def _log(handler, msg, is_error=False):
"""Logs an error response.
"""
msg = "[{}]: --> {}".format(id(handler), msg)
if is_error:
logger.log_web_error(msg)
else:
logger.log_web(msg)
def process_request(handler, tasks, error_tasks=None):
"""Invokes a set of HTTP request processing tasks.
:param tornado.web.RequestHandler handler: Request processing handler.
:param list tasks: Collection of processing tasks.
:param list error_tasks: Collection of error processing tasks.
"""
# Log request.
msg = "[{0}]: executing --> {1}"
msg = msg.format(id(handler), handler)
logger.log_web(msg)
# Extend tasksets.
tasks = _get_tasks(
[http_validator.validate_request],
tasks,
[_log_success, _write_success]
)
error_tasks = _get_tasks(
[],
error_tasks or [],
[log_error, write_error]
)
# Invoke tasksets:
# ... normal processing;
for task in tasks:
try:
_invoke(handler, task)
except Exception as err:
# ... error processing;
try:
for task in error_tasks:
_invoke(handler, task, err)
# ... error processing exceptions are suppressed
except:
pass
break