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-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-nats: A slog handler for NATS
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

# echo v4 (current)
go get github.com/samber/slog-echo

# echo v5 (alpha)
go get github.com/samber/slog-echo@echo-v5

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=/ route=/ ip=::1 latency=25.958µs user-agent=curl/7.77.0 time=2023-04-10T14:00:00Z request-id=229c7fc8-64f5-4467-bc4a-940700503b0d

OTEL

logger := slog.New(slog.NewTextHandler(os.Stdout, nil))

config := slogecho.Config{
	WithSpanID:  true,
	WithTraceID: true,
}

e := echo.New()
e.Use(slogecho.NewWithConfig(logger, config))
e.Use(middleware.Recover())

Verbose

logger := slog.New(slog.NewTextHandler(os.Stdout, nil))

config := slogecho.Config{
	WithRequestBody: true,
	WithResponseBody: true,
	WithRequestHeader: true,
	WithResponseHeader: true,
}

e := echo.New()
e.Use(slogecho.NewWithConfig(logger, config))
e.Use(middleware.Recover())

Filters

logger := slog.New(slog.NewTextHandler(os.Stdout, nil))

e := echo.New()
e.Use(
	slogecho.NewWithFilters(
		logger,
		slogecho.Accept(func (c echo.Context) bool {
			return xxx
		}),
		slogecho.IgnoreStatus(401, 404),
	),
)
e.Use(middleware.Recover())

Available filters:

Accept / Ignore
AcceptMethod / IgnoreMethod
AcceptStatus / IgnoreStatus
AcceptStatusGreaterThan / IgnoreStatusLessThan
AcceptStatusGreaterThanOrEqual / IgnoreStatusLessThanOrEqual
AcceptPath / IgnorePath
AcceptPathContains / IgnorePathContains
AcceptPathPrefix / IgnorePathPrefix
AcceptPathSuffix / IgnorePathSuffix
AcceptPathMatch / IgnorePathMatch
AcceptHost / IgnoreHost
AcceptHostContains / IgnoreHostContains
AcceptHostPrefix / IgnoreHostPrefix
AcceptHostSuffix / IgnoreHostSuffix
AcceptHostMatch / IgnoreHostMatch

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=/ route=/ 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

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.route=/ 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

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=/ route=/ 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

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 {
	// Add an attribute to a single log entry.
	slogecho.AddCustomAttributes(c, slog.String("foo", "bar"))
	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=/ route=/ ip=::1 latency=25.958µs user-agent=curl/7.77.0 time=2023-04-10T14:00:00Z request-id=229c7fc8-64f5-4467-bc4a-940700503b0d foo=bar

JSON output

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

Contributors

💫 Show your support

Give a ⭐️ if this project helped you!

📝 License

This project is MIT licensed.

# README