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"""Fallback pure Python implementation of msgpack"""
import
sys
import
struct
import
warnings
if
sys
.
version_info
[
0
]
==
3
:
PY3
=
True
int_types
=
int
Unicode
=
str
xrange
=
range
def
dict_iteritems
(
d
):
return
d
.
items
()
else
:
PY3
=
False
int_types
=
(
int
,
long
)
Unicode
=
unicode
def
dict_iteritems
(
d
):
return
d
.
iteritems
()
if
hasattr
(
sys
,
'pypy_version_info'
):
# cStringIO is slow on PyPy, StringIO is faster. However: PyPy's own
# StringBuilder is fastest.
from
__pypy__
import
newlist_hint
try
:
from
__pypy__
.
builders
import
BytesBuilder
as
StringBuilder
except
ImportError
:
from
__pypy__
.
builders
import
StringBuilder
USING_STRINGBUILDER
=
True
class
StringIO
(
object
):
def
__init__
(
self
,
s
=
b''
):
if
s
:
self
.
builder
=
StringBuilder
(
len
(
s
))
self
.
builder
.
append
(
s
)
else
:
self
.
builder
=
StringBuilder
()
def
write
(
self
,
s
):
if
isinstance
(
s
,
memoryview
):
s
=
s
.
tobytes
()
self
.
builder
.
append
(
s
)
def
getvalue
(
self
):
return
self
.
builder
.
build
()
else
:
USING_STRINGBUILDER
=
False
from
io
import
BytesIO
as
StringIO
newlist_hint
=
lambda
size
: []
from
msgpack
.
exceptions
import
(
BufferFull
,
OutOfData
,
UnpackValueError
,
PackValueError
,
PackOverflowError
,
ExtraData
)
from
msgpack
import
ExtType
EX_SKIP
=
0
EX_CONSTRUCT
=
1
EX_READ_ARRAY_HEADER
=
2
EX_READ_MAP_HEADER
=
3
TYPE_IMMEDIATE
=
0
TYPE_ARRAY
=
1
TYPE_MAP
=
2
TYPE_RAW
=
3
TYPE_BIN
=
4
TYPE_EXT
=
5
DEFAULT_RECURSE_LIMIT
=
511
def
_check_type_strict
(
obj
,
t
,
type
=
type
,
tuple
=
tuple
):
if
type
(
t
)
is
tuple
:
return
type
(
obj
)
in
t
else
:
return
type
(
obj
)
is
t
def
_get_data_from_buffer
(
obj
):
try
:
view
=
memoryview
(
obj
)
except
TypeError
:
# try to use legacy buffer protocol if 2.7, otherwise re-raise
if
not
PY3
:
view
=
memoryview
(
buffer
(
obj
))
warnings
.
warn
(
"using old buffer interface to unpack %s; "
"this leads to unpacking errors if slicing is used and "
"will be removed in a future version"
%
type
(
obj
),
RuntimeWarning
)
else
:
raise
if
view
.
itemsize
!=
1
:
raise
ValueError
(
"cannot unpack from multi-byte object"
)
return
view
def
unpack
(
stream
,
**
kwargs
):
"""
Unpack an object from `stream`.
Raises `ExtraData` when `packed` contains extra bytes.
See :class:`Unpacker` for options.
"""
data
=
stream
.
read
()
return
unpackb
(
data
,
**
kwargs
)
def
unpackb
(
packed
,
**
kwargs
):
"""
Unpack an object from `packed`.
Raises `ExtraData` when `packed` contains extra bytes.
See :class:`Unpacker` for options.
"""
unpacker
=
Unpacker
(
None
,
**
kwargs
)
unpacker
.
feed
(
packed
)
try
:
ret
=
unpacker
.
_unpack
()
except
OutOfData
:
raise
UnpackValueError
(
"Data is not enough."
)
if
unpacker
.
_got_extradata
():
raise
ExtraData
(
ret
,
unpacker
.
_get_extradata
())
return
ret
class
Unpacker
(
object
):
"""Streaming unpacker.
arguments:
:param file_like:
File-like object having `.read(n)` method.
If specified, unpacker reads serialized data from it and :meth:`feed()` is not usable.
:param int read_size:
Used as `file_like.read(read_size)`. (default: `min(16*1024, max_buffer_size)`)
:param bool use_list:
If true, unpack msgpack array to Python list.
Otherwise, unpack to Python tuple. (default: True)
:param callable object_hook:
When specified, it should be callable.
Unpacker calls it with a dict argument after unpacking msgpack map.
(See also simplejson)
:param callable object_pairs_hook:
When specified, it should be callable.
Unpacker calls it with a list of key-value pairs after unpacking msgpack map.
(See also simplejson)
:param str encoding:
Encoding used for decoding msgpack raw.
If it is None (default), msgpack raw is deserialized to Python bytes.
:param str unicode_errors:
Used for decoding msgpack raw with *encoding*.
(default: `'strict'`)
:param int max_buffer_size:
Limits size of data waiting unpacked. 0 means system's INT_MAX (default).
Raises `BufferFull` exception when it is insufficient.
You shoud set this parameter when unpacking data from untrusted source.
