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Edit: grabber.py

# This library is free software; you can redistribute it and/or # modify it under the terms of the GNU Lesser General Public # License as published by the Free Software Foundation; either # version 2.1 of the License, or (at your option) any later version. # # This library is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU # Lesser General Public License for more details. # # You should have received a copy of the GNU Lesser General Public # License along with this library; if not, write to the # Free Software Foundation, Inc., # 59 Temple Place, Suite 330, # Boston, MA 02111-1307 USA # This file is part of urlgrabber, a high-level cross-protocol url-grabber # Copyright 2002-2004 Michael D. Stenner, Ryan Tomayko # Copyright 2009 Red Hat inc, pycurl code written by Seth Vidal """A high-level cross-protocol url-grabber. GENERAL ARGUMENTS (kwargs) Where possible, the module-level default is indicated, and legal values are provided. copy_local = 0 [0|1] ignored except for file:// urls, in which case it specifies whether urlgrab should still make a copy of the file, or simply point to the existing copy. The module level default for this option is 0. close_connection = 0 [0|1] tells URLGrabber to close the connection after a file has been transferred. This is ignored unless the download happens with the http keepalive handler (keepalive=1). Otherwise, the connection is left open for further use. The module level default for this option is 0 (keepalive connections will not be closed). keepalive = 1 [0|1] specifies whether keepalive should be used for HTTP/1.1 servers that support it. The module level default for this option is 1 (keepalive is enabled). progress_obj = None a class instance that supports the following methods: po.start(filename, url, basename, size, now, text) # length will be None if unknown po.update(read) # read == bytes read so far po.end() multi_progress_obj = None a class instance that supports the following methods: mo.start(total_files, total_size) mo.newMeter() => meter mo.removeMeter(meter) mo.end() The 'meter' object is similar to progress_obj, but multiple instances may be created and updated at the same time. When downloading multiple files in parallel and multi_progress_obj is None progress_obj is used in compatibility mode: finished files are shown but there's no in-progress display. curl_obj = None a pycurl.Curl instance to be used instead of the default module-level instance. Note that you don't have to configure the passed instance in any way; urlgrabber will do all the necessary work. This option exists primarily to allow using urlgrabber from multiple threads in your application, in which case you would want to instantiate a fresh Curl object for each thread, to avoid race conditions. See the curl documentation on thread safety for more information: https://curl.haxx.se/libcurl/c/threadsafe.html Note that connection reuse (keepalive=1) is limited to the Curl instance it was enabled on so if you're using multiple instances in your application, connections won't be shared among them. text = None specifies alternative text to be passed to the progress meter object. If not given, the default progress meter will use the basename of the file. throttle = 1.0 a number - if it's an int, it's the bytes/second throttle limit. If it's a float, it is first multiplied by bandwidth. If throttle == 0, throttling is disabled. If None, the module-level default (which can be set on default_grabber.throttle) is used. See BANDWIDTH THROTTLING for more information. timeout = 300 a positive integer expressing the number of seconds to wait before timing out attempts to connect to a server. If the value is None or 0, connection attempts will not time out. The timeout is passed to the underlying pycurl object as its CONNECTTIMEOUT option, see the curl documentation on CURLOPT_CONNECTTIMEOUT for more information. http://curl.haxx.se/libcurl/c/curl_easy_setopt.html#CURLOPTCONNECTTIMEOUT minrate = 1000 This sets the low speed threshold in bytes per second. If the server is sending data slower than this for at least `timeout' seconds, the library aborts the connection. bandwidth = 0 the nominal max bandwidth in bytes/second. If throttle is a float and bandwidth == 0, throttling is disabled. If None, the module-level default (which can be set on default_grabber.bandwidth) is used. See BANDWIDTH THROTTLING for more information. range = None a tuple of the form (first_byte, last_byte) describing a byte range to retrieve. Either or both of the values may set to None. If first_byte is None, byte offset 0 is assumed. If last_byte is None, the last byte available is assumed. Note that the range specification is python-like in that (0,10) will yield the first 10 bytes of the file. If set to None, no range will be used. reget = None [None|'simple'|'check_timestamp'] whether to attempt to reget a partially-downloaded file. Reget only applies to .urlgrab and (obviously) only if there is a partially downloaded file. Reget has two modes: 'simple' -- the local file will always be trusted. If there are 100 bytes in the local file, then the download will always begin 100 bytes into the requested file. 'check_timestamp' -- the timestamp of the server file will be compared to the timestamp of the local file. ONLY if the local file is newer than or the same age as the server file will reget be used. If the server file is newer, or the timestamp is not returned, the entire file will be fetched. NOTE: urlgrabber can do very little to verify that the partial file on disk is identical to the beginning of the remote file. You may want to either employ a custom "checkfunc" or simply avoid using reget in situations where corruption is a concern. user_agent = 'urlgrabber/VERSION' a string, usually of the form 'AGENT/VERSION' that is provided to HTTP servers in the User-agent header. The module level default for this option is "urlgrabber/VERSION". http_headers = None a tuple of 2-tuples, each containing a header and value. These will be used for http and https requests only. For example, you can do http_headers = (('Pragma', 'no-cache'),) ftp_headers = None this is just like http_headers, but will be used for ftp requests. proxies = None a dictionary that maps protocol schemes to proxy hosts. For example, to use a proxy server on host "foo" port 3128 for http and https URLs: proxies={ 'http' : 'http://foo:3128', 'https' : 'http://foo:3128' } note that proxy authentication information may be provided using normal URL constructs: proxies={ 'http' : 'http://user:host@foo:3128' } libproxy = False Use the libproxy module (if installed) to find proxies. The libproxy code is only used if the proxies dictionary does not provide any proxies. no_cache = False When True, server-side cache will be disabled for http and https requests. This is equivalent to setting http_headers = (('Pragma', 'no-cache'),) prefix = None a url prefix that will be prepended to all requested urls. For example: g = URLGrabber(prefix='http://foo.com/mirror/') g.urlgrab('some/file.txt') ## this will fetch 'http://foo.com/mirror/some/file.txt' This option exists primarily to allow identical behavior to MirrorGroup (and derived) instances. Note: a '/' will be inserted if necessary, so you cannot specify a prefix that ends with a partial file or directory name. opener = None No-op when using the curl backend (default) cache_openers = True No-op when using the curl backend (default) data = None Only relevant for the HTTP family (and ignored for other protocols), this allows HTTP POSTs. When the data kwarg is present (and not None), an HTTP request will automatically become a POST rather than GET. This is done by direct passthrough to urllib2. If you use this, you may also want to set the 'Content-length' and 'Content-type' headers with the http_headers option. Note that python 2.2 handles the case of these badly and if you do not use the proper case (shown here), your values will be overridden with the defaults. urlparser = URLParser() The URLParser class handles pre-processing of URLs, including auth-handling for