How to use the wrapt.importer function in wrapt

so that later subsegment can be attached. After each test run
    it cleans up context storage again.
    """
    pre_run_modules = set(module for module in sys.modules.keys())

    xray_recorder.configure(service='test', sampling=False, context=Context())
    xray_recorder.clear_trace_entities()
    xray_recorder.begin_segment('name')
    yield
    xray_recorder.end_segment()
    xray_recorder.clear_trace_entities()
    global_sdk_config.set_sdk_enabled(True)

    # Reload wrapt.importer references to modules to start off clean
    reload(wrapt)
    reload(wrapt.importer)
    # Reload patcher references to already patched modules
    reload(patcher)
    # Cleanup the already imported module references in the system
    for module_name, module in sorted(sys.modules.items(), key=lambda m: len(m[0]), reverse=True):
        if module_name not in pre_run_modules and inspect.ismodule(module):
            reload(module)

    for module_name in sorted(sys.modules.keys(), key=lambda m: len(m), reverse=True):
        if module_name not in pre_run_modules:
            del sys.modules[module_name]

for loader, submodule_name, is_module in pkgutil.iter_modules([module.replace('.', '/')]):
        submodule = '.'.join([module, submodule_name])
        if is_module:
            _external_module_patch(submodule, ignore_module_patterns)
        else:
            if submodule in _PATCHED_MODULES:
                log.debug('%s already patched', submodule)
                continue
            elif any(pattern.match(submodule) for pattern in ignore_module_patterns):
                log.debug('%s ignored due to rules: %s', submodule, ignore_module_patterns)
                continue

            if submodule in sys.modules:
                _on_import(sys.modules[submodule])
            else:
                wrapt.importer.when_imported(submodule)(_on_import)

            _PATCHED_MODULES.add(submodule)
            log.info('successfully patched module %s', submodule)

    if module not in _PATCHED_MODULES:
        _PATCHED_MODULES.add(module)
        log.info('successfully patched module %s', module)

def _external_module_patch(module, ignore_module_patterns):
    if module.startswith('.'):
        raise Exception('relative packages not supported for patching: {}'.format(module))

    if module in _PATCHED_MODULES:
        log.debug('%s already patched', module)
    elif any(pattern.match(module) for pattern in ignore_module_patterns):
        log.debug('%s ignored due to rules: %s', module, ignore_module_patterns)
    else:
        if module in sys.modules:
            _on_import(sys.modules[module])
        else:
            wrapt.importer.when_imported(module)(_on_import)

    for loader, submodule_name, is_module in pkgutil.iter_modules([module.replace('.', '/')]):
        submodule = '.'.join([module, submodule_name])
        if is_module:
            _external_module_patch(submodule, ignore_module_patterns)
        else:
            if submodule in _PATCHED_MODULES:
                log.debug('%s already patched', submodule)
                continue
            elif any(pattern.match(submodule) for pattern in ignore_module_patterns):
                log.debug('%s ignored due to rules: %s', submodule, ignore_module_patterns)
                continue

            if submodule in sys.modules:
                _on_import(sys.modules[submodule])
            else: