Enforce CLIENT_DEPRECATE_EOF capability match for fast-forward sessions
#4819
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- Ensures matching for 'CLIENT_DEPRECATE_EOF' capability when creating or acquiring backend conns for 'fast-forward' sessions. - Since 'CLIENT_DEPRECATE_EOF' capability isn't enforced on backend connections for regular sessions, a mismatch between client and backend capabilities is possible. A verification has been introduced when a session switches to 'fast-forward', in case of capabilities mismatch, an error is logged and client disconnected.
…lclient' Using both libraries allows to test the compatibility of 'fast-forward' sessions for SQLite3 sessions.
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This PR ensures that a mismatch between frontend and backend connections can't take place for
CLIENT_DEPRECATE_EOFcapability. This is enforced with checks for two different scenarios:or acquiring backend conns for 'fast-forward' sessions.
connections for regular sessions, a mismatch between client and
backend capabilities is possible. A verification has been introduced
when a session switches to 'fast-forward', in case of capabilities
mismatch, an error is logged and client disconnected.
This PR also introduced a test that can serve as a guide when further testing capabilities matching. The test design is based is based on possibilities exploration on the scenarios that can be found in the connection pool. The higher degree of verbosity of the test can also serve as reference for other tests that require inspecting many
ProxySQLinternals for their checks.