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socket_server.go
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socket_server.go
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package server
import (
"bufio"
"context"
"errors"
"fmt"
"io"
"net"
"runtime"
sync "github.com/sasha-s/go-deadlock"
"github.com/dashpay/tenderdash/abci/types"
"github.com/dashpay/tenderdash/libs/log"
tmnet "github.com/dashpay/tenderdash/libs/net"
"github.com/dashpay/tenderdash/libs/service"
)
// var maxNumberConnections = 2
type SocketServer struct {
service.BaseService
logger log.Logger
proto string
addr string
listener net.Listener
connsMtx sync.Mutex
connsClose map[int]func()
nextConnID int
app types.Application
}
func NewSocketServer(logger log.Logger, protoAddr string, app types.Application) service.Service {
proto, addr := tmnet.ProtocolAndAddress(protoAddr)
s := &SocketServer{
logger: logger,
proto: proto,
addr: addr,
listener: nil,
app: app,
connsClose: make(map[int]func()),
}
s.BaseService = *service.NewBaseService(logger, "ABCIServer", s)
return s
}
func (s *SocketServer) OnStart(ctx context.Context) error {
ln, err := net.Listen(s.proto, s.addr)
if err != nil {
return err
}
s.listener = ln
go s.acceptConnectionsRoutine(ctx)
return nil
}
func (s *SocketServer) OnStop() {
if err := s.listener.Close(); err != nil {
s.logger.Error("error closing listener", "err", err)
}
s.connsMtx.Lock()
defer s.connsMtx.Unlock()
for _, closer := range s.connsClose {
closer()
}
}
func (s *SocketServer) addConn(closer func()) int {
s.connsMtx.Lock()
defer s.connsMtx.Unlock()
connID := s.nextConnID
s.nextConnID++
s.connsClose[connID] = closer
return connID
}
// deletes conn even if close errs
func (s *SocketServer) rmConn(connID int) {
s.connsMtx.Lock()
defer s.connsMtx.Unlock()
if closer, ok := s.connsClose[connID]; ok {
closer()
delete(s.connsClose, connID)
}
}
func (s *SocketServer) acceptConnectionsRoutine(ctx context.Context) {
for {
if ctx.Err() != nil {
return
}
// 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", err)
continue
}
cctx, ccancel := context.WithCancel(ctx)
connID := s.addConn(ccancel)
s.logger.Info("Accepted a new connection", "id", connID)
responses := make(chan *types.Response, 1000) // A channel to buffer responses
once := &sync.Once{}
closer := func(err error) {
ccancel()
once.Do(func() {
if cerr := conn.Close(); err != nil {
s.logger.Error("error closing connection",
"id", connID,
"close_err", cerr,
"err", err)
}
s.rmConn(connID)
switch {
case errors.Is(err, context.Canceled):
s.logger.Error("Connection terminated",
"id", connID,
"err", err)
case errors.Is(err, context.DeadlineExceeded):
s.logger.Error("Connection encountered timeout",
"id", connID,
"err", err)
case errors.Is(err, io.EOF):
s.logger.Error("Connection was closed by client",
"id", connID)
case err != nil:
s.logger.Error("Connection error",
"id", connID,
"err", err)
default:
s.logger.Error("Connection was closed",
"id", connID)
}
})
}
// Read requests from conn and deal with them
go s.handleRequests(cctx, closer, conn, responses)
// Pull responses from 'responses' and write them to conn.
