mirror of https://github.com/ARMmbed/mbed-os.git
				
				
				
			
		
			
				
	
	
		
			486 lines
		
	
	
		
			18 KiB
		
	
	
	
		
			Python
		
	
	
			
		
		
	
	
			486 lines
		
	
	
		
			18 KiB
		
	
	
	
		
			Python
		
	
	
try:
 | 
						|
    from urllib2 import urlopen, URLError
 | 
						|
except ImportError:
 | 
						|
    from urllib.request import urlopen, URLError
 | 
						|
from bs4 import BeautifulSoup
 | 
						|
from os.path import join, dirname, basename
 | 
						|
from os import makedirs
 | 
						|
from errno import EEXIST
 | 
						|
from threading import Thread
 | 
						|
try:
 | 
						|
    from Queue import Queue
 | 
						|
except ImportError:
 | 
						|
    from queue import Queue
 | 
						|
from re import compile, sub
 | 
						|
from sys import stderr, stdout
 | 
						|
from itertools import takewhile
 | 
						|
import argparse
 | 
						|
from json import dump, load
 | 
						|
from zipfile import ZipFile
 | 
						|
from tempfile import gettempdir
 | 
						|
import warnings
 | 
						|
from distutils.version import LooseVersion
 | 
						|
 | 
						|
from tools.flash_algo import PackFlashAlgo
 | 
						|
 | 
						|
warnings.filterwarnings("ignore")
 | 
						|
 | 
						|
from fuzzywuzzy import process
 | 
						|
 | 
						|
RootPackURL = "http://www.keil.com/pack/index.idx"
 | 
						|
 | 
						|
LocalPackDir = dirname(__file__)
 | 
						|
LocalPackIndex = join(LocalPackDir, "index.json")
 | 
						|
LocalPackAliases = join(LocalPackDir, "aliases.json")
 | 
						|
 | 
						|
 | 
						|
protocol_matcher = compile("\w*://")
 | 
						|
def strip_protocol(url) :
 | 
						|
    return protocol_matcher.sub("", str(url))
 | 
						|
 | 
						|
def largest_version(content) :
 | 
						|
    return sorted([t['version'] for t in content.package.releases('release')],
 | 
						|
                  reverse=True, key=lambda v: LooseVersion(v))[0]
 | 
						|
 | 
						|
def do_queue(Class, function, interable) :
 | 
						|
    q = Queue()
 | 
						|
    threads = [Class(q, function) for each in range(20)]
 | 
						|
    for each in threads :
 | 
						|
        each.setDaemon(True)
 | 
						|
        each.start()
 | 
						|
    for thing in interable :
 | 
						|
        q.put(thing)
 | 
						|
    q.join()
 | 
						|
 | 
						|
class Reader (Thread) :
 | 
						|
    def __init__(self, queue, func) :
 | 
						|
        Thread.__init__(self)
 | 
						|
        self.queue = queue
 | 
						|
        self.func = func
 | 
						|
    def run(self) :
 | 
						|
        while True :
 | 
						|
            url = self.queue.get()
 | 
						|
            self.func(url)
 | 
						|
            self.queue.task_done()
 | 
						|
 | 
						|
 | 
						|
class Cache () :
 | 
						|
    """ The Cache object is the only relevant API object at the moment
 | 
						|
 | 
						|
    Constructing the Cache object does not imply any caching.
 | 
						|
    A user of the API must explicitly call caching functions.
 | 
						|
 | 
						|
    :param silent: A boolean that, when True, significantly reduces the printing of this Object
 | 
						|
    :type silent: bool
 | 
						|
    :param no_timeouts: A boolean that, when True, disables the default connection timeout and low speed timeout for downloading things.
 | 
						|
    :type no_timeouts: bool
 | 
						|
    """
 | 
						|
    def __init__ (self, silent, no_timeouts) :
 | 
						|
        self.silent = silent
 | 
						|
        self.counter = 0
 | 
						|
        self.total = 1
 | 
						|
        self._index = {}
 | 
						|
        self._aliases = {}
 | 
						|
        self.urls = None
 | 
						|
        self.no_timeouts = no_timeouts
 | 
						|
        self.data_path = gettempdir()
 | 
						|
 | 
						|
    def display_counter (self, message) :
 | 
						|
        stdout.write("{} {}/{}\r".format(message, self.counter, self.total))
 | 
						|
        stdout.flush()
 | 
						|
 | 
						|
    def cache_file (self, url) :
 | 
						|
        """Low level interface to caching a single file.
