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-rw-r--r--vendor/github.com/juju/ratelimit/reader.go51
1 files changed, 51 insertions, 0 deletions
diff --git a/vendor/github.com/juju/ratelimit/reader.go b/vendor/github.com/juju/ratelimit/reader.go
new file mode 100644
index 000000000..6403bf78d
--- /dev/null
+++ b/vendor/github.com/juju/ratelimit/reader.go
@@ -0,0 +1,51 @@
+// Copyright 2014 Canonical Ltd.
+// Licensed under the LGPLv3 with static-linking exception.
+// See LICENCE file for details.
+
+package ratelimit
+
+import "io"
+
+type reader struct {
+ r io.Reader
+ bucket *Bucket
+}
+
+// Reader returns a reader that is rate limited by
+// the given token bucket. Each token in the bucket
+// represents one byte.
+func Reader(r io.Reader, bucket *Bucket) io.Reader {
+ return &reader{
+ r: r,
+ bucket: bucket,
+ }
+}
+
+func (r *reader) Read(buf []byte) (int, error) {
+ n, err := r.r.Read(buf)
+ if n <= 0 {
+ return n, err
+ }
+ r.bucket.Wait(int64(n))
+ return n, err
+}
+
+type writer struct {
+ w io.Writer
+ bucket *Bucket
+}
+
+// Writer returns a reader that is rate limited by
+// the given token bucket. Each token in the bucket
+// represents one byte.
+func Writer(w io.Writer, bucket *Bucket) io.Writer {
+ return &writer{
+ w: w,
+ bucket: bucket,
+ }
+}
+
+func (w *writer) Write(buf []byte) (int, error) {
+ w.bucket.Wait(int64(len(buf)))
+ return w.w.Write(buf)
+}