Add base cli and connection logic

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

client/client.go

@@ -27,21 +27,45 @@
 
 package client
 
-import "google.golang.org/grpc"
+import (
+	"context"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	v1 "github.com/docker/api/backend/v1"
+	"google.golang.org/grpc"
+)
+
+// NewContext is a context that is canceled when a signal is
+// sent to the process
+func NewContext() (context.Context, func()) {
+	ctx, cancel := context.WithCancel(context.Background())
+	s := make(chan os.Signal)
+	signal.Notify(s, syscall.SIGTERM, syscall.SIGINT)
+	go func() {
+		<-s
+		cancel()
+	}()
+	return ctx, cancel
+}
 
 // New returns a GRPC client
-func New(address string) (*Client, error) {
-	conn, err := grpc.Dial(address, grpc.WithInsecure())
+func New(address string, timeout time.Duration) (*Client, error) {
+	conn, err := grpc.Dial(address, grpc.WithInsecure(), grpc.WithBlock(), grpc.WithTimeout(timeout))
 	if err != nil {
 		return nil, err
 	}
 	return &Client{
-		conn: conn,
+		conn:          conn,
+		BackendClient: v1.NewBackendClient(conn),
 	}, nil
 }
 
 type Client struct {
 	conn *grpc.ClientConn
+	v1.BackendClient
 }
 
 func (c *Client) Close() error {