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message.go
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message.go
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package gateway
import (
"bytes"
"encoding/binary"
"fmt"
"io"
"github.com/joyparty/gokit"
"github.com/joyparty/nodehub/proto/nh"
"google.golang.org/protobuf/proto"
)
const sizeLen = 4
var (
bbPool = gokit.NewPoolOf(func() *bytes.Buffer {
return bytes.NewBuffer(make([]byte, 0, 1024))
})
msgPool = &messagePool{
pool: make(chan *message, 1024),
}
)
func sendReply(reply *nh.Reply, sender func([]byte) error) error {
data, err := proto.Marshal(reply)
if err != nil {
return fmt.Errorf("marshal reply, %w", err)
}
return sendBytes(data, sender)
}
func sendBytes(data []byte, sender func([]byte) error) error {
buf := bbPool.Get()
defer bbPool.Put(buf)
buf.Reset()
if err := binary.Write(buf, binary.BigEndian, uint32(len(data))); err != nil {
return fmt.Errorf("write size frame, %w", err)
}
if len(data) > 0 {
if err := binary.Write(buf, binary.BigEndian, data); err != nil {
return fmt.Errorf("write data frame, %w", err)
}
}
return sender(buf.Bytes())
}
type message struct {
data []byte
size int
}
func newMessage() *message {
return &message{
data: make([]byte, 4*1024), // default 4k
}
}
func (msg message) Bytes() []byte {
return msg.data[:msg.size]
}
func readMessage(r io.Reader, msg *message) error {
if _, err := io.ReadFull(r, msg.data[:sizeLen]); err != nil {
return fmt.Errorf("read size frame, %w", err)
}
msg.size = int(binary.BigEndian.Uint32(msg.data[:sizeLen]))
if msg.size == 0 {
return nil
} else if msg.size > MaxMessageSize {
return fmt.Errorf("message size exceeds the limit, %d", msg.size)
}
// grow bytes
if c, s := cap(msg.data), msg.size; s > c {
msg.data = append(msg.data[:c], make([]byte, s-c)...)
}
if _, err := io.ReadFull(r, msg.data[:msg.size]); err != nil {
return fmt.Errorf("read data frame, %w", err)
}
return nil
}
type messagePool struct {
pool chan *message
}
func (p *messagePool) Get() *message {
select {
case msg := <-p.pool:
msg.size = 0
return msg
default:
return newMessage()
}
}
func (p *messagePool) Put(msg *message) {
select {
case p.pool <- msg:
default:
}
}