:param int max_str_len:
Limits max length of str. (default: 2**31-1)
:param int max_bin_len:
Limits max length of bin. (default: 2**31-1)
:param int max_array_len:
Limits max length of array. (default: 2**31-1)
:param int max_map_len:
Limits max length of map. (default: 2**31-1)
example of streaming deserialize from file-like object::
unpacker = Unpacker(file_like)
for o in unpacker:
process(o)
example of streaming deserialize from socket::
unpacker = Unpacker()
while True:
buf = sock.recv(1024**2)
if not buf:
break
unpacker.feed(buf)
for o in unpacker:
process(o)
"""
def
__init__
(
self
,
file_like
=
None
,
read_size
=
0
,
use_list
=
True
,
object_hook
=
None
,
object_pairs_hook
=
None
,
list_hook
=
None
,
encoding
=
None
,
unicode_errors
=
'strict'
,
max_buffer_size
=
0
,
ext_hook
=
ExtType
,
max_str_len
=
2147483647
,
# 2**32-1
max_bin_len
=
2147483647
,
max_array_len
=
2147483647
,
max_map_len
=
2147483647
,
max_ext_len
=
2147483647
):
if
file_like
is
None
:
self
.
_feeding
=
True
else
:
if
not
callable
(
file_like
.
read
):
raise
TypeError
(
"`file_like.read` must be callable"
)
self
.
file_like
=
file_like
self
.
_feeding
=
False
#: array of bytes feeded.
self
.
_buffer
=
bytearray
()
#: Which position we currently reads
self
.
_buff_i
=
0
# When Unpacker is used as an iterable, between the calls to next(),
# the buffer is not "consumed" completely, for efficiency sake.
# Instead, it is done sloppily. To make sure we raise BufferFull at
# the correct moments, we have to keep track of how sloppy we were.
# Furthermore, when the buffer is incomplete (that is: in the case
# we raise an OutOfData) we need to rollback the buffer to the correct
# state, which _buf_checkpoint records.
self
.
_buf_checkpoint
=
0
self
.
_max_buffer_size
=
max_buffer_size
or
2
**
31
-
1
if
read_size
>
self
.
_max_buffer_size
:
raise
ValueError
(
"read_size must be smaller than max_buffer_size"
)
self
.
_read_size
=
read_size
or
min
(
self
.
_max_buffer_size
,
16
*
1024
)
self
.
_encoding
=
encoding
self
.
_unicode_errors
=
unicode_errors
self
.
_use_list
=
use_list
self
.
_list_hook
=
list_hook
self
.
_object_hook
=
object_hook
self
.
_object_pairs_hook
=
object_pairs_hook
self
.
_ext_hook
=
ext_hook
self
.
_max_str_len
=
max_str_len
self
.
_max_bin_len
=
max_bin_len
self
.
_max_array_len
=
max_array_len
self
.
_max_map_len
=
max_map_len
self
.
_max_ext_len
=
max_ext_len
if
list_hook
is
not
None
and
not
callable
(
list_hook
):
raise
TypeError
(
'`list_hook` is not callable'
)
if
object_hook
is
not
None
and
not
callable
(
object_hook
):
raise
TypeError
(
'`object_hook` is not callable'
)
if
object_pairs_hook
is
not
None
and
not
callable
(
object_pairs_hook
):
raise
TypeError
(
'`object_pairs_hook` is not callable'
)
if
object_hook
is
not
None
and
object_pairs_hook
is
not
None
:
raise
TypeError
(
"object_pairs_hook and object_hook are mutually "
"exclusive"
)
if
not
callable
(
ext_hook
):
raise
TypeError
(
"`ext_hook` is not callable"
)
def
feed
(
self
,
next_bytes
):
assert
self
.
_feeding
view
=
_get_data_from_buffer
(
next_bytes
)
if
(
len
(
self
.
_buffer
)
-
self
.
_buff_i
+
len
(
view
)
>
self
.
_max_buffer_size
):
raise
BufferFull
self
.
_buffer
+=
view
def
_consume
(
self
):
""" Gets rid of the used parts of the buffer. """
self
.
_buf_checkpoint
=
self
.
_buff_i
def
_got_extradata
(
self
):
return
self
.
_buff_i
<
len
(
self
.
_buffer
)
def
_get_extradata
(
self
):
return
self
.
_buffer
[
self
.
_buff_i
:]
def
read_bytes
(
self
,
n
):
return
self
.
_read
(
n
)
def
_read
(
self
,
n
):
# (int) -> bytearray
self
.
_reserve
(
n
)
i
=
self
.
_buff_i
self
.
_buff_i
=
i
+
n
return
self
.
_buffer
[
i
:
i
+
n
]
def
_reserve
(
self
,
n
):
remain_bytes
=
len
(
self
.
_buffer
)
-
self
.
_buff_i
-
n
# Fast path: buffer has n bytes already
if
remain_bytes
>=
0
:
return
if
self
.
_feeding
:
self
.
_buff_i
=
self
.
_buf_checkpoint
raise
OutOfData
# Strip buffer before checkpoint before reading file.
if
self
.
_buf_checkpoint
>
0
:
del
self
.
_buffer
[:
self
.
_buf_checkpoint
]
self
.
_buff_i
-=
self
.
_buf_checkpoint
self
.
