)))
{
preactionFailed = true;
break;
}
//Call the specific command to process the action, i.e Create, Read, Update, Delete ... etc.
await action(profileHolder);
//Flag if the request times out at any point.
//This may be required later when checking whether the action was actually successful.
hasTimedOut |= profileHolder.Rs.IsTimeout;
//OK, if this is not a time out then it is successful
if (!profileHolder.Rs.IsTimeout && !profileHolder.Rs.ShouldRetry)
{
break;
}
ProfileRetry(profileHolder, attempt);
if (profileHolder.Rs.IsTimeout)
{
Logger.LogMessage(LoggingLevel.Warning, $"Timeout occured for {EntityType} {actionType} for request:{profileHolder.Rq} with response:{profileHolder.Rs}", "DBTimeout");
}
profileHolder.Rq.IsRetry = true;
//These should not be counted against the limit.
if (!profileHolder.Rs.ShouldRetry)
{
profileHolder.Rq.Retry++;
}
profileHolder.Rq.IsTimeout = false;
retryExceeded = incoming.Cancel.IsCancellationRequested ||
profileHolder.Rq.Retry > mPolicy.PersistenceRetryPolicy.GetMaximumRetries(incoming);
}while (!retryExceeded);
//Signal to the underlying comms channel that the message has been processed successfully.
incoming.Signal(!retryExceeded);
// If we have exceeded the retry limit then Log error
if (retryExceeded)
{
Log(actionType
, profileHolder
, LoggingLevel.Error
, $"Retry limit has been exceeded (cancelled ({incoming.Cancel.IsCancellationRequested})) for {EntityType} {actionType} for {profileHolder.Rq} after {incoming.Message?.FabricDeliveryCount} delivery attempts"
, "DBRetry");
profileHolder.result = ResourceRequestResult.RetryExceeded;
}
}
catch (Exception ex)
{
LogException(actionType, profileHolder, ex);
incoming.SignalFail();
profileHolder.result = ResourceRequestResult.Exception;
}
bool logEventSource = !preactionFailed && logEventOnSuccess && profileHolder.Rs.IsSuccess;
if (!profileHolder.Rs.IsSuccess && hasTimedOut && timeoutcorrect != null && profileHolder.result != ResourceRequestResult.Exception)
{
if (await timeoutcorrect(profileHolder))
{
logEventSource = true;
Logger.LogMessage(LoggingLevel.Info
, string.Format("Recovered timeout sucessfully for {0}-{1} for request:{2} - response:{3}", EntityType, actionType, profileHolder.Rq, profileHolder.Rs)
, "DBTimeout");
}
else
{
Logger.LogMessage(LoggingLevel.Error
, string.Format("Not recovered timeout for {0}-{1} for request:{2} - response:{3}", EntityType, actionType, profileHolder.Rq, profileHolder.Rs)
, "DBTimeout");
}
}
if (logEventSource && profileHolder.Rs.ShouldLogEventSource)
{
await LogEventSource(actionType, profileHolder);
}
if (!preactionFailed && postaction != null)
{
await postaction(profileHolder);
}
//Serialize the payloadRs
var reposHolder = profileHolder.Rs.ToRepositoryHolder();
rsPayload.MessageObject = reposHolder;
rsPayload.Message.Blob = PayloadSerializer.PayloadSerialize(reposHolder);
rsPayload.Message.Status = "200";
if (!profileHolder.result.HasValue)
{
profileHolder.result = ResourceRequestResult.Success;
}
}
catch (Exception ex)
{
incoming.SignalFail();
rsPayload.Message.Status = "500";
rsPayload.Message.StatusDescription = ex.Message;
Logger.LogException($"Error processing message (was cancelled({incoming.Cancel.IsCancellationRequested}))-{EntityType}-{actionType}-{profileHolder.Rq}", ex);
profileHolder.result = ResourceRequestResult.Exception;
}
// check whether we need to send a response message. If this is async and AsyncResponse is not set to true,
// then by default we do not send a response message to cut down on unnecessary traffic.
if (profileHolder.Rq == null || profileHolder.Rq.Settings == null || !profileHolder.Rq.Settings.ProcessAsync)
{
outgoing.Add(rsPayload);
}
}
finally
{
ProfileEnd(profileHolder);
}
};
if (channelId == null)
{
channelId = ChannelId ?? string.Empty;
}
if (entityType == null)
{
entityType = EntityType;
}
CommandRegister(
channelId.ToLowerInvariant()
, entityType.ToLowerInvariant()
, actionType.ToLowerInvariant()
, actionPayload);
}
/// <summary>
/// This method marshals the RepositoryHolder and transmits it to the remote Microservice.
/// </summary>
/// <typeparam Name="KT">The key type.</typeparam>
/// <typeparam Name="ET">The entity type.</typeparam>
/// <param name="actionType">The action type.</param>
/// <param name="rq">The repository holder request.</param>
/// <param name="routing"></param>
/// <returns>Returns an async task that will be signalled when the request completes or times out.</returns>
protected override async Task <RepositoryHolder <KT, ET> > TransmitInternal <KT, ET>(string actionType, RepositoryHolder <KT, ET> rq, ProcessOptions?routing = null)
{
StatisticsInternal.ActiveIncrement();
var payloadRq = TransmissionPayload.Create();
bool processAsync = rq.Settings?.ProcessAsync ?? false;
payloadRq.Options = ProcessOptions.RouteInternal;
var message = payloadRq.Message;
payloadRq.MaxProcessingTime = rq.Settings?.WaitTime ?? mDefaultRequestTimespan;
payloadRq.MessageObject = rq;
message.ChannelId = ChannelId;
message.ChannelPriority = processAsync ? 0:-1;
message.MessageType = mMessageType;
message.ActionType = actionType;
message.ResponseChannelId = mResponseChannel;
message.ResponseChannelPriority = -1; //Always internal
message.Blob = PayloadSerializer.PayloadSerialize(rq);
return(await TransmitAsync(payloadRq, ProcessResponse <KT, ET>, processAsync : processAsync));
}
public PersistenceRepositoryHolder(RepositoryHolder <object, object> rqTemp)
{
this.rqTemp = rqTemp;
}
/// <summary>
/// This method processes the outgoing response.
