github.com/openimsdk/tools@v0.0.49/mw/intercept_chain.go (about)

     1  // Copyright © 2023 OpenIM. All rights reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package mw
    16  
    17  import (
    18  	"context"
    19  
    20  	"google.golang.org/grpc"
    21  )
    22  
    23  func InterceptChain(intercepts ...grpc.UnaryServerInterceptor) grpc.UnaryServerInterceptor {
    24  	l := len(intercepts)
    25  	return func(ctx context.Context, req any, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp any, err error) {
    26  		chain := func(currentInter grpc.UnaryServerInterceptor, currentHandler grpc.UnaryHandler) grpc.UnaryHandler {
    27  			return func(currentCtx context.Context, currentReq any) (any, error) {
    28  				return currentInter(
    29  					currentCtx,
    30  					currentReq,
    31  					info,
    32  					currentHandler)
    33  			}
    34  		}
    35  		chainHandler := handler
    36  		for i := l - 1; i >= 0; i-- {
    37  			chainHandler = chain(intercepts[i], chainHandler)
    38  		}
    39  		return chainHandler(ctx, req)
    40  	}
    41  }