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python-urlgrabber/multi-downloader.patch

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diff --git a/scripts/urlgrabber-ext-down b/scripts/urlgrabber-ext-down
new file mode 100755
index 0000000..c37e6a8
--- /dev/null
+++ b/scripts/urlgrabber-ext-down
@@ -0,0 +1,55 @@
+#! /usr/bin/python
+# A very simple external downloader
+
+import time, os, errno, sys
+from urlgrabber.grabber import \
+ _readlines, URLGrabberOptions, _loads, \
+ PyCurlFileObject, URLGrabError
+
+def write(fmt, *arg):
+ try: os.write(1, fmt % arg)
+ except OSError, e:
+ if e.arg[0] != errno.EPIPE: raise
+ sys.exit(1)
+
+class ProxyProgress:
+ def start(self, *d1, **d2):
+ self.next_update = 0
+ def update(self, _amount_read):
+ t = time.time()
+ if t < self.next_update: return
+ self.next_update = t + 0.31
+ write('%d %d\n', self._id, _amount_read)
+
+def main():
+ import signal
+ signal.signal(signal.SIGINT, lambda n, f: sys.exit(1))
+ cnt = 0
+ while True:
+ lines = _readlines(0)
+ if not lines: break
+ for line in lines:
+ cnt += 1
+ opts = URLGrabberOptions()
+ opts._id = cnt
+ for k in line.split(' '):
+ k, v = k.split('=', 1)
+ setattr(opts, k, _loads(v))
+ if opts.progress_obj:
+ opts.progress_obj = ProxyProgress()
+ opts.progress_obj._id = cnt
+ tm = time.time()
+ try:
+ fo = PyCurlFileObject(opts.url, opts.filename, opts)
+ fo._do_grab()
+ fo.fo.close()
+ size = fo._amount_read
+ dlsz = size - fo._reget_length
+ ug_err = 'OK'
+ except URLGrabError, e:
+ size = dlsz = 0
+ ug_err = '%d %s' % e.args
+ write('%d %d %d %.3f %s\n', opts._id, size, dlsz, time.time() - tm, ug_err)
+
+if __name__ == '__main__':
+ main()
diff --git a/setup.py b/setup.py
index d0b87b8..bfa4a18 100644
--- a/setup.py
+++ b/setup.py
@@ -15,8 +15,10 @@ url = _urlgrabber.__url__
packages = ['urlgrabber']
package_dir = {'urlgrabber':'urlgrabber'}
scripts = ['scripts/urlgrabber']
-data_files = [('share/doc/' + name + '-' + version,
- ['README','LICENSE', 'TODO', 'ChangeLog'])]
+data_files = [
+ ('share/doc/' + name + '-' + version, ['README','LICENSE', 'TODO', 'ChangeLog']),
+ ('libexec', ['scripts/urlgrabber-ext-down']),
+]
options = { 'clean' : { 'all' : 1 } }
classifiers = [
'Development Status :: 4 - Beta',
diff --git a/urlgrabber/grabber.py b/urlgrabber/grabber.py
index 38ae1f7..094be77 100644
--- a/urlgrabber/grabber.py
+++ b/urlgrabber/grabber.py
@@ -263,6 +263,33 @@ GENERAL ARGUMENTS (kwargs)
What type of name to IP resolving to use, default is to do both IPV4 and
IPV6.
+ async = (key, limit)
+
+ When this option is set, the urlgrab() is not processed immediately
+ but queued. parallel_wait() then processes grabs in parallel, limiting
+ the numer of connections in each 'key' group to at most 'limit'.
+
+ max_connections
+
+ The global connection limit.
+
+ timedhosts
+
+ The filename of the host download statistics. If defined, urlgrabber
+ will update the stats at the end of every download. At the end of
+ parallel_wait(), the updated stats are saved. If synchronous grabs
+ are used, you should call th_save().
+
+ default_speed, half_life
+
+ These options only affect the async mirror selection code.
+ The default_speed option sets the speed estimate for mirrors
+ we have never downloaded from, and defaults to 1 MBps.
+
+ The speed estimate also drifts exponentially from the speed
+ actually measured to the default speed, with default
+ period of 30 days.
+
RETRY RELATED ARGUMENTS
@@ -343,6 +370,15 @@ RETRY RELATED ARGUMENTS
but it cannot (without severe trickiness) prevent the exception
from being raised.
