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Lock based leadership #606

Merged
merged 12 commits into from
Dec 30, 2021
Merged

Lock based leadership #606

merged 12 commits into from
Dec 30, 2021

Commits on Dec 30, 2021

  1. Naive senator module for centralized leadership

    @sorentwo
    sorentwo committed Dec 30, 2021
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  2. Migrate notifier to connection callback module 

    An in-progress notifications update allows injecting a callback module
into `Postgrex.Notifications`. The callback can handle listeners and
notifications however the application requires, and more importantly,
it allows running arbitrary queries.

By switching to our own notification implementation we get control over
relaying messgaes to subscribers (rather than proxying them all through
the connection) and keep a persistent connection for leadership
elections.
    @sorentwo
    sorentwo committed Dec 30, 2021
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  3. Use a persistent connection for senator elections

    @sorentwo
    sorentwo committed Dec 30, 2021
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  4. Senator election property tests and improvements

    @sorentwo
    sorentwo committed Dec 30, 2021
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  5. Point to github branch for postgrex changes

    @sorentwo
    sorentwo committed Dec 30, 2021
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  6. Missing connection functionality and small fixes

    @sorentwo
    sorentwo committed Dec 30, 2021
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  7. Remove circuit breaker docs, functions, and config 

    The last remaining circuit breaker was used in the Postgres notifier,
which no longer manages its own connection. Instead, the persistent
connection manages auto reconnection by itself and between the
`Connection.connected?` and `Senator.leader?` callbacks, plugins or
other connection sensitve code can tailor behavior.
    @sorentwo
    sorentwo committed Dec 30, 2021
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  8. Additional notifier tests and logical fixes

    @sorentwo
    sorentwo committed Dec 30, 2021
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  9. Consider connection status for leadership checks

    @sorentwo
    sorentwo committed Dec 30, 2021
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  10. Use leader check instead of xact lock for plugins

    @sorentwo
    sorentwo committed Dec 30, 2021
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  11. Update Connection to use postgrex SimpleConnection

    @sorentwo
    sorentwo committed Dec 30, 2021
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  12. Switch postgrex to upstream main branch

    @sorentwo
    sorentwo committed Dec 30, 2021
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