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ratelimitretry.go
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/
ratelimitretry.go
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package common
import (
"bytes"
"compress/flate"
"compress/gzip"
"fmt"
"io"
"io/ioutil"
"net/http"
"time"
"github.com/tencentcloud/tencentcloud-sdk-go/tencentcloud/common/errors"
tchttp "github.com/tencentcloud/tencentcloud-sdk-go/tencentcloud/common/http"
)
const (
codeLimitExceeded = "RequestLimitExceeded"
tplRateLimitRetry = "[WARN] rate limit exceeded, retrying (%d/%d) in %f seconds: %s"
)
func (c *Client) sendWithRateLimitRetry(req *http.Request, retryable bool) (resp *http.Response, err error) {
// make sure maxRetries is more than 0
maxRetries := maxInt(c.profile.RateLimitExceededMaxRetries, 0)
durationFunc := safeDurationFunc(c.profile.RateLimitExceededRetryDuration)
var shadow []byte
for idx := 0; idx <= maxRetries; idx++ {
resp, err = c.sendWithNetworkFailureRetry(req, retryable)
if err != nil {
return
}
shadow, err = shadowRead(resp)
if err != nil {
return resp, err
}
err = tchttp.ParseErrorFromHTTPResponse(shadow)
// should not sleep on last request
if err, ok := err.(*errors.TencentCloudSDKError); ok && err.Code == codeLimitExceeded && idx < maxRetries {
duration := durationFunc(idx)
if c.debug {
c.logger.Printf(tplRateLimitRetry, idx, maxRetries, duration.Seconds(), err.Error())
}
time.Sleep(duration)
continue
}
return resp, err
}
return resp, err
}
func shadowRead(resp *http.Response) ([]byte, error) {
var reader io.ReadCloser
var err error
var val []byte
enc := resp.Header.Get("Content-Encoding")
switch enc {
case "":
reader = resp.Body
case "deflate":
reader = flate.NewReader(resp.Body)
case "gzip":
reader, err = gzip.NewReader(resp.Body)
if err != nil {
return nil, err
}
default:
return nil, fmt.Errorf("Content-Encoding not support: %s", enc)
}
val, err = ioutil.ReadAll(reader)
if err != nil {
return nil, err
}
err = resp.Body.Close()
if err != nil {
return nil, err
}
resp.Body = ioutil.NopCloser(bytes.NewReader(val))
// delete the header in case the caller mistake the body being encoded
delete(resp.Header, "Content-Encoding")
return val, nil
}