+ failfunc = None
+
+ The callback that gets called when urlgrab request fails.
+ If defined, urlgrab() calls it instead of raising URLGrabError.
+ Callback syntax is identical to failure_callback.
+
+ Contrary to failure_callback, it's called only once. It's primary
+ purpose is to use urlgrab() without a try/except block.
+
interrupt_callback = None
This callback is called if KeyboardInterrupt is received at any
@@ -444,7 +480,7 @@ import pycurl
from ftplib import parse150
from StringIO import StringIO
from httplib import HTTPException
-import socket
+import socket, select, fcntl
from byterange import range_tuple_normalize, range_tuple_to_header, RangeError
try:
@@ -878,6 +914,7 @@ class URLGrabberOptions:
self.retry = None
self.retrycodes = [-1,2,4,5,6,7]
self.checkfunc = None
+ self.failfunc = _do_raise
self.copy_local = 0
self.close_connection = 0
self.range = None
@@ -886,6 +923,7 @@ class URLGrabberOptions:
self.keepalive = 1
self.proxies = None
self.libproxy = False
+ self.proxy = None
self.reget = None
self.failure_callback = None
self.interrupt_callback = None
@@ -913,6 +951,12 @@ class URLGrabberOptions:
self.size = None # if we know how big the thing we're getting is going
# to be. this is ultimately a MAXIMUM size for the file
self.max_header_size = 2097152 #2mb seems reasonable for maximum header size
+ self.async = None # blocking by default
+ self.mirror_group = None
+ self.max_connections = 5
+ self.timedhosts = None
+ self.half_life = 30*24*60*60 # 30 days
+ self.default_speed = 1e6 # 1 MBit
def __repr__(self):
return self.format()
@@ -932,6 +976,17 @@ class URLGrabberOptions:
s = s + indent + '}'
return s
+def _do_raise(obj):
+ raise obj.exception
+
+def _run_callback(cb, obj):
+ if not cb:
+ return
+ if callable(cb):
+ return cb(obj)
+ cb, arg, karg = cb
+ return cb(obj, *arg, **karg)
+
class URLGrabber(object):
"""Provides easy opening of URLs with a variety of options.
@@ -977,10 +1032,9 @@ class URLGrabber(object):
if DEBUG: DEBUG.info('exception: %s', exception)
if callback:
if DEBUG: DEBUG.info('calling callback: %s', callback)
- cb_func, cb_args, cb_kwargs = self._make_callback(callback)
obj = CallbackObject(exception=exception, url=args[0],
tries=tries, retry=opts.retry)
- cb_func(obj, *cb_args, **cb_kwargs)
+ _run_callback(callback, obj)
if (opts.retry is None) or (tries == opts.retry):
if DEBUG: DEBUG.info('retries exceeded, re-raising')
@@ -1043,30 +1097,36 @@ class URLGrabber(object):
elif not opts.range:
if not opts.checkfunc is None:
- cb_func, cb_args, cb_kwargs = \
- self._make_callback(opts.checkfunc)
- obj = CallbackObject()
- obj.filename = path
- obj.url = url
- apply(cb_func, (obj, )+cb_args, cb_kwargs)
+ obj = CallbackObject(filename=path, url=url)
+ _run_callback(opts.checkfunc, obj)
return path
+ if opts.async:
+ opts.url = url
+ opts.filename = filename
+ opts.size = int(opts.size or 0)
+ _async_queue.append(opts)
+ return filename
+
def retryfunc(opts, url, filename):
+ tm = time.time()
fo = PyCurlFileObject(url, filename, opts)
try:
fo._do_grab()
+ _TH.update(url, fo._amount_read - fo._reget_length, time.time() - tm, None)
if not opts.checkfunc is None:
- cb_func, cb_args, cb_kwargs = \
- self._make_callback(opts.checkfunc)
- obj = CallbackObject()
- obj.filename = filename
- obj.url = url
- apply(cb_func, (obj, )+cb_args, cb_kwargs)
+ obj = CallbackObject(filename=filename, url=url)
+ _run_callback(opts.checkfunc, obj)
finally:
fo.close()
return filename
- return self._retry(opts, retryfunc, url, filename)
+ try:
+ return self._retry(opts, retryfunc, url, filename)