_buf_checkpoint
=
0
# Read from file
remain_bytes
=
-
remain_bytes
while
remain_bytes
>
0
:
to_read_bytes
=
max
(
self
.
_read_size
,
remain_bytes
)
read_data
=
self
.
file_like
.
read
(
to_read_bytes
)
if
not
read_data
:
break
assert
isinstance
(
read_data
,
bytes
)
self
.
_buffer
+=
read_data
remain_bytes
-=
len
(
read_data
)
if
len
(
self
.
_buffer
)
<
n
+
self
.
_buff_i
:
self
.
_buff_i
=
0
# rollback
raise
OutOfData
def
_read_header
(
self
,
execute
=
EX_CONSTRUCT
):
typ
=
TYPE_IMMEDIATE
n
=
0
obj
=
None
self
.
_reserve
(
1
)
b
=
self
.
_buffer
[
self
.
_buff_i
]
self
.
_buff_i
+=
1
if
b
&
0b10000000
==
0
:
obj
=
b
elif
b
&
0b11100000
==
0b11100000
:
obj
=
-
1
-
(
b
^
0xff
)
elif
b
&
0b11100000
==
0b10100000
:
n
=
b
&
0b00011111
typ
=
TYPE_RAW
if
n
>
self
.
_max_str_len
:
raise
UnpackValueError
(
"%s exceeds max_str_len(%s)"
,
n
,
self
.
_max_str_len
)
obj
=
self
.
_read
(
n
)
elif
b
&
0b11110000
==
0b10010000
:
n
=
b
&
0b00001111
typ
=
TYPE_ARRAY
if
n
>
self
.
_max_array_len
:
raise
UnpackValueError
(
"%s exceeds max_array_len(%s)"
,
n
,
self
.
_max_array_len
)
elif
b
&
0b11110000
==
0b10000000
:
n
=
b
&
0b00001111
typ
=
TYPE_MAP
if
n
>
self
.
_max_map_len
:
raise
UnpackValueError
(
"%s exceeds max_map_len(%s)"
,
n
,
self
.
_max_map_len
)
elif
b
==
0xc0
:
obj
=
None
elif
b
==
0xc2
:
obj
=
False
elif
b
==
0xc3
:
obj
=
True
elif
b
==
0xc4
:
typ
=
TYPE_BIN
self
.
_reserve
(
1
)
n
=
self
.
_buffer
[
self
.
_buff_i
]
self
.
_buff_i
+=
1
if
n
>
self
.
_max_bin_len
:
raise
UnpackValueError
(
"%s exceeds max_bin_len(%s)"
%
(
n
,
self
.
_max_bin_len
))
obj
=
self
.
_read
(
n
)
elif
b
==
0xc5
:
typ
=
TYPE_BIN
self
.
_reserve
(
2
)
n
=
struct
.
unpack_from
(
">H"
,
self
.
_buffer
,
self
.
_buff_i
)[
0
]
self
.
_buff_i
+=
2
if
n
>
self
.
_max_bin_len
:
raise
UnpackValueError
(
"%s exceeds max_bin_len(%s)"
%
(
n
,
self
.
_max_bin_len
))
obj
=
self
.
_read
(
n
)
elif
b
==
0xc6
:
typ
=
TYPE_BIN
self
.
_reserve
(
4
)
n
=
struct
.
unpack_from
(
">I"
,
self
.
_buffer
,
self
.
_buff_i
)[
0
]
self
.
_buff_i
+=
4
if
n
>
self
.
_max_bin_len
:
raise
UnpackValueError
(
"%s exceeds max_bin_len(%s)"
%
(
n
,
self
.
_max_bin_len
))
obj
=
self
.
_read
(
n
)
elif
b
==
0xc7
:
# ext 8
typ
=
TYPE_EXT
self
.
_reserve
(
2
)
L
,
n
=
struct
.
unpack_from
(
'Bb'
,
self
.
_buffer
,
self
.
_buff_i
)
self
.
_buff_i
+=
2
if
L
>
self
.
_max_ext_len
:
raise
UnpackValueError
(
"%s exceeds max_ext_len(%s)"
%
(
L
,
self
.
_max_ext_len
))
obj
=
self
.
_read
(
L
)
elif
b
==
0xc8
:
# ext 16
typ
=
TYPE_EXT
self
.
_reserve
(
3
)
L
,
n
=
struct
.
unpack_from
(
'>Hb'
,
self
.
_buffer
,
self
.
_buff_i
)
self
.
_buff_i
+=
3
if
L
>
self
.
_max_ext_len
:
raise
UnpackValueError
(
"%s exceeds max_ext_len(%s)"
%
(
L
,
self
.
_max_ext_len
))
obj
=
self
.
_read
(
L
)
elif
b
==
0xc9
:
# ext 32
typ
=
TYPE_EXT
self
.
_reserve
(
5
)
L
,
n
=
struct
.
unpack_from
(
'>Ib'
,
self
.
_buffer
,
self
.
_buff_i
)
self
.
_buff_i
+=
5
if
L
>
self
.
_max_ext_len
:
raise
UnpackValueError
(
"%s exceeds max_ext_len(%s)"
%
(
L
,
self
.
_max_ext_len
))
obj
=
self
.
_read
(
L
)
elif
b
==
0xca
:
self
.
