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import logging
import queue
import random
import threading
import time
import requests
from bs4 import BeautifulSoup
class Proxy:
"""Proxy class
Attributes:
addr (str): A string with IP and port, for example '123.123.123.123:8080'
protocol (str): 'http' or 'https'
weight (float): A float point number indicating the probability of being
selected, the weight is based on the connection time and stability
last_checked (time): A UNIX timestamp indicating when the proxy was checked
"""
def __init__(self, addr=None, protocol="http", weight=1.0, last_checked=None):
self.addr = addr
self.protocol = protocol
self.weight = weight
if last_checked is None:
self.last_checked = int(time.time())
else:
self.last_checked = last_checked
def format(self):
"""Return the proxy compatible with requests.Session parameters
Returns:
dict: A dict like {'http': '123.123.123.123:8080'}
"""
return {self.protocol: self.addr}
def to_dict(self):
"""convert detailed proxy info into a dict
Returns:
dict: A dict with four keys: ``addr``, ``protocol``,
``weight`` and ``last_checked``
"""
return dict(addr=self.addr, protocol=self.protocol, weight=self.weight, last_checked=self.last_checked)
class ProxyPool:
"""Proxy pool class
ProxyPool provides friendly apis to manage proxies.
Attributes:
idx (dict): Index for http proxy list and https proxy list.
test_url (dict): A dict containing two urls, when testing if a proxy
is valid, test_url['http'] and test_url['https'] will be used
according to the protocol.
proxies (dict): All the http and https proxies.
addr_list (dict): Address of proxies.
dec_ratio (float): When decreasing the weight of some proxy, its weight
is multiplied with `dec_ratio`.
inc_ratio (float): Similar to `dec_ratio` but used for increasing
weights, default the reciprocal of `dec_ratio`.
weight_thr (float): The minimum weight of a valid proxy, if the weight
of a proxy is lower than `weight_thr`, it will be removed.
logger (Logger): A logging.Logger object used for logging.
"""
def __init__(self, filename=None):
"""Init the pool from a json file.
Args:
filename (str, optional): if the filename is provided, proxies
will be load from it.
"""
self.idx = {"http": 0, "https": 0}
self.test_url = {"http": "http://www.sina.com.cn", "https": "https://www.taobao.com"}
self.proxies = {"http": {}, "https": {}}
self.addr_list = {"http": [], "https": []}
self.dec_ratio = 0.9
self.inc_ratio = 1 / self.dec_ratio
self.weight_thr = 0.2
self.logger = logging.getLogger(__name__)
if filename is not None:
self.load(filename)
def proxy_num(self, protocol=None):
"""Get the number of proxies in the pool
Args:
protocol (str, optional): 'http' or 'https' or None. (default None)
Returns:
If protocol is None, return the total number of proxies, otherwise,
return the number of proxies of corresponding protocol.
"""
http_num = len(self.proxies["http"])
https_num = len(self.proxies["https"])
if protocol == "http":
return http_num
elif protocol == "https":
return https_num
else:
return http_num + https_num
def get_next(self, protocol="http", format=False, policy="loop"):
"""Get the next proxy
Args:
protocol (str): 'http' or 'https'. (default 'http')
format (bool): Whether to format the proxy. (default False)
policy (str): Either 'loop' or 'random', indicating the policy of
getting the next proxy. If set to 'loop', will return proxies
in turn, otherwise will return a proxy randomly.
Returns:
Proxy or dict: If format is true, then return the formatted proxy
which is compatible with requests.Session parameters,
otherwise a Proxy object.
