messaging

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#PubNub 3.6 client for Go 1.0.3, 1.1, 1.3, 1.3.1, 1.4.2

###Important changes in this version: The package name has been modified to "messaging" from "pubnubMessaging".

###Change log

• 3.6.4

• Exposed MaxIdleConnsPerHost of the transport

• 3.6.3

• PAM operations (grant, revoke, audit) now return 403 errors in the Error Callback

• SetLogging method name changed to LoggingEnabled

• SetLogOutput added, you can customize the log output now

• Support to change uuid

• 3.6 features

• HereNow with state (here now's signature has changed, the response has also changed)

• WhereNow

• Global Here Now

• User State (Set, Get, Delete)

• Presence heartbeat

• Presence heartbeat interval

• These are converted to uint16

• nonSubscribeTimeout

• retryInterval

• connectTimeout

• subscribeTimeout

• Optimizations

###Earlier Features

• Supports multiplexing, UUID, SSL, Encryption, Proxy, and godoc
• This version is not backward compatible. The major change is in the func calls. A new parameter "error callback" is added to the major functions of the pubnub class.
• The client now supports:
• Error Callback: All the error messages are routed to this callback channel
• Resume on reconnect
• You can now "Subscribe with timetoken"
• An example of Disconnect/Retry has been added in the example
• Multiple messages received in a single response from the server will now be split into individual messages
• Non 200 response will now be bubbled to the client
• PAM: To use the PAM features in the example please enable PAM from the Pubnub admin console (https://admin.pubnub.com) and replace the publish, subscribe and secret keys in example/pubnubExample.go (line 124).

###Quick Start Video

We've put together a quick HOWTO video here http://vimeo.com/93523019

###Get Package

• Use the command go get github.com/pubnub/go/messaging to download and install the package

###Run the example

• Built using Eclipse IDE (juno)
• Install golang plugin for Eclipse
• Using Eclipse Project Explorer browse to the directory $GOPATH/src/github.com/pubnub/go/messaging/example, where $GOPATH is the workspaces directory of go.
• Run pubnubExample.go as a "go application"
• Look for the application in the "Console" of the Eclipse IDE

###Running Unit tests (instructions for Mac/Linux, for other dev environments the instructions are similar)

• Open Terminal.
• Change the directory to <eclipse-workspace>/src/github.com/pubnub/go/messaging/tests.
• Run the command go test -i to install the packages.
• And then run the command go test to run test cases.

###Use pubnub in your project

• Install golang plugin for Eclipse.
• Use the command go get github.com/pubnub/go/messaging to download and install the package.
• Open terminal/command prompt. Browse to the directory $GOPATH/src/github.com/pubnub/go/messaging/
• Run the command go install.
• Go to eclipse and create a new "go project". Enter the project name.
• Create a new "go file" in the "src" directory of the new project. For this example choose the "Command Source File" under the "Source File Type" with "Empty Main Function".
• Click Finish
• On this file in eclipse.
• Under import add the 2 lines

import (
    // Other imports...
    "fmt"
    "github.com/pubnub/go/messaging"
)

• And under main add the following line

fmt.Println("PubNub Api for go;", messaging.VersionInfo())

• Run the example as a "go application"
• This application will print the version info of the PubNub Api.
• For the detailed usage of the PunNub API, please refer to the rest of the ReadMe or the pubnubExample.go file under $GOPATH/src/github.com/pubnub/go/messaging/example

In addition to Eclipse, this has also been tested with Go 1.0.3 on Linux using IntelliJ IDEA 12.

###Demo Console App We've included a demo console app which documents all the functionality of the client, for example:

• Subscribe
• Subscribe with timetoken
• Publish
• Presence
• Detailed History
• Here_Now
• Unsubscribe
• Presence-Unsubscribe
• Time
• Disconnect/Retry
• GrantSubscribe
• RevokeSubscribe
• AuditSubscribe
• GrantPresence
• RevokePresence
• AuditPresence
• SetAuthKey
• GetAuthKey
• Exit
• Set Presence Heartbeat
• Set Presence Heartbeat Interval
• Set User State by adding or modifying the Key-Pair
• Delete an existing Key-Pair
• Set User State with JSON string
• Get User State
• WhereNow
• GlobalHereNow
• Change UUID

###Quick Implementation Examples

handleSubscribeResult

This function is a utility function used in the examples below to handle the Subscribe/Presence response. You will want to adapt it to your own needs.

func handleSubscribeResult(successChannel, errorChannel chan []byte, action string) {
    for {
        select {
        case success, ok := <-successChannel:
            if !ok {
				break
			}
			if string(success) != "[]" {
				fmt.Println(fmt.Sprintf("%s Response: %s ", action, success))
				fmt.Println("")
			}
        case failure, ok := <-errorChannel:
            if !ok {
				break
			}
            if string(failure) != "[]" {
				if displayError {
					fmt.Println(fmt.Sprintf("%s Error Callback: %s", action, failure))
					fmt.Println("")
				}
			}
        }
    }
}

handleResult

This function is a utility function used in the examples below to handle the non Subscribe/Presence response. You will want to adapt it to your own needs.

