GitHub - samber/slog-chi: 🚨 Chi middleware for slog logger (original) (raw)

slog: Chi middleware

Chi 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-mock: slog.Handler for test purposes

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 for slog logger

Loggers:

• slog-zap: A slog handler for Zap
• slog-zerolog: A slog handler for Zerolog
• slog-logrus: A slog handler for Logrus

Log sinks:

• slog-datadog: A slog handler for Datadog
• slog-betterstack: A slog handler for Betterstack
• slog-rollbar: A slog handler for Rollbar
• slog-loki: A slog handler for Loki
• 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-quickwit: A slog handler for Quickwit
• 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-channel: A slog handler for Go channels

🚀 Install

go get github.com/samber/slog-chi

Compatibility: go >= 1.21

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

💡 Usage

Handler options

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{}{ ... }

Minimal

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=""

OTEL

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)

Custom log levels

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)

Verbose

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)

Filters

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 / IgnoreStatusGreaterThan
• AcceptStatusLessThan / IgnoreStatusLessThan
• AcceptStatusGreaterThanOrEqual / IgnoreStatusGreaterThanOrEqual
• AcceptStatusLessThanOrEqual / 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/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=""

Using custom logger sub-group

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=""

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")

// 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=bar

JSON output

logger := 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":""}}

🤝 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.