Presence API for Ruby SDK

Presence lets you track who is online or offline and store custom state information. Presence shows:

When a user has joined or left a channel
How many users are subscribed to a particular channel (occupancy)
Which channels a user or device is subscribed to
Presence state associated with these users

Learn more about our Presence feature in the Presence overview.

Here now

Requires Presence

This method requires that the Presence add-on is enabled for your key in the Admin Portal.

For information on how to receive presence events and what those events are, refer to Presence Events.

This method returns information about the current state of a channel, including a list of unique user IDs (universally unique identifiers, UUIDs) currently subscribed to the channel and the total occupancy count of the channel.

Cache

This method has a 3-second response cache time.

Method(s)

To call Here Now you can use the following method(s) in the Ruby SDK:

here_now(
    channels: channels,
    channel_groups: channel_groups,
    http_sync: http_sync,
    callback: callback
)

* required

Parameter	Description
`channels` Type: String, Symbol	Specify the `channels` name to return occupancy results. If `channels` is not provided, `here_now` will return data for all channels (global `here_now`).
`channel_groups` Type: String, Symbol	Specify the `channel_groups` name to return occupancy results. Wildcards are not supported.
`http_sync` Type: Boolean	Default `false`. Method will be executed `asynchronously` and will return future, to get it's `value` you can use `value` method. If set to `true`, method will return array of envelopes (even if there's only one `envelope`). For `sync` methods `Envelope` object will be returned.
`callback` Type: Lambda accepting one parameter	`Callback` that will be called for each `envelope`. For `async` methods future will be returned, to retrieve `value` `Envelope` object you have to call `value` method (thread will be locked until the `value` is returned).

Sample code

Get a list of uuids subscribed to channel

Reference code

This example is a self-contained code snippet ready to be run. It includes necessary imports and executes methods with console logging. Use it as a reference when working with other examples in this document.

require 'pubnub'

def fetch_uuids(pubnub)
  pubnub.here_now(
    channel: 'my_channel'
  ) do |envelope|
    if envelope.status[:error]
      puts "Error fetching UUIDs: #{envelope.status[:error]}"
    else
      puts "UUIDs subscribed to my_channel: #{envelope.result[:data][:uuids]}"
      puts "Occupancy: #{envelope.result[:data][:occupancy]}"
    end
  end
end

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Response

#<Pubnub::Envelope
    @result = {
        :data => {
            :uuids => ["2d588b75-0451-4bde-8952-13128c10e952"],
            :occupancy => 1
        }
    },
    @status = {
        :code => 200
    }
>

Where now

Requires Presence

This method requires that the Presence add-on is enabled for your key in the Admin Portal.

For information on how to receive presence events and what those events are, refer to Presence Events.

This method returns the list of channels a UUID is subscribed to.

Timeout events

If the app restarts (or the page refreshes) within the heartbeat window, no timeout event is generated.

Method(s)

To call where_now() you can use the following method(s) in the Ruby SDK:

where_now(
    uuid: uuid,
    http_sync: http_sync,
    callback: callback
)

* required

Parameter	Description
`uuid` * Type: String	`UUID` we are looking for.
`http_sync` Type: Boolean	Default `false`. Method will be executed `asynchronously` and will return future, to get it's `value` you can use `value` method. If set to `true`, method will return array of envelopes (even if there's only one `envelope`). For `sync` methods `Envelope` object will be returned.
`callback` Type: Lambda accepting one parameter	`Callback` that will be called for each `envelope`. For `async` methods future will be returned, to retrieve `value` `Envelope` object you have to call `value` method (thread will be locked until the `value` is returned).

Sample code

pubnub.where_now(
    uuid: "my_uuid"
) do |envelope|
    puts envelope.result[:data]
end

Response

#<Pubnub::Envelope:0x007fd38584c168
    @result = {
        :data => {
        "channels" => ["whatever"]
        }
    },
    @status = {
        :code =>200
    }
>

User state

Requires Presence

This method requires that the Presence add-on is enabled for your key in the Admin Portal.

For information on how to receive presence events and what those events are, refer to Presence Events.

Clients can set a dynamic custom state (score, game state, location) for their users on one or more channels and store it on a channel as long as the user stays subscribed.

The state is not persisted, and when the client disconnects, the state data is lost. For more information, refer to Presence State.

Method(s)

set_state(
    channels: channels,
    state: state,
    http_sync: http_sync,
    callback: callback
)

* required

Parameter	Description
`channels` * Type: String, Symbol	Specify `channels` name to set `state` for.
`state` * Type: Hash	The `state` to set.
`http_sync` Type: Boolean	Default `false`. Method will be executed `asynchronously` and will return future, to get it's `value` you can use `value` method. If set to `true`, method will return array of envelopes (even if there's only one `envelope`). For `sync` methods `Envelope` object will be returned.
`callback` Type: Lambda accepting one parameter	`Callback` that will be called for each `envelope`. For `async` methods future will be returned, to retrieve `value` `Envelope` object you have to call `value` method (thread will be locked until the `value` is returned).

get_state(
    channels: channels,
    uuid: uuid,
    http_sync: http_sync,
    callback: callback
)

* required

Parameter	Description
`channels` * Type: String, Symbol	Specify `channels` name to get `state` from.
`uuid` Type: String	Specifies `UUID`.
`http_sync` Type: Boolean	Default `false`. Method will be executed `asynchronously` and will return future, to get it's `value` you can use `value` method. If set to `true`, method will return array of envelopes (even if there's only one `envelope`). For `sync` methods `Envelope` object will be returned.
`callback` Type: Lambda accepting one parameter	`Callback` that will be called for each `envelope`. For `async` methods future will be returned, to retrieve `value` `Envelope` object you have to call `value` method (thread will be locked until the `value` is returned).

Sample code

Set state

pubnub.set_state(channel: 'my_channel', state: { key: 'value' }) do |envelope|
    puts envelope.status
end

Get state

pubnub.state(channel: :my_channel, uuid: 'some-uuid') do |envelope|
    puts envelope.result[:data][:state]
end

Response

#<Pubnub::Envelope:0x007fd3851b5cc8
    @result = {
        :data => {
            :state => {
                "age"=>59,
                "first" => "Robert",
                "last" => "Plant"
            },
            :channel=>"whatever"
        }
    },
    @status = {
        :code => 200
    }
>

Here now​

Requires Presence

Cache

Method(s)​

Sample code​

Get a list of uuids subscribed to channel​

Reference code

Response​

Where now​

Requires Presence

Timeout events

Method(s)​

Sample code​

Response​

User state​

Requires Presence

Method(s)​

Sample code​

Set state​

Get state​

Response​

Here now

Method(s)

Sample code

Get a list of uuids subscribed to channel

Response

Where now

Method(s)

Sample code

Response

User state

Method(s)

Sample code

Set state

Get state

Response