Scripts to download files from google storage based on sha1 sums

build/upload_to_google_storage.py

Index: build/upload_to_google_storage.py
diff --git a/build/upload_to_google_storage.py b/build/upload_to_google_storage.py
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+++ b/build/upload_to_google_storage.py
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+#!/usr/bin/env python
+# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Script to upload files to Google Storage."""
+
+import hashlib
+import optparse
+import os
+import Queue
+import re
+import subprocess
+import sys
+import tempfile
+import threading
+import time
+import zipfile
+
+# TODO(hinoka): This is currently incorrect. Should find a better default.
+GSUTIL_DEFAULT_PATH = os.path.join(os.path.dirname(os.path.normpath(__file__)),
+    '..', '..', 'third_party', 'gsutil', 'gsutil')
+
+USAGE_STRING = """%prog [options] target [target2 ...].
+Target is the file intended to be uploaded to Google Storage.
+If target is "-", then a list of files will be taken from standard input
+
+This script will generate a file (original filename).sha1 containing the
+sha1 sum of the uploaded file.
+It is recommended that the .sha1 file is checked into the repository,
+the original file removed from the repository, and a hook added to the
+DEPS file to call download_from_google_storage.py.
+
+Example usages
+--------------
+
+Scan the current directory and upload all files larger than 1MB:
+find . -name .svn -prune -o -size +1000k -type f -print0 | %prog -0 -
+"""
+
+
+class Gsutil():

[M-A Ruel, 2013/01/17 19:53:17]

Can you share code?

