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Overview

Gogram provides a flexible logging system. By default, it uses a built-in logger that prints to stdout with different log levels. You can configure the default logger or replace it entirely with your own implementation.

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Default Logger

You can configure the default logger when initializing the client. 
client, _ := telegram.NewClient(telegram.ClientConfig{
    LogLevel: telegram.LogDebug, // Set log level
    Logger:   telegram.NewDefaultLogger("my-bot"), // Custom prefix
})

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Custom Logger

You can integrate Gogram with your existing logging infrastructure (e.g., Zap, Logrus) by implementing the telegram.Logger interface.

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Simple Wrapper

For most use cases, you can use WrapSimpleLogger which requires implementing only a few basic methods. 
// Assume you have a Zap logger
type ZapAdapter struct {
    *zap.SugaredLogger
}

// Implement the SimpleLogger interface methods
func (z *ZapAdapter) Debug(msg any, args ...any) { z.Debugf(fmt.Sprint(msg), args...) }
func (z *ZapAdapter) Info(msg any, args ...any)  { z.Infof(fmt.Sprint(msg), args...) }
func (z *ZapAdapter) Warn(msg any, args ...any)  { z.Warnf(fmt.Sprint(msg), args...) }
func (z *ZapAdapter) Error(msg any, args ...any) { z.Errorf(fmt.Sprint(msg), args...) }
// ... implement GetLevel/SetLevel etc.

// Usage
client, _ := telegram.NewClient(telegram.ClientConfig{
    Logger: telegram.WrapSimpleLogger(&ZapAdapter{logger}),
})

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Advanced Logger Implementation

If you need full control (formatting, structured logging, fields), implement the full telegram.Logger interface directly. 
type Logger interface {
    SetLevel(telegram.LogLevel) Logger
    WithField(key string, value any) Logger
    Debug(msg any, args ...any)
    Info(msg any, args ...any)
    Warn(msg any, args ...any)
    Error(msg any, args ...any)
    Lev() LogLevel
    SetColor(bool)
    Color() bool
    SetPrefix(string)
    CloneInternal() Logger
    // ... possibly others, check source
}