Merge pull request #179 from testcontainers/feature/containerIP

Added ContainerIP to retrieve ip of container from primary network

container.go

@@ -2,9 +2,10 @@ package testcontainers
 
 import (
 	"context"
-	"github.com/docker/docker/api/types/container"
 	"io"
 
+	"github.com/docker/docker/api/types/container"
+
 	"github.com/docker/docker/pkg/archive"
 	"github.com/docker/go-connections/nat"
 	"github.com/pkg/errors"
@@ -45,6 +46,7 @@ type Container interface {
 	Networks(context.Context) ([]string, error)                  // get container networks
 	NetworkAliases(context.Context) (map[string][]string, error) // get container network aliases for a network
 	Exec(ctx context.Context, cmd []string) (int, error)
+	ContainerIP(context.Context) (string, error) // get container ip
 }
 
 // ImageBuildInfo defines what is needed to build an image

docker.go

@@ -243,6 +243,16 @@ func (c *DockerContainer) Networks(ctx context.Context) ([]string, error) {
 	return n, nil
 }
 
+// ContainerIP gets the IP address of the primary network within the container.
+func (c *DockerContainer) ContainerIP(ctx context.Context) (string, error) {
+	inspect, err := c.inspectContainer(ctx)
+	if err != nil {
+		return "", err
+	}
+
+	return inspect.NetworkSettings.IPAddress, nil
+}
+
 // NetworkAliases gets the aliases of the container for the networks it is attached to.
 func (c *DockerContainer) NetworkAliases(ctx context.Context) (map[string][]string, error) {
 	inspect, err := c.inspectContainer(ctx)

docker_test.go

@@ -546,6 +546,13 @@ func TestContainerCreation(t *testing.T) {
 	if resp.StatusCode != http.StatusOK {
 		t.Errorf("Expected status code %d. Got %d.", http.StatusOK, resp.StatusCode)
 	}
+	networkIP, err := nginxC.ContainerIP(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(networkIP) == 0 {
+		t.Errorf("Expected an IP address, got %v", networkIP)
+	}
 	networkAliases, err := nginxC.NetworkAliases(ctx)
 	if err != nil {
 		t.Fatal(err)