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123456789101112131415161718192021222324252627282930313233package main
// Tiny helpers for stashing a *slog.Logger on a context.Context. The stdlib// doesn't define a context key for slog, so by convention every app rolls// its own — the unexported key type ensures we can't collide with anyone// else's value, and FromContext falls back to slog.Default() so callers// don't need to special-case a missing logger.
import ( "context" "log/slog")
// loggerCtxKey is unexported so only this package can write to the slot.type loggerCtxKey struct{}
// loggerInto returns a copy of ctx that carries logger.func loggerInto(ctx context.Context, logger *slog.Logger) context.Context { return context.WithValue(ctx, loggerCtxKey{}, logger)}
// loggerFrom retrieves the logger attached with loggerInto, or slog.Default// if none has been set.func loggerFrom(ctx context.Context) *slog.Logger { if ctx == nil { return slog.Default() } if l, ok := ctx.Value(loggerCtxKey{}).(*slog.Logger); ok { return l } return slog.Default()}