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Message Persistence API for Unity SDK

Message Persistence gives you real-time access to the history of messages published to PubNub. Each message is timestamped to the nearest 10 nanoseconds and stored across multiple availability zones in several geographic locations. You can encrypt stored messages with AES-256 so they are not readable on PubNub’s network. For details, see Message Persistence.

You control how long messages are stored through your account’s retention policy. Options include: 1 day, 7 days, 30 days, 3 months, 6 months, 1 year, or Unlimited.

You can retrieve the following:

  • Messages
  • Message reactions
  • Files (using the File Sharing API)

Fetch history​

Requires Message Persistence

This method requires that Message Persistence is enabled for your key in the Admin Portal.

Fetch historical messages from one or more channels. Use includeMessageActions to include message actions.

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

  • If you specify only the start parameter (without end), you receive messages older than the start timetoken.
  • If you specify only the end parameter (without start), you receive messages from that end timetoken and newer.
  • If you specify both start and end, you receive messages between those timetokens (inclusive of end).

This function returns up to 100 messages on a single channel, or 25 per channel on up to 500 channels. To page, iteratively update the start timetoken.

Method(s)​

Use the following method(s) in the Unity SDK:

1pubnub.FetchHistory()
2    .Channels(string[])
3    .IncludeMeta(bool)
4    .IncludeMessageType(bool)
5    .IncludeCustomMessageType(bool)
6    .IncludeUUID(bool)
7    .IncludeMessageActions(bool)
8    .Reverse(bool)
9    .Start(int)
10    .End(int)
11    .MaximumPerChannel(int)
12    .QueryParam(Dictionary<string, object>)
* required
ParameterDescription
Channels *
Type: string[]
Specifies channel to return history messages from. Maximum of 500 channels are allowed.
IncludeMeta
Type: bool
Whether meta (passed when Publishing the message) should be included in response or not.
IncludeMessageType
Type: bool
Pass true to receive the message type with each history message. Default is true.
IncludeCustomMessageType
Type: bool
Indicates whether to retrieve messages with the custom message type.

For more information, refer to Retrieving Messages.
IncludeUUID
Type: bool
Pass true to receive the publisher uuid with each history message. Default is true.
IncludeMessageActions
Type: bool
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
Type: bool
Setting to true will traverse the time line in reverse starting with the oldest message first.
Start
Type: long
timetoken delimiting the start of time slice (exclusive) to pull messages from.
End
Type: long
timetoken delimiting the end of time slice (inclusive) to pull messages from.
MaximumPerChannel
Type: int
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
Type: Dictionary<string, object>
QueryParam accepts a Dictionary object, the keys and values are passed as the query string parameters of the URL called by the API.
Execute *
Type: System.Action
System.Action of type PNFetchHistoryResult.
ExecuteAsync
Type: None
Returns Task<PNResult<PNFetchHistoryResult>>.
Truncated response

If truncated, a more property will be returned with additional parameters. Make iterative calls adjusting parameters.

Sample code​

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.

Retrieve the last message on a channel:

1

Returns​

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

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

The Messages has the following properties:

Property NameTypeDescription
 →  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.
 →  →  CustomMessageType
string
The custom message type associated with the message.
 →  →  Actions
object
Message Actions associated with the message.

The More has following properties:

Property NameTypeDescription
 →  →  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.
1{
2    "Messages":
3        {
4            "my_channel":
5            [{
6                "Timetoken":15717278253295153,
7                "Entry":"sample message",
8                "Meta":"",
9                "Uuid":"user-1",
10                "MessageType":null,
11                "Actions":null
12            }]
13        },
14    "More":null
15}

Other examples​

Retrieve the last 25 messages on a channel synchronously​

1

Delete messages from history​

Requires Message Persistence

This method requires that Message Persistence is enabled for your key in the Admin Portal.

Removes the messages from the history of a specific channel.

Required setting

Enable Delete-From-History in key settings and initialize with a secret key.

Method(s)​

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

1pubnub.DeleteMessages()
2    .Channel(string)
3    .Start(long)
4    .End(long)
5    .QueryParam(Dictionary<string,object>)
* required
ParameterDescription
Channel *
Type: string
Specifies channel messages to be deleted from history.
Start
Type: long
timetoken delimiting the Start of time slice (inclusive) to delete messages from.
End
Type: long
timetoken delimiting the End of time slice (exclusive) to delete messages from.
QueryParam
Type: Dictionary<string, object>
Dictionary object to pass name/value pairs as query string params with PubNub URL request for debug purpose.
Async
Type: PNCallback
PNCallback of type PNDeleteMessageResult.
Execute *
Type: System.Action
System.Action of type PNDeleteMessageResult.
ExecuteAsync
Type: None
Returns Task<PNResult<PNDeleteMessageResult>>.

Sample code​

1

Returns​

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

Other examples​

Delete messages sent in a particular timeframe​

1

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.

1

Message counts​

Requires Message Persistence

This method requires that Message Persistence is enabled for your key in the Admin Portal.

Return the number of messages published since the given time; the count is messages with timetoken ≥ the provided value.

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:

1pubnub.MessageCounts()
2    .Channels(string[])
3    .ChannelsTimetoken(long[])
4    .QueryParam(Dictionary<string, object>)
* required
ParameterDescription
Channels *
Type: string[]
The channels to fetch the message count
ChannelsTimetoken *
Type: long[]
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 PNStatus with an error flag.
QueryParam
Type: Dictionary<string, object>
Dictionary object to pass name/value pairs as query string params with PubNub URL request for debug purpose.
Async
Type: PNCallback
PNCallback of type PNMessageCountResult.
Execute *
Type: System.Action
System.Action of type PNMessageCountResult.
ExecuteAsync
Type: None
Returns Task<PNResult<PNMessageCountResult>>.

Sample code​

1

Returns​

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

Property NameTypeDescription
Result
PNMessageCountResult
Returns a PNMessageCountResult object.
Status
PNStatus
Returns a PNStatus object

PNMessageCountResult contains the following properties:

Property NameTypeDescription
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​

1

Retrieve count of messages using different timetokens for each channel​

1
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