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conn.go
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conn.go
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/*
Copyright IBM Corp. 2016 All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package comm
import (
"errors"
"sync"
"sync/atomic"
"github.com/hyperledger/fabric/gossip/common"
"github.com/hyperledger/fabric/gossip/util"
proto "github.com/hyperledger/fabric/protos/gossip"
"github.com/op/go-logging"
"golang.org/x/net/context"
"google.golang.org/grpc"
)
type handler func(message *proto.SignedGossipMessage)
type connFactory interface {
createConnection(endpoint string, pkiID common.PKIidType) (*connection, error)
}
type connectionStore struct {
logger *logging.Logger // logger
isClosing bool // whether this connection store is shutting down
connFactory connFactory // creates a connection to remote peer
sync.RWMutex // synchronize access to shared variables
pki2Conn map[string]*connection // mapping between pkiID to connections
destinationLocks map[string]*sync.RWMutex //mapping between pkiIDs and locks,
// used to prevent concurrent connection establishment to the same remote endpoint
}
func newConnStore(connFactory connFactory, logger *logging.Logger) *connectionStore {
return &connectionStore{
connFactory: connFactory,
isClosing: false,
pki2Conn: make(map[string]*connection),
destinationLocks: make(map[string]*sync.RWMutex),
logger: logger,
}
}
func (cs *connectionStore) getConnection(peer *RemotePeer) (*connection, error) {
cs.RLock()
isClosing := cs.isClosing
cs.RUnlock()
if isClosing {
return nil, errors.New("Shutting down")
}
pkiID := peer.PKIID
endpoint := peer.Endpoint
cs.Lock()
destinationLock, hasConnected := cs.destinationLocks[string(pkiID)]
if !hasConnected {
destinationLock = &sync.RWMutex{}
cs.destinationLocks[string(pkiID)] = destinationLock
}
cs.Unlock()
destinationLock.Lock()
cs.RLock()
conn, exists := cs.pki2Conn[string(pkiID)]
if exists {
cs.RUnlock()
destinationLock.Unlock()
return conn, nil
}
cs.RUnlock()
createdConnection, err := cs.connFactory.createConnection(endpoint, pkiID)
destinationLock.Unlock()
cs.RLock()
isClosing = cs.isClosing
cs.RUnlock()
if isClosing {
return nil, errors.New("ConnStore is closing")
}
cs.Lock()
delete(cs.destinationLocks, string(pkiID))
defer cs.Unlock()
// check again, maybe someone connected to us during the connection creation?
conn, exists = cs.pki2Conn[string(pkiID)]
if exists {
if createdConnection != nil {
createdConnection.close()
}
return conn, nil
}
// no one connected to us AND we failed connecting!
if err != nil {
return nil, err
}
// at this point in the code, we created a connection to a remote peer
conn = createdConnection
cs.pki2Conn[string(createdConnection.pkiID)] = conn
go conn.serviceConnection()
return conn, nil
}
func (cs *connectionStore) connNum() int {
cs.RLock()
defer cs.RUnlock()
return len(cs.pki2Conn)
}
func (cs *connectionStore) closeConn(peer *RemotePeer) {
cs.Lock()
defer cs.Unlock()
if conn, exists := cs.pki2Conn[string(peer.PKIID)]; exists {
conn.close()
delete(cs.pki2Conn, string(conn.pkiID))
}
}
func (cs *connectionStore) shutdown() {
cs.Lock()
cs.isClosing = true
pkiIds2conn := cs.pki2Conn
var connections2Close []*connection
for _, conn := range pkiIds2conn {
connections2Close = append(connections2Close, conn)
}
cs.Unlock()
wg := sync.WaitGroup{}
for _, conn := range connections2Close {
wg.Add(1)
go func(conn *connection) {
cs.closeByPKIid(conn.pkiID)
wg.Done()
}(conn)
}
wg.Wait()
}
func (cs *connectionStore) onConnected(serverStream proto.Gossip_GossipStreamServer, connInfo *proto.ConnectionInfo) *connection {
cs.Lock()
defer cs.Unlock()
if c, exists := cs.pki2Conn[string(connInfo.Identity)]; exists {
c.close()
}
return cs.registerConn(connInfo, serverStream)
}
func (cs *connectionStore) registerConn(connInfo *proto.ConnectionInfo, serverStream proto.Gossip_GossipStreamServer) *connection {
conn := newConnection(nil, nil, nil, serverStream)
conn.pkiID = connInfo.ID
conn.info = connInfo
conn.logger = cs.logger
cs.pki2Conn[string(connInfo.ID)] = conn
return conn
}
func (cs *connectionStore) closeByPKIid(pkiID common.PKIidType) {
cs.Lock()
defer cs.Unlock()
if conn, exists := cs.pki2Conn[string(pkiID)]; exists {
conn.close()
delete(cs.pki2Conn, string(pkiID))
}
}
