331 lines
12 KiB
Cython
331 lines
12 KiB
Cython
# coding: utf-8
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#cython: embedsignature=True
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from cpython cimport *
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from libc.stdlib cimport *
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from libc.string cimport *
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from libc.limits cimport *
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from msgpack.exceptions import PackValueError, PackOverflowError
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from msgpack import ExtType
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cdef extern from "Python.h":
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int PyMemoryView_Check(object obj)
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cdef extern from "pack.h":
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struct msgpack_packer:
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char* buf
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size_t length
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size_t buf_size
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bint use_bin_type
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int msgpack_pack_int(msgpack_packer* pk, int d)
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int msgpack_pack_nil(msgpack_packer* pk)
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int msgpack_pack_true(msgpack_packer* pk)
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int msgpack_pack_false(msgpack_packer* pk)
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int msgpack_pack_long(msgpack_packer* pk, long d)
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int msgpack_pack_long_long(msgpack_packer* pk, long long d)
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int msgpack_pack_unsigned_long_long(msgpack_packer* pk, unsigned long long d)
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int msgpack_pack_float(msgpack_packer* pk, float d)
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int msgpack_pack_double(msgpack_packer* pk, double d)
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int msgpack_pack_array(msgpack_packer* pk, size_t l)
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int msgpack_pack_map(msgpack_packer* pk, size_t l)
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int msgpack_pack_raw(msgpack_packer* pk, size_t l)
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int msgpack_pack_bin(msgpack_packer* pk, size_t l)
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int msgpack_pack_raw_body(msgpack_packer* pk, char* body, size_t l)
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int msgpack_pack_ext(msgpack_packer* pk, char typecode, size_t l)
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cdef int DEFAULT_RECURSE_LIMIT=511
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cdef size_t ITEM_LIMIT = (2**32)-1
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cdef class Packer(object):
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"""
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MessagePack Packer
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usage::
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packer = Packer()
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astream.write(packer.pack(a))
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astream.write(packer.pack(b))
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Packer's constructor has some keyword arguments:
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:param callable default:
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Convert user type to builtin type that Packer supports.
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See also simplejson's document.
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:param str encoding:
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Convert unicode to bytes with this encoding. (default: 'utf-8')
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:param str unicode_errors:
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Error handler for encoding unicode. (default: 'strict')
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:param bool use_single_float:
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Use single precision float type for float. (default: False)
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:param bool autoreset:
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Reset buffer after each pack and return it's content as `bytes`. (default: True).
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If set this to false, use `bytes()` to get content and `.reset()` to clear buffer.
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:param bool use_bin_type:
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Use bin type introduced in msgpack spec 2.0 for bytes.
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It also enable str8 type for unicode.
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:param bool strict_types:
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If set to true, types will be checked to be exact. Derived classes
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from serializeable types will not be serialized and will be
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treated as unsupported type and forwarded to default.
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Additionally tuples will not be serialized as lists.
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This is useful when trying to implement accurate serialization
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for python types.
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"""
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cdef msgpack_packer pk
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cdef object _default
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cdef object _bencoding
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cdef object _berrors
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cdef char *encoding
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cdef char *unicode_errors
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cdef bint strict_types
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cdef bool use_float
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cdef bint autoreset
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def __cinit__(self):
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cdef int buf_size = 1024*1024
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self.pk.buf = <char*> PyMem_Malloc(buf_size)
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if self.pk.buf == NULL:
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raise MemoryError("Unable to allocate internal buffer.")
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self.pk.buf_size = buf_size
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self.pk.length = 0
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def __init__(self, default=None, encoding='utf-8', unicode_errors='strict',
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use_single_float=False, bint autoreset=1, bint use_bin_type=0,
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bint strict_types=0):
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self.use_float = use_single_float
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self.strict_types = strict_types
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self.autoreset = autoreset
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self.pk.use_bin_type = use_bin_type
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if default is not None:
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if not PyCallable_Check(default):
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raise TypeError("default must be a callable.")
