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 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.
Description
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 (withoutend
), you will receive messages that are older than thestart
timetoken - if you specify only the
end
parameter (withoutstart
), you will receive messages from thatend
timetoken and newer - if you specify values for both
start
andend
parameters, you will retrieve messages between those timetokens (inclusive of theend
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 V4 SDK:
pubnub.FetchMessages().Channels(List<string>).Count(int).Reverse(bool).IncludeMeta(bool).IncludeMessageActions(bool).Start(long).End(long).QueryParam(Dictionary<string,string>).Async()
Parameter | Type | Required | Default | Description |
---|---|---|---|---|
Channels | List<string> | Yes | Specifies channel to return history messages from. Maximum of 500 channels are allowed. | |
Count | int | Optional | 100 or 25 | 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 . |
Reverse | bool | Optional | false | Setting to true will traverse the time line in reverse starting with the oldest message first. |
IncludeMeta | bool | Optional | false | Whether meta (passed when Publishing the message) should be included in response or not. |
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. | |
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. | |
QueryParam | Dictionary<string, string> | Optional | QueryParam accepts a Dictionary object, the keys and values are passed as the query string parameters of the URL called by the API. | |
Async | PNCallback | Yes | PNCallback of type PNHistoryResult . |
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:
pubnub.FetchMessages()
.Channels(new List<string>{"channel2"})
.Async ((result, status) => {
if(status.Error){
Debug.Log (string.Format(" FetchMessages Error: {0} {1} {2}", status.StatusCode, status.ErrorData, status.Category));
} else {
Debug.Log (string.Format("In FetchMessages, result: "));//,result.EndTimetoken, result.Messages[0].ToString()));
foreach(KeyValuePair<string, List<PNMessageResult>> kvp in result.Channels){
Debug.Log("kvp channelname" + kvp.Key);
foreach(PNMessageResult pnMessageResut in kvp.Value){
Debug.Log("Channel: " + pnMessageResut.Channel);
Debug.Log("payload: " + pnMessageResut.Payload.ToString());
Debug.Log("timetoken: " + pnMessageResut.Timetoken.ToString());
}
}
show all 17 linesReturns
The response is of the type PNFetchMessagesResult
.
Key | Value | Description |
---|---|---|
Channels | Dictionary<string, PNMessageResult > | The returned PNMessageResult is the same as the one returned by the subscribe operation. Refer to the Returns section of the Subscribe documentation for more information. |
More | Dictionary<string, object> | This field is returned when the server hasn't returned all messages. You should make another FetchMessages() call starting from start time and set the max value to max . If you want to use REST, you also need the url parameter. These three values are returned in the More field and you can access the using More["url"] . |
Delete Messages from History
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.
Description
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.
Requires Initialization with secret key.
Method(s)
To Delete Messages from History
you can use the following method(s) in the Unity V4 SDK.
pubnub.DeleteMessages().Channel(string).Start(long).End(long).QueryParam(Dictionary<string,string>).Async()
Parameter | Type | Required | Default | Description |
---|---|---|---|---|
Channels | string | Yes | Specifies channels to delete messages from. | |
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, string> | Optional | QueryParam accepts a Dictionary object, the keys and values are passed as the query string parameters of the URL called by the API. | |
Async | PNCallback | Yes | PNCallback of type PNDeleteMessagesResult . |
Basic Usage
pubnub.DeleteMessages()
.Channel("channel1")
.Start(15078932998876451)
.End(15078933628583256)
.Async((result, status) => {
if(!status.Error){
Debug.Log (string.Format("DateTime {0}, In DeleteMessages Example, Timetoken: {1}", DateTime.UtcNow , result.Message));
} else {
Debug.Log (status.Error);
Debug.Log (status.StatusCode);
Debug.Log (status.ErrorData.Info);
}
});
Returns
The DeleteMessages()
does not return actionable data, be sure to check the status object on the outcome of the operation by checking the status.IsError()
.
Other Examples
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. e.g. if 15526611838554310
is the publish timetoken
, pass 15526611838554309
in Start
and 15526611838554310
in End
parameters respectively as shown in the following code snippet.
pubnub.DeleteMessages()
.Channel("channel1")
.Start(15526611838554310)
.End(15526611838554309)
.Async((result, status) => {
if(!status.Error){
Debug.Log (string.Format("DateTime {0}, In DeleteMessages Example, Timetoken: {1}", DateTime.UtcNow , result.Message));
} else {
Debug.Log (status.Error);
Debug.Log (status.StatusCode);
Debug.Log (status.ErrorData.Info);
}
});
Message Counts
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.
Description
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 ChannelsTimetoken
parameter.
