]>
Commit | Line | Data |
---|---|---|
12471842 PL |
1 | /* |
2 | * This file is part of PowerDNS or dnsdist. | |
3 | * Copyright -- PowerDNS.COM B.V. and its contributors | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of version 2 of the GNU General Public License as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * In addition, for the avoidance of any doubt, permission is granted to | |
10 | * link this program with OpenSSL and to (re)distribute the binaries | |
11 | * produced as the result of such linking. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
21 | */ | |
870a0fe4 AT |
22 | #ifdef HAVE_CONFIG_H |
23 | #include "config.h" | |
24 | #endif | |
a7db8aa6 AT |
25 | #include "remotebackend.hh" |
26 | #ifdef REMOTEBACKEND_ZEROMQ | |
27 | ||
ff05c7e1 O |
28 | ZeroMQConnector::ZeroMQConnector(std::map<std::string, std::string> options) : |
29 | d_ctx(std::unique_ptr<void, int (*)(void*)>(zmq_init(2), zmq_close)), d_sock(std::unique_ptr<void, int (*)(void*)>(zmq_socket(d_ctx.get(), ZMQ_REQ), zmq_close)) | |
30 | { | |
31 | int opt = 0; | |
a7db8aa6 AT |
32 | |
33 | // lookup timeout, target and stuff | |
34 | if (options.count("endpoint") == 0) { | |
ff05c7e1 | 35 | g_log << Logger::Error << "Cannot find 'endpoint' option in connection string" << endl; |
9305f5fd | 36 | throw PDNSException("Cannot find 'endpoint' option in connection string"); |
a7db8aa6 AT |
37 | } |
38 | this->d_endpoint = options.find("endpoint")->second; | |
39 | this->d_options = options; | |
ff05c7e1 | 40 | this->d_timeout = 2000; |
a7db8aa6 AT |
41 | |
42 | if (options.find("timeout") != options.end()) { | |
ff05c7e1 | 43 | this->d_timeout = std::stoi(options.find("timeout")->second); |
a7db8aa6 AT |
44 | } |
45 | ||
6c07f223 | 46 | zmq_setsockopt(d_sock.get(), ZMQ_LINGER, &opt, sizeof(opt)); |
49e4360a | 47 | |
ff05c7e1 O |
48 | if (zmq_connect(this->d_sock.get(), this->d_endpoint.c_str()) < 0) { |
49 | g_log << Logger::Error << "zmq_connect() failed" << zmq_strerror(errno) << std::endl; | |
50 | ; | |
49e4360a AT |
51 | throw PDNSException("Cannot find 'endpoint' option in connection string"); |
52 | } | |
a7db8aa6 | 53 | |
fa2dd0e6 AT |
54 | Json::array parameters; |
55 | Json msg = Json(Json::object{ | |
ff05c7e1 O |
56 | {"method", "initialize"}, |
57 | {"parameters", Json(options)}, | |
fa2dd0e6 | 58 | }); |
a7db8aa6 | 59 | |
fa2dd0e6 AT |
60 | this->send(msg); |
61 | msg = nullptr; | |
645d66cf | 62 | if (!this->recv(msg)) { |
ff05c7e1 | 63 | g_log << Logger::Error << "Failed to initialize zeromq" << std::endl; |
49e4360a | 64 | throw PDNSException("Failed to initialize zeromq"); |
ff05c7e1 | 65 | } |
a7db8aa6 AT |
66 | }; |
67 | ||
645d66cf | 68 | ZeroMQConnector::~ZeroMQConnector() = default; |
a7db8aa6 | 69 | |
ff05c7e1 O |
70 | int ZeroMQConnector::send_message(const Json& input) |
71 | { | |
72 | auto line = input.dump(); | |
73 | zmq_msg_t message; | |
74 | ||
75 | zmq_msg_init_size(&message, line.size() + 1); | |
