Method get_port_range

library/python/port_manager/__init__.py:104–141

(self, start_port, count, random_start=True)

                    filelock.release()

    def get_port_range(self, start_port, count, random_start=True):
        assert count > 0
        if start_port and self._no_random_ports():
            return start_port

        candidates = []

        def drop_candidates():
            for port in candidates:
                self._release_port_no_lock(port)
            candidates[:] = []

        with self._lock:
            for attempts in six.moves.range(128):
                for left, right in self._valid_range:
                    if right - left < count:
                        continue

                    if random_start:
                        start = random.randint(left, right - ((right - left) // 2))
                    else:
                        start = left
                    for probe_port in six.moves.range(start, right):
                        if self._capture_port_no_lock(probe_port, socket.SOCK_STREAM):
                            candidates.append(probe_port)
                        else:
                            drop_candidates()

                        if len(candidates) == count:
                            return candidates[0]
                    # Can't find required number of ports without gap in the current range
                    drop_candidates()

            raise PortManagerException(
                "Failed to find valid port range (start_port: {} count: {}) (range: {} used: {})".format(
                    start_port, count, self._valid_range, self._filelocks
                )
            )

    def _count_valid_ports(self):
        res = 0