Re: [PATCH sandbox v5 06/20] Image: Add download function

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On Wed, Sep 09, 2015 at 01:50:11PM +0200, Cedric Bosdonnat wrote:
> On Tue, 2015-09-08 at 17:29 +0100, Daniel P. Berrange wrote:
> > From: Eren Yagdiran <erenyagdiran@xxxxxxxxx>
> > 
> > Refactor download function from virt-sandbox-image to use
> > the newly introduced Source abstract class. The docker-specific
> > download code is moved to a new DockerSource class.
> > 
> > Signed-off-by: Daniel P. Berrange <berrange@xxxxxxxxxx>
> > ---
> >  libvirt-sandbox/image/cli.py                  | 204 ++++---------------------
> >  libvirt-sandbox/image/sources/DockerSource.py | 209 ++++++++++++++++++++++++++
> >  libvirt-sandbox/image/sources/Makefile.am     |   1 +
> >  libvirt-sandbox/image/sources/Source.py       |  15 ++
> >  4 files changed, 257 insertions(+), 172 deletions(-)
> >  create mode 100644 libvirt-sandbox/image/sources/DockerSource.py
> > 
> > diff --git a/libvirt-sandbox/image/cli.py b/libvirt-sandbox/image/cli.py
> > index de34321..7af617e 100755
> > --- a/libvirt-sandbox/image/cli.py
> > +++ b/libvirt-sandbox/image/cli.py
> > @@ -69,176 +69,6 @@ def debug(msg):
> >  def info(msg):
> >      sys.stdout.write(msg)
> >  
> > -def get_url(server, path, headers):
> > -    url = "https://"; + server + path
> > -    debug("  Fetching %s..." % url)
> > -    req = urllib2.Request(url=url)
> > -
> > -    if json:
> > -        req.add_header("Accept", "application/json")
> > -
> > -    for h in headers.keys():
> > -        req.add_header(h, headers[h])
> > -
> > -    return urllib2.urlopen(req)
> > -
> > -def get_json(server, path, headers):
> > -    try:
> > -        res = get_url(server, path, headers)
> > -        data = json.loads(res.read())
> > -        debug("OK\n")
> > -        return (data, res)
> > -    except Exception, e:
> > -        debug("FAIL %s\n" % str(e))
> > -        raise
> > -
> > -def save_data(server, path, headers, dest, checksum=None, datalen=None):
> > -    try:
> > -        res = get_url(server, path, headers)
> > -
> > -        csum = None
> > -        if checksum is not None:
> > -            csum = hashlib.sha256()
> > -
> > -        pattern = [".", "o", "O", "o"]
> > -        patternIndex = 0
> > -        donelen = 0
> > -
> > -        with open(dest, "w") as f:
> > -            while 1:
> > -                buf = res.read(1024*64)
> > -                if not buf:
> > -                    break
> > -                if csum is not None:
> > -                    csum.update(buf)
> > -                f.write(buf)
> > -
> > -                if datalen is not None:
> > -                    donelen = donelen + len(buf)
> > -                    debug("\x1b[s%s (%5d Kb of %5d Kb)\x1b8" % (
> > -                        pattern[patternIndex], (donelen/1024), (datalen/1024)
> > -                    ))
> > -                    patternIndex = (patternIndex + 1) % 4
> > -
> > -        debug("\x1b[K")
> > -        if csum is not None:
> > -            csumstr = "sha256:" + csum.hexdigest()
> > -            if csumstr != checksum:
> > -                debug("FAIL checksum '%s' does not match '%s'" % (csumstr, checksum))
> > -                os.remove(dest)
> > -                raise IOError("Checksum '%s' for data does not match '%s'" % (csumstr, checksum))
> > -        debug("OK\n")
> > -        return res
> > -    except Exception, e:
> > -        debug("FAIL %s\n" % str(e))
> > -        raise
> > -
> > -
> > -def download_template(name, server, destdir):
> > -    tag = "latest"
> > -
> > -    offset = name.find(':')
> > -    if offset != -1:
> > -        tag = name[offset + 1:]
> > -        name = name[0:offset]
> > -
> > -    # First we must ask the index server about the image name. THe
> > -    # index server will return an auth token we can use when talking
> > -    # to the registry server. We need this token even when anonymous
> > -    try:
> > -        (data, res) = get_json(server, "/v1/repositories/" + name + "/images",
> > -                               {"X-Docker-Token": "true"})
> > -    except urllib2.HTTPError, e:
> > -        raise ValueError(["Image '%s' does not exist" % name])
> > -
> > -    registryserver = res.info().getheader('X-Docker-Endpoints')
> > -    token = res.info().getheader('X-Docker-Token')
> > -    checksums = {}
> > -    for layer in data:
> > -        pass
> > -        # XXX Checksums here don't appear to match the data in
> > -        # image download later. Find out what these are sums of
> > -        #checksums[layer["id"]] = layer["checksum"]
> > -
> > -    # Now we ask the registry server for the list of tags associated
> > -    # with the image. Tags usually reflect some kind of version of
> > -    # the image, but they aren't officially "versions". There is
> > -    # always a "latest" tag which is the most recent upload
> > -    #
> > -    # We must pass in the auth token from the index server. This
> > -    # token can only be used once, and we're given a cookie back
> > -    # in return to use for later RPC calls.
> > -    (data, res) = get_json(registryserver, "/v1/repositories/" + name + "/tags",
> > -                           { "Authorization": "Token " + token })
> > -
> > -    cookie = res.info().getheader('Set-Cookie')
> > -
> > -    if not tag in data:
