python语言磁力搜索引擎源码公开,基于DHT协议

Posted 赤尔宝丁

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       之前我在写百度网盘爬虫百度图片爬虫的时候答应网友说,抽时间要把ok搜搜的的源码公开,如今是时候兑现诺言了,下面就是爬虫的所有代码,完全,彻底的公开,你会不会写程序都可以使用,不过请先装个linux系统,具备公网条件,然后运行: 

python startCrawler.py

有必要提醒你,数据库字段代码中都有,请你自己建张表格,这个太简单了,就不多说了。同时我也提供一下下载地址,源码都在:下载地址1 下载地址2

#!/usr/bin/env python
# encoding: utf-8
"""
author:haoning
create time:2015.8.1
"""
import hashlib
import os
import time
import datetime
import traceback
import sys
import random
import json
import socket
import threading
from hashlib import sha1 #进行hash加密
from random import randint
from struct import unpack
from socket import inet_ntoa
from threading import Timer, Thread
from time import sleep
from collections import deque
from Queue import Queue
 
import mysqldb as mdb  #数据库连接器
 
import metautils
import downloadTorrent
from bencode import bencode, bdecode
import pygeoip
 
DB_HOST = 127.0.0.1
DB_USER = root
DB_PASS = root
 
BOOTSTRAP_NODES = (
    ("67.215.246.10", 6881),
    ("82.221.103.244", 6881),
    ("23.21.224.150", 6881)
)
RATE = 1 #调控速率
TID_LENGTH = 2
RE_JOIN_DHT_INTERVAL = 3
TOKEN_LENGTH = 2
INFO_HASH_LEN = 500000 #50w数据很小,限制内存不至于消耗太大
CACHE_LEN = 100 #更新数据库缓存
WAIT_DOWNLOAD = 80
 
 
geoip = pygeoip.GeoIP(GeoIP.dat)
 
def is_ip_allowed(ip):
    country = geoip.country_code_by_addr(ip)
    if country in (CN,TW,JP,HK, KR):
        return True
    return False
 
def entropy(length):
    return "".join(chr(randint(0, 255)) for _ in xrange(length))
 
def random_id():
    h = sha1()
    h.update(entropy(20))
    return h.digest()
 
 
def decode_nodes(nodes):
    n = []
    length = len(nodes)
    if (length % 26) != 0:
        return n
 
    for i in range(0, length, 26):
        nid = nodes[i:i+20]
        ip = inet_ntoa(nodes[i+20:i+24])
        port = unpack("!H", nodes[i+24:i+26])[0]
        n.append((nid, ip, port))
 
    return n
 
 
def timer(t, f):
    Timer(t, f).start()
 
 
def get_neighbor(target, nid, end=10):
    return target[:end]+nid[end:]
 
 
class KNode(object):
 
    def __init__(self, nid, ip, port):
        self.nid = nid
        self.ip = ip
        self.port = port
 
 
class DHTClient(Thread):
 
    def __init__(self, max_node_qsize):
        Thread.__init__(self)
        self.setDaemon(True)
        self.max_node_qsize = max_node_qsize
        self.nid = random_id()
        self.nodes = deque(maxlen=max_node_qsize)
 
    def send_krpc(self, msg, address):
        try:
            self.ufd.sendto(bencode(msg), address)
        except Exception:
            pass
 
    def send_find_node(self, address, nid=None):
        nid = get_neighbor(nid, self.nid) if nid else self.nid
        tid = entropy(TID_LENGTH)
        msg = {
            "t": tid,
            "y": "q",
            "q": "find_node",
            "a": {
                "id": nid,
                "target": random_id()
            }
        }
        self.send_krpc(msg, address)
 
    def join_DHT(self):
        for address in BOOTSTRAP_NODES:
            self.send_find_node(address)
 
    def re_join_DHT(self):
        if len(self.nodes) == 0:
            self.join_DHT()
        timer(RE_JOIN_DHT_INTERVAL, self.re_join_DHT)
 
    def auto_send_find_node(self):
        wait = 1.0 / self.max_node_qsize
        while True:
            try:
                node = self.nodes.popleft()
                self.send_find_node((node.ip, node.port), node.nid)
            except IndexError:
                pass
            try:
                sleep(wait)
            except KeyboardInterrupt:
                os._exit(0)
 
