Go V4 Configuration API Reference for Realtime Apps

Go V4 complete API reference for building Realtime Applications on PubNub, including basic usage and sample code. View on GoDoc

Configuration

Description

pubnub.Config instance is storage for user-provided information which describe further PubNub client behavior. Configuration instance contain additional set of properties which allow to perform precise PubNub client configuration.

Method(s)

To create configuration instance you can use the following function in the Go V4 SDK:

config := pubnub.NewConfig()

Parameter	Type	Required	Defaults	Description
`SubscribeKey`	string	Yes		`SubscribeKey` from Admin Portal.
`PublishKey`	string	Optional	None	`PublishKey` from Admin Portal (only required if publishing).
`SecretKey`	string	Optional	None	`SecretKey` (only required for modifying/revealing access permissions).
`CipherKey`	string	Optional	None	If `CipherKey` is passed, all communications to/from PubNub will be encrypted.
`UUID`	string	Yes	SDK generated UUID	`UUID` to use. You should set a unique `UUID` to identify the user or the device that connects to PubNub. Allowing the SDK to generate a random `UUID` can result in significant billing impacts, particularly on an MAU pricing plan.
`AuthKey`	string	Optional	None	If Access Manager is utilized, client will use this `AuthKey` in all restricted requests.
`Secure`	bool	Optional	True	Use `SSL`.
`MessageQueueOverflowCount`	int	Optional	100	When the limit is exceeded by the number of messages received in a single subscribe request, a status event `PNRequestMessageCountExceededCategory` is fired.
`ConnectTimeout`	int	Optional	5	How long to wait before giving up connection to client.The value is in seconds.
`SubscribeRequestTimeout`	int	Optional	310	How long to keep the `Subscribe` loop running before disconnect.The value is in seconds.
`NonSubscribeRequestTimeout`	int	Optional	10	On `Non subscribe` operations, how long to wait for server response.The value is in seconds.
`FilterExpression`	string	Optional	None	Feature to subscribe with a custom filter expression.
`Origin`	string	Optional	`ps.pndsn.com`	Custom `Origin` if needed.
`MaximumReconnectionRetries`	int	Optional	unlimited (-1)	The config sets how many times to retry to reconnect before giving up.
`setPresenceTimeout`	int	Optional	0	The setting with set the custom presence server timeout.The value is in seconds.
`setPresenceTimeoutWithCustomInterval`	int	Optional	0	The setting with set the custom presence server timeout along with the custom interval to send the ping back to the server.The value is in seconds.
`SuppressLeaveEvents`	bool	Optional		When `true` the SDK doesn't send out the `leave` requests.
`MaxIdleConnsPerHost`	int	Optional	30	Used to set the value of HTTP Transport's MaxIdleConnsPerHost.
`FileMessagePublishRetryLimit`	int	Optional	5	The number of tries made in case of Publish File Message failure.
`UseRandomInitializationVector`	bool	Optional	`false`	When `true` the `IV` will be random for all requests and not just file upload. When `false` the `IV` will be hardcoded for all requests except File Upload.

Basic Usage

Note

Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.

config := pubnub.NewConfig()

// SubscribeKey from Admin Portal
config.SubscribeKey = "SubscribeKey" // required

// PublishKey from Admin Portal (only required if publishing)
config.PublishKey = "PublishKey"

// SecretKey (only required for access operations, keep away from Android)
config.SecretKey = "SecretKey"

// if CipherKey is passed, all communicatons to/from pubnub will be encrypted
config.CipherKey = "cipherKey"

// UUID to be used as a device identifier, a default UUID is generated
// if not passed
config.UUID = "customUUID"

// use SSL.
config.Secure = true

// how long to wait before giving up connection to client
config.ConnectTimeout = 100

// how long to keep the subscribe loop running before disconnect
config.SubscribeRequestTimeout = 310

// on non subscribe operations, how long to wait for server response
config.NonSubscribeRequestTimeout = 300

// PSV2 feature to subscribe with a custom filter expression
config.FilterExpression = "such=wow"

// heartbeat notifications, by default, the SDK will alert on failed heartbeats.
// other options such as all heartbeats or no heartbeats are supported.
config.SetPresenceTimeoutWithCustomInterval(120,59);
config.SetPresenceTimeout(120);

Rest Response from Server

Configured and ready to use client configuration instance.

