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grpc.go
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grpc.go
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// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package component
import (
"context"
"net"
grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
"go.thethings.network/lorawan-stack/v3/pkg/errors"
"go.thethings.network/lorawan-stack/v3/pkg/metrics"
"go.thethings.network/lorawan-stack/v3/pkg/rpcclient"
"go.thethings.network/lorawan-stack/v3/pkg/rpcmiddleware/hooks"
"go.thethings.network/lorawan-stack/v3/pkg/rpcmiddleware/rpclog"
"go.thethings.network/lorawan-stack/v3/pkg/rpcserver"
"google.golang.org/grpc"
)
func (c *Component) initGRPC() {
if c.grpcLogger == nil {
c.grpcLogger = c.logger.WithField("namespace", "grpc")
}
rpclog.ReplaceGrpcLogger(c.grpcLogger)
c.grpc = rpcserver.New(
c.ctx,
rpcserver.WithContextFiller(c.FillContext),
rpcserver.WithTrustedProxies(c.config.GRPC.TrustedProxies...),
rpcserver.WithLogIgnoreMethods(c.config.GRPC.LogIgnoreMethods),
rpcserver.WithRateLimiter(c.RateLimiter()),
)
}
func (c *Component) setupGRPC() (err error) {
for _, sub := range c.grpcSubsystems {
sub.RegisterServices(c.grpc.Server)
}
metrics.InitializeServerMetrics(c.grpc.Server)
c.logger.Debug("Starting loopback connection")
c.loopback, err = rpcserver.StartLoopback(c.ctx, c.grpc.Server, rpcclient.DefaultDialOptions(c.ctx)...)
if err != nil {
return errors.New("could not start loopback connection").WithCause(err)
}
c.logger.Debug("Setting up gRPC gateway")
for _, sub := range c.grpcSubsystems {
sub.RegisterHandlers(c.grpc.ServeMux, c.loopback)
}
return nil
}
// LoopbackConn returns the loopback gRPC connection to the component.
// This conn must *not* be closed.
func (c *Component) LoopbackConn() *grpc.ClientConn {
return c.loopback
}
func (c *Component) serveGRPC(lis net.Listener) error {
return c.grpc.Serve(lis)
}
func (c *Component) grpcEndpoints() []Endpoint {
return []Endpoint{
NewTCPEndpoint(c.config.GRPC.Listen, "gRPC"),
NewTLSEndpoint(c.config.GRPC.ListenTLS, "gRPC", WithNextProtos("h2", "http/1.1")),
}
}
func (c *Component) listenGRPC() (err error) {
return c.serveOnEndpoints(c.grpcEndpoints(), (*Component).serveGRPC, "grpc")
}
// RegisterGRPC registers a gRPC subsystem to the component.
func (c *Component) RegisterGRPC(s rpcserver.Registerer) {
if c.grpc == nil {
c.initGRPC()
}
c.grpcSubsystems = append(c.grpcSubsystems, s)
}
// WithClusterAuth that can be used to identify a component within a cluster.
func (c *Component) WithClusterAuth() grpc.CallOption {
return c.cluster.Auth()
}
// ClusterAuthUnaryHook ensuring the caller of an RPC is part of the cluster.
// If a call can't be identified as coming from the cluster, it will be discarded.
func (c *Component) ClusterAuthUnaryHook() hooks.UnaryHandlerMiddleware {
return func(next grpc.UnaryHandler) grpc.UnaryHandler {
return func(ctx context.Context, req interface{}) (interface{}, error) {
ctx = c.cluster.WithVerifiedSource(ctx)
return next(ctx, req)
}
}
}
// ClusterAuthStreamHook ensuring the caller of an RPC is part of the cluster.
// If a call can't be identified as coming from the cluster, it will be discarded.
func (c *Component) ClusterAuthStreamHook() hooks.StreamHandlerMiddleware {
return func(hdl grpc.StreamHandler) grpc.StreamHandler {
return func(srv interface{}, stream grpc.ServerStream) error {
wrapped := grpc_middleware.WrapServerStream(stream)
ctx := c.cluster.WithVerifiedSource(stream.Context())
wrapped.WrappedContext = ctx
return hdl(srv, wrapped)
}
}
}