    def process_find_node_response(self, msg, address):
        nodes = decode_nodes(msg["r"]["nodes"])
        for node in nodes:
            (nid, ip, port) = node
            if len(nid) != 20: continue
            if ip == self.bind_ip: continue
            n = KNode(nid, ip, port)
            self.nodes.append(n)
 
 
class DHTServer(DHTClient): #获得info_hash
 
    def __init__(self, master, bind_ip, bind_port, max_node_qsize):
        DHTClient.__init__(self, max_node_qsize)
 
        self.master = master
        self.bind_ip = bind_ip
        self.bind_port = bind_port
        self.speed=0
 
        self.process_request_actions = {
            "get_peers": self.on_get_peers_request,
            "announce_peer": self.on_announce_peer_request,
        }
 
        self.ufd = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
        self.ufd.bind((self.bind_ip, self.bind_port))
 
        timer(RE_JOIN_DHT_INTERVAL, self.re_join_DHT)
 
 
    def run(self):
        self.re_join_DHT()
        while True:
            try:
                (data, address) = self.ufd.recvfrom(65536)
                msg = bdecode(data)
                self.on_message(msg, address)
            except Exception:
                pass
 
    def on_message(self, msg, address):
        global RATE #设为全局量
        try:
            if msg["y"] == "r":
                if msg["r"].has_key("nodes"):
                    self.process_find_node_response(msg, address) #发现节点
            elif msg["y"] == "q":
                try:
                    self.speed+=1
                    if self.speed % 10000 ==0:
                        RATE=random.randint(1,3)
                        if RATE==2:
                            RATE=1
                        if RATE==3:
                            RATE=10
                        if self.speed>100000:
                            self.speed=0
                    if self.speed % RATE==0: #数据过多,占用cpu太多,划分限速,1,1,10
                        self.process_request_actions[msg["q"]](msg, address) #处理其他节点的请求,这个过程获取info_hash
                    #self.process_request_actions[msg["q"]](msg, address) #处理其他节点的请求,这个过程获取info_hash
                except KeyError:
                    self.play_dead(msg, address)
        except KeyError:
            pass
 
    def on_get_peers_request(self, msg, address):
        try:
            infohash = msg["a"]["info_hash"]
            tid = msg["t"]
            nid = msg["a"]["id"]
            token = infohash[:TOKEN_LENGTH]
            msg = {
                "t": tid,
                "y": "r",
                "r": {
                    "id": get_neighbor(infohash, self.nid),
                    "nodes": "",
                    "token": token
                }
            }
            self.master.log(infohash, address)
            self.send_krpc(msg, address)
        except KeyError:
            pass
 
    def on_announce_peer_request(self, msg, address):
        try:
            infohash = msg["a"]["info_hash"]
            token = msg["a"]["token"]
            nid = msg["a"]["id"]
            tid = msg["t"]
 
            if infohash[:TOKEN_LENGTH] == token:
                if msg["a"].has_key("implied_port ") and msg["a"]["implied_port "] != 0:
                    port = address[1]
                else:
                    port = msg["a"]["port"]
                self.master.log_announce(infohash, (address[0], port))
        except Exception:
            print error
            pass
        finally:
            self.ok(msg, address)
 
    def play_dead(self, msg, address):
        try:
            tid = msg["t"]
            msg = {
                "t": tid,
                "y": "e",
                "e": [202, "Server Error"]
            }
            self.send_krpc(msg, address)
        except KeyError:
            pass
 
    def ok(self, msg, address):
        try:
            tid = msg["t"]
            nid = msg["a"]["id"]
            msg = {
                "t": tid,
                "y": "r",
                "r": {
                    "id": get_neighbor(nid, self.nid)
                }
            }
            self.send_krpc(msg, address)
        except KeyError:
            pass
 
 
class Master(Thread): #解析info_hash
 
    def __init__(self):
        Thread.__init__(self)
        self.setDaemon(True)
        self.queue = Queue()
        self.cache = Queue()
        self.count=0
        self.mutex = threading.RLock() #可重入锁,使单线程可以再次获得已经获得的?
        self.waitDownload = Queue()
        self.metadata_queue = Queue()
        self.dbconn = mdb.connect(DB_HOST, DB_USER, DB_PASS, oksousou, charset=utf8)
        self.dbconn.autocommit(False)
        self.dbcurr = self.dbconn.cursor()
        self.dbcurr.execute(SET NAMES utf8)
        self.visited = set()
                 
    def lock(self): #加锁
        self.mutex.acquire()
 
    def unlock(self): #解锁
        self.mutex.release()
         
    def work(self,item):
 
        print "start thread",item
        while True:
            self.prepare_download_metadata()
            self.lock()
            self.download_metadata()
            self.unlock()
 
            self.lock()
            self.got_torrent()
            self.unlock()
                     
    def start_work(self,max):
     
        for item in xrange(max):
            t = threading.Thread(target=self.work, args=(item,))
            t.setDaemon(True)
            t.start()
         
