Function parseDockerIPv4Port

integration/e2e/service.go:711–730

parseDockerIPv4Port parses the input string which is expected to be the output of "docker port" command and returns the first IPv4 port found.

(out string)

// parseDockerIPv4Port parses the input string which is expected to be the output of "docker port"
// command and returns the first IPv4 port found.
func parseDockerIPv4Port(out string) (int, error) {
	// The "docker port" output may be multiple lines if both IPv4 and IPv6 are supported,
	// so we need to parse each line.
	for line := range strings.SplitSeq(out, "\n") {
		matches := dockerIPv4PortPattern.FindStringSubmatch(strings.TrimSpace(line))
		if len(matches) != 2 {
			continue
		}

		port, err := strconv.Atoi(matches[1])
		if err != nil {
			continue
		}

		return port, nil
	}

	// We've not been able to parse the output format.
	return 0, errors.New("unknown output format")
}