user/pass encoded in http urls, file handing (that is, filenames not sent as a URL), and URL quoting. If you want to override any of this behavior, you can pass in a replacement instance. See also the 'quote' option. quote = None Whether or not to quote the path portion of a url. quote = 1 -> quote the URLs (they're not quoted yet) quote = 0 -> do not quote them (they're already quoted) quote = None -> guess what to do This option only affects proper urls like 'file:///etc/passwd'; it does not affect 'raw' filenames like '/etc/passwd'. The latter will always be quoted as they are converted to URLs. Also, only the path part of a url is quoted. If you need more fine-grained control, you should probably subclass URLParser and pass it in via the 'urlparser' option. username = None username to use for simple http auth - is automatically quoted for special characters password = None password to use for simple http auth - is automatically quoted for special characters ssl_ca_cert = None this option can be used if M2Crypto is available and will be ignored otherwise. If provided, it will be used to create an SSL context. If both ssl_ca_cert and ssl_context are provided, then ssl_context will be ignored and a new context will be created from ssl_ca_cert. ssl_context = None No-op when using the curl backend (default) ssl_verify_peer = True Check the server's certificate to make sure it is valid with what our CA validates ssl_verify_host = True Check the server's hostname to make sure it matches the certificate DN ssl_key = None Path to the key the client should use to connect/authenticate with ssl_key_type = 'PEM' PEM or DER - format of key ssl_cert = None Path to the ssl certificate the client should use to to authenticate with ssl_cert_type = 'PEM' PEM or DER - format of certificate ssl_key_pass = None password to access the ssl_key size = None size (in bytes) or Maximum size of the thing being downloaded. This is mostly to keep us from exploding with an endless datastream max_header_size = 2097152 Maximum size (in bytes) of the headers. ip_resolve = 'whatever' 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. ftp_disable_epsv = False False, True This options disables Extended Passive Mode (the EPSV command) which does not work correctly on some buggy ftp servers. RETRY RELATED ARGUMENTS retry = None the number of times to retry the grab before bailing. If this is zero, it will retry forever. This was intentional... really, it was :). If this value is not supplied or is supplied but is None retrying does not occur. retrycodes = [-1,2,4,5,6,7] a sequence of errorcodes (values of e.errno) for which it should retry. See the doc on URLGrabError for more details on this. You might consider modifying a copy of the default codes rather than building yours from scratch so that if the list is extended in the future (or one code is split into two) you can still enjoy the benefits of the default list. You can do that with something like this: retrycodes = urlgrabber.grabber.URLGrabberOptions().retrycodes if 12 not in retrycodes: retrycodes.append(12) checkfunc = None a function to do additional checks. This defaults to None, which means no additional checking. The function should simply return on a successful check. It should raise URLGrabError on an unsuccessful check. Raising of any other exception will be considered immediate failure and no retries will occur. If it raises URLGrabError, the error code will determine the retry behavior. Negative error numbers are reserved for use by these passed in functions, so you can use many negative numbers for different types of failure. By default, -1 results in a retry, but this can be customized with retrycodes. If you simply pass in a function, it will be given exactly one argument: a CallbackObject instance with the .url attribute defined and either .filename (for urlgrab) or .data (for urlread). For urlgrab, .filename is the name of the local file. For urlread, .data is the actual string data. If you need other arguments passed to the callback (program state of some sort), you can do so like this: checkfunc=(function, ('arg1', 2), {'kwarg': 3}) if the downloaded file has filename /tmp/stuff, then this will result in this call (for urlgrab): function(obj, 'arg1', 2, kwarg=3) # obj.filename = '/tmp/stuff' # obj.url = 'http://foo.com/stuff' NOTE: both the "args" tuple and "kwargs" dict must be present if you use this syntax, but either (or both) can be empty. failure_callback = None The callback that gets called during retries when an attempt to fetch a file fails. The syntax for specifying the callback is identical to checkfunc, except for the attributes defined in the CallbackObject instance. The attributes for failure_callback are: exception = the raised exception url = the url we're trying to fetch tries = the number of tries so far (including this one) retry = the value of the retry option retry_no_cache = the value of the retry_no_cache option The callback is present primarily to inform the calling program of the failure, but if it raises an exception (including the one it's passed) that exception will NOT be caught and will therefore cause future retries to be aborted. The callback is called for EVERY failure, including the last one. On the last try, the callback can raise an alternate exception, 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 point in the transfer. Basically, this callback can have three impacts on the fetch process based on the way it exits: 1) raise no exception: the current fetch will be aborted, but any further retries will still take place 2) raise a URLGrabError: if you're using a MirrorGroup, then this will prompt a failover to the next mirror according to the behavior of the MirrorGroup subclass. It is recommended that you raise URLGrabError with code 15, 'user abort'. If you are NOT using a MirrorGroup subclass, then this is the same as (3). 3) raise some other exception (such as KeyboardInterrupt), which will not be caught at either the grabber or mirror levels. That is, it will be raised up all the way to the caller. This callback is very similar to failure_callback. They are passed the same arguments, so you could use the same function for both. retry_no_cache = False When True, automatically enable no_cache for future retries if checkfunc performs an unsuccessful check. This option is useful if your application expects a set of files from the same server to form an atomic unit and you write your checkfunc to ensure each file being downloaded belongs to such a unit. If transparent proxy caching is in effect, the files can become out-of-sync, disrupting the atomicity. Enabling this option will prevent that, while ensuring that you still enjoy the benefits of caching when possible. BANDWIDTH THROTTLING urlgrabber supports throttling via two values: throttle and bandwidth Between the two, you can either specify and absolute throttle threshold or specify a theshold as a fraction of maximum available bandwidth. throttle is a number - if it's an int, it's the bytes/second throttle limit. If it's a float, it is first multiplied by bandwidth. If throttle == 0, throttling is disabled. If None, the module-level default (which can be set with set_throttle) is used. bandwidth is the nominal max bandwidth in bytes/second. If throttle is a float and bandwidth == 0, throttling is disabled. If None, the module-level default (which can be set with set_bandwidth) is used. Note that when multiple downloads run simultaneously (multiprocessing or the parallel urlgrab() feature is used) the total bandwidth might exceed the throttle limit. You may want to also set max_connections=1 or scale your throttle option down accordingly. THROTTLING EXAMPLES: Lets say you have a 100 Mbps connection. This is (about) 10^8 bits per second, or 12,500,000 Bytes per second. You have a number of throttling options: *) set_bandwidth(12500000); set_throttle(0.5) # throttle is a float This will limit urlgrab to use half of your available bandwidth. *) set_throttle(6250000) # throttle is an int This will also limit urlgrab to use half of your available bandwidth, regardless of what bandwidth is set