 | 
						|
 | 
						|
        :param url: The URL to cache.
 | 
						|
        :type url: str
 | 
						|
        :rtype: None
 | 
						|
        """
 | 
						|
        if not self.silent : print("Caching {}...".format(url))
 | 
						|
        dest = join(self.data_path, strip_protocol(url))
 | 
						|
        try :
 | 
						|
            makedirs(dirname(dest))
 | 
						|
        except OSError as exc :
 | 
						|
            if exc.errno == EEXIST : pass
 | 
						|
            else : raise
 | 
						|
        try:
 | 
						|
            with open(dest, "wb+") as fd :
 | 
						|
                fd.write(urlopen(url).read())
 | 
						|
        except URLError as e:
 | 
						|
            stderr.write(e.reason)
 | 
						|
        self.counter += 1
 | 
						|
        self.display_counter("Caching Files")
 | 
						|
 | 
						|
    def pdsc_to_pack (self, url) :
 | 
						|
        """Find the URL of the specified pack file described by a PDSC.
 | 
						|
 | 
						|
        The PDSC is assumed to be cached and is looked up in the cache by its URL.
 | 
						|
 | 
						|
        :param url: The url used to look up the PDSC.
 | 
						|
        :type url: str
 | 
						|
        :return: The url of the PACK file.
 | 
						|
        :rtype: str
 | 
						|
        """
 | 
						|
        content = self.pdsc_from_cache(url)
 | 
						|
        new_url = content.package.url.get_text()
 | 
						|
        if not new_url.endswith("/") :
 | 
						|
            new_url = new_url + "/"
 | 
						|
        return (new_url + content.package.vendor.get_text() + "." +
 | 
						|
                content.package.find('name').get_text() + "." +
 | 
						|
                largest_version(content) + ".pack")
 | 
						|
 | 
						|
    def cache_pdsc_and_pack (self, url) :
 | 
						|
        self.cache_file(url)
 | 
						|
        try :
 | 
						|
            self.cache_file(self.pdsc_to_pack(url))
 | 
						|
        except AttributeError :
 | 
						|
            stderr.write("[ ERROR ] {} does not appear to be a conforming .pdsc file\n".format(url))
 | 
						|
            self.counter += 1
 | 
						|
 | 
						|
    def get_urls(self):
 | 
						|
        """Extract the URLs of all know PDSC files.
 | 
						|
 | 
						|
        Will pull the index from the internet if it is not cached.
 | 
						|
 | 
						|
        :return: A list of all PDSC URLs
 | 
						|
        :rtype: [str]
 | 
						|
        """
 | 
						|
        if not self.urls :
 | 
						|
            try : root_data = self.pdsc_from_cache(RootPackURL)
 | 
						|
            except IOError : root_data = self.cache_and_parse(RootPackURL)
 | 
						|
            self.urls = ["/".join([pdsc.get('url').strip("/"),
 | 
						|
                                   pdsc.get('name').strip("/")])
 | 
						|
                         for pdsc in root_data.find_all("pdsc")]
 | 
						|
        return self.urls
 | 
						|
 | 
						|
    def _get_sectors(self, device):
 | 
						|
        """Extract sector sizes from device FLM algorithm
 | 
						|
 | 
						|
        Will return None if there is no algorithm, pdsc URL formatted in correctly
 | 
						|
 | 
						|
        :return: A list tuples of sector start and size
 | 
						|
        :rtype: [list]
 | 
						|
        """
 | 
						|
        try:
 | 
						|
            pack = self.pack_from_cache(device)
 | 
						|
            ret = []
 | 
						|
            for filename in device['algorithm'].keys():
 | 
						|
                try:
 | 
						|
                    flm = pack.open(filename)
 | 
						|
                    flash_alg = PackFlashAlgo(flm.read())
 | 
						|
                    sectors = [(flash_alg.flash_start + offset, size)
 | 
						|
                               for offset, size in flash_alg.sector_sizes]
 | 
						|
                    ret.extend(sectors)
 | 
						|
                except Exception:
 | 
						|
                    pass
 | 
						|
            ret.sort(key=lambda sector: sector[0])
 | 
						|