Proxy Configuration

The following sample configures a client to use a proxy for subscribe requests:

var pn *pubnub.PubNub
config = pubnub.NewConfig()
config.UseHTTP2 = false

pn = pubnub.NewPubNub(config)

transport := &http.Transport{
    MaxIdleConnsPerHost: pn.Config.MaxIdleConnsPerHost,
    Dial: (&net.Dialer{
        Timeout:   time.Duration(pn.Config.ConnectTimeout) * time.Second,
        KeepAlive: 30 * time.Minute,
    }).Dial,
    ResponseHeaderTimeout: time.Duration(pn.Config.SubscribeRequestTimeout) * time.Second,
}
proxyURL, err := url.Parse(fmt.Sprintf("http://%s:%s@%s:%d", "proxyUser", "proxyPassword", "proxyServer", 8080))

if err == nil {
    transport.Proxy = http.ProxyURL(proxyURL)
} else {
    fmt.Printf("ERROR: creatSubHTTPClient: Proxy connection error: %s", err.Error())
}
c := pn.GetSubscribeClient()
c.Transport = transport
pn.SetSubscribeClient(c)

The following sample configures a client to use a proxy for non-subscribe requests:

var pn *pubnub.PubNub
config = pubnub.NewConfig()
config.UseHTTP2 = false

pn = pubnub.NewPubNub(config)

transport := &http.Transport{
    MaxIdleConnsPerHost: pn.Config.MaxIdleConnsPerHost,
    Dial: (&net.Dialer{
        Timeout:   time.Duration(pn.Config.ConnectTimeout) * time.Second,
        KeepAlive: 30 * time.Minute,
    }).Dial,
    ResponseHeaderTimeout: time.Duration(pn.Config.NonSubscribeRequestTimeout) * time.Second,
}
proxyURL, err := url.Parse(fmt.Sprintf("http://%s:%s@%s:%d", "proxyUser", "proxyPassword", "proxyServer", 8080))

if err == nil {
    transport.Proxy = http.ProxyURL(proxyURL)
} else {
    fmt.Printf("ERROR: createNonSubHTTPClient: Proxy connection error: %s", err.Error())
}
c := pn.GetClient()
c.Transport = transport
pn.SetClient(c)

Initialization

Add PubNub to your project using one of the procedures defined under How to Get It

Description

This function is used for initializing the PubNub Client API context. This function must be called before attempting to utilize any API functionality in order to establish account level credentials such as PublishKey and SubscribeKey.

Method(s)

To Initialize PubNub you can use the following method(s) in the Go V4 SDK:

```
pn := pubnub.NewPubNub(config)
```
Parameter Type Required Description

config Config Yes Goto Configuration for more details.

Parameter	Type	Required	Description
`config`	Config	Yes	Goto Configuration for more details.

Basic Usage

Initialize the PubNub client API:

Note

import (
    pubnub "github.com/pubnub/go"
)

config := pubnub.NewConfig()
config.PublishKey = "my-pub-key"
config.SubscribeKey = "my-sub-key"
config.UUID = "myUniqueUUID"
pn := pubnub.NewPubNub(config)

Returns

It returns the PubNub instance for invoking PubNub APIs like Publish(), Subscribe(), History(), HereNow(), etc.

Other Examples

Initialize a non-secure client:

Note

Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.
```
import (
    pubnub "github.com/pubnub/go"
)

config := pubnub.NewConfig()
config.PublishKey = "my-pub-key"
config.SubscribeKey = "my-sub-key"
config.UUID = "myUniqueUUID"

pn := pubnub.NewPubNub(config)
```
Initialization for a Read-Only client:

In the case where a client will only read messages and never publish to a channel, you can simply omit the PublishKey when initializing the client:

Note

Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.
```
import (
    pubnub "github.com/pubnub/go"
)

config := pubnub.NewConfig()
config.SubscribeKey = "my-sub-key"

pn := pubnub.NewPubNub(config)
```
Use a custom UUID

Set a custom UUID to identify your users.

