1 files changed, 148 insertions, 0 deletions

diff --git a/vendor/github.com/minio/minio-go/v7/retry.go b/vendor/github.com/minio/minio-go/v7/retry.go
new file mode 100644
index 0000000..1c6105e
--- /dev/null
+++ b/vendor/github.com/minio/minio-go/v7/retry.go
@@ -0,0 +1,148 @@
+/*
+ * MinIO Go Library for Amazon S3 Compatible Cloud Storage
+ * Copyright 2015-2017 MinIO, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package minio
+
+import (
+        "context"
+        "crypto/x509"
+        "errors"
+        "net/http"
+        "net/url"
+        "time"
+)
+
+// MaxRetry is the maximum number of retries before stopping.
+var MaxRetry = 10
+
+// MaxJitter will randomize over the full exponential backoff time
+const MaxJitter = 1.0
+
+// NoJitter disables the use of jitter for randomizing the exponential backoff time
+const NoJitter = 0.0
+
+// DefaultRetryUnit - default unit multiplicative per retry.
+// defaults to 200 * time.Millisecond
+var DefaultRetryUnit = 200 * time.Millisecond
+
+// DefaultRetryCap - Each retry attempt never waits no longer than
+// this maximum time duration.
+var DefaultRetryCap = time.Second
+
+// newRetryTimer creates a timer with exponentially increasing
+// delays until the maximum retry attempts are reached.
+func (c *Client) newRetryTimer(ctx context.Context, maxRetry int, unit, cap time.Duration, jitter float64) <-chan int {
+        attemptCh := make(chan int)
+
+        // computes the exponential backoff duration according to
+        // https://www.awsarchitectureblog.com/2015/03/backoff.html
+        exponentialBackoffWait := func(attempt int) time.Duration {
+                // normalize jitter to the range [0, 1.0]
+                if jitter < NoJitter {
+                        jitter = NoJitter
+                }
+                if jitter > MaxJitter {
+                        jitter = MaxJitter
+                }
+
+                // sleep = random_between(0, min(cap, base * 2 ** attempt))
+                sleep := unit * time.Duration(1<<uint(attempt))
+                if sleep > cap {
+                        sleep = cap
+                }
+                if jitter != NoJitter {
+                        sleep -= time.Duration(c.random.Float64() * float64(sleep) * jitter)
+                }
+                return sleep
+        }
+
+        go func() {
+                defer close(attemptCh)
+                for i := 0; i < maxRetry; i++ {
+                        select {
+                        case attemptCh <- i + 1:
+                        case <-ctx.Done():
+                                return
+                        }
+
+                        select {
+                        case <-time.After(exponentialBackoffWait(i)):
+                        case <-ctx.Done():
+                                return
+                        }
+                }
+        }()
+        return attemptCh
+}
+
+// List of AWS S3 error codes which are retryable.
+var retryableS3Codes = map[string]struct{}{
+        "RequestError":          {},
+        "RequestTimeout":        {},
+        "Throttling":            {},
+        "ThrottlingException":   {},
+        "RequestLimitExceeded":  {},
+        "RequestThrottled":      {},
+        "InternalError":         {},
+        "ExpiredToken":          {},
+        "ExpiredTokenException": {},
+        "SlowDown":              {},
+        // Add more AWS S3 codes here.
+}
+
+// isS3CodeRetryable - is s3 error code retryable.
+func isS3CodeRetryable(s3Code string) (ok bool) {
+        _, ok = retryableS3Codes[s3Code]
+        return ok
+}
+
+// List of HTTP status codes which are retryable.
+var retryableHTTPStatusCodes = map[int]struct{}{
+        429:                            {}, // http.StatusTooManyRequests is not part of the Go 1.5 library, yet
+        499:                            {}, // client closed request, retry. A non-standard status code introduced by nginx.
+        http.StatusInternalServerError: {},
+        http.StatusBadGateway:          {},
+        http.StatusServiceUnavailable:  {},
+        http.StatusGatewayTimeout:      {},
+        // Add more HTTP status codes here.
+}
+
+// isHTTPStatusRetryable - is HTTP error code retryable.
+func isHTTPStatusRetryable(httpStatusCode int) (ok bool) {
+        _, ok = retryableHTTPStatusCodes[httpStatusCode]
+        return ok
+}
+
+// For now, all http Do() requests are retriable except some well defined errors
+func isRequestErrorRetryable(err error) bool {
+        if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
+                return false
+        }
+        if ue, ok := err.(*url.Error); ok {
+                e := ue.Unwrap()
+                switch e.(type) {
+                // x509: certificate signed by unknown authority
+                case x509.UnknownAuthorityError:
+                        return false
+                }
+                switch e.Error() {
+                case "http: server gave HTTP response to HTTPS client":
+                        return false
+                }
+        }
+        return true
+}