// GetDockerEnvIPv4 returns the IPv4 of a container within the network bridge
// of an environment.
func GetDockerEnvIPv4(
docker *dockerapi.Client, containerID, networkID string) (string, error) {
network, err := docker.NetworkInfo(networkID)
if err != nil {
return "", err
}
endpoint, ok := network.Containers[containerID]
if !ok {
return "", fmt.Errorf("Container not found")
}
return strings.Split(endpoint.IPv4Address, "/")[0], nil
}
// CreateDockerEnvNetwork creates the network bridge for an environment. Returns
// the network IPv4 of the bridge (useful for listening for connections from
// that bridge) as well as our own IPv4 on that network.
func CreateDockerEnvNetwork(
docker *dockerapi.Client, environment string) (
networkID string, networkIPv4 string, ownIPv4 string, err error) {
// Create.
networkName := getNetworkName(environment)
network, err := docker.CreateNetwork(dockerapi.CreateNetworkOptions{
Name: networkName,
Driver: "bridge",
CheckDuplicate: true,
})
if err != nil {
if strings.Contains(err.Error(), "already exists") {
// We already have this network. No need to create it.
network, err = docker.NetworkInfo(networkName)
if err != nil {
return "", "", "", err
}
} else {
return "", "", "", err
}
} else {
// Get more info.
network, err = docker.NetworkInfo(network.ID)
if err != nil {
return "", "", "", err
}
}
if len(network.IPAM.Config) == 0 {
return "", "", "", fmt.Errorf("Network has no config")
}
// Connect ourselves to the network.
ownIPv4, err = ConnectToDockerEnvNetwork(
docker, GetOwnContainerID(), network.ID)
if err != nil {
docker.RemoveNetwork(network.ID)
return "", "", "", err
}
networkIPv4 = strings.Split(network.IPAM.Config[0].Subnet, "/")[0]
return network.ID, networkIPv4, ownIPv4, nil
}