v3 refactor (#1868)
* Move to v3 Co-authored-by: Ben Toogood <bentoogood@gmail.com>
This commit is contained in:
Asim Aslam
GitHub
354
server/mucp/rpc_codec.go
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354
server/mucp/rpc_codec.go
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@@ -0,0 +1,354 @@
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package mucp
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import (
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"bytes"
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"sync"
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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/transport"
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"github.com/oxtoacart/bpool"
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"github.com/pkg/errors"
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)
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type rpcCodec struct {
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socket transport.Socket
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codec codec.Codec
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protocol string
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req *transport.Message
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buf *readWriteCloser
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// check if we're the first
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sync.RWMutex
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first chan bool
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}
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type readWriteCloser struct {
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sync.RWMutex
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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/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,
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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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// the local buffer pool
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bufferPool = bpool.NewSizedBufferPool(32, 1)
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)
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func (rwc *readWriteCloser) Read(p []byte) (n int, err error) {
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rwc.RLock()
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defer rwc.RUnlock()
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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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rwc.Lock()
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defer rwc.Unlock()
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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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return nil
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}
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func getHeader(hdr string, md map[string]string) string {
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if hd := md[hdr]; len(hd) > 0 {
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return hd
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}
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return md["X-"+hdr]
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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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m.Id = set(m.Id, "Micro-Id")
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m.Error = set(m.Error, "Micro-Error")
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m.Endpoint = set(m.Endpoint, "Micro-Endpoint")
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m.Method = set(m.Method, "Micro-Method")
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m.Target = set(m.Target, "Micro-Service")
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// TODO: remove this cruft
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if len(m.Endpoint) == 0 {
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m.Endpoint = m.Method
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}
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}
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func setHeaders(m, r *codec.Message) {
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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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m.Header["X-"+hdr] = v
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}
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// set headers
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set("Micro-Id", r.Id)
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set("Micro-Service", r.Target)
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set("Micro-Method", r.Method)
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set("Micro-Endpoint", r.Endpoint)
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set("Micro-Error", r.Error)
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}
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// setupProtocol sets up the old protocol
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func setupProtocol(msg *transport.Message) codec.NewCodec {
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service := getHeader("Micro-Service", msg.Header)
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method := getHeader("Micro-Method", msg.Header)
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endpoint := getHeader("Micro-Endpoint", msg.Header)
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protocol := getHeader("Micro-Protocol", msg.Header)
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target := getHeader("Micro-Target", msg.Header)
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topic := getHeader("Micro-Topic", msg.Header)
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// if the protocol exists (mucp) do nothing
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if len(protocol) > 0 {
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return nil
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}
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// newer method of processing messages over transport
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if len(topic) > 0 {
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return nil
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}
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// if no service/method/endpoint then it's the old protocol
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if len(service) == 0 && len(method) == 0 && len(endpoint) == 0 {
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return defaultCodecs[msg.Header["Content-Type"]]
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}
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// old target method specified
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if len(target) > 0 {
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return defaultCodecs[msg.Header["Content-Type"]]
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}
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// no method then set to endpoint
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if len(method) == 0 {
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msg.Header["Micro-Method"] = endpoint
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}
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// no endpoint then set to method
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if len(endpoint) == 0 {
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msg.Header["Micro-Endpoint"] = method
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}
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return nil
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}
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func newRpcCodec(req *transport.Message, socket transport.Socket, c codec.NewCodec) codec.Codec {
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rwc := &readWriteCloser{
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rbuf: bufferPool.Get(),
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wbuf: bufferPool.Get(),
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}
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r := &rpcCodec{
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buf: rwc,
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codec: c(rwc),
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req: req,
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socket: socket,
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protocol: "mucp",
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first: make(chan bool),
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}
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// if grpc pre-load the buffer
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// TODO: remove this terrible hack
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switch r.codec.String() {
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case "grpc":
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// write the body
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rwc.rbuf.Write(req.Body)
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// set the protocol
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r.protocol = "grpc"
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default:
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// first is not preloaded
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close(r.first)
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}
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return r
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}
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func (c *rpcCodec) ReadHeader(r *codec.Message, t codec.MessageType) error {
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// the initial message
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m := codec.Message{
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Header: c.req.Header,
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Body: c.req.Body,
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}
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// first message could be pre-loaded
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select {
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case <-c.first:
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// not the first
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var tm transport.Message
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// read off the socket
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if err := c.socket.Recv(&tm); err != nil {
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return err
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}
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// reset the read buffer
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c.buf.rbuf.Reset()
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// write the body to the buffer
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if _, err := c.buf.rbuf.Write(tm.Body); err != nil {
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return err
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}
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// set the message header
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m.Header = tm.Header
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// set the message body
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m.Body = tm.Body
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// set req
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c.req = &tm
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default:
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// we need to lock here to prevent race conditions
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// and we make use of a channel otherwise because
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// this does not result in a context switch
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// locking to check c.first on every call to ReadHeader
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// would otherwise drastically slow the code execution
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c.Lock()
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// recheck before closing because the select statement
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// above is not thread safe, so thread safety here is
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// mandatory
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select {
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case <-c.first:
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default:
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// disable first
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close(c.first)
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}
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// now unlock and we never need this again
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c.Unlock()
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}
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// set some internal things
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getHeaders(&m)
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// read header via codec
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if err := c.codec.ReadHeader(&m, codec.Request); err != nil {
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return err
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}
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// fallback for 0.14 and older
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if len(m.Endpoint) == 0 {
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m.Endpoint = m.Method
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}
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// set message
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*r = m
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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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// don't read empty body
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if len(c.req.Body) == 0 {
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return nil
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}
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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.req.Body
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return nil
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}
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// decode the usual way
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return c.codec.ReadBody(b)
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}
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func (c *rpcCodec) Write(r *codec.Message, b interface{}) error {
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c.buf.wbuf.Reset()
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// create a new message
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m := &codec.Message{
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Target: r.Target,
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Method: r.Method,
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Endpoint: r.Endpoint,
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Id: r.Id,
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Error: r.Error,
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Type: r.Type,
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Header: r.Header,
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}
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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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setHeaders(m, r)
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// the body being sent
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var body []byte
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// is it a raw frame?
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if v, ok := b.(*raw.Frame); ok {
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body = v.Data
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// if we have encoded data just send it
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} else if len(r.Body) > 0 {
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body = r.Body
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// write the body to codec
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} else if err := c.codec.Write(m, b); err != nil {
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c.buf.wbuf.Reset()
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// write an error if it failed
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m.Error = errors.Wrapf(err, "Unable to encode body").Error()
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m.Header["Micro-Error"] = m.Error
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// no body to write
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if err := c.codec.Write(m, nil); err != nil {
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return err
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}
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} else {
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// set the body
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body = c.buf.wbuf.Bytes()
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}
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// Set content type if theres content
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if len(body) > 0 {
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m.Header["Content-Type"] = c.req.Header["Content-Type"]
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}
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// send on the socket
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return c.socket.Send(&transport.Message{
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Header: m.Header,
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Body: body,
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})
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}
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func (c *rpcCodec) Close() error {
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// close the codec
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c.codec.Close()
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// close the socket
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err := c.socket.Close()
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// put back the buffers
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bufferPool.Put(c.buf.rbuf)
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bufferPool.Put(c.buf.wbuf)
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// return the error
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return err
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}
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func (c *rpcCodec) String() string {
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return c.protocol
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}
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