Replace zerolog with log/slog from stdlib

- Rewrite logger package to use slog with LevelVar for dynamic levels
- Update all packages to use *slog.Logger instead of *zerolog.Logger
- Use TextHandler for TTY (dev), JSONHandler for production
- Add make check target (runs lint + test)
- Add make test target

internal/middleware/middleware.go

@@ -1,6 +1,7 @@
 package middleware
 
 import (
+	"log/slog"
 	"net"
 	"net/http"
 	"time"
@@ -11,7 +12,6 @@ import (
 	basicauth "github.com/99designs/basicauth-go"
 	"github.com/go-chi/chi/middleware"
 	"github.com/go-chi/cors"
-	"github.com/rs/zerolog"
 	metrics "github.com/slok/go-http-metrics/metrics/prometheus"
 	ghmm "github.com/slok/go-http-metrics/middleware"
 	"github.com/slok/go-http-metrics/middleware/std"
@@ -27,7 +27,7 @@ type MiddlewareParams struct {
 }
 
 type Middleware struct {
-	log    *zerolog.Logger
+	log    *slog.Logger
 	params *MiddlewareParams
 }
 
@@ -38,9 +38,6 @@ func New(lc fx.Lifecycle, params MiddlewareParams) (*Middleware, error) {
 	return s, nil
 }
 
-// the following is from
-// https://learning-cloud-native-go.github.io/docs/a6.adding_zerolog_logger/
-
 func ipFromHostPort(hp string) string {
 	h, _, err := net.SplitHostPort(hp)
 	if err != nil {
@@ -70,7 +67,6 @@ func (lrw *loggingResponseWriter) WriteHeader(code int) {
 // this returns a Middleware that is designed to do every request through the
 // mux, note the signature:
 func (s *Middleware) Logging() func(http.Handler) http.Handler {
-	// FIXME this should use https://github.com/google/go-cloud/blob/master/server/requestlog/requestlog.go
 	return func(next http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 			start := time.Now()
@@ -78,18 +74,18 @@ func (s *Middleware) Logging() func(http.Handler) http.Handler {
 			ctx := r.Context()
 			defer func() {
 				latency := time.Since(start)
-				s.log.Info().
-					Time("request_start", start).
-					Str("method", r.Method).
-					Str("url", r.URL.String()).
-					Str("useragent", r.UserAgent()).
-					Str("request_id", ctx.Value(middleware.RequestIDKey).(string)).
-					Str("referer", r.Referer()).
-					Str("proto", r.Proto).
-					Str("remoteIP", ipFromHostPort(r.RemoteAddr)).
-					Int("status", lrw.statusCode).
-					Int("latency_ms", int(latency.Milliseconds())).
-					Send()
+				s.log.InfoContext(ctx, "request",
+					"request_start", start,
+					"method", r.Method,
+					"url", r.URL.String(),
+					"useragent", r.UserAgent(),
+					"request_id", ctx.Value(middleware.RequestIDKey).(string),
+					"referer", r.Referer(),
+					"proto", r.Proto,
+					"remoteIP", ipFromHostPort(r.RemoteAddr),
+					"status", lrw.statusCode,
+					"latency_ms", latency.Milliseconds(),
+				)
 			}()
 
 			next.ServeHTTP(lrw, r)
@@ -116,7 +112,7 @@ func (s *Middleware) Auth() func(http.Handler) http.Handler {
 	return func(next http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 			// CHANGEME you'll want to change this to do stuff.
-			s.log.Info().Msg("AUTH: before request")
+			s.log.Info("AUTH: before request")
 			next.ServeHTTP(w, r)
 		})
 	}