#!/usr/bin/python # # Copyright 2009 Google Inc. All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # """Methods for sending and recieving SOAP XML requests.""" __author__ = 'api.sgrinberg@gmail.com (Stan Grinberg)' import httplib import sys import time from aw_api import AUTH_TOKEN_EXPIRE from aw_api import LIB_SHORT_NAME from aw_api import LIB_URL from aw_api import LIB_VERSION from aw_api import SOAPPY from aw_api import ZSI from aw_api import SanityCheck from aw_api import Utils from aw_api.Errors import ERRORS from aw_api.Errors import ApiError from aw_api.Errors import AuthTokenError from aw_api.Errors import Error from aw_api.Errors import ValidationError from aw_api.Logger import Logger from aw_api.SoapBuffer import SoapBuffer class WebService(object): """Implements WebService. Responsible for sending and recieving SOAP XML requests. """ def __init__(self, headers, config, op_config, url, lock, logger=None): """Inits WebService. Args: headers: dict dictionary object with populated authentication credentials. config: dict dictionary object with populated configuration values. op_config: dict dictionary object with additional configuration values for this operation. url: str url of the web service to call. lock: thread.lock the thread lock. logger: Logger the instance of Logger """ self.__headers = headers self.__config = config self.__op_config = op_config self.__url = url self.__lock = lock self.__logger = logger if self.__logger is None: self.__logger = Logger(self.__config['log_home']) if (self.__config['soap_lib'] == SOAPPY and self.__headers.values().count(None) < 2 and (len(self.__headers.values()) > len(set(self.__headers.values())) and not self.__headers.has_key('useragent'))): msg = ('Two (or more) values in \'headers\' dict can not be the same. ' 'See, %s/issues/detail?id=27.' % LIB_URL) raise ValidationError(msg) def __ManageSoap(self, buf, start_time, stop_time, error={}): """Manage SOAP XML message. Args: buf: SoapBuffer SOAP buffer. start_time: str time before service call was invoked. stop_time: str time after service call was invoked. [optional] error: dict error, if any. """ # Update the number of units and operations consumed by API call. if buf.GetCallUnits() and buf.GetCallOperations(): self.__config['units'][0] += int(buf.GetCallUnits()) self.__config['operations'][0] += int(buf.GetCallOperations()) self.__config['last_units'][0] = int(buf.GetCallUnits()) self.__config['last_operations'][0] = int(buf.GetCallOperations()) # Load trace errors, if any. if error and 'trace' in error: error_msg = error['trace'] else: error_msg = '' # Check if response was successful or not. if error and 'data' in error: is_fault = True else: is_fault = False # Forward SOAP XML, errors, and other debugging data to console, external # file, both, or ignore. Each handler supports the following elements, # tag: Config value for this handler. If left empty, will never write # data to file. # target: Target/destination represented by this handler (i.e. FILE, # CONSOLE, etc.). Initially, it should be set to Logger.NONE. # name: Name of the log file to use. # data: Data to write. handlers = [ {'tag': 'xml_log', 'target': Logger.NONE, 'name': 'soap_xml', 'data': str('StartTime: %s\n%s\n%s\n%s\n%s\nEndTime: %s' % (start_time, buf.GetHeadersOut(), buf.GetSOAPOut(), buf.GetHeadersIn(), buf.GetSOAPIn(), stop_time))}, {'tag': 'request_log', 'target': Logger.NONE, 'name': 'request_info', 'data': str('host=%s service=%s method=%s operator=%s responseTime=%s ' 'operations=%s units=%s requestId=%s isFault=%s' % (Utils.GetNetLocFromUrl(self.__url), buf.GetServiceName(), buf.GetCallName(), buf.GetOperatorName(), buf.GetCallResponseTime(), buf.GetCallOperations(), buf.GetCallUnits(), buf.GetCallRequestId(), is_fault))}, {'tag': '', 'target': Logger.NONE, 'name': 'aw_api_lib', 'data': 'DEBUG: %s' % error_msg} ] for handler in handlers: if (handler['tag'] and Utils.BoolTypeConvert(self.__config[handler['tag']])): handler['target'] = Logger.FILE # If debugging is On, raise handler's target two levels, # NONE -> CONSOLE # FILE -> FILE_AND_CONSOLE. if Utils.BoolTypeConvert(self.__config['debug']): handler['target'] += 2 if (handler['target'] != Logger.NONE and handler['data'] and handler['data'] != 'None' and handler['data'] != 'DEBUG: '): self.__logger.Log(handler['name'], handler['data'], log_level=Logger.DEBUG, log_handler=handler['target']) # If raw response is requested, no need to validate and throw appropriate # error. Up to the end user to handle successful or failed request. if Utils.BoolTypeConvert(self.