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multipart_file_util.py
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#!/usr/bin/env python
# -*- encoding: utf-8 -*-
# @Description: https://www.jianshu.com/p/e0f42bd3a3ea
# @PreInstall:
# @Author : claer
# @File : multipart_file_util.py
# @Version: 1.0.0
# @Time : 2019/10/18 23:23
# @Project: scripts_python
# @Package:
# @Software: PyCharm
import requests
import threading
import os
import time
from . import http_util
def download(url, file_name, headers=http_util.header):
t = DownloadWorkerThread(url, file_name, headers=headers)
t.start()
return t
# 处理单个下载线程
class DownloadWorkerThread(threading.Thread):
thread_count = 5
file_lock = threading.Lock()
file_info_lock = threading.Lock()
def __init__(self, url, file_name, headers={}, thread_count=3):
threading.Thread.__init__(self)
self.content_length = self.get_content_length()
self.range_manager = self.read_range_file()
self.filename = file_name
self.url = url
self.file_info_name = file_name + ".tmp"
self.headers = headers
self.thread_count = thread_count
def run(self):
print(u"Begin Downloading \nurl= " + self.url + "\nfilename = " + self.filename)
if self.url.strip() == "":
return
tlst = []
for i in range(self.thread_count):
t = threading.Thread(target=self.range_worker, args=(self,))
print(u"Start Thread :" + t.getName())
t.setDaemon(True)
t.start()
tlst.append(t)
for t in tlst:
t.join()
def write_content(self, content, content_range):
self.file_lock.acquire()
with open(self.filename, 'rb+') as f:
f.seek(content_range[0])
f.write(content)
self.file_lock.release()
self.file_info_lock.acquire()
self.range_manager.set_written_range(content_range)
self.file_info_lock.release()
def read_next_range(self):
self.file_info_lock.acquire()
time.sleep(0.1)
r = self.range_manager.get_unwritten_range()
self.file_info_lock.release()
return r
def read_range_file(self):
self.file_info_lock.acquire()
manager = None
if os.path.exists(self.file_info_name):
print("read filename ", self.file_info_name)
manager = DownloadWorkerThread.FileInfoManager(self.file_info_name, url=self.url)
self.content_length = manager.get_total_length()
if self.url.strip() == "":
self.url = manager.url_in_file
else:
print("create filename_info length:", str(self.content_length))
with open(self.filename, "wb+") as f:
f.seek(self.content_length)
manager = DownloadWorkerThread.FileInfoManager(self.file_info_name, url=self.url,
filesize=self.content_length)
self.file_info_lock.release()
return manager
def get_content_length(self):
headers = self.headers
headers['Range'] = "bytes=0-1"
length = 0
while length < 1024 * 1024 * 3:
time.sleep(3)
length = int(requests.get(self.url, headers=self.headers).headers['content-Range'].split('/')[1])
print("Get length ", str(length))
return length
def range_worker(self, download_worker):
while True:
content_range = download_worker.read_next_range()
if content_range == 0:
os.remove(self.file_info_name)
print(self.filename + " finished")
break
headers = download_worker.headers
headers['Range'] = "bytes=" + str(content_range[0]) + "-" + str(content_range[1] - 1)
while True:
iTryTimes = 0
r = requests.get(download_worker.url, headers=headers)
if r.ok:
download_worker.write_content(r.content, content_range)
print("We are working on ", self.filename + " and now processing : ",
str(round(1.0 * content_range[1] / self.content_length * 100, 2)) + "% in size ",
str(round(self.content_length / 1024.0 / 1024.0, 2)) + "MB."
)
break
else:
iTryTimes += 1
if iTryTimes > 1:
print("Downloading " + download_worker.url + " error. Now Exit Thread.")
return
def _concat(intervals, new_interval):
if len(intervals) == 0:
return [new_interval]
response = [new_interval]
for interval in intervals:
i = response.pop()
if interval[0] == interval[1]:
continue
if i[0] > interval[1]:
response.append(interval)
response.append(i)
elif i[1] < interval[0]:
response.append(i)
response.append(interval)
else:
response.append((min(i[0], interval[0]), max(i[1], interval[1])))
return response
class FileInfoManager:
url_in_file = ""
writing_range = []
written_range = []
unwritten_range = []
def __init__(self, file_name, url="", file_size=0):
self.filename = file_name
if not os.path.exists(file_name):
with open(file_name, "w") as f:
f.write("unwritten_range=[(0," + str(file_size) + ")]\r\n")
f.write("writing_range=[]\r\n")
f.write("written_range=[]\r\n")
f.write("url_in_file=" + url)
self.unwritten_range.append((0, file_size))
self.url_in_file = url
else:
with open(file_name, "r") as f:
for l in f.readlines():
typ = l.split("=")[0]
if typ == "writing_range":
typ = "unwritten_range"
elif typ == "url_in_file":
if url.strip() == "":
self.url_in_file = l.split("=")[1]
else:
self.url_in_file = url
continue
for tup in l.split("=")[1][1:-3].split('),'):
if tup == "":
continue
if tup.find("(") != 0:
tup = tup[tup.find("("):]
if tup.find(")") != 0:
tup = tup[:tup.find(")")]
getattr(self, typ).append((int(tup.split(",")[0][1:]), int(tup.split(",")[1])))
def get_total_length(self):
if len(self.unwritten_range) > 0:
return self.unwritten_range[-1][1]
elif len(self.writing_range) > 0:
return self.writing_range[-1][1]
elif len(self.written_range) > 0:
return self.written_range[-1][1]
return 0
def _save_to_file(self):
with open(self.filename, "w") as f:
f.write("writing_range=" + str(self.writing_range) + "\r\n")
f.write("unwritten_range=" + str(self.unwritten_range) + "\r\n")
f.write("written_range=" + str(self.written_range) + "\r\n")
f.write("url_in_file=" + self.url_in_file)
def _splice(self, intervals, new_interval):
if len(intervals) == 0:
return []
intervals = _concat(intervals, (0, 0))
response = []
for interval in intervals:
if interval[0] == interval[1]:
continue
if interval[0] > new_interval[1]:
response.append(interval)
elif interval[1] < new_interval[0]:
response.append(interval)
else:
max_range = (min(interval[0], new_interval[0]), max(interval[1], new_interval[1]))
if max_range != new_interval:
left = (min(max_range[0], new_interval[0]), max(max_range[0], new_interval[0]))
right = (min(max_range[1], new_interval[1]), max(max_range[1], new_interval[1]))
if left[0] != left[1]:
response.append(left)
if right[0] != right[1]:
response.append(right)
return response
def get_unwritten_range(self, size=1024 * 1024):
if len(self.unwritten_range) == 0:
return 0
r = self.unwritten_range[0]
r = (r[0], min(r[0] + size, r[1]))
self.unwritten_range = self._splice(self.unwritten_range, r)
self.writing_range = _concat(self.writing_range, r)
self._save_to_file()
return r
def set_written_range(self, content_range):
self.writing_range = self._splice(self.writing_range, content_range)
self.written_range = _concat(self.written_range, content_range)
self._save_to_file()