Presence API for PubNub Python-Twisted SDK

Deprecated

NOTICE: Based on current web trends and our own usage data, PubNub's Python Twisted SDK is deprecated as of May 1, 2019. Deprecation means we will no longer be updating the Python Twisted SDK but will continue to support users currently using it. Please feel free to use our other Python SDK offerings as they will continue to be supported and maintained. If you would like to use the Python Twisted SDK specifically, we would love to work with you on keeping this project alive!

Presence enables you to track the online and offline status of users and devices in real time, as well as store custom state information. Presence provides authoritative information on:

When a user has joined or left a channel
Who, and how many, users are subscribed to a particular channel
Which channel(s) an individual user is subscribed to
Associated state information for these users

Learn more about our Presence feature here.

Here Now

Requires Presence add-on

This method requires that the Presence add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

You can obtain information about the current state of a channel including a list of unique user-ids currently subscribed to the channel and the total occupancy count of the channel by calling the here_now() function in your application.

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 Python-Twisted SDK:

pubnub.here_now().channels(String|List|Tuple).channel_groups(String|List|Tuple).include_state(Boolean).include_uuids(Boolean)

Parameter	Type	Required	Default	Description
`channels`	String \| List \| Tuple	Optional		The `channels` to get the here now details.
`channel_groups`	String \| List \| Tuple	Optional		The `channel groups` to get the here now details.
`include_state`	Boolean	Optional	`False`	If `True`, the response will include the presence states of the users for channels/channelGroups.
`include_uuids`	Boolean	Optional	`True`	If `True`, the response will include the UUIDs of the connected clients.

Basic Usage

Get a list of UUIDs subscribed to channel

envelope = yield pubnub.here_now()\
    .channels("my_channel", "demo")\
    .include_uuids(True)\
    .future()

if envelope.status.is_error():
    # handle error
    return

for channel_data in envelope.result.channels:
    print("---")
    print("channel: %s" % channel_data.channel_name)
    print("occupancy: %s" % channel_data.occupancy)

    print("occupants: %s" % channel_data.channel_name)
show all 17 lines

Returns

The here_now() operation returns a PNHereNowResult which contains the following fields:

Field	Type	Description
`total_channels`	Int	Total `channels`.
`total_occupancy`	Int	Total `occupancy`
`channels`	Dict	A dict with values of `PNHereNowChannelData` for each channel. See PNHereNowChannelData for more details.

PNHereNowChannelData

Field	Type	Description
`channel_name`	String	`channel` name.
`occupancy`	Int	`occupancy` of the `channel`.
`occupants`	List	A list of `PNHereNowOccupantData`, see PNHereNowOccupantData for more details.

PNHereNowOccupantData

Field	Type	Description
`uuid`	String	`uuid` of the user.
`state`	Dict	`state` of the user.

Other Examples

Returning State

Requires Presence add-on

This method requires that the Presence add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

d = pubnub.here_now().channels("my_channel").\
    include_uuids(True).include_state(True).deferred()

d.addCallback(my_callback)

Example Response

{
    total_channels: 1,
    channels: [{
        channel_name: "my_channel",
        occupancy: 1,
        occupants: [{
            uuid: "myUuid1"
            state: {
                "abcd": {
                    "age": 15
                }
            }
        }]
    }],
    total_occupancy: 1
show all 16 lines

Return Occupancy Only

Requires Presence add-on

This method requires that the Presence add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

You can return only the occupancy information for a single channel by specifying the channel and setting UUIDs to false:

d = pubnub.here_now().channels("my_channel").\
    include_uuids(False).include_state(False).deferred()

d.addCallback(my_callback)

Example Response

{
    total_channels: 1,
    channels: [{
        channel_name: "my_channel",
        occupancy: 3,
        occupants: []
    }],
    total_occupancy: 3
}

Here Now for Channel Groups

d = pubnub.here_now().channel_groups(['cg1', 'cg2', 'cg3']).\
    include_uuids(True).include_state(True).deferred()

d.addCallback(my_callback)

Example Response

{
    total_channels: 1,
    channels: [
        {
            channel_name: "my_channel",
            occupancy: 1,
            occupants: [{
                uuid: "143r34f34t34fq34q34q3",
                state: None
            }]
        },
        {
            occupancy: 1,
            occupants: [{
                uuid: "123123234t234f34fq3dq",
show all 35 lines

Where Now

Requires Presence add-on

This method requires that the Presence add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

You can obtain information about the current list of channels to which a UUID is subscribed to by calling the where_now() function in your application.

