slog: Graylog handler

A Graylog 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-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-datadog: A slog handler for Datadog
• slog-rollbar: A slog handler for Rollbar
• 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-loki: A slog handler for Loki
• 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-parquet: A slog handler for Parquet + Object Storage
• slog-zap: A slog handler for Zap
• slog-zerolog: A slog handler for Zerolog
• slog-logrus: A slog handler for Logrus

🚀 Install

go get github.com/samber/slog-graylog/v2

Compatibility: go >= 1.21

No breaking changes will be made to exported APIs before v3.0.0.

💡 Usage

GoDoc: https://pkg.go.dev/github.com/samber/slog-graylog/v2

Handler options

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

    // connection to graylog
    Writer *gelf.Writer

    // optional: customize json payload builder
    Converter Converter

    // 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:

sloggraylog.SourceKey = "source"
sloggraylog.ContextKey = "extra"
sloggraylog.ErrorKeys = []string{"error", "err"}

Example

import (
    "github.com/Graylog2/go-gelf/gelf"
    sloggraylog "github.com/samber/slog-graylog/v2"
    "log/slog"
)

func main() {
    // docker-compose up -d
    // or
    // ncat -l 12201 -u
    gelfWriter, err := gelf.NewWriter("localhost:12201")
    if err != nil {
        log.Fatalf("gelf.NewWriter: %s", err)
    }

    logger := slog.New(sloggraylog.Option{Level: slog.LevelDebug, Writer: gelfWriter}.NewGraylogHandler())
    logger = logger.
        With("environment", "dev").
        With("release", "v1.0.0")

    // log error
    logger.
        With("category", "sql").
        With("query.statement", "SELECT COUNT(*) FROM users;").
        With("query.duration", 1*time.Second).
        With("error", fmt.Errorf("could not count users")).
        Error("caramba!")

    // log user signup
    logger.
        With(
            slog.Group("user",
                slog.String("id", "user-123"),
                slog.Time("created_at", time.Now()),
            ),
        ).
        Info("user registration")
}

Output:

{
    "timestamp":"2023-04-10T14:00:0.000000+00:00",
    "level":"ERROR",
    "message":"caramba!",
    "error":{
        "error":"could not count users",
        "kind":"*errors.errorString",
        "stack":null
    },
    "extra":{
        "environment":"dev",
        "release":"v1.0.0",
        "category":"sql",
        "query.statement":"SELECT COUNT(*) FROM users;",
        "query.duration": "1s"
    }
}


{
    "timestamp":"2023-04-10T14:00:0.000000+00:00",
    "level":"INFO",
    "message":"user registration",
    "error":null,
    "extra":{
        "environment":"dev",
        "release":"v1.0.0",
        "user":{
            "id":"user-123",
            "created_at":"2023-04-10T14:00:0.000000+00:00"
        }
    }
}

🤝 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

👤 Contributors

💫 Show your support

Give a ⭐️ if this project helped you!

📝 License

Copyright © 2023 Samuel Berthe.

This project is MIT licensed.