- if do_refresh:
- # reload the source and regenerate the cache
- cfg = wrap(file(src_path), lambda f: yaml.load(f, default_loader))
- try: wrap(file(cache_path, 'w'), lambda f: f.write(json.write(cfg)))
- except: pass # silent failure
- return cfg
+ if ns.do_refresh:
+ # Atomically reload the source and regenerate the cache. The read and
+ # write must be a single transaction, or a stale version may be
+ # written.
+ @with_lock_file(lock_file)
+ def refresh_cache():
+ import yaml
+ ns.cfg = with_closing(file(src_path)) (
+ lambda f: yaml.load(f, yaml.CSafeLoader))
+ try: with_closing(file(cache_path, 'w')) (
+ lambda f: f.write(json.write(ns.cfg)))
+ except: pass # silent failure
+ return ns.cfg