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self._default = default
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if encoding is None:
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self.encoding = NULL
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self.unicode_errors = NULL
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else:
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if isinstance(encoding, unicode):
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self._bencoding = encoding.encode('ascii')
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else:
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self._bencoding = encoding
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self.encoding = PyBytes_AsString(self._bencoding)
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if isinstance(unicode_errors, unicode):
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self._berrors = unicode_errors.encode('ascii')
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else:
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self._berrors = unicode_errors
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self.unicode_errors = PyBytes_AsString(self._berrors)
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def __dealloc__(self):
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PyMem_Free(self.pk.buf)
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self.pk.buf = NULL
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cdef int _pack(self, object o, int nest_limit=DEFAULT_RECURSE_LIMIT) except -1:
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cdef long long llval
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cdef unsigned long long ullval
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cdef long longval
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cdef float fval
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cdef double dval
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cdef char* rawval
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cdef int ret
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cdef dict d
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cdef size_t L
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cdef int default_used = 0
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cdef bint strict_types = self.strict_types
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cdef Py_buffer view
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if nest_limit < 0:
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raise PackValueError("recursion limit exceeded.")
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while True:
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if o is None:
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ret = msgpack_pack_nil(&self.pk)
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elif PyBool_Check(o) if strict_types else isinstance(o, bool):
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if o:
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ret = msgpack_pack_true(&self.pk)
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else:
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ret = msgpack_pack_false(&self.pk)
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elif PyLong_CheckExact(o) if strict_types else PyLong_Check(o):
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# PyInt_Check(long) is True for Python 3.
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# So we should test long before int.
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try:
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if o > 0:
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ullval = o
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ret = msgpack_pack_unsigned_long_long(&self.pk, ullval)
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else:
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llval = o
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ret = msgpack_pack_long_long(&self.pk, llval)
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except OverflowError as oe:
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if not default_used and self._default is not None:
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o = self._default(o)
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default_used = True
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continue
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else:
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raise PackOverflowError("Integer value out of range")
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elif PyInt_CheckExact(o) if strict_types else PyInt_Check(o):
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longval = o
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ret = msgpack_pack_long(&self.pk, longval)
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elif PyFloat_CheckExact(o) if strict_types else PyFloat_Check(o):
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if self.use_float:
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fval = o
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ret = msgpack_pack_float(&self.pk, fval)
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else:
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dval = o
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ret = msgpack_pack_double(&self.pk, dval)
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elif PyBytes_CheckExact(o) if strict_types else PyBytes_Check(o):
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L = len(o)
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if L > ITEM_LIMIT:
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raise PackValueError("bytes is too large")
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rawval = o
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ret = msgpack_pack_bin(&self.pk, L)
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if ret == 0:
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ret = msgpack_pack_raw_body(&self.pk, rawval, L)
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elif PyUnicode_CheckExact(o) if strict_types else PyUnicode_Check(o):
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if not self.encoding:
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raise TypeError("Can't encode unicode string: no encoding is specified")
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o = PyUnicode_AsEncodedString(o, self.encoding, self.unicode_errors)
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L = len(o)
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if L > ITEM_LIMIT:
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raise PackValueError("unicode string is too large")
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rawval = o
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ret = msgpack_pack_raw(&self.pk, L)
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if ret == 0:
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ret = msgpack_pack_raw_body(&self.pk, rawval, L)
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elif PyDict_CheckExact(o):
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d = <dict>o
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L = len(d)
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if L > ITEM_LIMIT:
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raise PackValueError("dict is too large")
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ret = msgpack_pack_map(&self.pk, L)
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if ret == 0:
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for k, v in d.iteritems():
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ret = self._pack(k, nest_limit-1)
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if ret != 0: break
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ret = self._pack(v, nest_limit-1)
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if ret != 0: break
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elif not strict_types and PyDict_Check(o):
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L = len(o)
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if L > ITEM_LIMIT:
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raise PackValueError("dict is too large")
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ret = msgpack_pack_map(&self.pk, L)
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if ret == 0:
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for k, v in o.items():
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ret = self._pack(k, nest_limit-1)
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if ret != 0: break
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ret = self._pack(v, nest_limit-1)
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if ret != 0: break
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elif type(o) is ExtType if strict_types else isinstance(o, ExtType):
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# This should be before Tuple because ExtType is namedtuple.
