136 lines
4.8 KiB
Python
136 lines
4.8 KiB
Python
# -*- coding: utf-8 -*- #
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# Copyright 2015 Google LLC. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""`gcloud app services set-traffic` command."""
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import unicode_literals
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from googlecloudsdk.api_lib.app import appengine_api_client
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from googlecloudsdk.api_lib.app import operations_util
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from googlecloudsdk.api_lib.app import service_util
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from googlecloudsdk.calliope import arg_parsers
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from googlecloudsdk.calliope import base
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from googlecloudsdk.core import exceptions
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from googlecloudsdk.core import log
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from googlecloudsdk.core.console import console_io
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from googlecloudsdk.core.resource import resource_printer
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import six
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class TrafficSplitError(exceptions.Error):
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"""Errors occurring when setting traffic splits."""
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pass
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class SetTraffic(base.Command):
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"""Set traffic splitting settings.
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This command sets the traffic split of versions across a service or a project.
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"""
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detailed_help = {
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'EXAMPLES': """\
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To send all traffic to 'v2' of service 's1', run:
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$ {command} s1 --splits=v2=1
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To split traffic evenly between 'v1' and 'v2' of service 's1', run:
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$ {command} s1 --splits=v2=.5,v1=.5
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To split traffic across all services:
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$ {command} --splits=v2=.5,v1=.5
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""",
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}
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@staticmethod
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def Args(parser):
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parser.add_argument('services', nargs='*', help=(
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'The services to modify.'))
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parser.add_argument(
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'--splits',
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required=True,
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type=arg_parsers.ArgDict(min_length=1),
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help="""\
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Key-value pairs describing what proportion of traffic should go to
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each version. The split values are added together and used as
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weights. The exact values do not matter, only their relation to each
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other. For example, v1=2,v2=2 is equivalent to v1=.5,v2=.5""")
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parser.add_argument(
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'--split-by',
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choices=['cookie', 'ip', 'random'],
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default='ip',
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help='Whether to split traffic based on cookie, IP address or random.')
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parser.add_argument(
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'--migrate',
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action='store_true',
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default=False,
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help="""\
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The migrate flag determines whether or not to use traffic migration
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during the operation. Traffic migration will attempt to automatically
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migrate traffic from the previous version to the new version, giving
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the autoscaler time to respond. See the documentation here:
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[](https://cloud.google.com/appengine/docs/python/console/trafficmigration)
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for more information.""")
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def Run(self, args):
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if args.migrate and len(args.splits) > 1:
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raise TrafficSplitError('The migrate flag can only be used with splits '
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'to a single version.')
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api_client = appengine_api_client.GetApiClientForTrack(self.ReleaseTrack())
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all_services = api_client.ListServices()
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services = service_util.GetMatchingServices(all_services, args.services)
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allocations = service_util.ParseTrafficAllocations(
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args.splits, args.split_by)
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display_allocations = []
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for service in services:
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for version, split in six.iteritems(allocations):
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display_allocations.append('{0}/{1}/{2}: {3}'.format(
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api_client.project,
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service.id,
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version,
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split))
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fmt = 'list[title="Setting the following traffic allocation:"]'
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resource_printer.Print(display_allocations, fmt, out=log.status)
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log.status.Print(
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'NOTE: Splitting traffic by {0}.'.format(args.split_by))
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log.status.Print('Any other versions of the specified service will '
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'receive zero traffic.')
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console_io.PromptContinue(cancel_on_no=True)
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errors = {}
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for service in services:
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try:
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operations_util.CallAndCollectOpErrors(
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api_client.SetTrafficSplit, service.id, allocations,
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args.split_by.upper(), args.migrate)
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except operations_util.MiscOperationError as err:
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errors[service.id] = six.text_type(err)
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if errors:
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printable_errors = {}
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for service, error_msg in errors.items():
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printable_errors[service] = error_msg
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raise TrafficSplitError(
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'Issue setting traffic on service(s): {0}\n\n'.format(
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', '.join(list(printable_errors.keys()))) +
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'\n\n'.join(list(printable_errors.values())))
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