Fiber middleware to log http requests using slog.
Sponsored by:
![Quickwit](https://private-user-images.githubusercontent.com/2951285/344655969-49aaaa2b-b8c6-4f21-909f-c12577bb6a2e.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.0V6RlE26W5AJFngHZPqaYw3YQFFMsm5t7tghy0OPmVE)
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 forslog
logger
Loggers:
- slog-zap: A
slog
handler forZap
- slog-zerolog: A
slog
handler forZerolog
- slog-logrus: A
slog
handler forLogrus
Log sinks:
- slog-datadog: A
slog
handler forDatadog
- slog-betterstack: A
slog
handler forBetterstack
- slog-rollbar: A
slog
handler forRollbar
- slog-loki: A
slog
handler forLoki
- slog-sentry: A
slog
handler forSentry
- slog-syslog: A
slog
handler forSyslog
- slog-logstash: A
slog
handler forLogstash
- slog-fluentd: A
slog
handler forFluentd
- slog-graylog: A
slog
handler forGraylog
- slog-quickwit: A
slog
handler forQuickwit
- slog-slack: A
slog
handler forSlack
- slog-telegram: A
slog
handler forTelegram
- slog-mattermost: A
slog
handler forMattermost
- slog-microsoft-teams: A
slog
handler forMicrosoft Teams
- slog-webhook: A
slog
handler forWebhook
- slog-kafka: A
slog
handler forKafka
- slog-nats: A
slog
handler forNATS
- slog-parquet: A
slog
handler forParquet
+Object Storage
- slog-channel: A
slog
handler for Go channels
# Fiber v2 (current)
go get github.com/samber/slog-fiber
# Fiber v3 (beta)
go get github.com/samber/slog-fiber@fiber-v3
Compatibility: go >= 1.21
No breaking changes will be made to exported APIs before v2.0.0.
type Config struct {
DefaultLevel slog.Level
ClientErrorLevel slog.Level
ServerErrorLevel slog.Level
WithUserAgent bool
WithRequestID bool
WithRequestBody bool
WithRequestHeader bool
WithResponseBody bool
WithResponseHeader bool
WithSpanID bool
WithTraceID bool
Filters []Filter
}
Attributes will be injected in log payload.
Other global parameters:
slogfiber.TraceIDKey = "trace_id"
slogfiber.SpanIDKey = "span_id"
slogfiber.RequestBodyMaxSize = 64 * 1024 // 64KB
slogfiber.ResponseBodyMaxSize = 64 * 1024 // 64KB
slogfiber.HiddenRequestHeaders = map[string]struct{}{ ... }
slogfiber.HiddenResponseHeaders = map[string]struct{}{ ... }
slogfiber.RequestIDHeaderKey = "X-Request-Id"
import (
"github.com/gofiber/fiber/v2"
"github.com/gofiber/fiber/v2/middleware/recover"
slogfiber "github.com/samber/slog-fiber"
"log/slog"
)
// Create a slog logger, which:
// - Logs to stdout.
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
app := fiber.New()
app.Use(slogfiber.New(logger))
app.Use(recover.New())
app.Get("/", func(c *fiber.Ctx) error {
return c.SendString("Hello, World ๐!")
})
app.Listen(":4242")
// output:
// time=2023-10-15T20:32:58.926+02:00 level=INFO msg="Incoming request" env=production request.time=2023-10-15T20:32:58.626+02:00 request.method=GET request.path=/ request.route="" request.ip=127.0.0.1:63932 request.length=0 response.time=2023-10-15T20:32:58.926+02:00 response.latency=100ms response.status=200 response.length=7 id=229c7fc8-64f5-4467-bc4a-940700503b0d
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
config := slogfiber.Config{
WithSpanID: true,
WithTraceID: true,
}
app := fiber.New()
app.Use(slogfiber.NewWithConfig(logger, config))
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
config := slogfiber.Config{
DefaultLevel: slog.LevelInfo,
ClientErrorLevel: slog.LevelWarn,
ServerErrorLevel: slog.LevelError,
}
app := fiber.New()
app.Use(slogfiber.NewWithConfig(logger, config))
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
config := slogfiber.Config{
WithRequestBody: true,
WithResponseBody: true,
WithRequestHeader: true,
WithResponseHeader: true,
}
app := fiber.New()
app.Use(slogfiber.NewWithConfig(logger, config))
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
app := fiber.New()
app.Use(
slogfiber.NewWithFilters(
logger,
slogfiber.Accept(func (c *fiber.Ctx) bool {
return xxx
}),
slogfiber.IgnoreStatus(401, 404),
),
)
app.Use(recover.New())
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
// 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.RFC3339, nil),
)(
slog.NewTextHandler(os.Stdout, nil),
),
)
app := fiber.New()
app.Use(slogfiber.New(logger))
app.Use(recover.New())
app.Get("/", func(c *fiber.Ctx) error {
return c.SendString("Hello, World ๐!")