func handleResult(successChannel, errorChannel chan []byte, timeoutVal int64, action string) {
    timeout := make(chan bool, 1)
	go func() {
		time.Sleep(time.Duration(timeoutVal) * time.Second)
		timeout <- true
	}()
    for {
        select {
        case success, ok := <-successChannel:
            if !ok {
				break
			}
			if string(success) != "[]" {
				fmt.Println(fmt.Sprintf("%s Response: %s ", action, success))
				fmt.Println("")
			}
            return
        case failure, ok := <-errorChannel:
            if !ok {
				break
			}
            if string(failure) != "[]" {
				if displayError {
					fmt.Println(fmt.Sprintf("%s Error Callback: %s", action, failure))
					fmt.Println("")
				}
			}
            return
        case <-timeout:
            fmt.Println(fmt.Sprintf("%s Handler timeout after %d secs", action, timeoutVal))
			fmt.Println("")            
            return
        }
    }
}

Init

Initialize a new Pubnub instance.

        pubInstance := messaging.NewPubnub(<YOUR PUBLISH KEY>, <YOUR SUBSCRIBE KEY>, <SECRET KEY>, <CIPHER>, <SSL ON/OFF>, <UUID>)

Publish

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var callbackChannel = make(chan []byte)
        go pubInstance.Publish(<pubnub channel>, <message to publish>, callbackChannel, errorChannel)
        go handleResult(channel, errorChannel, messaging.GetNonSubscribeTimeout(), "Publish")
        // please goto the top of this file see the implementation of handleResult

Subscribe

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var subscribeChannel = make(chan []byte)
        go pubInstance.Subscribe(<pubnub channels, multiple channels can be separated by comma>, <timetoken, should be an empty string in this case>, subscribeChannel, <this field is FALSE for subscribe requests>, errorChannel)
        go handleSubscribeResult(subscribeChannel, errorChannel, "Subscribe")
        // please goto the top of this file see the implementation of handleSubscribeResult

Subscribe with timetoken

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var subscribeChannel = make(chan []byte)
        go pubInstance.Subscribe(<pubnub channel, multiple channels can be separated by comma>, <timetoken to init the request with>, subscribeChannel, <this field is FALSE for subscribe requests>, errorChannel)
        go handleSubscribeResult(subscribeChannel, errorChannel, "Subscribe")
        // please goto the top of this file see the implementation of handleSubscribeResult

Presence

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var presenceChannel = make(chan []byte)
        go pubInstance.Subscribe(<pubnub channel, multiple channels can be separated by comma>, <timetoken, should be an empty string in this case>, presenceChannel, <this field is TRUE for subscribe requests>, errorChannel)
        go handleSubscribeResult(presenceChannel, errorChannel, "Presence")  
        // please goto the top of this file see the implementation of handleSubscribeResult

Detailed History

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var channelCallback = make(chan []byte)
        go pubInstance.History(<pubnub channel>, <no of items to fetch>, <start time>, <end time>, false, channelCallback, errorChannel)
        //example: go _pub.History(<pubnub channel>, 100, 0, 0, false, channelCallback, errorChannel)
        go handleResult(channel, errorChannel, messaging.GetNonSubscribeTimeout(), "Detailed History") 
        // please goto the top of this file see the implementation of handleResult

Here_Now

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var channelCallback = make(chan []byte)
        go pubInstance.HereNow(<pubnub channel>, showUuid, includeUserState, channelCallback, errorChannel)
        go handleResult(channel, errorChannel, messaging.GetNonSubscribeTimeout(), "HereNow")
        // please goto the top of this file see the implementation of handleResult

Unsubscribe

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var channelCallback = make(chan []byte)
        go pubInstance.Unsubscribe(<pubnub channels, multiple channels can be separated by comma>, channelCallback, errorChannel)
        go handleResult(channel, errorChannel, messaging.GetNonSubscribeTimeout(), "Unsubscribe")
        // please goto the top of this file see the implementation of handleResult

Presence-Unsubscribe

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var channelCallback = make(chan []byte)
        go pubInstance.PresenceUnsubscribe(<pubnub channels, multiple channels can be separated by comma>, channelCallback, errorChannel)
        go handleResult(channel, errorChannel, messaging.GetNonSubscribeTimeout(), "UnsubscribePresence")
        // please goto the top of this file see the implementation of handleResult

Time

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var channelCallback = make(chan []byte)
        go pubInstance.GetTime(channelCallback, errorChannel)
        go handleResult(channel, errorChannel, messaging.GetNonSubscribeTimeout(), "Time")
        // please goto the top of this file see the implementation of handleResult

