100 lines
2.3 KiB
Go
100 lines
2.3 KiB
Go
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// Copyright 2019 Drone IO, Inc.
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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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package orgs
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import (
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"context"
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"fmt"
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"sync"
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"time"
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"github.com/drone/drone/core"
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lru "github.com/hashicorp/golang-lru"
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)
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// content key pattern used in the cache, comprised of the
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// organization name and username.
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const contentKey = "%s/%s"
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// NewCache wraps the service with a simple cache to store
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// organization membership.
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func NewCache(base core.OrganizationService, size int, ttl time.Duration) core.OrganizationService {
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// simple cache prevents the same yaml file from being
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// requested multiple times in a short period.
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cache, _ := lru.New(25)
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return &cacher{
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cache: cache,
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base: base,
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size: size,
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ttl: ttl,
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}
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}
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type cacher struct {
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mu sync.Mutex
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base core.OrganizationService
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size int
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ttl time.Duration
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cache *lru.Cache
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}
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type item struct {
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expiry time.Time
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member bool
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admin bool
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}
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func (c *cacher) List(ctx context.Context, user *core.User) ([]*core.Organization, error) {
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return c.base.List(ctx, user)
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}
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func (c *cacher) Membership(ctx context.Context, user *core.User, name string) (bool, bool, error) {
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key := fmt.Sprintf(contentKey, user.Login, name)
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now := time.Now()
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// get the membership details from the cache.
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cached, ok := c.cache.Get(key)
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if ok {
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item := cached.(*item)
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// if the item is expired it can be ejected
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// from the cache, else if not expired we return
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// the cached results.
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if now.After(item.expiry) {
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c.cache.Remove(cached)
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} else {
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return item.member, item.admin, nil
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}
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}
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// get up-to-date membership details due to a cache
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// miss or expired cache item.
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member, admin, err := c.base.Membership(ctx, user, name)
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if err != nil {
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return false, false, err
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}
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c.cache.Add(key, &item{
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expiry: now.Add(c.ttl),
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member: member,
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admin: admin,
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})
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return member, admin, nil
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}
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