Add Docker engines provider

pkg/docker/client.go

@@ -11,9 +11,13 @@ type Client struct {
 	Api *client.Client
 }
 
-// NewEnvClient initializes a new Docker API client based on environment variables
-func NewEnvClient() (*Client, error) {
-	d, err := client.NewClientWithOpts(client.FromEnv, client.WithVersion("1.12"))
+// NewClient initializes a new Docker API client with default values
+func NewClient(endpoint string, apiVersion string, caFile string, certFile string, keyFile string) (*Client, error) {
+	d, err := client.NewClientWithOpts(
+		client.WithHost(endpoint),
+		client.WithVersion(apiVersion),
+		client.WithTLSClientConfig(caFile, certFile, keyFile),
+	)
 	if err != nil {
 		return nil, err
 	}

pkg/docker/container.go

@@ -0,0 +1,30 @@
+package docker
+
+import (
+	"context"
+	"sort"
+
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/filters"
+)
+
+// ContainerOptions holds docker container object options
+type ContainerOptions struct {
+	IncludeStopped bool
+}
+
+// ContainerList return container list.
+func (c *Client) ContainerList(filterArgs ...filters.KeyValuePair) ([]types.Container, error) {
+	containers, err := c.Api.ContainerList(context.Background(), types.ContainerListOptions{
+		Filters: filters.NewArgs(filterArgs...),
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	sort.Slice(containers, func(i, j int) bool {
+		return containers[i].Image < containers[j].Image
+	})
+
+	return containers, nil
+}