Function publicPort

dgraphtest/dgraph.go:393–424

(dcli *docker.Client, dc dnode, privatePort string)

}

func publicPort(dcli *docker.Client, dc dnode, privatePort string) (string, error) {
	// TODO(aman): we should cache the port information

	if runtime.GOOS == "darwin" {
		return getPortMappingsOnMac(dc.cid(), privatePort)
	}

	ctx, cancel := context.WithTimeout(context.Background(), requestTimeout)
	defer cancel()

	info, err := dcli.ContainerInspect(ctx, dc.cid())
	if err != nil {
		return "", errors.Wrap(err, "error inspecting container")
	}

	for port, bindings := range info.NetworkSettings.Ports {
		if len(bindings) == 0 {
			continue
		}
		if port.Port() != privatePort {
			continue
		}

		for _, binding := range bindings {
			if binding.HostIP == "0.0.0.0" {
				return binding.HostPort, nil
			}
		}
	}

	return "", fmt.Errorf("no mapping found for private port [%v] for container [%v]", privatePort, dc.cname())
}

// getPortMappingsOnMac parses `docker ps` output to get accurate macOS mappings
// because docker inspect does not know about port mappings at all.