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: _json.py

# -*- test-case-name: twisted.logger.test.test_json -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
Tools for saving and loading log events in a structured format.
"""

import types

from constantly import NamedConstant
from json import dumps, loads
from uuid import UUID

from ._flatten import flattenEvent
from ._file import FileLogObserver
from ._levels import LogLevel
from ._logger import Logger

from twisted.python.compat import unicode, _PY3
from twisted.python.failure import Failure

log = Logger()

def failureAsJSON(failure):
    """
    Convert a failure to a JSON-serializable data structure.

@param failure: A failure to serialize.
    @type failure: L{Failure}

@return: a mapping of strings to ... stuff, mostly reminiscent of
        L{Failure.__getstate__}
    @rtype: L{dict}
    """
    return dict(
        failure.__getstate__(),
        type=dict(
            __module__=failure.type.__module__,
            __name__=failure.type.__name__,
        )
    )

def asBytes(obj):
    """
    On Python 2, we really need native strings in a variety of places;
    attribute names will sort of work in a __dict__, but they're subtly wrong;
    however, printing tracebacks relies on I/O to containers that only support
    bytes.  This function converts _all_ native strings within a
    JSON-deserialized object to bytes.

@param obj: An object to convert to bytes.
    @type obj: L{object}

@return: A string of UTF-8 bytes.
    @rtype: L{bytes}
    """
    if isinstance(obj, list):
        return map(asBytes, obj)
    elif isinstance(obj, dict):
        return dict((asBytes(k), asBytes(v)) for k, v in obj.items())
    elif isinstance(obj, unicode):
        return obj.encode("utf-8")
    else:
        return obj

def failureFromJSON(failureDict):
    """
    Load a L{Failure} from a dictionary deserialized from JSON.

@param failureDict: a JSON-deserialized object like one previously returned
        by L{failureAsJSON}.
    @type failureDict: L{dict} mapping L{unicode} to attributes

@return: L{Failure}
    @rtype: L{Failure}
    """
    # InstanceType() is only available in Python 2 and lower.
    # __new__ is only available on new-style classes.
    newFailure = getattr(Failure, "__new__", None)
    if newFailure is None:
        f = types.InstanceType(Failure)
    else:
        f = newFailure(Failure)

if not _PY3:
        # Python 2 needs the failure dictionary as purely bytes, not text
        failureDict = asBytes(failureDict)

typeInfo = failureDict["type"]
    failureDict["type"] = type(typeInfo["__name__"], (), typeInfo)
    f.__dict__ = failureDict
    return f

classInfo = [
    (
        lambda level: (
            isinstance(level, NamedConstant) and
            getattr(LogLevel, level.name, None) is level
        ),
        UUID("02E59486-F24D-46AD-8224-3ACDF2A5732A"),
        lambda level: dict(name=level.name),
        lambda level: getattr(LogLevel, level["name"], None)
    ),

(
        lambda o: isinstance(o, Failure),
        UUID("E76887E2-20ED-49BF-A8F8-BA25CC586F2D"),
        failureAsJSON, failureFromJSON
    ),
]

uuidToLoader = dict([
    (uuid, loader) for (predicate, uuid, saver, loader) in classInfo
])

def objectLoadHook(aDict):
    """
    Dictionary-to-object-translation hook for certain value types used within
    the logging system.

@see: the C{object_hook} parameter to L{json.load}

@param aDict: A dictionary loaded from a JSON object.
    @type aDict: L{dict}

@return: C{aDict} itself, or the object represented by C{aDict}
    @rtype: L{object}
    """
    if "__class_uuid__" in aDict:
        return uuidToLoader[UUID(aDict["__class_uuid__"])](aDict)
    return aDict

def objectSaveHook(pythonObject):
    """
    Object-to-serializable hook for certain value types used within the logging
    system.

@see: the C{default} parameter to L{json.dump}

@param pythonObject: Any object.
    @type pythonObject: L{object}

@return: If the object is one of the special types the logging system
        supports, a specially-formatted dictionary; otherwise, a marker
        dictionary indicating that it could not be serialized.
    """
    for (predicate, uuid, saver, loader) in classInfo:
        if predicate(pythonObject):
            result = saver(pythonObject)
            result["__class_uuid__"] = str(uuid)
            return result
    return {"unpersistable": True}

def eventAsJSON(event):
    """
    Encode an event as JSON, flattening it if necessary to preserve as much
    structure as possible.

Not all structure from the log event will be preserved when it is
    serialized.

@param event: A log event dictionary.
    @type event: L{dict} with arbitrary keys and values

@return: A string of the serialized JSON; note that this will contain no
        newline characters, and may thus safely be stored in a line-delimited
        file.
    @rtype: L{unicode}
    """
    if bytes is str:
        kw = dict(default=objectSaveHook, encoding="charmap", skipkeys=True)
    else:
        def default(unencodable):
            """
            Serialize an object not otherwise serializable by L{dumps}.

@param unencodable: An unencodable object.
            @return: C{unencodable}, serialized
            """
            if isinstance(unencodable, bytes):
                return unencodable.decode("charmap")
            return objectSaveHook(unencodable)

kw = dict(default=default, skipkeys=True)

flattenEvent(event)
    result = dumps(event, **kw)
    if not isinstance(result, unicode):
        return unicode(result, "utf-8", "replace")
    return result

def eventFromJSON(eventText):
    """
    Decode a log event from JSON.

