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|
package tokencache
import (
"bytes"
"context"
"sync"
"time"
"github.com/sassoftware/relic/v7/token"
)
// Cache keys fetched from an underlying token
type Cache struct {
token.Token
keys map[string]cachedKey
mu sync.Mutex
expiry time.Duration
}
func New(base token.Token, expiry time.Duration) *Cache {
return &Cache{
Token: base,
keys: make(map[string]cachedKey),
expiry: expiry,
}
}
type cachedKey struct {
expires time.Time
key token.Key
}
func (c *Cache) GetKey(ctx context.Context, keyName string) (token.Key, error) {
c.mu.Lock()
defer c.mu.Unlock()
wantKeyID := token.KeyID(ctx)
cached := c.keys[keyName]
if cached.key != nil && cached.expires.After(time.Now()) {
// if caller is looking for a particular key ID, make sure the cached
// one matches before returning it
haveKeyID := cached.key.GetID()
if len(wantKeyID) == 0 || bytes.Equal(wantKeyID, haveKeyID) {
return cached.key, nil
}
}
key, err := c.Token.GetKey(ctx, keyName)
if err != nil {
return nil, err
}
if c.expiry > 0 && len(wantKeyID) == 0 {
// only cache if the caller did not request a specific key ID
c.keys[keyName] = cachedKey{
expires: time.Now().Add(c.expiry),
key: key,
}
}
return key, nil
}
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