_reserve
(
4
)
obj
=
struct
.
unpack_from
(
">f"
,
self
.
_buffer
,
self
.
_buff_i
)[
0
]
self
.
_buff_i
+=
4
elif
b
==
0xcb
:
self
.
_reserve
(
8
)
obj
=
struct
.
unpack_from
(
">d"
,
self
.
_buffer
,
self
.
_buff_i
)[
0
]
self
.
_buff_i
+=
8
elif
b
==
0xcc
:
self
.
_reserve
(
1
)
obj
=
self
.
_buffer
[
self
.
_buff_i
]
self
.
_buff_i
+=
1
elif
b
==
0xcd
:
self
.
_reserve
(
2
)
obj
=
struct
.
unpack_from
(
">H"
,
self
.
_buffer
,
self
.
_buff_i
)[
0
]
self
.
_buff_i
+=
2
elif
b
==
0xce
:
self
.
_reserve
(
4
)
obj
=
struct
.
unpack_from
(
">I"
,
self
.
_buffer
,
self
.
_buff_i
)[
0
]
self
.
_buff_i
+=
4
elif
b
==
0xcf
:
self
.
_reserve
(
8
)
obj
=
struct
.
unpack_from
(
">Q"
,
self
.
_buffer
,
self
.
_buff_i
)[
0
]
self
.
_buff_i
+=
8
elif
b
==
0xd0
:
self
.
_reserve
(
1
)
obj
=
struct
.
unpack_from
(
"b"
,
self
.
_buffer
,
self
.
_buff_i
)[
0
]
self
.
_buff_i
+=
1
elif
b
==
0xd1
:
self
.
_reserve
(
2
)
obj
=
struct
.
unpack_from
(
">h"
,
self
.
_buffer
,
self
.
_buff_i
)[
0
]
self
.
_buff_i
+=
2
elif
b
==
0xd2
:
self
.
_reserve
(
4
)
obj
=
struct
.
unpack_from
(
">i"
,
self
.
_buffer
,
self
.
_buff_i
)[
0
]
self
.
_buff_i
+=
4
elif
b
==
0xd3
:
self
.
_reserve
(
8
)
obj
=
struct
.
unpack_from
(
">q"
,
self
.
_buffer
,
self
.
_buff_i
)[
0
]
self
.
_buff_i
+=
8
elif
b
==
0xd4
:
# fixext 1
typ
=
TYPE_EXT
if
self
.
_max_ext_len
<
1
:
raise
UnpackValueError
(
"%s exceeds max_ext_len(%s)"
%
(
1
,
self
.
_max_ext_len
))
self
.
_reserve
(
2
)
n
,
obj
=
struct
.
unpack_from
(
"b1s"
,
self
.
_buffer
,
self
.
_buff_i
)
self
.
_buff_i
+=
2
elif
b
==
0xd5
:
# fixext 2
typ
=
TYPE_EXT
if
self
.
_max_ext_len
<
2
:
raise
UnpackValueError
(
"%s exceeds max_ext_len(%s)"
%
(
2
,
self
.
_max_ext_len
))
self
.
_reserve
(
3
)
n
,
obj
=
struct
.
unpack_from
(
"b2s"
,
self
.
_buffer
,
self
.
_buff_i
)
self
.
_buff_i
+=
3
elif
b
==
0xd6
:
# fixext 4
typ
=
TYPE_EXT
if
self
.
_max_ext_len
<
4
:
raise
UnpackValueError
(
"%s exceeds max_ext_len(%s)"
%
(
4
,
self
.
_max_ext_len
))
self
.
_reserve
(
5
)
n
,
obj
=
struct
.
unpack_from
(
"b4s"
,
self
.
_buffer
,
self
.
_buff_i
)
self
.
_buff_i
+=
5
elif
b
==
0xd7
:
# fixext 8
typ
=
TYPE_EXT
if
self
.
_max_ext_len
<
8
:
raise
UnpackValueError
(
"%s exceeds max_ext_len(%s)"
%
(
8
,
self
.
_max_ext_len
))
self
.
_reserve
(
9
)
n
,
obj
=
struct
.
unpack_from
(
"b8s"
,
self
.
_buffer
,
self
.
_buff_i
)
self
.
_buff_i
+=
9
elif
b
==
0xd8
:
# fixext 16
typ
=
TYPE_EXT
if
self
.
_max_ext_len
<
16
:
raise
UnpackValueError
(
"%s exceeds max_ext_len(%s)"
%
(
16
,
self
.
_max_ext_len
))
self
.
_reserve
(
17
)
n
,
obj
=
struct
.
unpack_from
(
"b16s"
,
self
.
_buffer
,
self
.
_buff_i
)
self
.
_buff_i
+=
17
elif
b
==
0xd9
:
typ
=
TYPE_RAW
self
.
_reserve
(
1
)
n
=
self
.
_buffer
[
self
.
_buff_i
]
self
.
_buff_i
+=
1
if
n
>
self
.
_max_str_len
:
raise
UnpackValueError
(
"%s exceeds max_str_len(%s)"
,
n
,
self
.
_max_str_len
)
obj
=
self
.
_read
(
n
)
elif
b
==
0xda
:
typ
=
TYPE_RAW
self
.
