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interceptors.go
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interceptors.go
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// Copyright 2023 Google LLC
//
// 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 interceptors contains gRPC server interceptors used to track
// the timestamp of the most recent request.
package interceptors
import (
"context"
"sync"
"time"
"google.golang.org/grpc"
)
var (
latestRequestTimestamp = time.Now()
mu sync.Mutex
)
// LatestRequestTimestamp returns the most recent timestamp
// at which a unary / stream RPC was received.
func LatestRequestTimestamp() time.Time {
mu.Lock()
defer mu.Unlock()
return latestRequestTimestamp
}
// UnaryServerInterceptor intercepts unary RPCs and keeps track of the latest request timestamp.
func UnaryServerInterceptor(ctx context.Context, req interface{}, _ *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
mu.Lock()
latestRequestTimestamp = max(latestRequestTimestamp, time.Now())
mu.Unlock()
return handler(ctx, req)
}
// StreamServerInterceptor intercepts stream RPCs and keeps track of the latest request timestamp.
func StreamServerInterceptor(srv interface{}, ss grpc.ServerStream, _ *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
mu.Lock()
latestRequestTimestamp = max(latestRequestTimestamp, time.Now())
mu.Unlock()
return handler(srv, ss)
}
func max(a, b time.Time) time.Time {
if a.Before(b) {
return b
}
return a
}