to. *) set_throttle(6250000); set_throttle(1.0) # float Use half your bandwidth *) set_throttle(6250000); set_throttle(2.0) # float Use up to 12,500,000 Bytes per second (your nominal max bandwidth) *) set_throttle(6250000); set_throttle(0) # throttle = 0 Disable throttling - this is more efficient than a very large throttle setting. *) set_throttle(0); set_throttle(1.0) # throttle is float, bandwidth = 0 Disable throttling - this is the default when the module is loaded. SUGGESTED AUTHOR IMPLEMENTATION (THROTTLING) While this is flexible, it's not extremely obvious to the user. I suggest you implement a float throttle as a percent to make the distinction between absolute and relative throttling very explicit. Also, you may want to convert the units to something more convenient than bytes/second, such as kbps or kB/s, etc. """ import os import sys import urlparse import time import string import urllib import urllib2 from httplib import responses import mimetools import thread import types import stat import pycurl from ftplib import parse150 from StringIO import StringIO from httplib import HTTPException import socket, select, fcntl from byterange import range_tuple_normalize, range_tuple_to_header, RangeError try: import xattr if not hasattr(xattr, 'set'): xattr = None # This is a "newer" API. except ImportError: xattr = None ######################################################################## # MODULE INITIALIZATION ######################################################################## try: exec('from ' + (__name__.split('.'))[0] + ' import __version__') except: __version__ = '???' try: # this part isn't going to do much - need to talk to gettext from i18n import _ except ImportError, msg: def _(st): return st ######################################################################## # functions for debugging output. These functions are here because they # are also part of the module initialization. DEBUG = None def set_logger(DBOBJ): """Set the DEBUG object. This is called by _init_default_logger when the environment variable URLGRABBER_DEBUG is set, but can also be called by a calling program. Basically, if the calling program uses the logging module and would like to incorporate urlgrabber logging, then it can do so this way. It's probably not necessary as most internal logging is only for debugging purposes. The passed-in object should be a logging.Logger instance. It will be pushed into the keepalive and byterange modules if they're being used. The mirror module pulls this object in on import, so you will need to manually push into it. In fact, you may find it tidier to simply push your logging object (or objects) into each of these modules independently. """ global DEBUG DEBUG = DBOBJ def _init_default_logger(logspec=None): '''Examines the environment variable URLGRABBER_DEBUG and creates a logging object (logging.logger) based on the contents. It takes the form URLGRABBER_DEBUG=level,filename where "level" can be either an integer or a log level from the logging module (DEBUG, INFO, etc). If the integer is zero or less, logging will be disabled. Filename is the filename where logs will be sent. If it is "-", then stdout will be used. If the filename is empty or missing, stderr will be used. If the variable cannot be processed or the logging module cannot be imported (python < 2.3) then logging will be disabled. Here are some examples: URLGRABBER_DEBUG=1,debug.txt # log everything to debug.txt URLGRABBER_DEBUG=WARNING,- # log warning and higher to stdout URLGRABBER_DEBUG=INFO # log info and higher to stderr This function is called during module initialization. It is not intended to be called from outside. The only reason it is a function at all is to keep the module-level namespace tidy and to collect the code into a nice block.''' try: if logspec is None: logspec = os.environ['URLGRABBER_DEBUG'] dbinfo = logspec.split(',') import logging level = logging._levelNames.get(dbinfo[0], None) if level is None: level = int(dbinfo[0]) if level < 1: raise ValueError() formatter = logging.Formatter('%(asctime)s %(message)s') if len(dbinfo) > 1: filename = dbinfo[1] else: filename = '' if filename == '': handler = logging.StreamHandler(sys.stderr) elif filename == '-': handler = logging.StreamHandler(sys.stdout) else: handler = logging.FileHandler(filename) handler.setFormatter(formatter) DBOBJ = logging.getLogger('urlgrabber') DBOBJ.propagate = False DBOBJ.addHandler(handler) DBOBJ.setLevel(level) except (KeyError, ImportError, ValueError): DBOBJ = None set_logger(DBOBJ) def _log_package_state(): if not DEBUG: return DEBUG.debug('urlgrabber version = %s' % __version__) DEBUG.debug('trans function "_" = %s' % _) _init_default_logger() _log_package_state() # normally this would be from i18n or something like it ... def _(st): return st ######################################################################## # END MODULE INITIALIZATION ######################################################################## ######################################################################## # UTILITY FUNCTIONS ######################################################################## # These functions are meant to be utilities for the urlgrabber library to use. def _to_utf8(obj, errors='replace'): '''convert 'unicode' to an encoded utf-8 byte string ''' # stolen from yum.i18n if isinstance(obj, unicode): obj = obj.encode('utf-8', errors) return obj def exception2msg(e): try: return str(e) except UnicodeEncodeError: # always use byte strings return unicode(e).encode('utf8') ######################################################################## # END UTILITY FUNCTIONS ######################################################################## class URLGrabError(IOError): """ URLGrabError error codes: URLGrabber error codes (0 -- 255) 0 - everything looks good (you should never see this) 1 - malformed url 2 - local file doesn't exist 3 - request for non-file local file (dir, etc) 4 - IOError on fetch 5 - OSError on fetch 6 - no content length header when we expected one 7 - HTTPException 8 - Exceeded read limit (for urlread) 9 - Requested byte range not satisfiable. 10 - Byte range requested, but range support unavailable 11 - Illegal reget mode 12 - Socket timeout 13 - malformed proxy url 14 - HTTPError (includes .code and .exception attributes) 15 - user abort 16 - error writing to local file MirrorGroup error codes (256 -- 511) 256 - No more mirrors left to try Custom (non-builtin) classes derived from MirrorGroup (512 -- 767) [ this range reserved for application-specific error codes ] Retry codes (< 0) -1 - retry the download, unknown reason Note: to test which group a code is in, you can simply do integer division by 256: e.errno / 256 Negative codes are reserved for use by functions passed in to retrygrab with checkfunc. The value -1 is built in as a generic retry code and is already included in the retrycodes list. Therefore, you can create a custom check function that simply returns -1 and the fetch will be re-tried. For more customized retries, you can use other negative number and include them in retry-codes. This is nice for outputting useful messages about what failed. You can use these error codes like so: try: urlgrab(url) except URLGrabError, e: if e.errno == 3: ... # or print e.strerror # or simply print e #### print '[Errno %i] %s' % (e.errno, e.strerror) """ def __init__(self, *args): IOError.__init__(self, *args) self.url = "No url specified" class CallbackObject: """Container for returned callback data. This is currently a dummy class into which urlgrabber can stuff information for passing to callbacks. This way, the prototype for all callbacks is the same, regardless of the data that will be passed back. Any function that accepts a callback function as an argument SHOULD document what it will define in this object. It is possible that this class will have some greater functionality in the future. """ def __init__(self, **kwargs): self.