__config['raw_response']): return # Report SOAP fault. if is_fault: try: fault = buf.GetFaultAsDict() if not fault: msg = error['data'] except: fault = None # An error is not a SOAP fault, but check if some other error. if error_msg: msg = error_msg else: msg = ('Unable to parse incoming SOAP XML. Please, file ' 'a bug at %s/issues/list.' % LIB_URL) # Release thread lock. if self.__lock.locked(): self.__lock.release() if not fault and msg: raise Error(msg) # Raise a specific error, subclass of ApiError. if 'detail' in fault: if 'code' in fault['detail']: code = int(fault['detail']['code']) if code in ERRORS: raise ERRORS[code](fault) elif 'errors' in fault['detail']: type = fault['detail']['errors'][0]['type'] if type in ERRORS: raise ERRORS[str(type)](fault) raise ApiError(fault) def CallMethod(self, method_name, params, service_name=None, loc=None, request=None): """Make an API call to specified method. Args: method_name: str API method name. params: list list of parameters to send to the API method. [optional] service_name: str API service name. loc: service locator. request: instance holder of the SOAP request. Returns: tuple/str response from the API method. If 'raw_response' flag enabled a string is returned, tuple otherwise. """ # Acquire thread lock. self.__lock.acquire() try: headers = self.__headers config = self.__config # Temporarily redirect HTTP headers and SOAP from STDOUT into a buffer. buf = SoapBuffer( xml_parser=config['xml_parser'], pretty_xml=Utils.BoolTypeConvert(config['use_pretty_xml'])) old_stdout = sys.stdout sys.stdout = buf start_time = time.strftime('%Y-%m-%d %H:%M:%S') response = () raw_response = '' error = {} try: if Utils.BoolTypeConvert(config['use_strict']): SanityCheck.ValidateHeadersForServer(headers, self.__op_config['server']) # Load/unload version specific authentication and configuration data. if SanityCheck.IsNewApi(self.__op_config['version']): # Set boolean to the format expected by the server, True => true. if 'validateOnly' in headers: headers['validateOnly'] = headers['validateOnly'].lower() # Load/set authentication token. If authentication token has expired, # regenerate it. now = time.time() if (Utils.BoolTypeConvert(config['use_auth_token']) and (('authToken' not in headers and 'auth_token_epoch' not in config) or int(now - config['auth_token_epoch']) >= AUTH_TOKEN_EXPIRE)): headers['authToken'] = Utils.GetAuthToken(headers['email'], headers['password']) config['auth_token_epoch'] = time.time() self.__headers = headers self.__config = config elif not Utils.BoolTypeConvert(config['use_auth_token']): msg = ('Requests via %s require use of authentication token.' % self.__op_config['version']) raise ValidationError(msg) headers = Utils.UnLoadDictKeys(Utils.CleanUpDict(headers), ['email', 'password']) name_space = '/'.join(['https://adwords.google.com/api/adwords', self.__op_config['group'], self.__op_config['version']]) config['ns_target'] = (name_space, 'RequestHeader') else: headers['useragent'] = headers['userAgent'] headers = Utils.UnLoadDictKeys(headers, ['authToken', 'userAgent']) config = Utils.UnLoadDictKeys(config, ['ns_target', 'auth_token_epoch']) # Fire off API request and handle the response. if config['soap_lib'] == SOAPPY: from aw_api.soappy_toolkit import MessageHandler service = MessageHandler.GetServiceConnection( headers, config, self.__url, self.__op_config['http_proxy'], self.__op_config['version']) if not SanityCheck.IsNewApi(self.__op_config['version']): response = MessageHandler.UnpackResponseAsDict( service.invoke(method_name, params)) else: response = MessageHandler.UnpackResponseAsDict( service._callWithBody(MessageHandler.SetRequestParams( config, method_name, params))) elif config['soap_lib'] == ZSI: from aw_api.zsi_toolkit import MessageHandler service = MessageHandler.GetServiceConnection( headers, config, self.__url, self.__op_config['http_proxy'], service_name, loc) request = MessageHandler.SetRequestParams(self.__op_config, request, params) response = MessageHandler.UnpackResponseAsTuple( eval('service.%s(request)' % method_name)) # The response should always be tuple. If it's not, there must be # something wrong with MessageHandler.UnpackResponseAsTuple(). if len(response) == 1 and isinstance(response[0], list): response = tuple(response[0]) if isinstance(response, list): response = tuple(response) elif isinstance(response, tuple): pass else: if response: response = (response,) else: response = () except Exception, e: error['data'] = e stop_time = time.strftime('%Y-%m-%d %H:%M:%S') # Restore STDOUT. sys.stdout = old_stdout # When debugging mode is ON, fetch last traceback. if Utils.BoolTypeConvert(self.