simplelog/simplelog.go

package simplelog

import (
	"context"
	"encoding/json"
	"log"
	"log/slog"
	"os"
	"time"

	"github.com/google/uuid"

	"github.com/mattn/go-isatty"
)

var (
	webhookURL = os.Getenv("LOGGER_WEBHOOK_URL")
)

var ourCustomLogger *slog.Logger
var ourCustomHandler slog.Handler

func init() {
	ourCustomHandler = NewMultiplexHandler()
	ourCustomLogger = slog.New(ourCustomHandler)
	slog.SetDefault(ourCustomLogger)
}

type MultiplexHandler struct {
	handlers []ExtendedHandler
}

func NewMultiplexHandler() slog.Handler {
	cl := &MultiplexHandler{}
	if isatty.IsTerminal(os.Stdout.Fd()) {
		cl.handlers = append(cl.handlers, NewConsoleHandler())
	} else {
		cl.handlers = append(cl.handlers, NewJSONHandler())
	}
	if webhookURL != "" {
		handler, err := NewWebhookHandler(webhookURL)
		if err != nil {
			log.Fatalf("Failed to initialize Webhook handler: %v", err)
		}
		cl.handlers = append(cl.handlers, handler)
	}
	return cl
}

func (cl *MultiplexHandler) Handle(
	ctx context.Context,
	record slog.Record,
) error {
	for _, handler := range cl.handlers {
		if err := handler.Handle(ctx, record); err != nil {
			return err
		}
	}
	return nil
}

func (cl *MultiplexHandler) Enabled(
	ctx context.Context,
	level slog.Level,
) bool {
	// send us all events
	return true
}

func (cl *MultiplexHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
	newHandlers := make([]ExtendedHandler, len(cl.handlers))
	for i, handler := range cl.handlers {
		newHandlers[i] = handler.WithAttrs(attrs)
	}
	return &MultiplexHandler{handlers: newHandlers}
}

func (cl *MultiplexHandler) WithGroup(name string) slog.Handler {
	newHandlers := make([]ExtendedHandler, len(cl.handlers))
	for i, handler := range cl.handlers {
		newHandlers[i] = handler.WithGroup(name)
	}
	return &MultiplexHandler{handlers: newHandlers}
}

type ExtendedEvent interface {
	GetID() uuid.UUID
	GetTimestamp() time.Time
	GetLevel() string
	GetMessage() string
	GetData() json.RawMessage
	GetFile() string
	GetLine() int
}

type extendedEvent struct {
	Event
	File string `json:"file"`
	Line int    `json:"line"`
}

func (e extendedEvent) GetID() uuid.UUID {
	return e.ID
}

func (e extendedEvent) GetTimestamp() time.Time {
	return e.Timestamp
}

func (e extendedEvent) GetLevel() string {
	return e.Level
}

func (e extendedEvent) GetMessage() string {
	return e.Message
}

func (e extendedEvent) GetData() json.RawMessage {
	return e.Data
}

func (e extendedEvent) GetFile() string {
	return e.File
}

func (e extendedEvent) GetLine() int {
	return e.Line
}

func NewExtendedEvent(baseEvent Event, file string, line int) ExtendedEvent {
	return extendedEvent{
		Event: baseEvent,
		File:  file,
		Line:  line,
	}
}