micro/client/rpc_codec.go

260 lines
5.5 KiB
Go
Raw Normal View History

package client
import (
"bytes"
2016-12-06 22:40:44 +03:00
errs "errors"
"github.com/micro/go-micro/codec"
raw "github.com/micro/go-micro/codec/bytes"
2019-01-13 22:54:07 +03:00
"github.com/micro/go-micro/codec/grpc"
2019-01-01 01:01:16 +03:00
"github.com/micro/go-micro/codec/json"
2015-11-28 21:54:38 +03:00
"github.com/micro/go-micro/codec/jsonrpc"
2019-01-02 15:55:06 +03:00
"github.com/micro/go-micro/codec/proto"
2015-11-28 21:54:38 +03:00
"github.com/micro/go-micro/codec/protorpc"
2016-12-06 22:40:44 +03:00
"github.com/micro/go-micro/errors"
2019-01-18 15:30:39 +03:00
"github.com/micro/go-micro/registry"
2015-11-20 19:17:33 +03:00
"github.com/micro/go-micro/transport"
)
2016-01-06 00:13:20 +03:00
const (
lastStreamResponseError = "EOS"
)
// serverError represents an error that has been returned from
// the remote side of the RPC connection.
type serverError string
func (e serverError) Error() string {
return string(e)
}
// errShutdown holds the specific error for closing/closed connections
var (
2016-12-06 22:40:44 +03:00
errShutdown = errs.New("connection is shut down")
2016-01-06 00:13:20 +03:00
)
2018-12-31 20:28:19 +03:00
type rpcCodec struct {
client transport.Client
codec codec.Codec
req *transport.Message
2015-10-16 13:15:17 +03:00
buf *readWriteCloser
}
2015-10-16 13:15:17 +03:00
type readWriteCloser struct {
wbuf *bytes.Buffer
rbuf *bytes.Buffer
}
var (
DefaultContentType = "application/protobuf"
DefaultCodecs = map[string]codec.NewCodec{
2019-01-13 22:54:07 +03:00
"application/grpc": grpc.NewCodec,
"application/grpc+json": grpc.NewCodec,
"application/grpc+proto": grpc.NewCodec,
2019-01-01 01:01:16 +03:00
"application/protobuf": proto.NewCodec,
"application/json": json.NewCodec,
2015-11-28 21:54:38 +03:00
"application/json-rpc": jsonrpc.NewCodec,
"application/proto-rpc": protorpc.NewCodec,
"application/octet-stream": raw.NewCodec,
}
2019-01-18 15:30:39 +03:00
// TODO: remove legacy codec list
defaultCodecs = map[string]codec.NewCodec{
"application/json": jsonrpc.NewCodec,
"application/json-rpc": jsonrpc.NewCodec,
"application/protobuf": protorpc.NewCodec,
"application/proto-rpc": protorpc.NewCodec,
"application/octet-stream": protorpc.NewCodec,
}
)
2015-10-16 13:15:17 +03:00
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
}
2019-01-24 13:11:02 +03:00
func getHeaders(m *codec.Message) {
get := func(hdr string) string {
if hd := m.Header[hdr]; len(hd) > 0 {
return hd
}
// old
return m.Header["X-"+hdr]
}
// check error in header
if len(m.Error) == 0 {
m.Error = get("Micro-Error")
}
// check endpoint in header
if len(m.Endpoint) == 0 {
m.Endpoint = get("Micro-Endpoint")
}
// check method in header
if len(m.Method) == 0 {
m.Method = get("Micro-Method")
}
if len(m.Id) == 0 {
m.Id = get("Micro-Id")
}
}
func setHeaders(m *codec.Message) {
set := func(hdr, v string) {
m.Header[hdr] = v
m.Header["X-"+hdr] = v
}
set("Micro-Id", m.Id)
set("Micro-Service", m.Target)
set("Micro-Method", m.Method)
set("Micro-Endpoint", m.Endpoint)
}
2019-01-18 15:30:39 +03:00
// setupProtocol sets up the old protocol
func setupProtocol(msg *transport.Message, node *registry.Node) codec.NewCodec {
protocol := node.Metadata["protocol"]
// got protocol
if len(protocol) > 0 {
return nil
}
// no protocol use old codecs
switch msg.Header["Content-Type"] {
case "application/json":
msg.Header["Content-Type"] = "application/json-rpc"
case "application/protobuf":
