Module: Iodine

Defined in:
lib/iodine.rb,
lib/iodine/json.rb,
lib/iodine/pubsub.rb,
lib/iodine/version.rb,
lib/iodine/connection.rb,
lib/iodine/rack_utils.rb,
lib/rack/handler/iodine.rb,
ext/iodine/iodine.c

Overview

Iodine is an HTTP / WebSocket server as well as an Evented Network Tool Library.

Here is a simple telnet based echo server using Iodine (see full list at Connection):

require 'iodine'
# define the protocol for our service
module EchoProtocol
  def on_open(client)
    # Set a connection timeout
    client.timeout = 10
    # Write a welcome message
    client.write "Echo server running on Iodine #{Iodine::VERSION}.\r\n"
  end
  # this is called for incoming data - note data might be fragmented.
  def on_message(client, data)
    # write the data we received
    client.write "echo: #{data}"
    # close the connection when the time comes
    client.close if data =~ /^bye[\n\r]/
  end
  # called if the connection is still open and the server is shutting down.
  def on_shutdown(client)
    # write the data we received
    client.write "Server going away\r\n"
  end
  extend self
end
# create the service instance, the block returns a connection handler.
Iodine.listen(port: "3000") { EchoProtocol }
# start the service
Iodine.threads = 1
Iodine.start

Methods for setting up and starting Iodine include Iodine.start, Iodine.threads, Iodine.threads=, Iodine.workers and Iodine.workers=.

Methods for setting startup / operational callbacks include Iodine.on_idle, Iodine.on_shutdown, Iodine.before_fork and Iodine.after_fork.

Methods for asynchronous execution include Iodine.run (same as Iodine.defer), Iodine.run_after and Iodine.run_every.

Methods for application wide pub/sub include Iodine.subscribe, Iodine.unsubscribe and Iodine.publish. Connection specific pub/sub methods are documented in the Connection class).

Methods for TCP/IP and Unix Sockets connections include Iodine.listen and Iodine.connect.

Methods for HTTP connections include Iodine.listen2http.

Note that the HTTP server supports both TCP/IP and Unix Sockets as well as SSE / WebSockets extensions.

Iodine doesn't call Iodine.patch_rack automatically, but doing so will improve Rack's performace.

Please read the README file for an introduction to Iodine.

Defined Under Namespace

Modules: Base, JSON, PubSub, Rack Classes: Connection

Constant Summary collapse

VERSION =
'0.6.5'.freeze

Class Method Summary collapse

Class Method Details

.after_forkObject

Sets a block of code to run after a new worker process is forked (cluster mode only).



308
309
310
311
312
313
314
315
316
317
# File 'ext/iodine/iodine_defer.c', line 308

VALUE iodine_after_fork_add(VALUE self) {
  rb_need_block();
  VALUE block = rb_block_proc();
  IodineStore.add(block);
  spn_lock(&iodine_after_fork_lock);
  fio_ls_push(&iodine_after_fork_list, (void *)block);
  spn_unlock(&iodine_after_fork_lock);
  return block;
  (void)self;
}

.attach_fd(fd, handler) ⇒ Object

The attach_fd method instructs iodine to attach a socket to the server using it's numerical file descriptor.

This is faster than attaching a Ruby IO object since it allows iodine to directly call the system's read/write methods. However, this doesn't support TLS/SSL connections.

This method requires two objects, a file descriptor (`fd`) and a callback object.

See listen for details about the callback object.

Returns the callback object (handler) used.



314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
# File 'ext/iodine/iodine_tcp.c', line 314

static VALUE iodine_tcp_attach_fd(VALUE self, VALUE fd, VALUE handler) {
  // clang-format on
  Check_Type(fd, T_FIXNUM);
  if (handler == Qnil || handler == Qfalse || handler == Qtrue) {
    rb_raise(rb_eArgError, "A callback object must be provided.");
  }
  IodineStore.add(handler);
  int other = dup(NUM2INT(fd));
  if (other == -1) {
    rb_raise(rb_eIOError, "invalid fd.");
  }
  intptr_t uuid = sock_open(other);
  iodine_tcp_attch_uuid(uuid, handler);
  IodineStore.remove(handler);
  return handler;
  (void)self;
}

.before_forkObject

Sets a block of code to run before a new worker process is forked (cluster mode only).



