public async Task ExecuteRequestAsync(RequestContext context)
{
try {
// validate
if (string.IsNullOrWhiteSpace(context.RawRequest.Query))
{
throw new GraphQLException("Query may not be empty.");
}
Events.OnRequestStarting(context);
var handler = new RequestHandler(this, context);
await handler.ExecuteAsync();
} catch (AbortRequestException) {
return; // error already added to response
} catch (InvalidInputException inpEx) {
context.AddInputError(inpEx);
} catch (Exception ex) {
context.AddError(ex);
} finally {
context.Metrics.Duration = AppTime.GetDuration(context.StartTimestamp);
if (context.Failed)
{
Events.OnRequestError(context);
}
Events.OnRequestCompleted(context);
}
}
public async Task HandleGraphQLHttpRequestAsync(HttpContext httpContext)
{
if (httpContext.Request.Path.Value.EndsWith("/schema"))
{
await HandleSchemaDocRequestAsync(httpContext);
return;
}
var start = AppTime.GetTimestamp();
var gqlHttpReq = await BuildGraphQLHttpRequestAsync(httpContext);
var reqCtx = gqlHttpReq.RequestContext; //internal request context
try {
await Server.ExecuteRequestAsync(gqlHttpReq.RequestContext);
} catch (Exception exc) {
gqlHttpReq.RequestContext.AddError(exc);
}
// success, serialize response
try {
var httpResp = httpContext.Response;
httpResp.ContentType = ContentTypeJson;
var respJson = SerializeResponse(reqCtx.Response);
await httpResp.WriteAsync(respJson, httpContext.RequestAborted);
reqCtx.Metrics.HttpRequestDuration = AppTime.GetDuration(start);
} catch (Exception ex) {
// this ex is at attempt to write response as json; we try to write it as plain text and return something
await WriteExceptionsAsTextAsync(httpContext, new[] { ex });
}
}