Delay opening file until there is data to write

Fixes issue #19.
This commit is contained in:
Ricardo Garcia 2009-06-07 01:11:50 +02:00
parent ff21a710ae
commit 55e7c75e12

View file

@ -305,7 +305,6 @@ class FileDownloader(object):
template_dict = dict(info_dict) template_dict = dict(info_dict)
template_dict['epoch'] = unicode(long(time.time())) template_dict['epoch'] = unicode(long(time.time()))
filename = self.params['outtmpl'] % template_dict filename = self.params['outtmpl'] % template_dict
self.report_destination(filename)
except (ValueError, KeyError), err: except (ValueError, KeyError), err:
self.trouble('ERROR: invalid output template or system charset: %s' % str(err)) self.trouble('ERROR: invalid output template or system charset: %s' % str(err))
if self.params['nooverwrites'] and os.path.exists(filename): if self.params['nooverwrites'] and os.path.exists(filename):
@ -319,17 +318,8 @@ class FileDownloader(object):
return return
try: try:
outstream = open(filename, 'ab') success = self._do_download(filename, info_dict['url'])
except (OSError, IOError), err: except (OSError, IOError), err:
self.trouble('ERROR: unable to open for writing: %s' % str(err))
return
try:
self._do_download(outstream, info_dict['url'])
outstream.close()
except (OSError, IOError), err:
outstream.close()
os.remove(filename)
raise UnavailableFormatError raise UnavailableFormatError
except (urllib2.URLError, httplib.HTTPException, socket.error), err: except (urllib2.URLError, httplib.HTTPException, socket.error), err:
self.trouble('ERROR: unable to download video data: %s' % str(err)) self.trouble('ERROR: unable to download video data: %s' % str(err))
@ -338,6 +328,7 @@ class FileDownloader(object):
self.trouble('ERROR: content too short (expected %s bytes and served %s)' % (err.expected, err.downloaded)) self.trouble('ERROR: content too short (expected %s bytes and served %s)' % (err.expected, err.downloaded))
return return
if success:
try: try:
self.post_process(filename, info_dict) self.post_process(filename, info_dict)
except (PostProcessingError), err: except (PostProcessingError), err:
@ -379,32 +370,36 @@ class FileDownloader(object):
if info is None: if info is None:
break break
def _do_download(self, stream, url): def _do_download(self, filename, url):
stream = None
open_mode = 'ab'
basic_request = urllib2.Request(url, None, std_headers) basic_request = urllib2.Request(url, None, std_headers)
request = urllib2.Request(url, None, std_headers) request = urllib2.Request(url, None, std_headers)
# Resume transfer if filesize is non-zero # Attempt to resume download with "continuedl" option
resume_len = stream.tell() if os.path.isfile(filename):
resume_len = os.path.getsize(filename)
else:
resume_len = 0
if self.params['continuedl'] and resume_len != 0: if self.params['continuedl'] and resume_len != 0:
self.report_resuming_byte(resume_len) self.report_resuming_byte(resume_len)
request.add_header('Range','bytes=%d-' % resume_len) request.add_header('Range','bytes=%d-' % resume_len)
else:
stream.close() # Establish connection
stream = open(stream.name,'wb')
try: try:
data = urllib2.urlopen(request) data = urllib2.urlopen(request)
except urllib2.HTTPError, e: except (urllib2.HTTPError, ), err:
if not e.code == 416: # 416 is 'Requested range not satisfiable' if err.code != 416: # 416 is 'Requested range not satisfiable'
raise raise
data = urllib2.urlopen(basic_request) data = urllib2.urlopen(basic_request)
content_length = data.info()['Content-Length'] content_length = data.info()['Content-Length']
if content_length is not None and long(content_length) == resume_len: if content_length is not None and long(content_length) == resume_len:
self.report_file_already_downloaded(stream.name) self.report_file_already_downloaded(filename)
return return True
else: else:
self.report_unable_to_resume() self.report_unable_to_resume()
stream.close() open_mode = 'wb'
stream = open(stream.name,'wb')
data_len = data.info().get('Content-length', None) data_len = data.info().get('Content-length', None)
data_len_str = self.format_bytes(data_len) data_len_str = self.format_bytes(data_len)
@ -412,12 +407,6 @@ class FileDownloader(object):
block_size = 1024 block_size = 1024
start = time.time() start = time.time()
while True: while True:
# Progress message
percent_str = self.calc_percent(byte_counter, data_len)
eta_str = self.calc_eta(start, time.time(), data_len, byte_counter)
speed_str = self.calc_speed(start, time.time(), byte_counter)
self.report_progress(percent_str, data_len_str, speed_str, eta_str)
# Download and write # Download and write
before = time.time() before = time.time()
data_block = data.read(block_size) data_block = data.read(block_size)
@ -426,15 +415,31 @@ class FileDownloader(object):
if data_block_len == 0: if data_block_len == 0:
break break
byte_counter += data_block_len byte_counter += data_block_len
# Open file just in time
if stream is None:
try:
stream = open(filename, open_mode)
self.report_destination(filename)
except (OSError, IOError), err:
self.trouble('ERROR: unable to open for writing: %s' % str(err))
return False
stream.write(data_block) stream.write(data_block)
block_size = self.best_block_size(after - before, data_block_len) block_size = self.best_block_size(after - before, data_block_len)
# Progress message
percent_str = self.calc_percent(byte_counter, data_len)
eta_str = self.calc_eta(start, time.time(), data_len, byte_counter)
speed_str = self.calc_speed(start, time.time(), byte_counter)
self.report_progress(percent_str, data_len_str, speed_str, eta_str)
# Apply rate limit # Apply rate limit
self.slow_down(start, byte_counter) self.slow_down(start, byte_counter)
self.report_finish() self.report_finish()
if data_len is not None and str(byte_counter) != data_len: if data_len is not None and str(byte_counter) != data_len:
raise ContentTooShortError(byte_counter, long(data_len)) raise ContentTooShortError(byte_counter, long(data_len))
return True
class InfoExtractor(object): class InfoExtractor(object):
"""Information Extractor class. """Information Extractor class.