Darn it. Those shouldn't be there!

1 files changed, 345 insertions, 0 deletions

diff --git a/cloudinit/sources/DataSourceMAAS.py b/cloudinit/sources/DataSourceMAAS.py
new file mode 100644
index 00000000..61a0038f
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+++ b/cloudinit/sources/DataSourceMAAS.py
@@ -0,0 +1,345 @@
+# vi: ts=4 expandtab
+#
+#    Copyright (C) 2012 Canonical Ltd.
+#
+#    Author: Scott Moser <scott.moser@canonical.com>
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License version 3, as
+#    published by the Free Software Foundation.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import cloudinit.DataSource as DataSource
+
+from cloudinit import seeddir as base_seeddir
+from cloudinit import log
+import cloudinit.util as util
+import errno
+import oauth.oauth as oauth
+import os.path
+import urllib2
+import time
+
+
+MD_VERSION = "2012-03-01"
+
+
+class DataSourceMAAS(DataSource.DataSource):
+    """
+    DataSourceMAAS reads instance information from MAAS.
+    Given a config metadata_url, and oauth tokens, it expects to find
+    files under the root named:
+      instance-id
+      user-data
+      hostname
+    """
+    seeddir = base_seeddir + '/maas'
+    baseurl = None
+
+    def __str__(self):
+        return("DataSourceMAAS[%s]" % self.baseurl)
+
+    def get_data(self):
+        mcfg = self.ds_cfg
+
+        try:
+            (userdata, metadata) = read_maas_seed_dir(self.seeddir)
+            self.userdata_raw = userdata
+            self.metadata = metadata
+            self.baseurl = self.seeddir
+            return True
+        except MAASSeedDirNone:
+            pass
+        except MAASSeedDirMalformed as exc:
+            log.warn("%s was malformed: %s\n" % (self.seeddir, exc))
+            raise
+
+        try:
+            # if there is no metadata_url, then we're not configured
+            url = mcfg.get('metadata_url', None)
+            if url == None:
+                return False
+
+            if not self.wait_for_metadata_service(url):
+                return False
+
+            self.baseurl = url
+
+            (userdata, metadata) = read_maas_seed_url(self.baseurl,
+                self.md_headers)
+            self.userdata_raw = userdata
+            self.metadata = metadata
+            return True
+        except Exception:
+            util.logexc(log)
+            return False
+
+    def md_headers(self, url):
+        mcfg = self.ds_cfg
+
+        # if we are missing token_key, token_secret or consumer_key
+        # then just do non-authed requests
+        for required in ('token_key', 'token_secret', 'consumer_key'):
+            if required not in mcfg:
+                return({})
+
+        consumer_secret = mcfg.get('consumer_secret', "")
+
+        return(oauth_headers(url=url, consumer_key=mcfg['consumer_key'],
+            token_key=mcfg['token_key'], token_secret=mcfg['token_secret'],
+            consumer_secret=consumer_secret))
+
+    def wait_for_metadata_service(self, url):
+        mcfg = self.ds_cfg
+
+        max_wait = 120
+        try:
+            max_wait = int(mcfg.get("max_wait", max_wait))
+        except Exception:
+            util.logexc(log)
+            log.warn("Failed to get max wait. using %s" % max_wait)
+
+        if max_wait == 0:
+            return False
+
+        timeout = 50
+        try:
+            timeout = int(mcfg.get("timeout", timeout))
+        except Exception:
+            util.logexc(log)
+            log.warn("Failed to get timeout, using %s" % timeout)
+
+        starttime = time.time()
+        check_url = "%s/%s/meta-data/instance-id" % (url, MD_VERSION)
+        url = util.wait_for_url(urls=[check_url], max_wait=max_wait,
+            timeout=timeout, status_cb=log.warn,
+            headers_cb=self.md_headers)
+
+        if url:
+            log.debug("Using metadata source: '%s'" % url)
+        else:
+            log.critical("giving up on md after %i seconds\n" %
+                         int(time.time() - starttime))
+
+        return (bool(url))
+
+
+def read_maas_seed_dir(seed_d):
+    """
+    Return user-data and metadata for a maas seed dir in seed_d.
+    Expected format of seed_d are the following files:
+      * instance-id
+      * local-hostname
+      * user-data
+    """
+    files = ('local-hostname', 'instance-id', 'user-data', 'public-keys')
+    md = {}
+
+    if not os.path.isdir(seed_d):
+        raise MAASSeedDirNone("%s: not a directory")
+
+    for fname in files:
+        try:
+            with open(os.path.join(seed_d, fname)) as fp:
+                md[fname] = fp.read()
+                fp.close()
+        except IOError as e:
+            if e.errno != errno.ENOENT:
+                raise
+
+    return(check_seed_contents(md, seed_d))
+
+
+def read_maas_seed_url(seed_url, header_cb=None, timeout=None,
+    version=MD_VERSION):
+    """
+    Read the maas datasource at seed_url.
+    header_cb is a method that should return a headers dictionary that will
+    be given to urllib2.Request()
+
+    Expected format of seed_url is are the following files:
+      * <seed_url>/<version>/meta-data/instance-id
+      * <seed_url>/<version>/meta-data/local-hostname
+      * <seed_url>/<version>/user-data
+    """
+    files = ('meta-data/local-hostname',
+             'meta-data/instance-id',
+             'meta-data/public-keys',
+             'user-data')
+
+    base_url = "%s/%s" % (seed_url, version)
+    md = {}
+    for fname in files:
+        url = "%s/%s" % (base_url, fname)
+        if header_cb:
+            headers = header_cb(url)
+        else:
+            headers = {}
+
+        try:
+            req = urllib2.Request(url, data=None, headers=headers)
+            resp = urllib2.urlopen(req, timeout=timeout)
+            md[os.path.basename(fname)] = resp.read()
+        except urllib2.HTTPError as e:
+            if e.code != 404:
+                raise
+
+    return(check_seed_contents(md, seed_url))
+
+
+def check_seed_contents(content, seed):
+    """Validate if content is Is the content a dict that is valid as a
+       return for a datasource.
