refactor: use pkg directory structure

pkg/client/connection.go

@@ -0,0 +1,45 @@
+package client
+
+import (
+	"github.com/docker/cli/cli/connhelper"
+	"github.com/docker/cli/cli/context/docker"
+	dCliContextStore "github.com/docker/cli/cli/context/store"
+	dClient "github.com/docker/docker/client"
+	"github.com/sirupsen/logrus"
+)
+
+func newConnectionHelper(daemonURL string) *connhelper.ConnectionHelper {
+	helper, err := connhelper.GetConnectionHelper(daemonURL)
+
+	if err != nil {
+		logrus.Fatal(err)
+	}
+	return helper
+}
+
+func getDockerEndpoint(host string) (docker.Endpoint, error) {
+	skipTLSVerify := false
+	ep := docker.Endpoint{
+		EndpointMeta: docker.EndpointMeta{
+			Host:          host,
+			SkipTLSVerify: skipTLSVerify,
+		},
+	}
+	// try to resolve a docker client, validating the configuration
+	opts, err := ep.ClientOpts()
+	if err != nil {
+		return docker.Endpoint{}, err
+	}
+	if _, err := dClient.NewClientWithOpts(opts...); err != nil {
+		return docker.Endpoint{}, err
+	}
+	return ep, nil
+}
+
+func getDockerEndpointMetadataAndTLS(host string) (docker.EndpointMeta, *dCliContextStore.EndpointTLSData, error) {
+	ep, err := getDockerEndpoint(host)
+	if err != nil {
+		return docker.EndpointMeta{}, nil, err
+	}
+	return ep.EndpointMeta, ep.TLSData.ToStoreTLSData(), nil
+}