__dict__.update(kwargs) def urlgrab(url, filename=None, **kwargs): """grab the file at <url> and make a local copy at <filename> If filename is none, the basename of the url is used. urlgrab returns the filename of the local file, which may be different from the passed-in filename if the copy_local kwarg == 0. See module documentation for a description of possible kwargs. """ return default_grabber.urlgrab(url, filename, **kwargs) def urlopen(url, **kwargs): """open the url and return a file object If a progress object or throttle specifications exist, then a special file object will be returned that supports them. The file object can be treated like any other file object. See module documentation for a description of possible kwargs. """ return default_grabber.urlopen(url, **kwargs) def urlread(url, limit=None, **kwargs): """read the url into a string, up to 'limit' bytes If the limit is exceeded, an exception will be thrown. Note that urlread is NOT intended to be used as a way of saying "I want the first N bytes" but rather 'read the whole file into memory, but don't use too much' See module documentation for a description of possible kwargs. """ return default_grabber.urlread(url, limit, **kwargs) class URLParser: """Process the URLs before passing them to urllib2. This class does several things: * add any prefix * translate a "raw" file to a proper file: url * handle any http or https auth that's encoded within the url * quote the url Only the "parse" method is called directly, and it calls sub-methods. An instance of this class is held in the options object, which means that it's easy to change the behavior by sub-classing and passing the replacement in. It need only have a method like: url, parts = urlparser.parse(url, opts) """ def parse(self, url, opts): """parse the url and return the (modified) url and its parts Note: a raw file WILL be quoted when it's converted to a URL. However, other urls (ones which come with a proper scheme) may or may not be quoted according to opts.quote opts.quote = 1 --> quote it opts.quote = 0 --> do not quote it opts.quote = None --> guess """ url = _to_utf8(url) quote = opts.quote if opts.prefix: url = self.add_prefix(url, opts.prefix) parts = urlparse.urlparse(url) (scheme, host, path, parm, query, frag) = parts if not scheme or (len(scheme) == 1 and scheme in string.letters): # if a scheme isn't specified, we guess that it's "file:" if url[0] not in '/\\': url = os.path.abspath(url) url = 'file:' + urllib.pathname2url(url) parts = urlparse.urlparse(url) quote = 0 # pathname2url quotes, so we won't do it again if scheme in ['http', 'https']: parts = self.process_http(parts, url) if quote is None: quote = self.guess_should_quote(parts) if quote: parts = self.quote(parts) url = urlparse.urlunparse(parts) return url, parts def add_prefix(self, url, prefix): if prefix[-1] == '/' or url[0] == '/': url = prefix + url else: url = prefix + '/' + url return url def process_http(self, parts, url): (scheme, host, path, parm, query, frag) = parts # TODO: auth-parsing here, maybe? pycurl doesn't really need it return (scheme, host, path, parm, query, frag) def quote(self, parts): """quote the URL This method quotes ONLY the path part. If you need to quote other parts, you should override this and pass in your derived class. The other alternative is to quote other parts before passing into urlgrabber. """ (scheme, host, path, parm, query, frag) = parts path = urllib.quote(path) return (scheme, host, path, parm, query, frag) hexvals = '0123456789ABCDEF' def guess_should_quote(self, parts): """ Guess whether we should quote a path. This amounts to guessing whether it's already quoted. find ' ' -> 1 find '%' -> 1 find '%XX' -> 0 else -> 1 """ (scheme, host, path, parm, query, frag) = parts if ' ' in path: return 1 ind = string.find(path, '%') if ind > -1: while ind > -1: if len(path) < ind+3: return 1 code = path[ind+1:ind+3].upper() if code[0] not in self.hexvals or \ code[1] not in self.hexvals: return 1 ind = string.find(path, '%', ind+1) return 0 return 1 class URLGrabberOptions: """Class to ease kwargs handling.""" def __init__(self, delegate=None, **kwargs): """Initialize URLGrabberOptions object. Set default values for all options and then update options specified in kwargs. """ self.delegate = delegate if delegate is None: self._set_defaults() self._set_attributes(**kwargs) def __getattr__(self, name): if self.delegate and hasattr(self.delegate, name): return getattr(self.delegate, name) raise AttributeError, name def raw_throttle(self): """Calculate raw throttle value from throttle and bandwidth values. """ if self.throttle <= 0: return 0 elif type(self.throttle) == type(0): return float(self.throttle) else: # throttle is a float return self.bandwidth * self.throttle def find_proxy(self, url, scheme): """Find the proxy to use for this URL. Use the proxies dictionary first, then libproxy. """ self.proxy = None if scheme not in ('ftp', 'http', 'https'): return if self.proxies: proxy = self.proxies.get(scheme) if proxy is None: if scheme == 'http': proxy = self.proxies.get('https') elif scheme == 'https': proxy = self.proxies.get('http') if proxy == '_none_': proxy = '' self.proxy = proxy return if self.libproxy: global _libproxy_cache if _libproxy_cache is None: try: import libproxy _libproxy_cache = libproxy.ProxyFactory() except: _libproxy_cache = False if _libproxy_cache: for proxy in _libproxy_cache.getProxies(url): if proxy.startswith('http://'): if DEBUG: DEBUG.info('using proxy "%s" for url %s' % (proxy, url)) self.proxy = proxy break def derive(self, **kwargs): """Create a derived URLGrabberOptions instance. This method creates a new instance and overrides the options specified in kwargs. """ return URLGrabberOptions(delegate=self, **kwargs) def _set_attributes(self, **kwargs): """Update object attributes with those provided in kwargs.""" self.__dict__.update(kwargs) if kwargs.has_key('range'): # normalize the supplied range value self.range = range_tuple_normalize(self.range) if not self.reget in [None, 'simple', 'check_timestamp']: raise URLGrabError(11, _('Illegal reget mode: %s') \ % (self.reget, )) def _set_defaults(self): """Set all options to their default values. When adding new options, make sure a default is provided here. """ self.progress_obj = None self.multi_progress_obj = None self.curl_obj = None self.throttle = 1.0 self.bandwidth = 0 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 self.user_agent = 'urlgrabber/%s' % __version__ self.ip_resolve = None self.keepalive = 1 self.proxies = None self.libproxy = False self.proxy = None self.reget = None self.failure_callback = None self.interrupt_callback = None self.prefix = None self.opener = None self.cache_openers = True self.timeout = 300 self.minrate = None self.text = None self.http_headers = None self.ftp_headers = None self.data = None self.urlparser = URLParser() self.quote = None self.username = None self.password = None self.ssl_ca_cert = None # sets SSL_CAINFO - path to certdb self.ssl_context = None # no-op in pycurl self.ssl_verify_peer = True # check peer's cert for authenticityb self.ssl_verify_host = True # make sure who they are and who the cert is for matches self.ssl_key = None # client key self.ssl_key_type = 'PEM' #(or DER) self.ssl_cert = None # client cert self.ssl_cert_type = 'PEM' # (or DER) self.ssl_key_pass = None # password to access the key 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 self.ftp_disable_epsv = False self.no_cache = False self.retry_no_cache = False def __repr__(self): return self.format() def format(self, indent=' '): keys = self.__dict__.keys() if self.delegate is not None: keys.remove('delegate') keys.sort() s = '{\n' for k in keys: s = s + indent + '%-15s: %s,\n' % \ (repr(k), repr(self.