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rpcmultiplex.go
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/
rpcmultiplex.go
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package main
import (
"fmt"
"io"
"errors"
)
type Request struct {
requestChannel chan []byte
responseChannel chan []byte
closeChannel chan bool
}
type RPCHandler interface {
handleRequest(requestChannel chan []byte, responseChannel chan []byte, closeChannel chan bool)
}
type RPCMultiplexer struct {
rw io.ReadWriter
OutstandingRequests []*Request
writeChannel chan []byte
handler RPCHandler
}
func NewRPCMultiplexer(rw io.ReadWriter, handler RPCHandler) *RPCMultiplexer {
return &RPCMultiplexer {
rw: rw,
handler: handler,
}
}
func (m *RPCMultiplexer) writer() {
for {
buffer, ok := <-m.writeChannel
if !ok {
break
}
err := WriteFrame(m.rw, buffer[0], buffer[1:])
if err != nil {
fmt.Println("Couldn't write frame", err)
close(m.writeChannel)
break
}
}
}
func (m *RPCMultiplexer) responseListener(requestId byte, responseChannel chan []byte) {
for {
buffer, ok := <-responseChannel
if !ok {
break
}
m.writeChannel <- addRequestId(requestId, buffer)
}
}
func (m *RPCMultiplexer) closeListener(requestId byte, closeChannel chan bool) {
_ = <-closeChannel
req := m.OutstandingRequests[requestId]
//fmt.Println("Now going to close stuff for", req)
close(req.requestChannel)
close(req.responseChannel)
close(req.closeChannel)
m.OutstandingRequests[requestId] = nil
}
func (m *RPCMultiplexer) Multiplex() error {
m.OutstandingRequests = make([]*Request, 255)
m.writeChannel = make(chan []byte)
go m.writer()
for {
requestId, buffer, err := ReadFrame(m.rw)
if err != nil {
return err
}
if requestId == 0 {
return errors.New(string(buffer))
}
req := m.OutstandingRequests[requestId]
if req == nil {
req = &Request {
requestChannel: make(chan []byte, 10),
responseChannel: make(chan []byte, 10),
closeChannel: make(chan bool),
}
m.OutstandingRequests[requestId] = req
go m.responseListener(requestId, req.responseChannel)
go m.closeListener(requestId, req.closeChannel)
go m.handler.handleRequest(req.requestChannel, req.responseChannel, req.closeChannel)
}
req.requestChannel <- buffer
}
return nil
}