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package server
import (
"bufio"
"fmt"
"io"
"net"
"sync"
"github.com/tendermint/tendermint/abci/types"
cmn "github.com/tendermint/tendermint/libs/common"
)
// var maxNumberConnections = 2
type SocketServer struct {
cmn.BaseService
proto string
addr string
listener net.Listener
connsMtx sync.Mutex
conns map[int]net.Conn
nextConnID int
appMtx sync.Mutex
app types.Application
}
func NewSocketServer(protoAddr string, app types.Application) cmn.Service {
proto, addr := cmn.ProtocolAndAddress(protoAddr)
s := &SocketServer{
proto: proto,
addr: addr,
listener: nil,
app: app,
conns: make(map[int]net.Conn),
}
s.BaseService = *cmn.NewBaseService(nil, "ABCIServer", s)
return s
}
func (s *SocketServer) OnStart() error {
if err := s.BaseService.OnStart(); err != nil {
return err
}
ln, err := net.Listen(s.proto, s.addr)
if err != nil {
return err
}
s.listener = ln
go s.acceptConnectionsRoutine()
return nil
}
func (s *SocketServer) OnStop() {
s.BaseService.OnStop()
if err := s.listener.Close(); err != nil {
s.Logger.Error("Error closing listener", "err", err)
}
s.connsMtx.Lock()
defer s.connsMtx.Unlock()
for id, conn := range s.conns {
delete(s.conns, id)
if err := conn.Close(); err != nil {
s.Logger.Error("Error closing connection", "id", id, "conn", conn, "err", err)
}
}
}
func (s *SocketServer) addConn(conn net.Conn) int {
s.connsMtx.Lock()
defer s.connsMtx.Unlock()
connID := s.nextConnID
s.nextConnID++
s.conns[connID] = conn
return connID
}
// deletes conn even if close errs
func (s *SocketServer) rmConn(connID int) error {
s.connsMtx.Lock()
defer s.connsMtx.Unlock()
conn, ok := s.conns[connID]
if !ok {
return fmt.Errorf("connection %d does not exist", connID)
}
delete(s.conns, connID)
return conn.Close()
}
func (s *SocketServer) acceptConnectionsRoutine() {
for {
// Accept a connection
s.Logger.Info("Waiting for new connection...")
conn, err := s.listener.Accept()
if err != nil {
if !s.IsRunning() {
return // Ignore error from listener closing.
}
s.Logger.Error("Failed to accept connection: " + err.Error())
continue
}
s.Logger.Info("Accepted a new connection")
connID := s.addConn(conn)
closeConn := make(chan error, 2) // Push to signal connection closed
responses := make(chan *types.Response, 1000) // A channel to buffer responses
// Read requests from conn and deal with them
go s.handleRequests(closeConn, conn, responses)
// Pull responses from 'responses' and write them to conn.
go s.handleResponses(closeConn, conn, responses)
// Wait until signal to close connection
go s.waitForClose(closeConn, connID)
}
}
func (s *SocketServer) waitForClose(closeConn chan error, connID int) {
err := <-closeConn
switch {
case err == io.EOF:
s.Logger.Error("Connection was closed by client")
case err != nil:
s.Logger.Error("Connection error", "error", err)
default:
// never happens
s.Logger.Error("Connection was closed.")
}
// Close the connection
if err := s.rmConn(connID); err != nil {
s.Logger.Error("Error in closing connection", "error", err)
}
}
// Read requests from conn and deal with them
func (s *SocketServer) handleRequests(closeConn chan error, conn io.Reader, responses chan<- *types.Response) {
var count int
var bufReader = bufio.NewReader(conn)
defer func() {
// make sure to recover from any app-related panics to allow proper socket cleanup
r := recover()
if r != nil {
closeConn <- fmt.Errorf("recovered from panic: %v", r)
s.appMtx.Unlock()
}
}()
for {
var req = &types.Request{}
err := types.ReadMessage(bufReader, req)
if err != nil {
if err == io.EOF {
closeConn <- err
} else {
closeConn <- fmt.Errorf("error reading message: %v", err)
}
return
}
s.appMtx.Lock()
count++
s.handleRequest(req, responses)
s.appMtx.Unlock()
}
}
func (s *SocketServer) handleRequest(req *types.Request, responses chan<- *types.Response) {
switch r := req.Value.(type) {
case *types.Request_Echo:
responses <- types.ToResponseEcho(r.Echo.Message)
case *types.Request_Flush:
responses <- types.ToResponseFlush()
case *types.Request_Info:
res := s.app.Info(*r.Info)
responses <- types.ToResponseInfo(res)
case *types.Request_SetOption:
res := s.app.SetOption(*r.SetOption)
responses <- types.ToResponseSetOption(res)
case *types.Request_DeliverTx:
res := s.app.DeliverTx(*r.DeliverTx)
responses <- types.ToResponseDeliverTx(res)
case *types.Request_CheckTx:
res := s.app.CheckTx(*r.CheckTx)
responses <- types.ToResponseCheckTx(res)
case *types.Request_Commit:
res := s.app.Commit()
responses <- types.ToResponseCommit(res)
case *types.Request_Query:
res := s.app.Query(*r.Query)
responses <- types.ToResponseQuery(res)
case *types.Request_InitChain:
res := s.app.InitChain(*r.InitChain)
responses <- types.ToResponseInitChain(res)
case *types.Request_BeginBlock:
res := s.app.BeginBlock(*r.BeginBlock)
responses <- types.ToResponseBeginBlock(res)
case *types.Request_EndBlock:
res := s.app.EndBlock(*r.EndBlock)
responses <- types.ToResponseEndBlock(res)
default:
responses <- types.ToResponseException("Unknown request")
}
}
// Pull responses from 'responses' and write them to conn.
func (s *SocketServer) handleResponses(closeConn chan error, conn io.Writer, responses <-chan *types.Response) {
var count int
var bufWriter = bufio.NewWriter(conn)
for {
var res = <-responses
err := types.WriteMessage(res, bufWriter)
if err != nil {
closeConn <- fmt.Errorf("error writing message: %v", err.Error())
return
}
if _, ok := res.Value.(*types.Response_Flush); ok {
err = bufWriter.Flush()
if err != nil {
closeConn <- fmt.Errorf("error flushing write buffer: %v", err.Error())
return
}
}
count++
}
}