Class: Iodine::Connection

Inherits:
Data
  • Object
show all
Defined in:
lib/iodine/connection.rb,
ext/iodine/iodine_connection.c

Overview

Iodine's Connection class is the class that TCP/IP, WebSockets and SSE connections inherit from.

Instances of this class are passed to the callback objects. i.e.:

module MyConnectionCallbacks

  # called when the callback object is linked with a new client
  def on_open client
     client.is_a?(Iodine::Connection) # => true
  end

  # called when data is available
  def on_message client, data
     client.is_a?(Iodine::Connection) # => true
  end

  # called when the server is shutting down, before closing the client
  # (it's still possible to send messages to the client)
  def on_shutdown client
     client.is_a?(Iodine::Connection) # => true
  end

  # called when the client is closed (no longer available)
  def on_close client
     client.is_a?(Iodine::Connection) # => true
  end

  # called when all the previous calls to `client.write` have completed
  # (the local buffer was drained and is now empty)
  def on_drained client
     client.is_a?(Iodine::Connection) # => true
  end

  # called when timeout was reached, llowing a `ping` to be sent
  def ping client
     client.is_a?(Iodine::Connection) # => true
     clint.close() # close connection on timeout is the default
  end

  # Allows the module to be used as a static callback object (avoiding object allocation)
  extend self
end

All connection related actions can be performed using the methods provided through this class.

Instance Method Summary collapse

Instance Method Details

#closeObject

Schedules the connection to be closed.

The connection will be closed once all the scheduled write operations have been completed (or failed).


227
228
229
230
231
232
233
234
235
236
237
238
# File 'ext/iodine/iodine_connection.c', line 227

static VALUE iodine_connection_close(VALUE self) {
  iodine_connection_data_s *c = iodine_connection_validate_data(self);
  if (c && !fio_is_closed(c->info.uuid)) {
    if (c->info.type == IODINE_CONNECTION_WEBSOCKET) {
      websocket_close(c->info.arg); /* sends WebSocket close packet */
    } else {
      fio_close(c->info.uuid);
    }
  }

  return Qnil;
}

#envObject

Returns the connection's env (if it originated from an HTTP request).


332
333
334
335
336
337
338
# File 'ext/iodine/iodine_connection.c', line 332

static VALUE iodine_connection_env(VALUE self) {
  iodine_connection_data_s *c = iodine_connection_validate_data(self);
  if (c && c->info.env) {
    return c->info.env;
  }
  return Qnil;
}

#handlerObject

Returns the client's current callback object.


343
344
345
346
347
348
349
350
351
352
# File 'ext/iodine/iodine_connection.c', line 343

static VALUE iodine_connection_handler_get(VALUE self) {
  iodine_connection_data_s *data = iodine_connection_validate_data(self);
  if (!data) {
    FIO_LOG_DEBUG("(iodine) requested connection handler for "
                  "an invalid connection: %p",
                  (void *)self);
    return Qnil;
  }
  return data->info.handler;
}

#handler=(handler) ⇒ Object

Sets the client's callback object, so future events will use the new object's callbacks.


360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
# File 'ext/iodine/iodine_connection.c', line 360

static VALUE iodine_connection_handler_set(VALUE self, VALUE handler) {
  // clang-format on
  iodine_connection_data_s *data = iodine_connection_validate_data(self);
  if (!data) {
    FIO_LOG_DEBUG("(iodine) attempted to set a connection handler for "
                  "an invalid connection: %p",
                  (void *)self);
    return Qnil;
  }
  if (handler == Qnil || handler == Qfalse) {
    FIO_LOG_DEBUG(
        "(iodine) called client.handler = nil, closing connection: %p",
        (void *)self);
    iodine_connection_close(self);
    return Qnil;
  }
  if (data->info.handler != handler) {
    uint8_t answers_on_open = (rb_respond_to(handler, on_open_id) != 0);
    if (data->answers_on_close)
      IodineCaller.call2(data->info.handler, on_close_id, 1, &self);
    fio_lock(&data->lock);
    data->info.handler = handler;
    data->answers_on_open = answers_on_open,
    data->answers_on_message = (rb_respond_to(handler, on_message_id) != 0),
    data->answers_ping = (rb_respond_to(handler, ping_id) != 0),
    data->answers_on_drained = (rb_respond_to(handler, on_drained_id) != 0),
    data->answers_on_shutdown = (rb_respond_to(handler, on_shutdown_id) != 0),
    data->answers_on_close = (rb_respond_to(handler, on_close_id) != 0),
    fio_unlock(&data->lock);
    if (answers_on_open) {
      iodine_connection_fire_event(self, IODINE_CONNECTION_ON_OPEN, Qnil);
    }
    FIO_LOG_DEBUG("(iodine) switched handlers for connection: %p",
                  (void *)self);
  }
  return handler;
}

#open?Boolean

Returns true if the connection appears to be open (no known issues).

