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http.go
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http.go
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package utils
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"net/url"
"strings"
"time"
)
var (
DefaultHTTPClient = &http.Client{
Timeout: time.Duration(30 * time.Second),
}
)
type Decoder interface {
Decode(dst interface{}, src map[string][]string) error
}
type Encoder interface {
Encode(src interface{}, dst map[string][]string) error
}
type FormAuthorization func(url.Values)
type RequestAuthorization func(*http.Request)
func AuthorizeBasic(user, password string) RequestAuthorization {
return func(req *http.Request) {
req.SetBasicAuth(url.QueryEscape(user), url.QueryEscape(password))
}
}
func FormRequest(endpoint string, request interface{}, encoder Encoder, authFn interface{}) (*http.Request, error) {
form := url.Values{}
if err := encoder.Encode(request, form); err != nil {
return nil, err
}
if fn, ok := authFn.(FormAuthorization); ok {
fn(form)
}
body := strings.NewReader(form.Encode())
req, err := http.NewRequest("POST", endpoint, body)
if err != nil {
return nil, err
}
if fn, ok := authFn.(RequestAuthorization); ok {
fn(req)
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
return req, nil
}
func HttpRequest(client *http.Client, req *http.Request, response interface{}) error {
resp, err := client.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return fmt.Errorf("unable to read response body: %v", err)
}
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("http status not ok: %s %s", resp.Status, body)
}
err = json.Unmarshal(body, response)
if err != nil {
return fmt.Errorf("failed to unmarshal response: %v %s", err, body)
}
return nil
}
func URLEncodeResponse(resp interface{}, encoder Encoder) (string, error) {
values := make(map[string][]string)
err := encoder.Encode(resp, values)
if err != nil {
return "", err
}
v := url.Values(values)
return v.Encode(), nil
}
func StartServer(ctx context.Context, port string) {
server := &http.Server{Addr: port}
go func() {
if err := server.ListenAndServe(); err != http.ErrServerClosed {
log.Fatalf("ListenAndServe(): %v", err)
}
}()
go func() {
<-ctx.Done()
err := server.Shutdown(ctx)
log.Fatalf("Shutdown(): %v", err)
}()
}