package privval import ( "fmt" "net" "sync" "time" "github.com/pkg/errors" cmn "github.com/tendermint/tendermint/libs/common" ) const ( defaultTimeoutReadWriteSeconds = 3 ) type signerEndpoint struct { cmn.BaseService connMtx sync.Mutex conn net.Conn timeoutReadWrite time.Duration } // Close closes the underlying net.Conn. func (se *signerEndpoint) Close() error { se.DropConnection() return nil } // IsConnected indicates if there is an active connection func (se *signerEndpoint) IsConnected() bool { se.connMtx.Lock() defer se.connMtx.Unlock() return se.isConnected() } // TryGetConnection retrieves a connection if it is already available func (se *signerEndpoint) GetAvailableConnection(connectionAvailableCh chan net.Conn) bool { se.connMtx.Lock() defer se.connMtx.Unlock() // Is there a connection ready? select { case se.conn = <-connectionAvailableCh: return true default: } return false } // TryGetConnection retrieves a connection if it is already available func (se *signerEndpoint) WaitConnection(connectionAvailableCh chan net.Conn, maxWait time.Duration) error { se.connMtx.Lock() defer se.connMtx.Unlock() select { case se.conn = <-connectionAvailableCh: case <-time.After(maxWait): return ErrConnectionTimeout } return nil } // SetConnection replaces the current connection object func (se *signerEndpoint) SetConnection(newConnection net.Conn) { se.connMtx.Lock() defer se.connMtx.Unlock() se.conn = newConnection } // IsConnected indicates if there is an active connection func (se *signerEndpoint) DropConnection() { se.connMtx.Lock() defer se.connMtx.Unlock() se.dropConnection() } // ReadMessage reads a message from the endpoint func (se *signerEndpoint) ReadMessage() (msg SignerMessage, err error) { se.connMtx.Lock() defer se.connMtx.Unlock() if !se.isConnected() { return nil, fmt.Errorf("endpoint is not connected") } // Reset read deadline deadline := time.Now().Add(se.timeoutReadWrite) err = se.conn.SetReadDeadline(deadline) if err != nil { return } const maxRemoteSignerMsgSize = 1024 * 10 _, err = cdc.UnmarshalBinaryLengthPrefixedReader(se.conn, &msg, maxRemoteSignerMsgSize) if _, ok := err.(timeoutError); ok { if err != nil { err = errors.Wrap(ErrReadTimeout, err.Error()) } else { err = errors.Wrap(ErrReadTimeout, "Empty error") } se.Logger.Debug("Dropping [read]", "obj", se) se.dropConnection() } return } // WriteMessage writes a message from the endpoint func (se *signerEndpoint) WriteMessage(msg SignerMessage) (err error) { se.connMtx.Lock() defer se.connMtx.Unlock() if !se.isConnected() { return errors.Wrap(ErrNoConnection, "endpoint is not connected") } // Reset read deadline deadline := time.Now().Add(se.timeoutReadWrite) err = se.conn.SetWriteDeadline(deadline) if err != nil { return } _, err = cdc.MarshalBinaryLengthPrefixedWriter(se.conn, msg) if _, ok := err.(timeoutError); ok { if err != nil { err = errors.Wrap(ErrWriteTimeout, err.Error()) } else { err = errors.Wrap(ErrWriteTimeout, "Empty error") } se.dropConnection() } return } func (se *signerEndpoint) isConnected() bool { return se.conn != nil } func (se *signerEndpoint) dropConnection() { if se.conn != nil { if err := se.conn.Close(); err != nil { se.Logger.Error("signerEndpoint::dropConnection", "err", err) } se.conn = nil } }