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140 lines
3.7 KiB
140 lines
3.7 KiB
package server
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import (
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"bufio"
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"fmt"
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"net"
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"strings"
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. "github.com/tendermint/go-common"
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"github.com/tendermint/go-wire"
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"github.com/tendermint/tmsp/types"
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)
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func StartListener(protoAddr string, app types.Application) (net.Listener, error) {
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parts := strings.SplitN(protoAddr, "://", 2)
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proto, addr := parts[0], parts[1]
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ln, err := net.Listen(proto, addr)
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if err != nil {
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return nil, err
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}
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// A goroutine to accept a connection.
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go func() {
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for {
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// Accept a connection
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conn, err := ln.Accept()
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if err != nil {
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Exit("Failed to accept connection")
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} else {
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fmt.Println("Accepted a new connection")
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}
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connClosed := make(chan struct{}, 2) // Push to signal connection closed
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responses := make(chan types.Response, 1000) // A channel to buffer responses
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// Read requests from conn and deal with them
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go handleRequests(app, connClosed, conn, responses)
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// Pull responses from 'responses' and write them to conn.
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go handleResponses(connClosed, responses, conn)
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// Wait until connection is closed
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<-connClosed
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fmt.Println("Connection was closed. Waiting for new connection...")
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}
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}()
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return ln, nil
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}
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// Read requests from conn and deal with them
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func handleRequests(app types.Application, connClosed chan struct{}, conn net.Conn, responses chan<- types.Response) {
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var count int
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var bufReader = bufio.NewReader(conn)
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for {
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var n int64
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var err error
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var req types.Request
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wire.ReadBinaryPtr(&req, bufReader, &n, &err)
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if err != nil {
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fmt.Println("Error in handleRequests:", err.Error())
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connClosed <- struct{}{}
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return
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}
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count++
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handleRequest(app, req, responses)
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}
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}
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func handleRequest(app types.Application, req types.Request, responses chan<- types.Response) {
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switch req := req.(type) {
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case types.RequestEcho:
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msg := app.Echo(req.Message)
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responses <- types.ResponseEcho{msg}
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case types.RequestFlush:
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responses <- types.ResponseFlush{}
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case types.RequestInfo:
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data := app.Info()
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responses <- types.ResponseInfo{data}
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case types.RequestAppendTx:
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retCode := app.AppendTx(req.TxBytes)
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responses <- types.ResponseAppendTx{retCode}
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events := app.GetEvents()
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for _, event := range events {
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responses <- types.ResponseEvent{event}
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}
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case types.RequestGetHash:
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hash, retCode := app.GetHash()
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responses <- types.ResponseGetHash{retCode, hash}
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case types.RequestCommit:
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retCode := app.Commit()
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responses <- types.ResponseCommit{retCode}
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case types.RequestRollback:
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retCode := app.Rollback()
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responses <- types.ResponseRollback{retCode}
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case types.RequestSetEventsMode:
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retCode := app.SetEventsMode(req.EventsMode)
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responses <- types.ResponseSetEventsMode{retCode}
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if req.EventsMode == types.EventsModeOn {
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events := app.GetEvents()
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for _, event := range events {
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responses <- types.ResponseEvent{event}
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}
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}
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case types.RequestAddListener:
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retCode := app.AddListener(req.EventKey)
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responses <- types.ResponseAddListener{retCode}
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case types.RequestRemListener:
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retCode := app.RemListener(req.EventKey)
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responses <- types.ResponseRemListener{retCode}
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default:
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responses <- types.ResponseException{"Unknown request"}
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}
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}
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// Pull responses from 'responses' and write them to conn.
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func handleResponses(connClosed chan struct{}, responses <-chan types.Response, conn net.Conn) {
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var count int
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var bufWriter = bufio.NewWriter(conn)
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for {
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var res = <-responses
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var n int64
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var err error
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wire.WriteBinary(res, bufWriter, &n, &err)
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if err != nil {
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fmt.Println(err.Error())
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connClosed <- struct{}{}
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return
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}
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if _, ok := res.(types.ResponseFlush); ok {
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err = bufWriter.Flush()
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if err != nil {
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fmt.Println(err.Error())
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connClosed <- struct{}{}
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return
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}
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}
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count++
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}
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}
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