open-consul/agent/grpc-external/server.go

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package external
import (
"time"
"github.com/armon/go-metrics"
middleware "github.com/grpc-ecosystem/go-grpc-middleware"
recovery "github.com/grpc-ecosystem/go-grpc-middleware/recovery"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/keepalive"
agentmiddleware "github.com/hashicorp/consul/agent/grpc-middleware"
"github.com/hashicorp/consul/tlsutil"
)
var (
metricsLabels = []metrics.Label{{
Name: "server_type",
Value: "external",
}}
)
// NewServer constructs a gRPC server for the external gRPC port, to which
// handlers can be registered.
func NewServer(logger agentmiddleware.Logger, metricsObj *metrics.Metrics, tls *tlsutil.Configurator) *grpc.Server {
if metricsObj == nil {
metricsObj = metrics.Default()
}
recoveryOpts := agentmiddleware.PanicHandlerMiddlewareOpts(logger)
unaryInterceptors := []grpc.UnaryServerInterceptor{
// Add middlware interceptors to recover in case of panics.
recovery.UnaryServerInterceptor(recoveryOpts...),
}
streamInterceptors := []grpc.StreamServerInterceptor{
// Add middlware interceptors to recover in case of panics.
recovery.StreamServerInterceptor(recoveryOpts...),
agentmiddleware.NewActiveStreamCounter(metricsObj, metricsLabels).Intercept,
}
if tls != nil {
// Attach TLS middleware if TLS is provided.
authInterceptor := agentmiddleware.AuthInterceptor{TLS: tls, Logger: logger}
unaryInterceptors = append(unaryInterceptors, authInterceptor.InterceptUnary)
streamInterceptors = append(streamInterceptors, authInterceptor.InterceptStream)
}
opts := []grpc.ServerOption{
grpc.MaxConcurrentStreams(2048),
grpc.MaxRecvMsgSize(50 * 1024 * 1024),
grpc.StatsHandler(agentmiddleware.NewStatsHandler(metricsObj, metricsLabels)),
middleware.WithUnaryServerChain(unaryInterceptors...),
middleware.WithStreamServerChain(streamInterceptors...),
grpc.KeepaliveEnforcementPolicy(keepalive.EnforcementPolicy{
// This must be less than the keealive.ClientParameters Time setting, otherwise
// the server will disconnect the client for sending too many keepalive pings.
// Currently the client param is set to 30s.
MinTime: 15 * time.Second,
}),
}
if tls != nil {
// Attach TLS credentials, if provided.
tlsCreds := agentmiddleware.NewOptionalTransportCredentials(
credentials.NewTLS(tls.IncomingGRPCConfig()),
logger)
opts = append(opts, grpc.Creds(tlsCreds))
}
return grpc.NewServer(opts...)
}