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// Copyright 2015 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE.client file for details.
package candidclient
import (
"context"
"sort"
"time"
"github.com/juju/utils/v2/cache"
"gopkg.in/errgo.v1"
"github.com/canonical/candid/params"
)
// GroupCache holds a cache of group membership information.
type GroupCache struct {
cache *cache.Cache
client *Client
}
// NewGroupCache returns a GroupCache that will cache
// group membership information.
//
// It will cache results for at most cacheTime.
//
// Note that use of this type should be avoided when possible - in
// the future it may not be possible to enumerate group membership
// for a user.
func NewGroupCache(c *Client, cacheTime time.Duration) *GroupCache {
return &GroupCache{
cache: cache.New(cacheTime),
client: c,
}
}
// Groups returns the set of groups that the user is a member of.
func (gc *GroupCache) Groups(username string) ([]string, error) {
groupMap, err := gc.groupMap(username)
if err != nil {
return nil, errgo.Mask(err)
}
groups := make([]string, 0, len(groupMap))
for g := range groupMap {
groups = append(groups, g)
}
sort.Strings(groups)
return groups, nil
}
func (gc *GroupCache) groupMap(username string) (map[string]bool, error) {
groups0, err := gc.cache.Get(username, func() (interface{}, error) {
groups, err := gc.client.UserGroups(context.TODO(), ¶ms.UserGroupsRequest{
Username: params.Username(username),
})
if err != nil && errgo.Cause(err) != params.ErrNotFound {
return nil, errgo.Mask(err)
}
groupMap := make(map[string]bool)
for _, g := range groups {
groupMap[g] = true
}
return groupMap, nil
})
if err != nil {
return nil, errgo.Notef(err, "cannot fetch groups")
}
return groups0.(map[string]bool), nil
}
// CacheEvict evicts username from the cache.
func (c *GroupCache) CacheEvict(username string) {
c.cache.Evict(username)
}
// CacheEvictAll evicts everything from the cache.
func (c *GroupCache) CacheEvictAll() {
c.cache.EvictAll()
}
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