/// </summary>
/// <typeparam name="KT">The key type.</typeparam>
/// <typeparam name="ET">The entity type.</typeparam>
/// <param name="responseHolder">The response message.</param>
/// <param name="entitySerializer">The optional serializer.</param>
/// <returns>Returns the relevant result.</returns>
protected virtual IHttpActionResult ResponseFormat <KT, ET>(RepositoryHolder <KT, ET> responseHolder
, TransportSerializer <ET> entitySerializer = null)
{
ApiResponse response = null;
switch (responseHolder.ResponseCode)
{
case 200:
response = new ApiResponse(HttpStatusCode.OK);
break;
case 201:
response = new ApiResponse(HttpStatusCode.Created);
break;
case 202:
response = new ApiResponse(HttpStatusCode.Accepted);
break;
case 204:
response = new ApiResponse(HttpStatusCode.NoContent);
break;
case 400:
return(BadRequest(responseHolder.ResponseMessage ?? string.Empty));
case 404:
return(StatusCode(HttpStatusCode.NotFound));
case 405:
return(StatusCode(HttpStatusCode.MethodNotAllowed));
case 408:
return(StatusCode(HttpStatusCode.RequestTimeout));
case 409:
return(StatusCode(HttpStatusCode.Conflict));
case 412:
return(StatusCode(HttpStatusCode.PreconditionFailed));
case 417:
return(StatusCode(HttpStatusCode.ExpectationFailed));
case 442:
return(StatusCode(HttpStatusCode.UnsupportedMediaType));
case 502:
return(StatusCode(HttpStatusCode.BadGateway));
case 504:
return(StatusCode(HttpStatusCode.GatewayTimeout));
default:
LogMessage(LoggingLevel.Error, $"Unexpected error occurred {responseHolder}");
return(StatusCode(HttpStatusCode.InternalServerError));
}
if (entitySerializer != null && responseHolder.Entity != null)
{
response.MediaType = entitySerializer.MediaType;
response.Data = entitySerializer.GetData(responseHolder.Entity);
}
if (responseHolder.KeyReference != null)
{
response.ContentId = responseHolder.KeyReference.Item1;
response.VersionId = responseHolder.KeyReference.Item2;
}
if (responseHolder.IsCached)
{
response.IsCached = true;
}
return(response);
}
public OData4ServiceDocumentResponse(RepositoryHolder <SearchRequest, SearchResponse> response, Uri requestUri)
{
mRequest = requestUri;
mResponse = response;
}
/// <summary>
/// This method calls the client using HTTP and returns the response along with the entity in the response if supplied.
/// </summary>
/// <typeparam name="KT">The key type.</typeparam>
/// <typeparam name="ET">The entity type.</typeparam>
/// <param name="uri">The request uri.</param>
/// <param name="options">The repository settings passed from the caller.</param>
/// <param name="content">The HttpContent to send to the API.</param>
/// <param name="adjust">Any message adjustment.</param>
/// <param name="mapper">Any response adjustment before returning to the caller.</param>
/// <param name="deserializer">Deserialize the response content into the entity</param>
/// <returns></returns>
protected virtual async Task <RepositoryHolder <KT, ET> > CallClient <KT, ET>(
KeyValuePair <HttpMethod, Uri> uri
, RepositorySettings options
, HttpContent content = null
, Action <HttpRequestMessage> adjust = null
, Action <HttpResponseMessage, RepositoryHolder <KT, ET> > mapper = null
, Action <HttpResponseMessage, byte[], RepositoryHolder <KT, ET> > deserializer = null)
{
var rs = new RepositoryHolder <KT, ET>();
try
{
HttpRequestMessage rq = Request(uri.Key, uri.Value);
adjust?.Invoke(rq);
if (content != null)
{
rq.Content = content;
}
if (options?.Prefer != null && options.Prefer.Count > 0)
{
rq.Headers.Add("Prefer", options.Prefer.Select((k) => string.Format("{0}={1}", k.Key, k.Value)));
}
var client = new HttpClient();
// Specify request body
var response = await client.SendAsync(rq);
if (response.Content != null && response.Content.Headers.ContentLength > 0)
{
byte[] rsContent = await response.Content.ReadAsByteArrayAsync();
if (response.IsSuccessStatusCode)
{
deserializer?.Invoke(response, rsContent, rs);
}
else
{
// So that we can see error messages such as schema validation fail
rs.ResponseMessage = Encoding.UTF8.GetString(rsContent);
}
}
//Get any outgoing trace headers and set them in to the response.
IEnumerable <string> trace;
if (response.Headers.TryGetValues(ApimConstants.AzureTraceHeaderLocation, out trace))
{
rs.Settings.Prefer.Add(ApimConstants.AzureTraceHeaderLocation, trace.First());
}
rs.ResponseCode = (int)response.StatusCode;
mapper?.Invoke(response, rs);
}
catch (Exception ex)
{
rs.ResponseMessage = FormatExceptionChain(ex);
rs.ResponseCode = 503;
}
return(rs);
}