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