818 lines
25 KiB
Cython
818 lines
25 KiB
Cython
# Copyright (C) 2016-present the asyncpg authors and contributors
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# <see AUTHORS file>
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#
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# This module is part of asyncpg and is released under
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# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
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from libc.string cimport memcpy
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import collections
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class BufferError(Exception):
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pass
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@cython.no_gc_clear
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@cython.final
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@cython.freelist(_BUFFER_FREELIST_SIZE)
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cdef class WriteBuffer:
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def __cinit__(self):
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self._smallbuf_inuse = True
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self._buf = self._smallbuf
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self._size = _BUFFER_INITIAL_SIZE
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self._length = 0
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self._message_mode = 0
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def __dealloc__(self):
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if self._buf is not NULL and not self._smallbuf_inuse:
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cpython.PyMem_Free(self._buf)
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self._buf = NULL
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self._size = 0
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if self._view_count:
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raise BufferError(
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'Deallocating buffer with attached memoryviews')
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def __getbuffer__(self, Py_buffer *buffer, int flags):
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self._view_count += 1
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cpython.PyBuffer_FillInfo(
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buffer, self, self._buf, self._length,
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1, # read-only
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flags)
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def __releasebuffer__(self, Py_buffer *buffer):
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self._view_count -= 1
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cdef inline _check_readonly(self):
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if self._view_count:
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raise BufferError('the buffer is in read-only mode')
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cdef inline _ensure_alloced(self, ssize_t extra_length):
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cdef ssize_t new_size = extra_length + self._length
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if new_size > self._size:
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self._reallocate(new_size)
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cdef _reallocate(self, ssize_t new_size):
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cdef char *new_buf
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if new_size < _BUFFER_MAX_GROW:
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new_size = _BUFFER_MAX_GROW
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else:
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# Add a little extra
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new_size += _BUFFER_INITIAL_SIZE
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if self._smallbuf_inuse:
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new_buf = <char*>cpython.PyMem_Malloc(
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sizeof(char) * <size_t>new_size)
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if new_buf is NULL:
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self._buf = NULL
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self._size = 0
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self._length = 0
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raise MemoryError
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memcpy(new_buf, self._buf, <size_t>self._size)
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self._size = new_size
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self._buf = new_buf
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self._smallbuf_inuse = False
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else:
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new_buf = <char*>cpython.PyMem_Realloc(
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<void*>self._buf, <size_t>new_size)
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if new_buf is NULL:
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cpython.PyMem_Free(self._buf)
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self._buf = NULL
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self._size = 0
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self._length = 0
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raise MemoryError
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self._buf = new_buf
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self._size = new_size
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cdef inline start_message(self, char type):
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if self._length != 0:
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raise BufferError(
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'cannot start_message for a non-empty buffer')
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self._ensure_alloced(5)
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self._message_mode = 1
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self._buf[0] = type
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self._length = 5
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cdef inline end_message(self):
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# "length-1" to exclude the message type byte
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cdef ssize_t mlen = self._length - 1
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self._check_readonly()
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if not self._message_mode:
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raise BufferError(
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'end_message can only be called with start_message')
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if self._length < 5:
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raise BufferError('end_message: buffer is too small')
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if mlen > _MAXINT32:
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raise BufferError('end_message: message is too large')
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hton.pack_int32(&self._buf[1], <int32_t>mlen)
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return self
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cdef inline reset(self):
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self._length = 0
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self._message_mode = 0
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cdef write_buffer(self, WriteBuffer buf):
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self._check_readonly()
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if not buf._length:
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return
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self._ensure_alloced(buf._length)
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memcpy(self._buf + self._length,
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<void*>buf._buf,
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<size_t>buf._length)
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self._length += buf._length
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cdef write_byte(self, char b):
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self._check_readonly()
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self._ensure_alloced(1)
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self._buf[self._length] = b
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self._length += 1
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cdef write_bytes(self, bytes data):
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cdef char* buf
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cdef ssize_t len
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cpython.PyBytes_AsStringAndSize(data, &buf, &len)
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self.write_cstr(buf, len)
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cdef write_bytestring(self, bytes string):
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cdef char* buf
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cdef ssize_t len
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cpython.PyBytes_AsStringAndSize(string, &buf, &len)
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# PyBytes_AsStringAndSize returns a null-terminated buffer,
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# but the null byte is not counted in len. hence the + 1
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self.write_cstr(buf, len + 1)
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cdef write_str(self, str string, str encoding):
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self.write_bytestring(string.encode(encoding))
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cdef write_len_prefixed_buffer(self, WriteBuffer buf):
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# Write a length-prefixed (not NULL-terminated) bytes sequence.