            return ret
 | 
						|
        except Exception:
 | 
						|
            return None
 | 
						|
 | 
						|
    def _extract_dict(self, device, filename, pack) :
 | 
						|
        to_ret = dict(pdsc_file=filename, pack_file=pack)
 | 
						|
        try : to_ret["memory"] = dict([(m["id"], dict(start=m["start"],
 | 
						|
                                                      size=m["size"]))
 | 
						|
                                       for m in device("memory")])
 | 
						|
        except (KeyError, TypeError, IndexError) as e:
 | 
						|
            try : to_ret["memory"] = dict([(m["name"], dict(start=m["start"],
 | 
						|
                                                          size=m["size"]))
 | 
						|
                                           for m in device("memory")])
 | 
						|
            except (KeyError, TypeError, IndexError) as e : pass
 | 
						|
        try: algorithms = device("algorithm")
 | 
						|
        except:
 | 
						|
            try: algorithms = device.parent("algorithm")
 | 
						|
            except: pass
 | 
						|
        else:
 | 
						|
            if not algorithms:
 | 
						|
                try: algorithms = device.parent("algorithm")
 | 
						|
                except: pass
 | 
						|
        try : to_ret["algorithm"] = dict([(algo.get("name").replace('\\','/'),
 | 
						|
                                           dict(start=algo["start"],
 | 
						|
                                                size=algo["size"],
 | 
						|
                                                ramstart=algo.get("ramstart",None),
 | 
						|
                                                ramsize=algo.get("ramsize",None),
 | 
						|
                                                default=algo.get("default",1)))
 | 
						|
                                       for algo in algorithms])
 | 
						|
        except (KeyError, TypeError, IndexError) as e: pass
 | 
						|
        try: to_ret["debug"] = device.parent.parent.debug["svd"]
 | 
						|
        except (KeyError, TypeError, IndexError) as e : pass
 | 
						|
        try: to_ret["debug"] = device.parent.debug["svd"]
 | 
						|
        except (KeyError, TypeError, IndexError) as e : pass
 | 
						|
        try: to_ret["debug"] = device.debug["svd"]
 | 
						|
        except (KeyError, TypeError, IndexError) as e : pass
 | 
						|
 | 
						|
        to_ret["compile"] = {}
 | 
						|
        try: compile_l1 = device.parent("compile")
 | 
						|
        except (KeyError, TypeError, IndexError) as e : compile_l1 = []
 | 
						|
        try: compile_l2 = device.parent.parent("compile")
 | 
						|
        except (KeyError, TypeError, IndexError) as e : compile_l2 = []
 | 
						|
        compile = compile_l2 + compile_l1
 | 
						|
        for c in compile:
 | 
						|
            try: to_ret["compile"]["header"] = c["header"]
 | 
						|
            except (KeyError, TypeError, IndexError) as e : pass
 | 
						|
            try: to_ret["compile"]["define"] =  c["define"]
 | 
						|
            except (KeyError, TypeError, IndexError) as e : pass
 | 
						|
 | 
						|
        try: to_ret["core"] = device.parent.processor['dcore']
 | 
						|
        except (KeyError, TypeError, IndexError) as e : pass
 | 
						|
        try: to_ret["core"] = device.parent.parent.processor['dcore']
 | 
						|
        except (KeyError, TypeError, IndexError) as e : pass
 | 
						|
 | 
						|
        to_ret["processor"] = {}
 | 
						|
        try: proc_l1 = device("processor")
 | 
						|
        except (KeyError, TypeError, IndexError) as e: proc_l1 = []
 | 
						|
        try: proc_l2 = device.parent("processor")
 | 
						|
        except (KeyError, TypeError, IndexError) as e: proc_l2 = []
 | 
						|
        try: proc_l3 = device.parent.parent("processor")
 | 
						|
        except (KeyError, TypeError, IndexError) as e: proc_l3 = []
 | 
						|
        proc = proc_l3 + proc_l2 + proc_l1
 | 
						|
        for p in proc:
 | 
						|
