v3 refactor (#1868)
* Move to v3 Co-authored-by: Ben Toogood <bentoogood@gmail.com>
This commit is contained in:
Asim Aslam
GitHub
267
client/mucp/mucp_codec.go
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267
client/mucp/mucp_codec.go
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@@ -0,0 +1,267 @@
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package mucp
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import (
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"bytes"
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errs "errors"
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"github.com/micro/go-micro/v3/codec"
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raw "github.com/micro/go-micro/v3/codec/bytes"
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"github.com/micro/go-micro/v3/codec/grpc"
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"github.com/micro/go-micro/v3/codec/json"
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"github.com/micro/go-micro/v3/codec/jsonrpc"
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"github.com/micro/go-micro/v3/codec/proto"
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"github.com/micro/go-micro/v3/codec/protorpc"
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"github.com/micro/go-micro/v3/errors"
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"github.com/micro/go-micro/v3/registry"
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"github.com/micro/go-micro/v3/transport"
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)
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const (
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lastStreamResponseError = "EOS"
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)
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// serverError represents an error that has been returned from
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// the remote side of the RPC connection.
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type serverError string
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func (e serverError) Error() string {
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return string(e)
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}
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// errShutdown holds the specific error for closing/closed connections
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var (
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errShutdown = errs.New("connection is shut down")
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)
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type rpcCodec struct {
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client transport.Client
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codec codec.Codec
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req *transport.Message
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buf *readWriteCloser
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// signify if its a stream
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stream string
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}
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type readWriteCloser struct {
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wbuf *bytes.Buffer
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rbuf *bytes.Buffer
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}
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var (
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DefaultContentType = "application/protobuf"
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DefaultCodecs = map[string]codec.NewCodec{
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"application/grpc": grpc.NewCodec,
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"application/grpc+json": grpc.NewCodec,
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"application/grpc+proto": grpc.NewCodec,
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"application/protobuf": proto.NewCodec,
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"application/json": json.NewCodec,
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"application/json-rpc": jsonrpc.NewCodec,
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"application/proto-rpc": protorpc.NewCodec,
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"application/octet-stream": raw.NewCodec,
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}
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// TODO: remove legacy codec list
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defaultCodecs = map[string]codec.NewCodec{
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"application/json": jsonrpc.NewCodec,
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"application/json-rpc": jsonrpc.NewCodec,
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"application/protobuf": protorpc.NewCodec,
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"application/proto-rpc": protorpc.NewCodec,
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"application/octet-stream": protorpc.NewCodec,
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}
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)
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func (rwc *readWriteCloser) Read(p []byte) (n int, err error) {
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return rwc.rbuf.Read(p)
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}
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func (rwc *readWriteCloser) Write(p []byte) (n int, err error) {
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return rwc.wbuf.Write(p)
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}
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func (rwc *readWriteCloser) Close() error {
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rwc.rbuf.Reset()
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rwc.wbuf.Reset()
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return nil
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}
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func getHeaders(m *codec.Message) {
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set := func(v, hdr string) string {
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if len(v) > 0 {
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return v
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}
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return m.Header[hdr]
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}
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// check error in header
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m.Error = set(m.Error, "Micro-Error")
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// check endpoint in header
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m.Endpoint = set(m.Endpoint, "Micro-Endpoint")
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// check method in header
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m.Method = set(m.Method, "Micro-Method")
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// set the request id
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m.Id = set(m.Id, "Micro-Id")
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}
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func setHeaders(m *codec.Message, stream string) {
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set := func(hdr, v string) {
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if len(v) == 0 {
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return
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}
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m.Header[hdr] = v
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}
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set("Micro-Id", m.Id)
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set("Micro-Service", m.Target)
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set("Micro-Method", m.Method)
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set("Micro-Endpoint", m.Endpoint)
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set("Micro-Error", m.Error)
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if len(stream) > 0 {
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set("Micro-Stream", stream)
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}
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}
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// setupProtocol sets up the old protocol
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func setupProtocol(msg *transport.Message, node *registry.Node) codec.NewCodec {
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// get the protocol from node metadata
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if protocol := node.Metadata["protocol"]; len(protocol) > 0 {
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return nil
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}
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// processing topic publishing
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if len(msg.Header["Micro-Topic"]) > 0 {
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return nil
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}
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// no protocol use old codecs
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switch msg.Header["Content-Type"] {
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case "application/json":
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msg.Header["Content-Type"] = "application/json-rpc"
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case "application/protobuf":
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msg.Header["Content-Type"] = "application/proto-rpc"
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}
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// now return codec
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return defaultCodecs[msg.Header["Content-Type"]]
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}
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func newRpcCodec(req *transport.Message, client transport.Client, c codec.NewCodec, stream string) codec.Codec {
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rwc := &readWriteCloser{
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wbuf: bytes.NewBuffer(nil),
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rbuf: bytes.NewBuffer(nil),
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}
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r := &rpcCodec{
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buf: rwc,
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client: client,
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codec: c(rwc),
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req: req,
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stream: stream,
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}
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return r
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}
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func (c *rpcCodec) Write(m *codec.Message, body interface{}) error {
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c.buf.wbuf.Reset()
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// create header
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if m.Header == nil {
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m.Header = map[string]string{}
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}
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// copy original header
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for k, v := range c.req.Header {
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m.Header[k] = v
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}
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// set the mucp headers
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setHeaders(m, c.stream)
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// if body is bytes Frame don't encode
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if body != nil {
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if b, ok := body.(*raw.Frame); ok {
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// set body
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m.Body = b.Data
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} else {
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// write to codec
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if err := c.codec.Write(m, body); err != nil {
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return errors.InternalServerError("go.micro.client.codec", err.Error())
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}
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// set body
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m.Body = c.buf.wbuf.Bytes()
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}
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}
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// create new transport message
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msg := transport.Message{
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Header: m.Header,
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Body: m.Body,
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}
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// send the request
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if err := c.client.Send(&msg); err != nil {
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return errors.InternalServerError("go.micro.client.transport", err.Error())
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}
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return nil
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}
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func (c *rpcCodec) ReadHeader(m *codec.Message, r codec.MessageType) error {
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var tm transport.Message
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// read message from transport
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if err := c.client.Recv(&tm); err != nil {
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return errors.InternalServerError("go.micro.client.transport", err.Error())
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}
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c.buf.rbuf.Reset()
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c.buf.rbuf.Write(tm.Body)
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// set headers from transport
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m.Header = tm.Header
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// read header
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err := c.codec.ReadHeader(m, r)
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// get headers
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getHeaders(m)
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// return header error
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if err != nil {
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return errors.InternalServerError("go.micro.client.codec", err.Error())
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}
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return nil
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}
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func (c *rpcCodec) ReadBody(b interface{}) error {
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// read body
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// read raw data
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if v, ok := b.(*raw.Frame); ok {
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v.Data = c.buf.rbuf.Bytes()
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return nil
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}
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if err := c.codec.ReadBody(b); err != nil {
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return errors.InternalServerError("go.micro.client.codec", err.Error())
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}
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return nil
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}
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func (c *rpcCodec) Close() error {
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c.buf.Close()
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c.codec.Close()
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if err := c.client.Close(); err != nil {
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return errors.InternalServerError("go.micro.client.transport", err.Error())
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}
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return nil
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}
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func (c *rpcCodec) String() string {
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return "rpc"
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}
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