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self.write_int32(<int32_t>buf.len())
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self.write_buffer(buf)
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cdef write_len_prefixed_bytes(self, bytes data):
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# Write a length-prefixed (not NULL-terminated) bytes sequence.
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cdef:
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char *buf
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ssize_t size
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cpython.PyBytes_AsStringAndSize(data, &buf, &size)
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if size > _MAXINT32:
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raise BufferError('string is too large')
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# `size` does not account for the NULL at the end.
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self.write_int32(<int32_t>size)
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self.write_cstr(buf, size)
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cdef write_frbuf(self, FRBuffer *buf):
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cdef:
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ssize_t buf_len = buf.len
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if buf_len > 0:
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self.write_cstr(frb_read_all(buf), buf_len)
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cdef write_cstr(self, const char *data, ssize_t len):
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self._check_readonly()
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self._ensure_alloced(len)
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memcpy(self._buf + self._length, <void*>data, <size_t>len)
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self._length += len
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cdef write_int16(self, int16_t i):
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self._check_readonly()
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self._ensure_alloced(2)
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hton.pack_int16(&self._buf[self._length], i)
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self._length += 2
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cdef write_int32(self, int32_t i):
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self._check_readonly()
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self._ensure_alloced(4)
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hton.pack_int32(&self._buf[self._length], i)
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self._length += 4
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cdef write_int64(self, int64_t i):
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self._check_readonly()
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self._ensure_alloced(8)
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hton.pack_int64(&self._buf[self._length], i)
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self._length += 8
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cdef write_float(self, float f):
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self._check_readonly()
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self._ensure_alloced(4)
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hton.pack_float(&self._buf[self._length], f)
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self._length += 4
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cdef write_double(self, double d):
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self._check_readonly()
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self._ensure_alloced(8)
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hton.pack_double(&self._buf[self._length], d)
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self._length += 8
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@staticmethod
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cdef WriteBuffer new_message(char type):
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cdef WriteBuffer buf
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buf = WriteBuffer.__new__(WriteBuffer)
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buf.start_message(type)
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return buf
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@staticmethod
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cdef WriteBuffer new():
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cdef WriteBuffer buf
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buf = WriteBuffer.__new__(WriteBuffer)
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return buf
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@cython.no_gc_clear
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@cython.final
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@cython.freelist(_BUFFER_FREELIST_SIZE)
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cdef class ReadBuffer:
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def __cinit__(self):
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self._bufs = collections.deque()
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self._bufs_append = self._bufs.append
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self._bufs_popleft = self._bufs.popleft
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self._bufs_len = 0
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self._buf0 = None
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self._buf0_prev = None
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self._pos0 = 0
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self._len0 = 0
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self._length = 0
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self._current_message_type = 0
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self._current_message_len = 0
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self._current_message_len_unread = 0
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self._current_message_ready = 0
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cdef feed_data(self, data):
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cdef:
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ssize_t dlen
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bytes data_bytes
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if not cpython.PyBytes_CheckExact(data):
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if cpythonx.PyByteArray_CheckExact(data):
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# ProactorEventLoop in Python 3.10+ seems to be sending
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# bytearray objects instead of bytes. Handle this here
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# to avoid duplicating this check in every data_received().
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data = bytes(data)
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else:
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raise BufferError(
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'feed_data: a bytes or bytearray object expected')
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# Uncomment the below code to test code paths that
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# read single int/str/bytes sequences are split over
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# multiple received buffers.
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#
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# ll = 107
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# if len(data) > ll:
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# self.feed_data(data[:ll])
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# self.feed_data(data[ll:])
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# return
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data_bytes = <bytes>data
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dlen = cpython.Py_SIZE(data_bytes)
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if dlen == 0:
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# EOF?