go s.handleResponses(cctx, closer, conn, responses)
}
}
// Read requests from conn and deal with them
func (s *SocketServer) handleRequests(ctx context.Context, closer func(error), conn io.Reader, responses chan<- *types.Response) {
var bufReader = bufio.NewReader(conn)
defer func() {
// make sure to recover from any app-related panics to allow proper socket cleanup
if r := recover(); r != nil {
const size = 64 << 10
buf := make([]byte, size)
buf = buf[:runtime.Stack(buf, false)]
closer(fmt.Errorf("recovered from panic: %v\n%s", r, buf))
}
}()
for {
req := &types.Request{}
if err := types.ReadMessage(bufReader, req); err != nil {
closer(fmt.Errorf("error reading message: %w", err))
return
}
resp, err := s.processRequest(ctx, req)
if err != nil {
closer(err)
return
}
select {
case <-ctx.Done():
closer(ctx.Err())
return
case responses <- resp:
}
}
}
func (s *SocketServer) processRequest(ctx context.Context, req *types.Request) (*types.Response, error) {
switch r := req.Value.(type) {
case *types.Request_Echo:
return types.ToResponseEcho(r.Echo.Message), nil
case *types.Request_Flush:
return types.ToResponseFlush(), nil
case *types.Request_Info:
res, err := s.app.Info(ctx, r.Info)
if err != nil {
return nil, err
}
return types.ToResponseInfo(res), nil
case *types.Request_CheckTx:
res, err := s.app.CheckTx(ctx, r.CheckTx)
if err != nil {
return nil, err
}
return types.ToResponseCheckTx(res), nil
case *types.Request_Query:
res, err := s.app.Query(ctx, r.Query)
if err != nil {
return nil, err
}
return types.ToResponseQuery(res), nil
case *types.Request_InitChain:
res, err := s.app.InitChain(ctx, r.InitChain)
if err != nil {
return nil, err
}
return types.ToResponseInitChain(res), nil
case *types.Request_ListSnapshots:
res, err := s.app.ListSnapshots(ctx, r.ListSnapshots)
if err != nil {
return nil, err
}
return types.ToResponseListSnapshots(res), nil
case *types.Request_OfferSnapshot:
res, err := s.app.OfferSnapshot(ctx, r.OfferSnapshot)
if err != nil {
return nil, err
}
return types.ToResponseOfferSnapshot(res), nil
case *types.Request_PrepareProposal:
res, err := s.app.PrepareProposal(ctx, r.PrepareProposal)
if err != nil {
return nil, err
}
return types.ToResponsePrepareProposal(res), nil
case *types.Request_ProcessProposal:
res, err := s.app.ProcessProposal(ctx, r.ProcessProposal)
if err != nil {
return nil, err
}
return types.ToResponseProcessProposal(res), nil
case *types.Request_LoadSnapshotChunk:
res, err := s.app.LoadSnapshotChunk(ctx, r.LoadSnapshotChunk)
if err != nil {
return nil, err
}
return types.ToResponseLoadSnapshotChunk(res), nil
case *types.Request_ApplySnapshotChunk:
res, err := s.app.ApplySnapshotChunk(ctx, r.ApplySnapshotChunk)
if err != nil {
return nil, err
}
return types.ToResponseApplySnapshotChunk(res), nil
case *types.Request_ExtendVote:
res, err := s.app.ExtendVote(ctx, r.ExtendVote)
if err != nil {
return nil, err
}
return types.ToResponseExtendVote(res), nil
case *types.Request_VerifyVoteExtension:
res, err := s.app.VerifyVoteExtension(ctx, r.VerifyVoteExtension)
if err != nil {
return nil, err
}
return types.ToResponseVerifyVoteExtension(res), nil
case *types.Request_FinalizeBlock:
res, err := s.app.FinalizeBlock(ctx, r.FinalizeBlock)
if err != nil {
return nil, err
}
return types.ToResponseFinalizeBlock(res), nil
default:
return types.ToResponseException("Unknown request"), errors.New("unknown request type")
}
}
// Pull responses from 'responses' and write them to conn.
func (s *SocketServer) handleResponses(
ctx context.Context,
closer func(error),
conn io.Writer,
responses <-chan *types.Response,
) {
bw := bufio.NewWriter(conn)
for {
select {
case <-ctx.Done():
closer(ctx.Err())
return
case res := <-responses:
if err := types.WriteMessage(res, bw); err != nil {
closer(fmt.Errorf("error writing message: %w", err))
return
}
if err := bw.Flush(); err != nil {
closer(fmt.Errorf("error writing message: %w", err))
return
}
}
}
}