| // Copyright 2021 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 gerrit |
| |
| import ( |
| "context" |
| "time" |
| |
| "go.chromium.org/luci/common/data/caching/lru" |
| ) |
| |
| // CachingFactory caches clients produced by another Factory. |
| func CachingFactory(lruSize int, f Factory) Factory { |
| return &cachingFactory{Factory: f, cache: lru.New(lruSize)} |
| } |
| |
| type cachingFactory struct { |
| Factory |
| cache *lru.Cache |
| } |
| |
| // MakeClient implements Factory. |
| func (c cachingFactory) MakeClient(ctx context.Context, gerritHost string, luciProject string) (Client, error) { |
| key := luciProject + "/" + gerritHost |
| client, err := c.cache.GetOrCreate(ctx, key, func() (value interface{}, ttl time.Duration, err error) { |
| // Default ttl of 0 means never expire. Note that specific authorization |
| // token is still loaded per each request (see transport() function). |
| value, err = c.Factory.MakeClient(ctx, gerritHost, luciProject) |
| return |
| }) |
| if err != nil { |
| return nil, err |
| } |
| return client.(Client), nil |
| } |