            try: to_ret["processor"]["fpu"] = p['dfpu']
 | 
						|
            except (KeyError, TypeError, IndexError) as e: pass
 | 
						|
            try: to_ret["processor"]["endianness"] = p['dendian']
 | 
						|
            except (KeyError, TypeError, IndexError) as e: pass
 | 
						|
            try: to_ret["processor"]["clock"] = p['dclock']
 | 
						|
            except (KeyError, TypeError, IndexError) as e: pass
 | 
						|
 | 
						|
        try: to_ret["vendor"] = device.parent['dvendor']
 | 
						|
        except (KeyError, TypeError, IndexError) as e: pass
 | 
						|
        try: to_ret["vendor"] = device.parent.parent['dvendor']
 | 
						|
        except (KeyError, TypeError, IndexError) as e: pass
 | 
						|
 | 
						|
        if not to_ret["processor"]:
 | 
						|
            del to_ret["processor"]
 | 
						|
 | 
						|
        if not to_ret["compile"]:
 | 
						|
            del to_ret["compile"]
 | 
						|
 | 
						|
        to_ret['debug-interface'] = []
 | 
						|
        to_ret['sectors'] = self._get_sectors(to_ret)
 | 
						|
 | 
						|
        return to_ret
 | 
						|
 | 
						|
    def _generate_index_helper(self, d) :
 | 
						|
        try :
 | 
						|
            pack = self.pdsc_to_pack(d)
 | 
						|
            self._index.update(dict([(dev['dname'], self._extract_dict(dev, d, pack)) for dev in
 | 
						|
                                    (self.pdsc_from_cache(d)("device"))]))
 | 
						|
        except AttributeError as e :
 | 
						|
            stderr.write("[ ERROR ] file {}\n".format(d))
 | 
						|
            print(e)
 | 
						|
        self.counter += 1
 | 
						|
        self.display_counter("Generating Index")
 | 
						|
 | 
						|
    def _generate_aliases_helper(self, d) :
 | 
						|
        try :
 | 
						|
            mydict = []
 | 
						|
            for dev in self.pdsc_from_cache(d)("board"):
 | 
						|
                try :
 | 
						|
                    mydict.append((dev['name'], dev.mounteddevice['dname']))
 | 
						|
                except (KeyError, TypeError, IndexError) as e:
 | 
						|
                    pass
 | 
						|
            self._aliases.update(dict(mydict))
 | 
						|
        except (AttributeError, TypeError) as e :
 | 
						|
            pass
 | 
						|
        self.counter += 1
 | 
						|
        self.display_counter("Scanning for Aliases")
 | 
						|
 | 
						|
    def get_flash_algorthim_binary(self, device_name, all=False) :
 | 
						|
        """Retrieve the flash algorithm file for a particular part.
 | 
						|
 | 
						|
        Assumes that both the PDSC and the PACK file associated with that part are in the cache.
 | 
						|
 | 
						|
        :param device_name: The exact name of a device
 | 
						|
        :param all: Return an iterator of all flash algos for this device
 | 
						|
        :type device_name: str
 | 
						|
        :return: A file-like object that, when read, is the ELF file that describes the flashing algorithm
 | 
						|
        :return: A file-like object that, when read, is the ELF file that describes the flashing algorithm.
 | 
						|
                 When "all" is set to True then an iterator for file-like objects is returned
 | 
						|
        :rtype: ZipExtFile or ZipExtFile iterator if all is True
 | 
						|
        """
 | 
						|
        device = self.index[device_name]
 | 
						|
        pack = self.pack_from_cache(device)
 | 
						|
        algo_itr = (pack.open(path) for path in device['algorithm'].keys())
 | 
						|
        return algo_itr if all else algo_itr.next()
 | 
						|
 | 
						|
    def get_svd_file(self, device_name) :
 | 
						|
        """Retrieve the flash algorithm file for a particular part.
 | 
						|
 | 
						|
        Assumes that both the PDSC and the PACK file associated with that part are in the cache.
 | 
						|
 | 
						|
        :param device_name: The exact name of a device
 | 
						|
        :type device_name: str
 | 
						|
        :return: A file-like object that, when read, is the ELF file that describes the flashing algorithm