293
294
295
296
297
298
299
300
301
302
# File 'ext/iodine/iodine_defer.c', line 293

VALUE iodine_before_fork_add(VALUE self) {
  rb_need_block();
  VALUE block = rb_block_proc();
  IodineStore.add(block);
  spn_lock(&iodine_before_fork_lock);
  fio_ls_push(&iodine_before_fork_list, (void *)block);
  spn_unlock(&iodine_before_fork_lock);
  return block;
  (void)self;
}

.connect(args) ⇒ Object

The connect method instructs iodine to connect to a server using either TCP/IP or Unix sockets.

The method accepts a single Hash argument with the following optional keys:

:port

The port to listen to, deafults to 0 (using a Unix socket)

:address

The address to listen to, which could be a Unix Socket path as well as an IPv4 / IPv6 address. Deafults to 0.0.0.0 (or the IPv6 equivelant).

:handler

A connection callback object that supports the following same callbacks listen in the listen method's documentation.

:timeout

An integer timeout for connection establishment (doen't effect the new connection's timeout. Should be in the rand of 0..255.

The method also accepts an optional block.

Either a block or the :handler key MUST be present.

If the connection fails, only the `on_close` callback will be called (with a `nil` client).

Returns the handler object used.



270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
# File 'ext/iodine/iodine_tcp.c', line 270

static VALUE iodine_tcp_connect(VALUE self, VALUE args) {
  // clang-format on
  Check_Type(args, T_HASH);
  VALUE rb_port = rb_hash_aref(args, port_id);
  VALUE rb_address = rb_hash_aref(args, address_id);
  VALUE rb_handler = rb_hash_aref(args, handler_id);
  VALUE rb_timeout = rb_hash_aref(args, timeout_id);
  uint8_t timeout = 0;
  if (rb_handler == Qnil || rb_handler == Qfalse || rb_handler == Qtrue) {
    rb_raise(rb_eArgError, "A callback object (:handler) must be provided.");
  }
  IodineStore.add(rb_handler);
  if (rb_address != Qnil) {
    Check_Type(rb_address, T_STRING);
  }
  if (rb_port != Qnil) {
    Check_Type(rb_port, T_STRING);
  }
  if (rb_timeout != Qnil) {
    Check_Type(rb_timeout, T_FIXNUM);
    timeout = NUM2USHORT(rb_timeout);
  }
  facil_connect(.port = (rb_port == Qnil ? NULL : StringValueCStr(rb_port)),
                .address =
                    (rb_address == Qnil ? NULL : StringValueCStr(rb_address)),
                .on_connect = iodine_tcp_on_connect,
                .on_fail = iodine_tcp_on_fail, .timeout = timeout,
                .udata = (void *)rb_handler);
  return rb_handler;
  (void)self;
}

.deferObject

Runs a block of code asyncronously (adds the code to the event queue).

Always returns the block of code to executed (Proc object).

Code will be executed only while Iodine is running (after start).

Code blocks that where scheduled to run before Iodine enters cluster mode will run on all child processes.



189
190
191
192
193
194
195
# File 'ext/iodine/iodine_defer.c', line 189

static VALUE iodine_defer_run(VALUE self) {
  rb_need_block();
  VALUE block = IodineStore.add(rb_block_proc());
  defer(iodine_defer_performe_once, (void *)block, NULL);
  return block;
  (void)self;
}

.listen(args) ⇒ Object

The listen method instructs iodine to listen to incoming connections using either TCP/IP or Unix sockets.

