Message Reactions API for PubNub Kotlin SDK

Add or remove actions on published messages to build features like receipts, reactions, or to associate custom metadata to messages. Clients can subscribe to a channel to receive message action events on that channel. They can also fetch past message actions from Message Persistence independently or when they fetch original messages.

Calling Kotlin methods

Most PubNub Kotlin SDK method invocations return an Endpoint object, which allows you to decide whether to perform the operation synchronously or asynchronously. You must choose one of these or the operation will not be performed at all.

For example, the following code is valid and will compile, but the publish won't be performed:

pubnub.publish(
    message = "this sdk rules!",
    channel = "my_channel"
)

To successfully publish a message, you must follow the actual method invocation with whether to perform it synchronously or asynchronously, for example:

pubnub.publish(
    message = "this sdk rules!",
    channel = "my_channel"
).async { result, status ->
    if (status.error) {
        // handle error
    } else {
        // handle successful method result
    }
}

Add Message Reaction

Requires Message Persistence

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

Add an action on a published message. Returns the added action in the response.

Method(s)

To Add a Message Reaction you can use the following method(s) in the Kotlin SDK:

pubnub.addMessageAction(
    channel: String,
    messageAction: PNMessageAction
).async { result, status -> }

Parameter	Type	Required	Description
channel	String	Yes	Specifies channel name to publish message actions to.
messageAction	PNMessageAction	Yes	The message action object containing the message action's type, value and the publish timetoken of the original message. See PNMessageAction for more details.

Basic Usage

pubnub.addMessageAction(
    channel = "my_channel",
    messageAction = PNMessageAction(
        type = "reaction",
        value = "smiley_face",
        messageTimetoken = 15701761818730000L
    )
).async { result, status ->
    if (!status.error) {
        println(result!!.type)
        println(result.value)
        println(result.uuid)
        println(result.actionTimetoken)
        println(result.messageTimetoken)
    } else {

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Returns

The addMessageAction() operation returns a PNAddMessageActionResult which contains the following operations:

Method	Type	Description
type	String	Message action's type.
value	String	Message action's value.
uuid	String	Publisher of the message action.
actionTimetoken	String	Timestamp when the message action was created.
messageTimetoken	Long	Timestamp when the actual message was created the message action belongs to.

PNMessageAction

Method	Type	Description
type	String	Message action's type.
value	String	Message action's value.
messageTimetoken	Long	Timestamp when the actual message was created the message action belongs to.

Remove Message Reaction

Requires Message Persistence

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

Remove a previously added action on a published message. Returns an empty response.

Method(s)

To Remove a Message Reaction you can use the following method(s) in the Kotlin SDK:

pubnub.removeMessageAction(
    channel: String,
    messageTimetoken: Long,
    actionTimetoken: Long
).async { result, status -> }

Parameter	Type	Required	Description
channel	String	Yes	Specifies channel name to remove message actions from.
messageTimetoken	Long	Yes	Publish timetoken of the original message.
actionTimetoken	Long	Yes	Publish timetoken of the message action to be removed.

Basic Usage

pubnub.removeMessageAction(
    channel = "my_channel",
    messageTimetoken = 15701761818730000L,
    actionTimetoken = 15701775691010000L
).async { _, status ->
    if (!status.error) {
        // result has no actionable data
        // it's enough to check if the status itself is not an error
    } else {
        // handle error
        status.exception?.printStackTrace()
    }
}

Returns

The removeMessageAction() operation returns a no actionable data.

Get Message Reactions

Requires Message Persistence

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

Get a list of message actions in a channel. Returns a list of actions sorted by the action's timetoken in ascending order.

Method(s)

To Get Message Reactions you can use the following method(s) in the Kotlin SDK:

pubnub.getMessageActions(
    channel: String,
    page: PNBoundedPage
)

Parameter	Type	Required	Description
channel	String	Yes	The channel name.
page	PNBoundedPage	Optional	The paging object used for pagination. Set limit to specify the number of actions to return in response. Default/Maximum is 100. start and end denotes the range boundaries. Return values will be less than start and greater or equal to end.

Basic Usage

pubnub.getMessageActions(
    channel = "my_channel"
).async { result, status ->
    if (!status.error) {
        result!!.actions.forEach {
            println(it.type)
            println(it.value)
            println(it.uuid)
            println(it.actionTimetoken)
            println(it.messageTimetoken)
        }
    } else {
        // handle error
        status.exception?.printStackTrace()
    }

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Returns

The getMessageActions() operation returns a list of PNGetMessageActionsResult? objects, each containing the following operations:

Method	Type	Description
type	String	Message action's type.
value	String	Message action's value.
uuid	String	Publisher of the message action.
actionTimetoken	String	Timestamp when the message action was created.
messageTimetoken	Long	Timestamp when the actual message was created the message action belongs to.
page	PNBoundedPage	If exists indicates that more data is available. It can be passed directly to another call of getMessageActions to retrieve this remaining data.

Other Examples

Fetch Messages with paging

fun main() {
    getMessageActionsWithPaging(
        channel = "my_channel",
        start = System.currentTimeMillis() * 10_000L
    ) { actions ->
        actions.forEach {
            println(it.type)
            println(it.value)
            println(it.uuid)
            println(it.messageTimetoken)
            println(it.actionTimetoken)
        }
    }
}

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