Note

If the app is killed/crashes and restarted (or the page containing the PubNub instance is refreshed on the browser) within the heartbeat window no timeout event is generated.

Method(s)

To call where_now() you can use the following method(s) in the Python-Twisted SDK:

pubnub.where_now().uuid(String)

Parameter	Type	Required	Description
`uuid`	String	Optional	`uuid` to get info on.

Basic Usage

You simply need to define the uuid and the callback function to be used to send the data to as in the example below.

Get a list of channels a UUID is subscribed to

# if we're using inlineCallbacks
envelope = yield pubnub.where_now().deferred()

# if we're not using inlineCallbacks
d = pubnub.where_now().deferred()
d.addCallback(my_callback)

Returns

The where_now() operation returns a PNWhereNowResult which contains the following fields:

Field	Type	Description
`channels`	List	The list of `channels` where the `UUID` is present.

Other Examples

Obtain information about the current list of channels of some other UUID

d = pubnub.where_now().uuid('some-other-uuid').deferred()
d.addCallback(my_callback)

User State

Requires Presence add-on

This method requires that the Presence add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

The state API is used to set/get key/value pairs specific to a subscriber uuid.

State information is supplied as a JSON object of key/value pairs.

Important

Presence state must be expressed as a dict. When calling set_state, be sure to supply an initialized dict which can be serialized.

Method(s)

Set State

pubnub.set_state().channels(String|List|Tuple).channel_groups(String|List|Tuple).state(Dict)

Parameter	Type	Required	Description
`channels`	String \| List \| Tuple	Optional	`channels` to set `state`.
`channel_groups`	String \| List \| Tuple	Optional	`channel groups` to set `state`.
`state`	Dict	Optional	`state` to set.

Get State

pubnub.get_state().channels(String|List|Tuple).channel_groups(String|List|Tuple).uuid(String)

Parameter	Type	Required	Description
`channels`	String \| List \| Tuple	Optional	`channels` to get `state`.
`channel_groups`	String \| List \| Tuple	Optional	`channel groups` to get `state`.
`uuid`	String	Optional	`uuid` to get state from.

Basic Usage

Set State

my_state = {
   'age': 20
}
d = pubnub.set_state().channels(['ch1', 'ch2', 'ch3']).state(my_state).deferred()
d.addCallback(my_callback)

Get State

d = pubnub.get_state().channels(['ch1', 'ch2', 'ch3']).uuid('such_uuid').deferred()
d.addCallback(my_callback)

Returns

The set_state() operation returns a PNSetStateResult which contains the following fields:

Field	Type	Description
`state`	Dict	dict of UUIDs and the user states.

The get_state() operation returns a PNGetStateResult which contains the following fields:

Field	Type	Description
`channels`	Dict	dict of `channels` and the user states.

Other Examples

Set state for channels in channel group:

my_state = {
    'age': 20
}
envelope = yield pubnub.set_state().channel_groups(['gr1', 'gr2', 'gr3']).state(my_state).future()

The above code would return the following response to the client:

{
    first  : "Robert",
    last   : "Plant",
    age    : 59,
    region : "UK"
}

Deprecated

Here Now​

Requires Presence add-on

Cache

Method(s)​

Basic Usage​

Get a list of UUIDs subscribed to channel​

Returns​

PNHereNowChannelData​

PNHereNowOccupantData​

Other Examples​

Returning State​

Requires Presence add-on

Example Response​

Return Occupancy Only​

Requires Presence add-on

Example Response​

Here Now for Channel Groups​

Example Response​

Where Now​

Requires Presence add-on

Note

Method(s)​

Basic Usage​

Get a list of channels a UUID is subscribed to​

Returns​

Other Examples​

Obtain information about the current list of channels of some other UUID​

User State​

Requires Presence add-on

Important

Method(s)​

Set State​

Get State​

Basic Usage​

Set State​

Get State​

Returns​

Other Examples​

Here Now

Method(s)

Basic Usage

Get a list of UUIDs subscribed to channel

Returns

PNHereNowChannelData

PNHereNowOccupantData

Other Examples

Returning State

Example Response

Return Occupancy Only

Example Response

Here Now for Channel Groups

Example Response

Where Now

Method(s)

Basic Usage

Get a list of channels a UUID is subscribed to

Returns

Other Examples

Obtain information about the current list of channels of some other UUID

User State

Method(s)

Set State

Get State

Basic Usage

Set State

Get State

Returns

Other Examples