 | 
						|
        :rtype: ZipExtFile
 | 
						|
        """
 | 
						|
        device = self.index[device_name]
 | 
						|
        pack = self.pack_from_cache(device)
 | 
						|
        return pack.open(device['debug'])
 | 
						|
 | 
						|
    def generate_index(self) :
 | 
						|
        self._index = {}
 | 
						|
        self.counter = 0
 | 
						|
        do_queue(Reader, self._generate_index_helper, self.get_urls())
 | 
						|
        with open(LocalPackIndex, "wb+") as out:
 | 
						|
            self._index["version"] = "0.1.0"
 | 
						|
            dump(self._index, out)
 | 
						|
        stdout.write("\n")
 | 
						|
 | 
						|
    def generate_aliases(self) :
 | 
						|
        self._aliases = {}
 | 
						|
        self.counter = 0
 | 
						|
        do_queue(Reader, self._generate_aliases_helper, self.get_urls())
 | 
						|
        with open(LocalPackAliases, "wb+") as out:
 | 
						|
            dump(self._aliases, out)
 | 
						|
        stdout.write("\n")
 | 
						|
 | 
						|
    def find_device(self, match) :
 | 
						|
        choices = process.extract(match, self.index.keys(), limit=len(self.index))
 | 
						|
        choices = sorted([(v, k) for k, v in choices], reverse=True)
 | 
						|
        if choices : choices = list(takewhile(lambda t: t[0] == choices[0][0], choices))
 | 
						|
        return [(v, self.index[v]) for k,v in choices]
 | 
						|
 | 
						|
    def dump_index_to_file(self, file) :
 | 
						|
        with open(file, "wb+") as out:
 | 
						|
            dump(self.index, out)
 | 
						|
 | 
						|
    @property
 | 
						|
    def index(self) :
 | 
						|
        """An index of most of the important data in all cached PDSC files.
 | 
						|
 | 
						|
        :Example:
 | 
						|
 | 
						|
        >>> from ArmPackManager import Cache
 | 
						|
        >>> a = Cache()
 | 
						|
        >>> a.index["LPC1768"]
 | 
						|
        {u'algorithm': {u'RAMsize': u'0x0FE0',
 | 
						|
                u'RAMstart': u'0x10000000',
 | 
						|
                u'name': u'Flash/LPC_IAP_512.FLM',
 | 
						|
                u'size': u'0x80000',
 | 
						|
                u'start': u'0x00000000'},
 | 
						|
         u'compile': [u'Device/Include/LPC17xx.h', u'LPC175x_6x'],
 | 
						|
         u'debug': u'SVD/LPC176x5x.svd',
 | 
						|
         u'pdsc_file': u'http://www.keil.com/pack/Keil.LPC1700_DFP.pdsc',
 | 
						|
         u'memory': {u'IRAM1': {u'size': u'0x8000', u'start': u'0x10000000'},
 | 
						|
                     u'IRAM2': {u'size': u'0x8000', u'start': u'0x2007C000'},
 | 
						|
                     u'IROM1': {u'size': u'0x80000', u'start': u'0x00000000'}}}
 | 
						|
 | 
						|
 | 
						|
        """
 | 
						|
        if not self._index :
 | 
						|
            with open(LocalPackIndex) as i :
 | 
						|
                self._index = load(i)
 | 
						|
        return self._index
 | 
						|
    @property
 | 
						|
    def aliases(self) :
 | 
						|
        """An index of most of the important data in all cached PDSC files.
 | 
						|
 | 
						|
        :Example:
 | 
						|
 | 
						|
        >>> from ArmPackManager import Cache
 | 
						|
        >>> a = Cache()
 | 
						|
        >>> a.index["LPC1768"]
 | 
						|
        {u'algorithm': {u'RAMsize': u'0x0FE0',
 | 
						|
                u'RAMstart': u'0x10000000',
 | 
						|
                u'name': u'Flash/LPC_IAP_512.FLM',
 | 
						|
                u'size': u'0x80000',
 | 
						|
                u'start': u'0x00000000'},
 | 
						|
         u'compile': [u'Device/Include/LPC17xx.h', u'LPC175x_6x'],
 | 
						|
         u'debug': u'SVD/LPC176x5x.svd',
 | 
						|
         u'pdsc_file': u'http://www.keil.com/pack/Keil.LPC1700_DFP.pdsc',
 | 
						|
         u'memory': {u'IRAM1': {u'size': u'0x8000', u'start': u'0x10000000'},
 | 
						|
                     u'IRAM2': {u'size': u'0x8000', u'start': u'0x2007C000'},
 | 
						|
