slogecho

slog: Echo middleware

Echo middleware to log http requests using slog.

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-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

🚀 Install

go get github.com/samber/slog-echo

Compatibility: go >= 1.21

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

💡 Usage

Minimal

import (
	"net/http"
	"os"
	"time"

	"github.com/labstack/echo/v4"
	"github.com/labstack/echo/v4/middleware"
	slogecho "github.com/samber/slog-echo"
	"log/slog"
)

// Create a slog logger, which:
//   - Logs to stdout.
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))

// Echo instance
e := echo.New()

// Middleware
e.Use(slogecho.New(logger))
e.Use(middleware.Recover())

// Routes
e.GET("/", func(c echo.Context) error {
	return c.String(http.StatusOK, "Hello, World!")
})
e.GET("/error", func(c echo.Context) error {
	return echo.NewHTTPError(http.StatusInternalServerError, "I'm angry")
})

// Start server
e.Logger.Fatal(e.Start(":4242"))

// output:
// time=2023-04-10T14:00:00Z level=INFO msg="Success"  status=200 method=GET path=/ ip=::1 latency=25.958µs user-agent=curl/7.77.0 time=2023-04-10T14:00:00Z request-id=229c7fc8-64f5-4467-bc4a-940700503b0d

Using custom time formatters

import (
	"github.com/labstack/echo/v4"
	"github.com/labstack/echo/v4/middleware"
	slogecho "github.com/samber/slog-echo"
	slogformatter "github.com/samber/slog-formatter"
	"log/slog"
)

// Create a slog logger, which:
//   - Logs to stdout.
//   - RFC3339 with UTC time format.
logger := slog.New(
	slogformatter.NewFormatterHandler(
		slogformatter.TimezoneConverter(time.UTC),
		slogformatter.TimeFormatter(time.DateTime, nil),
	)(
		slog.NewTextHandler(os.Stdout, nil),
	),
)

// Echo instance
e := echo.New()

// Middleware
e.Use(slogecho.New(logger))
e.Use(middleware.Recover())

// Routes
e.GET("/", func(c echo.Context) error {
	return c.String(http.StatusOK, "Hello, World!")
})
e.GET("/error", func(c echo.Context) error {
	return echo.NewHTTPError(http.StatusInternalServerError, "I'm angry")
})

// Start server
e.Logger.Fatal(e.Start(":4242"))

// output:
// time=2023-04-10T14:00:00Z level=INFO msg="Success"  status=200 method=GET path=/ ip=::1 latency=25.958µs user-agent=curl/7.77.0 time=2023-04-10T14:00:00Z request-id=229c7fc8-64f5-4467-bc4a-940700503b0d

Using custom logger sub-group

import (
	"github.com/labstack/echo/v4"
	"github.com/labstack/echo/v4/middleware"
	slogecho "github.com/samber/slog-echo"
	"log/slog"
)

// Create a slog logger, which:
//   - Logs to stdout.
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))

// Echo instance
e := echo.New()

// Middleware
e.Use(slogecho.New(logger.WithGroup("http")))
e.Use(middleware.Recover())

// Routes
e.GET("/", func(c echo.Context) error {
	return c.String(http.StatusOK, "Hello, World!")
})
e.GET("/error", func(c echo.Context) error {
	return echo.NewHTTPError(http.StatusInternalServerError, "I'm angry")
})

// Start server
e.Logger.Fatal(e.Start(":4242"))

// output:
// time=2023-04-10T14:00:00Z level=INFO msg="Success"  http.status=200 http.method=GET http.path=/ http.ip=::1 http.latency=25.958µs http.user-agent=curl/7.77.0 http.time=2023-04-10T14:00:00Z http.request-id=229c7fc8-64f5-4467-bc4a-940700503b0d

Add logger to a single route

import (
	"github.com/labstack/echo/v4"
	"github.com/labstack/echo/v4/middleware"
	slogecho "github.com/samber/slog-echo"
	"log/slog"
)

// Create a slog logger, which:
//   - Logs to stdout.
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))

// Echo instance
e := echo.New()

// Middleware
e.Use(middleware.Recover())

// Routes
e.GET("/", func(c echo.Context) error {
	return c.String(http.StatusOK, "Hello, World!")
}, slogecho.New(logger))

// Start server
e.Logger.Fatal(e.Start(":4242"))

// output:
// time=2023-04-10T14:00:00Z level=INFO msg="Success"  status=200 method=GET path=/ ip=::1 latency=25.958µs user-agent=curl/7.77.0 time=2023-04-10T14:00:00Z request-id=229c7fc8-64f5-4467-bc4a-940700503b0d

Adding custom attributes

import (
	"github.com/labstack/echo/v4"
	"github.com/labstack/echo/v4/middleware"
	slogecho "github.com/samber/slog-echo"
	"log/slog"
)

// Create a slog logger, which:
//   - Logs to stdout.
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))

// Add an attribute to all log entries made through this logger.
logger = logger.With("env", "production")

// Echo instance
e := echo.New()

// Middleware
e.Use(slogecho.New(logger))
e.Use(middleware.Recover())

// Routes
e.GET("/", func(c echo.Context) error {
	return c.String(http.StatusOK, "Hello, World!")
})

// Start server
e.Logger.Fatal(e.Start(":4242"))

// output:
// time=2023-04-10T14:00:00Z level=INFO msg="Success" env=production status=200 method=GET path=/ ip=::1 latency=25.958µs user-agent=curl/7.77.0 time=2023-04-10T14:00:00Z request-id=229c7fc8-64f5-4467-bc4a-940700503b0d

JSON output

import (
	"github.com/labstack/echo/v4"
	"github.com/labstack/echo/v4/middleware"
	slogecho "github.com/samber/slog-echo"
	"log/slog"
)

// Create a slog logger, which:
//   - Logs to stdout.
logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))

// Echo instance
e := echo.New()

// Middleware
e.Use(slogecho.New(logger))
e.Use(middleware.Recover())

// Routes
e.GET("/", func(c echo.Context) error {
	return c.String(http.StatusOK, "Hello, World!")
})

// Start server
e.Logger.Fatal(e.Start(":4242"))

// output:
// {"time":"2023-04-10T14:00:00Z","level":"INFO","msg":"Success","env":"production","status":200,"method":"GET","path":"/","ip":"::1","latency":"25.958µs","user-agent":"curl/7.77.0","time":"2023-04-10T14:00:00Z","request-id":"04201917-d7ba-4b20-a3bb-2fffba5f2bd9"}

🤝 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.