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104 lines
5.3 KiB
Go
104 lines
5.3 KiB
Go
/*
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*
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* Copyright 2016 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package grpc
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import (
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"context"
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)
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// UnaryInvoker is called by UnaryClientInterceptor to complete RPCs.
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type UnaryInvoker func(ctx context.Context, method string, req, reply interface{}, cc *ClientConn, opts ...CallOption) error
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// UnaryClientInterceptor intercepts the execution of a unary RPC on the client.
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// Unary interceptors can be specified as a DialOption, using
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// WithUnaryInterceptor() or WithChainUnaryInterceptor(), when creating a
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// ClientConn. When a unary interceptor(s) is set on a ClientConn, gRPC
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// delegates all unary RPC invocations to the interceptor, and it is the
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// responsibility of the interceptor to call invoker to complete the processing
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// of the RPC.
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//
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// method is the RPC name. req and reply are the corresponding request and
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// response messages. cc is the ClientConn on which the RPC was invoked. invoker
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// is the handler to complete the RPC and it is the responsibility of the
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// interceptor to call it. opts contain all applicable call options, including
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// defaults from the ClientConn as well as per-call options.
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//
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// The returned error must be compatible with the status package.
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type UnaryClientInterceptor func(ctx context.Context, method string, req, reply interface{}, cc *ClientConn, invoker UnaryInvoker, opts ...CallOption) error
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// Streamer is called by StreamClientInterceptor to create a ClientStream.
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type Streamer func(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, opts ...CallOption) (ClientStream, error)
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// StreamClientInterceptor intercepts the creation of a ClientStream. Stream
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// interceptors can be specified as a DialOption, using WithStreamInterceptor()
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// or WithChainStreamInterceptor(), when creating a ClientConn. When a stream
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// interceptor(s) is set on the ClientConn, gRPC delegates all stream creations
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// to the interceptor, and it is the responsibility of the interceptor to call
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// streamer.
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//
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// desc contains a description of the stream. cc is the ClientConn on which the
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// RPC was invoked. streamer is the handler to create a ClientStream and it is
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// the responsibility of the interceptor to call it. opts contain all applicable
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// call options, including defaults from the ClientConn as well as per-call
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// options.
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//
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// StreamClientInterceptor may return a custom ClientStream to intercept all I/O
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// operations. The returned error must be compatible with the status package.
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type StreamClientInterceptor func(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, streamer Streamer, opts ...CallOption) (ClientStream, error)
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// UnaryServerInfo consists of various information about a unary RPC on
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// server side. All per-rpc information may be mutated by the interceptor.
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type UnaryServerInfo struct {
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// Server is the service implementation the user provides. This is read-only.
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Server interface{}
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// FullMethod is the full RPC method string, i.e., /package.service/method.
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FullMethod string
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}
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// UnaryHandler defines the handler invoked by UnaryServerInterceptor to complete the normal
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// execution of a unary RPC.
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//
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// If a UnaryHandler returns an error, it should either be produced by the
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// status package, or be one of the context errors. Otherwise, gRPC will use
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// codes.Unknown as the status code and err.Error() as the status message of the
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// RPC.
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type UnaryHandler func(ctx context.Context, req interface{}) (interface{}, error)
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// UnaryServerInterceptor provides a hook to intercept the execution of a unary RPC on the server. info
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// contains all the information of this RPC the interceptor can operate on. And handler is the wrapper
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// of the service method implementation. It is the responsibility of the interceptor to invoke handler
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// to complete the RPC.
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type UnaryServerInterceptor func(ctx context.Context, req interface{}, info *UnaryServerInfo, handler UnaryHandler) (resp interface{}, err error)
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// StreamServerInfo consists of various information about a streaming RPC on
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// server side. All per-rpc information may be mutated by the interceptor.
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type StreamServerInfo struct {
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// FullMethod is the full RPC method string, i.e., /package.service/method.
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FullMethod string
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// IsClientStream indicates whether the RPC is a client streaming RPC.
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IsClientStream bool
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// IsServerStream indicates whether the RPC is a server streaming RPC.
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IsServerStream bool
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}
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// StreamServerInterceptor provides a hook to intercept the execution of a streaming RPC on the server.
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// info contains all the information of this RPC the interceptor can operate on. And handler is the
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// service method implementation. It is the responsibility of the interceptor to invoke handler to
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// complete the RPC.
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type StreamServerInterceptor func(srv interface{}, ss ServerStream, info *StreamServerInfo, handler StreamHandler) error
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