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Allow schema cache reloading with NOTIFY (#1542)

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Fixes https://github.com/PostgREST/postgrest/issues/1512

Helps on environments where you can't send unix signals(Windows, managed
containers). Also provides better UX for schema reloads - NOTIFY
can be sent from pg clients(psql, pgadmin).

`NOTIFY pgrst` - with no payload - should be done to reload the schema cache.
Notifications with a payload will be ignored.

The channel can be enabled with `db-channel-enabled`(false by default)
and its name can be configured with `db-channel`.

The LISTEN thread uses a dedicated pg connection.
This connection is recovered if it fails.
A debounce of 1ms is done in case too many NOTIFYs arrive.
This commit is contained in:
Steve Chavez
2020-06-24 19:00:02 -05:00
committed by GitHub
parent 24064f8626
commit 43d71e95ac
13 changed files with 169 additions and 57 deletions
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stack.yaml
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@@ -12,3 +12,4 @@ extra-deps:
- hspec-wai-json-0.10.1@sha256:67b405c38f0a9e2771480c8d3ecd8aeb8d8776a35d3b2906cb1b76c9538617e4,1629
- interpolatedstring-perl6-1.0.2@sha256:7ce49c8a69a2a1b89c001ed79db2aab656ffd0faf2a7a701a553b6deb5c8ba7f,1073
- protolude-0.3.0@sha256:8361b811b420585b122a7ba715aa5923834db6e8c36309bf267df2dbf66b95ef,2693
- hasql-notifications-0.1.0.0@sha256:9ab112d2bb5da0d55abd65f0d27a7bb1dc4aeb792518d9a2ea8a16e243e19985,2156