Function executeCommand

remote.go:130–210

(method, url string, data []byte)

}

func executeCommand(method, url string, data []byte) (json.RawMessage, error) {
	debugLog("-> %s %s\n%s", method, filteredURL(url), data)
	request, err := newRequest(method, url, data)
	if err != nil {
		return nil, err
	}

	response, err := HTTPClient.Do(request)
	if err != nil {
		return nil, err
	}

	buf, err := ioutil.ReadAll(response.Body)
	if debugFlag {
		if err == nil {
			// Pretty print the JSON response
			var prettyBuf bytes.Buffer
			if err = json.Indent(&prettyBuf, buf, "", "    "); err == nil && prettyBuf.Len() > 0 {
				buf = prettyBuf.Bytes()
			}
		}
		debugLog("<- %s [%s]\n%s", response.Status, response.Header["Content-Type"], buf)
	}
	if err != nil {
		return nil, errors.New(response.Status)
	}

	fullCType := response.Header.Get("Content-Type")
	cType, _, err := mime.ParseMediaType(fullCType)
	if err != nil {
		return nil, fmt.Errorf("got content type header %q, expected %q", fullCType, jsonContentType)
	}
	if cType != jsonContentType {
		return nil, fmt.Errorf("got content type %q, expected %q", cType, jsonContentType)
	}

	reply := new(serverReply)
	if err := json.Unmarshal(buf, reply); err != nil {
		if response.StatusCode != http.StatusOK {
			return nil, fmt.Errorf("bad server reply status: %s", response.Status)
		}
		return nil, err
	}
	if reply.Err != "" {
		return nil, &reply.Error
	}

	// Handle the W3C-compliant error format. In the W3C spec, the error is
	// embedded in the 'value' field.
	if len(reply.Value) > 0 {
		respErr := new(Error)
		if err := json.Unmarshal(reply.Value, respErr); err == nil && respErr.Err != "" {
			respErr.HTTPCode = response.StatusCode
			return nil, respErr
		}
	}

	// Handle the legacy error format.