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cache.go
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cache.go
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package airgap
import (
"fmt"
"io"
"os"
"path"
"github.com/chef/automate/lib/io/fileutils"
"github.com/pkg/errors"
"github.com/chef/automate/components/automate-deployment/pkg/depot"
"github.com/chef/automate/components/automate-deployment/pkg/habpkg"
)
// FileCacher caches files
type FileCacher interface {
IsCached(filename string) bool
CacheFile(filename string, w func(io.Writer) error) error
}
type fileCacher struct {
cacheDir string
}
func (cache *fileCacher) IsCached(filename string) bool {
_, err := os.Stat(path.Join(cache.cacheDir, filename))
return err == nil
}
func (cache *fileCacher) CacheFile(filename string, w func(io.Writer) error) error {
filepath := path.Join(cache.cacheDir, filename)
err := fileutils.AtomicWriter(filepath, w)
if err != nil {
return errors.Wrap(err, "Could not cache artifact")
}
return nil
}
// HartifactCache stores harts
type HartifactCache interface {
// IsCached returns true if the given package already exists
IsCached(habpkg.VersionedPackage) bool
// CacheArtifact stores harts in the cache
CacheArtifact(habpkg.VersionedPackage, func(io.Writer) error) error
}
type hartifactCache struct {
cacher FileCacher
}
// NewHartifactCache returns a new HartifactCache
func NewHartifactCache(cacheDir string) HartifactCache {
return &hartifactCache{
cacher: &fileCacher{
cacheDir: cacheDir,
},
}
}
func (cache *hartifactCache) IsCached(pkg habpkg.VersionedPackage) bool {
return cache.cacher.IsCached(hartFilename(pkg))
}
func (cache *hartifactCache) CacheArtifact(pkg habpkg.VersionedPackage, w func(io.Writer) error) error {
return cache.cacher.CacheFile(hartFilename(pkg), w)
}
func hartFilename(pkg habpkg.VersionedPackage) string {
return fmt.Sprintf("%s-%s-%s-%s-x86_64-linux.hart", pkg.Origin(), pkg.Name(), pkg.Version(), pkg.Release())
}
// KeyCache stores origin public keys
type KeyCache interface {
// IsCached returns true if the given key already exists
IsCached(depot.OriginKeyName) bool
// CacheKey stores the key
CacheKey(depot.OriginKeyName, func(io.Writer) error) error
}
type keyCache struct {
cacher FileCacher
}
// NewKeyCache returns a new KeyCache
func NewKeyCache(cacheDir string) KeyCache {
return &keyCache{
cacher: &fileCacher{
cacheDir: cacheDir,
},
}
}
func (cache *keyCache) IsCached(keyName depot.OriginKeyName) bool {
return cache.cacher.IsCached(keyFilename(keyName))
}
func (cache *keyCache) CacheKey(keyName depot.OriginKeyName, w func(io.Writer) error) error {
return cache.cacher.CacheFile(keyFilename(keyName), w)
}
func keyFilename(keyName depot.OriginKeyName) string {
return fmt.Sprintf("%s.pub", string(keyName))
}