Disconnect/Retry

        //Init pubnub instance

        pubInstance.CloseExistingConnection() 

GrantSubscribe

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var pamChannel = make(chan []byte)
        go pub.GrantSubscribe(<pubnub channels>, true, true, 60, pamChannel, errorChannel)
        go handleResult(pamChannel, errorChannel, messaging.GetNonSubscribeTimeout(), "Susbcribe Grant")
        // please goto the top of this file see the implementation of handleResult

RevokeSubscribe

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var pamChannel = make(chan []byte)
        go pub.GrantSubscribe(<pubnub channels>, false, false, -1, pamChannel, errorChannel)
        go handleResult(pamChannel, errorChannel, messaging.GetNonSubscribeTimeout(), "Revoke Subscribe")
        // please goto the top of this file see the implementation of handleResult

AuditSubscribe

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var pamChannel = make(chan []byte)
        go pub.AuditSubscribe(<pubnub channels>, pamChannel, errorChannel)
        go handleResult(pamChannel, errorChannel, messaging.GetNonSubscribeTimeout(), "Audit Subscribe")
        // please goto the top of this file see the implementation of handleResult

GrantPresence

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var pamChannel = make(chan []byte)
        go pub.GrantPresence(<pubnub channels>, true, true, 60, pamChannel, errorChannel)
        go handleResult(pamChannel, errorChannel, messaging.GetNonSubscribeTimeout(), "Presence Grant")
        // please goto the top of this file see the implementation of handleResult

RevokePresence

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var pamChannel = make(chan []byte)
        go pub.GrantPresence(<pubnub channels>, false, false, -1, pamChannel, errorChannel)
        go handleResult(pamChannel, errorChannel, messaging.GetNonSubscribeTimeout(), "Revoke presence")
        // please goto the top of this file see the implementation of handleResult

AuditPresence

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var pamChannel = make(chan []byte)
        go pub.AuditPresence(<pubnub channels>, pamChannel, errorChannel)
        go handleResult(pamChannel, errorChannel, messaging.GetNonSubscribeTimeout(), "Audit Presence")
        // please goto the top of this file see the implementation of handleResult

SetAuthKey

        //Init pubnub instance

        pub.SetAuthenticationKey("authkey")

GetAuthKey

        //Init pubnub instance

        fmt.Println(pub.GetAuthenticationKey())

Set Presence Heartbeat

        //Init pubnub instance

        pub.SetPresenceHeartbeat(<presenceHeartbeat>)

Set Presence Heartbeat Interval

        //Init pubnub instance

        pub.SetPresenceHeartbeatInterval(<presenceHeartbeatInterval>)

Set User State using Key-Pair

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var successChannel = make(chan []byte)
        go pub.SetUserStateKeyVal(<pubnub channel>, <key>, <val>, successChannel, errorChannel)
        go handleResult(successChannel, errorChannel, messaging.GetNonSubscribeTimeout(), "Set User State")
        // please goto the top of this file see the implementation of handleResult

Delete User State

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var successChannel = make(chan []byte)
        go pub.SetUserStateKeyVal(<pubnub channel>, <key>, "", successChannel, errorChannel)
        go handleResult(successChannel, errorChannel, messaging.GetNonSubscribeTimeout(), "Del User State")
        // please goto the top of this file see the implementation of handleResult

Set User State using JSON

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var successChannel = make(chan []byte)
        go pub.SetUserStateJSON(<pubnub channel>, <jsonString>, successChannel, errorChannel)
        go handleResult(successChannel, errorChannel, messaging.GetNonSubscribeTimeout(), "Set User State JSON")
        // please goto the top of this file see the implementation of handleResult

Get User State

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var successChannel = make(chan []byte)
        go pub.GetUserState(<pubnub channel>, successChannel, errorChannel)
        go handleResult(successChannel, errorChannel, messaging.GetNonSubscribeTimeout(), "Get User State")
        // please goto the top of this file see the implementation of handleResult

Where Now

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var successChannel = make(chan []byte)
        go pub.WhereNow(<uuid>, successChannel, errorChannel)
        go handleResult(successChannel, errorChannel, messaging.GetNonSubscribeTimeout(), "WhereNow")

	// please goto the top of this file see the implementation of handleResult

Global Here Now

        //Init pubnub instance

        var errorChannel = make(chan []byte)
        var successChannel = make(chan []byte)
        go pub.GlobalHereNow(showUuid, includeUserState, successChannel, errorChannel)
        go handleResult(successChannel, errorChannel, messaging.GetNonSubscribeTimeout(), "Global here now")

	// please goto the top of this file see the implementation of handleResult

Change UUID

        //Init pubnub instance

        pub.SetUUID(<uuid>)

Exit

        //Init pubnub instance

        pubInstance.Abort()  

Contact support@pubnub.com for all questions