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 V4 SDK:
pubnub.MessageCounts().Channels(List<string>).ChannelsTimetoken(List<long>).Async()
Parameter | Type | Required | Default | Description |
---|---|---|---|---|
Channels | List<string> | Yes | The channels to fetch the message count | |
ChannelsTimetoken | List<long> | Yes | List 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 | Dictionary<string, string> | Optional | QueryParam accepts a Dictionary object, the keys and values are passed as the query string parameters of the URL called by the API. | |
Async | PNCallback | Yes | PNCallback of type PNMessageCountsResult . |
Basic Usage
pubnub.MessageCounts().
Channels(new List<string>{"channel2"}).
ChannelsTimetoken(new List<long>{155179501329433}).
Async((result, status) =>{
if(status.Error){
Debug.Log (string.Format("MessageCounts Error: {0} {1} {2}", status.StatusCode, status.ErrorData, status.Category));
} else {
Debug.Log(string.Format("MessageCounts," + result.Channels.Count));
foreach(KeyValuePair<string, int> kvp in result.Channels){
Display(string.Format("MessageCounts:-> {0}:{1}", kvp.Key, kvp.Value));
}
}
});
Returns
The operation returns a PNMessageCountsResult
which contains the following operations
Method | Type | Description |
---|---|---|
Channels | Dictionary<string, int> | Dictionary with key as channel name and value as the count of history messages. 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 using different timetokens for each channel
pubnub.MessageCounts().
Channels(new List<string>{"channel2"}).
ChannelsTimetoken(new List<long>{1551795013294,155179501329433})
Async((result, status) =>{
if(status.Error){
Debug.Log (string.Format("MessageCounts Error: {0} {1} {2}", status.StatusCode, status.ErrorData, status.Category));
} else {
Debug.Log(string.Format("MessageCounts," + result.Channels.Count));
foreach(KeyValuePair<string, int> kvp in result.Channels){
Display(string.Format("MessageCounts:-> {0}:{1}", kvp.Key, kvp.Value));
}
}
});
History (deprecated)
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.
Deprecated method
This method is deprecated. Use fetch history instead.
Description
This function fetches historical messages of a channel.
It is possible to control how messages are returned and in what order, for example you can:
- Search for messages starting on the newest end of the timeline (default behavior -
Reverse
=false
) - Search for messages from the oldest end of the timeline by setting
Reverse
totrue
. - Page through results by providing a
Start
OREnd
timetoken. - Retrieve a slice of the time line by providing both a
Start
ANDEnd
timetoken. - Limit the number of messages to a specific quantity using the
Count
parameter.
Start & End parameter usage clarity:
If only the Start
parameter is specified (without End
), you will receive messages that are older than and up to that Start
timetoken value. If only the End
parameter is specified (without Start
) you will receive messages that match that End
timetoken value and newer Specifying values for both Start
and End
parameters will return messages between those timetoken values (inclusive on the End
value). Keep in mind that you will still receive a maximum of 100 messages even if there are more messages that meet the timetoken values. Iterative calls to history adjusting the Start
timetoken is necessary to page through the full set of results if more than 100 messages meet the timetoken values.
Method(s)
To run History
you can use the following method(s) in the Unity V4 SDK:
pubnub.History().Channel(string).Count(int).Reverse(bool).IncludeTimetoken(bool).IncludeMeta(bool).Start(long).End(long).QueryParam(Dictionary<string,string>).Async()
Parameter | Type | Required | Default | Description |
---|---|---|---|---|
Channel | string | Yes | Specifies channel to return history messages from. | |
Count | int | Optional | 100 | Specifies the number of historical messages to return. |
Reverse | bool | Optional | false | Setting to true will traverse the time line in reverse starting with the oldest message first. |
IncludeTimetoken | bool | Optional | false | Whether event dates timetokens should be included in response or not. |
IncludeMeta | bool | Optional | false | Whether meta (passed when Publishing the message) should be included in response or not. |
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. | |
QueryParam | Dictionary<string, string> | Optional | QueryParam accepts a Dictionary object, the keys and values are passed as the query string parameters of the URL called by the API. | |
Async | PNCallback | Yes | PNCallback of type PNHistoryResult . |
Using the reverse
parameter:
reverse
parameter:Messages are always returned sorted in ascending time direction from history regardless of Reverse
. The Reverse
direction matters when you have more than 100 (or Count
, if it's set) messages in the time interval, in which case Reverse
determines the end of the time interval from which it should start retrieving the messages.
