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package runtime
import (
"context"
"fmt"
"log/slog"
"reflect"
)
const engagedSourceStart = "Starting EventSource"
type runtimeLogHandler struct {
next slog.Handler
}
func newRuntimeLogHandler(next slog.Handler) slog.Handler {
return runtimeLogHandler{next: next}
}
func (h runtimeLogHandler) Enabled(ctx context.Context, level slog.Level) bool {
return h.next.Enabled(ctx, level)
}
func (h runtimeLogHandler) Handle(ctx context.Context, r slog.Record) error {
level := r.Level
if r.Message == engagedSourceStart && level == slog.LevelInfo {
level = slog.LevelDebug
if !h.next.Enabled(ctx, level) {
return nil
}
}
out := slog.NewRecord(r.Time, level, r.Message, r.PC)
r.Attrs(func(a slog.Attr) bool {
out.AddAttrs(encodableAttr(a))
return true
})
return h.next.Handle(ctx, out)
}
func (h runtimeLogHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
return runtimeLogHandler{next: h.next.WithAttrs(encodableAttrs(attrs))}
}
func (h runtimeLogHandler) WithGroup(name string) slog.Handler {
return runtimeLogHandler{next: h.next.WithGroup(name)}
}
func encodableAttrs(attrs []slog.Attr) []slog.Attr {
out := make([]slog.Attr, len(attrs))
for i, a := range attrs {
out[i] = encodableAttr(a)
}
return out
}
func encodableAttr(a slog.Attr) slog.Attr {
switch a.Value.Kind() {
case slog.KindGroup:
return slog.Attr{Key: a.Key, Value: slog.GroupValue(encodableAttrs(a.Value.Group())...)}
case slog.KindAny:
v := a.Value.Any()
switch reflect.ValueOf(v).Kind() {
case reflect.Func, reflect.Chan, reflect.UnsafePointer:
return slog.String(a.Key, fmt.Sprintf("%T", v))
}
}
return a
}