__config['debug']): error['trace'] = Utils.LastStackTrace() # Catch local errors prior to going down to the SOAP layer, which may not # exist for this error instance. if 'data' in error and not buf.IsHandshakeComplete(): # Check if buffer contains non-XML data, most likely an HTML page. This # happens in the case of 502 errors (and similar). Otherwise, this is a # local error and API request was never made. html_error = Utils.GetErrorFromHtml(buf.GetBufferAsStr()) if html_error: msg = '%s' % html_error else: msg = str(error['data']) if Utils.BoolTypeConvert(self.__config['debug']): msg += '\n%s' % error['trace'] # When debugging mode is ON, store the raw content of the buffer. if Utils.BoolTypeConvert(self.__config['debug']): error['raw_data'] = buf.GetBufferAsStr() # Catch errors from AuthToken and ValidationError levels, raised during # try/except above. if isinstance(error['data'], AuthTokenError): raise AuthTokenError(msg) elif isinstance(error['data'], ValidationError): raise ValidationError(error['data']) if 'raw_data' in error: msg = '%s [RAW DATA: %s]' % (msg, error['raw_data']) raise Error(msg) if Utils.BoolTypeConvert(self.__config['raw_response']): raw_response = buf.GetRawSOAPIn() self.__ManageSoap(buf, start_time, stop_time, error) finally: # Release thread lock. if self.__lock.locked(): self.__lock.release() if Utils.BoolTypeConvert(self.__config['raw_response']): return raw_response return response def CallRawMethod(self, soap_message): """Make an API call by posting raw SOAP XML message. Args: soap_message: str SOAP XML message. Returns: tuple response from the API method. """ # Acquire thread lock. self.__lock.acquire() try: buf = SoapBuffer( xml_parser=self.__config['xml_parser'], pretty_xml=Utils.BoolTypeConvert(self.__config['use_pretty_xml'])) http_header = { 'post': '%s' % self.__url, 'host': 'sandbox.google.com', 'user_agent': '%s v%s; WebService.py' % (LIB_SHORT_NAME, LIB_VERSION), 'content_type': 'text/xml; charset=\"UTF-8\"', 'content_length': '%d' % len(soap_message), 'soap_action': '' } version = self.__url.split('/')[-2] if SanityCheck.IsNewApi(version): http_header['host'] = 'adwords-%s' % http_header['host'] index = self.__url.find('adwords.google.com') if index > -1: http_header['host'] = 'adwords.google.com' self.__url = ''.join(['https://', http_header['host'], self.__url]) start_time = time.strftime('%Y-%m-%d %H:%M:%S') buf.write( ('%s Outgoing HTTP headers %s\nPOST %s\nHost: %s\nUser-Agent: ' '%s\nContent-type: %s\nContent-length: %s\nSOAPAction: %s\n%s\n%s ' 'Outgoing SOAP %s\n%s\n%s\n' % ('*'*3, '*'*46, http_header['post'], http_header['host'], http_header['user_agent'], http_header['content_type'], http_header['content_length'], http_header['soap_action'], '*'*72, '*'*3, '*'*54, soap_message, '*'*72))) # Construct header and send SOAP message. web_service = httplib.HTTPS(http_header['host']) web_service.putrequest('POST', http_header['post']) web_service.putheader('Host', http_header['host']) web_service.putheader('User-Agent', http_header['user_agent']) web_service.putheader('Content-type', http_header['content_type']) web_service.putheader('Content-length', http_header['content_length']) web_service.putheader('SOAPAction', http_header['soap_action']) web_service.endheaders() web_service.send(soap_message) # Get response. status_code, status_message, header = web_service.getreply() response = web_service.getfile().read() header = str(header).replace('\r', '') buf.write(('%s Incoming HTTP headers %s\n%s %s\n%s\n%s\n%s Incoming SOAP' ' %s\n%s\n%s\n' % ('*'*3, '*'*46, status_code, status_message, header, '*'*72, '*'*3, '*'*54, response, '*'*72))) stop_time = time.strftime('%Y-%m-%d %H:%M:%S') # Catch local errors prior to going down to the SOAP layer, which may not # exist for this error instance. if not buf.IsHandshakeComplete() or not buf.IsSoap(): # The buffer contains non-XML data, most likely an HTML page. This # happens in the case of 502 errors. html_error = Utils.GetErrorFromHtml(buf.GetBufferAsStr()) if html_error: msg = '%s' % html_error else: msg = 'Unknown error.' raise Error(msg) self.__ManageSoap(buf, start_time, stop_time, {'data': buf.GetBufferAsStr()}) finally: # Release thread lock. if self.__lock.locked(): self.__lock.release() return (response,)