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inmemory.go
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/
inmemory.go
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package usercache
import (
"context"
"sync"
"time"
"github.com/evergreen-ci/gimlet"
"github.com/evergreen-ci/gimlet/util"
"github.com/pkg/errors"
)
// NewInMemory returns a user cache which keeps entries in memory.
func NewInMemory(ctx context.Context, ttl time.Duration) Cache {
c := &userCache{
ttl: ttl,
cache: make(map[string]cacheValue),
userToToken: make(map[string]string),
}
go func() {
timer := time.NewTimer(ttl / 2)
defer timer.Stop()
for {
select {
case <-ctx.Done():
return
case <-timer.C:
c.clean()
timer.Reset(ttl / 2)
}
}
}()
return c
}
type cacheValue struct {
user gimlet.User
created time.Time
}
type userCache struct {
mu sync.RWMutex
ttl time.Duration
cache map[string]cacheValue
userToToken map[string]string
}
func (c *userCache) clean() {
c.mu.Lock()
defer c.mu.Unlock()
for k, v := range c.cache {
if time.Since(v.created) < c.ttl {
continue
}
delete(c.userToToken, v.user.Username())
delete(c.cache, k)
}
}
func (c *userCache) Add(u gimlet.User) error {
_, err := c.Put(u)
return errors.Wrap(err, "problem adding user")
}
func (c *userCache) Put(u gimlet.User) (string, error) {
c.mu.Lock()
defer c.mu.Unlock()
id := u.Username()
token, err := util.RandomString()
if err != nil {
return "", errors.Wrap(err, "error generating token")
}
c.userToToken[id] = token
c.cache[token] = cacheValue{
user: u,
created: time.Now(),
}
return token, nil
}
func (c *userCache) Get(token string) (gimlet.User, bool, error) {
c.mu.RLock()
defer c.mu.RUnlock()
u, ok := c.cache[token]
if !ok {
return nil, false, nil
}
if time.Since(u.created) >= c.ttl {
return u.user, false, nil
}
return u.user, true, nil
}
func (c *userCache) Clear(u gimlet.User, all bool) error {
c.mu.Lock()
defer c.mu.Unlock()
if all {
c.cache = make(map[string]cacheValue)
c.userToToken = make(map[string]string)
return nil
}
token, ok := c.userToToken[u.Username()]
if !ok {
return errors.New("invalid user")
}
delete(c.userToToken, u.Username())
delete(c.cache, token)
return nil
}
func (c *userCache) Find(id string) (gimlet.User, bool, error) {
c.mu.RLock()
defer c.mu.RUnlock()
token, ok := c.userToToken[id]
if !ok {
return nil, false, errors.Errorf("could not find user of id %s", id)
}
user, exists := c.cache[token]
if !exists {
return nil, false, errors.Errorf("could not find user of id %s", id)
}
if time.Since(user.created) >= c.ttl {
return user.user, false, nil
}
return user.user, true, nil
}
func (c *userCache) GetOrCreate(u gimlet.User) (gimlet.User, error) {
usr, _, err := c.Find(u.Username())
if err == nil {
return usr, nil
}
if err := c.Add(u); err != nil {
return nil, err
}
return u, nil
}