"""
if not self.proxies[protocol]:
return None
if policy == "loop":
idx = self.idx[protocol]
self.idx[protocol] = (idx + 1) % len(self.proxies[protocol])
elif policy == "random":
idx = random.randint(0, self.proxy_num(protocol) - 1)
else:
self.logger.error(f"Unsupported get_next policy: {policy}")
exit()
proxy = self.proxies[protocol][self.addr_list[protocol][idx]]
if proxy.weight < random.random():
return self.get_next(protocol, format, policy)
if format:
return proxy.format()
else:
return proxy
def save(self, filename):
"""Save proxies to file"""
proxies = {"http": [], "https": []}
for protocol in ["http", "https"]:
for proxy in self.proxies[protocol]:
serializable_proxy = self.proxies[protocol][proxy].to_dict()
proxies[protocol].append(serializable_proxy)
with open(filename, "w") as fout:
json.dump(proxies, fout)
def load(self, filename):
"""Load proxies from file"""
with open(filename) as fin:
proxies = json.load(fin)
for protocol in proxies:
for proxy in proxies[protocol]:
self.proxies[protocol][proxy["addr"]] = Proxy(
proxy["addr"], proxy["protocol"], proxy["weight"], proxy["last_checked"]
)
self.addr_list[protocol].append(proxy["addr"])
def add_proxy(self, proxy):
"""Add a valid proxy into pool
You must call `add_proxy` method to add a proxy into pool instead of
directly operate the `proxies` variable.
"""
protocol = proxy.protocol
addr = proxy.addr
if addr in self.proxies:
self.proxies[protocol][addr].last_checked = proxy.last_checked
else:
self.proxies[protocol][addr] = proxy
self.addr_list[protocol].append(addr)
def remove_proxy(self, proxy):
"""Remove a proxy out of the pool"""
del self.search_flag[proxy.protocol][proxy.addr]
del self.addr_list[proxy.protocol][proxy.addr]
def increase_weight(self, proxy):
"""Increase the weight of a proxy by multiplying inc_ratio"""
new_weight = proxy.weight * self.inc_ratio
if new_weight < 1.0:
proxy.weight = new_weight
else:
proxy.weight = 1.0
def decrease_weight(self, proxy):
"""Decreasing the weight of a proxy by multiplying dec_ratio"""
new_weight = proxy.weight * self.dec_ratio
if new_weight < self.weight_thr:
self.remove_proxy(proxy)
else:
proxy.weight = new_weight
def is_valid(self, addr, protocol="http", timeout=5):
"""Check if a proxy is valid
Args:
addr: A string in the form of 'ip:port'
protocol: Either 'http' or 'https', different test urls will be used
according to protocol.
timeout: A integer indicating the timeout of connecting the test url.
Returns:
dict: If the proxy is valid, returns {'valid': True, 'response_time': xx}
otherwise returns {'valid': False, 'msg': 'xxxxxx'}.
"""
start = time.time()
try:
r = requests.get(self.test_url[protocol], timeout=timeout, proxies={protocol: "http://" + addr})
except KeyboardInterrupt:
raise
except requests.exceptions.Timeout:
return {"valid": False, "msg": "timeout"}
except:
return {"valid": False, "msg": "exception"}
else:
if r.status_code == 200:
response_time = time.time() - start
return {"valid": True, "response_time": response_time}
else:
return {"valid": False, "msg": f"status code: {r.status_code}"}
def validate(self, proxy_scanner, expected_num=20, queue_timeout=3, val_timeout=5):
"""Target function of validation threads
Args:
proxy_scanner: A ProxyScanner object.
expected_num: Max number of valid proxies to be scanned.
queue_timeout: Timeout for getting a proxy from the queue.
val_timeout: An integer passed to `is_valid` as argument `timeout`.
"""
while self.proxy_num() < expected_num:
try:
candidate_proxy = proxy_scanner.proxy_queue.get(timeout=queue_timeout)
except queue.Empty:
if proxy_scanner.is_scanning():
continue
else:
break
addr = candidate_proxy["addr"]
protocol = candidate_proxy["protocol"]
ret = self.is_valid(addr, protocol, val_timeout)
if self.proxy_num() >= expected_num:
self.logger.info(f"Enough valid proxies, thread {threading.current_thread().name} exit.")
break
if ret["valid"]:
self.add_proxy(Proxy(addr, protocol))
self.logger.info("{} ok, {:.2f}s".format(addr, ret["response_time"]))
else:
self.logger.info("{} invalid, {}".format(addr, ret["msg"]))
def scan(
self, proxy_scanner, expected_num=20, val_thr_num=4, queue_timeout=3, val_timeout=5, out_file="proxies.json"
):
"""Scan and validate proxies
Firstly, call the `scan` method of `proxy_scanner`, then using multiple
threads to validate them.
