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ParallelFileDownloader.py
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ParallelFileDownloader.py
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import socket
import os
import threading
import math
import sys
from urllib import parse
indexURL = ''
threadCount = 3
if sys.argv[1]:
indexURL = str(sys.argv[1])
# print(indexURL)
if len(sys.argv) == 3:
threadCount = int(str(sys.argv[2]))
def parseURL(url):
url = 'https://' + url
splitUrl = parse.urlsplit(url)
return splitUrl
def getRequest(path, ipAddr):
getReq = "GET " + path + " HTTP/1.0\r\nHost: " + ipAddr + "\r\n\r\n"
getReq = str.encode(getReq)
sock.send(getReq)
def headRequest(path, ipAddr):
headReq = "HEAD " + path + " HTTP/1.0\r\nHost: " + ipAddr + "\r\n\r\n"
headReq = str.encode(headReq)
sock.send(headReq)
def getRangeRequest(lowerBound, upperBound, path, ipAddr):
lowerBound = str(lowerBound)
upperBound = str(upperBound)
getReq = "GET " + path + " HTTP/1.1\r\nHost: " + ipAddr + "\r\n" "Range: bytes= " + lowerBound + '-' + upperBound + "\r\n\r\n"
getReq = str.encode(getReq)
sock.send(getReq)
def getContentLength(fileContent):
length = 0
start = fileContent.find('Content-Length')
end = fileContent.find('Connection', start)
contentLength = fileContent[start:end]
if contentLength:
length = [int(length) for length in contentLength.split() if length.isdigit()]
length = length[0]
return length
def findNumberOfFiles(indexFileData):
flag = True
start = 0
count = 0
while flag:
a = indexFileData.find('www', start)
if a == -1:
flag = False
else:
count += 1
start = a + 1
return count
def thread_function(startByte, endByte, nextIPAddress, nextPath):
getRangeRequest(startByte, endByte, nextPath, nextIPAddress)
fileData = ''
while True:
data = sock.recv(4096)
if not data:
break
fileData += data.decode("utf-8")
# print(fileData)
lineTextData = fileData.rsplit('plain', 1)[-1]
formattedLineTextData = os.linesep.join([s for s in lineTextData.splitlines() if s])
if formattedLineTextData:
fileName = nextPath.rsplit('/', 1)[-1]
textFile = open(fileName, "w+")
textFile.seek(startByte)
textFile.write(formattedLineTextData)
print(str(startByte) + ':' + str(endByte) + '(' + str(endByte + 1) + ')')
if indexURL:
# parse index url
splitUrl = parseURL(indexURL)
urlPath = splitUrl.path
# connect to socket
ipAddress = socket.gethostbyname(splitUrl.netloc)
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((ipAddress, 80))
# get request on index file
getRequest(urlPath, ipAddress)
# get contents of index file
fileData = ''
while True:
data = sock.recv(4096)
if not data:
break
fileData += data.decode("utf-8")
print('URL of the index file: ' + indexURL)
print('Index file is downloaded')
print('There are ' + str(findNumberOfFiles(fileData)) + ' files in the index')
# initialise array of urls from index file
stringOfFiles = fileData
startSecond = stringOfFiles.find('www')
stringOfFiles = stringOfFiles[startSecond:]
arrayOfFiles = stringOfFiles.splitlines()
for i in range(len(arrayOfFiles)):
# parse URL of file
nextUrl = arrayOfFiles[i]
splitNextUrl = parseURL(nextUrl)
nextPath = splitNextUrl.path
nextIPAddress = socket.gethostbyname(splitNextUrl.netloc)
# send HEAD request to check response
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((nextIPAddress, 80))
headRequest(nextPath, nextIPAddress)
# receive response of HEAD request
fileData = ''
while True:
data = sock.recv(4096)
if not data:
break
fileData += data.decode("utf-8")
# print(fileData)
# if head request is 200 OK
if '200 OK' in fileData:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((nextIPAddress, 80))
n = getContentLength(fileData)
print(str(i + 1) + '. ' + nextUrl + ' (size = ' + str(n) + ') is downloaded')
print('File parts:')
if n % threadCount == 0:
byteCount = int(n / threadCount)
for threadNumber in range(threadCount):
start = byteCount * threadNumber
end = start + byteCount - 1
t = threading.Thread(target=thread_function, args=(start, end, nextIPAddress, nextPath))
t.start()
else:
modThreads = n % threadCount
remainingThreads = threadCount - modThreads
floorBytes = math.floor(n / threadCount)
floorBytesAddOne = floorBytes + 1
modEndByte = 0
# modThreads will download floorBytesAddOne
for threadNumber in range(modThreads):
start = floorBytesAddOne * threadNumber
end = start + floorBytesAddOne - 1
modEndByte = end
t = threading.Thread(target=thread_function, args=(start, end, nextIPAddress, nextPath))
t.start()
secondStart = modEndByte + 1
secondEnd = secondStart + floorBytes - 1
# remainingThreads will download floorBytes
for threadNumber in range(remainingThreads):
t = threading.Thread(target=thread_function, args=(secondStart, secondEnd, nextIPAddress, nextPath))
t.start()
secondStart = secondEnd + 1
secondEnd = secondStart + floorBytes - 1
# if head request is 404 not found
else:
print(str(i + 1) + '. ' + nextUrl + ' is not found')
main_thread = threading.current_thread()
for t in threading.enumerate():
if t is main_thread:
continue
t.join()