+       Either return a (userdata, metadata) tuple or
+       Raise MAASSeedDirMalformed or MAASSeedDirNone
+    """
+    md_required = ('instance-id', 'local-hostname')
+    found = content.keys()
+
+    if len(content) == 0:
+        raise MAASSeedDirNone("%s: no data files found" % seed)
+
+    missing = [k for k in md_required if k not in found]
+    if len(missing):
+        raise MAASSeedDirMalformed("%s: missing files %s" % (seed, missing))
+
+    userdata = content.get('user-data', "")
+    md = {}
+    for (key, val) in content.iteritems():
+        if key == 'user-data':
+            continue
+        md[key] = val
+
+    return(userdata, md)
+
+
+def oauth_headers(url, consumer_key, token_key, token_secret, consumer_secret):
+    consumer = oauth.OAuthConsumer(consumer_key, consumer_secret)
+    token = oauth.OAuthToken(token_key, token_secret)
+    params = {
+        'oauth_version': "1.0",
+        'oauth_nonce': oauth.generate_nonce(),
+        'oauth_timestamp': int(time.time()),
+        'oauth_token': token.key,
+        'oauth_consumer_key': consumer.key,
+    }
+    req = oauth.OAuthRequest(http_url=url, parameters=params)
+    req.sign_request(oauth.OAuthSignatureMethod_PLAINTEXT(),
+        consumer, token)
+    return(req.to_header())
+
+
+class MAASSeedDirNone(Exception):
+    pass
+
+
+class MAASSeedDirMalformed(Exception):
+    pass
+
+
+datasources = [
+  (DataSourceMAAS, (DataSource.DEP_FILESYSTEM, DataSource.DEP_NETWORK)),
+]
+
+
+# return a list of data sources that match this set of dependencies
+def get_datasource_list(depends):
+    return(DataSource.list_from_depends(depends, datasources))
+
+
+if __name__ == "__main__":
+    def main():
+        """
+        Call with single argument of directory or http or https url.
+        If url is given additional arguments are allowed, which will be
+        interpreted as consumer_key, token_key, token_secret, consumer_secret
+        """
+        import argparse
+        import pprint
+
+        parser = argparse.ArgumentParser(description='Interact with MAAS DS')
+        parser.add_argument("--config", metavar="file",
+            help="specify DS config file", default=None)
+        parser.add_argument("--ckey", metavar="key",
+            help="the consumer key to auth with", default=None)
+        parser.add_argument("--tkey", metavar="key",
+            help="the token key to auth with", default=None)
+        parser.add_argument("--csec", metavar="secret",
+            help="the consumer secret (likely '')", default="")
+        parser.add_argument("--tsec", metavar="secret",
+            help="the token secret to auth with", default=None)
+        parser.add_argument("--apiver", metavar="version",
+            help="the apiver to use ("" can be used)", default=MD_VERSION)
+
+        subcmds = parser.add_subparsers(title="subcommands", dest="subcmd")
+        subcmds.add_parser('crawl', help="crawl the datasource")
+        subcmds.add_parser('get', help="do a single GET of provided url")
+        subcmds.add_parser('check-seed', help="read andn verify seed at url")
+
+        parser.add_argument("url", help="the data source to query")
+
+        args = parser.parse_args()
+
+        creds = {'consumer_key': args.ckey, 'token_key': args.tkey,
+            'token_secret': args.tsec, 'consumer_secret': args.csec}
+
+        if args.config:
+            import yaml
+            with open(args.config) as fp:
+                cfg = yaml.load(fp)
+            if 'datasource' in cfg:
+                cfg = cfg['datasource']['MAAS']
+            for key in creds.keys():
+                if key in cfg and creds[key] == None:
+                    creds[key] = cfg[key]
+
+        def geturl(url, headers_cb):
+            req = urllib2.Request(url, data=None, headers=headers_cb(url))
+            return(urllib2.urlopen(req).read())
+
+        def printurl(url, headers_cb):
+            print "== %s ==\n%s\n" % (url, geturl(url, headers_cb))
+
+        def crawl(url, headers_cb=None):
+            if url.endswith("/"):
+                for line in geturl(url, headers_cb).splitlines():
+                    if line.endswith("/"):
+                        crawl("%s%s" % (url, line), headers_cb)
+                    else:
+                        printurl("%s%s" % (url, line), headers_cb)
+            else:
+                printurl(url, headers_cb)
+
+        def my_headers(url):
+            headers = {}
+            if creds.get('consumer_key', None) != None:
+                headers = oauth_headers(url, **creds)
+            return headers
+
+        if args.subcmd == "check-seed":
+            if args.url.startswith("http"):
+                (userdata, metadata) = read_maas_seed_url(args.url,
+                    header_cb=my_headers, version=args.apiver)
+            else:
+                (userdata, metadata) = read_maas_seed_url(args.url)
+            print "=== userdata ==="
+            print userdata
+            print "=== metadata ==="
+            pprint.pprint(metadata)
+
+        elif args.subcmd == "get":
+            printurl(args.url, my_headers)
+
+        elif args.subcmd == "crawl":
+            if not args.url.endswith("/"):
+                args.url = "%s/" % args.url
+            crawl(args.url, my_headers)
+
+    main()