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131 lines
3.0 KiB
131 lines
3.0 KiB
package privval
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import (
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"io"
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"net"
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"time"
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cmn "github.com/tendermint/tendermint/libs/common"
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"github.com/tendermint/tendermint/libs/log"
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"github.com/tendermint/tendermint/types"
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)
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// IPCRemoteSignerOption sets an optional parameter on the IPCRemoteSigner.
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type IPCRemoteSignerOption func(*IPCRemoteSigner)
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// IPCRemoteSignerConnDeadline sets the read and write deadline for connections
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// from external signing processes.
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func IPCRemoteSignerConnDeadline(deadline time.Duration) IPCRemoteSignerOption {
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return func(ss *IPCRemoteSigner) { ss.connDeadline = deadline }
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}
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// IPCRemoteSignerConnRetries sets the amount of attempted retries to connect.
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func IPCRemoteSignerConnRetries(retries int) IPCRemoteSignerOption {
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return func(ss *IPCRemoteSigner) { ss.connRetries = retries }
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}
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// IPCRemoteSigner is a RPC implementation of PrivValidator that listens on a unix socket.
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type IPCRemoteSigner struct {
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cmn.BaseService
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addr string
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chainID string
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connDeadline time.Duration
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connRetries int
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privVal types.PrivValidator
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listener *net.UnixListener
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}
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// NewIPCRemoteSigner returns an instance of IPCRemoteSigner.
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func NewIPCRemoteSigner(
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logger log.Logger,
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chainID, socketAddr string,
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privVal types.PrivValidator,
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) *IPCRemoteSigner {
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rs := &IPCRemoteSigner{
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addr: socketAddr,
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chainID: chainID,
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connDeadline: time.Second * defaultConnDeadlineSeconds,
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connRetries: defaultDialRetries,
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privVal: privVal,
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}
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rs.BaseService = *cmn.NewBaseService(logger, "IPCRemoteSigner", rs)
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return rs
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}
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// OnStart implements cmn.Service.
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func (rs *IPCRemoteSigner) OnStart() error {
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err := rs.listen()
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if err != nil {
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err = cmn.ErrorWrap(err, "listen")
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rs.Logger.Error("OnStart", "err", err)
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return err
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}
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go func() {
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for {
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conn, err := rs.listener.AcceptUnix()
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if err != nil {
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return
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}
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go rs.handleConnection(conn)
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}
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}()
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return nil
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}
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// OnStop implements cmn.Service.
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func (rs *IPCRemoteSigner) OnStop() {
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if rs.listener != nil {
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if err := rs.listener.Close(); err != nil {
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rs.Logger.Error("OnStop", "err", cmn.ErrorWrap(err, "closing listener failed"))
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}
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}
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}
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func (rs *IPCRemoteSigner) listen() error {
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la, err := net.ResolveUnixAddr("unix", rs.addr)
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if err != nil {
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return err
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}
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rs.listener, err = net.ListenUnix("unix", la)
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return err
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}
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func (rs *IPCRemoteSigner) handleConnection(conn net.Conn) {
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for {
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if !rs.IsRunning() {
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return // Ignore error from listener closing.
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}
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// Reset the connection deadline
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conn.SetDeadline(time.Now().Add(rs.connDeadline))
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req, err := readMsg(conn)
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if err != nil {
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if err != io.EOF {
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rs.Logger.Error("handleConnection", "err", err)
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}
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return
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}
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res, err := handleRequest(req, rs.chainID, rs.privVal)
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if err != nil {
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// only log the error; we'll reply with an error in res
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rs.Logger.Error("handleConnection", "err", err)
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}
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err = writeMsg(conn, res)
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if err != nil {
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rs.Logger.Error("handleConnection", "err", err)
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return
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}
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}
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}
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