[GitHub] [pulsar] wolfstudy commented on a change in pull request #3904: [go schema] support go schema for pulsar-client-go

[GitBox <gi...@apache.org>]

wolfstudy commented on a change in pull request #3904: [go schema] support go schema for pulsar-client-go
URL: https://github.com/apache/pulsar/pull/3904#discussion_r271115850
 
 

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 File path: pulsar-client-go/pulsar/binaryfreelist.go
 ##########
 @@ -0,0 +1,318 @@
+//
+// 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 pulsar
+
+import (
+	"encoding/binary"
+	"fmt"
+	"io"
+	"math"
+)
+
+const (
+	IoMaxSize     = 1024
+	maxBorrowSize = 10
+)
+
+var (
+	bigEndian = binary.BigEndian
+)
+
+type BinaryFreeList chan []byte
+
+var BinarySerializer BinaryFreeList = make(chan []byte, IoMaxSize)
+
+func (b BinaryFreeList) Borrow() (buf []byte) {
+	select {
+	case buf = <-b:
+	default:
+		buf = make([]byte, maxBorrowSize)
+
+	}
+	return buf[:maxBorrowSize]
+}
+
+func (b BinaryFreeList) Return(buf []byte) {
+	select {
+	case b <- buf:
+	default:
+	}
+}
+
+func (b BinaryFreeList) Uint8(r io.Reader) (uint8, error) {
+	buf := b.Borrow()[:1]
+	if _, err := io.ReadFull(r, buf); err != nil {
+		b.Return(buf)
+		return 0, err
+	}
+	rv := buf[0]
+	b.Return(buf)
+	return rv, nil
+}
+
+func (b BinaryFreeList) Uint16(r io.Reader, byteOrder binary.ByteOrder) (uint16, error) {
+	buf := b.Borrow()[:2]
+	if _, err := io.ReadFull(r, buf); err != nil {
+		b.Return(buf)
+		return 0, err
+	}
+	rv := byteOrder.Uint16(buf)
+	b.Return(buf)
+	return rv, nil
+}
+
+func (b BinaryFreeList) Uint32(r io.Reader, byteOrder binary.ByteOrder) (uint32, error) {
+	buf := b.Borrow()[:4]
+	if _, err := io.ReadFull(r, buf); err != nil {
+		b.Return(buf)
+		return 0, err
+	}
+	rv := byteOrder.Uint32(buf)
+	b.Return(buf)
+	return rv, nil
+}
+
+func (b BinaryFreeList) Uint64(r io.Reader, byteOrder binary.ByteOrder) (uint64, error) {
+	buf := b.Borrow()[:8]
+	if _, err := io.ReadFull(r, buf); err != nil {
+		b.Return(buf)
+		return 0, err
+	}
+	rv := byteOrder.Uint64(buf)
+	b.Return(buf)
+	return rv, nil
+}
+
+func (b BinaryFreeList) Float64(buf []byte) (float64, error) {
+	if len(buf) < 8 {
+		return 0, fmt.Errorf("cannot decode binary double: %s", io.ErrShortBuffer)
+	}
+	return math.Float64frombits(binary.BigEndian.Uint64(buf[:8])), nil
+}
+
+func (b BinaryFreeList) Float32(buf []byte) (float32, error) {
+	if len(buf) < 4 {
+		return 0, fmt.Errorf("cannot decode binary float: %s", io.ErrShortBuffer)
+	}
+	return math.Float32frombits(binary.BigEndian.Uint32(buf[:4])), nil
+}
+
+func (b BinaryFreeList) PutUint8(w io.Writer, val uint8) error {
+	buf := b.Borrow()[:1]
+	buf[0] = val
+	_, err := w.Write(buf)
+	b.Return(buf)
+	return err
+}
+
+func (b BinaryFreeList) PutUint16(w io.Writer, byteOrder binary.ByteOrder, val uint16) error {
+	buf := b.Borrow()[:2]
+	byteOrder.PutUint16(buf, val)
+	_, err := w.Write(buf)
+	b.Return(buf)
+	return err
+}
+
+func (b BinaryFreeList) PutUint32(w io.Writer, byteOrder binary.ByteOrder, val uint32) error {
+
+	buf := b.Borrow()[:4]
+	byteOrder.PutUint32(buf, val)
+	_, err := w.Write(buf)
+	b.Return(buf)
+	return err
+}
+
+func (b BinaryFreeList) PutUint64(w io.Writer, byteOrder binary.ByteOrder, val uint64) error {
+	buf := b.Borrow()[:8]