_reserve
(
2
)
n
,
=
struct
.
unpack_from
(
">H"
,
self
.
_buffer
,
self
.
_buff_i
)
self
.
_buff_i
+=
2
if
n
>
self
.
_max_str_len
:
raise
UnpackValueError
(
"%s exceeds max_str_len(%s)"
,
n
,
self
.
_max_str_len
)
obj
=
self
.
_read
(
n
)
elif
b
==
0xdb
:
typ
=
TYPE_RAW
self
.
_reserve
(
4
)
n
,
=
struct
.
unpack_from
(
">I"
,
self
.
_buffer
,
self
.
_buff_i
)
self
.
_buff_i
+=
4
if
n
>
self
.
_max_str_len
:
raise
UnpackValueError
(
"%s exceeds max_str_len(%s)"
,
n
,
self
.
_max_str_len
)
obj
=
self
.
_read
(
n
)
elif
b
==
0xdc
:
typ
=
TYPE_ARRAY
self
.
_reserve
(
2
)
n
,
=
struct
.
unpack_from
(
">H"
,
self
.
_buffer
,
self
.
_buff_i
)
self
.
_buff_i
+=
2
if
n
>
self
.
_max_array_len
:
raise
UnpackValueError
(
"%s exceeds max_array_len(%s)"
,
n
,
self
.
_max_array_len
)
elif
b
==
0xdd
:
typ
=
TYPE_ARRAY
self
.
_reserve
(
4
)
n
,
=
struct
.
unpack_from
(
">I"
,
self
.
_buffer
,
self
.
_buff_i
)
self
.
_buff_i
+=
4
if
n
>
self
.
_max_array_len
:
raise
UnpackValueError
(
"%s exceeds max_array_len(%s)"
,
n
,
self
.
_max_array_len
)
elif
b
==
0xde
:
self
.
_reserve
(
2
)
n
,
=
struct
.
unpack_from
(
">H"
,
self
.
_buffer
,
self
.
_buff_i
)
self
.
_buff_i
+=
2
if
n
>
self
.
_max_map_len
:
raise
UnpackValueError
(
"%s exceeds max_map_len(%s)"
,
n
,
self
.
_max_map_len
)
typ
=
TYPE_MAP
elif
b
==
0xdf
:
self
.
_reserve
(
4
)
n
,
=
struct
.
unpack_from
(
">I"
,
self
.
_buffer
,
self
.
_buff_i
)
self
.
_buff_i
+=
4
if
n
>
self
.
_max_map_len
:
raise
UnpackValueError
(
"%s exceeds max_map_len(%s)"
,
n
,
self
.
_max_map_len
)
typ
=
TYPE_MAP
else
:
raise
UnpackValueError
(
"Unknown header: 0x%x"
%
b
)
return
typ
,
n
,
obj
def
_unpack
(
self
,
execute
=
EX_CONSTRUCT
):
typ
,
n
,
obj
=
self
.
_read_header
(
execute
)
if
execute
==
EX_READ_ARRAY_HEADER
:
if
typ
!=
TYPE_ARRAY
:
raise
UnpackValueError
(
"Expected array"
)
return
n
if
execute
==
EX_READ_MAP_HEADER
:
if
typ
!=
TYPE_MAP
:
raise
UnpackValueError
(
"Expected map"
)
return
n
# TODO should we eliminate the recursion?
if
typ
==
TYPE_ARRAY
:
if
execute
==
EX_SKIP
:
for
i
in
xrange
(
n
):
# TODO check whether we need to call `list_hook`
self
.
_unpack
(
EX_SKIP
)
return
ret
=
newlist_hint
(
n
)
for
i
in
xrange
(
n
):
ret
.
append
(
self
.
_unpack
(
EX_CONSTRUCT
))
if
self
.
_list_hook
is
not
None
:
ret
=
self
.
_list_hook
(
ret
)
# TODO is the interaction between `list_hook` and `use_list` ok?
return
ret
if
self
.
_use_list
else
tuple
(
ret
)
if
typ
==
TYPE_MAP
:
if
execute
==
EX_SKIP
:
for
i
in
xrange
(
n
):
# TODO check whether we need to call hooks
self
.
_unpack
(
EX_SKIP
)
self
.
_unpack
(
EX_SKIP
)
return
if
self
.
_object_pairs_hook
is
not
None
:
ret
=
self
.
_object_pairs_hook
(
(
self
.
_unpack
(
EX_CONSTRUCT
),
self
.
_unpack
(
EX_CONSTRUCT
))
for
_
in
xrange
(
n
))
else
:
ret
=
{}
for
_
in
xrange
(
n
):
key
=
self
.
_unpack
(
EX_CONSTRUCT
)
ret
[
key
]
=
self
.
_unpack
(
EX_CONSTRUCT
)
if
self
.
_object_hook
is
not
None
:
ret
=
self
.
_object_hook
(
ret
)
return
ret
if
execute
==
EX_SKIP
:
return
if
typ
==
TYPE_RAW
:
if
self
.
_encoding
is
not
None
:
obj
=
obj
.
decode
(
self
.
_encoding
,
self
.
_unicode_errors
)
else
:
obj
=
bytes
(
obj
)
return
obj
if
typ
==
TYPE_EXT
:
return
self
.