+ except URLGrabError, e:
+ _TH.update(url, 0, 0, e)
+ opts.exception = e
+ return _run_callback(opts.failfunc, opts)
def urlread(self, url, limit=None, **kwargs):
"""read the url into a string, up to 'limit' bytes
@@ -1095,12 +1155,8 @@ class URLGrabber(object):
else: s = fo.read(limit)
if not opts.checkfunc is None:
- cb_func, cb_args, cb_kwargs = \
- self._make_callback(opts.checkfunc)
- obj = CallbackObject()
- obj.data = s
- obj.url = url
- apply(cb_func, (obj, )+cb_args, cb_kwargs)
+ obj = CallbackObject(data=s, url=url)
+ _run_callback(opts.checkfunc, obj)
finally:
fo.close()
return s
@@ -1115,6 +1171,7 @@ class URLGrabber(object):
return s
def _make_callback(self, callback_obj):
+ # not used, left for compatibility
if callable(callback_obj):
return callback_obj, (), {}
else:
@@ -1346,14 +1403,8 @@ class PyCurlFileObject(object):
return
try:
- e = None
self.curl_obj.perform()
- except pycurl.error, e: pass
- self._do_perform_exc(e)
-
- def _do_perform_exc(self, e):
- # handle pycurl exception 'e'
- if e:
+ except pycurl.error, e:
# XXX - break some of these out a bit more clearly
# to other URLGrabErrors from
# http://curl.haxx.se/libcurl/c/libcurl-errors.html
@@ -1607,7 +1658,22 @@ class PyCurlFileObject(object):
_was_filename = False
if type(self.filename) in types.StringTypes and self.filename:
_was_filename = True
- self._do_open_fo()
+ self._prog_reportname = str(self.filename)
+ self._prog_basename = os.path.basename(self.filename)
+
+ if self.append: mode = 'ab'
+ else: mode = 'wb'
+
+ if DEBUG: DEBUG.info('opening local file "%s" with mode %s' % \
+ (self.filename, mode))
+ try:
+ self.fo = open(self.filename, mode)
+ except IOError, e:
+ err = URLGrabError(16, _(\
+ 'error opening local file from %s, IOError: %s') % (self.url, e))
+ err.url = self.url
+ raise err
+
else:
self._prog_reportname = 'MEMORY'
self._prog_basename = 'MEMORY'
@@ -1627,7 +1693,29 @@ class PyCurlFileObject(object):
raise e
if _was_filename:
- self._do_close_fo()
+ # close it up
+ self.fo.flush()
+ self.fo.close()
+
+ # Set the URL where we got it from:
+ if xattr is not None:
+ # See: http://www.freedesktop.org/wiki/CommonExtendedAttributes
+ try:
+ xattr.set(self.filename, 'user.xdg.origin.url', self.url)
+ except:
+ pass # URL too long. = IOError ... ignore everything.
+
+ # set the time
+ mod_time = self.curl_obj.getinfo(pycurl.INFO_FILETIME)
+ if mod_time != -1:
+ try:
+ os.utime(self.filename, (mod_time, mod_time))
+ except OSError, e:
+ err = URLGrabError(16, _(\
+ 'error setting timestamp on file %s from %s, OSError: %s')
+ % (self.filename, self.url, e))
+ err.url = self.url
+ raise err
# re open it
try:
self.fo = open(self.filename, 'r')
@@ -1643,47 +1731,6 @@ class PyCurlFileObject(object):
self._complete = True
- def _do_open_fo(self):
- self._prog_reportname = str(self.filename)
- self._prog_basename = os.path.basename(self.filename)
- if self.append: mode = 'ab'
- else: mode = 'wb'
-
- if DEBUG: DEBUG.info('opening local file "%s" with mode %s' % \
- (self.filename, mode))
- try:
- self.fo = open(self.filename, mode)
- except IOError, e:
- err = URLGrabError(16, _(\
- 'error opening local file from %s, IOError: %s') % (self.url, e))
- err.url = self.url
- raise err
-
- def _do_close_fo(self):
- # close it up
- self.fo.flush()
- self.fo.close()
-
- # Set the URL where we got it from:
- if xattr is not None:
- # See: http://www.freedesktop.org/wiki/CommonExtendedAttributes
- try:
- xattr.set(self.filename, 'user.xdg.origin.url', self.url)
- except:
- pass # URL too long. = IOError ... ignore everything.
