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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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nix/docker/default.nix
+2
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@@ -29,6 +29,8 @@ let
"PGRST_DB_POOL=100"
"PGRST_DB_POOL_TIMEOUT=10"
"PGRST_DB_EXTRA_SEARCH_PATH=public"
"PGRST_DB_CHANNEL=pgrst"
"PGRST_DB_CHANNEL_ENABLED=false"
"PGRST_SERVER_HOST=*4"
"PGRST_SERVER_PORT=3000"
"PGRST_OPENAPI_SERVER_PROXY_URI="