Golang WrapWithCode Examples

Example #1

File: call.go Project: robmurtha/mercury

// Request yields a Request formed from this Call
func (c Call) Request() (mercury.Request, error) {
	req := mercury.NewRequest()
	req.SetService(c.Service)
	req.SetEndpoint(c.Endpoint)
	req.SetHeaders(c.Headers)
	if c.Context != nil {
		req.SetContext(c.Context)
	}
	if c.Body != nil {
		req.SetBody(c.Body)
		if err := c.marshaler().MarshalBody(req); err != nil {
			return nil, terrors.WrapWithCode(err, nil, terrors.ErrBadRequest)
		}
	}
	return req, nil
}

Example #2

File: client.go Project: robmurtha/mercury

// performCall executes a single Call, unmarshals the response (if there is a response proto), and pushes the updted
// clientCall down the response channel
func (c *client) performCall(call clientCall, middleware []ClientMiddleware, trans transport.Transport,
	timeout time.Duration, completion chan<- clientCall) {

	req := call.req

	// Ensure we have a request ID before the request middleware is executed
	if id := req.Id(); id == "" {
		_uuid, err := uuid.NewV4()
		if err != nil {
			log.Errorf("[Mercury:Client] Failed to generate request uuid: %v", err)
			call.err = terrors.Wrap(err, nil).(*terrors.Error)
			completion <- call
			return
		}
		req.SetId(_uuid.String())
	}

	// Apply request middleware
	for _, md := range middleware {
		req = md.ProcessClientRequest(req)
	}

	log.Debugf("[Mercury:Client] Sending request to %s/%s…", req.Service(), req.Endpoint())

	rsp_, err := trans.Send(req, timeout)
	if err != nil {
		call.err = terrors.Wrap(err, nil).(*terrors.Error)
	} else if rsp_ != nil {
		rsp := mercury.FromTyphonResponse(rsp_)

		// Servers set header Content-Error: 1 when sending errors. For those requests, unmarshal the error, leaving the
		// call's response nil
		if rsp.IsError() {
			errRsp := rsp.Copy()
			if unmarshalErr := c.unmarshaler(rsp, &tperrors.Error{}).UnmarshalPayload(errRsp); unmarshalErr != nil {
				call.err = terrors.WrapWithCode(unmarshalErr, nil, terrors.ErrBadResponse).(*terrors.Error)
			} else {
				err := errRsp.Body().(*tperrors.Error)
				call.err = terrors.Unmarshal(err)
			}

			// Set the response Body to a nil – but typed – interface to avoid type conversion panics if Body
			// properties are accessed in spite of the error
			// Relevant: http://golang.org/doc/faq#nil_error
			if call.rspProto != nil {
				bodyT := reflect.TypeOf(call.rspProto)
				rsp.SetBody(reflect.New(bodyT.Elem()).Interface())
			}

		} else if call.rspProto != nil {
			rsp.SetBody(call.rspProto)
			if err := c.unmarshaler(rsp, call.rspProto).UnmarshalPayload(rsp); err != nil {
				call.err = terrors.WrapWithCode(err, nil, terrors.ErrBadResponse).(*terrors.Error)
			}
		}

		call.rsp = rsp
	}

	// Apply response/error middleware (in reverse order)
	for i := len(middleware) - 1; i >= 0; i-- {
		mw := middleware[i]
		if call.err != nil {
			mw.ProcessClientError(call.err, call.req)
		} else {
			call.rsp = mw.ProcessClientResponse(call.rsp, call.req)
		}
	}

	completion <- call
}