Basic Usage
Retrieve the last 100 messages on a channel:
pubnub.History()
.Channel("history_channel")
.Count(100)
.Async ((result, status) => {
if(status.Error){
Debug.Log (string.Format("History Error: {0} {1} {2}", status.StatusCode, status.ErrorData, status.Category));
} else {
foreach (PNHistoryItemResult histItem in result.Messages){
Debug.Log(string.Format("histItem: {0}, {1}", histItem.Entry.ToString(), histItem.Timetoken.ToString()));
}
}
});
Returns
The History()
operation returns a PNHistoryResult
which contains the following operations:
Method | Type | Description |
---|---|---|
Messages | List<PNHistoryItemResult > | List of messages of type PNHistoryItemResult . See PNHistoryItemResult for more details. |
StartTimetoken | long | Start timetoken . |
EndTimetoken | long | End timetoken . |
PNHistoryItemResult
Method | Type | Description |
---|---|---|
Timetoken | long | Timetoken of the message. |
Entry | object | Message. |
Meta | object | The meta data (if sent, when publishing the message). |
Other Examples
Use History() to retrieve the three oldest messages by retrieving from the time line in reverse
pubnub.History()
.Channel("my_channel")
.Count(3)
.Reverse(true)
.Async ((result, status) => {
if(status.Error){
Debug.Log (string.Format(" History Error: {0} {1} {2}", status.StatusCode, status.ErrorData, status.Category));
} else {
foreach (PNHistoryItemResult histItem in result.Messages){
Debug.Log(string.Format("histItem: {0}, {1}", histItem.Entry.ToString(), histItem.Timetoken.ToString()));
}
}
});
Response
if(!status.Error){
foreach (PNHistoryItemResult histItem in result.Messages){
Debug.Log(string.Format("histItem: {0}, {1}", histItem.Entry.ToString(), histItem.Timetoken.ToString()));
}
}
*Use History() to retrieve messages newer than a given timetoken by paging from oldest message to newest message starting at a single point in time (exclusive)
pubnub.History()
.Channel("my_channel")
.Start(13847168620721752L)
.Reverse(true)
.Async ((result, status) => {
if(status.Error){
Debug.Log (string.Format(" History Error: {0} {1} {2}", status.StatusCode, status.ErrorData, status.Category));
} else {
foreach (PNHistoryItemResult histItem in result.Messages){
Debug.Log(string.Format("histItem: {0}, {1}", histItem.Entry.ToString(), histItem.Timetoken.ToString()));
}
}
});
Response
if(!status.Error){
foreach (PNHistoryItemResult histItem in result.Messages){
Debug.Log(string.Format("histItem: {0}, {1}", histItem.Entry.ToString(), histItem.Timetoken.ToString()));
}
}
Use History() to retrieve messages until a given timetoken by paging from newest message to oldest message until a specific end point in time (inclusive)
pubnub.History()
.Channel("my_channel")
.Start(-1)
.End(13847168819178600L)
.Count(100)
.Reverse(true)
.Async ((result, status) => {
if(status.Error){
Debug.Log (string.Format(" History Error: {0} {1} {2}", status.StatusCode, status.ErrorData, status.Category));
} else {
foreach (PNHistoryItemResult histItem in result.Messages){
Debug.Log(string.Format("histItem: {0}, {1}", histItem.Entry.ToString(), histItem.Timetoken.ToString()));
}
}
});
Response
if(!status.Error){
foreach (PNHistoryItemResult histItem in result.Messages){
Debug.Log(string.Format("histItem: {0}, {1}", histItem.Entry.ToString(), histItem.Timetoken.ToString()));
}
}
History Paging Example
Usage
You can call the method by passing 0 or a valid timetoken as the argument.
void GetHistoryRecursive(long start, string channel) {
pubnub.History()
.Channel(channel)
.Start(start)
.Reverse(true)
.IncludeTimetoken(true)
.Async((result, status) => {
if (status.Error) {
Debug.Log(string.Format("In Example, History Error: {0} {1} {2}", status.StatusCode, status.ErrorData, status.Category));
} else {
if ((result.Messages!=null) && (result.Messages.Count>0)) {
foreach (PNHistoryItemResult histItem in result.Messages) {
Debug.Log(string.Format("histItem: {0}, {1}", histItem.Entry.ToString(), histItem.Timetoken.ToString()));
}
GetHistoryRecursive(result.EndTimetoken, channel);
show all 19 linesInclude timetoken in history response
pubnub.History()
.Channel("my_channel")
.IncludeTimetoken(true)
.Count(100)
.Async((result, status) => {
if(status.Error){
Debug.Log (string.Format(" History Error: {0} {1} {2}", status.StatusCode, status.ErrorData, status.Category));
} else {
foreach (PNHistoryItemResult histItem in result.Messages){
Debug.Log(string.Format("histItem: {0}, {1}", histItem.Entry.ToString(), histItem.Timetoken.ToString()));
}
}
});