The method accepts a single Hash argument with the following optional keys:

:port

The port to listen to, deafults to 0 (using a Unix socket)

:address

The address to listen to, which could be a Unix Socket path as well as an IPv4 / IPv6 address. Deafults to 0.0.0.0 (or the IPv6 equivelant).

:handler

An object that answers the `call` method (i.e., a Proc).

The method also accepts an optional block.

Either a block or the :handler key MUST be present.

The handler Proc (or object) should return a connection callback object that supports the following callbacks (see also Connection):

on_open(client)

called after a connection was established

on_message(client, data)

called when incoming data is available. Data may be fragmented.

on_drained(client)

called when all the pending `client.write` events have been processed (see Iodine::Connection#pending).

ping(client)

called whenever a timeout has occured (see Iodine::Connection#timeout=).

on_shutdown(client)

called if the server is shutting down. This is called before the connection is closed.

on_close(client)

called when the connection with the client was closed.

The `client` argument is an Connection instance that represents the connection / the client.

Here's a telnet based chat-room example:

require 'iodine'
# define the protocol for our service
module ChatHandler
  def self.on_open(client)
    # Set a connection timeout
    client.timeout = 10
    # subscribe to the chat channel.
    client.subscribe :chat
    # Write a welcome message
    client.publish :chat, "new member entered the chat\r\n"
  end
  # this is called for incoming data - note data might be fragmented.
  def self.on_message(client, data)
    # publish the data we received
    client.publish :chat, data
    # close the connection when the time comes
    client.close if data =~ /^bye[\n\r]/
  end
  # called whenever timeout occurs.
  def self.ping(client)
    client.write "System: quite, isn't it...?\r\n"
  end
  # called if the connection is still open and the server is shutting down.
  def self.on_shutdown(client)
    # write the data we received
    client.write "Chat server going away. Try again later.\r\n"
  end
  # returns the callback object (self).
  def self.call
    self
  end
end
# we can bothe the `handler` keuword or a block, anything that answers #call.
Iodine.listen(port: "3000", handler: ChatHandler)
# start the service
Iodine.threads = 1
Iodine.start

Returns the handler object used.



219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
# File 'ext/iodine/iodine_tcp.c', line 219

static VALUE iodine_tcp_listen(VALUE self, VALUE args) {
  // clang-format on
  Check_Type(args, T_HASH);
  VALUE rb_port = rb_hash_aref(args, port_id);
  VALUE rb_address = rb_hash_aref(args, address_id);
  VALUE rb_handler = rb_hash_aref(args, handler_id);
  if (rb_handler == Qnil || rb_handler == Qfalse || rb_handler == Qtrue) {
    rb_need_block();
    rb_handler = rb_block_proc();
  }
  IodineStore.add(rb_handler);
  if (rb_address != Qnil) {
    Check_Type(rb_address, T_STRING);
  }
  if (rb_port != Qnil) {
    Check_Type(rb_port, T_STRING);
  }
  if (facil_listen(.port = (rb_port == Qnil ? NULL : StringValueCStr(rb_port)),
                   .address =
                       (rb_address == Qnil ? NULL
                                           : StringValueCStr(rb_address)),
                   .on_open = iodine_tcp_on_open,
                   .on_finish = iodine_tcp_on_finish,
                   .udata = (void *)rb_handler) == -1) {
    IodineStore.remove(rb_handler);
    rb_raise(rb_eRuntimeError,
             "failed to listen to requested address, unknown error.");
  }
  return rb_handler;
  (void)self;
}

.listen2http(opt) ⇒ Object

Listens to incoming HTTP connections and handles incoming requests using the Rack specification.

This is delegated to a lower level C HTTP and Websocket implementation, no Ruby object will be crated except the `env` object required by the Rack specifications.

