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postUtils.py
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postUtils.py
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import os, sys, json, math, csv
import urllib.request
from bs4 import BeautifulSoup
from furl import furl
from collections import namedtuple
from PyQt5 import QtNetwork, QtCore
from PyQt5.QtCore import QUrl, QObject, QThread, pyqtSignal
from functools import partial
class PostDownloader:
def __init__(self, appWindow):
self.saveLocation = None
self.targetPostCount = None
self.responses_raw = None
self.appWindow = appWindow
self.currentRequest = 0
self.totalRequests = 0
self.netManager = QtNetwork.QNetworkAccessManager()
self.postProcessor = ResponsePostProcessor()
self.additionalPostProcessor = AdditionalPostProcessor()
self.thread = QThread()
self.postProcessor.cleanProgressSignal.connect(self.cleanProgressCallback)
self.postProcessor.cleanCompleteSignal.connect(self.cleanCompleteCallback)
self.postProcessor.dumpCompleteSignal.connect(self.killThread)
self.additionalPostProcessor.dumpCompleteSignal.connect(self.killThread)
self.additionalPostProcessor.cleanCompleteSignal.connect(self.cleanCompleteCallback)
def resetDownloader(self):
self.currentRequest = 0
self.totalRequests = 0
self.responses_raw = list()
def updateProgressBar(self):
return
def cleanProgressCallback(self, completeness):
print('cleaning: ', completeness)
return
def cleanCompleteCallback(self):
print('clean complete')
return
#kill thread not being called
def killThread(self):
print('killing thread')
self.thread.quit()
# self.thread.wait()
def __startPP(self, processor, enablePP, connectFunc):
print('starting post processor')
#TODO: generate post processor on the fly?
processor.saveLocation = self.saveLocation
processor.jsonList = self.responses_raw
processor.targetPostCount = self.targetPostCount
processor.enablePP = enablePP
self.thread.started.connect(connectFunc)
self.postProcessor.moveToThread(self.thread)
self.thread.start()
def __probeRequest(self, url):
RequestInfo = namedtuple('RequestInfo', 'code totalPosts')
url.args['per_page'] = 1
connection = urllib.request.urlopen(url.url)
return RequestInfo(connection.getcode(), int(connection.getheader('x-wp-total')))
#sets up relevant parameters for downloading and callback function, then starts first download
#subsequent downloads are done by the callback function/handler
def __downloadChunk(self, url, handler):
self.appWindow.ui.statusBar.showMessage('Downloading, this may take a while... ')
self.resetDownloader()
assert(self.targetPostCount >= -1), 'Assertion failed: postCount invalid'
if(self.targetPostCount == -1):
self.targetPostCount = sys.maxsize #this might be very bad practice D:
info = self.__probeRequest(url)
if(info.code != 200):
print('Error: server responded with code {}'.format(info.code))
raise ConnectionError('Server responded with code {}'.format(info.code))
elif(info.totalPosts == 0):
print('Error: no posts found with the given parameter')
raise ValueError('No posts found with the given parameter')
print('{} posts found'.format(info.totalPosts))
self.totalRequests = math.ceil(min(info.totalPosts, self.targetPostCount) / 100)
self.netManager.finished.connect(handler)
url.args['per_page'] = 100
url.args['offset'] = 0
print('Request: ', url.url)
self.currentRequest += 1
self.netManager.get(QtNetwork.QNetworkRequest(QUrl(url.url)))
def getAdditional(self, url, outfile, convertCsv):
self.saveLocation = outfile
self.targetPostCount = -1
def addRespHandler(reply):
if(reply.error() == QtNetwork.QNetworkReply.NoError):
response_string = str(reply.readAll(), 'utf-8').strip()
if(not response_string):
raise ValueError('Response string is empty') #this error happens when we call the function a second time D:
response_array = json.loads(response_string) #not sure why we need strip() here but not in getJsonList
self.responses_raw += response_array
#TODO: might be better to send signal to AppWindow and let it handle this?
self.appWindow.ui.progressBar.setValue(self.currentRequest / self.totalRequests * 80.0)
if(len(response_array) == 100):
url.args['offset'] += 100
print('Request: ', url.url)
self.currentRequest += 1
self.netManager.get(QtNetwork.QNetworkRequest(QUrl(url.url)))
else:
self.appWindow.ui.statusBar.showMessage('Cleaning up posts, this may take a while... ')
self.__startPP(self.additionalPostProcessor, convertCsv, self.additionalPostProcessor.cleanResponseList)
else:
print('Error occurred: ', reply.error())
print(reply().errorString())
#TODO: raise exception here and let AppWindow handle it
self.__downloadChunk(url, addRespHandler)
# url is a furl object
# use -1 for no postCount limit
def getJsonList(self, url, postCount, saveLocation, enablePP):
self.saveLocation = saveLocation
self.targetPostCount = postCount
def respHandler(reply):
if(reply.error() == QtNetwork.QNetworkReply.NoError):
response_array = json.loads(str(reply.readAll(), 'utf-8'))
self.responses_raw += response_array
#TODO: might be better to send signal to AppWindow and let it handle this?
