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import sys
import math

from datetime import datetime

from sentry_sdk.utils import (
    AnnotatedValue,
    capture_internal_exception,
    disable_capture_event,
    format_timestamp,
    safe_repr,
    strip_string,
)
from sentry_sdk._compat import (
    text_type,
    PY2,
    string_types,
    number_types,
    iteritems,
    binary_sequence_types,
)
from sentry_sdk._types import TYPE_CHECKING

if TYPE_CHECKING:
    from types import TracebackType

    from typing import Any
    from typing import Callable
    from typing import ContextManager
    from typing import Dict
    from typing import List
    from typing import Optional
    from typing import Type
    from typing import Union

    from sentry_sdk._types import NotImplementedType, Event

    Span = Dict[str, Any]

    ReprProcessor = Callable[[Any, Dict[str, Any]], Union[NotImplementedType, str]]
    Segment = Union[str, int]


if PY2:
    # Importing ABCs from collections is deprecated, and will stop working in 3.8
    # https://github.com/python/cpython/blob/master/Lib/collections/__init__.py#L49
    from collections import Mapping, Sequence, Set

    serializable_str_types = string_types + binary_sequence_types

else:
    # New in 3.3
    # https://docs.python.org/3/library/collections.abc.html
    from collections.abc import Mapping, Sequence, Set

    # Bytes are technically not strings in Python 3, but we can serialize them
    serializable_str_types = string_types + binary_sequence_types


# Maximum length of JSON-serialized event payloads that can be safely sent
# before the server may reject the event due to its size. This is not intended
# to reflect actual values defined server-side, but rather only be an upper
# bound for events sent by the SDK.
#
# Can be overwritten if wanting to send more bytes, e.g. with a custom server.
# When changing this, keep in mind that events may be a little bit larger than
# this value due to attached metadata, so keep the number conservative.
MAX_EVENT_BYTES = 10**6

# Maximum depth and breadth of databags. Excess data will be trimmed. If
# max_request_body_size is "always", request bodies won't be trimmed.
MAX_DATABAG_DEPTH = 5
MAX_DATABAG_BREADTH = 10
CYCLE_MARKER = "<cyclic>"


global_repr_processors = []  # type: List[ReprProcessor]


def add_global_repr_processor(processor):
    # type: (ReprProcessor) -> None
    global_repr_processors.append(processor)


class Memo(object):
    __slots__ = ("_ids", "_objs")

    def __init__(self):
        # type: () -> None
        self._ids = {}  # type: Dict[int, Any]
        self._objs = []  # type: List[Any]

    def memoize(self, obj):
        # type: (Any) -> ContextManager[bool]
        self._objs.append(obj)
        return self

    def __enter__(self):
        # type: () -> bool
        obj = self._objs[-1]
        if id(obj) in self._ids:
            return True
        else:
            self._ids[id(obj)] = obj
            return False

    def __exit__(
        self,
        ty,  # type: Optional[Type[BaseException]]
        value,  # type: Optional[BaseException]
        tb,  # type: Optional[TracebackType]
    ):
        # type: (...) -> None
        self._ids.pop(id(self._objs.pop()), None)


def serialize(event, **kwargs):
    # type: (Event, **Any) -> Event
    memo = Memo()
    path = []  # type: List[Segment]
    meta_stack = []  # type: List[Dict[str, Any]]

    keep_request_bodies = (
        kwargs.pop("max_request_body_size", None) == "always"
    )  # type: bool
    max_value_length = kwargs.pop("max_value_length", None)  # type: Optional[int]

    def _annotate(**meta):
        # type: (**Any) -> None
        while len(meta_stack) <= len(path):
            try:
                segment = path[len(meta_stack) - 1]
                node = meta_stack[-1].setdefault(text_type(segment), {})
            except IndexError:
                node = {}

            meta_stack.append(node)

        meta_stack[-1].setdefault("", {}).update(meta)

    def _should_repr_strings():
        # type: () -> Optional[bool]
        """
        By default non-serializable objects are going through
        safe_repr(). For certain places in the event (local vars) we
        want to repr() even things that are JSON-serializable to
        make their type more apparent. For example, it's useful to
        see the difference between a unicode-string and a bytestring
        when viewing a stacktrace.

        For container-types we still don't do anything different.
        Generally we just try to make the Sentry UI present exactly
        what a pretty-printed repr would look like.

        :returns: `True` if we are somewhere in frame variables, and `False` if
            we are in a position where we will never encounter frame variables
            when recursing (for example, we're in `event.extra`). `None` if we
            are not (yet) in frame variables, but might encounter them when
            recursing (e.g.  we're in `event.exception`)
        """
        try:
            p0 = path[0]
            if p0 == "stacktrace" and path[1] == "frames" and path[3] == "vars":
                return True

            if (
                p0 in ("threads", "exception")
                and path[1] == "values"
                and path[3] == "stacktrace"
                and path[4] == "frames"
                and path[6] == "vars"
            ):
                return True
        except IndexError:
            return None

        return False

    def _is_databag():
        # type: () -> Optional[bool]
        """
        A databag is any value that we need to trim.