msg.Header["Content-Type"] = "application/proto-rpc"
}
// now return codec
return defaultCodecs[msg.Header["Content-Type"]]
}
2019-01-10 14:39:39 +03:00
func newRpcCodec(req *transport.Message, client transport.Client, c codec.NewCodec) codec.Codec {
2015-11-25 22:50:05 +03:00
rwc := &readWriteCloser{
wbuf: bytes.NewBuffer(nil),
rbuf: bytes.NewBuffer(nil),
}
2018-12-31 20:28:19 +03:00
r := &rpcCodec{
2015-11-25 22:50:05 +03:00
buf: rwc,
client: client,
codec: c(rwc),
2015-11-25 22:50:05 +03:00
req: req,
2015-10-16 13:15:17 +03:00
}
return r
}
2019-01-15 00:30:43 +03:00
func (c *rpcCodec) Write(m *codec.Message, body interface{}) error {
c.buf.wbuf.Reset()
2018-12-26 17:46:15 +03:00
2019-01-15 00:30:43 +03:00
// create header
if m.Header == nil {
m.Header = map[string]string{}
}
2019-01-10 14:39:39 +03:00
2019-01-15 00:30:43 +03:00
// copy original header
for k, v := range c.req.Header {
m.Header[k] = v
}
2019-01-10 14:39:39 +03:00
2019-01-15 00:30:43 +03:00
// set the mucp headers
2019-01-24 13:11:02 +03:00
setHeaders(m)
2019-01-15 00:30:43 +03:00
// if body is bytes Frame don't encode
2019-01-15 00:30:43 +03:00
if body != nil {
b, ok := body.(*raw.Frame)
2019-01-15 00:30:43 +03:00
if ok {
// set body
m.Body = b.Data
2019-01-15 00:30:43 +03:00
body = nil
}
2019-01-10 14:39:39 +03:00
}
2019-01-15 00:30:43 +03:00
if len(m.Body) == 0 {
// write to codec
if err := c.codec.Write(m, body); err != nil {
return errors.InternalServerError("go.micro.client.codec", err.Error())
}
// set body
m.Body = c.buf.wbuf.Bytes()
}
// create new transport message
msg := transport.Message{
Header: m.Header,
Body: m.Body,
2015-12-16 04:18:05 +03:00
}
2019-01-10 14:39:39 +03:00
// send the request
2019-01-15 00:30:43 +03:00
if err := c.client.Send(&msg); err != nil {
2016-12-06 22:40:44 +03:00
return errors.InternalServerError("go.micro.client.transport", err.Error())
}
2019-01-15 00:30:43 +03:00
2016-12-06 22:40:44 +03:00
return nil
}
2019-01-24 13:11:02 +03:00
func (c *rpcCodec) ReadHeader(m *codec.Message, r codec.MessageType) error {
var tm transport.Message
// read message from transport
if err := c.client.Recv(&tm); err != nil {
2016-12-06 22:40:44 +03:00
return errors.InternalServerError("go.micro.client.transport", err.Error())
}
2019-01-24 13:11:02 +03:00
2015-10-16 13:15:17 +03:00
c.buf.rbuf.Reset()
2019-01-24 13:11:02 +03:00
c.buf.rbuf.Write(tm.Body)
2018-12-31 20:53:16 +03:00
2019-01-24 13:11:02 +03:00
// set headers from transport
m.Header = tm.Header
2018-12-31 20:53:16 +03:00
// read header
2019-01-24 13:11:02 +03:00
err := c.codec.ReadHeader(m, r)
2019-01-07 12:11:36 +03:00
2019-01-24 13:11:02 +03:00
// get headers
getHeaders(m)
2019-01-07 12:11:36 +03:00
2019-01-10 14:39:39 +03:00
// return header error
2016-12-06 22:40:44 +03:00
if err != nil {
return errors.InternalServerError("go.micro.client.codec", err.Error())
}
2019-01-10 14:39:39 +03:00
return nil
}
func (c *rpcCodec) ReadBody(b interface{}) error {
2018-12-31 20:53:16 +03:00
// read body
2016-12-06 22:40:44 +03:00
if err := c.codec.ReadBody(b); err != nil {
return errors.InternalServerError("go.micro.client.codec", err.Error())
}
return nil
}
2018-12-31 20:28:19 +03:00
func (c *rpcCodec) Close() error {
2015-10-16 13:15:17 +03:00
c.buf.Close()
c.codec.Close()
2016-12-06 22:40:44 +03:00
if err := c.client.Close(); err != nil {
return errors.InternalServerError("go.micro.client.transport", err.Error())
}
return nil
}
2019-01-10 14:39:39 +03:00
func (c *rpcCodec) String() string {
return "rpc"
}