    #入队的种子效率更高
    def log_announce(self, binhash, address=None):
        if self.queue.qsize() < INFO_HASH_LEN : #大于INFO_HASH_LEN就不要入队,否则后面来不及处理
            if is_ip_allowed(address[0]):
                self.queue.put([address, binhash]) #获得info_hash
         
    def log(self, infohash, address=None):
        if self.queue.qsize() < INFO_HASH_LEN: #大于INFO_HASH_LEN/2就不要入队,否则后面来不及处理
            if is_ip_allowed(address[0]):
                self.queue.put([address, infohash])
     
    def prepare_download_metadata(self):
         
        if self.queue.qsize() == 0:
            sleep(2)
        #从queue中获得info_hash用来下载
        address, binhash= self.queue.get() 
        if binhash in self.visited:
            return
        if len(self.visited) > 100000: #大于100000重置队列,认为已经访问过了
            self.visited = set()
        self.visited.add(binhash)
        #跟新已经访问过的info_hash
        info_hash = binhash.encode(hex)
        utcnow = datetime.datetime.utcnow()
         
        self.cache.put((address,binhash,utcnow)) #装入缓存队列
     
    def download_metadata(self):
     
        if self.cache.qsize() > CACHE_LEN/2: #出队更新下载
            while self.cache.qsize() > 0: #排空队列
                address,binhash,utcnow = self.cache.get()
                info_hash = binhash.encode(hex)
                self.dbcurr.execute(SELECT id FROM search_hash WHERE info_hash=%s, (info_hash,))
                y = self.dbcurr.fetchone()
                if y:
                # 更新最近发现时间,请求数
                    self.dbcurr.execute(UPDATE search_hash SET last_seen=%s, requests=requests+1 WHERE info_hash=%s, (utcnow, info_hash))
                else: 
                    self.waitDownload.put((address, binhash))
            self.dbconn.commit()
            if self.waitDownload.qsize() > WAIT_DOWNLOAD:
                while self.waitDownload.qsize() > 0:
                    address,binhash = self.waitDownload.get()
                    t = threading.Thread(target=downloadTorrent.download_metadata, args=(address, binhash, self.metadata_queue))
                    t.setDaemon(True)
                    t.start()
 
    def decode(self, s):
        if type(s) is list:
            s = ;.join(s)
        u = s
        for x in (self.encoding, utf8, gbk, big5):
            try:
                u = s.decode(x)
                return u
            except:
                pass
        return s.decode(self.encoding, ignore)
 
    def decode_utf8(self, d, i):
        if i+.utf-8 in d:
            return d[i+.utf-8].decode(utf8)
        return self.decode(d[i])
     
    def parse_metadata(self, data): #解析种子
        info = {}
        self.encoding = utf8
        try:
            torrent = bdecode(data) #编码后解析
            if not torrent.get(name):
                return None
        except:
            return None
        detail = torrent
        info[name] = self.decode_utf8(detail, name)
        if files in detail:
            info[files] = []
            for x in detail[files]:
                if path.utf-8 in x:
                    v = {path: self.decode(/.join(x[path.utf-8])), length: x[length]}
                else:
                    v = {path: self.decode(/.join(x[path])), length: x[length]}
                if filehash in x:
                    v[filehash] = x[filehash].encode(hex)
                info[files].append(v)
            info[length] = sum([x[length] for x in info[files]])
        else:
            info[length] = detail[length]
        info[data_hash] = hashlib.md5(detail[pieces]).hexdigest()
        return info
 
    def got_torrent(self):
        if self.metadata_queue.qsize() == 0:
            return
        binhash, address, data,start_time = self.metadata_queue.get()
        if not data:
            return
        try:
            info = self.parse_metadata(data)
            if not info:
                return
        except:
            traceback.print_exc()
            return
 
        temp = time.time()
        x = time.localtime(float(temp))
        utcnow = time.strftime("%Y-%m-%d %H:%M:%S",x) # get time now
         
