Message Persistence API for PubNub Unity SDK

Message Persistence provides real-time access to the history of all messages published to PubNub. Each published message is timestamped to the nearest 10 nanoseconds and is stored across multiple availability zones in several geographical locations. Stored messages can be encrypted with AES-256 message encryption, ensuring that they are not readable while stored on PubNub's network. For more information, refer to Message Persistence.

Messages can be stored for a configurable duration or forever, as controlled by the retention policy that is configured on your account. The following options are available: 1 day, 7 days, 30 days, 3 months, 6 months, 1 year, or Unlimited.

You can retrieve the following:

• Messages
• Message actions
• File Sharing (using File Sharing API)

Fetch History

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.

This function fetches historical messages from one or multiple channels. The includeMessageActions flag also allows you to fetch message actions along with the messages.

It's possible to control how messages are returned and in what order.

• if you specify only the start parameter (without end), you will receive messages that are older than the start timetoken
• if you specify only the end parameter (without start), you will receive messages from that end timetoken and newer
• if you specify values for both start and end parameters, you will retrieve messages between those timetokens (inclusive of the end value)

You will receive a maximum of 100 messages for a single channel or 25 messages for multiple channels (up to 500). If more messages meet the timetoken criteria, make iterative calls while adjusting the start timetoken to fetch the entire list of messages from Message Persistence.

Method(s)

To run Fetch History, you can use the following method(s) in the Unity SDK:

pubnub.FetchHistory()
    .Channels(string[])
    .IncludeMeta(bool)
    .IncludeMessageType(bool)
    .IncludeUUID(bool)
    .IncludeMessageActions(bool)
    .Reverse(bool)
    .Start(int)
    .End(int)
    .MaximumPerChannel(int)
    .QueryParam(Dictionary<string, object>)

Parameter	Type	Required	Description
Channels	string[]	Yes	Specifies channel to return history messages from. Maximum of 500 channels are allowed.
IncludeMeta	bool	Optional	Whether meta (passed when Publishing the message) should be included in response or not.
IncludeMessageType	bool	Optional	Pass true to receive the message type with each history message. Default is true.
IncludeUUID	bool	Optional	Pass true to receive the publisher uuid with each history message. Default is true.
IncludeMessageActions	bool	Optional	The flag denoting to retrieve history messages with message actions. If true, the method is limited to one channel and 25 messages only. Default is false.
Reverse	bool	Optional	Setting to true will traverse the time line in reverse starting with the oldest message first.
Start	long	Optional	Timetoken delimiting the start of time slice (exclusive) to pull messages from.
End	long	Optional	Timetoken delimiting the end of time slice (inclusive) to pull messages from.
MaximumPerChannel	int	Optional	Specifies the number of historical messages to return. Default and maximum is 100 for a single channel, 25 for multiple channels, and 25 if IncludeMessageActions is true.
QueryParam	Dictionary<string, object>	Optional	QueryParam accepts a Dictionary object, the keys and values are passed as the query string parameters of the URL called by the API.
Execute	System.Action	Yes	System.Action of type PNFetchHistoryResult.
ExecuteAsync	None	Optional	Returns Task<PNResult<PNFetchHistoryResult>>.

Truncated response

If you fetch messages with messages actions, the number of messages in the response may be truncated when internal limits are hit. If the response is truncated, a more property will be returned with additional parameters. Send iterative calls to history adjusting the parameters to fetch more messages.

Basic Usage

Retrieve the last message on a channel:

PNResult<PNFetchHistoryResult> fetchHistoryResponse = await pubnub.FetchHistory()
    .Channels(new string[] { "my_channel" })
    .IncludeMeta(true)
    .MaximumPerChannel(25)
    .ExecuteAsync();

Returns

The FetchHistory() operation returns a PNFetchHistoryResult that contains the following properties :

Property Name	Type	Description
Messages	Dictionary<string, List<PNHistoryItemResult>>	List of messages.
More	MoreInfo	Pagination information.

