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@akx Thank you so much for this! Thanks again for introducing me to a new tool that I'm sliding into my workflow as well.
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Remove support for end-of-life Python 2.7
Python 2.7 is end of life. It is no longer receiving bug fixes,
including for security issues. Python 2.7 went EOL on 2020-01-01. For
additional details on support Python versions, see:
Supported: https://devguide.python.org/#status-of-python-branches
EOL: https://devguide.python.org/devcycle/#end-of-life-branches
Removing support for EOL Pythons will reduce testing and maintenance
resources while allowing the library to move towards a modern Python 3
style. Python 2.7 users can continue to use the previous version of
redis-py.
Was able to simplify the code:
- Removed redis._compat module
- Removed __future__ imports
- Removed object from class definition (all classes are new style)
- Removed long (Python 3 unified numeric types)
- Removed deprecated __nonzero__ method
- Use simpler Python 3 super() syntax
- Use unified OSError exception
- Use yield from syntax
Co-authored-by: Andy McCurdy <andy@andymccurdy.com>
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Better thread and fork safety for ConnectionPool and BlockingConnectionPool
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While numbers are frequently singletons as an optimization, it is not
guaranteed by the language specification. Fixes flake8 error:
F632 use ==/!= to compare str, bytes, and int literals
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Sometimes a process with an active connection to Redis forks and creates
child processes taht also want to talk to Redis. Prior to this change there
were a number of potential conflicts that could cause this to fail.
Retrieving a connection from the pool and releasing a connection back
to the pool check the current proceeses PID. If it's different than the
PID that created the pool, reset() is called to get a fresh set of connections
for the current process. However in doing so, pool.disconnect() was caused
which closes the file descriptors that the parent may still be using. Further
when the available_connections and in_use_connections lists are reset, all of
those connections inherited from the parent are GC'd and the connection's
`__del__` was called, which also closed the socket and file descriptor.
This change prevents pool.disconnect() from being called when a pid is changed.
It also removes the `__del__` destructor from connections. Neither of these
are necessary or practical. Child processes still reset() their copy of the
pool when first accessed causing their own connections to be created.
`ConnectionPool.disconnect()` now checks the current process ID
so that a child or parent can't disconnect the other's connections.
Additionally, `Connection.disconnect()` now checks the current process ID
and only calls `socket.shutdown()` if `disconnect()` is called by the same
process that created the connection. This allows for a child process that
inherited a connection to call `Connection.disconnect()` and not shutdown
the parent's copy of the socket.
Fixes #863
Fixes #784
Fixes #732
Fixes #1085
Fixes #504
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implementation/behavior (related to #1085).
When hiredis is installed and HiredisParser is used (implicitly),
connection can not be securily shared between process forks.
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