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longval = o.code
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rawval = o.data
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L = len(o.data)
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if L > ITEM_LIMIT:
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raise PackValueError("EXT data is too large")
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ret = msgpack_pack_ext(&self.pk, longval, L)
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ret = msgpack_pack_raw_body(&self.pk, rawval, L)
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elif PyList_CheckExact(o) if strict_types else (PyTuple_Check(o) or PyList_Check(o)):
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L = len(o)
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if L > ITEM_LIMIT:
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raise PackValueError("list is too large")
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ret = msgpack_pack_array(&self.pk, L)
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if ret == 0:
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for v in o:
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ret = self._pack(v, nest_limit-1)
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if ret != 0: break
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elif PyMemoryView_Check(o):
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if PyObject_GetBuffer(o, &view, PyBUF_SIMPLE) != 0:
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raise PackValueError("could not get buffer for memoryview")
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L = view.len
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if L > ITEM_LIMIT:
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PyBuffer_Release(&view);
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raise PackValueError("memoryview is too large")
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ret = msgpack_pack_bin(&self.pk, L)
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if ret == 0:
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ret = msgpack_pack_raw_body(&self.pk, <char*>view.buf, L)
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PyBuffer_Release(&view);
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elif not default_used and self._default:
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o = self._default(o)
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default_used = 1
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continue
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else:
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raise TypeError("can't serialize %r" % (o,))
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return ret
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cpdef pack(self, object obj):
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cdef int ret
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ret = self._pack(obj, DEFAULT_RECURSE_LIMIT)
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if ret == -1:
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raise MemoryError
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elif ret: # should not happen.
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raise TypeError
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if self.autoreset:
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buf = PyBytes_FromStringAndSize(self.pk.buf, self.pk.length)
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self.pk.length = 0
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return buf
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def pack_ext_type(self, typecode, data):
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msgpack_pack_ext(&self.pk, typecode, len(data))
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msgpack_pack_raw_body(&self.pk, data, len(data))
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def pack_array_header(self, size_t size):
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if size > ITEM_LIMIT:
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raise PackValueError
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cdef int ret = msgpack_pack_array(&self.pk, size)
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if ret == -1:
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raise MemoryError
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elif ret: # should not happen
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raise TypeError
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if self.autoreset:
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buf = PyBytes_FromStringAndSize(self.pk.buf, self.pk.length)
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self.pk.length = 0
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return buf
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def pack_map_header(self, size_t size):
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if size > ITEM_LIMIT:
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raise PackValueError
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cdef int ret = msgpack_pack_map(&self.pk, size)
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if ret == -1:
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raise MemoryError
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elif ret: # should not happen
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raise TypeError
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if self.autoreset:
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buf = PyBytes_FromStringAndSize(self.pk.buf, self.pk.length)
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self.pk.length = 0
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return buf
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def pack_map_pairs(self, object pairs):
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"""
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Pack *pairs* as msgpack map type.
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*pairs* should sequence of pair.
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(`len(pairs)` and `for k, v in pairs:` should be supported.)
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"""
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cdef int ret = msgpack_pack_map(&self.pk, len(pairs))
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if ret == 0:
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for k, v in pairs:
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ret = self._pack(k)
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if ret != 0: break
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ret = self._pack(v)
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if ret != 0: break
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if ret == -1:
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raise MemoryError
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elif ret: # should not happen
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raise TypeError
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if self.autoreset:
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buf = PyBytes_FromStringAndSize(self.pk.buf, self.pk.length)
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self.pk.length = 0
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return buf
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def reset(self):
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"""Clear internal buffer."""
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self.pk.length = 0
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def bytes(self):
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"""Return buffer content."""
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return PyBytes_FromStringAndSize(self.pk.buf, self.pk.length)
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