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request.go
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request.go
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package native
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net/http"
"time"
)
// MaxIdleConnections is the maximum number of idle web client
// connections to maintain.
var MaxIdleConnections = 20
// RequestTimeout describes the maximum amount of time to wait
// for a response to any request.
var RequestTimeout = 2 * time.Second
// RequestError describes an error with an error Code.
type RequestError interface {
error
Code() int
}
type requestError struct {
statusCode int
text string
}
// Error returns the request error as a string.
func (e *requestError) Error() string {
return e.text
}
// Code returns the status code from the request.
func (e *requestError) Code() int {
return e.statusCode
}
// CodeFromError extracts and returns the code from an error, or
// 0 if not found.
func CodeFromError(err error) int {
if reqerr, ok := err.(RequestError); ok {
return reqerr.Code()
}
return 0
}
func maybeRequestError(resp *http.Response) RequestError {
if resp.StatusCode >= 200 && resp.StatusCode < 300 {
// 2xx response: All good.
return nil
}
return &requestError{
text: "Non-2XX response: " + resp.Status,
statusCode: resp.StatusCode,
}
}
// MissingParams is an error message response emitted when a request
// does not contain required parameters
type MissingParams struct {
//Message
Type string `json:"type"`
Params []string `json:"params"` // List of missing parameters which are required
}
// Get calls the ARI server with a GET request
func Get(conn *Conn, url string, ret interface{}) error {
finalURL := conn.Options.URL + url
httpReq, err := buildRequest(conn, "GET", finalURL, "", nil)
if err != nil {
return err
}
resp, err := conn.httpClient.Do(httpReq)
if err != nil {
return fmt.Errorf("Error making request: %s", err)
}
defer resp.Body.Close()
if ret != nil {
if err := json.NewDecoder(resp.Body).Decode(ret); err != nil {
return err
}
}
return maybeRequestError(resp)
}
// Post calls the ARI server with a POST request.
func Post(conn *Conn, requestURL string, ret interface{}, req interface{}) error {
finalURL := conn.Options.URL + requestURL
requestBody, contentType, err := structToRequestBody(req)
if err != nil {
return err
}
httpReq, err := buildRequest(conn, "POST", finalURL, contentType, requestBody)
if err != nil {
return err
}
resp, err := conn.httpClient.Do(httpReq)
if err != nil {
return fmt.Errorf("Error making request: %s", err)
}
defer resp.Body.Close()
if ret != nil {
if err := json.NewDecoder(resp.Body).Decode(ret); err != nil {
return err
}
}
return maybeRequestError(resp)
}
// Put calls the ARI server with a PUT request.
func Put(conn *Conn, url string, ret interface{}, req interface{}) error {
finalURL := conn.Options.URL + url
requestBody, contentType, err := structToRequestBody(req)
if err != nil {
return err
}
httpReq, err := buildRequest(conn, "PUT", finalURL, contentType, requestBody)
if err != nil {
return err
}
resp, err := conn.httpClient.Do(httpReq)
if err != nil {
return fmt.Errorf("Error making request: %s", err)
}
defer resp.Body.Close()
if ret != nil {
if err := json.NewDecoder(resp.Body).Decode(ret); err != nil {
return err
}
}
return maybeRequestError(resp)
}
// Delete calls the ARI server with a DELETE request
func Delete(conn *Conn, url string, ret interface{}, req string) error {
finalURL := conn.Options.URL + url
if req != "" {
finalURL = finalURL + "?" + req
}
httpReq, err := buildRequest(conn, "DELETE", finalURL, "", nil)
if err != nil {
return err
}
resp, err := conn.httpClient.Do(httpReq)
if err != nil {
return fmt.Errorf("Error making request: %s", err)
}
defer resp.Body.Close()
if ret != nil {
if err := json.NewDecoder(resp.Body).Decode(ret); err != nil {
return err
}
}
return maybeRequestError(resp)
}
func buildRequest(conn *Conn, method string, finalURL string, contentType string, body io.Reader) (*http.Request, error) {
if contentType == "" {
contentType = "application/json"
}
ret, err := http.NewRequest(method, finalURL, body)
if err != nil {
return nil, err
}
if conn.Options.Username != "" {
ret.SetBasicAuth(conn.Options.Username, conn.Options.Password)
}
ret.Header.Set("Content-Type", contentType)
return ret, nil
}
func structToRequestBody(req interface{}) (io.Reader, string, error) {
buf := bytes.NewBuffer([]byte(""))
if req != nil {
if err := json.NewEncoder(buf).Encode(req); err != nil {
return nil, "", err
}
}
return buf, "application/json", nil
}