socket_base.hpp 10.1 KB
Newer Older
1
/*
2
    Copyright (c) 2007-2015 Contributors as noted in the AUTHORS file
3

4
    This file is part of libzmq, the ZeroMQ core engine in C++.
5

6 7 8
    libzmq is free software; you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License (LGPL) as published
    by the Free Software Foundation; either version 3 of the License, or
9 10
    (at your option) any later version.

11 12 13 14 15 16 17 18 19 20 21 22 23 24
    As a special exception, the Contributors give you permission to link
    this library with independent modules to produce an executable,
    regardless of the license terms of these independent modules, and to
    copy and distribute the resulting executable under terms of your choice,
    provided that you also meet, for each linked independent module, the
    terms and conditions of the license of that module. An independent
    module is a module which is not derived from or based on this library.
    If you modify this library, you must extend this exception to your
    version of the library.

    libzmq is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
    License for more details.
25

26
    You should have received a copy of the GNU Lesser General Public License
27 28 29 30 31 32
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef __ZMQ_SOCKET_BASE_HPP_INCLUDED__
#define __ZMQ_SOCKET_BASE_HPP_INCLUDED__

33
#include <string>
34
#include <map>
35
#include <stdarg.h>
36

37
#include "own.hpp"
38
#include "array.hpp"
39
#include "blob.hpp"
Martin Sustrik's avatar
Martin Sustrik committed
40
#include "stdint.hpp"
41
#include "poller.hpp"
42
#include "atomic_counter.hpp"
43
#include "i_poll_events.hpp"
somdoron's avatar
somdoron committed
44
#include "i_mailbox.hpp"
45
#include "stdint.hpp"
46
#include "clock.hpp"
47
#include "pipe.hpp"
48

49 50 51 52 53
extern "C"
{
    void zmq_free_event (void *data, void *hint);
}

54 55 56
namespace zmq
{

57 58 59 60
    class ctx_t;
    class msg_t;
    class pipe_t;

61
    class socket_base_t :
62
        public own_t,
63
        public array_item_t <>,
64 65
        public i_poll_events,
        public i_pipe_events
66
    {
67 68
        friend class reaper_t;

69 70
    public:

71 72 73
        //  Returns false if object is not a socket.
        bool check_tag ();

74
        //  Create a socket of a specified type.
75
        static socket_base_t *create (int type_, zmq::ctx_t *parent_,
76
            uint32_t tid_, int sid_);
77

78
        //  Returns the mailbox associated with this socket.
somdoron's avatar
somdoron committed
79
        i_mailbox *get_mailbox ();
80 81 82 83

        //  Interrupt blocking call if the socket is stuck in one.
        //  This function can be called from a different thread!
        void stop ();
84

85
        //  Interface for communication with the API layer.
86 87
        int setsockopt (int option_, const void *optval_, size_t optvallen_);
        int getsockopt (int option_, void *optval_, size_t *optvallen_);
88 89
        int bind (const char *addr_);
        int connect (const char *addr_);
90
        int term_endpoint (const char *addr_);
91 92
        int send (zmq::msg_t *msg_, int flags_);
        int recv (zmq::msg_t *msg_, int flags_);
93 94
        int add_signaler (signaler_t *s);
        int remove_signaler (signaler_t *s);
95
        int close ();
96

97 98 99 100 101
        //  These functions are used by the polling mechanism to determine
        //  which events are to be reported from this socket.
        bool has_in ();
        bool has_out ();

102
        //  Using this function reaper thread ask the socket to register with
103 104 105 106 107 108 109 110
        //  its poller.
        void start_reaping (poller_t *poller_);

        //  i_poll_events implementation. This interface is used when socket
        //  is handled by the poller in the reaper thread.
        void in_event ();
        void out_event ();
        void timer_event (int id_);
Martin Sustrik's avatar
Martin Sustrik committed
111

112 113 114
        //  i_pipe_events interface implementation.
        void read_activated (pipe_t *pipe_);
        void write_activated (pipe_t *pipe_);
115
        void hiccuped (pipe_t *pipe_);
116
        void pipe_terminated (pipe_t *pipe_);
skaller's avatar
skaller committed
117 118
        void lock();
        void unlock();
119

120 121
        int monitor (const char *endpoint_, int events_);

122 123 124
        void set_fd(fd_t fd_);
        fd_t fd();

Martin Hurton's avatar
Martin Hurton committed
125 126 127 128 129 130 131 132 133 134
        void event_connected (const std::string &addr_, int fd_);
        void event_connect_delayed (const std::string &addr_, int err_);
        void event_connect_retried (const std::string &addr_, int interval_);
        void event_listening (const std::string &addr_, int fd_);
        void event_bind_failed (const std::string &addr_, int err_);
        void event_accepted (const std::string &addr_, int fd_);
        void event_accept_failed (const std::string &addr_, int err_);
        void event_closed (const std::string &addr_, int fd_);
        void event_close_failed (const std::string &addr_, int fd_);
        void event_disconnected (const std::string &addr_, int fd_);
135

136 137
    protected:

somdoron's avatar
somdoron committed
138
        socket_base_t (zmq::ctx_t *parent_, uint32_t tid_, int sid_, bool thread_safe_ = false);
139 140
        virtual ~socket_base_t ();

141 142
        //  Concrete algorithms for the x- methods are to be defined by
        //  individual socket types.
143
        virtual void xattach_pipe (zmq::pipe_t *pipe_,
144
            bool subscribe_to_all_ = false) = 0;
145

