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/*
*
* Copyright 2018 gRPC authors.
*
* 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.
*
*/
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <grpcpp/grpcpp.h>
#ifdef BAZEL_BUILD
#include "examples/protos/keyvaluestore.grpc.pb.h"
#else
#include "keyvaluestore.grpc.pb.h"
#endif
using grpc::Channel;
using grpc::ClientContext;
using grpc::Status;
using keyvaluestore::KeyValueStore;
using keyvaluestore::Request;
using keyvaluestore::Response;
class KeyValueStoreClient {
public:
KeyValueStoreClient(std::shared_ptr<Channel> channel)
: stub_(KeyValueStore::NewStub(channel)) {}
// Requests each key in the vector and displays the key and its corresponding
// value as a pair
void GetValues(const std::vector<std::string>& keys) {
// Context for the client. It could be used to convey extra information to
// the server and/or tweak certain RPC behaviors.
ClientContext context;
auto stream = stub_->GetValues(&context);
for (const auto& key : keys) {
// Key we are sending to the server.
Request request;
request.set_key(key);
stream->Write(request);
// Get the value for the sent key
Response response;
stream->Read(&response);
std::cout << key << " : " << response.value() << "\n";
}
stream->WritesDone();
Status status = stream->Finish();
if (!status.ok()) {
std::cout << status.error_code() << ": " << status.error_message()
<< std::endl;
std::cout << "RPC failed";
}
}
private:
std::unique_ptr<KeyValueStore::Stub> stub_;
};
int main(int argc, char** argv) {
// Instantiate the client. It requires a channel, out of which the actual RPCs
// are created. This channel models a connection to an endpoint (in this case,
// localhost at port 50051). We indicate that the channel isn't authenticated
// (use of InsecureChannelCredentials()).
KeyValueStoreClient client(grpc::CreateChannel(
"localhost:50051", grpc::InsecureChannelCredentials()));
std::vector<std::string> keys = {"key1", "key2", "key3", "key4", "key5"};
client.GetValues(keys);
return 0;
}
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