})
app.Listen(":4242")
// output:
// time=2023-10-15T20:32:58.926+02:00 level=INFO msg="Incoming request" env=production request.time=2023-10-15T20:32:58Z request.method=GET request.path=/ request.route="" request.ip=127.0.0.1:63932 request.length=0 response.time=2023-10-15T20:32:58Z response.latency=100ms response.status=200 response.length=7 id=229c7fc8-64f5-4467-bc4a-940700503b0d
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
app := fiber.New()
app.Use(slogfiber.New(logger.WithGroup("http")))
app.Use(recover.New())
app.Get("/", func(c *fiber.Ctx) error {
return c.SendString("Hello, World ๐!")
})
app.Listen(":4242")
// output:
// time=2023-10-15T20:32:58.926+02:00 level=INFO msg="Incoming request" env=production http.request.time=2023-10-15T20:32:58.626+02:00 http.request.method=GET http.request.path=/ http.request.route="" http.request.ip=127.0.0.1:63932 http.request.length=0 http.response.time=2023-10-15T20:32:58.926+02:00 http.response.latency=100ms http.response.status=200 http.response.length=7 http.id=229c7fc8-64f5-4467-bc4a-940700503b0d
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
app := fiber.New()
app.Use(recover.New())
app.Get("/", slogfiber.New(logger), func(c *fiber.Ctx) error {
return c.SendString("Hello, World ๐!")
})
app.Listen(":4242")
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
// Add an attribute to all log entries made through this logger.
logger = logger.With("env", "production")
app := fiber.New()
app.Use(slogfiber.New(logger))
app.Use(recover.New())
app.Get("/", func(c *fiber.Ctx) error {
// Add an attribute to a single log entry.
slogfiber.AddCustomAttributes(c, slog.String("foo", "bar"))
return c.SendString("Hello, World ๐!")
})
app.Listen(":4242")
// output:
// time=2023-10-15T20:32:58.926+02:00 level=INFO msg="Incoming request" env=production request.time=2023-10-15T20:32:58.626+02:00 request.method=GET request.path=/ request.route="" request.ip=127.0.0.1:63932 request.length=0 response.time=2023-10-15T20:32:58.926+02:00 response.latency=100ms response.status=200 response.length=7 id=229c7fc8-64f5-4467-bc4a-940700503b0d foo=bar
logger := slog.New(slog.NewJSONHandler(os.Stdout, nil)),
app := fiber.New()
app.Use(slogfiber.New(logger))
app.Use(recover.New())
app.Get("/", func(c *fiber.Ctx) error {
return c.SendString("Hello, World ๐!")
})
app.Listen(":4242")
// output:
// {"time":"2023-10-15T20:32:58.926+02:00","level":"INFO","msg":"Incoming request","env":"production","http":{"request":{"time":"2023-10-15T20:32:58.626+02:00","method":"GET","path":"/","route":"","ip":"127.0.0.1:55296","length":0},"response":{"time":"2023-10-15T20:32:58.926+02:00","latency":100000,"status":200,"length":7},"id":"04201917-d7ba-4b20-a3bb-2fffba5f2bd9"}}
- 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 โญ๏ธ if this project helped you!
Copyright ยฉ 2023 Samuel Berthe.
This project is MIT licensed.