You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
237 lines
5.8 KiB
237 lines
5.8 KiB
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++
|
|
}
|
|
}
|