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harvest_utils.py
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harvest_utils.py
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from selenium import webdriver
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By
from selenium.webdriver.remote.webelement import WebElement
from selenium.webdriver.common.proxy import Proxy, ProxyType
import time
from time import sleep
from urllib import parse
from selenium.common.exceptions import NoSuchElementException, \
TimeoutException, StaleElementReferenceException, \
WebDriverException
from selenium.webdriver.support.ui import WebDriverWait,Select
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.common.action_chains import ActionChains
from selenium.webdriver.remote.webelement import WebElement
class Waiter:
def __init__(self,driver):
self._driver =driver
self._wait = WebDriverWait(driver, 60, poll_frequency=3.0)
def Elem(self,css:str) -> WebElement:
return self._wait.until(EC.presence_of_element_located((By.CSS_SELECTOR,css)))
def Elems(self,css:str) -> [WebElement] :
return self._wait.until(EC.presence_of_all_elements_located((By.CSS_SELECTOR,css)))
@staticmethod
def getElemText(e:WebElement,trialCount=20,pollInterval=3,default=None) -> str:
for trial in range(trialCount):
try:
return e.text
except (StaleElementReferenceException, NoSuchElementException, TimeoutException):
sleep(pollInterval)
return default
def Text(self,css:str,trialCount=20,pollInterval=3,default=None) -> str:
try:
e = self.Elem(css)
except TimeoutException:
print('[Waiter.Text]TimeoutException css=%s'%css)
return default
return Waiter.getElemText(e,trialCount,pollInterval,default)
def Texts(self,css:str,trialCount=20,pollInterval=3,default=None) -> [str]:
try:
es = self.Elems(css)
except TimeoutException:
print('[Waiter.Text]TimeoutException css=%s'%css)
return [default]
return [Waiter.getElemText(e,trialCount,pollInterval,default) for e in es]
@staticmethod
def getElemAttrib(e:WebElement,attName:str, trialCount=20,pollInterval=3,default=None) -> str:
for trial in range(trialCount):
try:
return e.get_attribute(attName)
except (StaleElementReferenceException, NoSuchElementException, TimeoutException):
sleep(pollInterval)
return default
def Attrib(self,css:str,attName:str, trialCount=20,pollInterval=3,default=None) -> str:
try:
e = self.Elem(css)
except TimeoutException:
print('[Waiter.Text]TimeoutException css=%s'%css)
return default
return Waiter.getElemAttrib(e,attName,trialCount,pollInterval,default)
def Visible(self,css:str) -> WebElement :
return self._wait.until(EC.visibility_of_element_located((By.CSS_SELECTOR,css)))
def Clickable(self,css:str) -> WebElement :
return self._wait.until(EC.element_to_be_clickable((By.CSS_SELECTOR,css)))
def ElemN(self, css:str, n:int) -> [WebElement] :
for x in range(30):
try:
es = self.elems(css)
if len(es)>=n:
return es
except TimeoutException:
pass
self._driver.execute_script('window.scrollBy(0,800);')
print('window.scrollBy(0,800); sleep(2);')
sleep(2)
print('[Waiter.elemN] Insufficient elements, expected=%d, '
'actual=%d'%(n, len(es)))
raise TimeoutException('[waitElemN] Insufficient elements'
', expected=%d, actual=%d'%(n, len(es)))
def queryAllText(self,css):
n = self._driver.execute_script("return document.querySelectorAll('%(css)s').length"%locals())
txts=[]
for i in range(n):
for trial in range(10):
try:
txt = self._driver.execute_script(
"return document.querySelectorAll('%(css)s')[%(i)d].textContent"%locals())
break
except WebDriverException:
sleep(2)
txts += [txt.strip()]
return txts
def waitTextChanged(self, css:str,oldText:str) -> str:
sign = 1
for x in range(30):
e = self.elem(css)
try:
newText = e.text
if newText != oldText:
return newText
except StaleElementReferenceException:
pass
self._driver.execute_script('window.scrollBy(0,%d);'%( 5*sign ))
print('window.scrollBy(0,%d); sleep(2);'%(5*sign))
sign = -sign;
sleep(2)
raise TimeoutException('[waitTextChanged] oldText="%s", '
'newText="%s"'%(oldText,newText))
# -------
def getFirefox(tempDir='/tmp', showImage=1):
"""get Firefox Webdriver object
:param showImage: 2 = don't show, 1=show
"""
proxy = Proxy(dict(proxyType=ProxyType.AUTODETECT))
profile = webdriver.FirefoxProfile()
profile.set_preference("plugin.state.flash", 0)
profile.set_preference("plugin.state.java", 0)
profile.set_preference("media.autoplay.enabled", False)
# 2=dont_show, 1=normal
profile.set_preference("permissions.default.image", showImage)
profile.set_preference("webdriver.load.strategy", "unstable")