Note

Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.
```
import (
    pubnub "github.com/pubnub/go"
)

config := pubnub.NewConfig()
config.PublishKey = "myPublishKey"
config.SubscribeKey = "mySubscribeKey"
config.UUID = "myUniqueUUID"

pn := pubnub.NewPubNub(config)
```

Event Listeners

Description

You can be notified of connectivity status, message and presence notifications via the listeners.

Listeners should be added before calling the method.

Adding Listeners

import (
    pubnub "github.com/pubnub/go"
)

listener := pubnub.NewListener()

go func() {
    for {
        select {
        case signal := <-listener.Signal:
            //Channel
            fmt.Println(signal.Channel)
            //Subscription
            fmt.Println(signal.Subscription)
            //Payload
            fmt.Println(signal.Message)
            //Publisher ID
            fmt.Println(signal.Publisher)
            //Timetoken
            fmt.Println(signal.Timetoken)
        case status := <-listener.Status:
            switch status.Category {
            case pubnub.PNDisconnectedCategory:
                // this is the expected category for an unsubscribe. This means there
                // was no error in unsubscribing from everything
            case pubnub.PNConnectedCategory:
                // this is expected for a subscribe, this means there is no error or issue whatsoever
            case pubnub.PNReconnectedCategory:
                // this usually occurs if subscribe temporarily fails but reconnects. This means
                // there was an error but there is no longer any issue
            case pubnub.PNAccessDeniedCategory:
                // this means that PAM does allow this client to subscribe to this
                // channel and channel group configuration. This is another explicit error
            }
        case message := <-listener.Message:
            //Channel
            fmt.Println(message.Channel)
            //Subscription
            fmt.Println(message.Subscription)
            //Payload
            fmt.Println(message.Message)
            //Publisher ID
            fmt.Println(message.Publisher)
            //Timetoken
            fmt.Println(message.Timetoken)
        case presence := <-listener.Presence:
            fmt.Println(presence.Event)
            //Channel
            fmt.Println(presence.Channel)
            //Subscription
            fmt.Println(presence.Subscription)
           //Timetoken
            fmt.Println(presence.Timetoken)
           //Occupancy
            fmt.Println(presence.Occupancy)
        case uuidEvent := <-listener.UUIDEvent:
            fmt.Println(fmt.Sprintf("uuidEvent.Channel: %s", uuidEvent.Channel))
            fmt.Println(fmt.Sprintf("uuidEvent.SubscribedChannel: %s", uuidEvent.SubscribedChannel))
            fmt.Println(fmt.Sprintf("uuidEvent.Event: %s", uuidEvent.Event))
            fmt.Println(fmt.Sprintf("uuidEvent.UUID: %s", uuidEvent.UUID))
            fmt.Println(fmt.Sprintf("uuidEvent.Description: %s", uuidEvent.Description))
            fmt.Println(fmt.Sprintf("uuidEvent.Timestamp: %s", uuidEvent.Timestamp))
            fmt.Println(fmt.Sprintf("uuidEvent.Name: %s", uuidEvent.Name))
            fmt.Println(fmt.Sprintf("uuidEvent.ExternalID: %s", uuidEvent.ExternalID))
            fmt.Println(fmt.Sprintf("uuidEvent.ProfileURL: %s", uuidEvent.ProfileURL))
            fmt.Println(fmt.Sprintf("uuidEvent.Email: %s", uuidEvent.Email))
