mirror of https://github.com/grpc/grpc.git
Juanli Shen
6 years ago
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GitHub
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5 changed files with 0 additions and 366 deletions
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#
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# Copyright 2018 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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HOST_SYSTEM = $(shell uname | cut -f 1 -d_)
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SYSTEM ?= $(HOST_SYSTEM)
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CXX = g++
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CPPFLAGS += `pkg-config --cflags protobuf grpc`
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CXXFLAGS += -std=c++11
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ifeq ($(SYSTEM),Darwin) |
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LDFLAGS += -L/usr/local/lib `pkg-config --libs protobuf grpc++ grpc`\
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-lgrpc++_reflection\
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-ldl
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else |
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LDFLAGS += -L/usr/local/lib `pkg-config --libs protobuf grpc++ grpc`\
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-Wl,--no-as-needed -lgrpc++_reflection -Wl,--as-needed\
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-ldl
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endif |
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PROTOC = protoc
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GRPC_CPP_PLUGIN = grpc_cpp_plugin
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GRPC_CPP_PLUGIN_PATH ?= `which $(GRPC_CPP_PLUGIN)`
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PROTOS_PATH = ../../protos
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vpath %.proto $(PROTOS_PATH)
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all: system-check greeter_client greeter_server
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greeter_client: helloworld.pb.o helloworld.grpc.pb.o greeter_client.o
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$(CXX) $^ $(LDFLAGS) -o $@
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greeter_server: helloworld.pb.o helloworld.grpc.pb.o greeter_server.o
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$(CXX) $^ $(LDFLAGS) -o $@
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.PRECIOUS: %.grpc.pb.cc
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%.grpc.pb.cc: %.proto |
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$(PROTOC) -I $(PROTOS_PATH) --grpc_out=. --plugin=protoc-gen-grpc=$(GRPC_CPP_PLUGIN_PATH) $<
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.PRECIOUS: %.pb.cc
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%.pb.cc: %.proto |
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$(PROTOC) -I $(PROTOS_PATH) --cpp_out=. $<
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clean:
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rm -f *.o *.pb.cc *.pb.h greeter_client greeter_server
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# The following is to test your system and ensure a smoother experience.
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# They are by no means necessary to actually compile a grpc-enabled software.
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PROTOC_CMD = which $(PROTOC)
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PROTOC_CHECK_CMD = $(PROTOC) --version | grep -q libprotoc.3
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PLUGIN_CHECK_CMD = which $(GRPC_CPP_PLUGIN)
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HAS_PROTOC = $(shell $(PROTOC_CMD) > /dev/null && echo true || echo false)
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ifeq ($(HAS_PROTOC),true) |
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HAS_VALID_PROTOC = $(shell $(PROTOC_CHECK_CMD) 2> /dev/null && echo true || echo false)
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endif |
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HAS_PLUGIN = $(shell $(PLUGIN_CHECK_CMD) > /dev/null && echo true || echo false)
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SYSTEM_OK = false
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ifeq ($(HAS_VALID_PROTOC),true) |
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ifeq ($(HAS_PLUGIN),true) |
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SYSTEM_OK = true
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endif |
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endif |
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system-check:
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ifneq ($(HAS_VALID_PROTOC),true) |
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@echo " DEPENDENCY ERROR"
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@echo
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@echo "You don't have protoc 3.0.0 installed in your path."
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@echo "Please install Google protocol buffers 3.0.0 and its compiler."
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@echo "You can find it here:"
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@echo
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@echo " https://github.com/google/protobuf/releases/tag/v3.0.0"
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@echo
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@echo "Here is what I get when trying to evaluate your version of protoc:"
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@echo
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-$(PROTOC) --version
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@echo
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@echo
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endif |
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ifneq ($(HAS_PLUGIN),true) |
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@echo " DEPENDENCY ERROR"
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@echo
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@echo "You don't have the grpc c++ protobuf plugin installed in your path."