Args:
proxy_scanner: A ProxyScanner object.
expected_num: Max number of valid proxies to be scanned.
val_thr_num: Number of threads used for validating proxies.
queue_timeout: Timeout for getting a proxy from the queue.
val_timeout: An integer passed to `is_valid` as argument `timeout`.
out_file: A string or None. If not None, the proxies will be saved
into `out_file`.
"""
try:
proxy_scanner.scan()
self.logger.info(f"starting {val_thr_num} threads to validating proxies...")
val_threads = []
for i in range(val_thr_num):
t = threading.Thread(
name=f"val-{i + 1:0>2d}",
target=self.validate,
kwargs=dict(
proxy_scanner=proxy_scanner,
expected_num=expected_num,
queue_timeout=queue_timeout,
val_timeout=val_timeout,
),
)
t.daemon = True
val_threads.append(t)
t.start()
for t in val_threads:
t.join()
self.logger.info("Proxy scanning done!")
except:
raise
finally:
if out_file is not None:
self.save(out_file)
def default_scan(
self,
region="mainland",
expected_num=20,
val_thr_num=4,
queue_timeout=3,
val_timeout=5,
out_file="proxies.json",
src_files=None,
):
"""Default scan method, to simplify the usage of `scan` method.
It will register following scan functions:
1. scan_file
2. scan_cnproxy (if region is mainland)
3. scan_free_proxy_list (if region is overseas)
4. scan_ip84
5. scan_mimiip
After scanning, all the proxy info will be saved in out_file.
Args:
region: Either 'mainland' or 'overseas'
expected_num: An integer indicating the expected number of proxies,
if this argument is set too great, it may take long to
finish scanning process.
val_thr_num: Number of threads used for validating proxies.
queue_timeout: An integer indicating the timeout for getting a
candidate proxy from the queue.
val_timeout: An integer indicating the timeout when connecting the
test url using a candidate proxy.
out_file: the file name of the output file saving all the proxy info
src_files: A list of file names to scan
"""
if expected_num > 30:
self.logger.warn(
"The more proxy you expect, the more time it "
"will take. It is highly recommended to limit the"
" expected num under 30."
)
proxy_scanner = ProxyScanner()
if src_files is None:
src_files = []
elif isinstance(src_files, str):
src_files = [src_files]
for filename in src_files:
proxy_scanner.register_func(proxy_scanner.scan_file, {"src_file": filename})
if region == "mainland":
proxy_scanner.register_func(proxy_scanner.scan_cnproxy, {})
elif region == "overseas":
proxy_scanner.register_func(proxy_scanner.scan_free_proxy_list, {})
proxy_scanner.register_func(proxy_scanner.scan_ip84, {"region": region, "page": 5})
proxy_scanner.register_func(proxy_scanner.scan_mimiip, {"region": region, "page": 5})
self.scan(proxy_scanner, expected_num, val_thr_num, queue_timeout, val_timeout, out_file)
class ProxyScanner:
"""Proxy scanner class
ProxyScanner focuses on scanning proxy lists from different sources.
Attributes:
proxy_queue: The queue for storing proxies.
scan_funcs: Name of functions to be used in `scan` method.
scan_kwargs: Arguments of functions
scan_threads: A list of `threading.thread` object.
logger: A `logging.Logger` object used for logging.
"""
def __init__(self):
self.proxy_queue = queue.Queue()
self.scan_funcs = []
self.scan_kwargs = []
self.scan_threads = []
self.logger = logging.getLogger(__name__)
def register_func(self, func_name, func_kwargs):
"""Register a scan function
Args:
func_name: The function name of a scan function.
func_kwargs: A dict containing arguments of the scan function.