        info_hash = binhash.encode(hex) #磁力
        info[info_hash] = info_hash
        # need to build tags
        info[tagged] = False
        info[classified] = False
        info[requests] = 1
        info[last_seen] = utcnow
        info[create_time] = utcnow
        info[source_ip] = address[0]
         
        if info.get(files):
            files = [z for z in info[files] if not z[path].startswith(_)]
            if not files:
                files = info[files]
        else:
            files = [{path: info[name], length: info[length]}]
        files.sort(key=lambda z:z[length], reverse=True)
        bigfname = files[0][path]
        info[extension] = metautils.get_extension(bigfname).lower()
        info[category] = metautils.get_category(info[extension])
 
        try:
            try:
                print \n, Saved, info[info_hash], info[name], (time.time()-start_time), s, address[0]
            except:
                print \n, Saved, info[info_hash]
            ret = self.dbcurr.execute(INSERT INTO search_hash(info_hash,category,data_hash,name,extension,classified,source_ip,tagged, + 
                length,create_time,last_seen,requests) VALUES(%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s),
                (info[info_hash], info[category], info[data_hash], info[name], info[extension], info[classified],
                info[source_ip], info[tagged], info[length], info[create_time], info[last_seen], info[requests]))
            if self.count %50 ==0:
                self.dbconn.commit()
                if self.count>100000:
                    self.count=0
        except:
            print self.name, save error, self.name, info
            traceback.print_exc()
            return
 
if __name__ == "__main__":
     
    #启动客户端
    master = Master()
    master.start_work(150)
     
    #启动服务器
    dht = DHTServer(master, "0.0.0.0", 6881, max_node_qsize=200)
    dht.start()
    dht.auto_send_find_node()

注意,上面的代码有一段代码需要下载种子,所以下面的这段代码十分重要:

#!/usr/bin/env python
# encoding: utf-8
"""
author:haoning
create time:2015.8.1
"""
from hashlib import sha1
import math
from socket import inet_ntoa
import socket
from struct import pack, unpack
from threading import Timer, Thread
from time import sleep, time
 
from bencode import bencode, bdecode 
from startCrawler import entropy
 
 
BT_PROTOCOL = "BitTorrent protocol"
BT_MSG_ID = 20
EXT_HANDSHAKE_ID = 0
 
def random_id():
    hash = sha1()
    hash.update(entropy(20))
    return hash.digest()
 
def send_packet(the_socket, msg):
    the_socket.send(msg)
 
def send_message(the_socket, msg):
    msg_len = pack(">I", len(msg))
    send_packet(the_socket, msg_len + msg)
 
def send_handshake(the_socket, infohash):
    bt_header = chr(len(BT_PROTOCOL)) + BT_PROTOCOL
    ext_bytes = "\x00\x00\x00\x00\x00\x10\x00\x00"
    peer_id = random_id()
    packet = bt_header + ext_bytes + infohash + peer_id
 
    send_packet(the_socket, packet)
 
def check_handshake(packet, self_infohash):
    try:
        bt_header_len, packet = ord(packet[:1]), packet[1:]
        if bt_header_len != len(BT_PROTOCOL):
            return False
    except TypeError:
        return False
 
    bt_header, packet = packet[:bt_header_len], packet[bt_header_len:]
    if bt_header != BT_PROTOCOL:
        return False
 
    packet = packet[8:]
    infohash = packet[:20]
    if infohash != self_infohash:
        return False
 
    return True
 
def send_ext_handshake(the_socket):
    msg = chr(BT_MSG_ID) + chr(EXT_HANDSHAKE_ID) + bencode({"m":{"ut_metadata": 1}})
    send_message(the_socket, msg)
 
def request_metadata(the_socket, ut_metadata, piece):
    """bep_0009"""
    msg = chr(BT_MSG_ID) + chr(ut_metadata) + bencode({"msg_type": 0, "piece": piece})
    send_message(the_socket, msg)
 
def get_ut_metadata(data):
    ut_metadata = "_metadata"
    index = data.index(ut_metadata)+len(ut_metadata) + 1
    return int(data[index])
 
def get_metadata_size(data):
    metadata_size = "metadata_size"
    start = data.index(metadata_size) + len(metadata_size) + 1
    data = data[start:]
    return int(data[:data.index("e")])
 
def recvall(the_socket, timeout=5):
    the_socket.setblocking(0)
    total_data = []
    data = ""
    begin = time()
 
    while True:
        sleep(0.05)
        if total_data and time()-begin > ti

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