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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/patches/default.nix
+3
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@@ -31,4 +31,7 @@
# https://github.com/nh2/static-haskell-nix/pull/91
static-haskell-nix-postgrest-openssl-linking-fix =
./static-haskell-nix-postgrest-openssl-linking-fix.patch;
static-haskell-nix-hasql-notifications-openssl-linking-fix =
./static-haskell-nix-hasql-notifications-openssl-linking-fix.patch;
}