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package server
import (
"bufio"
"fmt"
"io"
"net"
"strings"
"sync"
"github.com/tendermint/abci/types"
cmn "github.com/tendermint/tmlibs/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 {
parts := strings.SplitN(protoAddr, "://", 2)
proto, addr := parts[0], parts[1]
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 {
s.BaseService.OnStart()
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()
s.listener.Close()
s.connsMtx.Lock()
for id, conn := range s.conns {
delete(s.conns, id)
conn.Close()
}
s.connsMtx.Unlock()
}
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, conn net.Conn) error {
s.connsMtx.Lock()
defer s.connsMtx.Unlock()
delete(s.conns, connID)
return conn.Close()
}
func (s *SocketServer) acceptConnectionsRoutine() {
// semaphore := make(chan struct{}, maxNumberConnections)
for {
// semaphore <- struct{}{}
// 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())
} else {
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, responses, conn)
go func() {
// Wait until signal to close connection
errClose := <-closeConn
if err == io.EOF {
s.Logger.Error("Connection was closed by client")
} else if errClose != nil {
s.Logger.Error("Connection error", "error", errClose)
} else {
// never happens
s.Logger.Error("Connection was closed.")
}
// Close the connection
err := s.rmConn(connID, conn)
if err != nil {
s.Logger.Error("Error in closing connection", "error", err)
}
// <-semaphore
}()
}
}
// Read requests from conn and deal with them
func (s *SocketServer) handleRequests(closeConn chan error, conn net.Conn, responses chan<- *types.Response) {
var count int
var bufReader = bufio.NewReader(conn)
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.Error())
}
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:
resInfo := s.app.Info()
responses <- types.ToResponseInfo(resInfo)
case *types.Request_SetOption:
so := r.SetOption
logStr := s.app.SetOption(so.Key, so.Value)
responses <- types.ToResponseSetOption(logStr)
case *types.Request_DeliverTx:
res := s.app.DeliverTx(r.DeliverTx.Tx)
responses <- types.ToResponseDeliverTx(res.Code, res.Data, res.Log)
case *types.Request_CheckTx:
res := s.app.CheckTx(r.CheckTx.Tx)
responses <- types.ToResponseCheckTx(res.Code, res.Data, res.Log)
case *types.Request_Commit:
res := s.app.Commit()
responses <- types.ToResponseCommit(res.Code, res.Data, res.Log)
case *types.Request_Query:
resQuery := s.app.Query(*r.Query)
responses <- types.ToResponseQuery(resQuery)
case *types.Request_InitChain:
s.app.InitChain(r.InitChain.Validators)
responses <- types.ToResponseInitChain()
case *types.Request_BeginBlock:
s.app.BeginBlock(r.BeginBlock.Hash, r.BeginBlock.Header)
responses <- types.ToResponseBeginBlock()
case *types.Request_EndBlock:
resEndBlock := s.app.EndBlock(r.EndBlock.Height)
responses <- types.ToResponseEndBlock(resEndBlock)
default:
responses <- types.ToResponseException("Unknown request")
}
}
// Pull responses from 'responses' and write them to conn.
func (s *SocketServer) handleResponses(closeConn chan error, responses <-chan *types.Response, conn net.Conn) {
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++
}
}