/
netretry.go
82 lines (68 loc) · 2.15 KB
/
netretry.go
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package common
import (
"fmt"
"net"
"net/http"
"reflect"
"time"
"github.com/tencentcloud/tencentcloud-sdk-go-intl-en/tencentcloud/common/errors"
"github.com/tencentcloud/tencentcloud-sdk-go-intl-en/tencentcloud/common/profile"
)
const (
tplNetworkFailureRetry = "[WARN] temporary network failure, retrying (%d/%d) in %f seconds: %s"
)
func (c *Client) sendWithNetworkFailureRetry(req *http.Request, retryable bool) (resp *http.Response, err error) {
// make sure maxRetries is more than or equal 0
var maxRetries int
if retryable {
maxRetries = maxInt(c.profile.NetworkFailureMaxRetries, 0)
}
durationFunc := safeDurationFunc(c.profile.NetworkFailureRetryDuration)
for idx := 0; idx <= maxRetries; idx++ {
resp, err = c.sendHttp(req)
// retry when error occurred and retryable and not the last retry
// should not sleep on last retry even if it's retryable
if err != nil && retryable && idx < maxRetries {
if err, ok := err.(net.Error); ok && (err.Timeout() || err.Temporary()) {
duration := durationFunc(idx)
if c.debug {
c.logger.Printf(tplNetworkFailureRetry, idx, maxRetries, duration.Seconds(), err.Error())
}
time.Sleep(duration)
continue
}
}
if err != nil {
msg := fmt.Sprintf("Fail to get response because %s", err)
err = errors.NewTencentCloudSDKError("ClientError.NetworkError", msg, "")
}
return resp, err
}
return resp, err
}
func maxInt(a, b int) int {
if a > b {
return a
}
return b
}
func safeDurationFunc(durationFunc profile.DurationFunc) profile.DurationFunc {
if durationFunc != nil {
return durationFunc
}
return profile.ExponentialBackoff
}
// isRetryable means if request is retryable or not,
// depends on if request has a `ClientToken` field or not,
// request with `ClientToken` means it's idempotent and retryable,
// unretryable request SHOULDN'T retry for temporary network failure
func isRetryable(obj interface{}) bool {
// obj Must be struct ptr
getType := reflect.TypeOf(obj)
if getType.Kind() != reflect.Ptr || getType.Elem().Kind() != reflect.Struct {
return false
}
// obj Must exist named field
_, ok := getType.Elem().FieldByName(fieldClientToken)
return ok
}