+  def __init__(self, path, boto_path=None, timeout=None):
+    if not os.path.exists(path):
+      raise OSError('GSUtil not found in %s' % path)
+    self.path = path
+
+    self.timeout = timeout
+    self.boto_path = boto_path
+
+  def call(self, *args):
+    def _thread_main():
+      thr = threading.current_thread()
+      env = os.environ.copy()
+      if self.boto_path is not None:
+        env['AWS_CREDENTIAL_FILE'] = self.boto_path
+      thr.status = subprocess.call((sys.executable, self.path) + args, env=env)
+    thr = threading.Thread(target=_thread_main)
+    thr.start()
+    thr.join(self.timeout)
+    if thr.isAlive():
+      raise RuntimeError('%s %s timed out after %d seconds.' % (
+              self.path, ' '.join(args), self.timeout))
+    return thr.status
+
+  def check_call(self, *args):
+    def _thread_main():
+      thr = threading.current_thread()
+      env = os.environ.copy()
+      if self.boto_path is not None:
+        env['AWS_CREDENTIAL_FILE'] = self.boto_path
+      p = subprocess.Popen((sys.executable, self.path) + args,
+                           stdout=subprocess.PIPE,
+                           stderr=subprocess.PIPE,
+                           env=env)
+      code = p.wait()
+      out, err = p.communicate()
+      thr.status = (code, out, err)
+
+    thr = threading.Thread(target=_thread_main)
+    thr.start()
+    thr.join(self.timeout)
+    if thr.isAlive():
+      raise RuntimeError('%s %s timed out after %d seconds.' % (
+              self.path, ' '.join(args), self.timeout))
+    code, out, err = thr.status
+    status_code_match = re.search('status=([0-9]+)', err)
+    if status_code_match:
+      return int(status_code_match.groups(1))
+    elif ('You are attempting to access protected data with '
+          'no configured credentials.' in err):
+      return (403, out, err)
+    elif 'No such object' in err:
+      return (404, out, err)
+    else:
+      return (code, out, err)
+
+  def clone(self):
+    return Gsutil(self.path, self.boto_path, self.timeout)
+
+
+def GetSHA1(filename):
+  sha1 = hashlib.sha1()
+  with open(filename, 'rb') as f:
+    while True:
+      # Read in 1mb chunks, so it doesn't all have to be loaded into memory.
+      chunk = f.read(1024*1024)
+      if not chunk:
+        break
+      sha1.update(chunk)
+  return sha1.hexdigest()
+
+
+def CheckSHA1(sha1_sum, filename):
+  return sha1_sum == GetSHA1(filename)
+
+
+def GetMD5(filename, lock, use_md5):
+  # See if we can find an existing MD5 sum stored in a file.
+  if use_md5 and os.path.exists('%s.md5' % filename):
+    with open('%s.md5' % filename) as f:
+      md5_match = re.search('([a-z0-9]{32})', f.read())
+      if md5_match:
+        return md5_match.groups()[0]
+
+  # Calculate the MD5 checksum of the file.
+  md5_calculator = hashlib.md5()
+  with lock:
+    with open(filename, 'rb') as f:
+      while True:
+        chunk = f.read(1024*1024)
+        if not chunk:
+          break
+        md5_calculator.update(chunk)
+  local_md5 = md5_calculator.hexdigest()
+  if use_md5:
+    with open('%s.md5' % filename, 'w') as f:
+      f.write(local_md5)
+  return local_md5
+
+
+def _upload_worker(thread_num, q, base_url, gsutil, options, md5_lock):
+  while True:
+    try:
+      filename, sha1_sum = q.get_nowait()
+      file_url = '%s/%s' % (base_url, sha1_sum)
+      if gsutil.check_call('ls', file_url)[0] == 0 and not options.force:
+        # File exists, check MD5 hash.
+        _, out, _ = gsutil.check_call('ls', '-L', file_url)
+        etag_match = re.search('ETag:\s+([a-z0-9]{32})', out)
+        if etag_match:
+          remote_md5 = etag_match.groups()[0]
+          # Calculate the MD5 checksum to match it to Google Storage's ETag.
+          local_md5 = GetMD5(filename, md5_lock, options.use_md5)
+          if local_md5 == remote_md5:
+            print ('File %s already exists at %s and MD5 matches, exiting' %
+                   (filename, file_url))
+            continue
+      print 'Uploading %s to %s' % (filename, file_url)
+      code = gsutil.call('cp', '-q', filename, file_url)
+      if code != 0:
+        print >>sys.stderr, gsutil.stderr
+        continue
+    except Queue.Empty:
+      return
+
+def main(args):
+  parser = optparse.OptionParser(USAGE_STRING)
+  parser.add_option('-b', '--bucket', default='chrome-artifacts',
+                    help='Google Storage bucket to upload to.')
+  parser.add_option('-e', '--boto', default=None,
+                    help='Specify a custom boto file.')
+  parser.add_option('-f', '--force', action='store_true', default=False,
+                    help='Force upload even if remote file exists.')
+  parser.add_option('-g', '--gsutil_path', default=GSUTIL_DEFAULT_PATH,
+                    help='Path to the gsutil script.')
+  parser.add_option('-m', '--use_md5', action='store_true', default=False,
+                    help='Generate MD5 files when scanning, and don\'t check '
+                    'the MD5 checksum if a .md5 file is found.')
+  parser.add_option('-t', '--num_threads', default=1, type='int',
+                    help='Number of uploader threads to run.')
+  parser.add_option('-s', '--skip_hashing', action='store_true', default=False,
+                    help='Skip hashing if .sha1 file exists.')
+  parser.add_option('-0', '--use_null_terminator', action='store_true',
+                    default=False, help='Use \\0 instead of \\n when parsing '
+                    'the file list from stdin.  This is useful if the input '
+                    'is coming from "find ... -print0".')
+  (options, args) = parser.parse_args()
+
+  if len(args) < 1:
+    parser.error('Missing target.')
+  elif len(args) == 1 and args[0] == '-':
+    # Take stdin as a newline or null seperated list of files.
+    if options.use_null_terminator:
+      input_filenames = [line for line in sys.stdin.read().split('\0')]
+    else:
+      input_filenames = [line.strip() for line in sys.stdin.readlines()]
+  else:
+    input_filenames = args
+  base_url = 'gs://%s' % options.bucket
+
+  # Make sure we can find a working instance of gsutil.
+  if os.path.exists(options.gsutil_path):
+    gsutil = Gsutil(options.gsutil_path)
+  else:
+    for path in os.environ["PATH"].split(os.pathsep):
+      if os.path.exists(path) and 'gsutil' in os.listdir(path):
+        gsutil = Gsutil(os.path.join(path, 'gsutil'))
+
+  # Check if we have permissions to the Google Storage bucket.
+  code, ls_out, ls_err = gsutil.check_call('ls', base_url)
+  if code == 403:
+    code, _, _ = gsutil.call('config')
+    if code != 0:
+      print >>sys.stderr, 'Error while authenticating to %s, exiting' % base_url
+      return 403
+  elif code == 404:
+    print >>sys.stderr, '%s not found.' % base_url
+    return 404
+  elif code != 0:
+    print >>sys.stderr, ls_err
+    return code
+
+  # We want to hash everything in a single thread since its faster.
+  # The bottleneck is in disk IO, not CPU.
+  upload_queue = Queue.Queue()
+  hash_timer = time.time()
+  for filename in input_filenames:
+    if not os.path.exists(filename):
+      print 'Error: %s not found, skipping.' % filename
+      continue
+    if os.path.exists('%s.sha1' % filename) and options.skip_hashing:
+      print 'Found hash for %s, skipping.' % filename
+      upload_queue.put((filename, open('%s.sha1' % filename).read()))
+      continue
+    print 'Calculating hash for %s...' % filename,
+    sha1_sum = GetSHA1(filename)
+    with open(filename + '.sha1', 'w') as f:
+      f.write(sha1_sum)
+    print 'done'
+    upload_queue.put((filename, sha1_sum))
+  hash_time = time.time() - hash_timer
+
+  # Start up all the worker threads.
+  all_threads = []
+
+  # We only want one MD5 calculation happening at a time.
+  md5_lock = threading.Lock()
+  upload_timer = time.time()
+
+  for thread_num in range(options.num_threads):
+    t = threading.Thread(target=_upload_worker, args=[thread_num,
+        upload_queue, base_url, gsutil.clone(), options, md5_lock])
+    t.daemon = True
+    t.start()
+    all_threads.append(t)
+
+  # Wait for everything to finish.
+  for t in all_threads:
+    t.join()
+
+  print 'Success.'
+  print 'Hashing %s files took %1f seconds' % (len(input_filenames), hash_time)
+  print 'Uploading took %1f seconds' % (time.time() - upload_timer)
+  return 0
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))