Support network cache in Download.download().

src/zc/buildout/buildout.py

@@ -164,6 +164,8 @@ _buildout_default_options = _annotate_section({
     'use-dependency-links': 'true',
     }, 'DEFAULT_VALUE')
 
+network_cache_parameter_dict = {}
+
 class Buildout(DictMixin):
 
     def __init__(self, config_file, cloptions,
@@ -421,6 +423,31 @@ class Buildout(DictMixin):
 
         os.chdir(options['directory'])
 
+        networkcache_section_name = options.get('networkcache-section')
+        if networkcache_section_name:
+            networkcache_section = self[networkcache_section_name]
+            for k in (
+                'download-cache-url',
+                'download-dir-url',
+                'upload-cache-url',
+                'upload-dir-url',
+                'signature-certificate-list',
+                'signature-private-key-file',
+                'shacache-ca-file',
+                'shacache-cert-file',
+                'shacache-key-file',
+                'shadir-ca-file',
+                'shadir-cert-file',
+                'shadir-key-file',
+            ):
+                network_cache_parameter_dict[k] = networkcache_section.get(k, '')
+                # parse signature list
+                cert_marker = '-----BEGIN CERTIFICATE-----'
+            network_cache_parameter_dict['signature-certificate-list'] = \
+                [cert_marker + '\n' + q.strip() \
+                    for q in network_cache_parameter_dict['signature-certificate-list'].split(cert_marker) \
+                    if q.strip()]
+
     def _buildout_path(self, name):
         if '${' in name:
             return name

src/zc/buildout/download.py

@@ -204,10 +204,29 @@ class Download(object):
         handle, tmp_path = tempfile.mkstemp(prefix='buildout-')
         os.close(handle)
         try:
-            tmp_path, headers = urlretrieve(url, tmp_path)
-            if not check_md5sum(tmp_path, md5sum):
-                raise ChecksumError(
-                    'MD5 checksum mismatch downloading %r' % url)
+            from .buildout import network_cache_parameter_dict as nc
+            if not download_network_cached(
+                nc.get('download-dir-url'),
+                nc.get('download-cache-url'),
+                tmp_path, url, self.logger,
+                nc.get('signature-certificate-list'), md5sum):
+                # Download from original url if not cached or md5sum doesn't match.
+                tmp_path, headers = urlretrieve(url, tmp_path)
+                if not check_md5sum(tmp_path, md5sum):
+                    raise ChecksumError(
+                        'MD5 checksum mismatch downloading %r' % url)
+                # Upload the file to network cache.
+                if nc.get('upload-cache-url') and nc.get('upload-dir-url'):
+                    upload_network_cached(
+                        nc.get('upload-dir-url'),
+                        nc.get('upload-cache-url'), url, tmp_path, self.logger,
+                        nc.get('signature-private-key-file'),
+                        nc.get('shacache-ca-file'),
+                        nc.get('shacache-cert-file'),
+                        nc.get('shacache-key-file'),
+                        nc.get('shadir-ca-file'),
+                        nc.get('shadir-cert-file'),
+                        nc.get('shadir-key-file'))
         except IOError:
             e = sys.exc_info()[1]
             os.remove(tmp_path)
@@ -276,6 +295,8 @@ def remove(path):
     if os.path.exists(path):
         os.remove(path)
 
+from zc.buildout.networkcache import download_network_cached, \
+                                     upload_network_cached
 
 def locate_at(source, dest):
     if dest is None or realpath(dest) == realpath(source):