"""
self.scan_funcs.append(func_name)
self.scan_kwargs.append(func_kwargs)
def scan_ip84(self, region="mainland", page=1):
"""Scan candidate proxies from http://ip84.com
Args:
region: Either 'mainland' or 'overseas'.
page: An integer indicating how many pages to be scanned.
"""
self.logger.info("start scanning http://ip84.com for proxy list...")
for i in range(1, page + 1):
if region == "mainland":
url = f"http://ip84.com/dlgn/{i}"
elif region == "overseas":
url = f"http://ip84.com/gwgn/{i}"
else:
url = f"http://ip84.com/gn/{i}"
response = requests.get(url)
soup = BeautifulSoup(response.content, "lxml")
table = soup.find("table", class_="list")
for tr in table.find_all("tr"):
if tr.th is not None:
continue
info = tr.find_all("td")
protocol = info[4].string.lower()
addr = f"{info[0].string}:{info[1].string}"
self.proxy_queue.put({"addr": addr, "protocol": protocol})
def scan_mimiip(self, region="mainland", page=1):
"""Scan candidate proxies from http://mimiip.com
Args:
region: Either 'mainland' or 'overseas'.
page: An integer indicating how many pages to be scanned.
"""
self.logger.info("start scanning http://mimiip.com for proxy list...")
for i in range(1, page + 1):
if region == "mainland":
url = f"http://www.mimiip.com/gngao/{i}"
elif region == "overseas":
url = f"http://www.mimiip.com/hw/{i}"
else:
url = f"http://www.mimiip.com/gngao/{i}"
response = requests.get(url)
soup = BeautifulSoup(response.content, "lxml")
table = soup.find("table", class_="list")
for tr in table.find_all("tr"):
if tr.th is not None:
continue
info = tr.find_all("td")
protocol = info[4].string.lower()
addr = f"{info[0].string}:{info[1].string}"
self.proxy_queue.put({"addr": addr, "protocol": protocol})
def scan_cnproxy(self):
"""Scan candidate (mainland) proxies from http://cn-proxy.com"""
self.logger.info("start scanning http://cn-proxy.com for proxy list...")
response = requests.get("http://cn-proxy.com")
soup = BeautifulSoup(response.content, "lxml")
tables = soup.find_all("table", class_="sortable")
for table in tables:
for tr in table.tbody.find_all("tr"):
info = tr.find_all("td")
addr = f"{info[0].string}:{info[1].string}"
self.proxy_queue.put({"addr": addr, "protocol": "http"})
def scan_free_proxy_list(self):
"""Scan candidate (overseas) proxies from http://free-proxy-list.net"""
self.logger.info("start scanning http://free-proxy-list.net " "for proxy list...")
response = requests.get("http://free-proxy-list.net")
soup = BeautifulSoup(response.content, "lxml")
table = soup.find("table", id="proxylisttable")
for tr in table.tbody.find_all("tr"):
info = tr.find_all("td")
if info[4].string != "elite proxy":
continue
if info[6].string == "yes":
protocol = "https"
else:
protocol = "http"
addr = f"{info[0].string}:{info[1].string}"
self.proxy_queue.put({"addr": addr, "protocol": protocol})
def scan_file(self, src_file):
"""Scan candidate proxies from an existing file"""
self.logger.info(f"start scanning file {src_file} for proxy list...")
with open(src_file) as fin:
proxies = json.load(fin)
for protocol in proxies.keys():
for proxy in proxies[protocol]:
self.proxy_queue.put({"addr": proxy["addr"], "protocol": protocol})
def is_scanning(self):
"""Return whether at least one scanning thread is alive"""
for t in self.scan_threads:
if t.is_alive():
return True
return False
def scan(self):
"""Start a thread for each registered scan function to scan proxy lists"""
self.logger.info(
"{0} registered scan functions, starting {0} threads "
"to scan candidate proxy lists...".format(len(self.scan_funcs))
)
for i in range(len(self.scan_funcs)):
t = threading.Thread(
name=self.scan_funcs[i].__name__, target=self.scan_funcs[i], kwargs=self.scan_kwargs[i]
)
t.daemon = True
self.scan_threads.append(t)
t.start()
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