Accepts a single Hash argument with the following properties:

(it's possible to set default values using the DEFAULT_HTTP_ARGS Hash)

app

the Rack application that handles incoming requests. Default: `nil`.

port

the port to listen to. Default: 3000.

address

the address to bind to. Default: binds to all possible addresses.

log

enable response logging (Hijacked sockets aren't logged). Default: off.

public

The root public folder for static file service. Default: none.

timeout

Timeout for inactive HTTP/1.x connections. Defaults: 40 seconds.

max_body

The maximum body size for incoming HTTP messages. Default: ~50Mib.

max_headers

The maximum total header length for incoming HTTP messages. Default: ~64Kib.

max_msg

The maximum Websocket message size allowed. Default: ~250Kib.

ping

The Websocket `ping` interval. Default: 40 seconds.

Either the `app` or the `public` properties are required. If niether exists, the function will fail. If both exist, Iodine will serve static files as well as dynamic requests.

When using the static file server, it's possible to serve `gzip` versions of the static files by saving a compressed version with the `gz` extension (i.e. `styles.css.gz`).

`gzip` will only be served to clients tat support the `gzip` transfer encoding.

Once HTTP/2 is supported (planned, but probably very far away), HTTP/2 timeouts will be dynamically managed by Iodine. The `timeout` option is only relevant to HTTP/1.x connections.



860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
# File 'ext/iodine/iodine_http.c', line 860

VALUE iodine_http_listen(VALUE self, VALUE opt) {
  // clang-format on
  uint8_t log_http = 0;
  size_t ping = 0;
  size_t max_body = 0;
  size_t max_headers = 0;
  size_t max_msg = 0;
  Check_Type(opt, T_HASH);
  /* copy from deafult hash */
  /* test arguments */
  VALUE app = rb_hash_aref(opt, ID2SYM(rb_intern("app")));
  VALUE www = rb_hash_aref(opt, ID2SYM(rb_intern("public")));
  VALUE port = rb_hash_aref(opt, ID2SYM(rb_intern("port")));
  VALUE address = rb_hash_aref(opt, ID2SYM(rb_intern("address")));
  VALUE tout = rb_hash_aref(opt, ID2SYM(rb_intern("timeout")));
  if (www == Qnil) {
    www = rb_hash_aref(iodine_default_args, ID2SYM(rb_intern("public")));
  }
  if (port == Qnil) {
    port = rb_hash_aref(iodine_default_args, ID2SYM(rb_intern("port")));
  }
  if (address == Qnil) {
    address = rb_hash_aref(iodine_default_args, ID2SYM(rb_intern("address")));
  }
  if (tout == Qnil) {
    tout = rb_hash_aref(iodine_default_args, ID2SYM(rb_intern("timeout")));
  }

  VALUE tmp = rb_hash_aref(opt, ID2SYM(rb_intern("max_msg")));
  if (tmp == Qnil) {
    tmp = rb_hash_aref(iodine_default_args, ID2SYM(rb_intern("max_msg")));
  }
  if (tmp != Qnil && tmp != Qfalse) {
    Check_Type(tmp, T_FIXNUM);
    max_msg = FIX2ULONG(tmp);
  }

  tmp = rb_hash_aref(opt, ID2SYM(rb_intern("max_body")));
  if (tmp == Qnil) {
    tmp = rb_hash_aref(iodine_default_args, ID2SYM(rb_intern("max_body")));
  }
  if (tmp != Qnil && tmp != Qfalse) {
    Check_Type(tmp, T_FIXNUM);
    max_body = FIX2ULONG(tmp);
  }
  tmp = rb_hash_aref(opt, ID2SYM(rb_intern("max_headers")));
  if (tmp == Qnil) {
    tmp = rb_hash_aref(iodine_default_args, ID2SYM(rb_intern("max_headers")));
  }
  if (tmp != Qnil && tmp != Qfalse) {
    Check_Type(tmp, T_FIXNUM);
    max_headers = FIX2ULONG(tmp);
  }

