Chi middleware to log http requests using slog.
Sponsored by:
Cloud-native search engine for observability - An OSS alternative to Splunk, Elasticsearch, Loki, and Tempo.
See also:
- slog-multi:
slog.Handlerchaining, fanout, routing, failover, load balancing... - slog-formatter:
slogattribute formatting - slog-sampling:
slogsampling policy - slog-mock:
slog.Handlerfor test purposes
HTTP middlewares:
- slog-gin: Gin middleware for
sloglogger - slog-echo: Echo middleware for
sloglogger - slog-fiber: Fiber middleware for
sloglogger - slog-chi: Chi middleware for
sloglogger - slog-http:
net/httpmiddleware forsloglogger
Loggers:
- slog-zap: A
sloghandler forZap - slog-zerolog: A
sloghandler forZerolog - slog-logrus: A
sloghandler forLogrus
Log sinks:
- slog-datadog: A
sloghandler forDatadog - slog-betterstack: A
sloghandler forBetterstack - slog-rollbar: A
sloghandler forRollbar - slog-loki: A
sloghandler forLoki - slog-sentry: A
sloghandler forSentry - slog-syslog: A
sloghandler forSyslog - slog-logstash: A
sloghandler forLogstash - slog-fluentd: A
sloghandler forFluentd - slog-graylog: A
sloghandler forGraylog - slog-quickwit: A
sloghandler forQuickwit - slog-slack: A
sloghandler forSlack - slog-telegram: A
sloghandler forTelegram - slog-mattermost: A
sloghandler forMattermost - slog-microsoft-teams: A
sloghandler forMicrosoft Teams - slog-webhook: A
sloghandler forWebhook - slog-kafka: A
sloghandler forKafka - slog-nats: A
sloghandler forNATS - slog-parquet: A
sloghandler forParquet+Object Storage - slog-channel: A
sloghandler for Go channels
go get github.com/samber/slog-chiCompatibility: 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:
slogchi.TraceIDKey = "trace_id"
slogchi.SpanIDKey = "span_id"
slogchi.RequestIDKey = "id"
slogchi.RequestBodyMaxSize = 64 * 1024 // 64KB
slogchi.ResponseBodyMaxSize = 64 * 1024 // 64KB
slogchi.HiddenRequestHeaders = map[string]struct{}{ ... }
slogchi.HiddenResponseHeaders = map[string]struct{}{ ... }import (
"net/http"
"os"
"time"
"github.com/go-chi/chi/v5"
"github.com/go-chi/chi/v5/middleware"
slogchi "github.com/samber/slog-chi"
"log/slog"
)
// Create a slog logger, which:
// - Logs to stdout.
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
// Chi instance
router := chi.NewRouter()
// Middleware
router.Use(slogchi.New(logger))
router.Use(middleware.Recoverer)
// Routes
router.GET("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte("Hello, World!"))
})
router.GET("/error", func(w http.ResponseWriter, r *http.Request) {
http.Error(w, http.StatusText(400), 400)
})
// Start server
err := http.ListenAndServe(":4242", router)
// output:
// time=2023-10-15T20:32:58.926+02:00 level=INFO msg="200: OK" 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=""logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
config := slogchi.Config{
WithSpanID: true,
WithTraceID: true,
}
router := chi.NewRouter()
router.Use(slogchi.NewWithConfig(logger, config))
router.Use(middleware.Recoverer)logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
config := slogchi.Config{
DefaultLevel: slog.LevelInfo,
ClientErrorLevel: slog.LevelWarn,
ServerErrorLevel: slog.LevelError,
}
router := chi.NewRouter()
router.Use(slogchi.NewWithConfig(logger, config))
router.Use(middleware.Recoverer)logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
config := slogchi.Config{
WithRequestBody: true,
WithResponseBody: true,
WithRequestHeader: true,
WithResponseHeader: true,
}
router := chi.NewRouter()
router.Use(slogchi.NewWithConfig(logger, config))
router.Use(middleware.Recoverer)logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
router := chi.NewRouter()
router.Use(
slogchi.NewWithFilters(
logger,
slogchi.Accept(func (ww middleware.WrapResponseWriter, r *http.Request) bool {
return xxx
}),
slogchi.IgnoreStatus(401, 404),
),
)
router.Use(middleware.Recoverer)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
import (
"github.com/go-chi/chi/v5"
"github.com/go-chi/chi/v5/middleware"
slogchi "github.com/samber/slog-chi"
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),
),
)
// Chi instance
router := chi.NewRouter()
// Middleware
router.Use(slogchi.New(logger))
router.Use(middleware.Recoverer)
// Routes
router.GET("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte("Hello, World!"))
})
router.GET("/error", func(w http.ResponseWriter, r *http.Request) {
http.Error(w, http.StatusText(400), 400)
})
// Start server
err := http.ListenAndServe(":4242", router)
// output:
// time=2023-10-15T20:32:58.926+02:00 level=INFO msg="200: OK" env=production request.time=2023-10-15T20:32:58.626Z 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=""logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
// Chi instance
router := chi.NewRouter()
// Middleware
router.Use(slogchi.New(logger.WithGroup("http")))
router.Use(middleware.Recoverer)
// Routes
router.GET("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte("Hello, World!"))
})
router.GET("/error", func(w http.ResponseWriter, r *http.Request) {
http.Error(w, http.StatusText(400), 400)
})
// Start server
err := http.ListenAndServe(":4242", router)
// output:
// time=2023-10-15T20:32:58.926+02:00 level=INFO msg="200: OK" 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=""logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
// Add an attribute to all log entries made through this logger.
logger = logger.With("env", "production")
// Chi instance
router := chi.NewRouter()
// Middleware
router.Use(slogchi.New(logger))
router.Use(middleware.Recoverer)
// Routes
router.GET("/", func(w http.ResponseWriter, r *http.Request) {
// Add an attribute to a single log entry.
slogchi.AddCustomAttributes(r, slog.String("foo", "bar"))
w.Write([]byte("Hello, World!"))
})
// Start server
err := http.ListenAndServe(":4242", router)
// output:
// time=2023-10-15T20:32:58.926+02:00 level=INFO msg="200: OK" 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="" foo=barlogger := slog.New(slog.NewJSONHandler(os.Stdout, nil))
// Chi instance
router := chi.NewRouter()
// Middleware
router.Use(slogchi.New(logger))
router.Use(middleware.Recoverer)
// Routes
router.GET("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte("Hello, World!"))
})
// Start server
err := http.ListenAndServe(":4242", router)
// output:
// {"time":"2023-10-15T20:32:58.926+02:00","level":"INFO","msg":"200: OK","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":""}}- 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-testGive a βοΈ if this project helped you!
Copyright Β© 2023 Samuel Berthe.
This project is MIT licensed.