+	byteOrder.PutUint64(buf, val)
+	_, err := w.Write(buf)
+	b.Return(buf)
+	return err
+}
+
+func (b BinaryFreeList) PutFloat64(datum interface{}) ([]byte, error) {
+	var value float64
+	switch v := datum.(type) {
+	case float64:
+		value = v
+	case float32:
+		value = float64(v)
+	case int:
+		if value = float64(v); int(value) != v {
+			return nil, fmt.Errorf("serialize failed: provided Go int would lose precision: %d", v)
+		}
+	case int64:
+		if value = float64(v); int64(value) != v {
+			return nil, fmt.Errorf("serialize failed: provided Go int64 would lose precision: %d", v)
+		}
+	case int32:
+		if value = float64(v); int32(value) != v {
+			return nil, fmt.Errorf("serialize failed: provided Go int32 would lose precision: %d", v)
+		}
+	default:
+		return nil, fmt.Errorf("serialize failed: expected: Go numeric; received: %T", datum)
+	}
+	var buf []byte
+	buf = append(buf, 0, 0, 0, 0, 0, 0, 0, 0)
+	binary.BigEndian.PutUint64(buf[len(buf)-8:], math.Float64bits(value))
+	return buf, nil
+}
+
+func (b BinaryFreeList) PutFloat32(datum interface{}) ([]byte, error) {
+	var value float32
+	switch v := datum.(type) {
+	case float32:
+		value = v
+	case float64:
+		value = float32(v)
+	case int:
+		if value = float32(v); int(value) != v {
+			return nil, fmt.Errorf("serialize failed: provided Go int would lose precision: %d", v)
+		}
+	case int64:
+		if value = float32(v); int64(value) != v {
+			return nil, fmt.Errorf("serialize failed: provided Go int64 would lose precision: %d", v)
+		}
+	case int32:
+		if value = float32(v); int32(value) != v {
+			return nil, fmt.Errorf("serialize failed: provided Go int32 would lose precision: %d", v)
+		}
+	default:
+		return nil, fmt.Errorf("serialize failed: expected: Go numeric; received: %T", datum)
+	}
+	var buf []byte
+	buf = append(buf, 0, 0, 0, 0)
+	binary.BigEndian.PutUint32(buf[len(buf)-4:], uint32(math.Float32bits(value)))
+	return buf, nil
+}
+
+func ReadElements(r io.Reader, elements ...interface{}) error {
+	for _, element := range elements {
+		err := readElement(r, element)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func WriteElements(w io.Writer, elements ...interface{}) error {
+	for _, element := range elements {
+		err := writeElement(w, element)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func readElement(r io.Reader, element interface{}) error {
+	switch e := element.(type) {
+	case *int8:
+		rv, err := BinarySerializer.Uint8(r)
+		if err != nil {
+			return err
+		}
+		*e = int8(rv)
+		return nil
+
+	case *int16:
+		rv, err := BinarySerializer.Uint16(r, bigEndian)
+		if err != nil {
+			return err
+		}
+		*e = int16(rv)
+		return nil
+
+	case *int32:
+		rv, err := BinarySerializer.Uint32(r, bigEndian)
+		if err != nil {
+			return err
+		}
+		*e = int32(rv)
+		return nil
+
+	case *int64:
+		rv, err := BinarySerializer.Uint64(r, bigEndian)
+		if err != nil {
+			return err
+		}
+		*e = int64(rv)
+		return nil
+
+	case *bool:
+		rv, err := BinarySerializer.Uint8(r)
+		if err != nil {
+			return err
+		}
+		if rv == 0x00 {
+			*e = false
+		} else {
+			*e = true
+		}
+		return nil
+	}
+	return binary.Read(r, bigEndian, element)
+}
+
+func writeElement(w io.Writer, element interface{}) error {
 
 Review comment:
   yes, good idea. 

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