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return
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self._bufs_append(data_bytes)
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self._length += dlen
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if self._bufs_len == 0:
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# First buffer
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self._len0 = dlen
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self._buf0 = data_bytes
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self._bufs_len += 1
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cdef inline _ensure_first_buf(self):
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if PG_DEBUG:
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if self._len0 == 0:
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raise BufferError('empty first buffer')
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if self._length == 0:
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raise BufferError('empty buffer')
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if self._pos0 == self._len0:
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self._switch_to_next_buf()
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cdef _switch_to_next_buf(self):
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# The first buffer is fully read, discard it
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self._bufs_popleft()
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self._bufs_len -= 1
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# Shouldn't fail, since we've checked that `_length >= 1`
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# in _ensure_first_buf()
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self._buf0_prev = self._buf0
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self._buf0 = <bytes>self._bufs[0]
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self._pos0 = 0
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self._len0 = len(self._buf0)
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if PG_DEBUG:
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if self._len0 < 1:
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raise BufferError(
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'debug: second buffer of ReadBuffer is empty')
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cdef inline const char* _try_read_bytes(self, ssize_t nbytes):
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# Try to read *nbytes* from the first buffer.
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#
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# Returns pointer to data if there is at least *nbytes*
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# in the buffer, NULL otherwise.
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#
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# Important: caller must call _ensure_first_buf() prior
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# to calling try_read_bytes, and must not overread
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cdef:
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const char *result
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if PG_DEBUG:
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if nbytes > self._length:
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return NULL
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if self._current_message_ready:
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if self._current_message_len_unread < nbytes:
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return NULL
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if self._pos0 + nbytes <= self._len0:
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result = cpython.PyBytes_AS_STRING(self._buf0)
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result += self._pos0
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self._pos0 += nbytes
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self._length -= nbytes
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if self._current_message_ready:
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self._current_message_len_unread -= nbytes
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return result
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else:
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return NULL
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cdef inline _read_into(self, char *buf, ssize_t nbytes):
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cdef:
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ssize_t nread
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char *buf0
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while True:
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buf0 = cpython.PyBytes_AS_STRING(self._buf0)
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if self._pos0 + nbytes > self._len0:
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nread = self._len0 - self._pos0
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memcpy(buf, buf0 + self._pos0, <size_t>nread)
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self._pos0 = self._len0
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self._length -= nread
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nbytes -= nread
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buf += nread
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self._ensure_first_buf()
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else:
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memcpy(buf, buf0 + self._pos0, <size_t>nbytes)
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self._pos0 += nbytes
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self._length -= nbytes
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break
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cdef inline _read_and_discard(self, ssize_t nbytes):
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cdef:
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ssize_t nread
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self._ensure_first_buf()
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while True:
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if self._pos0 + nbytes > self._len0:
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nread = self._len0 - self._pos0
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self._pos0 = self._len0
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self._length -= nread
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nbytes -= nread
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self._ensure_first_buf()
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else:
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self._pos0 += nbytes
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self._length -= nbytes
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break
