/
request.go
247 lines (220 loc) · 5.32 KB
/
request.go
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package ext
import (
"bytes"
"encoding/json"
"fmt"
"io"
"mime/multipart"
"net/http"
"net/url"
"time"
"github.com/pkg/errors"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
const ApiUrl = "https://api.telegram.org/bot"
var DefaultTgBotRequester = BaseRequester{
Client: http.Client{
Timeout: time.Millisecond * 1500,
},
ApiUrl: ApiUrl,
}
type response struct {
Ok bool
Result json.RawMessage
ErrorCode int `json:"error_code"`
Description string
Parameters json.RawMessage
}
type BaseRequester struct {
Client http.Client
ApiUrl string
}
type TelegramError struct {
Method string
Values url.Values
Code int
Description string
}
func (t *TelegramError) Error() string {
return fmt.Sprintf("unable to %s: %s", t.Method, t.Description)
}
type Requester interface {
Get(l *zap.SugaredLogger, token string, method string, params url.Values) (json.RawMessage, error)
Post(l *zap.SugaredLogger, token string, method string, params url.Values, data map[string]PostFile) (json.RawMessage, error)
}
func (tbg BaseRequester) Get(l *zap.SugaredLogger, token string, method string, params url.Values) (json.RawMessage, error) {
endpoint := tbg.ApiUrl
if endpoint == "" {
endpoint = ApiUrl
}
req, err := http.NewRequest("GET", endpoint+token+"/"+method, nil)
if err != nil {
return nil, errors.Wrapf(err, "unable to build GET request to %v", method)
}
req.URL.RawQuery = params.Encode()
l.Debugf("executing GET: %+v", req)
resp, err := tbg.Client.Do(req)
if err != nil {
l.Debugw("failed to execute GET request",
zapcore.Field{
Key: "method",
Type: zapcore.StringType,
String: method,
},
zap.Error(err))
return nil, errors.Wrapf(err, "client error executing GET request to %v", method)
}
defer resp.Body.Close()
l.Debugf("successful GET request: %+v", resp)
var r response
if err = json.NewDecoder(resp.Body).Decode(&r); err != nil {
l.Debugw("failed to deserialize GET response body",
zapcore.Field{
Key: "method",
Type: zapcore.StringType,
String: method,
},
zap.Error(err))
return nil, errors.Wrapf(err, "decoding error while reading GET request to %v", method)
}
if !r.Ok {
l.Debugw("error from GET",
zapcore.Field{
Key: "method",
Type: zapcore.StringType,
String: method,
},
zapcore.Field{
Key: "error_code",
Type: zapcore.Int64Type,
Integer: int64(r.ErrorCode),
},
zapcore.Field{
Key: "description",
Type: zapcore.StringType,
String: r.Description,
},
)
return nil, &TelegramError{
Method: method,
Values: params,
Code: r.ErrorCode,
Description: r.Description,
}
}
l.Debugw("obtained GET result",
zapcore.Field{
Key: "method",
Type: zapcore.StringType,
String: method,
},
zapcore.Field{
Key: "result",
Type: zapcore.StringType,
String: string(r.Result),
},
)
return r.Result, nil
}
type PostFile struct {
File io.Reader
FileName string
}
func (tbg BaseRequester) Post(l *zap.SugaredLogger, token string, method string, params url.Values, data map[string]PostFile) (json.RawMessage, error) {
endpoint := tbg.ApiUrl
if endpoint == "" {
endpoint = ApiUrl
}
b := bytes.Buffer{}
w := multipart.NewWriter(&b)
defer w.Close()
for field, x := range data {
fileName := x.FileName
if fileName == "" {
fileName = "unnamed_file"
}
part, err := w.CreateFormFile(field, fileName)
if err != nil {
return nil, err
}
_, err = io.Copy(part, x.File)
if err != nil {
return nil, err
}
}
err := w.Close()
if err != nil {
return nil, err
}
req, err := http.NewRequest("POST", endpoint+token+"/"+method, &b)
if err != nil {
l.Debugw("failed to execute POST request",
zapcore.Field{
Key: "method",
Type: zapcore.StringType,
String: method,
},
zap.Error(err))
return nil, errors.Wrapf(err, "client error executing POST request to %v", method)
}
req.URL.RawQuery = params.Encode()
req.Header.Set("Content-Type", w.FormDataContentType())
l.Debugf("POST request with body: %+v", b)
l.Debugf("executing POST: %+v", req)
resp, err := tbg.Client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
l.Debugf("successful POST request: %+v", resp)
var r response
if err = json.NewDecoder(resp.Body).Decode(&r); err != nil {
l.Debugw("failed to deserialize POST response body",
zapcore.Field{
Key: "method",
Type: zapcore.StringType,
String: method,
},
zap.Error(err))
return nil, errors.Wrapf(err, "decoding error while reading POST request to %v", method)
}
if !r.Ok {
l.Debugw("error from POST",
zapcore.Field{
Key: "method",
Type: zapcore.StringType,
String: method,
},
zapcore.Field{
Key: "error_code",
Type: zapcore.Int64Type,
Integer: int64(r.ErrorCode),
},
zapcore.Field{
Key: "description",
Type: zapcore.StringType,
String: r.Description,
},
)
return nil, &TelegramError{
Method: method,
Values: params,
Code: r.ErrorCode,
Description: r.Description,
}
}
l.Debugw("obtained POST result",
zapcore.Field{
Key: "method",
Type: zapcore.StringType,
String: method,
},
zapcore.Field{
Key: "result",
Type: zapcore.StringType,
String: string(r.Result),
},
)
return r.Result, nil
}