  tmp = rb_hash_aref(opt, ID2SYM(rb_intern("ping")));
  if (tmp == Qnil) {
    tmp = rb_hash_aref(iodine_default_args, ID2SYM(rb_intern("ping")));
  }
  if (tmp != Qnil && tmp != Qfalse) {
    Check_Type(tmp, T_FIXNUM);
    ping = FIX2ULONG(tmp);
  }
  if (ping > 255) {
    fprintf(stderr, "Iodine Warning: Websocket timeout value "
                    "is over 255 and will be ignored.\n");
    ping = 0;
  }

  tmp = rb_hash_aref(opt, ID2SYM(rb_intern("log")));
  if (tmp == Qnil) {
    tmp = rb_hash_aref(iodine_default_args, ID2SYM(rb_intern("log")));
  }
  if (tmp != Qnil && tmp != Qfalse)
    log_http = 1;

  if ((app == Qnil || app == Qfalse) && (www == Qnil || www == Qfalse)) {
    fprintf(stderr, "Iodine Warning: HTTP without application or public folder "
                    "(ignored).\n");
    return Qfalse;
  }

  if ((www != Qnil && www != Qfalse)) {
    Check_Type(www, T_STRING);
    IodineStore.add(www);
    rb_hash_aset(env_template_no_upgrade, XSENDFILE_TYPE, XSENDFILE);
    rb_hash_aset(env_template_no_upgrade, XSENDFILE_TYPE_HEADER, XSENDFILE);
    support_xsendfile = 1;
  } else
    www = 0;

  if ((address != Qnil && address != Qfalse))
    Check_Type(address, T_STRING);
  else
    address = 0;

  if ((tout != Qnil && tout != Qfalse)) {
    Check_Type(tout, T_FIXNUM);
    tout = FIX2ULONG(tout);
  } else
    tout = 0;
  if (tout > 255) {
    fprintf(stderr, "Iodine Warning: HTTP timeout value "
                    "is over 255 and is silently ignored.\n");
    tout = 0;
  }

  if (port != Qnil && port != Qfalse) {
    if (!RB_TYPE_P(port, T_STRING) && !RB_TYPE_P(port, T_FIXNUM))
      rb_raise(rb_eTypeError,
               "The `port` property MUST be either a String or a Number");
    if (RB_TYPE_P(port, T_FIXNUM))
      port = rb_funcall2(port, iodine_to_s_method_id, 0, NULL);
    IodineStore.add(port);
  } else if (port == Qfalse)
    port = 0;
  else {
    port = rb_str_new("3000", 4);
    IodineStore.add(port);
  }

  if ((app != Qnil && app != Qfalse))
    IodineStore.add(app);
  else
    app = 0;

  if (http_listen(
          StringValueCStr(port), (address ? StringValueCStr(address) : NULL),
          .on_request = on_rack_request, .on_upgrade = on_rack_upgrade,
          .udata = (void *)app, .timeout = (tout ? FIX2INT(tout) : tout),
          .ws_timeout = ping, .ws_max_msg_size = max_msg,
          .max_header_size = max_headers, .on_finish = free_iodine_http,
          .log = log_http, .max_body_size = max_body,
          .public_folder = (www ? StringValueCStr(www) : NULL))) {
    fprintf(stderr,
            "ERROR: Failed to initialize a listening HTTP socket for port %s\n",
            port ? StringValueCStr(port) : "3000");
    return Qfalse;
  }

  if ((app == Qnil || app == Qfalse)) {
    fprintf(stderr,
            "* Iodine: (no app) the HTTP service on port %s will only serve "
            "static files.\n",
            (port ? StringValueCStr(port) : "3000"));
  }
  defer(iodine_print_http_msg, (www ? (void *)www : NULL), (void *)port);

  return Qtrue;
  (void)self;
}

.on_idleObject

Schedules a single occuring event for the next idle cycle.

To schedule a reoccuring event, simply reschedule the event at the end of it's run.

i.e.