Returns:

  • (Boolean)

240
241
242
243
244
245
246
# File 'ext/iodine/iodine_connection.c', line 240

static VALUE iodine_connection_is_open(VALUE self) {
  iodine_connection_data_s *c = iodine_connection_validate_data(self);
  if (c && !fio_is_closed(c->info.uuid)) {
    return Qtrue;
  }
  return Qfalse;
}

#pendingObject

Returns the number of pending write operations that need to complete before the next on_drained callback is called.

Returns -1 if the connection is closed and 0 if on_drained won't be scheduled (no pending write).


262
263
264
265
266
267
268
# File 'ext/iodine/iodine_connection.c', line 262

static VALUE iodine_connection_pending(VALUE self) {
  iodine_connection_data_s *c = iodine_connection_validate_data(self);
  if (!c || fio_is_closed(c->info.uuid)) {
    return INT2NUM(-1);
  }
  return SIZET2NUM((fio_pending(c->info.uuid)));
}

#protocolObject

Returns the connection's protocol Symbol (:sse, :websocket or :raw).


276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
# File 'ext/iodine/iodine_connection.c', line 276

static VALUE iodine_connection_protocol_name(VALUE self) {
  // clang-format on
  iodine_connection_data_s *c = iodine_connection_validate_data(self);
  if (c) {
    switch (c->info.type) {
    case IODINE_CONNECTION_WEBSOCKET:
      return WebSocketSymbol;
      break;
    case IODINE_CONNECTION_SSE:
      return SSESymbol;
      break;
    case IODINE_CONNECTION_RAW: /* fallthrough */
      return RAWSymbol;
      break;
    }
  }
  return Qnil;
}

#publish(*args) ⇒ Object

Publishes a message to a channel.

Can be used using two Strings:

  publish(to, message)

The method accepts an optional engine argument:

  publish(to, message, my_pubsub_engine)

701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
# File 'ext/iodine/iodine_connection.c', line 701

static VALUE iodine_pubsub_publish(int argc, VALUE *argv, VALUE self) {
  // clang-format on
  VALUE rb_ch, rb_msg, rb_engine = Qnil;
  const fio_pubsub_engine_s *engine = NULL;
  switch (argc) {
  case 3:
    /* fallthrough */
    rb_engine = argv[2];
  case 2:
    rb_ch = argv[0];
    rb_msg = argv[1];
    break;
  case 1: {
    /* single argument must be a Hash */
    Check_Type(argv[0], T_HASH);
    rb_ch = rb_hash_aref(argv[0], to_id);
    if (rb_ch == Qnil || rb_ch == Qfalse) {
      rb_ch = rb_hash_aref(argv[0], channel_id);
    }
    rb_msg = rb_hash_aref(argv[0], message_id);
    rb_engine = rb_hash_aref(argv[0], engine_id);
  } break;
  default:
    rb_raise(rb_eArgError, "method accepts 1-3 arguments.");
  }

  if (rb_msg == Qnil || rb_msg == Qfalse) {
    rb_raise(rb_eArgError, "message is required.");
  }
  Check_Type(rb_msg, T_STRING);

  if (rb_ch == Qnil || rb_ch == Qfalse)
    rb_raise(rb_eArgError, "target / channel is required .");
  if (TYPE(rb_ch) == T_SYMBOL)
    rb_ch = rb_sym2str(rb_ch);
  Check_Type(rb_ch, T_STRING);

  if (rb_engine == Qfalse) {
    engine = FIO_PUBSUB_PROCESS;
  } else if (rb_engine != Qnil) {
    // collect engine object
    iodine_pubsub_s *e = iodine_pubsub_CData(rb_engine);
    if (e) {
      engine = e->engine;
    }
  }

  fio_publish(.engine = engine, .channel = IODINE_RSTRINFO(rb_ch),
              .message = IODINE_RSTRINFO(rb_msg));
  return Qtrue;
  (void)self;
}

#pubsub?Boolean

Always returns true, since Iodine connections support the pub/sub extension.

