Add bufferchain for HTTP2 stream

buffer/bufferchain.go

@@ -0,0 +1,188 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 buffer
+
+import (
+	"errors"
+	"io"
+	"sync"
+	"time"
+)
+
+// ErrWriteCovered bufferchain queue is full.
+var ErrWriteCovered = errors.New("chain write covered")
+
+const defaultCapacity = 1 << 9
+
+/*
+ * ioBufferchain
+ * For HTTP2 stream, in order not to break the structure-adaptation interface.
+ */
+type ioBufferchain struct {
+	bufferchain chan []byte
+	errChan     chan error
+	mutex       sync.Mutex
+}
+
+// NewIoBufferChain returns *bufferChain.
+func NewIoBufferChain(capacity int) *ioBufferchain {
+	if capacity == 0 {
+		capacity = defaultCapacity
+	}
+
+	return &ioBufferchain{
+		bufferchain: make(chan []byte, capacity),
+		errChan:     make(chan error),
+	}
+}
+
+func (bc *ioBufferchain) Bytes() (p []byte) {
+	p, b := <-bc.bufferchain
+	if !b {
+		return nil
+	}
+
+	return p
+}
+
+func (bc *ioBufferchain) Write(p []byte) (n int, err error) {
+	bytes := *GetBytes(len(p))
+	copy(bytes, p)
+	select {
+	case <-bc.errChan:
+		return 0, io.EOF
+	default:
+		bc.mutex.Lock()
+		defer bc.mutex.Unlock()
+		select {
+		case bc.bufferchain <- bytes:
+			return len(bytes), nil
+		default:
+			// chain is full conn goutine wait 1s to consumer
+			ticker := time.NewTicker(1 * time.Second)
+			select {
+			case <-bc.errChan:
+				return 0, io.EOF
+			case bc.bufferchain <- bytes:
+				ticker.Stop()
+
+				return len(bytes), nil
+			case <-ticker.C:
+				return 0, ErrWriteCovered
+			}
+		}
+	}
+}
+
+func (bc *ioBufferchain) CloseWithError(_ error) {
+	select {
+	case <-bc.errChan:
+		return
+	default:
+		close(bc.errChan)
+		bc.mutex.Lock()
+		defer bc.mutex.Unlock()
+		close(bc.bufferchain)
+	}
+}
+
+func (bc *ioBufferchain) Count(int32) int32 {
+	return 1
+}
+
+func (bc *ioBufferchain) Len() int {
+	return 0
+}
+
+func (bc *ioBufferchain) Read(p []byte) (n int, err error) {
+	return 0, EOF
+}
+
+func (bc *ioBufferchain) ReadOnce(r io.Reader) (n int64, err error) {
+	return 0, EOF
+}
+
+func (bc *ioBufferchain) ReadFrom(r io.Reader) (n int64, err error) {
+	return 0, EOF
+}
+
+func (bc *ioBufferchain) Grow(n int) error {
+	return EOF
+}
+
+func (bc *ioBufferchain) WriteString(s string) (n int, err error) {
+	return 0, EOF
+}
+
+func (bc *ioBufferchain) WriteByte(p byte) error {
+	return EOF
+}
+
+func (bc *ioBufferchain) WriteUint16(p uint16) error {
+	return EOF
+}
+
+func (bc *ioBufferchain) WriteUint32(p uint32) error {
+	return EOF
+}
+
+func (bc *ioBufferchain) WriteUint64(p uint64) error {
+	return EOF
+}
+
+func (bc *ioBufferchain) WriteTo(w io.Writer) (n int64, err error) {
+	return 0, EOF
+}
+
+func (bc *ioBufferchain) Peek(n int) []byte {
+	return nil
+}
+
+func (bc *ioBufferchain) Drain(offset int) {
+}
+
+func (bc *ioBufferchain) Cap() int {
+	return 0
+}
+
+func (bc *ioBufferchain) Reset() {}
+
+func (bc *ioBufferchain) Clone() IoBuffer {
+	return nil
+}
+
+func (bc *ioBufferchain) String() string {
+	return ""
+}
+
+func (bc *ioBufferchain) Alloc(int) {
+}
+
+func (bc *ioBufferchain) Free() {
+}
+
+func (bc *ioBufferchain) EOF() bool {
+	return true
+}
+
+func (bc *ioBufferchain) SetEOF(eof bool) {
+}
+
+func (bc *ioBufferchain) Append(data []byte) error {
+	return EOF
+}

buffer/bufferchain_test.go

@@ -0,0 +1,77 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 buffer
+
+import (
+	"sync/atomic"
+	"testing"
+	"time"
+)
+
+//Test write
+func TestBufferWrite(t *testing.T) {
+	chain := NewIoBufferChain(10)
+	write := func(i *int32) error {
+		bytes := make([]byte, 1)
+		_, err := chain.Write(bytes)
+		if err == nil {
+			atomic.AddInt32(i, 1)
+		}
+		return err
+	}
+	var i int32
+	go func() {
+		var err error
+		for i <= 20 {
+			err = write(&i)
+			if err != nil {
+				break
+			}
+		}
+
+		if i != 10 {
+			t.Errorf("Capacity of bufferchain error %d", i)
+		}
+		err = write(&i)
+		if err == nil {
+			t.Error("Consumption timeout err")
+		}
+	}()
+	time.Sleep(2 * time.Second)
+	chain.CloseWithError(nil)
+}
+
+func TestBufferReade(t *testing.T) {
+	chain := NewIoBufferChain(10)
+	chain.Write(make([]byte, 1))
+	chain.Write(make([]byte, 1))
+	var i int32
+	reader := func(i *int32) {
+		_ = chain.Bytes()
+		atomic.AddInt32(i, 1)
+	}
+	go func() {
+		for {
+			reader(&i)
+		}
+	}()
+	time.Sleep(1 * time.Second)
+	chain.CloseWithError(nil)
+	if i != 2 {
+		t.Error("Message number error")
+	}
+}