53c405c699
Summary: This diff changes the RPC layer to directly return `TResponse` to the user when issuing a `Call<...>` RPC call. The call throws an exception on failure (instead of the previous return `nullopt`). All servers (network, RPC and distributed) are set to have explicit `Shutdown` methods so that a controlled shutdown can always be performed. The object destructors now have `CHECK`s to enforce that the `AwaitShutdown` methods were called. The distributed memgraph is changed that none of the binaries (master/workers) crash when there is a communication failure. Instead, the whole cluster starts a graceful shutdown when a persistent communication error is detected. Transient errors are allowed during execution. The transaction that errored out will be aborted on the whole cluster. The cluster state is managed using a new Heartbeat RPC call. Reviewers: buda, teon.banek, msantl Reviewed By: teon.banek Subscribers: pullbot Differential Revision: https://phabricator.memgraph.io/D1604
78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
#include <atomic>
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#include <gflags/gflags.h>
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#include <glog/logging.h>
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#include "communication/server.hpp"
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#include "utils/exceptions.hpp"
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DEFINE_string(address, "127.0.0.1", "Server address");
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DEFINE_int32(port, 54321, "Server port");
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DEFINE_string(cert_file, "", "Certificate file to use.");
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DEFINE_string(key_file, "", "Key file to use.");
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DEFINE_string(ca_file, "", "CA file to use.");
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DEFINE_bool(verify_peer, false, "Set to true to verify the peer.");
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struct EchoData {
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std::atomic<bool> alive{true};
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};
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class EchoSession {
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public:
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EchoSession(EchoData *data, const io::network::Endpoint &,
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communication::InputStream *input_stream,
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communication::OutputStream *output_stream)
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: data_(data),
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input_stream_(input_stream),
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output_stream_(output_stream) {}
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void Execute() {
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if (input_stream_->size() < 2) return;
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const uint8_t *data = input_stream_->data();
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uint16_t size = *reinterpret_cast<const uint16_t *>(input_stream_->data());
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input_stream_->Resize(size + 2);
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if (input_stream_->size() < size + 2) return;
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if (size == 0) {
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LOG(INFO) << "Server received EOF message";
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data_->alive.store(false);
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return;
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}
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LOG(INFO) << "Server received '"
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<< std::string(reinterpret_cast<const char *>(data + 2), size)
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<< "'";
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if (!output_stream_->Write(data + 2, size)) {
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throw utils::BasicException("Output stream write failed!");
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}
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input_stream_->Shift(size + 2);
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}
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private:
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EchoData *data_;
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communication::InputStream *input_stream_;
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communication::OutputStream *output_stream_;
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};
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int main(int argc, char **argv) {
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gflags::ParseCommandLineFlags(&argc, &argv, true);
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google::InitGoogleLogging(argv[0]);
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communication::Init();
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// Initialize the server.
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EchoData echo_data;
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io::network::Endpoint endpoint(FLAGS_address, FLAGS_port);
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communication::ServerContext context(FLAGS_key_file, FLAGS_cert_file,
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FLAGS_ca_file, FLAGS_verify_peer);
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communication::Server<EchoSession, EchoData> server(endpoint, &echo_data,
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&context, -1, "SSL", 1);
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while (echo_data.alive) {
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std::this_thread::sleep_for(std::chrono::milliseconds(100));
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}
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server.Shutdown();
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server.AwaitShutdown();
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return 0;
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}
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