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cdef bytes read_bytes(self, ssize_t nbytes):
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cdef:
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bytes result
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ssize_t nread
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const char *cbuf
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char *buf
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self._ensure_first_buf()
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cbuf = self._try_read_bytes(nbytes)
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if cbuf != NULL:
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return cpython.PyBytes_FromStringAndSize(cbuf, nbytes)
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if nbytes > self._length:
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raise BufferError(
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'not enough data to read {} bytes'.format(nbytes))
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if self._current_message_ready:
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self._current_message_len_unread -= nbytes
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if self._current_message_len_unread < 0:
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raise BufferError('buffer overread')
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result = cpython.PyBytes_FromStringAndSize(NULL, nbytes)
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buf = cpython.PyBytes_AS_STRING(result)
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self._read_into(buf, nbytes)
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return result
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cdef bytes read_len_prefixed_bytes(self):
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cdef int32_t size = self.read_int32()
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if size < 0:
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raise BufferError(
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'negative length for a len-prefixed bytes value')
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if size == 0:
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return b''
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return self.read_bytes(size)
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cdef str read_len_prefixed_utf8(self):
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cdef:
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int32_t size
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const char *cbuf
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size = self.read_int32()
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if size < 0:
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raise BufferError(
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'negative length for a len-prefixed bytes value')
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if size == 0:
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return ''
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self._ensure_first_buf()
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cbuf = self._try_read_bytes(size)
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if cbuf != NULL:
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return cpython.PyUnicode_DecodeUTF8(cbuf, size, NULL)
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else:
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return self.read_bytes(size).decode('utf-8')
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cdef read_uuid(self):
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cdef:
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bytes mem
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const char *cbuf
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self._ensure_first_buf()
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cbuf = self._try_read_bytes(16)
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if cbuf != NULL:
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return pg_uuid_from_buf(cbuf)
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else:
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return pg_UUID(self.read_bytes(16))
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cdef inline char read_byte(self) except? -1:
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cdef const char *first_byte
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if PG_DEBUG:
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if not self._buf0:
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raise BufferError(
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'debug: first buffer of ReadBuffer is empty')
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self._ensure_first_buf()
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first_byte = self._try_read_bytes(1)
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if first_byte is NULL:
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raise BufferError('not enough data to read one byte')
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return first_byte[0]
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cdef inline int64_t read_int64(self) except? -1:
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cdef:
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bytes mem
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const char *cbuf
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self._ensure_first_buf()
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cbuf = self._try_read_bytes(8)
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if cbuf != NULL:
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return hton.unpack_int64(cbuf)
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else:
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mem = self.read_bytes(8)
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return hton.unpack_int64(cpython.PyBytes_AS_STRING(mem))
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cdef inline int32_t read_int32(self) except? -1:
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cdef:
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bytes mem
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const char *cbuf
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self._ensure_first_buf()
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cbuf = self._try_read_bytes(4)
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if cbuf != NULL:
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return hton.unpack_int32(cbuf)
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else:
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mem = self.read_bytes(4)
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return hton.unpack_int32(cpython.PyBytes_AS_STRING(mem))
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cdef inline int16_t read_int16(self) except? -1:
