sdk/cwl/arvados_cwl/http.py

   1 # Copyright (C) The Arvados Authors. All rights reserved.
   2 #
   3 # SPDX-License-Identifier: Apache-2.0
   4
   5 from __future__ import division
   6 from future import standard_library
   7 standard_library.install_aliases()
   8
   9 import requests
  10 import email.utils
  11 import time
  12 import datetime
  13 import re
  14 import arvados
  15 import arvados.collection
  16 import urllib.parse
  17 import logging
  18 import calendar
  19 import urllib.parse
  20
  21 logger = logging.getLogger('arvados.cwl-runner')
  22
  23 def my_formatdate(dt):
  24     return email.utils.formatdate(timeval=calendar.timegm(dt.timetuple()),
  25                                   localtime=False, usegmt=True)
  26
  27 def my_parsedate(text):
  28     parsed = email.utils.parsedate_tz(text)
  29     if parsed:
  30         if parsed[9]:
  31             # Adjust to UTC
  32             return datetime.datetime(*parsed[:6]) + datetime.timedelta(seconds=parsed[9])
  33         else:
  34             # TZ is zero or missing, assume UTC.
  35             return datetime.datetime(*parsed[:6])
  36     else:
  37         return datetime.datetime(1970, 1, 1)
  38
  39 def fresh_cache(url, properties, now):
  40     pr = properties[url]
  41     expires = None
  42
  43     logger.debug("Checking cache freshness for %s using %s", url, pr)
  44
  45     if "Cache-Control" in pr:
  46         if re.match(r"immutable", pr["Cache-Control"]):
  47             return True
  48
  49         g = re.match(r"(s-maxage|max-age)=(\d+)", pr["Cache-Control"])
  50         if g:
  51             expires = my_parsedate(pr["Date"]) + datetime.timedelta(seconds=int(g.group(2)))
  52
  53     if expires is None and "Expires" in pr:
  54         expires = my_parsedate(pr["Expires"])
  55
  56     if expires is None:
  57         # Use a default cache time of 24 hours if upstream didn't set
  58         # any cache headers, to reduce redundant downloads.
  59         expires = my_parsedate(pr["Date"]) + datetime.timedelta(hours=24)
  60
  61     if not expires:
  62         return False
  63
  64     return (now < expires)
  65
  66 def remember_headers(url, properties, headers, now):
  67     properties.setdefault(url, {})
  68     for h in ("Cache-Control", "ETag", "Expires", "Date", "Content-Length"):
  69         if h in headers:
  70             properties[url][h] = headers[h]
  71     if "Date" not in headers:
  72         properties[url]["Date"] = my_formatdate(now)
  73
  74
  75 def changed(url, properties, now):
  76     req = requests.head(url, allow_redirects=True)
  77     remember_headers(url, properties, req.headers, now)
  78
  79     if req.status_code != 200:
  80         raise Exception("Got status %s" % req.status_code)
  81
  82     pr = properties[url]
  83     if "ETag" in pr and "ETag" in req.headers:
  84         if pr["ETag"] == req.headers["ETag"]:
  85             return False
  86
  87     return True
  88
  89 def http_to_keep(api, project_uuid, url, utcnow=datetime.datetime.utcnow):
  90     r = api.collections().list(filters=[["properties", "exists", url]]).execute()
  91
  92     now = utcnow()
  93
  94     for item in r["items"]:
  95         properties = item["properties"]
  96         if fresh_cache(url, properties, now):
  97             # Do nothing
  98             cr = arvados.collection.CollectionReader(item["portable_data_hash"], api_client=api)
  99             return "keep:%s/%s" % (item["portable_data_hash"], list(cr.keys())[0])
 100
 101         if not changed(url, properties, now):
 102             # ETag didn't change, same content, just update headers
 103             api.collections().update(uuid=item["uuid"], body={"collection":{"properties": properties}}).execute()
 104             cr = arvados.collection.CollectionReader(item["portable_data_hash"], api_client=api)
 105             return "keep:%s/%s" % (item["portable_data_hash"], list(cr.keys())[0])
 106
 107     properties = {}
 108     req = requests.get(url, stream=True, allow_redirects=True)
 109
 110     if req.status_code != 200:
 111         raise Exception("Failed to download '%s' got status %s " % (url, req.status_code))
 112
 113     remember_headers(url, properties, req.headers, now)
 114
 115     if "Content-Length" in properties[url]:
 116         cl = int(properties[url]["Content-Length"])
 117         logger.info("Downloading %s (%s bytes)", url, cl)
 118     else:
 119         cl = None
 120         logger.info("Downloading %s (unknown size)", url)
 121
 122     c = arvados.collection.Collection()
 123
 124     if req.headers.get("Content-Disposition"):
 125         grp = re.search(r'filename=("((\"|[^"])+)"|([^][()<>@,;:\"/?={} ]+))', req.headers["Content-Disposition"])
 126         if grp.group(2):
 127             name = grp.group(2)
 128         else:
 129             name = grp.group(4)
 130     else:
 131         name = urllib.parse.urlparse(url).path.split("/")[-1]
 132
 133     count = 0
 134     start = time.time()
 135     checkpoint = start
 136     with c.open(name, "wb") as f:
 137         for chunk in req.iter_content(chunk_size=1024):
 138             count += len(chunk)
 139             f.write(chunk)
 140             loopnow = time.time()
 141             if (loopnow - checkpoint) > 20:
 142                 bps = count / (loopnow - start)
 143                 if cl is not None:
 144                     logger.info("%2.1f%% complete, %3.2f MiB/s, %1.0f seconds left",
 145                                 ((count * 100) / cl),
 146                                 (bps // (1024*1024)),
 147                                 ((cl-count) // bps))
 148                 else:
 149                     logger.info("%d downloaded, %3.2f MiB/s", count, (bps / (1024*1024)))
 150                 checkpoint = loopnow
 151
 152
 153     collectionname = "Downloaded from %s" % urllib.parse.quote(url, safe='')
 154     c.save_new(name=collectionname, owner_uuid=project_uuid, ensure_unique_name=True)
 155
 156     api.collections().update(uuid=c.manifest_locator(), body={"collection":{"properties": properties}}).execute()
 157
 158     return "keep:%s/%s" % (c.portable_data_hash(), name)