There is a bug in pool when connection cannot be established at pool start

[langpavel]

Describe the bug

There is a bug in pool when connection cannot be established at pool start.
This bug will bite when you wish close the connection

To Reproduce

Steps to reproduce the behavior:

1. Start your deno server
2. Start your pool
3. Try to connect
4. Exception happen (good)
5. Start database
6. Try to connect
7. Do insert (OK, commited)
8. Release pool client, then
   8.5. Exception happens.
9. but query succeeds

Expected behavior

No exception

This bug is not observed when database connection is ready at start

[langpavel]

I think this is somewhere in DeferredAccessStack, but I have no proof, except this:

deno-server-1           | Insert successful
deno-server-1           | ERROR ConnectionRefused: Connection refused (os error 111)
deno-server-1           |     at async Object.connect (ext:deno_net/01_net.js:587:55)
deno-server-1           |     at async Connection.#openConnection (https://deno.land/x/postgres@v0.19.3/connection/connection.ts:266:18)
deno-server-1           |     at async Connection.#startup (https://deno.land/x/postgres@v0.19.3/connection/connection.ts:342:7)
deno-server-1           |     at async Connection.startup (https://deno.land/x/postgres@v0.19.3/connection/connection.ts:494:11)
deno-server-1           |     at async PoolClient.connect (https://deno.land/x/postgres@v0.19.3/client.ts:233:7)
deno-server-1           |     at async DeferredAccessStack.pop (https://deno.land/x/postgres@v0.19.3/utils/deferred.ts:115:7)
deno-server-1           |     at async _custom_ (file:///home/deno/fake-device/_custom_.ts:51:26)
deno-server-1           |     at async Promise.all (index 2)
deno-server-1           |     at async file:///home/deno/main.ts:17:3 {
deno-server-1           |   name: "ConnectionRefused",
deno-server-1           |   code: "ECONNREFUSED"
deno-server-1           | }

[langpavel]

This will only happen when deno service is starterd before postgres.

[langpavel]

Don't know if related, but I'm using lazy mode.