src/zc/buildout/networkcache.py

+##############################################################################
+#
+# Copyright (c) 2010 ViFiB SARL and Contributors.
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+
+#XXX factor with slapos/grid/networkcache.py and use libnetworkcache helpers
+
+from __future__ import absolute_import, print_function, division
+import hashlib
+import posixpath
+import re
+import traceback
+try:
+    # Python 3
+    from urllib.error import HTTPError
+    from urllib.parse import urlparse
+    strify = bytes.decode
+except ImportError:
+    # Python 2
+    from urllib2 import HTTPError
+    from urlparse import urlparse
+    strify = str
+
+try:
+    try:
+        from slapos.libnetworkcache import NetworkcacheClient, UploadError, \
+           DirectoryNotFound
+        from slapos.networkcachehelper import \
+           helper_download_network_cached, \
+           helper_download_network_cached_to_file
+    except ImportError:
+        LIBNETWORKCACHE_ENABLED = False
+    else:
+        LIBNETWORKCACHE_ENABLED = True
+except:
+    print('There was problem while trying to import slapos.libnetworkcache:\n'
+          + traceback.format_exc())
+    LIBNETWORKCACHE_ENABLED = False
+    print('Networkcache forced to be disabled.')
+
+_md5_re = re.compile(r'md5=([a-f0-9]+)')
+
+
+def _get_md5_from_url(url):
+  match = _md5_re.search(url)
+  if match:
+    return match.group(1)
+
+def fallback_call(function):
+    """Decorator which disallow to have any problem while calling method"""
+    def wrapper(self, *args, **kwd):
+        """
+        Log the call, and the result of the call
+        """
+        try:
+            return function(self, *args, **kwd)
+        except: # indeed, *any* exception is swallowed
+            print('There was problem while calling method %r:\n%s' % (
+                function.__name__, traceback.format_exc()))
+            return False
+    wrapper.__doc__ = function.__doc__
+    return wrapper
+
+
+@fallback_call
+def get_directory_key(url):
+    """Returns directory hash based on url.
+
+    Basically check if the url belongs to pypi:
+      - if yes, the directory key will be pypi-buildout-urlmd5
+      - if not, the directory key will be slapos-buildout-urlmd5
+    # XXX why is that?
+    """
+    urlmd5 = hashlib.md5(url.encode()).hexdigest()
+    if 'pypi' in url:
+      return 'pypi-buildout-%s' % urlmd5
+    return 'slapos-buildout-%s' % urlmd5
+
+@fallback_call
+def get_index_directory_key(url, requirement):
+    """Returns directory hash based on egg requirement.
+    """
+    urlmd5 = hashlib.md5(url.encode()).hexdigest()
+    return 'pypi-index-%s-%s' % (urlmd5, requirement)
+
+
+@fallback_call
+def download_network_cached(dir_url, cache_url, path, url, logger,
+                            signature_certificate_list, md5sum=None):
+    """Downloads from a network cache provider
+
+    If something fail (providor be offline, or hash_string fail), we ignore
+    network cached files.
+
+    return True if download succeeded.
+    """
+    if not LIBNETWORKCACHE_ENABLED:
+        return False
+
+    if md5sum is None:
+        md5sum = _get_md5_from_url(url)
+
+    directory_key = get_directory_key(url)
+
+    logger.debug('Trying to download %s from network cache...', url)
+
+    if helper_download_network_cached_to_file(
+       dir_url=dir_url,
+       cache_url=cache_url,
+       signature_certificate_list=signature_certificate_list,
+       directory_key=directory_key,
+       path=path):
+        logger.info('Downloaded %s from network cache.', url)
+
+        if check_md5sum(path, md5sum):
+            return True
+        logger.info('MD5 checksum mismatch downloading %s', url)
+    else:
+        logger.info('Cannot download %s from network cache.', url)
+    return False
+
+@fallback_call
+def download_index_network_cached(dir_url, cache_url, url, requirement, logger,
+                            signature_certificate_list):
+    """
+    XXX description
+    Downloads pypi index from a network cache provider
+
+    If something fail (providor be offline, or hash_string fail), we ignore
+    network cached index.
+
+    return index if succeeded, False otherwise.
+    """
+    if not LIBNETWORKCACHE_ENABLED:
+        return False
+
+    directory_key = get_index_directory_key(url, requirement)
+
+    wanted_metadata_dict = {
+       'urlmd5': hashlib.md5(url.encode()).hexdigest(),
+       'requirement': requirement,
+    }
+    required_key_list = ['base']
+
+    result = helper_download_network_cached(dir_url, cache_url,
+       signature_certificate_list,
+       directory_key, wanted_metadata_dict, required_key_list)
+    if result:
+        file_descriptor, metadata = result
+        try:
+            content = strify(file_descriptor.read())
+            logger.info('Downloaded %s from network cache.', url)
+            return content, metadata['base']
+        except (IOError, DirectoryNotFound) as e:
+            if isinstance(e, HTTPError) and e.code == 404:
+              logger.debug('%s does not exist in network cache.', url)
+            else:
+              logger.debug('Failed to download from network cache %s: %s',
+                  url, e)
+    return False
+
+@fallback_call
+def upload_network_cached(dir_url, cache_url, external_url, path, logger,
+   signature_private_key_file, shacache_ca_file, shacache_cert_file,
+   shacache_key_file, shadir_ca_file, shadir_cert_file, shadir_key_file):
+    """Upload file to a network cache server"""
+    # XXX use helper and FACTOR code
+    if not LIBNETWORKCACHE_ENABLED:
+        return False
+
+    if not (dir_url and cache_url):
+        return False
+
+    logger.info('Uploading %s into network cache.', external_url)
+
+    file_name = get_filename_from_url(external_url)
+
+    directory_key = get_directory_key(external_url)
+    kw = dict(file_name=file_name,
+              urlmd5=hashlib.md5(external_url.encode()).hexdigest())
+
+    # convert '' into None in order to call nc nicely
+    if not signature_private_key_file:
+        signature_private_key_file = None
+    if not shacache_ca_file:
+        shacache_ca_file = None
+    if not shacache_cert_file:
+        shacache_cert_file = None
+    if not shacache_key_file:
+        shacache_key_file = None
+    if not shadir_ca_file:
+        shadir_ca_file = None
+    if not shadir_cert_file:
+        shadir_cert_file = None
+    if not shadir_key_file:
+        shadir_key_file = None
+    try:
+        nc = NetworkcacheClient(cache_url, dir_url,
+            signature_private_key_file=signature_private_key_file,
+            shacache_ca_file=shacache_ca_file,
+            shacache_cert_file=shacache_cert_file,
+            shacache_key_file=shacache_key_file,
+            shadir_ca_file=shadir_ca_file,
+            shadir_cert_file=shadir_cert_file,
+            shadir_key_file=shadir_key_file)
+    except TypeError:
+        logger.warning('Incompatible version of networkcache, not using it.')
+        return False
+
+    try:
+        with open(path, 'rb') as f:
+            return nc.upload(f, directory_key, **kw)
+    except (IOError, UploadError) as e:
+        logger.info('Fail to upload file. %s', e)
+        return False
+
+@fallback_call
+def upload_index_network_cached(dir_url, cache_url, external_url, base, requirement, content, logger,
+   signature_private_key_file, shacache_ca_file, shacache_cert_file,
+   shacache_key_file, shadir_ca_file, shadir_cert_file, shadir_key_file):
+    # XXX use helper and FACTOR code
+    """Upload content of a web page to a network cache server"""
+    if not LIBNETWORKCACHE_ENABLED:
+        return False
+
+    if not (dir_url and cache_url):
+        return False
+
+    logger.info('Uploading %s content into network cache.', external_url)
+
+    directory_key = get_index_directory_key(external_url, requirement)
+    kw = dict(file="file",
+              base=base,
+              urlmd5=hashlib.md5(external_url.encode()).hexdigest(),
+              requirement=requirement)
+
+    import tempfile
+    f = tempfile.TemporaryFile()
+    f.write(content.encode())
+
+    # convert '' into None in order to call nc nicely
+    if not signature_private_key_file:
+        signature_private_key_file = None
+    if not shacache_ca_file:
+        shacache_ca_file = None
+    if not shacache_cert_file:
+        shacache_cert_file = None
+    if not shacache_key_file:
+        shacache_key_file = None
+    if not shadir_ca_file:
+        shadir_ca_file = None
+    if not shadir_cert_file:
+        shadir_cert_file = None
+    if not shadir_key_file:
+        shadir_key_file = None
+    try:
+        nc = NetworkcacheClient(cache_url, dir_url,
+            signature_private_key_file=signature_private_key_file,
+            shacache_ca_file=shacache_ca_file,
+            shacache_cert_file=shacache_cert_file,
+            shacache_key_file=shacache_key_file,
+            shadir_ca_file=shadir_ca_file,
+            shadir_cert_file=shadir_cert_file,
+            shadir_key_file=shadir_key_file)
+    except TypeError:
+        logger.warning('Incompatible version of networkcache, not using it.')
+        return False
+
+    try:
+        return nc.upload_generic(f, directory_key, **kw)
+    except (IOError, UploadError) as e:
+        logger.info('Fail to upload file. %s', e)
+        return False
+
+    finally:
+      f.close()
+
+    return True
+
+
+@fallback_call
+def get_filename_from_url(url):
+    """Inspired how pip get filename from url.
+    """
+    parsed_url = urlparse(url)
+    if parsed_url.query and parsed_url.path.endswith('/'):
+      name = parsed_url.query.split('?', 1)[0]
+    elif parsed_url.path.endswith('/') and not parsed_url.query:
+      name = parsed_url.path.split('/')[-2]
+    else:
+      name = posixpath.basename(parsed_url.path)
+
+    name = name.split('#', 1)[0]
+    assert name, (
+           'URL %r produced no filename' % url)
+    return name
+
+
+from .download import check_md5sum