-
- # set the time
- mod_time = self.curl_obj.getinfo(pycurl.INFO_FILETIME)
- if mod_time != -1:
- try:
- os.utime(self.filename, (mod_time, mod_time))
- except OSError, e:
- err = URLGrabError(16, _(\
- 'error setting timestamp on file %s from %s, OSError: %s')
- % (self.filename, self.url, e))
- err.url = self.url
- raise err
-
def _fill_buffer(self, amt=None):
"""fill the buffer to contain at least 'amt' bytes by reading
from the underlying file object. If amt is None, then it will
@@ -1858,6 +1905,425 @@ def retrygrab(url, filename=None, copy_local=0, close_connection=0,
#####################################################################
+# Serializer + parser: A replacement of the rather bulky Json code.
+#
+# - handles basic python literals, lists and tuples.
+# - serialized strings never contain ' ' or '\n'
+#
+#####################################################################
+
+_quoter_map = {}
+for c in '%[(,)] \n':
+ _quoter_map[c] = '%%%02x' % ord(c)
+del c
+
+def _dumps(v):
+ if v is None: return 'None'
+ if v is True: return 'True'
+ if v is False: return 'False'
+ if type(v) in (int, long, float):
+ return str(v)
+ if type(v) == unicode:
+ v = v.encode('UTF8')
+ if type(v) == str:
+ def quoter(c): return _quoter_map.get(c, c)
+ return "'%s'" % ''.join(map(quoter, v))
+ if type(v) == tuple:
+ return "(%s)" % ','.join(map(_dumps, v))
+ if type(v) == list:
+ return "[%s]" % ','.join(map(_dumps, v))
+ raise TypeError, 'Can\'t serialize %s' % v
+
+def _loads(s):
+ def decode(v):
+ if v == 'None': return None
+ if v == 'True': return True
+ if v == 'False': return False
+ try: return int(v)
+ except ValueError: pass
+ try: return float(v)
+ except ValueError: pass
+ if len(v) >= 2 and v[0] == v[-1] == "'":
+ ret = []; i = 1
+ while True:
+ j = v.find('%', i)
+ ret.append(v[i:j]) # skips the final "'"
+ if j == -1: break
+ ret.append(chr(int(v[j + 1:j + 3], 16)))
+ i = j + 3
+ v = ''.join(ret)
+ return v
+ stk = None
+ l = []
+ i = j = 0
+ while True:
+ if j == len(s) or s[j] in ',)]':
+ if j > i:
+ l.append(decode(s[i:j]))
+ if j == len(s): break
+ if s[j] in ')]':
+ if s[j] == ')':
+ l = tuple(l)
+ stk[0].append(l)
+ l, stk = stk
+ i = j = j + 1
+ elif s[j] in '[(':
+ stk = l, stk
+ l = []
+ i = j = j + 1
+ else:
+ j += 1 # safe because '[(,)]' are quoted
+ if stk: raise ValueError
+ if len(l) == 1: l = l[0]
+ return l
+
+
+#####################################################################
+# External downloader process
+#####################################################################
+
+def _readlines(fd):
+ buf = os.read(fd, 4096)
+ if not buf: return None
+ # whole lines only, no buffering
+ while buf[-1] != '\n':
+ buf += os.read(fd, 4096)
+ return buf[:-1].split('\n')
+
+import subprocess
+
+class _ExternalDownloader:
+ def __init__(self):
+ self.popen = subprocess.Popen(
+ '/usr/libexec/urlgrabber-ext-down',
+ stdin = subprocess.PIPE,
+ stdout = subprocess.PIPE,
+ )
+ self.stdin = self.popen.stdin.fileno()
+ self.stdout = self.popen.stdout.fileno()
