feat(cli): Add delete command

This PS adds delete command to delete releases with armada.

the delete command removes all releases via a manifest file or
removes a release to target release name.

Closes #93

Change-Id: I5aa6fc7a2f3f1aaab73797b22abf692369241f9c

armada/cli/delete.py

@@ -0,0 +1,136 @@
+# Copyright 2017 The Armada Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import yaml
+
+import click
+
+from armada.cli import CliAction
+from armada import const
+from armada.handlers.manifest import Manifest
+from armada.handlers.tiller import Tiller
+from armada.utils.release import release_prefix
+
+
+@click.group()
+def delete():
+    """ Delete releases by targeting specific releases or via a manifest file.
+
+    """
+
+
+DESC = """
+This command deletes releases.
+
+The delete command will delete the releases either via a manifest
+or by targeting specific releases.
+
+To delete all the releases that are created by the armada manifest:
+
+    $ armada delete --manifest examples/simple.yaml
+
+To delete releases by the name:
+
+    $ armada delete --releases blog-1
+
+    or
+
+    $ armada delete --releases blog-1,blog-2,blog-3
+
+"""
+
+SHORT_DESC = "command delete releases"
+
+
+@delete.command(name='delete', help=DESC, short_help=SHORT_DESC)
+@click.option('--manifest', help='Armada manifest file', type=str)
+@click.option(
+    '--releases', help='Comma-separated list of release names', type=str)
+@click.option(
+    '--no-purge', help="Deletes release without purge option", is_flag=True)
+@click.option('--tiller-host', help="Tiller Host IP")
+@click.option(
+    '--tiller-port', help="Tiller host Port", type=int, default=44134)
+@click.pass_context
+def delete_charts(ctx, manifest, releases, no_purge, tiller_host, tiller_port):
+    DeleteChartManifest(
+        ctx, manifest, releases, no_purge, tiller_host, tiller_port).invoke()
+
+
+class DeleteChartManifest(CliAction):
+    def __init__(self, ctx, manifest, releases, no_purge, tiller_host,
+                 tiller_port):
+
+        super(DeleteChartManifest, self).__init__()
+        self.ctx = ctx
+        self.manifest = manifest
+        self.releases = releases
+        self.purge = not no_purge
+        self.tiller_host = tiller_host
+        self.tiller_port = tiller_port
+
+    def invoke(self):
+        tiller = Tiller(
+            tiller_host=self.tiller_host, tiller_port=self.tiller_port)
+        known_release_names = [release[0] for release in tiller.list_charts()]
+
+        if self.releases:
+            target_releases = [r.strip() for r in self.releases.split(',')
+                               if r.strip() in known_release_names]
+            if not target_releases:
+                self.logger.info("There's no release to delete.")
+                return
+
+            if not self.ctx.obj.get('api', False):
+                for r in target_releases:
+                    self.logger.info("Deleting release %s", r)
+                    tiller.uninstall_release(r, purge=self.purge)
+
+            else:
+                raise NotImplementedError()
+
+        if self.manifest:
+            target_releases = []
+
+            with open(self.manifest) as f:
+                documents = yaml.safe_load_all(f.read())
+            try:
+                armada_obj = Manifest(documents).get_manifest()
+                prefix = armada_obj.get(const.KEYWORD_ARMADA).get(
+                    const.KEYWORD_PREFIX)
+
+                for group in armada_obj.get(const.KEYWORD_ARMADA).get(
+                        const.KEYWORD_GROUPS):
+                    for ch in group.get(const.KEYWORD_CHARTS):
+                        release_name = release_prefix(
+                            prefix, ch.get('chart').get('chart_name'))
+                        if release_name in known_release_names:
+                            target_releases.append(release_name)
+            except yaml.YAMLError as e:
+                mark = e.problem_mark
+                self.logger.info("While parsing the manifest file, %s. "
+                                 "Error position: (%s:%s)", e.problem,
+                                 mark.line + 1, mark.column + 1)
+
+            if not target_releases:
+                self.logger.info("There's no release to delete.")
+                return
+
+            if not self.ctx.obj.get('api', False):
+                for r in target_releases:
+                    self.logger.info("Deleting release %s", r)
+                    tiller.uninstall_release(r, purge=self.purge)
+
+            else:
+                raise NotImplementedError()

armada/handlers/tiller.py

@@ -446,6 +446,8 @@ class Tiller(object):
         # build release install request
         try:
             stub = ReleaseServiceStub(self.channel)
+            LOG.info("Uninstall %s release with disable_hooks=%s, "
+                     "purge=%s flags", release, disable_hooks, purge)
             release_request = UninstallReleaseRequest(
                 name=release, disable_hooks=disable_hooks, purge=purge)
 

armada/shell.py

@@ -19,6 +19,7 @@ from oslo_config import cfg
 from oslo_log import log
 
 from armada.cli.apply import apply_create
+from armada.cli.delete import delete_charts
 from armada.cli.test import test_charts
 from armada.cli.tiller import tiller_service
 from armada.cli.validate import validate_manifest
@@ -47,6 +48,7 @@ def main(ctx, debug, api, url, token):
 
     \b
     $ armada apply
+    $ armada delete
     $ armada test
     $ armada tiller
     $ armada validate
@@ -87,6 +89,7 @@ def main(ctx, debug, api, url, token):
 
 
 main.add_command(apply_create)
+main.add_command(delete_charts)
 main.add_command(test_charts)
 main.add_command(tiller_service)
 main.add_command(validate_manifest)