The Messages has the following properties:

Property Name	Type	Description
→  Channel Name	string	Name of the channel for which FetchHistory() has been executed.
→  →  Timetoken	long	Timetoken associated with the message.
→  →  Entry	object	Payload of the message.
→  →  Meta	object	Metadata associated with the message.
→  →  Uuid	string	UUID associated with the message.
→  →  MessageType	string	MessageType associated with the message.
→  →  Actions	object	Message Reactions associated with the message.

The More has following properties:

Property Name	Type	Description
→  →  Start	long	Timetoken denoting the start of the requested range.
→  →  End	long	Timetoken denoting the end of the requested range.
→  →  Limit	int	Number of messages returned in response.

{
    "Messages":
        {
            "my_channel":
            [{
                "Timetoken":15717278253295153,
                "Entry":"sample message",
                "Meta":"",
                "Uuid":"user-1",
                "MessageType":null,
                "Actions":null
            }]
        },
    "More":null
}

Other Examples

Retrieve the last 25 messages on a channel synchronously

pubnub.FetchHistory()
    .Channels(new string[] { "my_channel" })
    .IncludeMeta(true)
    .MaximumPerChannel(25)
    .Execute(new PNFetchHistoryResultExt((result, status) =>
    {

    }));

Delete Messages from History

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.

Removes the messages from the history of a specific channel.

Required setting

There is a setting to accept delete from history requests for a key, which you must enable by checking the Enable Delete-From-History checkbox in the key settings for your key in the Admin Portal.

Method(s)

To Delete Messages from History you can use the following method(s) in the Unity SDK.

pubnub.DeleteMessages()
    .Channel(string)
    .Start(long)
    .End(long)
    .QueryParam(Dictionary<string,object>)

Parameter	Type	Required	Description
Channel	string	Yes	Specifies channel messages to be deleted from history.
Start	long	Optional	Timetoken delimiting the Start of time slice (inclusive) to delete messages from.
End	long	Optional	Timetoken delimiting the End of time slice (exclusive) to delete messages from.
QueryParam	Dictionary<string, object>	Optional	Dictionary object to pass name/value pairs as query string params with PubNub URL request for debug purpose.
Async	PNCallback	Deprecated	PNCallback of type PNDeleteMessageResult.
Execute	System.Action	Yes	System.Action of type PNDeleteMessageResult.
ExecuteAsync	None	Optional	Returns Task<PNResult<PNDeleteMessageResult>>.

Basic Usage

PNResult<PNDeleteMessageResult> delMsgResponse = await pubnub.DeleteMessages()
    .Channel("history_channel")
    .Start(15088506076921021)
    .End(15088532035597390)
    .ExecuteAsync();

PNDeleteMessageResult delMsgResult = delMsgResponse.Result;
PNStatus status = delMsgResponse.Status;

if (status != null && status.Error)
{
    //Check for any error
    Debug.Log(status.ErrorData.Information);
}
else if (delMsgResult != null)

show all 19 lines

Returns

The DeleteMessages() operation returns a PNResult<PNDeleteMessageResult> which returns empty PNDeleteMessageResult object.

Other Examples

Delete messages sent in a particular timeframe

pubnub.DeleteMessages()
    .Channel("history_channel")
    .Start(15088506076921021)
    .End(15088532035597390)
    .Execute(new PNDeleteMessageResultExt(
        (result, status) => {
            if (status != null && status.Error) {
                //Check for any error
                Debug.Log(status.ErrorData.Information);
            }
            else if (result != null) {
                //Expect empty object
                Debug.Log(pubnub.JsonPluggableLibrary.SerializeToJsonString(result));
            }
        }

show all 16 lines

Delete specific message from history

To delete a specific message, pass the publish timetoken (received from a successful publish) in the End parameter and timetoken +/- 1 in the Start parameter. For example, if 15526611838554310 is the publish timetoken, pass 15526611838554309 in Start and 15526611838554310 in End parameters respectively as shown in the following code snippet.

