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2 points by markkat 871 days ago | link | parent

Hey Kartik!

It's a new project. However, Hubski has been using postgres for a few years, but it's currently an amalgam of Arc and Racket. I didn't write the db code, and am trying to start fresh. The Hubski racket connection looks like:

  (define db-conn
    (lambda () (postgresql-connect
           #:user db-user
           #:password db-pass
           #:database db-database
           #:server db-server

  (define db-user     "user")
  (define db-pass     "password")
  (define db-database "hubski")
  (define db-server   "localhost")
>Can you show what command you're running to check that you "can connect to the db from the Arc command line"?

Here's my test code that works in the command line, and the response. (I named my db "root" atm and will change that and the user once I get it working. I'm running the app as root.):

  arc> (tostring (pipe-to (system "psql -U root -d root") (prn "SELECT * FROM items WHERE name = 'marble';"))                                     )
  " item_id |  name  | type |             description             |          created           |                                                           
  location                      \n---------+--------+------+-------------------------------------+--                                     ------------ 
  --------------+----------------------------------------------------\n       1 | marble | tool | A small, translucent orange bauble. | 2022-02-23 
  17:59:45.480545 | 0101000020E610000012C2A38D239A5EC040683D7C99E44240\n(1 row)\n\n"
But when I have that same code in the app, it times out. I tried to add (prn "\\q") at the end, but same result. Works in command line but hangs up in the app.

I even tried to specify the host and port:

  (pipe-to (system "psql -U root -h -p 5432 -d root") (prn "SELECT * FROM items WHERE name = 'marble';"))
With this in my pg_hba.conf

  host    all             root        trust
And the same result; returns in command, app times out. Checked the port:

  root@Xyrth:/home/xapp# netstat -tulnp | grep 5432
  tcp        0      0*               LISTEN      124232/postgres
Thanks for the quick reply!

BTW, I am using the domain with a nginx reverse proxy. I just had the thought it may be my nginx configuration. It probably needs to listen explicity on 5432? Here's my current sites-enabled:

  server {
    listen 80;
    return 301$request_uri;

  server {
    	listen              443 ssl;
        ssl_certificate "/etc/letsencrypt/live/";
        ssl_certificate_key "/etc/letsencrypt/live/";
        ssl_session_cache shared:SSL:5m;
        ssl_session_timeout  10m;

        proxy_redirect      off;
        proxy_set_header    X-Real-IP $remote_addr;
        proxy_set_header    X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header    Host $http_host;

        location / {
                proxy_buffers 16 4k;
                proxy_buffer_size 2k;
		proxy_set_header Host;

        location ~* \.(png|jpg|tif|ico|ttf|woff|svg|eot|otf|mp3|ogg|wav)$ {
        root /home/xapp/static;
        expires max;

        location ~ ^/(xyrth.css) {
                root /home/xapp/static;
                expires max;


1 point by markkat 870 days ago | link

Killing me. I don't think it's nginx..

Maybe it isn't disconnecting?

  (tostring (system "psql -V"))

  psql (PostgreSQL) 12.9 (Ubuntu 12.9-0ubuntu0.20.04.1)
just fine from the app.