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from tabpy_server.handlers import BaseHandler |
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import json |
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import logging |
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from tabpy_server.common.util import format_exception |
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import requests |
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from tornado import gen |
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from datetime import timedelta |
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9
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10
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class RestrictedTabPy: |
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def __init__(self, protocol, port, logger, timeout): |
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self.protocol = protocol |
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self.port = port |
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self.logger = logger |
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self.timeout = timeout |
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def query(self, name, *args, **kwargs): |
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url = f'{self.protocol}://localhost:{self.port}/query/{name}' |
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self.logger.log(logging.DEBUG, f'Querying {url}...') |
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internal_data = {'data': args or kwargs} |
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data = json.dumps(internal_data) |
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headers = {'content-type': 'application/json'} |
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response = requests.post(url=url, data=data, headers=headers, |
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timeout=self.timeout, |
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verify=False) |
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return response.json() |
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class EvaluationPlaneHandler(BaseHandler): |
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''' |
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EvaluationPlaneHandler is responsible for running arbitrary python scripts. |
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''' |
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def initialize(self, executor, app): |
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super(EvaluationPlaneHandler, self).initialize(app) |
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self.executor = executor |
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self._error_message_timeout = f'User defined script timed out. ' \ |
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f'Timeout is set to {self.eval_timeout} s.' |
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@gen.coroutine |
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def post(self): |
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if self.should_fail_with_not_authorized(): |
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self.fail_with_not_authorized() |
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return |
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self._add_CORS_header() |
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try: |
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body = json.loads(self.request.body.decode('utf-8')) |
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if 'script' not in body: |
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self.error_out(400, 'Script is empty.') |
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return |
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# Transforming user script into a proper function. |
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user_code = body['script'] |
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arguments = None |
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arguments_str = '' |
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if 'data' in body: |
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arguments = body['data'] |
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if arguments is not None: |
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if not isinstance(arguments, dict): |
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self.error_out(400, 'Script parameters need to be ' |
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'provided as a dictionary.') |
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return |
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else: |
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arguments_expected = [] |
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for i in range(1, len(arguments.keys()) + 1): |
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arguments_expected.append('_arg' + str(i)) |
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if sorted(arguments_expected) == sorted(arguments.keys()): |
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arguments_str = ', ' + ', '.join(arguments.keys()) |
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else: |
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self.error_out(400, 'Variables names should follow ' |
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'the format _arg1, _arg2, _argN') |
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return |
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76
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function_to_evaluate = f'def _user_script(tabpy{arguments_str}):\n' |
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for u in user_code.splitlines(): |
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function_to_evaluate += ' ' + u + '\n' |
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self.logger.log( |
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logging.INFO, |
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f'function to evaluate={function_to_evaluate}') |
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try: |
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result = yield self._call_subprocess(function_to_evaluate, |
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arguments) |
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except (gen.TimeoutError, |
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requests.exceptions.ConnectTimeout, |
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requests.exceptions.ReadTimeout): |
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self.logger.log(logging.ERROR, self._error_message_timeout) |
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self.error_out(408, self._error_message_timeout) |
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return |
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if result is None: |
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self.error_out(400, 'Error running script. No return value') |
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else: |
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self.write(json.dumps(result)) |
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self.finish() |
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except Exception as e: |
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err_msg = f'{e.__class__.__name__} : {str(e)}' |
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if err_msg != "KeyError : 'response'": |
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err_msg = format_exception(e, 'POST /evaluate') |
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self.error_out(500, 'Error processing script', info=err_msg) |
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else: |
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self.error_out( |
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404, |
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'Error processing script', |
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info="The endpoint you're " |
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"trying to query did not respond. Please make sure the " |
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"endpoint exists and the correct set of arguments are " |
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"provided.") |
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113
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114
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@gen.coroutine |
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def _call_subprocess(self, function_to_evaluate, arguments): |
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restricted_tabpy = RestrictedTabPy( |
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self.protocol, |
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self.port, |
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self.logger, |
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self.eval_timeout) |
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# Exec does not run the function, so it does not block. |
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exec(function_to_evaluate, globals()) |
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123
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124
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if arguments is None: |
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future = self.executor.submit(_user_script, restricted_tabpy) |
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else: |
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future = self.executor.submit(_user_script, restricted_tabpy, |
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**arguments) |
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129
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130
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ret = yield gen.with_timeout(timedelta(seconds=self.eval_timeout), |
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future) |
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raise gen.Return(ret) |
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tableau /
TabPy
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