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).


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# File 'ext/iodine/iodine_connection.c', line 217

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).


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# File 'ext/iodine/iodine_connection.c', line 314

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.


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# File 'ext/iodine/iodine_connection.c', line 325

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.


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# File 'ext/iodine/iodine_connection.c', line 342

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)

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# File 'ext/iodine/iodine_connection.c', line 230

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).


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# File 'ext/iodine/iodine_connection.c', line 244

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).


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# File 'ext/iodine/iodine_connection.c', line 258

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)

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.

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# File 'ext/iodine/iodine_connection.c', line 686

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;
}

#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).


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# File 'ext/iodine/iodine_connection.c', line 578

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.


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# File 'ext/iodine/iodine_connection.c', line 282

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.


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# File 'ext/iodine/iodine_connection.c', line 296

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.


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# File 'ext/iodine/iodine_connection.c', line 646

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.

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).


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# 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.");
  }
  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;
}