Logging for Go SDK

This page explains how to enable logging in the PubNub Go Software Development Kit (SDK) using a custom log.Logger.

To enable logging, you need to init by specifying the logger instance in messaging.NewPubnub.

Required UUID

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. If you don't set the UUID, you won't be able to connect to PubNub.

1package main
2

3import (
4	"fmt"
5	"log"
6	"os"
7

8	pubnub "github.com/pubnub/go/v7"
9)
10

11func main() {
12	// Create a new PubNub configuration
13	config := pubnub.NewConfigWithUserId("loggingDemoUser")
14	
15	// Set the subscribe and publish keys
16	// Replace "demo" with your actual keys from the PubNub Admin Portal
17	config.SubscribeKey = "demo"
18	config.PublishKey = "demo"
19	
20	// Set up logging
21	var infoLogger *log.Logger
22	
23	// Specify log file name
24	logfileName := "pubnubMessaging.log"
25	
26	// Open log file, creating it if needed with append mode
27	f, err := os.OpenFile(logfileName, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
28	if err != nil {
29		fmt.Println("Error opening log file:", err.Error())
30		fmt.Println("Logging disabled")
31	} else {
32		fmt.Println("Logging enabled, writing to", logfileName)
33		
34		// Create a new logger with timestamp and file information
35		infoLogger = log.New(f, "", log.Ldate|log.Ltime|log.Lshortfile)
36		
37		// Set the logger in the PubNub config
38		config.Log = infoLogger
39		config.Log.SetPrefix("PubNub :=  ")
40	}
41	
42	// Initialize PubNub with the configured settings
43	pn := pubnub.NewPubNub(config)
44	
45	// Perform an operation to generate log entries
46	_, _, err = pn.Time().Execute()
47	if err != nil {
48		fmt.Println("Error fetching time:", err)
49	} else {
50		fmt.Println("Time fetched successfully, check the log file for details")
51	}
52	
53	// Publish a message to demonstrate logging
54	_, status, err := pn.Publish().
55		Channel("logging-demo-channel").
56		Message("Hello from Logging Example").
57		Execute()
58	
59	if err != nil {
60		fmt.Printf("Error publishing message: %v\n", err)
61	} else {
62		fmt.Printf("Publish status: %v\n", status.StatusCode)
63		fmt.Println("Check the log file for detailed logging information")
64	}
65	
66	fmt.Println("Example complete. Logging information has been saved to", logfileName)
67}

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