mirror of https://github.com/hashicorp/consul
123 lines
2.8 KiB
Go
123 lines
2.8 KiB
Go
package msgpackrpc
|
|
|
|
import (
|
|
"bufio"
|
|
"io"
|
|
"net/rpc"
|
|
"sync"
|
|
|
|
"github.com/hashicorp/go-msgpack/codec"
|
|
)
|
|
|
|
var (
|
|
// msgpackHandle is shared handle for decoding
|
|
msgpackHandle = &codec.MsgpackHandle{}
|
|
)
|
|
|
|
// MsgpackCodec implements the rpc.ClientCodec and rpc.ServerCodec
|
|
// using the msgpack encoding
|
|
type MsgpackCodec struct {
|
|
closed bool
|
|
conn io.ReadWriteCloser
|
|
bufR *bufio.Reader
|
|
bufW *bufio.Writer
|
|
enc *codec.Encoder
|
|
dec *codec.Decoder
|
|
writeLock sync.Mutex
|
|
}
|
|
|
|
// NewCodec returns a MsgpackCodec that can be used as either a Client or Server
|
|
// rpc Codec using a default handle. It also provides controls for enabling and
|
|
// disabling buffering for both reads and writes.
|
|
func NewCodec(bufReads, bufWrites bool, conn io.ReadWriteCloser) *MsgpackCodec {
|
|
return NewCodecFromHandle(bufReads, bufWrites, conn, msgpackHandle)
|
|
}
|
|
|
|
// NewCodecFromHandle returns a MsgpackCodec that can be used as either a Client
|
|
// or Server rpc Codec using the passed handle. It also provides controls for
|
|
// enabling and disabling buffering for both reads and writes.
|
|
func NewCodecFromHandle(bufReads, bufWrites bool, conn io.ReadWriteCloser,
|
|
h *codec.MsgpackHandle) *MsgpackCodec {
|
|
cc := &MsgpackCodec{
|
|
conn: conn,
|
|
}
|
|
if bufReads {
|
|
cc.bufR = bufio.NewReader(conn)
|
|
cc.dec = codec.NewDecoder(cc.bufR, h)
|
|
} else {
|
|
cc.dec = codec.NewDecoder(cc.conn, h)
|
|
}
|
|
if bufWrites {
|
|
cc.bufW = bufio.NewWriter(conn)
|
|
cc.enc = codec.NewEncoder(cc.bufW, h)
|
|
} else {
|
|
cc.enc = codec.NewEncoder(cc.conn, h)
|
|
}
|
|
return cc
|
|
}
|
|
|
|
func (cc *MsgpackCodec) ReadRequestHeader(r *rpc.Request) error {
|
|
return cc.read(r)
|
|
}
|
|
|
|
func (cc *MsgpackCodec) ReadRequestBody(out interface{}) error {
|
|
return cc.read(out)
|
|
}
|
|
|
|
func (cc *MsgpackCodec) WriteResponse(r *rpc.Response, body interface{}) error {
|
|
cc.writeLock.Lock()
|
|
defer cc.writeLock.Unlock()
|
|
return cc.write(r, body)
|
|
}
|
|
|
|
func (cc *MsgpackCodec) ReadResponseHeader(r *rpc.Response) error {
|
|
return cc.read(r)
|
|
}
|
|
|
|
func (cc *MsgpackCodec) ReadResponseBody(out interface{}) error {
|
|
return cc.read(out)
|
|
}
|
|
|
|
func (cc *MsgpackCodec) WriteRequest(r *rpc.Request, body interface{}) error {
|
|
cc.writeLock.Lock()
|
|
defer cc.writeLock.Unlock()
|
|
return cc.write(r, body)
|
|
}
|
|
|
|
func (cc *MsgpackCodec) Close() error {
|
|
if cc.closed {
|
|
return nil
|
|
}
|
|
cc.closed = true
|
|
return cc.conn.Close()
|
|
}
|
|
|
|
func (cc *MsgpackCodec) write(obj1, obj2 interface{}) (err error) {
|
|
if cc.closed {
|
|
return io.EOF
|
|
}
|
|
if err = cc.enc.Encode(obj1); err != nil {
|
|
return
|
|
}
|
|
if err = cc.enc.Encode(obj2); err != nil {
|
|
return
|
|
}
|
|
if cc.bufW != nil {
|
|
return cc.bufW.Flush()
|
|
}
|
|
return
|
|
}
|
|
|
|
func (cc *MsgpackCodec) read(obj interface{}) (err error) {
|
|
if cc.closed {
|
|
return io.EOF
|
|
}
|
|
|
|
// If nil is passed in, we should still attempt to read content to nowhere.
|
|
if obj == nil {
|
|
var obj2 interface{}
|
|
return cc.dec.Decode(&obj2)
|
|
}
|
|
return cc.dec.Decode(obj)
|
|
}
|