from os.path import realpath, dirname, splitext, join from os import listdir from imp import load_source import grequests from itertools import izip_longest, chain engine_dir = dirname(realpath(__file__)) engines = {} for filename in listdir(engine_dir): modname = splitext(filename)[0] if filename.startswith('_') or not filename.endswith('.py'): continue filepath = join(engine_dir, filename) engine = load_source(modname, filepath) if not hasattr(engine, 'request') or not hasattr(engine, 'response'): continue engines[modname] = engine def default_request_params(): return {'method': 'GET', 'headers': {}, 'data': {}, 'url': ''} def make_callback(engine_name, results, callback): def process_callback(response, **kwargs): cb_res = [] for result in callback(response): result['engine'] = engine_name cb_res.append(result) results[engine_name] = cb_res return process_callback def search(query, request, selected_engines): global engines requests = [] results = {} user_agent = request.headers.get('User-Agent', '') for ename, engine in engines.items(): if ename not in selected_engines: continue headers = default_request_params() headers['User-Agent'] = user_agent request_params = engine.request(query, headers) callback = make_callback(ename, results, engine.response) if request_params['method'] == 'GET': req = grequests.get(request_params['url'] ,headers=headers ,hooks=dict(response=callback) ) else: req = grequests.post(request_params['url'] ,data=request_params['data'] ,headers=headers ,hooks=dict(response=callback) ) requests.append(req) grequests.map(requests) return list(filter(None, chain(*izip_longest(*results.values()))))