IDLE_PROC = Proc.new { puts "idle"; Iodine.on_idle &IDLE_PROC }
Iodine.on_idle &IDLE_PROC


56
57
58
59
60
61
62
63
64
65
# File 'ext/iodine/iodine.c', line 56

VALUE iodine_sched_on_idle(VALUE self) {
  rb_need_block();
  VALUE block = rb_block_proc();
  IodineStore.add(block);
  spn_lock(&iodine_on_idle_lock);
  fio_ls_push(&iodine_on_idle_list, (void *)block);
  spn_unlock(&iodine_on_idle_lock);
  return block;
  (void)self;
}

.on_shutdownObject

Sets a block of code to run once a Worker process shuts down (both in single process mode and cluster mode).



323
324
325
326
327
328
329
330
331
332
333
# File 'ext/iodine/iodine_defer.c', line 323

VALUE iodine_on_shutdown_add(VALUE self) {
  // clang-format on
  rb_need_block();
  VALUE block = rb_block_proc();
  IodineStore.add(block);
  spn_lock(&iodine_on_shutdown_lock);
  fio_ls_push(&iodine_on_shutdown_list, (void *)block);
  spn_unlock(&iodine_on_shutdown_lock);
  return block;
  (void)self;
}

.patch_rackObject

Will monkey patch some Rack methods to increase their performance.

This is recommended, see Iodine::Rack::Utils for details.



65
66
67
68
69
70
71
72
# File 'lib/iodine.rb', line 65

def self.patch_rack
::Rack::Utils.class_eval do
  Iodine::Base::MonkeyPatch::RackUtils.methods(false).each do |m|
    ::Rack::Utils.define_singleton_method(m,
          Iodine::Base::MonkeyPatch::RackUtils.instance_method(m) )
    end
  end
end

.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)

Alternatively, accepts the following named arguments:

:to

The channel to publish to (required).

:message

The message to be published (required).

:engine

If provided, the engine to use for pub/sub. Otherwise the default engine is used.



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
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
# File 'ext/iodine/iodine_connection.c', line 616

static VALUE iodine_pubsub_publish(int argc, VALUE *argv, VALUE self) {
  // clang-format on
  VALUE rb_ch, rb_msg, rb_engine = Qnil;
  const 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 = PUBSUB_PROCESS_ENGINE;
  } else if (rb_engine != Qnil) {
    // collect engine object
    iodine_pubsub_s *e = iodine_pubsub_CData(rb_engine);
    if (e) {
      engine = e->engine;
    }
  }

  FIOBJ ch = fiobj_str_new(RSTRING_PTR(rb_ch), RSTRING_LEN(rb_ch));
  FIOBJ msg = fiobj_str_new(RSTRING_PTR(rb_msg), RSTRING_LEN(rb_msg));

  intptr_t ret =
      pubsub_publish(.engine = engine, .channel = ch, .message = msg);
  fiobj_free(ch);
  fiobj_free(msg);
  if (!ret)
    return Qfalse;
  return Qtrue;
  (void)self;
}

.runObject

Runs a block of code asyncronously (adds the code to the event queue).

Always returns the block of code to executed (Proc object).

Code will be executed only while Iodine is running (after start).

Code blocks that where scheduled to run before Iodine enters cluster mode will run on all child processes.



189
190
191
192
193
194
195
# File 'ext/iodine/iodine_defer.c', line 189

static VALUE iodine_defer_run(VALUE self) {
  rb_need_block();
  VALUE block = IodineStore.add(rb_block_proc());
  defer(iodine_defer_performe_once, (void *)block, NULL);
  return block;
  (void)self;
}

.run_after(milliseconds) ⇒ Object

Runs the required block after the specified number of milliseconds have passed. Time is counted only once Iodine started running (using start).

Tasks scheduled before calling start will run once for every process.

Always returns a copy of the block object.



