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113 lines
2.2 KiB
113 lines
2.2 KiB
package pgdriver
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import (
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"encoding/binary"
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"io"
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"sync"
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)
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var wbPool = sync.Pool{
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New: func() interface{} {
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return newWriteBuffer()
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},
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}
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func getWriteBuffer() *writeBuffer {
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wb := wbPool.Get().(*writeBuffer)
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return wb
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}
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func putWriteBuffer(wb *writeBuffer) {
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wb.Reset()
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wbPool.Put(wb)
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}
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type writeBuffer struct {
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Bytes []byte
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msgStart int
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paramStart int
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}
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func newWriteBuffer() *writeBuffer {
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return &writeBuffer{
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Bytes: make([]byte, 0, 1024),
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}
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}
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func (b *writeBuffer) Reset() {
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b.Bytes = b.Bytes[:0]
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}
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func (b *writeBuffer) StartMessage(c byte) {
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if c == 0 {
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b.msgStart = len(b.Bytes)
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b.Bytes = append(b.Bytes, 0, 0, 0, 0)
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} else {
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b.msgStart = len(b.Bytes) + 1
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b.Bytes = append(b.Bytes, c, 0, 0, 0, 0)
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}
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}
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func (b *writeBuffer) FinishMessage() {
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binary.BigEndian.PutUint32(
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b.Bytes[b.msgStart:], uint32(len(b.Bytes)-b.msgStart))
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}
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func (b *writeBuffer) Query() []byte {
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return b.Bytes[b.msgStart+4 : len(b.Bytes)-1]
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}
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func (b *writeBuffer) StartParam() {
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b.paramStart = len(b.Bytes)
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b.Bytes = append(b.Bytes, 0, 0, 0, 0)
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}
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func (b *writeBuffer) FinishParam() {
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binary.BigEndian.PutUint32(
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b.Bytes[b.paramStart:], uint32(len(b.Bytes)-b.paramStart-4))
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}
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var nullParamLength = int32(-1)
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func (b *writeBuffer) FinishNullParam() {
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binary.BigEndian.PutUint32(
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b.Bytes[b.paramStart:], uint32(nullParamLength))
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}
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func (b *writeBuffer) Write(data []byte) (int, error) {
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b.Bytes = append(b.Bytes, data...)
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return len(data), nil
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}
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func (b *writeBuffer) WriteInt16(num int16) {
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b.Bytes = append(b.Bytes, 0, 0)
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binary.BigEndian.PutUint16(b.Bytes[len(b.Bytes)-2:], uint16(num))
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}
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func (b *writeBuffer) WriteInt32(num int32) {
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b.Bytes = append(b.Bytes, 0, 0, 0, 0)
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binary.BigEndian.PutUint32(b.Bytes[len(b.Bytes)-4:], uint32(num))
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}
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func (b *writeBuffer) WriteString(s string) {
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b.Bytes = append(b.Bytes, s...)
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b.Bytes = append(b.Bytes, 0)
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}
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func (b *writeBuffer) WriteBytes(data []byte) {
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b.Bytes = append(b.Bytes, data...)
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b.Bytes = append(b.Bytes, 0)
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}
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func (b *writeBuffer) WriteByte(c byte) error {
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b.Bytes = append(b.Bytes, c)
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return nil
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}
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func (b *writeBuffer) ReadFrom(r io.Reader) (int64, error) {
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n, err := r.Read(b.Bytes[len(b.Bytes):cap(b.Bytes)])
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b.Bytes = b.Bytes[:len(b.Bytes)+n]
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return int64(n), err
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}
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