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53dbcc1 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 | import os
from collections import defaultdict
from enum import IntEnum, unique
from io import BytesIO
from multiprocessing.pool import ThreadPool
from threading import Lock, RLock
from types import MappingProxyType
from typing import Any, Callable, Optional, Union
from .abstract import AbstractContext, AbstractOperation
fdsync = getattr(os, "fdatasync", os.fsync)
NATIVE_PREAD_PWRITE = hasattr(os, "pread") and hasattr(os, "pwrite")
@unique
class OpCode(IntEnum):
READ = 0
WRITE = 1
FSYNC = 2
FDSYNC = 3
NOOP = -1
class Context(AbstractContext):
"""
python aio context implementation
"""
MAX_POOL_SIZE = 128
def __init__(self, max_requests: int = 32, pool_size: int = 8):
assert pool_size < self.MAX_POOL_SIZE
self.__max_requests = max_requests
self.pool = ThreadPool(pool_size)
self._in_progress = 0
self._closed = False
self._closed_lock = Lock()
if not NATIVE_PREAD_PWRITE:
self._locks_cleaner = RLock() # type: ignore
self._locks = defaultdict(RLock) # type: ignore
@property
def max_requests(self) -> int:
return self.__max_requests
def _execute(self, operation: "Operation"):
handler = self._OP_MAP[operation.opcode]
def on_error(exc):
self._in_progress -= 1
operation.exception = exc
operation.written = 0
operation.callback(None)
def on_success(result):
self._in_progress -= 1
operation.written = result
operation.callback(result)
if self._in_progress > self.__max_requests:
raise RuntimeError(
"Maximum simultaneous requests have been reached",
)
self._in_progress += 1
self.pool.apply_async(
handler, args=(self, operation),
callback=on_success,
error_callback=on_error,
)
if NATIVE_PREAD_PWRITE:
def __pread(self, fd, size, offset):
return os.pread(fd, size, offset)
def __pwrite(self, fd, bytes, offset):
return os.pwrite(fd, bytes, offset)
else:
def __pread(self, fd, size, offset):
with self._locks[fd]:
os.lseek(fd, 0, os.SEEK_SET)
os.lseek(fd, offset, os.SEEK_SET)
return os.read(fd, size)
def __pwrite(self, fd, bytes, offset):
with self._locks[fd]:
os.lseek(fd, 0, os.SEEK_SET)
os.lseek(fd, offset, os.SEEK_SET)
return os.write(fd, bytes)
def _handle_read(self, operation: "Operation"):
return operation.buffer.write(
self.__pread(
operation.fileno,
operation.nbytes,
operation.offset,
),
)
def _handle_write(self, operation: "Operation"):
return self.__pwrite(
operation.fileno, operation.buffer.getvalue(), operation.offset,
)
def _handle_fsync(self, operation: "Operation"):
return os.fsync(operation.fileno)
def _handle_fdsync(self, operation: "Operation"):
return fdsync(operation.fileno)
def _handle_noop(self, operation: "Operation"):
return
def submit(self, *aio_operations) -> int:
operations = []
for operation in aio_operations:
if not isinstance(operation, Operation):
raise ValueError("Invalid Operation %r", operation)
operations.append(operation)
count = 0
for operation in operations:
self._execute(operation)
count += 1
return count
def cancel(self, *aio_operations) -> int:
"""
Cancels multiple Operations. Returns
Operation.cancel(aio_op1, aio_op2, aio_opN, ...) -> int
(Always returns zero, this method exists for compatibility reasons)
"""
return 0
def close(self):
if self._closed:
return
with self._closed_lock:
self.pool.close()
self._closed = True
def __del__(self):
if self.pool.close():
self.close()
_OP_MAP = MappingProxyType({
OpCode.READ: _handle_read,
OpCode.WRITE: _handle_write,
OpCode.FSYNC: _handle_fsync,
OpCode.FDSYNC: _handle_fdsync,
OpCode.NOOP: _handle_noop,
})
# noinspection PyPropertyDefinition
class Operation(AbstractOperation):
"""
python aio operation implementation
"""
def __init__(
self,
fd: int,
nbytes: Optional[int],
offset: Optional[int],
opcode: OpCode,
payload: Optional[bytes] = None,
priority: Optional[int] = None,
):
self.callback = None # type: Optional[Callable[[int], Any]]
self.buffer = BytesIO()
if opcode == OpCode.WRITE and payload:
self.buffer = BytesIO(payload)
self.opcode = opcode
self.__fileno = fd
self.__offset = offset or 0
self.__opcode = opcode
self.__nbytes = nbytes or 0
self.__priority = priority or 0
self.exception = None
self.written = 0
@classmethod
def read(
cls, nbytes: int, fd: int, offset: int, priority=0,
) -> "Operation":
"""
Creates a new instance of Operation on read mode.
"""
return cls(fd, nbytes, offset, opcode=OpCode.READ, priority=priority)
@classmethod
def write(
cls, payload_bytes: bytes, fd: int, offset: int, priority=0,
) -> "Operation":
"""
Creates a new instance of AIOOperation on write mode.
"""
return cls(
fd,
len(payload_bytes),
offset,
payload=payload_bytes,
opcode=OpCode.WRITE,
priority=priority,
)
@classmethod
def fsync(cls, fd: int, priority=0) -> "Operation":
"""
Creates a new instance of AIOOperation on fsync mode.
"""
return cls(fd, None, None, opcode=OpCode.FSYNC, priority=priority)
@classmethod
def fdsync(cls, fd: int, priority=0) -> "Operation":
"""
Creates a new instance of AIOOperation on fdsync mode.
"""
return cls(fd, None, None, opcode=OpCode.FDSYNC, priority=priority)
def get_value(self) -> Union[bytes, int]:
"""
Method returns a bytes value of AIOOperation's result or None.
"""
if self.exception:
raise self.exception
if self.opcode == OpCode.WRITE:
return self.written
if self.buffer is None:
return
return self.buffer.getvalue()
@property
def fileno(self) -> int:
return self.__fileno
@property
def offset(self) -> int:
return self.__offset
@property
def payload(self) -> Optional[memoryview]:
return self.buffer.getbuffer()
@property
def nbytes(self) -> int:
return self.__nbytes
def set_callback(self, callback: Callable[[int], Any]) -> bool:
self.callback = callback
return True
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