Move registry client to a dedicated package

pkg/kubernetes/client.go

@@ -0,0 +1,61 @@
+package kubernetes
+
+import (
+	"context"
+	"net/http"
+	"path/filepath"
+
+	"github.com/docker/docker/client"
+	"github.com/docker/go-connections/tlsconfig"
+	"github.com/pkg/errors"
+)
+
+// Client represents an active docker object
+type Client struct {
+	ctx context.Context
+	API *client.Client
+}
+
+// NewClient initializes a new Docker API client with default values
+func NewClient(endpoint, apiVersion, tlsCertsPath string, tlsVerify bool) (*Client, error) {
+	var opts []client.Opt
+	if endpoint != "" {
+		opts = append(opts, client.WithHost(endpoint))
+	}
+	if apiVersion != "" {
+		opts = append(opts, client.WithVersion(apiVersion))
+	}
+	if tlsCertsPath != "" {
+		options := tlsconfig.Options{
+			CAFile:             filepath.Join(tlsCertsPath, "ca.pem"),
+			CertFile:           filepath.Join(tlsCertsPath, "cert.pem"),
+			KeyFile:            filepath.Join(tlsCertsPath, "key.pem"),
+			InsecureSkipVerify: !tlsVerify,
+		}
+		tlsc, err := tlsconfig.Client(options)
+		if err != nil {
+			return nil, errors.Wrap(err, "failed to create tls config")
+		}
+		httpCli := &http.Client{
+			Transport:     &http.Transport{TLSClientConfig: tlsc},
+			CheckRedirect: client.CheckRedirect,
+		}
+		opts = append(opts, client.WithHTTPClient(httpCli))
+	}
+
+	cli, err := client.NewClientWithOpts(opts...)
+	if err != nil {
+		return nil, err
+	}
+
+	ctx := context.Background()
+	_, err = cli.ServerVersion(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Client{
+		ctx: ctx,
+		API: cli,
+	}, err
+}