205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
# File 'ext/iodine/iodine_defer.c', line 205

static VALUE iodine_defer_run_after(VALUE self, VALUE milliseconds) {
  (void)(self);
  if (milliseconds == Qnil) {
    return iodine_defer_run(self);
  }
  if (TYPE(milliseconds) != T_FIXNUM) {
    rb_raise(rb_eTypeError, "milliseconds must be a number");
    return Qnil;
  }
  size_t milli = FIX2UINT(milliseconds);
  if (milli == 0) {
    return iodine_defer_run(self);
  }
  // requires a block to be passed
  rb_need_block();
  VALUE block = rb_block_proc();
  if (block == Qnil)
    return Qfalse;
  IodineStore.add(block);
  if (facil_run_every(milli, 1, iodine_defer_run_timer, (void *)block,
                      (void (*)(void *))IodineStore.remove) == -1) {
    perror("ERROR: Iodine couldn't initialize timer");
    return Qnil;
  }
  return block;
}

.run_every(*args) ⇒ Object

Runs the required block after the specified number of milliseconds have passed. Time is counted only once Iodine started running (using start).

Accepts:

milliseconds

the number of milliseconds between event repetitions.

repetitions

the number of event repetitions. Defaults to 0 (never ending).

block

(required) a block is required, as otherwise there is nothing to

perform.

The event will repeat itself until the number of repetitions had been delpeted.

Always returns a copy of the block object.



248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
# File 'ext/iodine/iodine_defer.c', line 248

static VALUE iodine_defer_run_every(int argc, VALUE *argv, VALUE self) {
  (void)(self);
  VALUE milliseconds, repetitions, block;

  rb_scan_args(argc, argv, "11&", &milliseconds, &repetitions, &block);

  if (TYPE(milliseconds) != T_FIXNUM) {
    rb_raise(rb_eTypeError, "milliseconds must be a number.");
    return Qnil;
  }
  if (repetitions != Qnil && TYPE(repetitions) != T_FIXNUM) {
    rb_raise(rb_eTypeError, "repetitions must be a number or `nil`.");
    return Qnil;
  }

  size_t milli = FIX2UINT(milliseconds);
  size_t repeat = (repetitions == Qnil) ? 0 : FIX2UINT(repetitions);
  // requires a block to be passed
  rb_need_block();
  IodineStore.add(block);
  if (facil_run_every(milli, repeat, iodine_defer_run_timer, (void *)block,
                      (void (*)(void *))IodineStore.remove) == -1) {
    perror("ERROR: Iodine couldn't initialize timer");
    return Qnil;
  }
  return block;
}

.startObject

This will block the calling (main) thread and start the Iodine reactor.

When using cluster mode (2 or more worker processes), it is important that no other threads are active.

For many reasons, `fork` should NOT be called while multi-threading, so cluster mode must always be initiated from the main thread in a single thread environment.

For information about why forking in multi-threaded environments should be avoided, see (for example): www.linuxprogrammingblog.com/threads-and-fork-think-twice-before-using-them



195
196
197
198
199
200
201
202
203
204
205
206
207
# File 'ext/iodine/iodine.c', line 195

static VALUE iodine_start(VALUE self) {
  if (facil_is_running()) {
    rb_raise(rb_eRuntimeError, "Iodine already running!");
  }
  VALUE threads_rb = iodine_threads_get(self);
  VALUE workers_rb = iodine_workers_get(self);
  iodine_start_params_s params = {
      .threads = NUM2SHORT(threads_rb), .workers = NUM2SHORT(workers_rb),
  };
  iodine_print_startup_message(params);
  IodineCaller.leaveGVL(iodine_run_outside_GVL, &params);
  return 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).



507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
# File 'ext/iodine/iodine_connection.c', line 507

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 connection. */
    }
    if (args.block == Qnil && args.binary) {
      args.block = Qtrue;
    }
    spn_add(&c->ref, 1);
  }

