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samber/slog-betterstack: 🚨 slog: Betterstack handler

A Betterstack Handler for slog Go library.

See also:

• slog-multi: slog.Handler chaining, fanout, routing, failover, load balancing...
• slog-formatter: slog attribute formatting
• slog-sampling: slog sampling policy
• slog-mock: slog.Handler for test purposes

HTTP middlewares:

• slog-gin: Gin middleware for slog logger
• slog-echo: Echo middleware for slog logger
• slog-fiber: Fiber middleware for slog logger
• slog-chi: Chi middleware for slog logger
• slog-http: net/http middleware for slog logger

Loggers:

• slog-zap: A slog handler for Zap
• slog-zerolog: A slog handler for Zerolog
• slog-logrus: A slog handler for Logrus

Log sinks:

• slog-datadog: A slog handler for Datadog
• slog-betterstack: A slog handler for Betterstack
• slog-rollbar: A slog handler for Rollbar
• slog-loki: A slog handler for Loki
• slog-sentry: A slog handler for Sentry
• slog-syslog: A slog handler for Syslog
• slog-logstash: A slog handler for Logstash
• slog-fluentd: A slog handler for Fluentd
• slog-graylog: A slog handler for Graylog
• slog-quickwit: A slog handler for Quickwit
• slog-slack: A slog handler for Slack
• slog-telegram: A slog handler for Telegram
• slog-mattermost: A slog handler for Mattermost
• slog-microsoft-teams: A slog handler for Microsoft Teams
• slog-webhook: A slog handler for Webhook
• slog-kafka: A slog handler for Kafka
• slog-nats: A slog handler for NATS
• slog-parquet: A slog handler for Parquet + Object Storage
• slog-channel: A slog handler for Go channels

go get github.com/samber/slog-betterstack

Compatibility: go >= 1.21

No breaking changes will be made to exported APIs before v2.0.0.

GoDoc: https://pkg.go.dev/github.com/samber/slog-betterstack

type Option struct {
  // log level (default: debug)
  Level     slog.Leveler

  // token
  Token   string
  // optional: endpoint
  Endpoint string
  // default: 10s
  Timeout time.Duration

  // optional: customize record builder
  Converter Converter
  // optional: custom marshaler
  Marshaler func(v any) ([]byte, error)
  // optional: fetch attributes from context
  AttrFromContext []func(ctx context.Context) []slog.Attr

  // optional: see slog.HandlerOptions
  AddSource   bool
  ReplaceAttr func(groups []string, a slog.Attr) slog.Attr
}

Other global parameters:

slogbetterstack.SourceKey = "runtime"
slogbetterstack.ContextKey = "context"
slogbetterstack.ErrorKeys = []string{"error", "err"}

import (
	"fmt"
	"net/http"
	"time"

	slogbetterstack "github.com/samber/slog-betterstack"

	"log/slog"
)

func main() {
	logger := slog.New(slogbetterstack.Option{Level: slog.LevelDebug, Token: "xxxxx"}.NewBetterstackHandler())
	logger = logger.With("release", "v1.0.0")

	logger.
		With(
			slog.Group("user",
				slog.String("id", "user-123"),
				slog.Time("created_at", time.Now()),
			),
		).
		With("error", fmt.Errorf("an error")).
		Error("a message", slog.Int("count", 1))
}

Import the samber/slog-otel library.

import (
	slogbetterstack "github.com/samber/slog-betterstack"
	slogotel "github.com/samber/slog-otel"
	"go.opentelemetry.io/otel/sdk/trace"
)

func main() {
	tp := trace.NewTracerProvider(
		trace.WithSampler(trace.AlwaysSample()),
	)
	tracer := tp.Tracer("hello/world")

	ctx, span := tracer.Start(context.Background(), "foo")
	defer span.End()

	span.AddEvent("bar")

	logger := slog.New(
		slogbetterstack.Option{
			// ...
			AttrFromContext: []func(ctx context.Context) []slog.Attr{
				slogotel.ExtractOtelAttrFromContext([]string{"tracing"}, "trace_id", "span_id"),
			},
		}.NewBetterstackHandler(),
	)

	logger.ErrorContext(ctx, "a message")
}

• Ping me on Twitter @samuelberthe (DMs, mentions, whatever :))
• Fork the project
• Fix open issues or request new features

Don't hesitate ;)

# Install some dev dependencies
make tools

# Run tests
make test
# or
make watch-test

Give a ⭐️ if this project helped you!

Copyright © 2023 Samuel Berthe.

This project is MIT licensed.

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