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registry.go
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registry.go
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package image
import (
"crypto/tls"
"crypto/x509"
"fmt"
"io/ioutil"
"net"
"net/http"
"time"
regauthn "github.com/google/go-containerregistry/pkg/authn"
regname "github.com/google/go-containerregistry/pkg/name"
regv1 "github.com/google/go-containerregistry/pkg/v1"
regremote "github.com/google/go-containerregistry/pkg/v1/remote"
)
type RegistryOpts struct {
CACertPaths []string
VerifyCerts bool
}
type Registry struct {
opts RegistryOpts
}
func NewRegistry(opts RegistryOpts) Registry {
return Registry{opts}
}
func (i Registry) Generic(ref regname.Reference) (regv1.Descriptor, error) {
opts, err := i.imageOpts()
if err != nil {
return regv1.Descriptor{}, err
}
desc, err := regremote.Get(ref, opts...)
if err != nil {
return regv1.Descriptor{}, err
}
return desc.Descriptor, nil
}
func (i Registry) Image(ref regname.Reference) (regv1.Image, error) {
opts, err := i.imageOpts()
if err != nil {
return nil, err
}
return regremote.Image(ref, opts...)
}
func (i Registry) WriteImage(ref regname.Reference, img regv1.Image) error {
httpTran, err := i.newHTTPTransport()
if err != nil {
return err
}
authz, err := regauthn.DefaultKeychain.Resolve(ref.Context().Registry)
if err != nil {
return fmt.Errorf("Getting authz details: %s", err)
}
err = i.retry(func() error { return regremote.Write(ref, img, authz, httpTran) })
if err != nil {
return fmt.Errorf("Writing image: %s", err)
}
return nil
}
func (i Registry) Index(ref regname.Reference) (regv1.ImageIndex, error) {
opts, err := i.imageOpts()
if err != nil {
return nil, err
}
return regremote.Index(ref, opts...)
}
func (i Registry) WriteIndex(ref regname.Reference, idx regv1.ImageIndex) error {
httpTran, err := i.newHTTPTransport()
if err != nil {
return err
}
authz, err := regauthn.DefaultKeychain.Resolve(ref.Context().Registry)
if err != nil {
return fmt.Errorf("Getting authz details: %s", err)
}
err = i.retry(func() error { return regremote.WriteIndex(ref, idx, authz, httpTran) })
if err != nil {
return fmt.Errorf("Writing image index: %s", err)
}
return nil
}
func (i Registry) imageOpts() ([]regremote.ImageOption, error) {
httpTran, err := i.newHTTPTransport()
if err != nil {
return nil, err
}
return []regremote.ImageOption{
regremote.WithTransport(httpTran),
regremote.WithAuthFromKeychain(regauthn.DefaultKeychain),
}, nil
}
func (i Registry) newHTTPTransport() (*http.Transport, error) {
pool, err := x509.SystemCertPool()
if err != nil {
pool = x509.NewCertPool()
}
if len(i.opts.CACertPaths) > 0 {
for _, path := range i.opts.CACertPaths {
if certs, err := ioutil.ReadFile(path); err != nil {
return nil, fmt.Errorf("Reading CA certificates from '%s': %s", path, err)
} else if ok := pool.AppendCertsFromPEM(certs); !ok {
return nil, fmt.Errorf("Adding CA certificates from '%s': failed", path)
}
}
}
// Copied from https://github.com/golang/go/blob/release-branch.go1.12/src/net/http/transport.go#L42-L53
// We want to use the DefaultTransport but change its TLSClientConfig. There
// isn't a clean way to do this yet: https://github.com/golang/go/issues/26013
return &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
DualStack: true,
}).DialContext,
MaxIdleConns: 100,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ResponseHeaderTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
// Use the cert pool with k8s cert bundle appended.
TLSClientConfig: &tls.Config{
RootCAs: pool,
InsecureSkipVerify: (i.opts.VerifyCerts == false),
},
}, nil
}
func (i Registry) retry(doFunc func() error) error {
var lastErr error
for i := 0; i < 5; i++ {
lastErr = doFunc()
if lastErr == nil {
return nil
}
time.Sleep(1 * time.Second)
}
return fmt.Errorf("Retried 5 times: %s", lastErr)
}