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package privval
import (
"net"
"time"
cmn "github.com/tendermint/tendermint/libs/common"
"github.com/tendermint/tendermint/libs/log"
"github.com/tendermint/tendermint/types"
)
// IPCValOption sets an optional parameter on the SocketPV.
type IPCValOption func(*IPCVal)
// IPCValConnTimeout sets the read and write timeout for connections
// from external signing processes.
func IPCValConnTimeout(timeout time.Duration) IPCValOption {
return func(sc *IPCVal) { sc.connTimeout = timeout }
}
// IPCValHeartbeat sets the period on which to check the liveness of the
// connected Signer connections.
func IPCValHeartbeat(period time.Duration) IPCValOption {
return func(sc *IPCVal) { sc.connHeartbeat = period }
}
// IPCVal implements PrivValidator, it uses a unix socket to request signatures
// from an external process.
type IPCVal struct {
cmn.BaseService
*RemoteSignerClient
addr string
connTimeout time.Duration
connHeartbeat time.Duration
conn net.Conn
cancelPing chan struct{}
pingTicker *time.Ticker
}
// Check that IPCVal implements PrivValidator.
var _ types.PrivValidator = (*IPCVal)(nil)
// NewIPCVal returns an instance of IPCVal.
func NewIPCVal(
logger log.Logger,
socketAddr string,
) *IPCVal {
sc := &IPCVal{
addr: socketAddr,
connTimeout: connTimeout,
connHeartbeat: connHeartbeat,
}
sc.BaseService = *cmn.NewBaseService(logger, "IPCVal", sc)
return sc
}
// OnStart implements cmn.Service.
func (sc *IPCVal) OnStart() error {
err := sc.connect()
if err != nil {
sc.Logger.Error("OnStart", "err", err)
return err
}
sc.RemoteSignerClient = NewRemoteSignerClient(sc.conn)
// Start a routine to keep the connection alive
sc.cancelPing = make(chan struct{}, 1)
sc.pingTicker = time.NewTicker(sc.connHeartbeat)
go func() {
for {
select {
case <-sc.pingTicker.C:
err := sc.Ping()
if err != nil {
sc.Logger.Error("Ping", "err", err)
}
case <-sc.cancelPing:
sc.pingTicker.Stop()
return
}
}
}()
return nil
}
// OnStop implements cmn.Service.
func (sc *IPCVal) OnStop() {
if sc.cancelPing != nil {
close(sc.cancelPing)
}
if sc.conn != nil {
if err := sc.conn.Close(); err != nil {
sc.Logger.Error("OnStop", "err", err)
}
}
}
func (sc *IPCVal) connect() error {
la, err := net.ResolveUnixAddr("unix", sc.addr)
if err != nil {
return err
}
conn, err := net.DialUnix("unix", nil, la)
if err != nil {
return err
}
sc.conn = newTimeoutConn(conn, sc.connTimeout)
return nil
}