diff options
Diffstat (limited to 'src/rpc-server/src/trex_rpc_req_resp_server.cpp')
-rw-r--r-- | src/rpc-server/src/trex_rpc_req_resp_server.cpp | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/src/rpc-server/src/trex_rpc_req_resp_server.cpp b/src/rpc-server/src/trex_rpc_req_resp_server.cpp new file mode 100644 index 00000000..e40f5554 --- /dev/null +++ b/src/rpc-server/src/trex_rpc_req_resp_server.cpp @@ -0,0 +1,141 @@ +/* + Itay Marom + Cisco Systems, Inc. +*/ + +/* +Copyright (c) 2015-2015 Cisco Systems, Inc. + +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 <trex_rpc_server_api.h> +#include <trex_rpc_req_resp_server.h> +#include <trex_rpc_jsonrpc_v2_parser.h> + +#include <unistd.h> +#include <sstream> +#include <iostream> + +#include <zmq.h> +#include <json/json.h> + +/** + * ZMQ based request-response server + * + */ +TrexRpcServerReqRes::TrexRpcServerReqRes(const TrexRpcServerConfig &cfg) : TrexRpcServerInterface(cfg) { + /* ZMQ is not thread safe - this should be outside */ + m_context = zmq_ctx_new(); +} + +/** + * main entry point for the server + * this function will be created on a different thread + * + * @author imarom (17-Aug-15) + */ +void TrexRpcServerReqRes::_rpc_thread_cb() { + std::stringstream ss; + + /* create a socket based on the configuration */ + + m_socket = zmq_socket (m_context, ZMQ_REP); + + switch (m_cfg.get_protocol()) { + case TrexRpcServerConfig::RPC_PROT_TCP: + ss << "tcp://*:"; + break; + default: + throw TrexRpcException("unknown protocol for RPC"); + } + + ss << m_cfg.get_port(); + + /* bind the scoket */ + int rc = zmq_bind (m_socket, ss.str().c_str()); + if (rc != 0) { + throw TrexRpcException("Unable to start ZMQ server at: " + ss.str()); + } + + /* server main loop */ + while (m_is_running) { + int msg_size = zmq_recv (m_socket, m_msg_buffer, sizeof(m_msg_buffer), 0); + + /* msg_size of -1 is an error - decode it */ + if (msg_size == -1) { + /* normal shutdown and zmq_term was called */ + if (errno == ETERM) { + break; + } else { + throw TrexRpcException("Unhandled error of zmq_recv"); + } + } + + /* transform it to a string */ + std::string request((const char *)m_msg_buffer, msg_size); + handle_request(request); + } + + /* must be done from the same thread */ + zmq_close(m_socket); +} + +/** + * stops the ZMQ based RPC server + * + */ +void TrexRpcServerReqRes::_stop_rpc_thread() { + /* by calling zmq_term we signal the blocked thread to exit */ + zmq_term(m_context); + +} + +/** + * handles a request given to the server + * respondes to the request + */ +void TrexRpcServerReqRes::handle_request(const std::string &request) { + std::vector<TrexJsonRpcV2ParsedObject *> commands; + Json::FastWriter writer; + Json::Value response; + + /* first parse the request using JSON RPC V2 parser */ + TrexJsonRpcV2Parser rpc_request(request); + rpc_request.parse(commands); + + int index = 0; + + /* for every command parsed - launch it */ + for (auto command : commands) { + Json::Value single_response; + + command->execute(single_response); + delete command; + + response[index++] = single_response; + + } + + /* write the JSON to string and sever on ZMQ */ + std::string reponse_str; + + if (response.size() == 1) { + reponse_str = writer.write(response[0]); + } else { + reponse_str = writer.write(response); + } + + zmq_send(m_socket, reponse_str.c_str(), reponse_str.size(), 0); + +} |