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client.go
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client.go
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package apprclient
import (
"errors"
"fmt"
"strings"
)
// Client exposes the functionality of app registry server
type Client interface {
// RetrieveAll retrieves all visible packages from the given source
// When namespace is specified, only package(s) associated with the given namespace are returned.
// If namespace is empty then visible package(s) across all namespaces are returned.
RetrieveAll(namespace string) ([]*OperatorMetadata, error)
// RetrieveOne retrieves a given package from the source
RetrieveOne(name, release string) (*OperatorMetadata, error)
// ListPackages returns metadata associated with each package in the
// specified namespace.
ListPackages(namespace string) ([]*RegistryMetadata, error)
}
type client struct {
adapter apprApiAdapter
decoder blobDecoder
}
func (c *client) RetrieveAll(namespace string) ([]*OperatorMetadata, error) {
packages, err := c.adapter.ListPackages(namespace)
if err != nil {
return nil, err
}
list := make([]*OperatorMetadata, len(packages))
for i, pkg := range packages {
manifest, err := c.RetrieveOne(pkg.Name, pkg.Default)
if err != nil {
return nil, err
}
list[i] = manifest
}
return list, nil
}
func (c *client) ListPackages(namespace string) ([]*RegistryMetadata, error) {
packages, err := c.adapter.ListPackages(namespace)
if err != nil {
return nil, err
}
list := make([]*RegistryMetadata, len(packages))
for i, pkg := range packages {
namespace, repository, err := split(pkg.Name)
if err != nil {
return nil, err
}
metadata := &RegistryMetadata{
Namespace: namespace,
Name: repository,
// 'Default' points to the latest release pushed.
Release: pkg.Default,
// Getting 'Digest' would require an additional call to the app
// registry, so it is being defaulted.
}
list[i] = metadata
}
return list, nil
}
func (c *client) RetrieveOne(name, release string) (*OperatorMetadata, error) {
namespace, repository, err := split(name)
if err != nil {
return nil, err
}
metadata, err := c.adapter.GetPackageMetadata(namespace, repository, release)
if err != nil {
return nil, err
}
digest := metadata.Content.Digest
blob, err := c.adapter.DownloadOperatorManifest(namespace, repository, digest)
if err != nil {
return nil, err
}
decoded, err := c.decoder.Decode(blob)
if err != nil {
return nil, err
}
om := &OperatorMetadata{
RegistryMetadata: RegistryMetadata{
Namespace: namespace,
Name: repository,
Release: release,
Digest: digest,
},
Blob: decoded,
}
return om, nil
}
func split(name string) (namespace string, repository string, err error) {
// we expect package name to comply to this format - {namespace}/{repository}
split := strings.Split(name, "/")
if len(split) != 2 {
return "", "", errors.New(fmt.Sprintf("package name should be specified in this format {namespace}/{repository}"))
}
namespace = split[0]
repository = split[1]
return namespace, repository, nil
}