_ext_hook
(
n
,
bytes
(
obj
))
if
typ
==
TYPE_BIN
:
return
bytes
(
obj
)
assert
typ
==
TYPE_IMMEDIATE
return
obj
def
__iter__
(
self
):
return
self
def
__next__
(
self
):
try
:
ret
=
self
.
_unpack
(
EX_CONSTRUCT
)
self
.
_consume
()
return
ret
except
OutOfData
:
self
.
_consume
()
raise
StopIteration
next
=
__next__
def
skip
(
self
,
write_bytes
=
None
):
self
.
_unpack
(
EX_SKIP
)
if
write_bytes
is
not
None
:
write_bytes
(
self
.
_buffer
[
self
.
_buf_checkpoint
:
self
.
_buff_i
])
self
.
_consume
()
def
unpack
(
self
,
write_bytes
=
None
):
ret
=
self
.
_unpack
(
EX_CONSTRUCT
)
if
write_bytes
is
not
None
:
write_bytes
(
self
.
_buffer
[
self
.
_buf_checkpoint
:
self
.
_buff_i
])
self
.
_consume
()
return
ret
def
read_array_header
(
self
,
write_bytes
=
None
):
ret
=
self
.
_unpack
(
EX_READ_ARRAY_HEADER
)
if
write_bytes
is
not
None
:
write_bytes
(
self
.
_buffer
[
self
.
_buf_checkpoint
:
self
.
_buff_i
])
self
.
_consume
()
return
ret
def
read_map_header
(
self
,
write_bytes
=
None
):
ret
=
self
.
_unpack
(
EX_READ_MAP_HEADER
)
if
write_bytes
is
not
None
:
write_bytes
(
self
.
_buffer
[
self
.
_buf_checkpoint
:
self
.
_buff_i
])
self
.
_consume
()
return
ret
class
Packer
(
object
):
"""
MessagePack Packer
usage:
packer = Packer()
astream.write(packer.pack(a))
astream.write(packer.pack(b))
Packer's constructor has some keyword arguments:
:param callable default:
Convert user type to builtin type that Packer supports.
See also simplejson's document.
:param str encoding:
Convert unicode to bytes with this encoding. (default: 'utf-8')
:param str unicode_errors:
Error handler for encoding unicode. (default: 'strict')
:param bool use_single_float:
Use single precision float type for float. (default: False)
:param bool autoreset:
Reset buffer after each pack and return it's content as `bytes`. (default: True).
If set this to false, use `bytes()` to get content and `.reset()` to clear buffer.
:param bool use_bin_type:
Use bin type introduced in msgpack spec 2.0 for bytes.
It also enable str8 type for unicode.
:param bool strict_types:
If set to true, types will be checked to be exact. Derived classes
from serializeable types will not be serialized and will be
treated as unsupported type and forwarded to default.
Additionally tuples will not be serialized as lists.
This is useful when trying to implement accurate serialization
for python types.
"""
def
__init__
(
self
,
default
=
None
,
encoding
=
'utf-8'
,
unicode_errors
=
'strict'
,
use_single_float
=
False
,
autoreset
=
True
,
use_bin_type
=
False
,
strict_types
=
False
):
self
.
_strict_types
=
strict_types
self
.
_use_float
=
use_single_float
self
.
_autoreset
=
autoreset
self
.
_use_bin_type
=
use_bin_type
self
.
_encoding
=
encoding
self
.
_unicode_errors
=
unicode_errors
self
.
_buffer
=
StringIO
()
if
default
is
not
None
:
if
not
callable
(
default
):
raise
TypeError
(
"default must be callable"
)
self
.
_default
=
default
def
_pack
(
self
,
obj
,
nest_limit
=
DEFAULT_RECURSE_LIMIT
,
check
=
isinstance
,
check_type_strict
=
_check_type_strict
):
default_used
=
False
if
self
.
_strict_types
:
check
=
check_type_strict
list_types
=
list
else
:
list_types
=
(
list
,
tuple
)
while
True
:
if
nest_limit
<
0
:
raise
PackValueError
(
"recursion limit exceeded"
)
if
obj
is
None
:
return
self
.
_buffer
.
write
(
b"
\xc0
"
)
if
check
(
obj
,
bool
):
if
obj
:
return
self
.
_buffer
.
write
(
b"
\xc3
"
)
return
self
.
_buffer
.
write
(
b"
\xc2
"
)
if
check
(
obj
,
int_types
):
if
0
<=
obj
<
0x80
:
return
self
.
_buffer
.
write
(
struct
.
pack
(
"B"
,
obj
))
if
-
0x20
<=
obj
<
0
:
return
self
.
_buffer
.
write
(
struct
.
pack
(
"b"
,
obj
))
if
0x80
<=
obj
<=
0xff
:
return
self
.
_buffer
.
write
(
struct
.
pack
(
"BB"
,
0xcc
,
obj
))
if
-
0x80
<=
obj
<
0
:
return
self
.
_buffer
.
write
(
struct
.
pack
(
">Bb"
,
0xd0
,
obj
))
if
0xff
<
obj
<=
0xffff
:
return
self
.
_buffer
.
write
(
struct
.
pack
(
">BH"
,
0xcd
,
obj
))
if
-
0x8000
<=
obj
<
-
0x80
:
return
self
.