146
        //  The default implementation assumes there are no specific socket
147
        //  options for the particular socket type. If not so, override this
148
        //  method.
149
        virtual int xsetsockopt (int option_, const void *optval_,
150 151 152 153
            size_t optvallen_);

        //  The default implementation assumes that send is not supported.
        virtual bool xhas_out ();
154
        virtual int xsend (zmq::msg_t *msg_);
155 156 157

        //  The default implementation assumes that recv in not supported.
        virtual bool xhas_in ();
158
        virtual int xrecv (zmq::msg_t *msg_);
Martin Sustrik's avatar
Martin Sustrik committed
159

160 161 162 163 164
        //  Returns the credential for the peer from which we have received
        //  the last message. If no message has been received yet,
        //  the function returns empty credential.
        virtual blob_t get_credential () const;

165 166 167
        //  i_pipe_events will be forwarded to these functions.
        virtual void xread_activated (pipe_t *pipe_);
        virtual void xwrite_activated (pipe_t *pipe_);
168
        virtual void xhiccuped (pipe_t *pipe_);
169
        virtual void xpipe_terminated (pipe_t *pipe_) = 0;
170

171 172 173
        //  Delay actual destruction of the socket.
        void process_destroy ();

174
        // Socket event data dispatch
175
        void monitor_event (int event_, int value_, const std::string& addr_);
176

177
        // Monitor socket cleanup
178
        void stop_monitor (bool send_monitor_stopped_event_ = true);
179
        
180
        // Next assigned name on a zmq_connect() call used by ROUTER and STREAM socket types
181 182
        std::string connect_rid;

183
    private:
184
        //  Creates new endpoint ID and adds the endpoint to the map.
185
        void add_endpoint (const char *addr_, own_t *endpoint_, pipe_t *pipe);
186 187

        //  Map of open endpoints.
188 189
        typedef std::pair <own_t *, pipe_t*> endpoint_pipe_t;
        typedef std::multimap <std::string, endpoint_pipe_t> endpoints_t;
190
        endpoints_t endpoints;
191

192 193 194 195
        //  Map of open inproc endpoints.
        typedef std::multimap <std::string, pipe_t *> inprocs_t;
        inprocs_t inprocs;

196 197 198 199
        //  To be called after processing commands or invoking any command
        //  handlers explicitly. If required, it will deallocate the socket.
        void check_destroy ();

200 201 202 203
        //  Moves the flags from the message to local variables,
        //  to be later retrieved by getsockopt.
        void extract_flags (msg_t *msg_);

204 205 206
        //  Used to check whether the object is a socket.
        uint32_t tag;

207 208
        //  If true, associated context was already terminated.
        bool ctx_terminated;
209

210 211 212 213 214
        //  If true, object should have been already destroyed. However,
        //  destruction is delayed while we unwind the stack to the point
        //  where it doesn't intersect the object being destroyed.
        bool destroyed;

215 216 217 218
        //  Parse URI string.
        int parse_uri (const char *uri_, std::string &protocol_,
            std::string &address_);

219 220 221
        //  Check whether transport protocol, as specified in connect or
        //  bind, is available and compatible with the socket type.
        int check_protocol (const std::string &protocol_);
222

223
        //  Register the pipe with this socket.
224
        void attach_pipe (zmq::pipe_t *pipe_, bool subscribe_to_all_ = false);
225

226 227
        //  Processes commands sent to this socket (if any). If timeout is -1,
        //  returns only after at least one command was processed.
228 229
        //  If throttle argument is true, commands are processed at most once
        //  in a predefined time period.
230
        int process_commands (int timeout_, bool throttle_);
231

232
        //  Handlers for incoming commands.
233
        void process_stop ();
234
        void process_bind (zmq::pipe_t *pipe_);
235
        void process_term (int linger_);
236

237 238
        void update_pipe_options(int option_);

239
        //  Socket's mailbox object.
somdoron's avatar
somdoron committed
240
        i_mailbox* mailbox;
241

242 243 244 245
        //  List of attached pipes.
        typedef array_t <pipe_t, 3> pipes_t;
        pipes_t pipes;

246 247 248 249
        //  Reaper's poller and handle of this socket within it.
        poller_t *poller;
        poller_t::handle_t handle;

250
        //  Timestamp of when commands were processed the last time.
Martin Sustrik's avatar
Martin Sustrik committed
251
        uint64_t last_tsc;
252

Martin Sustrik's avatar
Martin Sustrik committed
253 254 255
        //  Number of messages received since last command processing.
        int ticks;

256
        //  True if the last message received had MORE flag set.
257 258
        bool rcvmore;

259 260
        // File descriptor if applicable
        fd_t file_desc;
261

262 263 264
        //  Improves efficiency of time measurement.
        clock_t clock;

265 266 267 268 269 270
        // Monitor socket;
        void *monitor_socket;

        // Bitmask of events being monitored
        int monitor_events;

271 272 273
        // Last socket endpoint resolved URI
        std::string last_endpoint;

somdoron's avatar
somdoron committed
274 275 276 277
        // Indicate if the socket is thread safe
        bool thread_safe;

        // Signaler to be used in the reaping stage
278
        signaler_t* reaper_signaler;
somdoron's avatar
somdoron committed
279 280

        // Mutex for synchronize access to the socket in thread safe mode
skaller's avatar
skaller committed
281
        mutex_t sync;
somdoron's avatar
somdoron committed
282 283 284

        socket_base_t (const socket_base_t&);
        const socket_base_t &operator = (const socket_base_t&);        
285 286 287 288 289
    };

}

#endif
Pieter Hintjens's avatar
Pieter Hintjens committed
290