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onedrive: add support "Retry-After" header

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Motonori IWAMURO 2020-01-29 21:16:18 +09:00 committed by GitHub
parent bfd9f32188
commit 7662f15939
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1 changed files with 24 additions and 6 deletions
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28
backend/onedrive/onedrive.go
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@ -12,6 +12,7 @@ import (
"log"
"net/http"
"path"
"strconv"
"strings"
"time"
@ -380,13 +381,30 @@ var retryErrorCodes = []int{
// shouldRetry returns a boolean as to whether this resp and err
// deserve to be retried. It returns the err as a convenience
func shouldRetry(resp *http.Response, err error) (bool, error) {
authRetry := false
if resp != nil && resp.StatusCode == 401 && len(resp.Header["Www-Authenticate"]) == 1 && strings.Index(resp.Header["Www-Authenticate"][0], "expired_token") >= 0 {
authRetry = true
retry := false
if resp != nil {
switch resp.StatusCode {
case 401:
if len(resp.Header["Www-Authenticate"]) == 1 && strings.Index(resp.Header["Www-Authenticate"][0], "expired_token") >= 0 {
retry = true
fs.Debugf(nil, "Should retry: %v", err)
}
return authRetry || fserrors.ShouldRetry(err) || fserrors.ShouldRetryHTTP(resp, retryErrorCodes), err
case 429: // Too Many Requests.
// see https://docs.microsoft.com/en-us/sharepoint/dev/general-development/how-to-avoid-getting-throttled-or-blocked-in-sharepoint-online
if values := resp.Header["Retry-After"]; len(values) == 1 && values[0] != "" {
retryAfter, parseErr := strconv.Atoi(values[0])
if parseErr != nil {
fs.Debugf(nil, "Failed to parse Retry-After: %q: %v", values[0], parseErr)
} else {
duration := time.Second * time.Duration(retryAfter)
retry = true
err = pacer.RetryAfterError(err, duration)
fs.Debugf(nil, "Too many requests. Trying again in %d seconds.", retryAfter)
}
}
}
}
return retry || fserrors.ShouldRetry(err) || fserrors.ShouldRetryHTTP(resp, retryErrorCodes), err
}
// readMetaDataForPathRelativeToID reads the metadata for a path relative to an item that is addressed by its normalized ID.