__dict__[k])) if self.delegate: df = self.delegate.format(indent + ' ') s = s + indent + '%-15s: %s\n' % ("'delegate'", df) 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. All options are specified as kwargs. Options may be specified when the class is created and may be overridden on a per request basis. New objects inherit default values from default_grabber. """ def __init__(self, **kwargs): self.opts = URLGrabberOptions(**kwargs) def _retry(self, opts, func, *args): tries = 0 while 1: # there are only two ways out of this loop. The second has # several "sub-ways" # 1) via the return in the "try" block # 2) by some exception being raised # a) an excepton is raised that we don't "except" # b) a callback raises ANY exception # c) we're not retry-ing or have run out of retries # d) the URLGrabError code is not in retrycodes # beware of infinite loops :) tries = tries + 1 exception = None callback = None if DEBUG: DEBUG.info('attempt %i/%s: %s', tries, opts.retry, args[0]) try: r = apply(func, (opts,) + args, {}) if DEBUG: DEBUG.info('success') return r except URLGrabError, e: exception = e callback = opts.failure_callback except KeyboardInterrupt, e: exception = e callback = opts.interrupt_callback if not callback: raise if DEBUG: DEBUG.info('exception: %s', exception) if callback: if DEBUG: DEBUG.info('calling callback: %s', callback) obj = CallbackObject(exception=exception, url=args[0], tries=tries, retry=opts.retry, retry_no_cache=opts.retry_no_cache) _run_callback(callback, obj) if (opts.retry is None) or (tries == opts.retry): if DEBUG: DEBUG.info('retries exceeded, re-raising') raise retrycode = getattr(exception, 'errno', None) if (retrycode is not None) and (retrycode not in opts.retrycodes): if DEBUG: DEBUG.info('retrycode (%i) not in list %s, re-raising', retrycode, opts.retrycodes) raise if retrycode is not None and retrycode < 0 and opts.retry_no_cache: opts.no_cache = True def urlopen(self, url, opts=None, **kwargs): """open the url and return a file object If a progress object or throttle value specified when this object was created, then a special file object will be returned that supports them. The file object can be treated like any other file object. """ url = _to_utf8(url) opts = (opts or self.opts).derive(**kwargs) if DEBUG: DEBUG.debug('combined options: %s' % repr(opts)) (url,parts) = opts.urlparser.parse(url, opts) opts.find_proxy(url, parts[0]) def retryfunc(opts, url): return PyCurlFileObject(url, filename=None, opts=opts) return self._retry(opts, retryfunc, url) def urlgrab(self, url, filename=None, opts=None, **kwargs): """grab the file at <url> and make a local copy at <filename> If filename is none, the basename of the url is used. urlgrab returns the filename of the local file, which may be different from the passed-in filename if copy_local == 0. """ url = _to_utf8(url) opts = (opts or self.opts).derive(**kwargs) if DEBUG: DEBUG.debug('combined options: %s' % repr(opts)) (url,parts) = opts.urlparser.parse(url, opts) (scheme, host, path, parm, query, frag) = parts opts.find_proxy(url, scheme) if filename is None: filename = os.path.basename( urllib.unquote(path) ) if not filename: # This is better than nothing. filename = 'index.html' if scheme == 'file' and not opts.copy_local: # just return the name of the local file - don't make a # copy currently path = urllib.url2pathname(path) if host: path = os.path.normpath('//' + host + path) if not os.path.exists(path): err = URLGrabError(2, _('Local file does not exist: %s') % (path, )) err.url = url raise err elif not os.path.isfile(path): err = URLGrabError(3, _('Not a normal file: %s') % (path, )) err.url = url raise err elif not opts.range: if not opts.checkfunc is None: 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): fo = PyCurlFileObject(url, filename, opts) try: fo._do_grab() if fo._tm_last: dlsz = fo._tm_last[0] - fo._tm_first[0] dltm = fo._tm_last[1] - fo._tm_first[1] _TH.update(url, dlsz, dltm, None) if not opts.checkfunc is None: obj = CallbackObject(filename=filename, url=url) _run_callback(opts.checkfunc, obj) finally: fo.close() return 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, opts=None, **kwargs): """read the url into a string, up to 'limit' bytes If the limit is exceeded, an exception will be thrown. Note that urlread is NOT intended to be used as a way of saying "I want the first N bytes" but rather 'read the whole file into memory, but don't use too much' """ url = _to_utf8(url) opts = (opts or self.opts).derive(**kwargs) if DEBUG: DEBUG.debug('combined options: %s' % repr(opts)) (url,parts) = opts.urlparser.parse(url, opts) opts.find_proxy(url, parts[0]) if limit is not None: limit = limit + 1 def retryfunc(opts, url, limit): fo = PyCurlFileObject(url, filename=None, opts=opts) s = '' try: # this is an unfortunate thing. Some file-like objects # have a default "limit" of None, while the built-in (real) # file objects have -1. They each break the other, so for # now, we just force the default if necessary. if limit is None: s = fo.read() else: s = fo.read(limit) if not opts.checkfunc is None: obj = CallbackObject(data=s, url=url) _run_callback(opts.checkfunc, obj) finally: fo.close() return s s = self._retry(opts, retryfunc, url, limit) if limit and len(s) > limit: err = URLGrabError(8, _('Exceeded limit (%i): %s') % (limit, url)) err.url = url raise err return s def _make_callback(self, callback_obj): # not used, left for compatibility if callable(callback_obj): return callback_obj, (), {} else: return callback_obj # create the default URLGrabber used by urlXXX functions. # NOTE: actual defaults are set in URLGrabberOptions default_grabber = URLGrabber() class PyCurlFileObject(object): def __init__(self, url, filename, opts): self.fo = None self._hdr_dump = '' self._parsed_hdr = None self.url = url self.scheme = urlparse.urlsplit(self.url)[0] self.filename = filename self.append = False self.reget_time = None self.opts = opts if self.opts.reget == 'check_timestamp': raise NotImplementedError, "check_timestamp regets are not implemented in this ver of urlgrabber. Please report this." self._complete = False self._rbuf = '' self._rbufsize = 1024*8 self._ttime = time.time() self._tsize = 0 self._amount_read = 0 self._reget_length = 0 self._prog_running = False self._error = (None, None) self.size = 0 self._hdr_ended = False self._tm_first = None self._tm_last = None self._do_open() def __getattr__(self, name): """This effectively allows us to wrap at the instance level. Any attribute not found in _this_ object will be searched for in self.fo. This includes methods.""" if hasattr(self.fo, name): return getattr(self.fo, name) raise AttributeError, name def _retrieve(self, buf): try: tm = self._amount_read + len(buf), time.time() if self._tm_first is None: self._tm_first = tm else: self._tm_last = tm if not self._prog_running: if self.opts.progress_obj: size = self.size + self._reget_length self.opts.progress_obj.start(self._prog_reportname, urllib.unquote(self.url), self._prog_basename, size=size, text=self.opts.text) self._prog_running = True self.opts.progress_obj.update(self._amount_read) self._amount_read += len(buf) try: self.fo.write(buf) except IOError, e: self._cb_error = URLGrabError(16, exception2msg(e)) return -1 return len(buf) except KeyboardInterrupt: return -1 def _hdr_retrieve(self, buf): if self._hdr_ended: self._hdr_dump = '' self.size = 0 self._hdr_ended = False if self._over_max_size(cur=len(self._hdr_dump), max_size=self.opts.max_header_size): return -1 try: # we have to get the size before we do the progress obj start # but we can't do that w/o making it do 2 connects, which sucks # so we cheat and stuff it in here in the hdr_retrieve if self.scheme in ['http','https']: if buf.lower().find('content-length:') != -1: length = buf.split(':')[1] self.size = int(length) elif self.append and self._hdr_dump == '' and ' 200 OK ' in buf: # reget was attempted but server sends it all # undo what we did in _build_range() self.append = False self.reget_time = None self._amount_read = 0 self._reget_length = 0 self.fo.truncate(0) elif self.scheme in ['ftp']: s = None if buf.startswith('213 '): s = buf[3:].strip() if len(s) >= 14: s = None # ignore MDTM responses elif buf.startswith('150 '): s = parse150(buf) if s: self.size = int(s) if buf.lower().find('location') != -1: location = ':'.join(buf.split(':')[1:]) location = location.strip() self.scheme = urlparse.urlsplit(location)[0] self.url = location self._hdr_dump += buf if len(self._hdr_dump) != 0 and buf == '\r\n': self._hdr_ended = True if DEBUG: DEBUG.debug('header ended:') return len(buf) except KeyboardInterrupt: return pycurl.READFUNC_ABORT def _return_hdr_obj(self): if self._parsed_hdr: return