        :returns: Works like `_should_repr_strings()`. `True` for "yes",
            `False` for :"no", `None` for "maybe soon".
        """
        try:
            rv = _should_repr_strings()
            if rv in (True, None):
                return rv

            is_request_body = _is_request_body()
            if is_request_body in (True, None):
                return is_request_body

            p0 = path[0]
            if p0 == "breadcrumbs" and path[1] == "values":
                path[2]
                return True

            if p0 == "extra":
                return True

        except IndexError:
            return None

        return False

    def _is_request_body():
        # type: () -> Optional[bool]
        try:
            if path[0] == "request" and path[1] == "data":
                return True
        except IndexError:
            return None

        return False

    def _serialize_node(
        obj,  # type: Any
        is_databag=None,  # type: Optional[bool]
        is_request_body=None,  # type: Optional[bool]
        should_repr_strings=None,  # type: Optional[bool]
        segment=None,  # type: Optional[Segment]
        remaining_breadth=None,  # type: Optional[Union[int, float]]
        remaining_depth=None,  # type: Optional[Union[int, float]]
    ):
        # type: (...) -> Any
        if segment is not None:
            path.append(segment)

        try:
            with memo.memoize(obj) as result:
                if result:
                    return CYCLE_MARKER

                return _serialize_node_impl(
                    obj,
                    is_databag=is_databag,
                    is_request_body=is_request_body,
                    should_repr_strings=should_repr_strings,
                    remaining_depth=remaining_depth,
                    remaining_breadth=remaining_breadth,
                )
        except BaseException:
            capture_internal_exception(sys.exc_info())

            if is_databag:
                return "<failed to serialize, use init(debug=True) to see error logs>"

            return None
        finally:
            if segment is not None:
                path.pop()
                del meta_stack[len(path) + 1 :]

    def _flatten_annotated(obj):
        # type: (Any) -> Any
        if isinstance(obj, AnnotatedValue):
            _annotate(**obj.metadata)
            obj = obj.value
        return obj

    def _serialize_node_impl(
        obj,
        is_databag,
        is_request_body,
        should_repr_strings,
        remaining_depth,
        remaining_breadth,
    ):
        # type: (Any, Optional[bool], Optional[bool], Optional[bool], Optional[Union[float, int]], Optional[Union[float, int]]) -> Any
        if isinstance(obj, AnnotatedValue):
            should_repr_strings = False
        if should_repr_strings is None:
            should_repr_strings = _should_repr_strings()

        if is_databag is None:
            is_databag = _is_databag()

        if is_request_body is None:
            is_request_body = _is_request_body()

        if is_databag:
            if is_request_body and keep_request_bodies:
                remaining_depth = float("inf")
                remaining_breadth = float("inf")
            else:
                if remaining_depth is None:
                    remaining_depth = MAX_DATABAG_DEPTH
                if remaining_breadth is None:
                    remaining_breadth = MAX_DATABAG_BREADTH

        obj = _flatten_annotated(obj)

        if remaining_depth is not None and remaining_depth <= 0:
            _annotate(rem=[["!limit", "x"]])
            if is_databag:
                return _flatten_annotated(
                    strip_string(safe_repr(obj), max_length=max_value_length)
                )
            return None

        if is_databag and global_repr_processors:
            hints = {"memo": memo, "remaining_depth": remaining_depth}
            for processor in global_repr_processors:
                result = processor(obj, hints)
                if result is not NotImplemented:
                    return _flatten_annotated(result)

        sentry_repr = getattr(type(obj), "__sentry_repr__", None)

        if obj is None or isinstance(obj, (bool, number_types)):
            if should_repr_strings or (
                isinstance(obj, float) and (math.isinf(obj) or math.isnan(obj))
            ):
                return safe_repr(obj)
            else:
                return obj

        elif callable(sentry_repr):
            return sentry_repr(obj)

        elif isinstance(obj, datetime):
            return (
                text_type(format_timestamp(obj))
                if not should_repr_strings
                else safe_repr(obj)
            )

        elif isinstance(obj, Mapping):
            # Create temporary copy here to avoid calling too much code that
            # might mutate our dictionary while we're still iterating over it.
            obj = dict(iteritems(obj))

            rv_dict = {}  # type: Dict[str, Any]
            i = 0

            for k, v in iteritems(obj):
                if remaining_breadth is not None and i >= remaining_breadth:
                    _annotate(len=len(obj))
                    break

                str_k = text_type(k)
                v = _serialize_node(
                    v,
                    segment=str_k,
                    should_repr_strings=should_repr_strings,
                    is_databag=is_databag,
                    is_request_body=is_request_body,
                    remaining_depth=remaining_depth - 1
                    if remaining_depth is not None
                    else None,
                    remaining_breadth=remaining_breadth,
                )
                rv_dict[str_k] = v
                i += 1

            return rv_dict

        elif not isinstance(obj, serializable_str_types) and isinstance(
            obj, (Set, Sequence)
        ):
            rv_list = []

            for i, v in enumerate(obj):
                if remaining_breadth is not None and i >= remaining_breadth:
                    _annotate(len=len(obj))
                    break

                rv_list.append(
                    _serialize_node(
                        v,
                        segment=i,
                        should_repr_strings=should_repr_strings,
                        is_databag=is_databag,
                        is_request_body=is_request_body,
                        remaining_depth=remaining_depth - 1
                        if remaining_depth is not None
                        else None,
                        remaining_breadth=remaining_breadth,
                    )
                )

            return rv_list

        if should_repr_strings:
            obj = safe_repr(obj)
        else:
            if isinstance(obj, bytes) or isinstance(obj, bytearray):
                obj = obj.decode("utf-8", "replace")

            if not isinstance(obj, string_types):
                obj = safe_repr(obj)

        is_span_description = (
            len(path) == 3 and path[0] == "spans" and path[-1] == "description"
        )
        if is_span_description:
            return obj

        return _flatten_annotated(strip_string(obj, max_length=max_value_length))

    #
    # Start of serialize() function
    #
    disable_capture_event.set(True)
    try:
        serialized_event = _serialize_node(event, **kwargs)
        if meta_stack and isinstance(serialized_event, dict):
            serialized_event["_meta"] = meta_stack[0]

        return serialized_event
    finally:
        disable_capture_event.set(False)