+ self.running = {}
+ self.cnt = 0
+
+ # list of options we pass to downloader
+ _options = (
+ 'url', 'filename',
+ 'timeout', 'close_connection', 'keepalive',
+ 'throttle', 'bandwidth', 'range', 'reget',
+ 'user_agent', 'http_headers', 'ftp_headers',
+ 'proxy', 'prefix', 'username', 'password',
+ 'ssl_ca_cert',
+ 'ssl_cert', 'ssl_cert_type',
+ 'ssl_key', 'ssl_key_type',
+ 'ssl_key_pass',
+ 'ssl_verify_peer', 'ssl_verify_host',
+ 'size', 'max_header_size', 'ip_resolve',
+ )
+
+ def start(self, opts):
+ arg = []
+ for k in self._options:
+ v = getattr(opts, k)
+ if v is None: continue
+ arg.append('%s=%s' % (k, _dumps(v)))
+ if opts.progress_obj:
+ arg.append('progress_obj=True')
+ arg = ' '.join(arg)
+ if DEBUG: DEBUG.info('attempt %i/%s: %s', opts.tries, opts.retry, opts.url)
+
+ self.cnt += 1
+ self.running[self.cnt] = opts
+ os.write(self.stdin, arg +'\n')
+
+ def perform(self):
+ ret = []
+ lines = _readlines(self.stdout)
+ if not lines:
+ if DEBUG: DEBUG.info('downloader died')
+ raise KeyboardInterrupt
+ for line in lines:
+ # parse downloader output
+ line = line.split(' ', 5)
+ _id, size = map(int, line[:2])
+ if len(line) == 2:
+ opts = self.running[_id]
+ m = opts.progress_obj
+ if m:
+ if not m.last_update_time:
+ m.start(text = opts.text)
+ m.update(size)
+ continue
+ # job done
+ opts = self.running.pop(_id)
+ if line[4] == 'OK':
+ ug_err = None
+ if DEBUG: DEBUG.info('success')
+ else:
+ ug_err = URLGrabError(int(line[4]), line[5])
+ if DEBUG: DEBUG.info('failure: %s', err)
+ _TH.update(opts.url, int(line[2]), float(line[3]), ug_err)
+ ret.append((opts, size, ug_err))
+ return ret
+
+ def abort(self):
+ self.popen.stdin.close()
+ self.popen.stdout.close()
+ self.popen.wait()
+
+class _ExternalDownloaderPool:
+ def __init__(self):
+ self.epoll = select.epoll()
+ self.running = {}
+ self.cache = {}
+
+ def start(self, opts):
+ host = urlparse.urlsplit(opts.url).netloc
+ dl = self.cache.pop(host, None)
+ if not dl:
+ dl = _ExternalDownloader()
+ fl = fcntl.fcntl(dl.stdin, fcntl.F_GETFD)
+ fcntl.fcntl(dl.stdin, fcntl.F_SETFD, fl | fcntl.FD_CLOEXEC)
+ self.epoll.register(dl.stdout, select.EPOLLIN)
+ self.running[dl.stdout] = dl
+ dl.start(opts)
+
+ def perform(self):
+ ret = []
+ for fd, event in self.epoll.poll():
+ assert event & select.EPOLLIN
+ done = self.running[fd].perform()
+ if not done: continue
+ assert len(done) == 1
+ ret.extend(done)
+
+ # dl finished, move it to the cache
+ host = urlparse.urlsplit(done[0][0].url).netloc
+ if host in self.cache: self.cache[host].abort()
+ self.epoll.unregister(fd)
+ self.cache[host] = self.running.pop(fd)
+ return ret
+
+ def abort(self):
+ for dl in self.running.values():
+ self.epoll.unregister(dl.stdout)
+ dl.abort()
+ for dl in self.cache.values():
+ dl.abort()
+
+
+#####################################################################
+# High level async API
+#####################################################################
+
+_async_queue = []
+
+def parallel_wait(meter = 'text'):
+ '''Process queued requests in parallel.