_buffer
.
write
(
struct
.
pack
(
">Bh"
,
0xd1
,
obj
))
if
0xffff
<
obj
<=
0xffffffff
:
return
self
.
_buffer
.
write
(
struct
.
pack
(
">BI"
,
0xce
,
obj
))
if
-
0x80000000
<=
obj
<
-
0x8000
:
return
self
.
_buffer
.
write
(
struct
.
pack
(
">Bi"
,
0xd2
,
obj
))
if
0xffffffff
<
obj
<=
0xffffffffffffffff
:
return
self
.
_buffer
.
write
(
struct
.
pack
(
">BQ"
,
0xcf
,
obj
))
if
-
0x8000000000000000
<=
obj
<
-
0x80000000
:
return
self
.
_buffer
.
write
(
struct
.
pack
(
">Bq"
,
0xd3
,
obj
))
if
not
default_used
and
self
.
_default
is
not
None
:
obj
=
self
.
_default
(
obj
)
default_used
=
True
continue
raise
PackOverflowError
(
"Integer value out of range"
)
if
check
(
obj
,
bytes
):
n
=
len
(
obj
)
if
n
>=
2
**
32
:
raise
PackValueError
(
"Bytes is too large"
)
self
.
_pack_bin_header
(
n
)
return
self
.
_buffer
.
write
(
obj
)
if
check
(
obj
,
Unicode
):
if
self
.
_encoding
is
None
:
raise
TypeError
(
"Can't encode unicode string: "
"no encoding is specified"
)
obj
=
obj
.
encode
(
self
.
_encoding
,
self
.
_unicode_errors
)
n
=
len
(
obj
)
if
n
>=
2
**
32
:
raise
PackValueError
(
"String is too large"
)
self
.
_pack_raw_header
(
n
)
return
self
.
_buffer
.
write
(
obj
)
if
check
(
obj
,
memoryview
):
n
=
len
(
obj
)
*
obj
.
itemsize
if
n
>=
2
**
32
:
raise
PackValueError
(
"Memoryview is too large"
)
self
.
_pack_bin_header
(
n
)
return
self
.
_buffer
.
write
(
obj
)
if
check
(
obj
,
float
):
if
self
.
_use_float
:
return
self
.
_buffer
.
write
(
struct
.
pack
(
">Bf"
,
0xca
,
obj
))
return
self
.
_buffer
.
write
(
struct
.
pack
(
">Bd"
,
0xcb
,
obj
))
if
check
(
obj
,
ExtType
):
code
=
obj
.
code
data
=
obj
.
data
assert
isinstance
(
code
,
int
)
assert
isinstance
(
data
,
bytes
)
L
=
len
(
data
)
if
L
==
1
:
self
.
_buffer
.
write
(
b'
\xd4
'
)
elif
L
==
2
:
self
.
_buffer
.
write
(
b'
\xd5
'
)
elif
L
==
4
:
self
.
_buffer
.
write
(
b'
\xd6
'
)
elif
L
==
8
:
self
.
_buffer
.
write
(
b'
\xd7
'
)
elif
L
==
16
:
self
.
_buffer
.
write
(
b'
\xd8
'
)
elif
L
<=
0xff
:
self
.
_buffer
.
write
(
struct
.
pack
(
">BB"
,
0xc7
,
L
))
elif
L
<=
0xffff
:
self
.
_buffer
.
write
(
struct
.
pack
(
">BH"
,
0xc8
,
L
))
else
:
self
.
_buffer
.
write
(
struct
.
pack
(
">BI"
,
0xc9
,
L
))
self
.
_buffer
.
write
(
struct
.
pack
(
"b"
,
code
))
self
.
_buffer
.
write
(
data
)
return
if
check
(
obj
,
list_types
):
n
=
len
(
obj
)
self
.
_pack_array_header
(
n
)
for
i
in
xrange
(
n
):
self
.
_pack
(
obj
[
i
],
nest_limit
-
1
)
return
if
check
(
obj
,
dict
):
return
self
.
_pack_map_pairs
(
len
(
obj
),
dict_iteritems
(
obj
),
nest_limit
-
1
)
if
not
default_used
and
self
.
_default
is
not
None
:
obj
=
self
.
_default
(
obj
)
default_used
=
1
continue
raise
TypeError
(
"Cannot serialize %r"
%
obj
)
def
pack
(
self
,
obj
):
self
.
_pack
(
obj
)
ret
=
self
.
_buffer
.
getvalue
()
if
self
.
_autoreset
:
self
.
_buffer
=
StringIO
()
elif
USING_STRINGBUILDER
:
self
.
_buffer
=
StringIO
(
ret
)
return
ret
def
pack_map_pairs
(
self
,
pairs
):
self
.
_pack_map_pairs
(
len
(
pairs
),
pairs
)
ret
=
self
.
_buffer
.
getvalue
()
if
self
.
_autoreset
:
self
.
_buffer
=
StringIO
()
elif
USING_STRINGBUILDER
:
self
.
_buffer
=
StringIO
(
ret
)
return
ret
def
pack_array_header
(
self
,
n
):
if
n
>=
2
**
32
:
raise
PackValueError
self
.
_pack_array_header
(
n
)
ret
=
self
.
