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slog: Loki handler

A Loki Handler for slog Go library.

^{Sponsored by:}

Cloud-native search engine for observability - An OSS alternative to Splunk, Elasticsearch, Loki, and Tempo.

See also:

slog-multi: slog.Handler chaining, fanout, routing, failover, load balancing...
slog-formatter: slog attribute formatting
slog-sampling: slog sampling policy

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

🚀 Install

go get github.com/samber/slog-loki/v3

Compatibility: go >= 1.21

No breaking changes will be made to exported APIs before v4.0.0.

💡 Usage

GoDoc: https://pkg.go.dev/github.com/samber/slog-loki/v3

Handler options

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

	// loki
	Client *loki.Client

	// optional: customize webhook event builder
	Converter Converter
	// 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
}

Attributes will be injected in log payload.

Other global parameters:

slogloki.SourceKey = "source"
slogloki.ErrorKeys = []string{"error", "err"}
slogloki.SubAttributeSeparator = "__"
slogloki.AttributeKeyInvalidCharReplacement = "_"

Example

import (
	"github.com/grafana/loki-client-go/loki"
	slogloki "github.com/samber/slog-loki/v3"
	"log/slog"
)

func main() {
	// setup loki client
	config, _ := loki.NewDefaultConfig("http://localhost:3100/loki/api/v1/push")
	config.TenantID = "xyz"
	client, _ := loki.New(config)

	logger := slog.New(slogloki.Option{Level: slog.LevelDebug, Client: client}.NewLokiHandler())
	logger = logger.
		With("environment", "dev").
		With("release", "v1.0.0")

	// log error
	logger.Error("caramba!")

	// log user signup
	logger.Info("user registration")

	// stop loki client and purge buffers
	client.Stop()
}

Tracing

Import the samber/slog-otel library.

import (
	slogloki "github.com/samber/slog-loki"
	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(
		slogloki.Option{
			// ...
			AttrFromContext: []func(ctx context.Context) []slog.Attr{
				slogotel.ExtractOtelAttrFromContext([]string{"tracing"}, "trace_id", "span_id"),
			},
		}.NewLokiHandler(),
	)

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

🤝 Contributing

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

	func flatten(prefix string, src map[string]any, dest model.LabelSet) {
	if len(prefix) > 0 {
	prefix += "."
	}
	for k, v := range src {
	switch child := v.(type) {
	case map[string]any:
	flatten(prefix+k, child, dest)
	case []any:
	for i := 0; i < len(child); i++ {
	dest[model.LabelName(prefix+k+"."+strconv.Itoa(i))] = model.LabelValue(fmt.Sprintf("%v", child[i]))
	}
	default:
	dest[model.LabelName(prefix+k)] = model.LabelValue(fmt.Sprintf("%v", v))
	}
	}
	}

samber / slog-loki Goto Github PK

slog-loki's Introduction

slog: Loki handler

🚀 Install

💡 Usage

Handler options

Example

Tracing

🤝 Contributing

👤 Contributors

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📝 License

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