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fillcontext.go
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fillcontext.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 fillcontext implements a gRPC middleware that fills global context into a call context.
package fillcontext
import (
"context"
"github.com/grpc-ecosystem/go-grpc-middleware"
"go.thethings.network/lorawan-stack/v3/pkg/fillcontext"
"google.golang.org/grpc"
)
// UnaryServerInterceptor returns a new unary server interceptor that modifies the context.
func UnaryServerInterceptor(fillers ...fillcontext.Filler) grpc.UnaryServerInterceptor {
return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
if fillers != nil {
for _, fill := range fillers {
ctx = fill(ctx)
}
}
return handler(ctx, req)
}
}
// StreamServerInterceptor returns a new streaming server interceptor that that modifies the context.
func StreamServerInterceptor(fillers ...fillcontext.Filler) grpc.StreamServerInterceptor {
return func(srv interface{}, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
if fillers != nil {
ctx := stream.Context()
for _, fill := range fillers {
ctx = fill(ctx)
}
wrapped := grpc_middleware.WrapServerStream(stream)
wrapped.WrappedContext = ctx
return handler(srv, wrapped)
}
return handler(srv, stream)
}
}