/
stream.go
68 lines (62 loc) · 1.26 KB
/
stream.go
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package protocol
import (
"bytes"
"net"
"github.com/StinkyPeach/bridge/common/pool"
)
// NewConn wraps a stream-oriented net.Conn with protocol decoding/encoding
func NewConn(c net.Conn, p Protocol, iv []byte) net.Conn {
return &Conn{Conn: c, Protocol: p.initForConn(iv)}
}
// Conn represents a protocol connection
type Conn struct {
net.Conn
Protocol
buf []byte
offset int
underDecoded bytes.Buffer
}
func (c *Conn) Read(b []byte) (int, error) {
if c.buf != nil {
n := copy(b, c.buf[c.offset:])
c.offset += n
if c.offset == len(c.buf) {
c.buf = nil
}
return n, nil
}
buf := pool.Get(pool.RelayBufferSize)
defer pool.Put(buf)
n, err := c.Conn.Read(buf)
if err != nil {
return 0, err
}
c.underDecoded.Write(buf[:n])
underDecoded := c.underDecoded.Bytes()
decoded, length, err := c.Decode(underDecoded)
if err != nil {
c.underDecoded.Reset()
return 0, nil
}
if length == 0 {
return 0, nil
}
c.underDecoded.Next(length)
n = copy(b, decoded)
if len(decoded) > len(b) {
c.buf = decoded
c.offset = n
}
return n, nil
}
func (c *Conn) Write(b []byte) (int, error) {
encoded, err := c.Encode(b)
if err != nil {
return 0, err
}
_, err = c.Conn.Write(encoded)
if err != nil {
return 0, err
}
return len(b), nil
}