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from logging import getLogger
from typing import Any, Union
from ..exceptions import ConnectionError, InvalidResponse, ResponseError
from ..typing import EncodableT
from .base import _AsyncRESPBase, _RESPBase
from .socket import SERVER_CLOSED_CONNECTION_ERROR
class _RESP3Parser(_RESPBase):
"""RESP3 protocol implementation"""
def __init__(self, socket_read_size):
super().__init__(socket_read_size)
self.push_handler_func = self.handle_push_response
def handle_push_response(self, response):
logger = getLogger("push_response")
logger.info("Push response: " + str(response))
return response
def read_response(self, disable_decoding=False, push_request=False):
pos = self._buffer.get_pos()
try:
result = self._read_response(
disable_decoding=disable_decoding, push_request=push_request
)
except BaseException:
self._buffer.rewind(pos)
raise
else:
self._buffer.purge()
return result
def _read_response(self, disable_decoding=False, push_request=False):
raw = self._buffer.readline()
if not raw:
raise ConnectionError(SERVER_CLOSED_CONNECTION_ERROR)
byte, response = raw[:1], raw[1:]
# server returned an error
if byte in (b"-", b"!"):
if byte == b"!":
response = self._buffer.read(int(response))
response = response.decode("utf-8", errors="replace")
error = self.parse_error(response)
# if the error is a ConnectionError, raise immediately so the user
# is notified
if isinstance(error, ConnectionError):
raise error
# otherwise, we're dealing with a ResponseError that might belong
# inside a pipeline response. the connection's read_response()
# and/or the pipeline's execute() will raise this error if
# necessary, so just return the exception instance here.
return error
# single value
elif byte == b"+":
pass
# null value
elif byte == b"_":
return None
# int and big int values
elif byte in (b":", b"("):
return int(response)
# double value
elif byte == b",":
return float(response)
# bool value
elif byte == b"#":
return response == b"t"
# bulk response and verbatim strings
elif byte in (b"$", b"="):
response = self._buffer.read(int(response))
# array response
elif byte == b"*":
response = [
self._read_response(disable_decoding=disable_decoding)
for _ in range(int(response))
]
# set response
elif byte == b"~":
response = {
self._read_response(disable_decoding=disable_decoding)
for _ in range(int(response))
}
# map response
elif byte == b"%":
response = {
self._read_response(
disable_decoding=disable_decoding
): self._read_response(
disable_decoding=disable_decoding, push_request=push_request
)
for _ in range(int(response))
}
# push response
elif byte == b">":
response = [
self._read_response(
disable_decoding=disable_decoding, push_request=push_request
)
for _ in range(int(response))
]
res = self.push_handler_func(response)
if not push_request:
return self._read_response(
disable_decoding=disable_decoding, push_request=push_request
)
else:
return res
else:
raise InvalidResponse(f"Protocol Error: {raw!r}")
if isinstance(response, bytes) and disable_decoding is False:
response = self.encoder.decode(response)
return response
def set_push_handler(self, push_handler_func):
self.push_handler_func = push_handler_func
class _AsyncRESP3Parser(_AsyncRESPBase):
def __init__(self, socket_read_size):
super().__init__(socket_read_size)
self.push_handler_func = self.handle_push_response
def handle_push_response(self, response):
logger = getLogger("push_response")
logger.info("Push response: " + str(response))
return response
async def read_response(
self, disable_decoding: bool = False, push_request: bool = False
):
if self._chunks:
# augment parsing buffer with previously read data
self._buffer += b"".join(self._chunks)
self._chunks.clear()
self._pos = 0
response = await self._read_response(
disable_decoding=disable_decoding, push_request=push_request
)
# Successfully parsing a response allows us to clear our parsing buffer
self._clear()
return response
async def _read_response(
self, disable_decoding: bool = False, push_request: bool = False
) -> Union[EncodableT, ResponseError, None]:
if not self._stream or not self.encoder:
raise ConnectionError(SERVER_CLOSED_CONNECTION_ERROR)
raw = await self._readline()
response: Any
byte, response = raw[:1], raw[1:]
# if byte not in (b"-", b"+", b":", b"$", b"*"):
# raise InvalidResponse(f"Protocol Error: {raw!r}")
# server returned an error
if byte in (b"-", b"!"):
if byte == b"!":
response = await self._read(int(response))
response = response.decode("utf-8", errors="replace")
error = self.parse_error(response)
# if the error is a ConnectionError, raise immediately so the user
# is notified
if isinstance(error, ConnectionError):
self._clear() # Successful parse
raise error
# otherwise, we're dealing with a ResponseError that might belong
# inside a pipeline response. the connection's read_response()
# and/or the pipeline's execute() will raise this error if
# necessary, so just return the exception instance here.
return error
# single value
elif byte == b"+":
pass
# null value
elif byte == b"_":
return None
# int and big int values
elif byte in (b":", b"("):
return int(response)
# double value
elif byte == b",":
return float(response)
# bool value
elif byte == b"#":
return response == b"t"
# bulk response and verbatim strings
elif byte in (b"$", b"="):
response = await self._read(int(response))
# array response
elif byte == b"*":
response = [
(await self._read_response(disable_decoding=disable_decoding))
for _ in range(int(response))
]
# set response
elif byte == b"~":
response = {
(await self._read_response(disable_decoding=disable_decoding))
for _ in range(int(response))
}
# map response
elif byte == b"%":
response = {
(await self._read_response(disable_decoding=disable_decoding)): (
await self._read_response(disable_decoding=disable_decoding)
)
for _ in range(int(response))
}
# push response
elif byte == b">":
response = [
(
await self._read_response(
disable_decoding=disable_decoding, push_request=push_request
)
)
for _ in range(int(response))
]
res = self.push_handler_func(response)
if not push_request:
return await (
self._read_response(
disable_decoding=disable_decoding, push_request=push_request
)
)
else:
return res
else:
raise InvalidResponse(f"Protocol Error: {raw!r}")
if isinstance(response, bytes) and disable_decoding is False:
response = self.encoder.decode(response)
return response
def set_push_handler(self, push_handler_func):
self.push_handler_func = push_handler_func
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