+ '''
+
+ if meter:
+ count = total = 0
+ for opts in _async_queue:
+ count += 1
+ total += opts.size
+ if meter == 'text':
+ from progress import TextMultiFileMeter
+ meter = TextMultiFileMeter()
+ meter.start(count, total)
+
+ dl = _ExternalDownloaderPool()
+ host_con = {} # current host connection counts
+
+ def start(opts, tries):
+ key, limit = opts.async
+ host_con[key] = host_con.get(key, 0) + 1
+ opts.tries = tries
+ opts.progress_obj = meter and meter.newMeter()
+ if DEBUG: DEBUG.info('attempt %i/%s: %s', opts.tries, opts.retry, opts.url)
+ dl.start(opts)
+
+ def perform():
+ for opts, size, ug_err in dl.perform():
+ key, limit = opts.async
+ host_con[key] -= 1
+ if meter:
+ m = opts.progress_obj
+ m.basename = os.path.basename(opts.filename)
+ if ug_err:
+ m.failure(ug_err.args[1])
+ else:
+ # file size might have changed
+ meter.re.total += size - opts.size
+ m.end(size)
+ meter.removeMeter(m)
+
+ if ug_err is None:
+ if opts.checkfunc:
+ try: _run_callback(opts.checkfunc, opts)
+ except URLGrabError, ug_err: pass
+ if ug_err is None:
+ continue
+
+ retry = opts.retry or 0
+ if opts.failure_callback:
+ opts.exception = ug_err
+ try: _run_callback(opts.failure_callback, opts)
+ except URLGrabError, ug_err:
+ retry = 0 # no retries
+ if opts.tries < retry and ug_err.args[0] in opts.retrycodes:
+ start(opts, opts.tries + 1) # simple retry
+ continue
+
+ if opts.mirror_group:
+ mg, failed = opts.mirror_group
+ opts.mirror = key
+ opts.exception = ug_err
+ action = _run_callback(mg.failure_callback, opts)
+ if not (action and action.get('fail')):
+ # mask this mirror and retry
+ failed.add(key)
+ _async_queue.append(opts)
+ continue
+
+ # urlgrab failed
+ opts.exception = ug_err
+ _run_callback(opts.failfunc, opts)
+
+ try:
+ idx = 0
+ while True:
+ if idx >= len(_async_queue):
+ # the queue is empty
+ if not dl.running: break
+ # pending dl may extend it
+ perform()
+ continue
+
+ # handle next request
+ opts = _async_queue[idx]
+ idx += 1
+
+ # check global limit
+ while len(dl.running) >= opts.max_connections:
+ perform()
+
+ if opts.mirror_group:
+ mg, failed = opts.mirror_group
+
+ # find the best mirror
+ best = None
+ for mirror in mg.mirrors:
+ key = mirror['mirror']
+ if key in failed: continue
+
+ # estimate mirror speed
+ speed = _TH.estimate(key)
+ speed /= 1 + host_con.get(key, 0)
+ if best is None or speed > best_speed:
+ best = mirror
+ best_speed = speed
+
+ if best is None:
+ opts.exception = URLGrabError(256, _('No more mirrors to try.'))
+ _run_callback(opts.failfunc, opts)
+ continue
+
+ # update the current mirror and limit
+ key = best['mirror']
+ limit = best.get('kwargs', {}).get('max_connections', 3)
+ opts.async = key, limit
+
+ # update URL and proxy
+ url = mg._join_url(key, opts.relative_url)
+ url, parts = opts.urlparser.parse(url, opts)
+ opts.find_proxy(url, parts[0])
+ opts.url = url
+
+ # check host limit, then start
+ key, limit = opts.async
+ while host_con.get(key, 0) >= limit:
+ perform()
+ start(opts, 1)
+ except IOError, e:
+ if e.errno != 4: raise
+ raise KeyboardInterrupt
+
+ finally:
+ dl.abort()
+ if meter: meter.end()
+ del _async_queue[:]
+ _TH.save()
+
+
+#####################################################################
+# Host bandwidth estimation
+#####################################################################
+
+class _TH:
+ hosts = {}
+ dirty = None
+
+ @staticmethod
+ def load():
+ filename = default_grabber.opts.timedhosts
+ if filename and _TH.dirty is None:
+ try:
+ for line in open(filename):
+ host, speed, fail, ts = line.split()
+ _TH.hosts[host] = int(speed), int(fail), int(ts)
+ except IOError: pass
+ _TH.dirty = False
+
+ @staticmethod
+ def save():
+ filename = default_grabber.opts.timedhosts
+ if filename and _TH.dirty is True:
+ tmp = '%s.%d' % (filename, os.getpid())
+ try:
+ f = open(tmp, 'w')
+ for host in _TH.hosts:
+ f.write(host + ' %d %d %d\n' % _TH.hosts[host])
