/
conn.go
115 lines (97 loc) · 2.03 KB
/
conn.go
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package rpcd
import (
"encoding/binary"
"errors"
"io"
"net"
"github.com/imkouga/gocore/loger"
)
func sendFrame(w io.Writer, data []byte) error {
// Allocate enough space for the biggest uvarint
var size [binary.MaxVarintLen64]byte
if len(data) <= 0 {
n := binary.PutUvarint(size[:], uint64(0))
return write(w, size[:n], false)
}
// Write the size and data
n := binary.PutUvarint(size[:], uint64(len(data)))
if err := write(w, size[:n], false); err != nil {
return err
}
if err := write(w, data, false); err != nil {
return err
}
return nil
}
func recvFrame(r io.Reader) ([]byte, error) {
var (
size uint64
data []byte
err error
)
size, err = readUvarint(r)
loger.Trace("rpcd.recvFrame size:", size, ", err: ", err)
if err != nil || size <= 0 {
return nil, err
}
data = make([]byte, size)
err = read(r, data)
return data, err
}
// ReadUvarint reads an encoded unsigned integer from r and returns it as a uint64.
func readUvarint(r io.Reader) (uint64, error) {
var (
x uint64
s uint
b byte
err error
)
for i := 0; ; i++ {
if b, err = readByte(r); nil != err {
return 0, err
}
if i > 9 || (i == 9 && b > 1) {
return x, errors.New("rpcd: varint overflows a 64-bit integer")
}
if b < 0x80 {
return x | uint64(b)<<s, nil
}
x |= uint64(b&0x7f) << s
s += 7
}
}
func read(r io.Reader, data []byte) error {
for index := 0; index < len(data); {
n, err := r.Read(data[index:])
if err != nil {
if nerr, ok := err.(net.Error); !ok || !nerr.Temporary() {
return err
}
}
index += n
}
return nil
}
func readByte(r io.Reader) (byte, error) {
data := make([]byte, 1)
if err := read(r, data); err != nil {
return 0, err
}
return data[0], nil
}
func write(w io.Writer, data []byte, onePacket bool) error {
if onePacket {
_, err := w.Write(data)
return err
}
for index := 0; index < len(data); {
n, err := w.Write(data[index:])
if err != nil {
if nerr, ok := err.(net.Error); !ok || !nerr.Temporary() {
return err
}
}
index += n
}
return nil
}