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122 lines
3.2 KiB
122 lines
3.2 KiB
package grpc
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import (
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"context"
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"crypto/tls"
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"crypto/x509"
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"io/ioutil"
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"os"
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"time"
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grpc_retry "github.com/grpc-ecosystem/go-grpc-middleware/retry"
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grpc_prometheus "github.com/grpc-ecosystem/go-grpc-prometheus"
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"github.com/tendermint/tendermint/config"
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"github.com/tendermint/tendermint/libs/log"
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tmnet "github.com/tendermint/tendermint/libs/net"
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grpc "google.golang.org/grpc"
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"google.golang.org/grpc/credentials"
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"google.golang.org/grpc/credentials/insecure"
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"google.golang.org/grpc/keepalive"
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)
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// DefaultDialOptions constructs a list of grpc dial options
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func DefaultDialOptions(
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extraOpts ...grpc.DialOption,
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) []grpc.DialOption {
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const (
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retries = 50 // 50 * 100ms = 5s total
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timeout = 1 * time.Second
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maxCallRecvMsgSize = 1 << 20 // Default 5Mb
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)
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var kacp = keepalive.ClientParameters{
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Time: 10 * time.Second, // send pings every 10 seconds if there is no activity
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Timeout: 2 * time.Second, // wait 2 seconds for ping ack before considering the connection dead
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}
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opts := []grpc_retry.CallOption{
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grpc_retry.WithBackoff(grpc_retry.BackoffExponential(timeout)),
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}
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dialOpts := []grpc.DialOption{
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grpc.WithKeepaliveParams(kacp),
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grpc.WithDefaultCallOptions(
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grpc.MaxCallRecvMsgSize(maxCallRecvMsgSize),
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grpc_retry.WithMax(retries),
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),
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grpc.WithUnaryInterceptor(
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grpc_retry.UnaryClientInterceptor(opts...),
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),
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}
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dialOpts = append(dialOpts, extraOpts...)
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return dialOpts
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}
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func GenerateTLS(certPath, keyPath, ca string, log log.Logger) grpc.DialOption {
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certificate, err := tls.LoadX509KeyPair(
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certPath,
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keyPath,
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)
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if err != nil {
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log.Error("error", err)
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os.Exit(1)
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}
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certPool := x509.NewCertPool()
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bs, err := ioutil.ReadFile(ca)
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if err != nil {
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log.Error("failed to read ca cert:", "error", err)
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os.Exit(1)
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}
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ok := certPool.AppendCertsFromPEM(bs)
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if !ok {
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log.Error("failed to append certs")
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os.Exit(1)
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}
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transportCreds := credentials.NewTLS(&tls.Config{
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Certificates: []tls.Certificate{certificate},
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RootCAs: certPool,
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MinVersion: tls.VersionTLS13,
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})
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return grpc.WithTransportCredentials(transportCreds)
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}
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// DialRemoteSigner is a generalized function to dial the gRPC server.
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func DialRemoteSigner(
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cfg *config.PrivValidatorConfig,
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chainID string,
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logger log.Logger,
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usePrometheus bool,
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) (*SignerClient, error) {
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var transportSecurity grpc.DialOption
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if cfg.AreSecurityOptionsPresent() {
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transportSecurity = GenerateTLS(cfg.ClientCertificateFile(),
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cfg.ClientKeyFile(), cfg.RootCAFile(), logger)
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} else {
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transportSecurity = grpc.WithTransportCredentials(insecure.NewCredentials())
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logger.Info("Using an insecure gRPC connection!")
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}
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dialOptions := DefaultDialOptions()
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if usePrometheus {
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grpcMetrics := grpc_prometheus.DefaultClientMetrics
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dialOptions = append(dialOptions, grpc.WithUnaryInterceptor(grpcMetrics.UnaryClientInterceptor()))
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}
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dialOptions = append(dialOptions, transportSecurity)
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ctx := context.Background()
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_, address := tmnet.ProtocolAndAddress(cfg.ListenAddr)
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conn, err := grpc.DialContext(ctx, address, dialOptions...)
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if err != nil {
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logger.Error("unable to connect to server", "target", address, "err", err)
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}
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return NewSignerClient(conn, chainID, logger)
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}
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