            fmt.Println(fmt.Sprintf("uuidEvent.Updated: %s", uuidEvent.Updated))
            fmt.Println(fmt.Sprintf("uuidEvent.ETag: %s", uuidEvent.ETag))
            fmt.Println(fmt.Sprintf("uuidEvent.Custom: %v", uuidEvent.Custom))
        case channelEvent := <-listener.ChannelEvent:
            fmt.Println(fmt.Sprintf("channelEvent.Channel: %s", channelEvent.Channel))
            fmt.Println(fmt.Sprintf("channelEvent.SubscribedChannel: %s", channelEvent.SubscribedChannel))
            fmt.Println(fmt.Sprintf("channelEvent.Event: %s", channelEvent.Event))
            fmt.Println(fmt.Sprintf("channelEvent.Channel: %s", channelEvent.Channel))
            fmt.Println(fmt.Sprintf("channelEvent.Description: %s", channelEvent.Description))
            fmt.Println(fmt.Sprintf("channelEvent.Timestamp: %s", channelEvent.Timestamp))
            fmt.Println(fmt.Sprintf("channelEvent.Updated: %s", channelEvent.Updated))
            fmt.Println(fmt.Sprintf("channelEvent.ETag: %s", channelEvent.ETag))
            fmt.Println(fmt.Sprintf("channelEvent.Custom: %v", channelEvent.Custom))
        case membershipEvent := <-listener.MembershipEvent:
            fmt.Println(fmt.Sprintf("membershipEvent.Channel: %s", membershipEvent.Channel))
            fmt.Println(fmt.Sprintf("membershipEvent.SubscribedChannel: %s", membershipEvent.SubscribedChannel))
            fmt.Println(fmt.Sprintf("membershipEvent.Event: %s", membershipEvent.Event))
            fmt.Println(fmt.Sprintf("membershipEvent.Channel: %s", membershipEvent.Channel))
            fmt.Println(fmt.Sprintf("membershipEvent.UUID: %s", membershipEvent.UUID))
            fmt.Println(fmt.Sprintf("membershipEvent.Description: %s", membershipEvent.Description))
            fmt.Println(fmt.Sprintf("membershipEvent.Timestamp: %s", membershipEvent.Timestamp))
            fmt.Println(fmt.Sprintf("membershipEvent.Custom: %v", membershipEvent.Custom))
        case messageActionsEvent := <-listener.MessageActionsEvent:
            fmt.Println(fmt.Sprintf("messageActionsEvent.Channel: %s", messageActionsEvent.Channel))
            fmt.Println(fmt.Sprintf("messageActionsEvent.SubscribedChannel: %s", messageActionsEvent.SubscribedChannel))
            fmt.Println(fmt.Sprintf("messageActionsEvent.Event: %s", messageActionsEvent.Event))
            fmt.Println(fmt.Sprintf("messageActionsEvent.Data.ActionType: %s", messageActionsEvent.Data.ActionType))
            fmt.Println(fmt.Sprintf("messageActionsEvent.Data.ActionValue: %s", messageActionsEvent.Data.ActionValue))
            fmt.Println(fmt.Sprintf("messageActionsEvent.Data.ActionTimetoken: %s", messageActionsEvent.Data.ActionTimetoken))
            fmt.Println(fmt.Sprintf("messageActionsEvent.Data.MessageTimetoken: %s", messageActionsEvent.Data.MessageTimetoken))
        case file := <-listener.File:
            fmt.Println(fmt.Sprintf("file.File.PNMessage.Text: %s", file.File.PNMessage.Text))
            fmt.Println(fmt.Sprintf("file.File.PNFile.Name: %s", file.File.PNFile.Name))
            fmt.Println(fmt.Sprintf("file.File.PNFile.ID: %s", file.File.PNFile.ID))
            fmt.Println(fmt.Sprintf("file.File.PNFile.URL: %s", file.File.PNFile.URL))
            fmt.Println(fmt.Sprintf("file.Channel: %s", file.Channel))
            fmt.Println(fmt.Sprintf("file.Timetoken: %d", file.Timetoken))
            fmt.Println(fmt.Sprintf("file.SubscribedChannel: %s", file.SubscribedChannel))
            fmt.Println(fmt.Sprintf("file.Publisher: %s", file.Publisher))
        }
    }
}()