@param eventText: The output of a previous call to L{eventAsJSON}
    @type eventText: L{unicode}

@return: A reconstructed version of the log event.
    @rtype: L{dict}
    """
    loaded = loads(eventText, object_hook=objectLoadHook)
    return loaded

def jsonFileLogObserver(outFile, recordSeparator=u"\x1e"):
    """
    Create a L{FileLogObserver} that emits JSON-serialized events to a
    specified (writable) file-like object.

Events are written in the following form::

RS + JSON + NL

C{JSON} is the serialized event, which is JSON text.  C{NL} is a newline
    (C{u"\\n"}).  C{RS} is a record separator.  By default, this is a single
    RS character (C{u"\\x1e"}), which makes the default output conform to the
    IETF draft document "draft-ietf-json-text-sequence-13".

@param outFile: A file-like object.  Ideally one should be passed which
        accepts L{unicode} data.  Otherwise, UTF-8 L{bytes} will be used.
    @type outFile: L{io.IOBase}

@param recordSeparator: The record separator to use.
    @type recordSeparator: L{unicode}

@return: A file log observer.
    @rtype: L{FileLogObserver}
    """
    return FileLogObserver(
        outFile,
        lambda event: u"{0}{1}\n".format(recordSeparator, eventAsJSON(event))
    )

def eventsFromJSONLogFile(inFile, recordSeparator=None, bufferSize=4096):
    """
    Load events from a file previously saved with L{jsonFileLogObserver}.
    Event records that are truncated or otherwise unreadable are ignored.

@param inFile: A (readable) file-like object.  Data read from C{inFile}
        should be L{unicode} or UTF-8 L{bytes}.
    @type inFile: iterable of lines

@param recordSeparator: The expected record separator.
        If L{None}, attempt to automatically detect the record separator from
        one of C{u"\\x1e"} or C{u""}.
    @type recordSeparator: L{unicode}

@param bufferSize: The size of the read buffer used while reading from
        C{inFile}.
    @type bufferSize: integer

@return: Log events as read from C{inFile}.
    @rtype: iterable of L{dict}
    """
    def asBytes(s):
        if type(s) is bytes:
            return s
        else:
            return s.encode("utf-8")

def eventFromBytearray(record):
        try:
            text = bytes(record).decode("utf-8")
        except UnicodeDecodeError:
            log.error(
                u"Unable to decode UTF-8 for JSON record: {record!r}",
                record=bytes(record)
            )
            return None

try:
            return eventFromJSON(text)
        except ValueError:
            log.error(
                u"Unable to read JSON record: {record!r}",
                record=bytes(record)
            )
            return None

if recordSeparator is None:
        first = asBytes(inFile.read(1))

if first == b"\x1e":
            # This looks json-text-sequence compliant.
            recordSeparator = first
        else:
            # Default to simpler newline-separated stream, which does not use
            # a record separator.
            recordSeparator = b""

else:
        recordSeparator = asBytes(recordSeparator)
        first = b""

if recordSeparator == b"":
        recordSeparator = b"\n"  # Split on newlines below

eventFromRecord = eventFromBytearray

else:
        def eventFromRecord(record):
            if record[-1] == ord("\n"):
                return eventFromBytearray(record)
            else:
                log.error(
                    u"Unable to read truncated JSON record: {record!r}",
                    record=bytes(record)
                )
            return None

buffer = bytearray(first)

while True:
        newData = inFile.read(bufferSize)

if not newData:
            if len(buffer) > 0:
                event = eventFromRecord(buffer)
                if event is not None:
                    yield event
            break

buffer += asBytes(newData)
        records = buffer.split(recordSeparator)

for record in records[:-1]:
            if len(record) > 0:
                event = eventFromRecord(record)
                if event is not None:
                    yield event

buffer = records[-1]

NAME	TYPE	LAST MODIFIED	SIZE	OWNER / GROUP	PERMISSIONS	ACTION
..
__init__.py	f!le	2018-09-09 7:52	3.16 KB	root / root	-rw-r--r--
_buffer.py	f!le	2018-07-24 19:14	1.45 KB	root / root	-rw-r--r--
_file.py	f!le	2018-07-24 19:14	2.43 KB	root / root	-rw-r--r--
_filter.py	f!le	2018-09-25 20:55	6.82 KB	root / root	-rw-r--r--
_flatten.py	f!le	2018-07-24 19:14	4.97 KB	root / root	-rw-r--r--
_format.py	f!le	2018-10-10 19:24	12.14 KB	root / root	-rw-r--r--
_global.py	f!le	2018-09-09 7:52	8.58 KB	root / root	-rw-r--r--
_io.py	f!le	2018-07-24 19:14	4.35 KB	root / root	-rw-r--r--
_json.py	f!le	2018-07-24 19:14	9.83 KB	root / root	-rw-r--r--
_legacy.py	f!le	2018-07-24 19:14	5.11 KB	root / root	-rw-r--r--
_levels.py	f!le	2018-07-24 19:14	3.68 KB	root / root	-rw-r--r--
_logger.py	f!le	2018-07-24 19:14	9.3 KB	root / root	-rw-r--r--
_observer.py	f!le	2018-07-24 19:14	4.87 KB	root / root	-rw-r--r--
_stdlib.py	f!le	2018-07-24 19:14	4.3 KB	root / root	-rw-r--r--
_util.py	f!le	2018-07-24 19:14	1.3 KB	root / root	-rw-r--r--

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