_buffer
.
getvalue
()
if
self
.
_autoreset
:
self
.
_buffer
=
StringIO
()
elif
USING_STRINGBUILDER
:
self
.
_buffer
=
StringIO
(
ret
)
return
ret
def
pack_map_header
(
self
,
n
):
if
n
>=
2
**
32
:
raise
PackValueError
self
.
_pack_map_header
(
n
)
ret
=
self
.
_buffer
.
getvalue
()
if
self
.
_autoreset
:
self
.
_buffer
=
StringIO
()
elif
USING_STRINGBUILDER
:
self
.
_buffer
=
StringIO
(
ret
)
return
ret
def
pack_ext_type
(
self
,
typecode
,
data
):
if
not
isinstance
(
typecode
,
int
):
raise
TypeError
(
"typecode must have int type."
)
if
not
0
<=
typecode
<=
127
:
raise
ValueError
(
"typecode should be 0-127"
)
if
not
isinstance
(
data
,
bytes
):
raise
TypeError
(
"data must have bytes type"
)
L
=
len
(
data
)
if
L
>
0xffffffff
:
raise
PackValueError
(
"Too large data"
)
if
L
==
1
:
self
.
_buffer
.
write
(
b'
\xd4
'
)
elif
L
==
2
:
self
.
_buffer
.
write
(
b'
\xd5
'
)
elif
L
==
4
:
self
.
_buffer
.
write
(
b'
\xd6
'
)
elif
L
==
8
:
self
.
_buffer
.
write
(
b'
\xd7
'
)
elif
L
==
16
:
self
.
_buffer
.
write
(
b'
\xd8
'
)
elif
L
<=
0xff
:
self
.
_buffer
.
write
(
b'
\xc7
'
+
struct
.
pack
(
'B'
,
L
))
elif
L
<=
0xffff
:
self
.
_buffer
.
write
(
b'
\xc8
'
+
struct
.
pack
(
'>H'
,
L
))
else
:
self
.
_buffer
.
write
(
b'
\xc9
'
+
struct
.
pack
(
'>I'
,
L
))
self
.
_buffer
.
write
(
struct
.
pack
(
'B'
,
typecode
))
self
.
_buffer
.
write
(
data
)
def
_pack_array_header
(
self
,
n
):
if
n
<=
0x0f
:
return
self
.
_buffer
.
write
(
struct
.
pack
(
'B'
,
0x90
+
n
))
if
n
<=
0xffff
:
return
self
.
_buffer
.
write
(
struct
.
pack
(
">BH"
,
0xdc
,
n
))
if
n
<=
0xffffffff
:
return
self
.
_buffer
.
write
(
struct
.
pack
(
">BI"
,
0xdd
,
n
))
raise
PackValueError
(
"Array is too large"
)
def
_pack_map_header
(
self
,
n
):
if
n
<=
0x0f
:
return
self
.
_buffer
.
write
(
struct
.
pack
(
'B'
,
0x80
+
n
))
if
n
<=
0xffff
:
return
self
.
_buffer
.
write
(
struct
.
pack
(
">BH"
,
0xde
,
n
))
if
n
<=
0xffffffff
:
return
self
.
_buffer
.
write
(
struct
.
pack
(
">BI"
,
0xdf
,
n
))
raise
PackValueError
(
"Dict is too large"
)
def
_pack_map_pairs
(
self
,
n
,
pairs
,
nest_limit
=
DEFAULT_RECURSE_LIMIT
):
self
.
_pack_map_header
(
n
)
for
(
k
,
v
)
in
pairs
:
self
.
_pack
(
k
,
nest_limit
-
1
)
self
.
_pack
(
v
,
nest_limit
-
1
)
def
_pack_raw_header
(
self
,
n
):
if
n
<=
0x1f
:
self
.
_buffer
.
write
(
struct
.
pack
(
'B'
,
0xa0
+
n
))
elif
self
.
_use_bin_type
and
n
<=
0xff
:
self
.
_buffer
.
write
(
struct
.
pack
(
'>BB'
,
0xd9
,
n
))
elif
n
<=
0xffff
:
self
.
_buffer
.
write
(
struct
.
pack
(
">BH"
,
0xda
,
n
))
elif
n
<=
0xffffffff
:
self
.
_buffer
.
write
(
struct
.
pack
(
">BI"
,
0xdb
,
n
))
else
:
raise
PackValueError
(
'Raw is too large'
)
def
_pack_bin_header
(
self
,
n
):
if
not
self
.
_use_bin_type
:
return
self
.
_pack_raw_header
(
n
)
elif
n
<=
0xff
:
return
self
.
_buffer
.
write
(
struct
.
pack
(
'>BB'
,
0xc4
,
n
))
elif
n
<=
0xffff
:
return
self
.
_buffer
.
write
(
struct
.
pack
(
">BH"
,
0xc5
,
n
))
elif
n
<=
0xffffffff
:
return
self
.
_buffer
.
write
(
struct
.
pack
(
">BI"
,
0xc6
,
n
))
else
:
raise
PackValueError
(
'Bin is too large'
)
def
bytes
(
self
):
return
self
.
_buffer
.
getvalue
()
def
reset
(
self
):
self
.
_buffer
=
StringIO
()
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