# automatic download
# 2 indicates a custom (see: browser.download.dir) folder.
profile.set_preference("browser.download.folderList", 2)
# whether or not to show the Downloads window when a download begins.
profile.set_preference("browser.download.manager.showWhenStarting", False)
profile.set_preference("browser.download.dir", tempDir)
profile.set_preference("browser.helperApps.neverAsk.saveToDisk",
"application/octet-stream"+\
",application/zip"+\
",application/x-rar-compressed"+\
",application/x-gzip"+\
",application/msword")
return webdriver.Firefox(firefox_profile=profile, proxy=proxy)
def safeFileName(s:str) -> str:
return parse.quote(s, ' (),')
driver=None
def waitElem(css:str,timeOut:float=60) -> WebElement:
global driver
wait = WebDriverWait(driver, timeOut, poll_frequency=3.0)
return wait.until(EC.presence_of_element_located((By.CSS_SELECTOR,css)))
def mouseClick(css:str):
global driver
actions = ActionChains(driver)
el = waitElem(css)
actions.move_to_element(el).click().perform()
def waitVisible(css:str,timeOut:float=60) -> WebElement :
global driver
wait = WebDriverWait(driver, timeOut, poll_frequency=3.0)
return wait.until(EC.visibility_of_element_located((By.CSS_SELECTOR,css)))
def getElems(css:str,timeOut:float=60) -> [WebElement]:
global driver
waitVisible(css,timeOut)
return driver.find_elements_by_css_selector(css)
def getText(css:str,timeOut:int=60)->str:
global driver
interval=3
timeElapsed=0
while timeElapsed < timeOut:
beginTime=time.time()
try:
return driver.execute_script("return "
"document.querySelector('%s').textContent"%css)
except WebDriverException as ex:
print(ex)
time.sleep(interval)
timeElapsed+=(time.time()- beginTime)
return None
def getNumElem(css:str):
global driver
return driver.execute_script("return "
"document.querySelectorAll('%s').length"%css)
def getElemText(elem:WebElement, timeOut:float=60) -> str:
timeElapsed=0
pollFreq=3
while timeElapsed < timeOut:
try:
return elem.text.strip()
except StaleElementReferenceException:
time.sleep(pollFreq)
timeElapsed+=pollFreq
continue
raise TimeoutException("time out getElemText")
def waitText(css:str,timeOut:float=60) -> str :
timeElapsed=0
pollFreq=3
while timeElapsed < timeOut:
beginTime = time.time()
try:
return waitVisible(css, pollFreq).text
except (TimeoutException, StaleElementReferenceException):
time.sleep(pollFreq)
timeElapsed += (time.time()-beginTime)
continue
except Exception as ex:
print(ex)
return None
return None
def waitClickable(css:str, timeOut:float=60) -> WebElement :
global driver
wait = WebDriverWait(driver, timeOut, poll_frequency=3.0)
return wait.until(EC.element_to_be_clickable((By.CSS_SELECTOR,css)))
def waitTextChanged(css:str,oldText:str=None) -> str:
if oldText is None:
oldText=getText(css)
for x in range(20):
newText = getText(css)
if newText != oldText:
return newText
sleep(3)
raise TimeoutException('[waitTextChanged] oldText="%s", '
'newText="%s"'%(oldText,newText))
def dumpSnapshot(msg:str):
global driver
fileTitle = safeFileName(msg)
driver.save_screenshot(fileTitle+'.png')
with open(fileTitle+'.html', 'w', encoding='utf-8-sig') as fout:
fout.write(driver.page_source)