self.appWindow.ui.progressBar.setValue(self.currentRequest / self.totalRequests * 80.0)
if(len(self.responses_raw) < self.targetPostCount and len(response_array) == 100):
url.args['offset'] += 100
print('Request: ', url.url)
self.currentRequest += 1
self.netManager.get(QtNetwork.QNetworkRequest(QUrl(url.url)))
else:
self.appWindow.ui.statusBar.showMessage('Cleaning up posts, this may take a while... ')
self.__startPP(self.postProcessor, enablePP, self.postProcessor.cleanResponseList)
else:
print('Error occurred: ', reply.error())
print(reply().errorString())
#TODO: raise exception here and let AppWindow handle it
self.__downloadChunk(url, respHandler)
class ResponsePostProcessor(QObject):
cleanProgressSignal = pyqtSignal(float) #currently not used yet
cleanCompleteSignal = pyqtSignal()
dumpCompleteSignal = pyqtSignal()
def __init__(self):
super(ResponsePostProcessor, self).__init__()
self.saveLocation = None
self.jsonList = None
self.targetPostCount = None
self.enablePP = True
def __processComplete(self):
self.saveLocation = None
self.jsonList = None
self.targetPostCount = None
self.dumpCompleteSignal.emit()
def __htmlToPlainText(self, raw_html):
soup = BeautifulSoup(raw_html, 'html5lib')
return soup.get_text()
def __dumpJsonList(self, jsons):
print('dumping file to ', self.saveLocation)
file = open(self.saveLocation, 'w', encoding='utf8')
json.dump(jsons, file, indent=4, sort_keys=True, ensure_ascii=False)
file.close()
self.__processComplete()
def __cleanResponse(self, json):
del json['_links']
del json['comment_status']
json['content_text'] = self.__htmlToPlainText(json['content']['rendered'])
json['excerpt_text'] = self.__htmlToPlainText(json['excerpt']['rendered'])
del json['excerpt']
del json['content']
del json['meta']
del json['status']
del json['sticky']
del json['template']
del json['type']
del json['ping_status']
del json['format']
json['guid'] = json['guid']['rendered']
json['title_text'] = self.__htmlToPlainText(json['title']['rendered'])
del json['title']
return json
def cleanResponseList(self):
if(self.enablePP):
print('cleaning up list')
# listLength = len(jsonList)
# iteration = 0
responses_clean = []
#weird bug here
if(self.jsonList == None):
print('Time travel bug workaround triggered')
return
for x in self.jsonList:
x = self.__cleanResponse(x)
#only include posts with text content
if (x['content_text']):
responses_clean.append(x)
# iteration += 1
# self.cleanProgressSignal.emit(iteration / listLength) #possible bottleneck?
else:
responses_clean = self.jsonList
print('Skipping post processing')
self.cleanCompleteSignal.emit()
if(len(responses_clean) > self.targetPostCount):
self.__dumpJsonList(responses_clean[:self.targetPostCount])
else:
self.__dumpJsonList(responses_clean)
#TODO: some sort of inheritance maybe?
class AdditionalPostProcessor(QObject):
cleanCompleteSignal = pyqtSignal()
dumpCompleteSignal = pyqtSignal()
def __init__(self):
super(AdditionalPostProcessor, self).__init__()
self.saveLocation = None
self.jsonList = None
self.targetPostCount = None #added for compatibility reasons
self.enablePP = True
def __processComplete(self):
self.saveLocation = None
self.jsonList = None
self.targetPostCount = None
self.enablePP = None
self.dumpCompleteSignal.emit()
def __dumpJsonList(self, jsons):
print('dumping file to ', self.saveLocation)
file = open(self.saveLocation, 'w', encoding='utf8')
json.dump(jsons, file, indent=4, sort_keys=True, ensure_ascii=False)
file.close()
def __dumpCsv(self, data):
filename, _ = os.path.splitext(self.saveLocation)
filename += '.csv'
with open(filename, 'w', encoding='utf-8', newline='') as csvfile:
fieldnames = ['id', 'name', 'slug', 'count', 'link']
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
writer.writeheader()
csvRow = {}
for x in data:
csvRow['id'] = x['id']
csvRow['name'] = x['name']
csvRow['slug'] = x['slug']
csvRow['count'] = x['count']
csvRow['link'] = x['link']
writer.writerow(csvRow)
print('Also created csv file {}'.format(filename))
# TODO might want to catch KeyError
def __cleanResponse(self, json):
del json['_links']
del json['meta']
del json['taxonomy']
del json['description']
if 'parent' in json:
del json['parent']
return json
def cleanResponseList(self):
responses_clean = []
#weird bug here
if(self.jsonList == None):
print('Time travel bug workaround triggered - additional PP')
return
for x in self.jsonList:
x = self.__cleanResponse(x)
responses_clean.append(x)
self.cleanCompleteSignal.emit()
self.__dumpJsonList(responses_clean)
self.__dumpCsv(responses_clean)
self.__processComplete()