def save_xhtml(self, xhtml_d):
assert os.path.isdir(self.save_path)
ret_signal = True
self.file_counter += 1
try:
try:
file = self.save_path + str(xhtml_d['netloc']) + "." + str(self.file_counter) + ".html"
f = os.open( file, os.O_CREAT | os.O_WRONLY, stat.S_IWUSR | stat.S_IWGRP | stat.S_IWOTH | stat.S_IRUSR | stat.S_IRGRP | stat.S_IROTH)
except Exception as e:
#Stop the Process First and then raise the Exception with some extra info
self.kill_evt.set()
raise Exception("SCSpider error while Creating file - Error: %s" % e)
#Place a file-object wrapper around the file Descriptor
fobj = os.fdopen(f, "w", 1)
#Place an Encoding Wrapper to assure the file Writing to be performed with UTF-8 encoding
#if xhtml_d['charset']:
# fenc = codecs.EncodedFile(fobj, xhtml_d['charset'])
#else:
fenc = fobj
except Exception as e:
print("SCSpider error while Creating file - Error: %s" % e)
#Return None for the Spider to know that some error occurred for deciding what to do with it
ret_signal = None
else:
try:
fenc.write( xhtml_d['xhtml_s'] ) # Write the source to file
except Exception as e:
print("SCSpider Error while Writing file - Error: %s" % e)
ret_signal = None
finally:
fenc.close()
return ret_signal
def __load_dict(self, filename=None):
#Create a temp dictionary of the seen URLs in 'file'
seen_dict = dict()
try:
try:
f = os.open( self.filespath + filename, os.O_RDONLY)
except Exception as e:
print("DUE Unit: Error while Opening file - Error: %s" % e)
#Return None instead of Dictionary
seen_dict = None
#Place a file-object wrapper around the file Descriptor
fobj = os.fdopen(f, "r", 1)
#Place an Encoding Wrapper to assure the file Writing to be performed with UTF-8 encoding
fenc = codecs.EncodedFile(fobj,'utf-8')
for fileline in fenc:
#Remove Whitespace characters before giving it as key value into seen_dict
url = fileline.rstrip()
seen_dict[ url ] = True
except Exception as e:
print("DUE Unit: Exception occurred while loading file - Error: %s" % e)
#Notify Spider that Something went wrong - Return None instead of Dictionary
seen_dict = None
finally:
#close file in any case
fenc.close()
#return the Dictionary
return seen_dict
def open_tail(self, path, go_to_end=False):
tail = Tail.FileTail()
tail.file_descriptor = os.open(path, os.O_RDONLY | os.O_NONBLOCK)
tail.path = path
if go_to_end:
os.lseek(tail.file_descriptor, 0, os.SEEK_END)
watch_descriptor = self.watch_manager.add_watch(
path, INOTIFY_FILE_MASK, proc_fun=self._inotify_file)
tail.watch_descriptor = watch_descriptor.pop(path)
return tail
def open_tail(self, path, go_to_end=False):
tail = Tail.FileTail()
tail.file_descriptor = os.open(path, os.O_RDONLY | os.O_NONBLOCK)
tail.path = path
if go_to_end:
os.lseek(tail.file_descriptor, 0, os.SEEK_END)
watch_descriptor = self.watch_manager.add_watch(
path, INOTIFY_FILE_MASK,
proc_fun=self._inotify_file)
tail.watch_descriptor = watch_descriptor.pop(path)
return tail
def savetofile(self, filename=None, file_headers=True):
"""savetofile(): Stores the whole hash-url dictionary on hard disk.
This function is recommended to be used externally from a process monitoring and handles the DUEUnit when
the crawler lacks of main memory. Currently the number of dictionary records are recommended to be used as criterion"""
if not filename:
filename = str( self.base_url['netloc'] ) + "." + str( len(self.filelist) ) + ".seenurls"
try:
try:
f = os.open( self.filespath + filename, os.O_CREAT | os.O_WRONLY, stat.S_IWUSR | stat.S_IWGRP | stat.S_IWOTH | stat.S_IRUSR | stat.S_IRGRP | stat.S_IROTH)
except Exception as e:
print("DUE Unit: Error while Creating file - Error: %s" % e)
ret_signal = None
#Place a file-object wrapper around the file Descriptor
fobj = os.fdopen(f, "w", 1)
#Place an Encoding Wrapper to assure the file Writing to be performed with UTF-8 encoding
fenc = codecs.EncodedFile(fobj,'utf-8')
except Exception as e:
print("DUE Unit: Error while Saving file - Error: %s" % e)
#Return None for the Spider to know that some error occurred for deciding what to do with it
ret_signal = None
else:
if file_headers:
header = "BASE URL: " + str( self.base_url['netloc'] ) + "/\n"
#print header
fenc.write(header) #heaser.encode()
#print header
lines = [ url for url in self.seen.keys() ]
for line in lines:
#os.write(f, line)
fenc.write( str(line) + "\n" ) # Write a string to a file #line.encode()
#Adding the new file name in the file list
self.filelist.append(str(filename))
#Clears the seen dictionary
self.seen.clear()
#Return True for the Spider to know that everything went OK
ret_signal = True
finally:
fenc.close()
return ret_signal
else:
os._exit(0)
print "(%s) now daemonized" % (os.getpid(), )
# Close _all_ open (and othewise!) files.
import resource
maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
if maxfd == resource.RLIM_INFINITY:
maxfd = 4096
for fdnum in xrange(maxfd):
try:
os.close(fdnum)
except OSError, e:
if e.errno != errno.EBADF:
raise
# Remap std{in,out,err}
devnull = os.open(os.path.devnull, os.O_RDWR)
oflags = os.O_WRONLY | os.O_CREAT | os.O_APPEND
if devnull != 0: # stdin
os.dup2(devnull, 0)
if options.stdout:
stdout_fd = os.open(options.stdout, oflags)
if stdout_fd != 1:
os.dup2(stdout_fd, 1)
os.close(stdout_fd)
else:
os.dup2(devnull, 1)
if options.stderr:
stderr_fd = os.open(options.stderr, oflags)
if stderr_fd != 2:
os.dup2(stderr_fd, 2)
os.close(stderr_fd)
else:
os._exit(0)
print "(%s) now daemonized" % (os.getpid(),)
# Close _all_ open (and othewise!) files.
import resource
maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
if maxfd == resource.RLIM_INFINITY:
maxfd = 4096
for fdnum in xrange(maxfd):
try:
os.close(fdnum)
except OSError, e:
if e.errno != errno.EBADF:
raise
# Remap std{in,out,err}
devnull = os.open(os.path.devnull, os.O_RDWR)
oflags = os.O_WRONLY | os.O_CREAT | os.O_APPEND
if devnull != 0: # stdin
os.dup2(devnull, 0)
if options.stdout:
stdout_fd = os.open(options.stdout, oflags)
if stdout_fd != 1:
os.dup2(stdout_fd, 1)
os.close(stdout_fd)
else:
os.dup2(devnull, 1)
if options.stderr:
stderr_fd = os.open(options.stderr, oflags)
if stderr_fd != 2:
os.dup2(stderr_fd, 2)
os.close(stderr_fd)
