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logging-middleware.go
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logging-middleware.go
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// A middleware that will allow us to specify log levels from a header.
// Our logging is managed with logger.
// When the header is not present, it will default to the level specified.
// The header looks like x-log-level: debug
package main
import (
"log/slog"
"net/http"
"os"
)
func LoggingMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
level := slog.LevelInfo
if r.Header.Get("x-log-level") != "" {
headerLevel := r.Header.Get("x-log-level")
levelBytes := []byte(headerLevel)
err := level.UnmarshalText(levelBytes)
if err != nil {
slog.Error("Error parsing log level", "Error", err)
} else {
slog.Info("Setting log level", "Level", level)
}
}
// if there is a user logged in, find their sub from the access token
// and add it to the logger
// add details about the request to the logger
logger = slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: level})).With(
"method", r.Method,
"url", r.URL,
"user agent", r.UserAgent())
session, _ := sessionStore.Get(r, "session")
if session.Values["user"] != nil {
logger = logger.With("user", session.Values["user"])
}
next.ServeHTTP(w, r)
})
}