> > -        raise ValueError(["Tag '%s' does not exist for image '%s'" % (tag, name)])
> > -    imagetagid = data[tag]
> > -
> > -    # Only base images are self-contained, most images reference one
> > -    # or more parents, in a linear stack. Here we are getting the list
> > -    # of layers for the image with the tag we used.
> > -    (data, res) = get_json(registryserver, "/v1/images/" + imagetagid + "/ancestry",
> > -                           { "Authorization": "Token " + token })
> > -
> > -    if data[0] != imagetagid:
> > -        raise ValueError(["Expected first layer id '%s' to match image id '%s'",
> > -                          data[0], imagetagid])
> > -
> > -    try:
> > -        createdFiles = []
> > -        createdDirs = []
> > -
> > -        for layerid in data:
> > -            templatedir = destdir + "/" + layerid
> > -            if not os.path.exists(templatedir):
> > -                os.mkdir(templatedir)
> > -                createdDirs.append(templatedir)
> > -
> > -            jsonfile = templatedir + "/template.json"
> > -            datafile = templatedir + "/template.tar.gz"
> > -
> > -            if not os.path.exists(jsonfile) or not os.path.exists(datafile):
> > -                # The '/json' URL gives us some metadata about the layer
> > -                res = save_data(registryserver, "/v1/images/" + layerid + "/json",
> > -                                { "Authorization": "Token " + token }, jsonfile)
> > -                createdFiles.append(jsonfile)
> > -                layersize = int(res.info().getheader("Content-Length"))
> > -
> > -                datacsum = None
> > -                if layerid in checksums:
> > -                    datacsum = checksums[layerid]
> > -
> > -                # and the '/layer' URL is the actual payload, provided
> > -                # as a tar.gz archive
> > -                save_data(registryserver, "/v1/images/" + layerid + "/layer",
> > -                          { "Authorization": "Token " + token }, datafile, datacsum, layersize)
> > -                createdFiles.append(datafile)
> > -
> > -        # Strangely the 'json' data for a layer doesn't include
> > -        # its actual name, so we save that in a json file of our own
> > -        index = {
> > -            "name": name,
> > -        }
> > -
> > -        indexfile = destdir + "/" + imagetagid + "/index.json"
> > -        with open(indexfile, "w") as f:
> > -            f.write(json.dumps(index))
> > -    except Exception, e:
> > -        for f in createdFiles:
> > -            try:
> > -                os.remove(f)
> > -            except:
> > -                pass
> > -        for d in createdDirs:
> > -            try:
> > -                os.rmdir(d)
> > -            except:
> > -                pass
> > -
> > -
> >  def delete_template(name, destdir):
> >      imageusage = {}
> >      imageparent = {}
> > @@ -342,8 +172,16 @@ def create_template(name, imagepath, format, destdir):
> >          parentImage = templateImage
> >  
> >  def download(args):
> > -    info("Downloading %s from %s to %s\n" % (args.template, default_index_server, default_template_dir))
> > -    download_template(args.template, default_index_server, default_template_dir)
> > +    try:
> > +        dynamic_source_loader(args.source).download_template(templatename=args.template,
> > +                                                             templatedir=args.template_dir,
> > +                                                             registry=args.registry,
> > +                                                             username=args.username,
> > +                                                             password=args.password)
> > +    except IOError,e:
> > +        print "Source %s cannot be found in given path" %args.source
> > +    except Exception,e:
> > +        print "Download Error %s" % str(e)
> >  
> >  def delete(args):
> >      info("Deleting %s from %s\n" % (args.template, default_template_dir))
> > @@ -357,10 +195,32 @@ def requires_template(parser):
> >      parser.add_argument("template",
> >                          help=_("name of the template"))
> >  
> > +def requires_source(parser):
> > +    parser.add_argument("-s","--source",
> > +                        default="docker",
> > +                        help=_("name of the template"))
> > +
> > +def requires_auth_conn(parser):
> > +    parser.add_argument("-r","--registry",
> > +                        help=_("Url of the custom registry"))
> 
> This wording really sounds docker-specific. The registry word only fits
> docker terminology, would surely not apply to virt-builder or appc case.
> Something like "images storage" would may be more generic. The problem
> is that "repository" has a special meaning in the docker terminology.

Yeah, I was thinking we might need some way to let source subclasses
add custom arguments. eg so we'd have  --docker-registry.

The appc spec doesn't have a concept of a central registry in the
same way as docker. Instead the image name encodes the domain
name, eg   example.com/someapp, and there's a protocol to use
this to identify the server, and then resolve the download URL

> ACK, but may need some thinking on the "Registry" word.

I'm inclined to merge this, and then fix it afterwards to be more
generic

Regards,
Daniel
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