Returns:

  • (Boolean)

251
252
253
254
# File 'ext/iodine/iodine_connection.c', line 251

static VALUE iodine_connection_is_pubsub(VALUE self) {
  return INT2NUM(0);
  (void)self;
}

#subscribe(*args) ⇒ Object

Subscribes to a Pub/Sub stream / channel or replaces an existing subscription.

The method accepts 1-2 arguments and an optional block. These are all valid ways to call the method:

  subscribe("my_stream") {|source, msg| p msg }
  subscribe("my_strea*", match: :redis) {|source, msg| p msg }
  subscribe(to: "my_stream")  {|source, msg| p msg }
  # or use any object that answers `#call(source, msg)`
  MyProc = Proc.new {|source, msg| p msg }
  subscribe to: "my_stream", match: :redis, handler: MyProc

The first argument must be either a String or a Hash.

The second, optional, argument must be a Hash (if given).

The options Hash supports the following possible keys (other keys are ignored, all keys are Symbols):

  • :match - The channel / subject name matching type to be used. Valid value is: :redis. Future versions hope to support :nats and :rabbit patern matching as well.
  • :to - The channel / subject to subscribe to.
  • :as - (only for WebSocket connections) accepts the optional value :binary. default is :text. Note that binary transmissions are illegal for some connections (such as SSE) and an attempted binary subscription will fail for these connections.
  • :handler - Any object that answers .call(source, msg) where source is the stream / channel name.

Note: if an existing subscription with the same name exists, it will be replaced by this new subscription.

Returns the name of the subscription, which matches the name be used in #unsubscribe (or nil on failure).


600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
# File 'ext/iodine/iodine_connection.c', line 600

static VALUE iodine_pubsub_subscribe(int argc, VALUE *argv, VALUE self) {
  // clang-format on
  iodine_sub_args_s args = iodine_subscribe_args(argc, argv);
  if (args.channel == Qnil) {
    return Qnil;
  }
  iodine_connection_data_s *c = NULL;
  if (TYPE(self) == T_MODULE) {
    if (!args.block) {
      rb_raise(rb_eArgError,
               "block or :handler required for local subscriptions.");
    }
  } else {
    c = iodine_connection_validate_data(self);
    if (!c || (c->info.type == IODINE_CONNECTION_SSE && args.binary)) {
      if (args.block) {
        IodineStore.remove(args.block);
      }
      return Qnil; /* cannot subscribe a closed / invalid connection. */
    }
    if (args.block == Qnil) {
      if (c->info.type == IODINE_CONNECTION_WEBSOCKET)
        websocket_optimize4broadcasts((args.binary
                                           ? WEBSOCKET_OPTIMIZE_PUBSUB_BINARY
                                           : WEBSOCKET_OPTIMIZE_PUBSUB),
                                      1);
      if (args.binary) {
        args.block = Qtrue;
      }
    }
    fio_atomic_add(&c->ref, 1);
  }

  subscription_s *sub =
      fio_subscribe(.channel = IODINE_RSTRINFO(args.channel),
                    .on_message = iodine_on_pubsub,
                    .on_unsubscribe = iodine_on_unsubscribe, .udata1 = c,
                    .udata2 = (void *)args.block, .match = args.pattern);
  if (c) {
    fio_lock(&c->lock);
    if (c->info.uuid == -1) {
      fio_unsubscribe(sub);
      fio_unlock(&c->lock);
      return Qnil;
    }
    iodine_sub_add(&c->subscriptions, sub);
    fio_unlock(&c->lock);
  } else {
    fio_lock(&sub_lock);
    iodine_sub_add(&sub_global, sub);
    fio_unlock(&sub_lock);
  }
  return args.channel;
}

#timeoutObject

Returns the timeout / ping interval for the connection.

Returns nil on error.


300
301
302
303
304
305
306
307
# File 'ext/iodine/iodine_connection.c', line 300

static VALUE iodine_connection_timeout_get(VALUE self) {
  iodine_connection_data_s *c = iodine_connection_validate_data(self);
  if (c && !fio_is_closed(c->info.uuid)) {
    size_t tout = (size_t)fio_timeout_get(c->info.uuid);
    return SIZET2NUM(tout);
  }
  return Qnil;
}

#timeout=(timeout) ⇒ Object

Sets the timeout / ping interval for the connection (up to 255 seconds).

