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client.go
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client.go
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package http_client
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
)
const (
userAgent = "http-client"
)
type ErrorResponse struct {
Response *http.Response
Message string
RequestID string
}
type Client struct {
client *http.Client
BaseURL *url.URL
UserAgent string
Authorization string
}
type ClientOpt func(*Client) error
func NewClient(httpClient *http.Client) *Client {
if httpClient == nil {
httpClient = &http.Client{}
}
if httpClient.Transport == nil {
httpClient.Transport = &interTransport{transport: http.DefaultTransport}
} else {
httpClient.Transport = &interTransport{transport: httpClient.Transport}
}
return &Client{client: httpClient, UserAgent: userAgent}
}
func New(httpClient *http.Client, opts ...ClientOpt) (*Client, error) {
c := NewClient(httpClient)
for _, opt := range opts {
if err := opt(c); err != nil {
return nil, err
}
}
return c, nil
}
func SetBaseURL(bu string) ClientOpt {
return func(c *Client) error {
u, err := url.Parse(bu)
if err != nil {
return err
}
c.BaseURL = u
return nil
}
}
func SetUserAgent(ua string) ClientOpt {
return func(c *Client) error {
c.UserAgent = ua
return nil
}
}
func SetAuthorization(token, tokenType string) ClientOpt {
return func(c *Client) error {
c.Authorization = fmt.Sprintf("%s %s", tokenType, token)
return nil
}
}
func SetInterceptor(inter Interceptor) ClientOpt {
return func(c *Client) error {
tr, ok := c.client.Transport.(*interTransport)
if !ok {
return fmt.Errorf("error")
}
tr.AddInterceptor(inter)
return nil
}
}
func (c *Client) AddInterceptor(inter Interceptor) error {
tr, ok := c.client.Transport.(*interTransport)
if !ok {
return fmt.Errorf("error")
}
tr.AddInterceptor(inter)
return nil
}
func (c *Client) parseURL(urlStr string) (*url.URL, error) {
if c.BaseURL == nil {
return url.ParseRequestURI(urlStr)
}
return c.BaseURL.Parse(urlStr)
}
func (c *Client) NewRequest(method, urlStr string, body interface{}) (*http.Request, error) {
u, err := c.parseURL(urlStr)
if err != nil {
return nil, err
}
var buf io.ReadWriter
if body != nil {
buf = &bytes.Buffer{}
err = json.NewEncoder(buf).Encode(body)
if err != nil {
return nil, err
}
}
req, err := http.NewRequest(method, u.String(), buf)
if err != nil {
return nil, err
}
if body != nil {
req.Header.Set("Content-Type", "application/json")
}
if c.UserAgent != "" {
req.Header.Set("User-Agent", c.UserAgent)
}
if c.Authorization != "" {
req.Header.Set("Authorization", c.Authorization)
}
return req, nil
}
func (c *Client) Do(ctx context.Context, req *http.Request, v interface{}) (*http.Response, error) {
resp, err := DoRequestWithClient(ctx, c.client, req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if err = CheckResponse(resp); err != nil {
return resp, err
}
switch v := v.(type) {
case nil:
case io.Writer:
_, err = io.Copy(v, resp.Body)
default:
decErr := json.NewDecoder(resp.Body).Decode(v)
if decErr == io.EOF {
decErr = nil // ignore EOF errors caused by empty response body
}
if decErr != nil {
err = decErr
}
}
return resp, err
}
func DoRequestWithClient(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
req = req.WithContext(ctx)
return client.Do(req)
}
func CheckResponse(r *http.Response) error {
if c := r.StatusCode; c >= 200 && c <= 299 {
return nil
}
errorResponse := &ErrorResponse{Response: r}
data, err := ioutil.ReadAll(r.Body)
if err == nil && len(data) > 0 {
err := json.Unmarshal(data, errorResponse)
if err != nil {
errorResponse.Message = string(data)
}
}
return errorResponse
}
func (r *ErrorResponse) Error() string {
if r.RequestID != "" {
return fmt.Sprintf("%v %v: %d (request %q) %v",
r.Response.Request.Method, r.Response.Request.URL, r.Response.StatusCode, r.RequestID, r.Message)
}
return fmt.Sprintf("%v %v: %d %v",
r.Response.Request.Method, r.Response.Request.URL, r.Response.StatusCode, r.Message)
}