self._parsed_hdr statusend = self._hdr_dump.find('\n') statusend += 1 # ridiculous as it may seem. hdrfp = StringIO() hdrfp.write(self._hdr_dump[statusend:]) hdrfp.seek(0) self._parsed_hdr = mimetools.Message(hdrfp) return self._parsed_hdr hdr = property(_return_hdr_obj) http_code = property(fget= lambda self: self.curl_obj.getinfo(pycurl.RESPONSE_CODE)) def _set_opts(self, opts={}): # XXX if not opts: opts = self.opts # keepalives if not opts.keepalive: self.curl_obj.setopt(pycurl.FORBID_REUSE, 1) # defaults we're always going to set self.curl_obj.setopt(pycurl.NOPROGRESS, False) self.curl_obj.setopt(pycurl.NOSIGNAL, True) self.curl_obj.setopt(pycurl.WRITEFUNCTION, self._retrieve) self.curl_obj.setopt(pycurl.HEADERFUNCTION, self._hdr_retrieve) self.curl_obj.setopt(pycurl.PROGRESSFUNCTION, self._progress_update) self.curl_obj.setopt(pycurl.FAILONERROR, True) self.curl_obj.setopt(pycurl.OPT_FILETIME, True) self.curl_obj.setopt(pycurl.FOLLOWLOCATION, True) if DEBUG and DEBUG.level <= 10: self.curl_obj.setopt(pycurl.VERBOSE, True) if opts.user_agent: self.curl_obj.setopt(pycurl.USERAGENT, opts.user_agent) if opts.ip_resolve: # Default is: IPRESOLVE_WHATEVER ipr = opts.ip_resolve.lower() if ipr == 'whatever': # Do we need this? self.curl_obj.setopt(pycurl.IPRESOLVE,pycurl.IPRESOLVE_WHATEVER) if ipr == 'ipv4': self.curl_obj.setopt(pycurl.IPRESOLVE, pycurl.IPRESOLVE_V4) if ipr == 'ipv6': self.curl_obj.setopt(pycurl.IPRESOLVE, pycurl.IPRESOLVE_V6) # maybe to be options later self.curl_obj.setopt(pycurl.FOLLOWLOCATION, True) self.curl_obj.setopt(pycurl.MAXREDIRS, 5) # timeouts timeout = 300 if hasattr(opts, 'timeout'): timeout = int(opts.timeout or 0) self.curl_obj.setopt(pycurl.CONNECTTIMEOUT, timeout) self.curl_obj.setopt(pycurl.LOW_SPEED_LIMIT, opts.minrate or 1000) self.curl_obj.setopt(pycurl.LOW_SPEED_TIME, timeout) # ssl options if self.scheme == 'https': if opts.ssl_ca_cert: # this may do ZERO with nss according to curl docs self.curl_obj.setopt(pycurl.CAPATH, opts.ssl_ca_cert) self.curl_obj.setopt(pycurl.CAINFO, opts.ssl_ca_cert) self.curl_obj.setopt(pycurl.SSL_VERIFYPEER, opts.ssl_verify_peer) if opts.ssl_verify_host: # 1 is meaningless to curl self.curl_obj.setopt(pycurl.SSL_VERIFYHOST, 2) if opts.ssl_key: self.curl_obj.setopt(pycurl.SSLKEY, opts.ssl_key) if opts.ssl_key_type: self.curl_obj.setopt(pycurl.SSLKEYTYPE, opts.ssl_key_type) if opts.ssl_cert: self.curl_obj.setopt(pycurl.SSLCERT, opts.ssl_cert) # if we have a client side cert - turn off reuse b/c nss is odd self.curl_obj.setopt(pycurl.FORBID_REUSE, 1) if opts.ssl_cert_type: self.curl_obj.setopt(pycurl.SSLCERTTYPE, opts.ssl_cert_type) if opts.ssl_key_pass: self.curl_obj.setopt(pycurl.SSLKEYPASSWD, opts.ssl_key_pass) #headers: if self.scheme in ('http', 'https'): headers = [] if opts.http_headers is not None: for (tag, content) in opts.http_headers: headers.append('%s:%s' % (tag, content)) if opts.no_cache: headers.append('Pragma:no-cache') if headers: self.curl_obj.setopt(pycurl.HTTPHEADER, headers) # ranges: if opts.range or opts.reget: range_str = self._build_range() if range_str: self.curl_obj.setopt(pycurl.RANGE, range_str) # throttle/bandwidth if hasattr(opts, 'raw_throttle') and opts.raw_throttle(): self.curl_obj.setopt(pycurl.MAX_RECV_SPEED_LARGE, int(opts.raw_throttle())) # proxy if opts.proxy is not None: self.curl_obj.setopt(pycurl.PROXY, opts.proxy) self.curl_obj.setopt(pycurl.PROXYAUTH, # All but Kerberos. BZ 769254 pycurl.HTTPAUTH_ANY - pycurl.HTTPAUTH_GSSNEGOTIATE) if opts.username and opts.password: if self.scheme in ('http', 'https'): self.curl_obj.setopt(pycurl.HTTPAUTH, pycurl.HTTPAUTH_ANY) if opts.username and opts.password: # apparently when applying them as curlopts they do not require quoting of any kind userpwd = '%s:%s' % (opts.username, opts.password) self.curl_obj.setopt(pycurl.USERPWD, userpwd) #posts - simple - expects the fields as they are if opts.data: self.curl_obj.setopt(pycurl.POST, True) self.curl_obj.setopt(pycurl.POSTFIELDS, _to_utf8(opts.data)) # ftp if opts.ftp_disable_epsv: self.curl_obj.setopt(pycurl.FTP_USE_EPSV, False) # our url self.curl_obj.setopt(pycurl.URL, self.url) def _do_perform(self): if self._complete: return try: self.curl_obj.perform() 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 # this covers e.args[0] == 22 pretty well - which will be common code = self.http_code errcode = e.args[0] errurl = urllib.unquote(self.url) if self._error[0]: errcode = self._error[0] if errcode == 23 and 200 <= code <= 299: # this is probably wrong but ultimately this is what happens # we have a legit http code and a pycurl 'writer failed' code # which almost always means something aborted it from outside # since we cannot know what it is -I'm banking on it being # a ctrl-c. XXXX - if there's a way of going back two raises to # figure out what aborted the pycurl process FIXME raise getattr(self, '_cb_error', KeyboardInterrupt) elif errcode == 28: err = URLGrabError(12, _('Timeout on %s: %s') % (errurl, e)) err.url = errurl raise err elif errcode == 42: # this is probably wrong but ultimately this is what happens # we have a legit http code and a pycurl 'writer failed' code # which almost always means something aborted it from outside # since we cannot know what it is -I'm banking on it being # a ctrl-c. XXXX - if there's a way of going back two raises to # figure out what aborted the pycurl process FIXME raise KeyboardInterrupt else: pyerr2str = { 5 : _("Couldn't resolve proxy"), 6 : _("Couldn't resolve host"), 7 : _("Couldn't connect"), 8 : _("Bad reply to FTP server"), 9 : _("Access denied"), 11 : _("Bad reply to FTP pass"), 13 : _("Bad reply to FTP pasv"), 14 : _("Bad reply to FTP 227"), 15 : _("Couldn't get FTP host"), 17 : _("Couldn't set FTP type"), 18 : _("Partial file"), 19 : _("FTP RETR command failed"), 22 : _("HTTP returned error"), 23 : _("Write error"), 25 : _("Upload failed"), 26 : _("Read error"), 27 : _("Out of Memory"), 28 : _("Operation timed out"), 30 : _("FTP PORT command failed"), 31 : _("FTP REST command failed"), 33 : _("Range failed"), 34 : _("HTTP POST failed"), 35 : _("SSL CONNECT failed"), 36 : _("Couldn't resume download"), 37 : _("Couldn't read file"), 42 : _("Aborted by callback"), 47 : _("Too many redirects"), 51 : _("Peer certificate failed verification"), 52 : _("Got nothing: SSL certificate expired?"), 53 : _("SSL engine not found"), 54 : _("SSL engine set failed"), 55 : _("Network error send()"), 56 : _("Network error recv()"), 58 : _("Local certificate failed"), 59 : _("SSL set cipher failed"), 60 : _("Local CA certificate failed"), 61 : _("HTTP bad transfer encoding"), 63 : _("Maximum file size exceeded"), 64 : _("FTP SSL failed"), 67 : _("Authentication failure"), 70 : _("Out of disk space on server"), 73 : _("Remove file exists"), 77 : _("Problem with the SSL CA cert (path? access rights?)"), } errstr = str(e.args[1]) or pyerr2str.get(errcode, '<Unknown>') if code and not 200 <= code <= 299: msg = '%s Error %d - %s' % (self.scheme.upper(), code, self.scheme in ('http', 'https') and responses.get(code) or errstr) else: msg = 'curl#%s - "%s"' % (errcode, errstr) code = errcode err = URLGrabError(14, msg) err.url = errurl err.code = code raise err else: if self._error[1]: msg = self._error[1] err = URLGrabError(14, msg) err.url = urllib.unquote(self.url) raise err def _do_open(self): if hasattr(self.opts, 'curl_obj') and self.opts.curl_obj is not None: self.curl_obj = self.opts.curl_obj else: self.curl_obj = _curl_cache self.curl_obj.reset() # reset all old settings away, just in case # setup any ranges self._set_opts() self._do_grab() return self.fo def _add_headers(self): pass def _build_range(self): reget_length = 0 rt = None if self.opts.reget and type(self.filename) in types.StringTypes: # we have reget turned on and we're dumping to a file try: s = os.stat(self.filename) except OSError: pass else: self.reget_time = s[stat.ST_MTIME] reget_length = s[stat.ST_SIZE] # Set initial length when regetting self._amount_read = reget_length self._reget_length = reget_length # set where we started from, too rt = reget_length, '' self.append = 1 if self.opts.range: rt = self.opts.range if rt[0] is None: rt = (0, rt[1]) rt = (rt[0] + reget_length, rt[1]) if rt: header = range_tuple_to_header(rt) if header: return header.split('=')[1] def _make_request(self, req, opener): #XXXX # This doesn't do anything really, but we could use this # instead of do_open() to catch a lot of crap errors as # mstenner did before here return (self.fo, self.hdr) try: if self.opts.timeout: old_to = socket.getdefaulttimeout() socket.setdefaulttimeout(self.opts.timeout) try: fo = opener.open(req) finally: socket.setdefaulttimeout(old_to) else: fo = opener.open(req) hdr = fo.info() except ValueError, e: err = URLGrabError(1, _('Bad URL: %s : %s') % (self.url, e, )) err.url = self.url raise err except RangeError, e: err = URLGrabError(9, _('%s on %s') % (e, self.url)) err.url = self.url raise err except urllib2.HTTPError, e: new_e = URLGrabError(14, _('%s on %s') % (e, self.url)) new_e.code = e.code new_e.exception = e new_e.url = self.url raise new_e except IOError, e: if hasattr(e, 'reason') and isinstance(e.reason, socket.timeout): err = URLGrabError(12, _('Timeout on %s: %s') % (self.url, e)) err.url = self.url raise err else: err = URLGrabError(4, _('IOError on %s: %s') % (self.url, e)) err.url = self.url raise err except OSError, e: err = URLGrabError(5, _('%s on %s') % (e, self.url)) err.url = self.url raise err except HTTPException, e: err = URLGrabError(7, _('HTTP Exception (%s) on %s: %s') % \ (e.__class__.__name__, self.url, e)) err.url = self.url raise err else: return (fo, hdr) def _do_grab(self): """dump the file to a filename or StringIO buffer""" if self._complete: return _was_filename = False if type(self.filename) in types.StringTypes and self.filename: _was_filename = True 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' self.fo = StringIO() # if this is to be a tempfile instead.... # it just makes crap in the tempdir #fh, self._temp_name = mkstemp() #self.fo = open(self._temp_name, 'wb') try: self._do_perform() except URLGrabError, e: self.fo.flush() self.fo.close() raise e if _was_filename: # 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') except IOError, e: err = URLGrabError(16, _(\ 'error opening file from %s, IOError: %s') % (self.url, e)) err.url = self.url raise err else: #self.fo = open(self._temp_name, 'r') self.fo.seek(0) self._complete = True 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 read until it gets nothing more. It updates the progress meter and throttles after every self._rbufsize bytes.""" # the _rbuf test is only in this first 'if' for speed. It's not # logically necessary if self._rbuf and not amt is None: L = len(self._rbuf) if amt > L: amt = amt - L else: return # if we've made it here, then we don't have enough in the buffer # and we need to read more. if not self._complete: self._do_grab() #XXX cheater - change on ranges buf = [self._rbuf] bufsize = len(self._rbuf) while amt is None or amt: # first, delay if necessary for throttling reasons if self.opts.raw_throttle(): diff = self._tsize/self.opts.raw_throttle() - \ (time.time() - self._ttime) if diff > 0: time.sleep(diff) self._ttime = time.time() # now read some data, up to self._rbufsize if amt is None: readamount = self._rbufsize else: readamount = min(amt, self._rbufsize) try: new = self.fo.read(readamount) except socket.error, e: err = URLGrabError(4, _('Socket Error on %s: %s') % (self.url, e)) err.url = self.url raise err except socket.timeout, e: raise URLGrabError(12, _('Timeout on %s: %s') % (self.url, e)) err.url = self.url raise err except IOError, e: raise URLGrabError(4, _('IOError on %s: %s') %(self.url, e)) err.url = self.url raise err newsize = len(new) if not newsize: break # no more to read if amt: amt = amt - newsize buf.append(new) bufsize = bufsize + newsize self._tsize = newsize self._amount_read = self._amount_read + newsize #if self.opts.progress_obj: # self.opts.progress_obj.update(self._amount_read) self._rbuf = string.join(buf, '') return def _progress_update(self, download_total, downloaded, upload_total, uploaded): if self._over_max_size(cur=self._amount_read-self._reget_length): return -1 try: if self._prog_running: downloaded += self._reget_length self.opts.progress_obj.update(downloaded) except (KeyboardInterrupt, IOError): return -1 def _over_max_size(self, cur, max_size=None): if not max_size: if not self.opts.size: max_size = self.size else: max_size = self.opts.size if not max_size: return False # if we have None for all of the Max then this is dumb if cur > int(float(max_size) * 1.10): msg = _("Downloaded more than max size for %s: %s > %s") \ % (self.url, cur, max_size) self._error = (pycurl.E_FILESIZE_EXCEEDED, msg) return True return False def read(self, amt=None): self._fill_buffer(amt) if amt is None: s, self._rbuf = self._rbuf, '' else: s, self._rbuf = self._rbuf[:amt], self._rbuf[amt:] return s def readline(self, limit=-1): if not self._complete: self._do_grab() return self.fo.readline() i = string.find(self._rbuf, '\n') while i < 0 and not (0 < limit <= len(self._rbuf)): L = len(self._rbuf) self._fill_buffer(L + self._rbufsize) if not len(self._rbuf) > L: break i = string.find(self._rbuf, '\n', L) if i < 0: i = len(self._rbuf) else: i = i+1 if 0 <= limit < len(self._rbuf): i = limit s, self._rbuf = self._rbuf[:i], self._rbuf[i:] return s def close(self): if self._prog_running: self.opts.progress_obj.end(self._amount_read) self.fo.close() def geturl(self): """ Provide the geturl() method, used to be got from urllib.addinfourl, via. urllib.URLopener.* """ return self.url if hasattr(pycurl, 'GLOBAL_ACK_EINTR'): # fail immediately on ctrl-c pycurl.global_init(pycurl.GLOBAL_DEFAULT | pycurl.GLOBAL_ACK_EINTR) _curl_cache = pycurl.Curl() # make one and reuse it over and over and over def reset_curl_obj(): """To make sure curl has reread the network/dns info we force a reload""" global _curl_cache _curl_cache.close() _curl_cache = pycurl.Curl() _libproxy_cache = None ##################################################################### # DEPRECATED FUNCTIONS def set_throttle(new_throttle): """Deprecated. Use: default_grabber.throttle = new_throttle""" default_grabber.throttle = new_throttle def set_bandwidth(new_bandwidth): """Deprecated. Use: default_grabber.bandwidth = new_bandwidth""" default_grabber.bandwidth = new_bandwidth def set_progress_obj(new_progress_obj): """Deprecated. Use: default_grabber.progress_obj = new_progress_obj""" default_grabber.progress_obj = new_progress_obj def set_user_agent(new_user_agent): """Deprecated. Use: default_grabber.user_agent = new_user_agent""" default_grabber.user_agent = new_user_agent def retrygrab(url, filename=None, copy_local=0, close_connection=0, progress_obj=None, throttle=None, bandwidth=None, numtries=3, retrycodes=[-1,2,4,5,6,7], checkfunc=None): """Deprecated. Use: urlgrab() with the retry arg instead""" kwargs = {'copy_local' : copy_local, 'close_connection' : close_connection, 'progress_obj' : progress_obj, 'throttle' : throttle, 'bandwidth' : bandwidth, 'retry' : numtries, 'retrycodes' : retrycodes, 'checkfunc' : checkfunc } return urlgrab(url, filename, **kwargs) ##################################################################### # 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', 'minrate', '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', 'ftp_disable_epsv', 'no_cache', ) 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 and opts.multi_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(' ', 6) _id, size = map(int, line[:2]) if len(line) == 2: self.running[_id]._progress.