rollbar/pyrollbar

import logging


from rollbar.lib import binary_type, string_types, circular_reference_label

# NOTE: Don't remove this line of code as it would cause a breaking change
# to the library's API. The items imported here were originally in this file
# but were moved to a new file for easier use elsewhere.
from rollbar.lib.type_info import (
    get_type,
    CIRCULAR,
    DEFAULT,
    MAPPING,
    TUPLE,
    NAMEDTUPLE,
    LIST,
    SET,
    STRING,
)


log = logging.getLogger(__name__)


def _noop_circular(a, **kw):
    return circular_reference_label(a, ref_key=kw.get("ref_key"))


def _noop(a, **_):
    return a


def _noop_tuple(a, **_):
    return tuple(a)


def _noop_namedtuple(a, **_):
    return a._make(a)


def _noop_list(a, **_):
    return list(a)


def _noop_set(a, **_):
    return set(a)


def _noop_mapping(a, **_):
    return dict(a)


_default_handlers = {
    CIRCULAR: _noop_circular,
    DEFAULT: _noop,
    STRING: _noop,
    TUPLE: _noop_tuple,
    NAMEDTUPLE: _noop_namedtuple,
    LIST: _noop_list,
    SET: _noop_set,
    MAPPING: _noop_mapping,
}


def traverse(
    obj,
    key=(),
    string_handler=_default_handlers[STRING],
    tuple_handler=_default_handlers[TUPLE],
    namedtuple_handler=_default_handlers[NAMEDTUPLE],
    list_handler=_default_handlers[LIST],
    set_handler=_default_handlers[SET],
    mapping_handler=_default_handlers[MAPPING],
    default_handler=_default_handlers[DEFAULT],
    circular_reference_handler=_default_handlers[CIRCULAR],
    allowed_circular_reference_types=None,
    memo=None,
    **custom_handlers
):
    memo = memo or {}
    obj_id = id(obj)
    obj_type = get_type(obj)

    ref_key = memo.get(obj_id)
    if ref_key:
        if not allowed_circular_reference_types or not isinstance(
            obj, allowed_circular_reference_types
        ):
            return circular_reference_handler(obj, key=key, ref_key=ref_key)

    memo[obj_id] = key

    kw = {
        "string_handler": string_handler,
        "tuple_handler": tuple_handler,
        "namedtuple_handler": namedtuple_handler,
        "list_handler": list_handler,
        "set_handler": set_handler,
        "mapping_handler": mapping_handler,
        "default_handler": default_handler,
        "circular_reference_handler": circular_reference_handler,
        "allowed_circular_reference_types": allowed_circular_reference_types,
        "memo": memo,
    }
    kw.update(custom_handlers)

    try:
        if obj_type is STRING:
            return string_handler(obj, key=key)
        elif obj_type is TUPLE:
            return tuple_handler(
                tuple(
                    traverse(elem, key=key + (i,), **kw) for i, elem in enumerate(obj)
                ),
                key=key,
            )
        elif obj_type is NAMEDTUPLE:
            return namedtuple_handler(
                obj._make(
                    traverse(v, key=key + (k,), **kw)
                    for k, v in obj._asdict().items()
                ),
                key=key,
            )
        elif obj_type is LIST:
            return list_handler(
                [traverse(elem, key=key + (i,), **kw) for i, elem in enumerate(obj)],
                key=key,
            )
        elif obj_type is SET:
            return set_handler(
                {traverse(elem, key=key + (i,), **kw) for i, elem in enumerate(obj)},
                key=key,
            )
        elif obj_type is MAPPING:
            return mapping_handler(
                {k: traverse(v, key=key + (k,), **kw) for k, v in obj.items()},
                key=key,
            )
        elif obj_type is DEFAULT:
            for handler_type, handler in custom_handlers.items():
                if isinstance(obj, handler_type):
                    return handler(obj, key=key)
    except:
        # use the default handler for unknown object types
        log.debug(
            "Exception while traversing object using type-specific "
            "handler. Switching to default handler.",
            exc_info=True,
        )

    return default_handler(obj, key=key)


__all__ = ["traverse"]