def upload_file_s3(self, bucket, name, content, meta=None, public=True):
k = AsyncKey(bucket)
k.key = name
if meta:
for meta_key, meta_value in meta.iteritems():
k.set_metadata(meta_key, meta_value)
params = {}
if public:
params['policy'] = 'public-read'
result = yield gen.Task(k.set_contents_from_string, content, **params)
l.info(u"Amazon S3 url: {0}".format(
k.generate_url(expires_in=0, query_auth=False, force_http=True)))
raise gen.Return(result)