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@echo "Please install grpc. You can find it here:"
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@echo
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@echo " https://github.com/grpc/grpc"
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@echo
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@echo "Here is what I get when trying to detect if you have the plugin:"
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@echo
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-which $(GRPC_CPP_PLUGIN)
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@echo
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@echo
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endif |
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ifneq ($(SYSTEM_OK),true) |
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@false
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endif |
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@ -1,66 +0,0 @@ |
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# Metadata Example |
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## Overview |
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This example shows you how to add custom headers on the client and server and |
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how to access them. |
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Custom metadata must follow the "Custom-Metadata" format listed in |
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https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md, with the |
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exception of binary headers, which don't have to be base64 encoded. |
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### Get the tutorial source code |
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The example code for this and our other examples lives in the `examples` directory. Clone this repository to your local machine by running the following command: |
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```sh |
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$ git clone -b $(curl -L https://grpc.io/release) https://github.com/grpc/grpc |
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``` |
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Change your current directory to examples/cpp/metadata |
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```sh |
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$ cd examples/cpp/metadata |
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``` |
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### Generating gRPC code |
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To generate the client and server side interfaces: |
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```sh |
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$ make helloworld.grpc.pb.cc helloworld.pb.cc |
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``` |
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Which internally invokes the proto-compiler as: |
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```sh |
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$ protoc -I ../../protos/ --grpc_out=. --plugin=protoc-gen-grpc=grpc_cpp_plugin ../../protos/helloworld.proto |
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$ protoc -I ../../protos/ --cpp_out=. ../../protos/helloworld.proto |
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``` |
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### Try it! |
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Build client and server: |
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```sh |
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$ make |
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``` |
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Run the server, which will listen on port 50051: |
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```sh |
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$ ./greeter_server |
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``` |
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Run the client (in a different terminal): |
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```sh |
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$ ./greeter_client |
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``` |
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If things go smoothly, you will see in the client terminal: |
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"Client received initial metadata from server: initial metadata value" |
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"Client received trailing metadata from server: trailing metadata value" |
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"Client received message: Hello World" |
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And in the server terminal: |
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"Header key: custom-bin , value: 01234567" |
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"Header key: custom-header , value: Custom Value" |
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"Header key: user-agent , value: grpc-c++/1.16.0-dev grpc-c/6.0.0-dev (linux; chttp2; gao)" |
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We did not add the user-agent metadata as a custom header. This shows how |
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the gRPC framework adds some headers under the hood that may show up in the |
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metadata map. |
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@ -1,95 +0,0 @@ |
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/*
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* |
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* Copyright 2015 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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#include <iostream> |
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#include <memory> |
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#include <string> |
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#include <grpcpp/grpcpp.h> |
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#ifdef BAZEL_BUILD |
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#include "examples/protos/helloworld.grpc.pb.h" |
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#else |
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#include "helloworld.grpc.pb.h" |
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#endif |
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using grpc::Channel; |
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using grpc::ClientContext; |
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using grpc::Status; |
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using helloworld::HelloRequest; |
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using helloworld::HelloReply; |
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using helloworld::Greeter; |
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class CustomHeaderClient { |
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public: |
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CustomHeaderClient(std::shared_ptr<Channel> channel) |
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: stub_(Greeter::NewStub(channel)) {} |
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// Assembles the client's payload, sends it and presents the response back
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// from the server.
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std::string SayHello(const std::string& user) { |
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// Data we are sending to the server.
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HelloRequest request; |
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request.set_name(user); |
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// Container for the data we expect from the server.
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HelloReply reply; |
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// Context for the client. It could be used to convey extra information to
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// the server and/or tweak certain RPC behaviors.
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ClientContext context; |
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// Setting custom metadata to be sent to the server
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context.AddMetadata("custom-header", "Custom Value"); |
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// Setting custom binary metadata
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char bytes[8] = {'\0', '\1', '\2', '\3', |
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'\4', '\5', '\6', '\7'}; |
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context.AddMetadata("custom-bin", grpc::string(bytes, 8)); |
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// The actual RPC.
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Status status = stub_->SayHello(&context, request, &reply); |
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// Act upon its status.
