What are some examples of using Zerolog for logging in Go?

Can you show me some examples of how to use Zerolog for logging in Go?

Sure! Zerolog is a fast and simple logging library for Go. Here's a basic example:

package main

import (
    "github.com/rs/zerolog"
    "github.com/rs/zerolog/log"
    "os"
)

func main() {
    // Set the log level to debug
    zerolog.SetGlobalLevel(zerolog.DebugLevel)

    // Create a logger that writes to stdout
    log.Logger = log.Output(zerolog.ConsoleWriter{Out: os.Stdout})

    // Log a simple message
    log.Info().Msg("Hello, Zerolog!")
}

This will log a message to the console. Would you like to see more advanced examples?

Yes, can you show me how to log structured data?

Absolutely! Here's how you can log structured data with Zerolog:

log.Info().Str("user", "john_doe").Int("age", 30).Msg("User logged in")

This will log a message with the user and age as structured fields. Would you like to know about logging errors?

Yes, how do I log errors using Zerolog?

You can log errors like this:

err := someFunction()
if err != nil {
    log.Error().Err(err).Msg("An error occurred")
}

This will log the error along with a message. Do you need help with anything else?

What about logging to a file?

To log to a file, you can set up a file writer like this:

file, err := os.OpenFile("log.txt", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
if err != nil {
    log.Fatal().Err(err).Msg("Failed to open log file")
}
log.Logger = log.Output(file)

This will direct all logs to log.txt. Let me know if you have more questions!