  FIOBJ channel =
      fiobj_str_new(RSTRING_PTR(args.channel), RSTRING_LEN(args.channel));
  pubsub_sub_pt sub =
      pubsub_subscribe(.channel = channel, .on_message = iodine_on_pubsub,
                       .on_unsubscribe = iodine_on_unsubscribe, .udata1 = c,
                       .udata2 = (void *)args.block,
                       .use_pattern = args.pattern);
  fiobj_free(channel);
  if (c) {
    spn_lock(&c->lock);
    if (c->info.uuid == -1) {
      pubsub_unsubscribe(sub);
      spn_unlock(&c->lock);
      return Qnil;
    } else {
      iodine_sub_add(&c->subscriptions, sub);
    }
    spn_unlock(&c->lock);
  } else {
    spn_lock(&sub_lock);
    iodine_sub_add(&sub_global, sub);
    spn_unlock(&sub_lock);
  }
  return args.channel;
}

.threadsObject

Returns the number of worker threads that will be used when start is called.

Negative numbers are translated as fractions of the number of CPU cores. i.e., -2 == half the number of detected CPU cores.

Zero values promise nothing (iodine will decide what to do with them).



106
107
108
109
110
111
# File 'ext/iodine/iodine.c', line 106

static VALUE iodine_threads_get(VALUE self) {
  VALUE i = rb_ivar_get(self, rb_intern2("@threads", 8));
  if (i == Qnil)
    i = INT2NUM(0);
  return i;
}

.threads=(val) ⇒ Object

Sets the number of worker threads that will be used when start is called.

Negative numbers are translated as fractions of the number of CPU cores. i.e., -2 == half the number of detected CPU cores.

Zero values promise nothing (iodine will decide what to do with them).



122
123
124
125
126
127
128
129
# File 'ext/iodine/iodine.c', line 122

static VALUE iodine_threads_set(VALUE self, VALUE val) {
  Check_Type(val, T_FIXNUM);
  if (NUM2SSIZET(val) >= (1 << 12)) {
    rb_raise(rb_eRangeError, "requsted thread count is out of range.");
  }
  rb_ivar_set(self, rb_intern2("@threads", 8), val);
  return val;
}

.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.



572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
# File 'ext/iodine/iodine_connection.c', line 572

static VALUE iodine_pubsub_unsubscribe(VALUE self, VALUE name) {
  // clang-format on
  iodine_connection_data_s *c = NULL;
  FIOBJ channel = fiobj_str_new(RSTRING_PTR(name), RSTRING_LEN(name));
  VALUE ret;
  if (TYPE(self) == T_MODULE) {
    spn_lock(&sub_lock);
    ret = iodine_sub_unsubscribe(&sub_global, channel);
    spn_unlock(&sub_lock);
  } else {
    c = iodine_connection_validate_data(self);
    if (!c) {
      return Qnil; /* cannot subscribe a closed connection. */
    }
    spn_lock(&sub_lock);
    ret = iodine_sub_unsubscribe(&sub_global, channel);
    spn_unlock(&sub_lock);
  }
  fiobj_free(channel);
  return ret;
}

.workersObject

Returns the number of worker processes that will be used when start

is called.

Negative numbers are translated as fractions of the number of CPU cores.
i.e., -2 == half the number of detected CPU cores.

Zero values promise nothing (iodine will decide what to do with them).


140
141
142
143
144
145
# File 'ext/iodine/iodine.c', line 140

static VALUE iodine_workers_get(VALUE self) {
  VALUE i = rb_ivar_get(self, rb_intern2("@workers", 8));
  if (i == Qnil)
    i = INT2NUM(0);
  return i;
}

.workers=(val) ⇒ Object

Sets the number of worker processes that will be used when start is called.

Negative numbers are translated as fractions of the number of CPU cores. i.e., -2 == half the number of detected CPU cores.

Zero values promise nothing (iodine will decide what to do with them).



156
157
158
159
160
161
162
163
# File 'ext/iodine/iodine.c', line 156

static VALUE iodine_workers_set(VALUE self, VALUE val) {
  Check_Type(val, T_FIXNUM);
  if (NUM2SSIZET(val) >= (1 << 9)) {
    rb_raise(rb_eRangeError, "requsted worker process count is out of range.");
  }
  rb_ivar_set(self, rb_intern2("@workers", 8), val);
  return val;
}