func newConnection(cl proto.GossipClient, c *grpc.ClientConn, cs proto.Gossip_GossipStreamClient, ss proto.Gossip_GossipStreamServer) *connection {
connection := &connection{
outBuff: make(chan *msgSending, util.GetIntOrDefault("peer.gossip.sendBuffSize", defSendBuffSize)),
cl: cl,
conn: c,
clientStream: cs,
serverStream: ss,
stopFlag: int32(0),
stopChan: make(chan struct{}, 1),
}
return connection
}
type connection struct {
cancel context.CancelFunc
info *proto.ConnectionInfo
outBuff chan *msgSending
logger *logging.Logger // logger
pkiID common.PKIidType // pkiID of the remote endpoint
handler handler // function to invoke upon a message reception
conn *grpc.ClientConn // gRPC connection to remote endpoint
cl proto.GossipClient // gRPC stub of remote endpoint
clientStream proto.Gossip_GossipStreamClient // client-side stream to remote endpoint
serverStream proto.Gossip_GossipStreamServer // server-side stream to remote endpoint
stopFlag int32 // indicates whether this connection is in process of stopping
stopChan chan struct{} // a method to stop the server-side gRPC call from a different go-routine
sync.RWMutex // synchronizes access to shared variables
}
func (conn *connection) close() {
if conn.toDie() {
return
}
amIFirst := atomic.CompareAndSwapInt32(&conn.stopFlag, int32(0), int32(1))
if !amIFirst {
return
}
conn.stopChan <- struct{}{}
conn.Lock()
if conn.clientStream != nil {
conn.clientStream.CloseSend()
}
if conn.conn != nil {
conn.conn.Close()
}
if conn.cancel != nil {
conn.cancel()
}
conn.Unlock()
}
func (conn *connection) toDie() bool {
return atomic.LoadInt32(&(conn.stopFlag)) == int32(1)
}
func (conn *connection) send(msg *proto.SignedGossipMessage, onErr func(error)) {
conn.Lock()
defer conn.Unlock()
if len(conn.outBuff) == util.GetIntOrDefault("peer.gossip.sendBuffSize", defSendBuffSize) {
if conn.logger.IsEnabledFor(logging.DEBUG) {
conn.logger.Debug("Buffer to", conn.info.Endpoint, "overflowed, dropping message", msg.String())
}
return
}
m := &msgSending{
envelope: msg.Envelope,
onErr: onErr,
}
conn.outBuff <- m
}
func (conn *connection) serviceConnection() error {
errChan := make(chan error, 1)
msgChan := make(chan *proto.SignedGossipMessage, util.GetIntOrDefault("peer.gossip.recvBuffSize", defRecvBuffSize))
defer close(msgChan)
// Call stream.Recv() asynchronously in readFromStream(),
// and wait for either the Recv() call to end,
// or a signal to close the connection, which exits
// the method and makes the Recv() call to fail in the
// readFromStream() method
go conn.readFromStream(errChan, msgChan)
go conn.writeToStream()
for !conn.toDie() {
select {
case stop := <-conn.stopChan:
conn.logger.Debug("Closing reading from stream")
conn.stopChan <- stop
return nil
case err := <-errChan:
return err
case msg := <-msgChan:
conn.handler(msg)
}
}
return nil
}
func (conn *connection) writeToStream() {
for !conn.toDie() {
stream := conn.getStream()
if stream == nil {
conn.logger.Error(conn.pkiID, "Stream is nil, aborting!")
return
}
select {
case m := <-conn.outBuff:
err := stream.Send(m.envelope)
if err != nil {
go m.onErr(err)
return
}
case stop := <-conn.stopChan:
conn.logger.Debug("Closing writing to stream")
conn.stopChan <- stop
return
}
}
}
func (conn *connection) readFromStream(errChan chan error, msgChan chan *proto.SignedGossipMessage) {
defer func() {
recover()
}() // msgChan might be closed
for !conn.toDie() {
stream := conn.getStream()
if stream == nil {
conn.logger.Error(conn.pkiID, "Stream is nil, aborting!")
errChan <- errors.New("Stream is nil")
return
}
envelope, err := stream.Recv()
if conn.toDie() {
conn.logger.Debug(conn.pkiID, "canceling read because closing")
return
}
if err != nil {
errChan <- err
conn.logger.Debug(conn.pkiID, "Got error, aborting:", err)
return
}
msg, err := envelope.ToGossipMessage()
if err != nil {
errChan <- err
conn.logger.Warning(conn.pkiID, "Got error, aborting:", err)
}
msgChan <- msg
}
}
func (conn *connection) getStream() stream {
conn.Lock()
defer conn.Unlock()
if conn.clientStream != nil && conn.serverStream != nil {
e := "Both client and server stream are not nil, something went wrong"
conn.logger.Error(e)
}
if conn.clientStream != nil {
return conn.clientStream
}
if conn.serverStream != nil {
return conn.serverStream
}
return nil
}
type msgSending struct {
envelope *proto.Envelope
onErr func(error)
}