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cdef:
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bytes mem
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const char *cbuf
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self._ensure_first_buf()
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cbuf = self._try_read_bytes(2)
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if cbuf != NULL:
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return hton.unpack_int16(cbuf)
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else:
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mem = self.read_bytes(2)
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return hton.unpack_int16(cpython.PyBytes_AS_STRING(mem))
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cdef inline read_null_str(self):
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if not self._current_message_ready:
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raise BufferError(
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'read_null_str only works when the message guaranteed '
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'to be in the buffer')
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cdef:
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ssize_t pos
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ssize_t nread
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bytes result
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const char *buf
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const char *buf_start
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self._ensure_first_buf()
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buf_start = cpython.PyBytes_AS_STRING(self._buf0)
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buf = buf_start + self._pos0
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while buf - buf_start < self._len0:
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if buf[0] == 0:
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pos = buf - buf_start
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nread = pos - self._pos0
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buf = self._try_read_bytes(nread + 1)
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if buf != NULL:
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return cpython.PyBytes_FromStringAndSize(buf, nread)
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else:
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break
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else:
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buf += 1
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result = b''
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while True:
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pos = self._buf0.find(b'\x00', self._pos0)
|
|
if pos >= 0:
|
|
result += self._buf0[self._pos0 : pos]
|
|
nread = pos - self._pos0 + 1
|
|
self._pos0 = pos + 1
|
|
self._length -= nread
|
|
|
|
self._current_message_len_unread -= nread
|
|
if self._current_message_len_unread < 0:
|
|
raise BufferError(
|
|
'read_null_str: buffer overread')
|
|
|
|
return result
|
|
|
|
else:
|
|
result += self._buf0[self._pos0:]
|
|
nread = self._len0 - self._pos0
|
|
self._pos0 = self._len0
|
|
self._length -= nread
|
|
|
|
self._current_message_len_unread -= nread
|
|
if self._current_message_len_unread < 0:
|
|
raise BufferError(
|
|
'read_null_str: buffer overread')
|
|
|
|
self._ensure_first_buf()
|
|
|
|
cdef int32_t take_message(self) except -1:
|
|
cdef:
|
|
const char *cbuf
|
|
|
|
if self._current_message_ready:
|
|
return 1
|
|
|
|
if self._current_message_type == 0:
|
|
if self._length < 1:
|
|
return 0
|
|
self._ensure_first_buf()
|
|
cbuf = self._try_read_bytes(1)
|
|
if cbuf == NULL:
|
|
raise BufferError(
|
|
'failed to read one byte on a non-empty buffer')
|
|
self._current_message_type = cbuf[0]
|
|
|
|
if self._current_message_len == 0:
|
|
if self._length < 4:
|
|
return 0
|
|
|
|
self._ensure_first_buf()
|
|
cbuf = self._try_read_bytes(4)
|
|
if cbuf != NULL:
|
|
self._current_message_len = hton.unpack_int32(cbuf)
|
|
else:
|
|
self._current_message_len = self.read_int32()
|
|
|
|
self._current_message_len_unread = self._current_message_len - 4
|
|
|
|
if self._length < self._current_message_len_unread:
|
|
return 0
|
|
|
|
self._current_message_ready = 1
|
|
return 1
|
|
|
|
cdef inline int32_t take_message_type(self, char mtype) except -1:
|
|
cdef const char *buf0
|
|
|
|
if self._current_message_ready:
|
|
return self._current_message_type == mtype
|
|
elif self._length >= 1:
|
|
self._ensure_first_buf()
|
|
buf0 = cpython.PyBytes_AS_STRING(self._buf0)
|
|
|
|
return buf0[self._pos0] == mtype and self.take_message()
|
|
else:
|
|
return 0
|
|
|
|
cdef int32_t put_message(self) except -1:
|
|
if not self._current_message_ready:
|
|
raise BufferError(
|
|
'cannot put message: no message taken')
|
|
self._current_message_ready = False
|
|
return 0
|
|
|
|
cdef inline const char* try_consume_message(self, ssize_t* len):
|
|
cdef:
|
|
ssize_t buf_len
|
|
const char *buf
|
|
|
|
if not self._current_message_ready:
|
|
return NULL
|
|
|
|
self._ensure_first_buf()
|
|
buf_len = self._current_message_len_unread
|
|
buf = self._try_read_bytes(buf_len)
|
|
if buf != NULL:
|
|
len[0] = buf_len
|
|
self._finish_message()
|
|
return buf
|
|
|
|
cdef discard_message(self):
|
|
if not self._current_message_ready:
|
|
raise BufferError('no message to discard')
|
|
if self._current_message_len_unread > 0:
|
|
self._read_and_discard(self._current_message_len_unread)
|
|
self._current_message_len_unread = 0
|
|
self._finish_message()
|
|
|
|
cdef bytes consume_message(self):
|
|
if not self._current_message_ready:
|
|
raise BufferError('no message to consume')
|
|
if self._current_message_len_unread > 0:
|
|
mem = self.read_bytes(self._current_message_len_unread)
|
|
else:
|
|
mem = b''
|
|
self._finish_message()
|
|
return mem
|
|
|
|
cdef redirect_messages(self, WriteBuffer buf, char mtype,
|
|
int stop_at=0):
|
|
if not self._current_message_ready:
|
|
raise BufferError(
|
|
'consume_full_messages called on a buffer without a '
|
|
'complete first message')
|
|
if mtype != self._current_message_type:
|
|
raise BufferError(
|
|
'consume_full_messages called with a wrong mtype')
|
|
if self._current_message_len_unread != self._current_message_len - 4:
|
|
raise BufferError(
|
|
'consume_full_messages called on a partially read message')
|
|
|
|
cdef:
|
|
const char* cbuf
|
|
ssize_t cbuf_len
|
|
int32_t msg_len
|
|
ssize_t new_pos0
|
|
ssize_t pos_delta
|
|
int32_t done
|
|
|
|
while True:
|
|
buf.write_byte(mtype)
|
|
buf.write_int32(self._current_message_len)
|
|
|
|
cbuf = self.try_consume_message(&cbuf_len)
|
|
if cbuf != NULL:
|
|
buf.write_cstr(cbuf, cbuf_len)
|
|
else:
|
|
buf.write_bytes(self.consume_message())
|
|
|
|
if self._length > 0:
|
|
self._ensure_first_buf()
|
|
else:
|
|
return
|
|
|
|
if stop_at and buf._length >= stop_at:
|
|
return
|
|
|
|
# Fast path: exhaust buf0 as efficiently as possible.
|
|
if self._pos0 + 5 <= self._len0:
|
|
cbuf = cpython.PyBytes_AS_STRING(self._buf0)
|
|
new_pos0 = self._pos0
|
|
cbuf_len = self._len0
|
|
|
|
done = 0
|
|
# Scan the first buffer and find the position of the
|
|
# end of the last "mtype" message.
|
|
while new_pos0 + 5 <= cbuf_len:
|
|
if (cbuf + new_pos0)[0] != mtype:
|
|
done = 1
|
|
break
|
|
if (stop_at and
|
|
(buf._length + new_pos0 - self._pos0) > stop_at):
|
|
done = 1
|
|
break
|
|
msg_len = hton.unpack_int32(cbuf + new_pos0 + 1) + 1
|
|
if new_pos0 + msg_len > cbuf_len:
|
|
break
|
|
new_pos0 += msg_len
|
|
|
|
if new_pos0 != self._pos0:
|
|
assert self._pos0 < new_pos0 <= self._len0
|
|
|
|
pos_delta = new_pos0 - self._pos0
|
|
buf.write_cstr(
|
|
cbuf + self._pos0,
|
|
pos_delta)
|
|
|
|
self._pos0 = new_pos0
|
|
self._length -= pos_delta
|
|
|
|
assert self._length >= 0
|
|
|
|
if done:
|
|
# The next message is of a different type.
|
|
return
|
|
|
|
# Back to slow path.
|
|
if not self.take_message_type(mtype):
|
|
return
|
|
|
|
cdef bytearray consume_messages(self, char mtype):
|
|
"""Consume consecutive messages of the same type."""
|
|
cdef:
|
|
char *buf
|
|
ssize_t nbytes
|
|
ssize_t total_bytes = 0
|
|
bytearray result
|
|
|
|
if not self.take_message_type(mtype):
|
|
return None
|
|
|
|
# consume_messages is a volume-oriented method, so
|
|
# we assume that the remainder of the buffer will contain
|
|
# messages of the requested type.
|
|
result = cpythonx.PyByteArray_FromStringAndSize(NULL, self._length)
|
|
buf = cpythonx.PyByteArray_AsString(result)
|
|
|
|
while self.take_message_type(mtype):
|
|
self._ensure_first_buf()
|
|
nbytes = self._current_message_len_unread
|
|
self._read_into(buf, nbytes)
|
|
buf += nbytes
|
|
total_bytes += nbytes
|
|
self._finish_message()
|
|
|
|
# Clamp the result to an actual size read.
|
|
cpythonx.PyByteArray_Resize(result, total_bytes)
|
|
|
|
return result
|
|
|
|
cdef finish_message(self):
|
|
if self._current_message_type == 0 or not self._current_message_ready:
|
|
# The message has already been finished (e.g by consume_message()),
|
|
# or has been put back by put_message().
|
|
return
|
|
|
|
if self._current_message_len_unread:
|
|
if PG_DEBUG:
|
|
mtype = chr(self._current_message_type)
|
|
|
|
discarded = self.consume_message()
|
|
|
|
if PG_DEBUG:
|
|
print('!!! discarding message {!r} unread data: {!r}'.format(
|
|
mtype,
|
|
discarded))
|
|
|
|
self._finish_message()
|
|
|
|
cdef inline _finish_message(self):
|
|
self._current_message_type = 0
|
|
self._current_message_len = 0
|
|
self._current_message_ready = 0
|
|
self._current_message_len_unread = 0
|
|
|
|
@staticmethod
|
|
cdef ReadBuffer new_message_parser(object data):
|
|
cdef ReadBuffer buf
|
|
|
|
buf = ReadBuffer.__new__(ReadBuffer)
|
|
buf.feed_data(data)
|
|
|
|
buf._current_message_ready = 1
|
|
buf._current_message_len_unread = buf._len0
|
|
|
|
return buf
|