Removing Listeners

listener := pubnub.NewListener()

pn.AddListener(listener)

// some time later
pn.RemoveListener(listener)

Handling Disconnects

import (
    pubnub "github.com/pubnub/go"
)

 go func() {
    for {
        select {
        case status := <-listener.Status:
            switch status.Category {
            case pubnub.PNDisconnectedCategory:
                // handle disconnect here
            }
        case <-listener.Message:
        case <-listener.Presence:
        }
    }
}()

Listener status events

Category	Description
`PNTimeoutCategory`	Processing has failed because of request time out.
`PNDisconnectedCategory`	The SDK is not able to reach the PubNub Data Stream Network because the machine or device are not connected to Internet or this has been lost, your ISP (Internet Service Provider) is having to troubles or perhaps or the SDK is behind of a proxy.
`PNConnectedCategory`	SDK subscribed with a new mix of channels (fired every time the channel / channel group mix changed).
`PNAccessDeniedCategory`	The SDK will announce this error when the PAM (PubNub Access Manager) does not allow the subscription to a channel or a channel group.
`PNBadRequestCategory`	PubNub API server was unable to parse SDK request correctly.
`PNCancelledCategory`	Request was cancelled by user.
`PNLoopStopCategory`	Subscription loop has been stopped due some reasons.
`PNReconnectedCategory`	Subscription loop has been reconnected due some reasons.
`PNAcknowledgmentCategory`	PNAcknowledgmentCategory as the StatusCategory is the Acknowledgement of an operation (like Unsubscribe).
`PNReconnectionAttemptsExhausted`	The SDK loop has been stopped due maximum reconnection exhausted.
`PNNoStubMatchedCategory/PNUnknownCategory`	PNNoStubMatchedCategory as the StatusCategory means an unknown status category event occurred.
`PNRequestMessageCountExceededCategory`	`PNRequestMessageCountExceededCategory` is fired when the `MessageQueueOverflowCount` limit is exceeded by the number of messages received in a single subscribe request.

UUID

Description

These functions are used to set/get a user ID on the fly.

Method(s)

To set/get UUID you can use the following method(s) in Go V4 SDK:

```
config.UUID = string
```
Parameter Type Required Default Description

UUID string Yes SDK generated UUID UUID to be used as a device identifier, a default UUID is generated if not passed.
config.UUID

This method doesn't take any arguments.

Parameter	Type	Required	Default	Description
`UUID`	string	Yes	`SDK generated UUID`	`UUID` to be used as a device identifier, a default `UUID` is generated if not passed.

Basic Usage

Set UUID:

Note

import (
    pubnub "github.com/pubnub/go"
)

config := pubnub.NewConfig()

config.UUID = "myUniqueUUID"

Get UUID:

import (
    pubnub "github.com/pubnub/go"
)

config := pubnub.NewConfig()

fmt.Println(config.UUID)

Authentication Key

Description

Setter and getter for users auth key.

Method(s)

```
config.AuthKey = string
```
Parameter Type Required Description

AuthKey string Yes If Access Manager is utilized, client will use this AuthKey in all restricted requests.
```
config.AuthKey
```

Parameter	Type	Required	Description
`AuthKey`	string	Yes	If Access Manager is utilized, client will use this `AuthKey` in all restricted requests.

This method doesn't take any arguments.

Basic Usage

Set Auth Key

import (
    pubnub "github.com/pubnub/go"
)

config := pubnub.NewConfig()

config.AuthKey = "my_newauthkey"

Get Auth Key

fmt.Println(config.AuthKey)

Returns

None.

Filter Expression

Requires Stream Controller add-onRequires that the Stream Controller add-on is enabled for your key. See this page on enabling add-on features on your keys:
https://support.pubnub.com/hc/en-us/articles/360051974791-How-do-I-enable-add-on-features-for-my-keys-

Description

Stream filtering allows a subscriber to apply a filter to only receive messages that satisfy the conditions of the filter. The message filter is set by the subscribing client(s) but it is applied on the server side thus preventing unwanted messages (those that do not meet the conditions of the filter) from reaching the subscriber.

To set/get filters you can use the following methods. To learn more about filtering, refer to the Publish Messages documentation.

Method(s)

```
config.FilterExpression = string
```
Parameter Type Required Description

filterExpression string Yes PSV2 feature to Subscribe with a custom filter expression.
```
config.FilterExpression
```
This method doesn't take any arguments.

Parameter	Type	Required	Description
`filterExpression`	string	Yes	PSV2 feature to `Subscribe` with a custom filter expression.

Basic Usage

Set Filter Expression

Note

import (
    pubnub "github.com/pubnub/go"
)

config := pubnub.NewConfig()

config.FilterExpression = "such=wow"

Get Filter Expression

fmt.Println(config.FilterExpression)