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interceptors.go
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interceptors.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package interceptors
import (
"context"
"sync"
"google.golang.org/grpc"
"namespacelabs.dev/foundation/std/go/core"
)
var (
interceptorsMu sync.RWMutex
serverInterceptors struct {
registrations []Registration // Each index of `unary` and `streaming` maps back to the same index `Registration`.
unary []grpc.UnaryServerInterceptor
streaming []grpc.StreamServerInterceptor
}
clientInterceptors struct {
registrations []Registration // Each index of `unary` and `streaming` maps back to the same index `Registration`.
unary []grpc.UnaryClientInterceptor
streaming []grpc.StreamClientInterceptor
}
)
type Registration struct {
owner *core.InstantiationPath
name string
}
func (r Registration) ForClient(u grpc.UnaryClientInterceptor, s grpc.StreamClientInterceptor) {
core.AssertNotRunning("AddServerInterceptor")
interceptorsMu.Lock()
defer interceptorsMu.Unlock()
clientInterceptors.registrations = append(clientInterceptors.registrations, r)
clientInterceptors.unary = append(clientInterceptors.unary, u)
clientInterceptors.streaming = append(clientInterceptors.streaming, s)
}
func (r Registration) ForServer(u grpc.UnaryServerInterceptor, s grpc.StreamServerInterceptor) {
core.AssertNotRunning("AddServerInterceptor")
interceptorsMu.Lock()
defer interceptorsMu.Unlock()
serverInterceptors.registrations = append(serverInterceptors.registrations, r)
serverInterceptors.unary = append(serverInterceptors.unary, u)
serverInterceptors.streaming = append(serverInterceptors.streaming, s)
}
func ServerInterceptors() ([]grpc.UnaryServerInterceptor, []grpc.StreamServerInterceptor) {
interceptorsMu.RLock()
defer interceptorsMu.RUnlock()
unary := serverInterceptors.unary
streaming := serverInterceptors.streaming
return unary, streaming
}
func ClientInterceptors() ([]grpc.UnaryClientInterceptor, []grpc.StreamClientInterceptor) {
interceptorsMu.RLock()
defer interceptorsMu.RUnlock()
unary := clientInterceptors.unary
streaming := clientInterceptors.streaming
return unary, streaming
}
func ProvideInterceptorRegistration(ctx context.Context, r *InterceptorRegistration) (Registration, error) {
return Registration{owner: core.InstantiationPathFromContext(ctx), name: r.GetName()}, nil
}