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/*
A command line tool to talk to any grpc server.
Example of talking to grpc interop server:
1. Prepare request binary file:
a. create a text file input.txt, containing the following:
response_size: 10
payload: {
body: "hello world"
}
b. under grpc/ run
protoc --proto_path=src/proto/grpc/testing/ \
--encode=grpc.testing.SimpleRequest
src/proto/grpc/testing/messages.proto \
< input.txt > input.bin
2. Start a server
make interop_server && bins/opt/interop_server --port=50051
3. Run the tool
make grpc_cli && bins/opt/grpc_cli call localhost:50051 \
/grpc.testing.TestService/UnaryCall --enable_ssl=false \
--input_binary_file=input.bin --output_binary_file=output.bin
4. Decode response
protoc --proto_path=src/proto/grpc/testing/ \
--decode=grpc.testing.SimpleResponse src/proto/grpc/testing/messages.proto \
< output.bin > output.txt
5. Now the text form of response should be in output.txt
Optionally, metadata can be passed to server via flag --metadata, e.g.
--metadata="MyHeaderKey1:Value1:MyHeaderKey2:Value2"
*/
#include <fstream>
#include <iostream>
#include <sstream>
#include <gflags/gflags.h>
#include <grpc/grpc.h>
#include <grpc++/channel.h>
#include <grpc++/create_channel.h>
#include <grpc++/security/credentials.h>
#include <grpc++/support/string_ref.h>
#include "test/cpp/util/cli_call.h"
#include "test/cpp/util/string_ref_helper.h"
#include "test/cpp/util/test_config.h"
DEFINE_bool(enable_ssl, true, "Whether to use ssl/tls.");
DEFINE_bool(use_auth, false, "Whether to create default google credentials.");
DEFINE_string(input_binary_file, "",
"Path to input file containing serialized request.");
DEFINE_string(output_binary_file, "output.bin",
"Path to output file to write serialized response.");
DEFINE_string(metadata, "",
"Metadata to send to server, in the form of key1:val1:key2:val2");
void ParseMetadataFlag(
std::multimap<grpc::string, grpc::string>* client_metadata) {
if (FLAGS_metadata.empty()) {
return;
}
std::vector<grpc::string> fields;
const char* delim = ":";
size_t cur, next = -1;
do {
cur = next + 1;
next = FLAGS_metadata.find_first_of(delim, cur);
fields.push_back(FLAGS_metadata.substr(cur, next - cur));
} while (next != grpc::string::npos);
if (fields.size() % 2) {
std::cout << "Failed to parse metadata flag" << std::endl;
exit(1);
}
for (size_t i = 0; i < fields.size(); i += 2) {
client_metadata->insert(
std::pair<grpc::string, grpc::string>(fields[i], fields[i + 1]));
}
}
template <typename T>
void PrintMetadata(const T& m, const grpc::string& message) {
if (m.empty()) {
return;
}
std::cout << message << std::endl;
grpc::string pair;
for (typename T::const_iterator iter = m.begin(); iter != m.end(); ++iter) {
pair.clear();
pair.append(iter->first.data(), iter->first.size());
pair.append(" : ");
pair.append(iter->second.data(), iter->second.size());
std::cout << pair << std::endl;
}
}
int main(int argc, char** argv) {
grpc::testing::InitTest(&argc, &argv, true);
if (argc < 4 || grpc::string(argv[1]) != "call") {
std::cout << "Usage: grpc_cli call server_host:port full_method_string\n"
<< "Example: grpc_cli call service.googleapis.com "
<< "/grpc.testing.TestService/UnaryCall "
<< "--input_binary_file=input.bin --output_binary_file=output.bin"
<< std::endl;
}
grpc::string server_address(argv[2]);
// TODO(yangg) basic check of method string
grpc::string method(argv[3]);
if (FLAGS_input_binary_file.empty()) {
std::cout << "Missing --input_binary_file for serialized request."
<< std::endl;
return 1;
}
std::cout << "connecting to " << server_address << std::endl;
std::ifstream input_file(FLAGS_input_binary_file,
std::ios::in | std::ios::binary);
std::stringstream input_stream;
input_stream << input_file.rdbuf();
std::shared_ptr<grpc::ChannelCredentials> creds;
if (!FLAGS_enable_ssl) {
creds = grpc::InsecureChannelCredentials();
} else {
if (FLAGS_use_auth) {
creds = grpc::GoogleDefaultCredentials();
} else {
creds = grpc::SslCredentials(grpc::SslCredentialsOptions());
}
}
std::shared_ptr<grpc::Channel> channel =
grpc::CreateChannel(server_address, creds);
grpc::string response;
std::multimap<grpc::string, grpc::string> client_metadata;
std::multimap<grpc::string_ref, grpc::string_ref> server_initial_metadata,
server_trailing_metadata;
ParseMetadataFlag(&client_metadata);
PrintMetadata(client_metadata, "Sending client initial metadata:");
grpc::Status s = grpc::testing::CliCall::Call(
channel, method, input_stream.str(), &response, client_metadata,
&server_initial_metadata, &server_trailing_metadata);
PrintMetadata(server_initial_metadata,
"Received initial metadata from server:");
PrintMetadata(server_trailing_metadata,
"Received trailing metadata from server:");
if (s.ok()) {
std::cout << "Rpc succeeded with OK status" << std::endl;
if (!response.empty()) {
std::ofstream output_file(FLAGS_output_binary_file,
std::ios::trunc | std::ios::binary);
output_file << response;
}
} else {
std::cout << "Rpc failed with status code " << s.error_code()
<< " error message " << s.error_message() << std::endl;
}
return 0;
}