rename models to pkg (#2005)

pkg/util/limit/reader.go

@@ -0,0 +1,51 @@
+// Copyright 2019 fatedier, fatedier@gmail.com
+//
+// 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 limit
+
+import (
+	"context"
+	"io"
+
+	"golang.org/x/time/rate"
+)
+
+type Reader struct {
+	r       io.Reader
+	limiter *rate.Limiter
+}
+
+func NewReader(r io.Reader, limiter *rate.Limiter) *Reader {
+	return &Reader{
+		r:       r,
+		limiter: limiter,
+	}
+}
+
+func (r *Reader) Read(p []byte) (n int, err error) {
+	b := r.limiter.Burst()
+	if b < len(p) {
+		p = p[:b]
+	}
+	n, err = r.r.Read(p)
+	if err != nil {
+		return
+	}
+
+	err = r.limiter.WaitN(context.Background(), n)
+	if err != nil {
+		return
+	}
+	return
+}

pkg/util/limit/writer.go

@@ -0,0 +1,60 @@
+// Copyright 2019 fatedier, fatedier@gmail.com
+//
+// 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 limit
+
+import (
+	"context"
+	"io"
+
+	"golang.org/x/time/rate"
+)
+
+type Writer struct {
+	w       io.Writer
+	limiter *rate.Limiter
+}
+
+func NewWriter(w io.Writer, limiter *rate.Limiter) *Writer {
+	return &Writer{
+		w:       w,
+		limiter: limiter,
+	}
+}
+
+func (w *Writer) Write(p []byte) (n int, err error) {
+	var nn int
+	b := w.limiter.Burst()
+	for {
+		end := len(p)
+		if end == 0 {
+			break
+		}
+		if b < len(p) {
+			end = b
+		}
+		err = w.limiter.WaitN(context.Background(), end)
+		if err != nil {
+			return
+		}
+
+		nn, err = w.w.Write(p[:end])
+		n += nn
+		if err != nil {
+			return
+		}
+		p = p[end:]
+	}
+	return
+}