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package logging
import (
"fmt"
"net/http"
"log/slog"
)
// StringValuer returns a Valuer that
// forces the logger to use the type's String
// method, even in json ouput mode.
// By wrapping the type we defer String
// being called to the point we actually log.
func StringerValuer(s fmt.Stringer) slog.LogValuer {
return stringerValuer{s}
}
type stringerValuer struct {
fmt.Stringer
}
func (v stringerValuer) LogValue() slog.Value {
return slog.StringValue(v.String())
}
func requestToAttr(req *http.Request) slog.Attr {
return slog.Group("request",
slog.String("method", req.Method),
slog.Any("url", StringerValuer(req.URL)),
)
}
func responseToAttr(resp *http.Response) slog.Attr {
return slog.Group("response",
slog.String("status", resp.Status),
slog.Int64("content_length", resp.ContentLength),
)
}
// LoggedWriter stores information regarding the response.
// This might be status code, amount of data written or header.
type LoggedWriter interface {
http.ResponseWriter
// Attr is called after the next handler
// in the Middleware returns and
// the complete reponse should have been written.
//
// The returned Attribute should be a [slog.Group]
// containing response Attributes.
Attr() slog.Attr
// Err() is called by the middleware to check
// if the underlying writer returned an error.
// If so, the middleware will print an ERROR line.
Err() error
}
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