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231 lines
5.7 KiB
231 lines
5.7 KiB
package server
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import (
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"bufio"
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"fmt"
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"io"
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"net"
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"strings"
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"sync"
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"github.com/tendermint/abci/types"
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common "github.com/tendermint/go-common"
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)
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// var maxNumberConnections = 2
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type SocketServer struct {
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common.BaseService
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proto string
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addr string
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listener net.Listener
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connsMtx sync.Mutex
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conns map[int]net.Conn
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nextConnID int
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appMtx sync.Mutex
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app types.Application
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}
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func NewSocketServer(protoAddr string, app types.Application) (common.Service, error) {
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parts := strings.SplitN(protoAddr, "://", 2)
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proto, addr := parts[0], parts[1]
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s := &SocketServer{
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proto: proto,
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addr: addr,
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listener: nil,
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app: app,
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conns: make(map[int]net.Conn),
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}
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s.BaseService = *common.NewBaseService(nil, "ABCIServer", s)
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_, err := s.Start() // Just start it
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return s, err
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}
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func (s *SocketServer) OnStart() error {
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s.BaseService.OnStart()
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ln, err := net.Listen(s.proto, s.addr)
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if err != nil {
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return err
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}
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s.listener = ln
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go s.acceptConnectionsRoutine()
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return nil
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}
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func (s *SocketServer) OnStop() {
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s.BaseService.OnStop()
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s.listener.Close()
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s.connsMtx.Lock()
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for id, conn := range s.conns {
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delete(s.conns, id)
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conn.Close()
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}
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s.connsMtx.Unlock()
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}
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func (s *SocketServer) addConn(conn net.Conn) int {
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s.connsMtx.Lock()
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defer s.connsMtx.Unlock()
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connID := s.nextConnID
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s.nextConnID++
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s.conns[connID] = conn
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return connID
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}
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// deletes conn even if close errs
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func (s *SocketServer) rmConn(connID int, conn net.Conn) error {
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s.connsMtx.Lock()
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defer s.connsMtx.Unlock()
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delete(s.conns, connID)
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return conn.Close()
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}
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func (s *SocketServer) acceptConnectionsRoutine() {
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// semaphore := make(chan struct{}, maxNumberConnections)
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for {
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// semaphore <- struct{}{}
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// Accept a connection
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log.Notice("Waiting for new connection...")
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conn, err := s.listener.Accept()
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if err != nil {
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if !s.IsRunning() {
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return // Ignore error from listener closing.
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}
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log.Crit("Failed to accept connection: " + err.Error())
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} else {
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log.Notice("Accepted a new connection")
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}
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connID := s.addConn(conn)
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closeConn := make(chan error, 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 s.handleRequests(closeConn, conn, responses)
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// Pull responses from 'responses' and write them to conn.
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go s.handleResponses(closeConn, responses, conn)
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go func() {
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// Wait until signal to close connection
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errClose := <-closeConn
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if err == io.EOF {
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log.Warn("Connection was closed by client")
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} else if errClose != nil {
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log.Warn("Connection error", "error", errClose)
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} else {
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// never happens
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log.Warn("Connection was closed.")
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}
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// Close the connection
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err := s.rmConn(connID, conn)
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if err != nil {
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log.Warn("Error in closing connection", "error", err)
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}
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// <-semaphore
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}()
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}
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}
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// Read requests from conn and deal with them
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func (s *SocketServer) handleRequests(closeConn chan error, 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 req = &types.Request{}
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err := types.ReadMessage(bufReader, req)
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if err != nil {
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if err == io.EOF {
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closeConn <- err
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} else {
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closeConn <- fmt.Errorf("Error reading message: %v", err.Error())
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}
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return
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}
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s.appMtx.Lock()
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count++
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s.handleRequest(req, responses)
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s.appMtx.Unlock()
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}
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}
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func (s *SocketServer) handleRequest(req *types.Request, responses chan<- *types.Response) {
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switch r := req.Value.(type) {
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case *types.Request_Echo:
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responses <- types.ToResponseEcho(r.Echo.Message)
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case *types.Request_Flush:
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responses <- types.ToResponseFlush()
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case *types.Request_Info:
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resInfo := s.app.Info()
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responses <- types.ToResponseInfo(resInfo)
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case *types.Request_SetOption:
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so := r.SetOption
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logStr := s.app.SetOption(so.Key, so.Value)
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responses <- types.ToResponseSetOption(logStr)
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case *types.Request_DeliverTx:
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res := s.app.DeliverTx(r.DeliverTx.Tx)
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responses <- types.ToResponseDeliverTx(res.Code, res.Data, res.Log)
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case *types.Request_CheckTx:
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res := s.app.CheckTx(r.CheckTx.Tx)
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responses <- types.ToResponseCheckTx(res.Code, res.Data, res.Log)
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case *types.Request_Commit:
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res := s.app.Commit()
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responses <- types.ToResponseCommit(res.Code, res.Data, res.Log)
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case *types.Request_Query:
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res := s.app.Query(r.Query.Query)
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responses <- types.ToResponseQuery(res.Code, res.Data, res.Log)
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case *types.Request_InitChain:
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if app, ok := s.app.(types.BlockchainAware); ok {
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app.InitChain(r.InitChain.Validators)
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}
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responses <- types.ToResponseInitChain()
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case *types.Request_BeginBlock:
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if app, ok := s.app.(types.BlockchainAware); ok {
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app.BeginBlock(r.BeginBlock.Hash, r.BeginBlock.Header)
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}
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responses <- types.ToResponseBeginBlock()
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case *types.Request_EndBlock:
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if app, ok := s.app.(types.BlockchainAware); ok {
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resEndBlock := app.EndBlock(r.EndBlock.Height)
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responses <- types.ToResponseEndBlock(resEndBlock)
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} else {
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responses <- types.ToResponseEndBlock(types.ResponseEndBlock{})
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}
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default:
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responses <- types.ToResponseException("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 (s *SocketServer) handleResponses(closeConn chan error, 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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err := types.WriteMessage(res, bufWriter)
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if err != nil {
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closeConn <- fmt.Errorf("Error writing message: %v", err.Error())
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return
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}
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if _, ok := res.Value.(*types.Response_Flush); ok {
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err = bufWriter.Flush()
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if err != nil {
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closeConn <- fmt.Errorf("Error flushing write buffer: %v", err.Error())
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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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