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cache-memcached.go
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cache-memcached.go
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package gobinsec
import (
"errors"
"fmt"
"os"
"time"
"github.com/bradfitz/gomemcache/memcache"
)
const (
MemcachedDefaultTimeout = 1 * time.Second
MemcachedDefaultExpiration = 24 * time.Hour
)
// MemcachedConfig is the configuration for memcached
type MemcachedConfig struct {
Address string `yaml:"address"`
Timeout time.Duration `yaml:"timeout"`
Expiration time.Duration `yaml:"expiration"`
}
// MemcachedClient is the Cache using memcached
type MemcachedClient struct {
Client *memcache.Client
Expiration time.Duration
}
// NewMemcachedCache builds a memcached cache
func NewMemcachedCache(config *MemcachedConfig) (Cache, error) {
config, err := NewMemcachedConfig(config)
if err != nil {
return nil, err
}
if config == nil {
return nil, nil
}
client := memcache.New(config.Address)
client.Timeout = config.Timeout
cache := MemcachedClient{
Client: client,
Expiration: config.Expiration,
}
return &cache, nil
}
// NewMemcachedConfig returns configuration
func NewMemcachedConfig(config *MemcachedConfig) (*MemcachedConfig, error) {
if config != nil {
if config.Timeout == 0 {
config.Timeout = MemcachedDefaultTimeout
}
if config.Expiration == 0 {
config.Expiration = MemcachedDefaultExpiration
}
return config, nil
} else if os.Getenv("MEMCACHED_ADDRESS") != "" {
address := os.Getenv("MEMCACHED_ADDRESS")
timeout, err := ParseDuration(os.Getenv("MEMCACHED_TIMEOUT"), MemcachedDefaultTimeout)
if err != nil {
return nil, fmt.Errorf("parsing memcached timeout: %v", err)
}
expiration, err := ParseDuration(os.Getenv("MEMCACHED_EXPIRATION"), MemcachedDefaultExpiration)
if err != nil {
return nil, fmt.Errorf("parsing memcached expiration: %v", err)
}
c := MemcachedConfig{
Address: address,
Timeout: timeout,
Expiration: expiration,
}
return &c, nil
} else {
return nil, nil
}
}
// Name returns the name of this cache
func (mc *MemcachedClient) Name() string {
return "Memcached"
}
// Get returns NVD response for given dependency
func (mc *MemcachedClient) Get(d *Dependency) ([]byte, error) {
item, err := mc.Client.Get(d.Key())
if err != nil && !errors.Is(err, memcache.ErrCacheMiss) {
return nil, fmt.Errorf("getting on memcached: %v", err)
}
if item == nil {
return nil, nil
}
return item.Value, nil
}
// Set put NVD response for given dependency in cache
func (mc *MemcachedClient) Set(d *Dependency, v []byte) error {
item := memcache.Item{
Key: d.Key(),
Value: v,
Expiration: int32(mc.Expiration.Seconds()),
}
if err := mc.Client.Set(&item); err != nil {
return fmt.Errorf("setting on memcached: %v", err)
}
return nil
}
// Ping calls memcached
func (mc *MemcachedClient) Open() error {
return mc.Client.Ping()
}
// Clean does nothing
func (mc *MemcachedClient) Close() error {
return nil
}