PNResult<PNDeleteMessageResult> delMsgResponse = await pubnub.DeleteMessages()
    .Channel("history_channel")
    .Start(15526611838554310)
    .End(15526611838554309)
    .ExecuteAsync();

PNDeleteMessageResult delMsgResult = delMsgResponse.Result;
PNStatus status = delMsgResponse.Status;

if (status != null && status.Error)
{
    //Check for any error
    Debug.Log(status.ErrorData.Information);
}
else if (delMsgResult != null)

show all 19 lines

Message Counts

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.

Returns the number of messages published on one or more channels since a given time. The count returned is the number of messages in history with a timetoken value greater than or equal to than the passed value in the ChannelsTimetokenparameter.

Unlimited message retention

For keys with unlimited message retention enabled, this method considers only messages published in the last 30 days.

Method(s)

You can use the following method(s) in the Unity SDK:

pubnub.MessageCounts()
    .Channels(string[])
    .ChannelsTimetoken(long[])
    .QueryParam(Dictionary<string, object>)

Parameter	Type	Required	Description
Channels	string[]	Yes	The channels to fetch the message count
ChannelsTimetoken	long[]	Yes	Array of timetokens, in order of the channels list. Specify a single timetoken to apply it to all channels. Otherwise, the list of timetokens must be the same length as the list of channels, or the function returns a PNStatuswith an error flag.
QueryParam	Dictionary<string, object>	Optional	Dictionary object to pass name/value pairs as query string params with PubNub URL request for debug purpose.
Async	PNCallback	Deprecated	PNCallback of type PNMessageCountResult.
Execute	System.Action	Yes	System.Action of type PNMessageCountResult.
ExecuteAsync	None	Optional	Returns Task<PNResult<PNMessageCountResult>>.

Basic Usage

PNResult<PNMessageCountResult> msgCountResponse = await pubnub.MessageCounts()
    .Channels(new string[] { "message_count_channel" })
    .ChannelsTimetoken(new long[] { 15088506076921021 })
    .ExecuteAsync();

PNMessageCountResult msgCountResult = msgCountResponse.Result;
PNStatus status = msgCountResponse.Status;

if (status != null && status.Error)
{
    //Check for any error
    Debug.Log(status.ErrorData.Information);
}
else
{

show all 17 lines

Returns

The operation returns a PNResult<PNMessageCountResult> which contains the following operations:

Property Name	Type	Description
Result	PNMessageCountResult	Returns a PNMessageCountResult object.
Status	PNStatus	Returns a PNStatus object

PNMessageCountResult contains the following properties:

Property Name	Type	Description
Channels	Dictionary<string, long>	Collection of channels along with the messages count. channels without messages have a count of 0. channels with 10,000 messages or more have a count of 10000.

Other Examples

Retrieve count of messages for a single channel

pubnub.MessageCounts()
    .Channels(new string[] { "message_count_channel" })
    .ChannelsTimetoken(new long[] { 15088506076921021 })
    .Execute(new PNMessageCountResultExt(
    (result, status) => {
        if (status != null && status.Error)
        {
            //Check for any error
            Debug.Log(status.ErrorData.Information);
        }
        else
        {
            Debug.Log(pubnub.JsonPluggableLibrary.SerializeToJsonString(result));
        }
    }));

Retrieve count of messages using different timetokens for each channel

PNResult<PNMessageCountResult> msgCountResponse = await pubnub.MessageCounts()
    .Channels(new string[] { "message_count_channel", "message_count_channel2" })
    .ChannelsTimetoken(new long[] { 15088506076921021, 15088506076921131 })
    .ExecuteAsync();

PNMessageCountResult msgCountResult = msgCountResponse.Result;
PNStatus status = msgCountResponse.Status;

if (status != null && status.Error)
{
    //Check for any error
    Debug.Log(status.ErrorData.Information);
}
else
{

show all 17 lines