protected override async Task <TResult> InterceptAsyncCore <TResult>(IInvocation invocation, Func <IInvocation, Task <TResult> > proceed)
{
if (!IsServiceMethodInvocation(invocation))
{
return(await proceed(invocation));
}
string accessToken = await m_TokenService.GetTokenAsync();
var channel = m_GetClientChannel();
using (var scope = new FlowingOperationContextScope(channel))
{
var httpRequestProperty = new HttpRequestMessageProperty();
httpRequestProperty.Headers[HttpRequestHeader.Authorization] =
$"Bearer {accessToken}";
OperationContext.Current.OutgoingMessageProperties[HttpRequestMessageProperty.Name] =
httpRequestProperty;
try
{
// Try invoke service method
return(await proceed(invocation).ContinueOnScope(scope));
}
catch (AggregateException ex)
{
if (Helpers.CouldBeExpiredTokenException(ex.InnerException))
{
// Try to refresh token
string newToken = await m_TokenService.GetTokenAsync().ContinueOnScope(scope);
if (newToken == accessToken)
{
// Unauthorized not because of token being expired but for other reasons
throw;
}
httpRequestProperty.Headers[HttpRequestHeader.Authorization] =
$"Bearer {newToken}";
return(await proceed(invocation).ContinueOnScope(scope));
}
throw;
}
}
}
/// <summary>
/// Async service method call
/// </summary>
public static async Task <TResult> WrapServiceMethodCallAsync <TResult>(
Func <Task <TResult> > invokeServiceMethod, IClientChannel clientChannel, ITokenService tokenService)
{
string accessToken = await tokenService.GetTokenAsync();
// Using OperationContextScope in "async Dispose" scenario
// will cause System.InvalidOperationException :
// This OperationContextScope is being disposed on a different thread than it was created.
// See https://stackoverflow.com/a/22753055 how to get away with it.
using (var scope = new FlowingOperationContextScope(clientChannel))
{
var httpRequestProperty = new HttpRequestMessageProperty();
httpRequestProperty.Headers[System.Net.HttpRequestHeader.Authorization] =
$"Bearer {accessToken}";
OperationContext.Current.OutgoingMessageProperties[HttpRequestMessageProperty.Name] =
httpRequestProperty;
try
{
return(await invokeServiceMethod().ContinueOnScope(scope));
}
catch (AggregateException ex)
{
if (Helpers.CouldBeExpiredTokenException(ex.InnerException))
{
// Try to refresh token
string newToken = await tokenService.GetTokenAsync().ContinueOnScope(scope);
if (newToken != accessToken)
{
httpRequestProperty.Headers[System.Net.HttpRequestHeader.Authorization] =
$"Bearer {newToken}";
return(await invokeServiceMethod().ContinueOnScope(scope));
}
}
throw;
}
}
}
public static SimpleAwaiter <TResult> ContinueOnScope <TResult>(this Task <TResult> @this, FlowingOperationContextScope scope)
{
return(new SimpleAwaiter <TResult>(@this, scope.BeforeAwait, scope.AfterAwait));
}