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[6]) if line[5] != '0': ug_err.code = int(line[5]) if DEBUG: DEBUG.info('failure: %s', ug_err) _TH.update(opts.url, int(line[2]), float(line[3]), ug_err, opts.async[0]) 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(): if event & select.EPOLLHUP: if DEBUG: DEBUG.info('downloader died') raise KeyboardInterrupt 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=None): '''Process queued requests in parallel. ''' # calculate total sizes meters = {} for opts in _async_queue: if opts.progress_obj and opts.multi_progress_obj: count, total = meters.get(opts.multi_progress_obj) or (0, 0) meters[opts.multi_progress_obj] = count + 1, total + opts.size # start multi-file meters for meter in meters: count, total = meters[meter] meter.start(count, total) dl = _ExternalDownloaderPool() host_con = {} # current host connection counts single = set() # hosts in single connection mode def start(opts, tries): opts.tries = tries try: dl.start(opts) except OSError, e: # can't spawn downloader, give up immediately opts.exception = URLGrabError(5, exception2msg(e)) _run_callback(opts.failfunc, opts) return key, limit = opts.async host_con[key] = host_con.get(key, 0) + 1 if opts.progress_obj: if opts.multi_progress_obj: opts._progress = opts.multi_progress_obj.newMeter() opts._progress.start(text=opts.text) else: opts._progress = time.time() # no updates def perform(): for opts, size, ug_err in dl.perform(): key, limit = opts.async host_con[key] -= 1 if ug_err is None: if opts.checkfunc: try: _run_callback(opts.checkfunc, opts) except URLGrabError, ug_err: pass if opts.progress_obj: if opts.multi_progress_obj: if ug_err: opts._progress.failure(None) else: opts.multi_progress_obj.re.total += size - opts.size # correct totals opts._progress.end(size) opts.multi_progress_obj.removeMeter(opts._progress) else: opts.progress_obj.start(text=opts.text, now=opts._progress) opts.progress_obj.update(size) opts.progress_obj.end(size) del opts._progress if ug_err is None: continue if limit != 1 and key not in single and ug_err.errno in (12, 14): # One possible cause is connection-limited server. # Turn on the max_connections=1 override. BZ 853432 if DEBUG: DEBUG.info('max_connections(%s) %s => 1', key, limit) single.add(key) # When using multi-downloader the parent's _curl_cache # object is idle. Kill it, as it might use keepalive=1. reset_curl_obj() 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.errno in opts.retrycodes: if ug_err.errno < 0 and opts.retry_no_cache: opts.no_cache = True start(opts, opts.tries + 1) # simple retry continue if opts.mirror_group: mg, errors, failed, removed = opts.mirror_group errors.append((opts.url, exception2msg(ug_err))) failed[key] = failed.get(key, 0) + 1 opts.mirror = key opts.exception = ug_err action = mg.default_action or {} if mg.failure_callback: opts.tries = len(errors) action = dict(action) # update only the copy action.update(_run_callback(mg.failure_callback, opts)) if not action.get('fail', 0): # mask this mirror and retry if action.get('remove', 1): removed.add(key) _async_queue.append(opts) continue # fail=1 from callback ug_err.errors = errors # 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) >= default_grabber.opts.max_connections: perform() if DEBUG: DEBUG.info('max_connections: %d/%d', len(dl.running), default_grabber.opts.max_connections) if opts.mirror_group: mg, errors, failed, removed = opts.mirror_group # find the best mirror best = None best_speed = None for mirror in mg.mirrors: key = mirror['mirror'] if key in removed: continue # estimate mirror speed speed, fail = _TH.estimate(key) speed /= 1 + host_con.get(key, 0) # order by: least failures, private flag, best speed # ignore 'private' flag if there were failures private = not fail and mirror.get('kwargs', {}).get('private', False) speed = -failed.get(key, 0), private, speed 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.')) opts.exception.errors = errors _run_callback(opts.failfunc, opts) continue # update the grabber object, apply mirror kwargs grabber = best.get('grabber') or mg.grabber opts.delegate = grabber.opts.derive(**best.get('kwargs', {})) # update the current mirror and limit key = best['mirror'] limit = best.get('kwargs', {}).get('max_connections') 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 if key in single: limit = 1 while host_con.get(key, 0) >= (limit or 2): perform() if DEBUG: DEBUG.info('max_connections(%s): %d/%s', key, host_con.get(key, 0), limit) start(opts, 1) except IOError, e: if e.errno != 4: raise raise KeyboardInterrupt finally: dl.abort() for meter in meters: 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: now = int(time.time()) for line in open(filename): try: host, speed, fail, ts = line.rsplit(' ', 3) _TH.hosts[host] = int(speed), int(fail), min(int(ts), now) except ValueError: if DEBUG: DEBUG.info('Error parsing timedhosts: line "%s"', line) 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, baseurl=None): # Use hostname from URL. If it's a file:// URL, use baseurl. # If no baseurl, do not update timedhosts. host = urlparse.urlsplit(url).netloc.split('@')[-1] or baseurl if not host: return _TH.load() speed, fail, ts = _TH.hosts.get(host) or (0, 0, 0) now = time.time() if ug_err is None: # defer first update if the file was small. BZ 851178. if not ts and dl_size < 1e6: return # k1: the older, the less useful # k2: <500ms readings are less reliable # speeds vary, use 10:1 smoothing k1 = 2**((ts - now) / default_grabber.opts.half_life) k2 = min(dl_time / .500, 1.0) / 10 if k2 > 0: 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(baseurl): _TH.load() # Use just the hostname, unless it's a file:// baseurl. host = urlparse.urlsplit(baseurl).netloc.split('@')[-1] or baseurl default_speed = default_grabber.opts.default_speed try: speed, fail, ts = _TH.hosts[host] except KeyError: return default_speed, 0 speed *= 2**-fail k = 2**((ts - time.time()) / default_grabber.opts.half_life) speed = k * speed + (1 - k) * default_speed return speed, fail ##################################################################### # TESTING def _main_test(): try: url, filename = sys.argv[1:3] except ValueError: print 'usage:', sys.argv[0], \ '<url> <filename> [copy_local=0|1] [close_connection=0|1]' sys.exit() kwargs = {} for a in sys.argv[3:]: k, v = string.split(a, '=', 1) kwargs[k] = int(v) set_throttle(1.0) set_bandwidth(32 * 1024) print "throttle: %s, throttle bandwidth: %s B/s" % (default_grabber.throttle, default_grabber.bandwidth) try: from progress import text_progress_meter except ImportError, e: pass else: kwargs['progress_obj'] = text_progress_meter() try: name = apply(urlgrab, (url, filename), kwargs) except URLGrabError, e: print e else: print 'LOCAL FILE:', name def _retry_test(): try: url, filename = sys.argv[1:3] except ValueError: print 'usage:', sys.argv[0], \ '<url> <filename> [copy_local=0|1] [close_connection=0|1]' sys.exit() kwargs = {} for a in sys.argv[3:]: k, v = string.split(a, '=', 1) kwargs[k] = int(v) try: from progress import text_progress_meter except ImportError, e: pass else: kwargs['progress_obj'] = text_progress_meter() def cfunc(filename, hello, there='foo'): print hello, there import random rnum = random.random() if rnum < .5: print 'forcing retry' raise URLGrabError(-1, 'forcing retry') if rnum < .75: print 'forcing failure' raise URLGrabError(-2, 'forcing immediate failure') print 'success' return kwargs['checkfunc'] = (cfunc, ('hello',), {'there':'there'}) try: name = apply(retrygrab, (url, filename), kwargs) except URLGrabError, e: print e else: print 'LOCAL FILE:', name def _file_object_test(filename=None): import cStringIO if filename is None: filename = __file__ print 'using file "%s" for comparisons' % filename fo = open(filename) s_input = fo.read() fo.close() for testfunc in [_test_file_object_smallread, _test_file_object_readall, _test_file_object_readline, _test_file_object_readlines]: fo_input = cStringIO.StringIO(s_input) fo_output = cStringIO.StringIO() wrapper = PyCurlFileObject(fo_input, None, 0) print 'testing %-30s ' % testfunc.__name__, testfunc(wrapper, fo_output) s_output = fo_output.getvalue() if s_output == s_input: print 'passed' else: print 'FAILED' def _test_file_object_smallread(wrapper, fo_output): while 1: s = wrapper.read(23) fo_output.write(s) if not s: return def _test_file_object_readall(wrapper, fo_output): s = wrapper.read() fo_output.write(s) def _test_file_object_readline(wrapper, fo_output): while 1: s = wrapper.readline() fo_output.write(s) if not s: return def _test_file_object_readlines(wrapper, fo_output): li = wrapper.readlines() fo_output.write(string.join(li, '')) if __name__ == '__main__': _main_test() _retry_test() _file_object_test('test')
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