76 | line.copy(reinterpret_cast<char*>(zmq_msg_data(&message)), line.size()); | |
77 | ((char*)zmq_msg_data(&message))[line.size()] = '\0'; | |
78 | ||
79 | try { | |
80 | zmq_pollitem_t item; | |
81 | item.socket = d_sock.get(); | |
82 | item.events = ZMQ_POLLOUT; | |
83 | // poll until it's sent or timeout is spent. try to leave | |
84 | // leave few cycles for read. just in case. | |
85 | for (d_timespent = 0; d_timespent < d_timeout - 5; d_timespent++) { | |
86 | if (zmq_poll(&item, 1, 1) > 0) { | |
87 | if (zmq_msg_send(&message, this->d_sock.get(), 0) == -1) { | |
88 | // message was not sent | |
89 | g_log << Logger::Error << "Cannot send to " << this->d_endpoint << ": " << zmq_strerror(errno) << std::endl; | |
90 | } | |
645d66cf | 91 | else { |
ff05c7e1 | 92 | return line.size(); |
645d66cf | 93 | } |
ff05c7e1 O |
94 | } |
95 | } | |
96 | } | |
97 | catch (std::exception& ex) { | |
98 | g_log << Logger::Error << "Cannot send to " << this->d_endpoint << ": " << ex.what() << std::endl; | |
99 | throw PDNSException(ex.what()); | |
100 | } | |
101 | ||
102 | return 0; | |
a7db8aa6 AT |
103 | } |
104 | ||
ff05c7e1 O |
105 | int ZeroMQConnector::recv_message(Json& output) |
106 | { | |
107 | int rv = 0; | |
108 | // try to receive message | |
109 | zmq_pollitem_t item; | |
110 | zmq_msg_t message; | |
111 | ||
112 | item.socket = d_sock.get(); | |
113 | item.events = ZMQ_POLLIN; | |
114 | ||
115 | try { | |
116 | // do zmq::poll few times | |
117 | // d_timespent should always be initialized by send_message, recv should never | |
118 | // be called without send first. | |
119 | for (; d_timespent < d_timeout; d_timespent++) { | |
120 | if (zmq_poll(&item, 1, 1) > 0) { | |
121 | // we have an event | |
122 | if ((item.revents & ZMQ_POLLIN) == ZMQ_POLLIN) { | |
123 | string data; | |
645d66cf | 124 | size_t msg_size = 0; |
ff05c7e1 O |
125 | zmq_msg_init(&message); |
126 | // read something | |
127 | if (zmq_msg_recv(&message, this->d_sock.get(), ZMQ_NOBLOCK) > 0) { | |
128 | string err; | |
129 | msg_size = zmq_msg_size(&message); | |
130 | data.assign(reinterpret_cast<const char*>(zmq_msg_data(&message)), msg_size); | |
131 | zmq_msg_close(&message); | |
132 | output = Json::parse(data, err); | |
645d66cf | 133 | if (output != nullptr) { |
ff05c7e1 | 134 | rv = msg_size; |
645d66cf FM |
135 | } |
136 | else { | |
ff05c7e1 | 137 | g_log << Logger::Error << "Cannot parse JSON reply from " << this->d_endpoint << ": " << err << endl; |
645d66cf | 138 | } |
ff05c7e1 O |
139 | break; |
140 | } | |
645d66cf | 141 | if (errno == EAGAIN) { |
ff05c7e1 O |
142 | continue; // try again } |
143 | } | |
645d66cf | 144 | break; |
a7db8aa6 | 145 | } |
ff05c7e1 O |
146 | } |
147 | } | |
148 | } | |
149 | catch (std::exception& ex) { | |
150 | g_log << Logger::Error << "Cannot receive from " << this->d_endpoint << ": " << ex.what() << std::endl; | |
151 | throw PDNSException(ex.what()); | |
152 | } | |
a7db8aa6 | 153 | |
ff05c7e1 | 154 | return rv; |
a7db8aa6 AT |
155 | } |
156 | ||
157 | #endif |