                     u'IROM1': {u'size': u'0x80000', u'start': u'0x00000000'}}}
 | 
						|
 | 
						|
 | 
						|
        """
 | 
						|
        if not self._aliases :
 | 
						|
            with open(LocalPackAliases) as i :
 | 
						|
                self._aliases = load(i)
 | 
						|
        return self._aliases
 | 
						|
 | 
						|
    def cache_everything(self) :
 | 
						|
        """Cache every PACK and PDSC file known.
 | 
						|
 | 
						|
        Generates an index afterwards.
 | 
						|
 | 
						|
        .. note:: This process may use 4GB of drive space and take upwards of 10 minutes to complete.
 | 
						|
        """
 | 
						|
        self.cache_pack_list(self.get_urls())
 | 
						|
        self.generate_index()
 | 
						|
        self.generate_aliases()
 | 
						|
 | 
						|
    def cache_descriptors(self) :
 | 
						|
        """Cache every PDSC file known.
 | 
						|
 | 
						|
        Generates an index afterwards.
 | 
						|
 | 
						|
        .. note:: This process may use 11MB of drive space and take upwards of 1 minute.
 | 
						|
        """
 | 
						|
        self.cache_descriptor_list(self.get_urls())
 | 
						|
        self.generate_index()
 | 
						|
        self.generate_aliases()
 | 
						|
 | 
						|
    def cache_descriptor_list(self, list) :
 | 
						|
        """Cache a list of PDSC files.
 | 
						|
 | 
						|
        :param list: URLs of PDSC files to cache.
 | 
						|
        :type list: [str]
 | 
						|
        """
 | 
						|
        self.total = len(list)
 | 
						|
        self.display_counter("Caching Files")
 | 
						|
        do_queue(Reader, self.cache_file, list)
 | 
						|
        stdout.write("\n")
 | 
						|
 | 
						|
    def cache_pack_list(self, list) :
 | 
						|
        """Cache a list of PACK files, referenced by their PDSC URL
 | 
						|
 | 
						|
        :param list: URLs of PDSC files to cache.
 | 
						|
        :type list: [str]
 | 
						|
        """
 | 
						|
        self.total = len(list) * 2
 | 
						|
        self.display_counter("Caching Files")
 | 
						|
        do_queue(Reader, self.cache_pdsc_and_pack, list)
 | 
						|
        stdout.write("\n")
 | 
						|
 | 
						|
    def pdsc_from_cache(self, url) :
 | 
						|
        """Low level inteface for extracting a PDSC file from the cache.
 | 
						|
 | 
						|
        Assumes that the file specified is a PDSC file and is in the cache.
 | 
						|
 | 
						|
        :param url: The URL of a PDSC file.
 | 
						|
        :type url: str
 | 
						|
        :return: A parsed representation of the PDSC file.
 | 
						|
        :rtype: BeautifulSoup
 | 
						|
        """
 | 
						|
        dest = join(self.data_path, strip_protocol(url))
 | 
						|
        with open(dest, "r") as fd :
 | 
						|
            return BeautifulSoup(fd, "html.parser")
 | 
						|
 | 
						|
    def pack_from_cache(self, device) :
 | 
						|
        """Low level inteface for extracting a PACK file from the cache.
 | 
						|
 | 
						|
        Assumes that the file specified is a PACK file and is in the cache.
 | 
						|
 | 
						|
        :param url: The URL of a PACK file.
 | 
						|
        :type url: str
 | 
						|
        :return: A parsed representation of the PACK file.
 | 
						|
        :rtype: ZipFile
 | 
						|
        """
 | 
						|
        return ZipFile(join(self.data_path,
 | 
						|
                            strip_protocol(device['pack_file'])))
 | 
						|
 | 
						|
    def gen_dict_from_cache() :
 | 
						|
        pdsc_files = pdsc_from_cache(RootPackUrl)
 | 
						|
 | 
						|
    def cache_and_parse(self, url) :
 | 
						|
        """A low level shortcut that Caches and Parses a PDSC file.
 | 
						|
 | 
						|
        :param url: The URL of the PDSC file.
 | 
						|
        :type url: str
 | 
						|
        :return: A parsed representation of the PDSC file.
 | 
						|
        :rtype: BeautifulSoup
 | 
						|
        """
 | 
						|
        self.cache_file(url)
 | 
						|
        return self.pdsc_from_cache(url)
 |