Returns nil on error.


314
315
316
317
318
319
320
321
322
323
324
325
326
327
# File 'ext/iodine/iodine_connection.c', line 314

static VALUE iodine_connection_timeout_set(VALUE self, VALUE timeout) {
  Check_Type(timeout, T_FIXNUM);
  int tout = NUM2INT(timeout);
  if (tout < 0 || tout > 255) {
    rb_raise(rb_eRangeError, "timeout out of range.");
    return Qnil;
  }
  iodine_connection_data_s *c = iodine_connection_validate_data(self);
  if (c && !fio_is_closed(c->info.uuid)) {
    fio_timeout_set(c->info.uuid, (uint8_t)tout);
    return timeout;
  }
  return Qnil;
}

#unsubscribe(name) ⇒ Object

Unsubscribes from a Pub/Sub stream / channel.

The method accepts a single arguments, the name used for the subscription. i.e.:

  subscribe("my_stream") {|source, msg| p msg }
  unsubscribe("my_stream")

Returns true if the subscription was found.

Returns false if the subscription didn't exist.


668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
# File 'ext/iodine/iodine_connection.c', line 668

static VALUE iodine_pubsub_unsubscribe(VALUE self, VALUE name) {
  // clang-format on
  iodine_connection_data_s *c = NULL;
  fio_lock_i *s_lock = &sub_lock;
  fio_subhash_s *subs = &sub_global;
  VALUE ret;
  if (TYPE(self) != T_MODULE) {
    c = iodine_connection_validate_data(self);
    if (!c || c->info.uuid == -1) {
      return Qnil; /* cannot unsubscribe a closed connection. */
    }
    s_lock = &c->lock;
    subs = &c->subscriptions;
  }
  fio_lock(s_lock);
  ret = iodine_sub_unsubscribe(subs, IODINE_RSTRINFO(name));
  fio_unlock(s_lock);
  return ret;
}

#write(data) ⇒ Object

Writes data to the connection asynchronously. data MUST be a String.

In effect, the write call does nothing, it only schedules the data to be sent and marks the data as pending.

Use #pending to test how many write operations are pending completion (on_drained(client) will be called when they complete).


170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
# File 'ext/iodine/iodine_connection.c', line 170

static VALUE iodine_connection_write(VALUE self, VALUE data) {
  iodine_connection_data_s *c = iodine_connection_validate_data(self);
  if (!c || fio_is_closed(c->info.uuid)) {
    // don't throw exceptions - closed connections are unavoidable.
    return Qnil;
    // rb_raise(rb_eIOError, "Connection closed or invalid.");
  }
  if (!RB_TYPE_P(data, T_STRING)) {
    VALUE tmp = data;
    data = IodineCaller.call(data, iodine_to_s_id);
    if (!RB_TYPE_P(data, T_STRING))
      Check_Type(tmp, T_STRING);
    rb_backtrace();
    FIO_LOG_WARNING(
        "`Iodine::Connection#write` was called with a non-String object.");
  }

  switch (c->info.type) {
  case IODINE_CONNECTION_WEBSOCKET:
    /* WebSockets*/
    websocket_write(c->info.arg, IODINE_RSTRINFO(data),
                    rb_enc_get(data) == IodineUTF8Encoding);
    return Qtrue;
    break;
  case IODINE_CONNECTION_SSE:
/* SSE */
#if 1
    http_sse_write(c->info.arg, .data = IODINE_RSTRINFO(data));
    return Qtrue;
#else
    if (rb_enc_get(data) == IodineUTF8Encoding) {
      http_sse_write(c->info.arg, .data = {.data = RSTRING_PTR(data),
                                           .len = RSTRING_LEN(data)});
      return Qtrue;
    }
    fprintf(stderr, "WARNING: ignoring an attept to write binary data to "
                    "non-binary protocol (SSE).\n");
    return Qfalse;
// rb_raise(rb_eEncodingError,
//          "This Connection type requires data to be UTF-8 encoded.");
#endif
    break;
  case IODINE_CONNECTION_RAW: /* fallthrough */
  default: {
    fio_write(c->info.uuid, RSTRING_PTR(data), RSTRING_LEN(data));
    return Qtrue;
  } break;
  }
  return Qnil;
}