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if (status.ok()) { |
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std::cout << "Client received initial metadata from server: " << context.GetServerInitialMetadata().find("custom-server-metadata")->second << std::endl; |
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std::cout << "Client received trailing metadata from server: " << context.GetServerTrailingMetadata().find("custom-trailing-metadata")->second << std::endl; |
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return reply.message(); |
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} else { |
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std::cout << status.error_code() << ": " << status.error_message() |
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<< std::endl; |
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return "RPC failed"; |
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} |
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} |
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private: |
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std::unique_ptr<Greeter::Stub> stub_; |
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}; |
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int main(int argc, char** argv) { |
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// Instantiate the client. It requires a channel, out of which the actual RPCs
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// are created. This channel models a connection to an endpoint (in this case,
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// localhost at port 50051). We indicate that the channel isn't authenticated
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// (use of InsecureChannelCredentials()).
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CustomHeaderClient greeter(grpc::CreateChannel( |
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"localhost:50051", grpc::InsecureChannelCredentials())); |
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std::string user("world"); |
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std::string reply = greeter.SayHello(user); |
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std::cout << "Client received message: " << reply << std::endl; |
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return 0; |
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} |
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@ -1,94 +0,0 @@ |
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/*
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* |
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* Copyright 2015 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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#include <iostream> |
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#include <memory> |
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#include <string> |
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#include <grpcpp/grpcpp.h> |
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#ifdef BAZEL_BUILD |
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#include "examples/protos/helloworld.grpc.pb.h" |
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#else |
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#include "helloworld.grpc.pb.h" |
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#endif |
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using grpc::Server; |
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using grpc::ServerBuilder; |
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using grpc::ServerContext; |
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using grpc::Status; |
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using helloworld::HelloRequest; |
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using helloworld::HelloReply; |
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using helloworld::Greeter; |
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// Logic and data behind the server's behavior.
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class GreeterServiceImpl final : public Greeter::Service { |
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Status SayHello(ServerContext* context, const HelloRequest* request, |
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HelloReply* reply) override { |
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std::string prefix("Hello "); |
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// Get the client's initial metadata
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std::cout << "Client metadata: " << std::endl; |
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const std::multimap<grpc::string_ref, grpc::string_ref> metadata = context->client_metadata(); |
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for (auto iter = metadata.begin(); iter != metadata.end(); ++iter) { |
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std::cout << "Header key: " << iter->first << ", value: "; |
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// Check for binary value
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size_t isbin = iter->first.find("-bin"); |
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if ((isbin != std::string::npos) && (isbin + 4 == iter->first.size())) { |
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std::cout << std::hex; |
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for (auto c : iter->second) { |
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std::cout << static_cast<unsigned int>(c); |
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} |
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std::cout << std::dec; |
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} else { |
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std::cout << iter->second; |
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} |
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std::cout << std::endl; |
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} |
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context->AddInitialMetadata("custom-server-metadata", "initial metadata value"); |
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context->AddTrailingMetadata("custom-trailing-metadata", "trailing metadata value"); |
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reply->set_message(prefix + request->name()); |
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return Status::OK; |
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} |
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}; |
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void RunServer() { |
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std::string server_address("0.0.0.0:50051"); |
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GreeterServiceImpl service; |
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ServerBuilder builder; |
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// Listen on the given address without any authentication mechanism.
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builder.AddListeningPort(server_address, grpc::InsecureServerCredentials()); |
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// Register "service" as the instance through which we'll communicate with
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// clients. In this case it corresponds to an *synchronous* service.
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builder.RegisterService(&service); |
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// Finally assemble the server.
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std::unique_ptr<Server> server(builder.BuildAndStart()); |
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std::cout << "Server listening on " << server_address << std::endl; |
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// Wait for the server to shutdown. Note that some other thread must be
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// responsible for shutting down the server for this call to ever return.
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server->Wait(); |
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} |
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int main(int argc, char** argv) { |
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RunServer(); |
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return 0; |
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} |
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