micro/server/rpc_codec.go

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package server
import (
"bytes"
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"github.com/micro/go-micro/codec"
raw "github.com/micro/go-micro/codec/bytes"
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"github.com/micro/go-micro/codec/grpc"
"github.com/micro/go-micro/codec/json"
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"github.com/micro/go-micro/codec/jsonrpc"
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"github.com/micro/go-micro/codec/proto"
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"github.com/micro/go-micro/codec/protorpc"
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"github.com/micro/go-micro/transport"
"github.com/pkg/errors"
)
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type rpcCodec struct {
socket transport.Socket
codec codec.Codec
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first bool
req *transport.Message
buf *readWriteCloser
}
type readWriteCloser struct {
wbuf *bytes.Buffer
rbuf *bytes.Buffer
}
var (
DefaultContentType = "application/protobuf"
DefaultCodecs = map[string]codec.NewCodec{
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"application/grpc": grpc.NewCodec,
"application/grpc+json": grpc.NewCodec,
"application/grpc+proto": grpc.NewCodec,
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"application/json": json.NewCodec,
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"application/json-rpc": jsonrpc.NewCodec,
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"application/protobuf": proto.NewCodec,
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"application/proto-rpc": protorpc.NewCodec,
"application/octet-stream": raw.NewCodec,
}
)
func (rwc *readWriteCloser) Read(p []byte) (n int, err error) {
return rwc.rbuf.Read(p)
}
func (rwc *readWriteCloser) Write(p []byte) (n int, err error) {
return rwc.wbuf.Write(p)
}
func (rwc *readWriteCloser) Close() error {
rwc.rbuf.Reset()
rwc.wbuf.Reset()
return nil
}
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func newRpcCodec(req *transport.Message, socket transport.Socket, c codec.NewCodec) codec.Codec {
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rwc := &readWriteCloser{
rbuf: bytes.NewBuffer(req.Body),
wbuf: bytes.NewBuffer(nil),
}
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r := &rpcCodec{
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first: true,
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buf: rwc,
codec: c(rwc),
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req: req,
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socket: socket,
}
return r
}
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func (c *rpcCodec) ReadHeader(r *codec.Message, t codec.MessageType) error {
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// the initieal message
m := codec.Message{
Header: c.req.Header,
Body: c.req.Body,
}
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// if its a follow on request read it
if !c.first {
var tm transport.Message
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// read off the socket
if err := c.socket.Recv(&tm); err != nil {
return err
}
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// reset the read buffer
c.buf.rbuf.Reset()
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// write the body to the buffer
if _, err := c.buf.rbuf.Write(tm.Body); err != nil {
return err
}
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// set the message header
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m.Header = tm.Header
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// set the message body
m.Body = tm.Body
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}
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// no longer first read
c.first = false
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// set some internal things
m.Target = m.Header["X-Micro-Service"]
m.Method = m.Header["X-Micro-Method"]
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m.Id = m.Header["X-Micro-Id"]
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// read header via codec
err := c.codec.ReadHeader(&m, codec.Request)
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// set the method/id
r.Method = m.Method
r.Id = m.Id
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return err
}
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func (c *rpcCodec) ReadBody(b interface{}) error {
return c.codec.ReadBody(b)
}
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func (c *rpcCodec) Write(r *codec.Message, b interface{}) error {
c.buf.wbuf.Reset()
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// create a new message
m := &codec.Message{
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Method: r.Method,
Id: r.Id,
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Error: r.Error,
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Type: r.Type,
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Header: map[string]string{
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"X-Micro-Id": r.Id,
"X-Micro-Method": r.Method,
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"X-Micro-Error": r.Error,
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"Content-Type": c.req.Header["Content-Type"],
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},
}
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// the body being sent
var body []byte
// if we have encoded data just send it
if len(r.Body) > 0 {
body = r.Body
// write to the body
} else if err := c.codec.Write(m, b); err != nil {
c.buf.wbuf.Reset()
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// write an error if it failed
m.Error = errors.Wrapf(err, "Unable to encode body").Error()
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m.Header["X-Micro-Error"] = m.Error
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// no body to write
if err := c.codec.Write(m, nil); err != nil {
return err
}
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// write the body
} else {
// set the body
body = c.buf.wbuf.Bytes()
}
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// send on the socket
return c.socket.Send(&transport.Message{
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Header: m.Header,
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Body: body,
})
}
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func (c *rpcCodec) Close() error {
c.buf.Close()
c.codec.Close()
return c.socket.Close()
}
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func (c *rpcCodec) String() string {
return "rpc"
}