| // Copyright 2017 The LUCI 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. |
| |
| // Package policy contains implementation of Policy parsing and querying. |
| // |
| // Policies are configs fetched from LUCI Config and used from Token Server RPCs |
| // for various decisions. Each policy is defined by one or more config files, |
| // all fetched at a single revision (for consistency) and cached in single |
| // datastore entity (for faster fetches). |
| // |
| // The defining properties of policy configs are: |
| // - They are global (i.e they are service configs, not per-project ones). |
| // - The content is mostly static. |
| // - They are queried from performance critical RPC handlers. |
| // |
| // This suggests to heavily cache policies in local instance memory in a form |
| // most suitable for querying. |
| // |
| // Thus policies have 3 representations: |
| // - Text protos: that's how they are stored in LUCI Config. |
| // - Binary protos: that's how Token Server stores them in the datastore. |
| // - Queryable state: that's how Token Server keeps them in the local memory. |
| package policy |