+ f.close()
+ os.rename(tmp, filename)
+ except IOError: pass
+ _TH.dirty = False
+
+ @staticmethod
+ def update(url, dl_size, dl_time, ug_err):
+ _TH.load()
+ host = urlparse.urlsplit(url).netloc
+ speed, fail, ts = _TH.hosts.get(host) or (0, 0, 0)
+ now = time.time()
+
+ if ug_err is None:
+ # k1: the older, the less useful
+ # k2: if it was <1MiB, don't trust it much
+ # speeds vary, use 10:1 smoothing
+ k1 = 2**((ts - now) / default_grabber.opts.half_life)
+ k2 = min(dl_size / 1e6, 1.0) / 10
+ speed = (k1 * speed + k2 * dl_size / dl_time) / (k1 + k2)
+ fail = 0
+ elif getattr(ug_err, 'code', None) == 404:
+ fail = 0 # alive, at least
+ else:
+ fail += 1 # seems dead
+
+ _TH.hosts[host] = speed, fail, now
+ _TH.dirty = True
+
+ @staticmethod
+ def estimate(url):
+ _TH.load()
+ host = urlparse.urlsplit(url).netloc
+ default_speed = default_grabber.opts.default_speed
+ try: speed, fail, ts = _TH.hosts[host]
+ except KeyError: return default_speed
+
+ speed *= 2**-fail
+ k = 2**((ts - time.time()) / default_grabber.opts.half_life)
+ speed = k * speed + (1 - k) * default_speed
+ return speed
+
+#####################################################################
# TESTING
def _main_test():
try: url, filename = sys.argv[1:3]
diff --git a/urlgrabber/mirror.py b/urlgrabber/mirror.py
index 8731aed..d699b61 100644
--- a/urlgrabber/mirror.py
+++ b/urlgrabber/mirror.py
@@ -76,6 +76,9 @@ CUSTOMIZATION
'grabber' is omitted, the default grabber will be used. If
kwargs are omitted, then (duh) they will not be used.
+ kwarg 'max_connections' is used to store the max connection
+ limit of this mirror.
+
3) Pass keyword arguments when instantiating the mirror group.
See, for example, the failure_callback argument.
@@ -91,6 +94,7 @@ import random
import thread # needed for locking to make this threadsafe
from grabber import URLGrabError, CallbackObject, DEBUG, _to_utf8
+from grabber import _run_callback, _do_raise, _async_queue
def _(st):
return st
@@ -254,7 +258,7 @@ class MirrorGroup:
# if these values are found in **kwargs passed to one of the urlXXX
# methods, they will be stripped before getting passed on to the
# grabber
- options = ['default_action', 'failure_callback']
+ options = ['default_action', 'failure_callback', 'failfunc']
def _process_kwargs(self, kwargs):
self.failure_callback = kwargs.get('failure_callback')
@@ -403,10 +407,25 @@ class MirrorGroup:
self._failure(gr, obj)
def urlgrab(self, url, filename=None, **kwargs):
+ if kwargs.get('async'):
+ opts = self.grabber.opts.derive(**kwargs)
+ opts.mirror_group = self, set()
+ opts.relative_url = _to_utf8(url)
+
+ opts.url = 'http://tbd'
+ opts.filename = filename
+ opts.size = int(opts.size or 0)
+ _async_queue.append(opts)
+ return filename
+
kw = dict(kwargs)
kw['filename'] = filename
func = 'urlgrab'
- return self._mirror_try(func, url, kw)
+ try:
+ return self._mirror_try(func, url, kw)
+ except URLGrabError, e:
+ obj = CallbackObject(url=url, filename=filename, exception=e, **kwargs)
+ return _run_callback(kwargs.get('failfunc', _do_raise), obj)
def urlopen(self, url, **kwargs):
kw = dict(kwargs)
diff --git a/urlgrabber/progress.py b/urlgrabber/progress.py
index 3d7e99a..4c126c5 100644
--- a/urlgrabber/progress.py
+++ b/urlgrabber/progress.py
@@ -576,7 +576,6 @@ class TextMultiFileMeter(MultiFileMeter):
self.fo.write(out)
finally:
self._lock.release()
- self._do_update_meter(meter, now)
def _do_failure_meter(self, meter, message, now):
self._lock.acquire()
@@ -599,15 +598,6 @@ class TextMultiFileMeter(MultiFileMeter):
pass
finally:
self._lock.release()
-
- def _do_end(self, now):
- self._do_update_meter(None, now)
- self._lock.acquire()
- try:
- self.fo.write('\n')
- self.fo.flush()
- finally:
- self._lock.release()
######################################################################
# support classes and functions
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