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47 lines
1.6 KiB
47 lines
1.6 KiB
10 years ago
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import json
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import tornado.web
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import logging
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logger = logging.getLogger('stockintel.' + __name__)
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class BaseHandler(tornado.web.RequestHandler):
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"""A class to collect common handler methods - all other handlers should
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subclass this one.
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"""
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def load_json(self):
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"""Load JSON from the request body and store them in
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self.request.arguments, like Tornado does by default for POSTed form
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parameters.
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If JSON cannot be decoded, raises an HTTPError with status 400.
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"""
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try:
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self.request.arguments = json.loads(self.request.body)
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except ValueError:
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msg = "Could not decode JSON: %s" % self.request.body
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logger.debug(msg)
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raise tornado.web.HTTPError(400, msg)
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def get_json_argument(self, name, default=None):
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"""Find and return the argument with key 'name' from JSON request data.
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Similar to Tornado's get_argument() method.
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"""
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if default is None:
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default = self._ARG_DEFAULT
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if not self.request.arguments:
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self.load_json()
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if name not in self.request.arguments:
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if default is self._ARG_DEFAULT:
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msg = "Missing argument '%s'" % name
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logger.debug(msg)
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raise tornado.web.HTTPError(400, msg)
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logger.debug(
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"Returning default argument %s, as we couldn't find "
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"'%s' in %s" % (default, name, self.request.arguments))
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return default
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arg = self.request.arguments[name]
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logger.debug("Found '%s': %s in JSON arguments" % (name, arg))
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return arg
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