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searxng/searx/engines/__init__.py

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