polling | Portable interface to epoll , kqueue , event ports , and wepoll | Networking library

There are two issues here:

1. Oracle Database is not supported on ARM processors, only Intel. See here: https://github.com/oracle/docker-images/issues/1814
2. Oracle Database Docker images are only supported with Oracle Linux 7 or Red Hat Enterprise Linux 7 as the host OS. See here: https://github.com/oracle/docker-images/tree/main/OracleDatabase/SingleInstance

Oracle Database ... is supported for Oracle Linux 7 and Red Hat Enterprise Linux (RHEL) 7. For more details please see My Oracle Support note: Oracle Support for Database Running on Docker (Doc ID 2216342.1)

The referenced My Oracle Support Doc ID goes on to say that the database binaries in their Docker image are built specifically for Oracle Linux hosts, and will also work on Red Hat. That's it.

Because Docker provides process level virtualization it still pulls kernel and other OS libraries from the underlying host OS. A Docker image built for Oracle Linux needs an Oracle Linux host; it doesn't bring the Oracle Linux OS with it. Only Oracle Linux or Red Hat Linux are supported for any Oracle database Linux installation, with or without Docker. Ubuntu, Mac OS, Debian, or any other *NIX flavor will not provide predictable reliable results, even if it is hacked into working or the processes appear to work normally.

Browsers do not support headers for websockets, therefore the bearer token has to be added as query string parameter. We hit the maximum length for URLs due to the length of our bearer token. We could shorten our token or use a reference token, see also: https://github.com/aspnet/SignalR/issues/1266

Hope this helps others as well.

Here is the solution described again, maybe a little bit more convenient:

To fix this problem, I changed in the site-configuration (/etc/nginx/sites-available) of nginx the following variables:

The enableCors and { cors: true } options are for the HTTP server (express or fastify). The URL given showing the CORS error came from a socket.io connection. To enable CORS for socket.io you need to use the options in the @WebsocketGateway() decorator, like

According to man7.org getifaddrs, any of the socket operations could be a cause for EBADF

ERRORS

getifaddrs() may fail and set errno for any of the errors specified for socket(2), bind(2), getsockname(2), recvmsg(2), sendto(2), malloc(3), or realloc(3).

Unrelated, but do you do freeifaddrs() somewhere?

This doesn't appear to actually be an error and thus try catch won't be able to handle it for you. You'll have to get the return code and handle it with if else statements probably (switch statements would work better in this case, but I don't think python has the syntax for it).

EDIT

Following the method calls here it looks like reply_to() returns send_message(), which returns a Message object, which contains a json string set to self.json in the __init__() method. In that string you can likely find the status code (400s and 500s you can catch and deal with as you need).

Try this:

We have a PR ready for just that use-case, once we ship it, you can do:

Nodejs is very efficient with lots and lots of timers. You can easily have tens of thousands of timers with no meaningful ramifications. It uses a sorted, linked list that takes only a tiny amount of time to insert a new timer and costs nothing once inserted.

Only the next timer to fire at the start of the list is regularly compared in the event loop. When it fires, it's removed from the front of the linked list and the next timer in the list is now at the head. Because it's a linked list, the time to fire a timer and remove it from the start of the linked list is independent of how long the list is (e.g. it's not an array that has to be copied down).

So, for your specific application, it is far, far more important to be efficient with your database (as few requests as possible) than it is to minimize the number of timers. So, whichever timer design/implementation optimizes your database load is what I would recommend.

FYI, if you want to remind a user 4 times about an approaching due task, you can still only have one timer live at a time per task. Set the first timer to fire, then when it fires to notify, you do a little time calculation on the due date/time that you previously saved and see when to set the next timer for. That would leave you with just one timer per task rather than four.

But, the main point here is still that you should first optimize the design for efficient use of the database.

And, timers are not persistent so if your server restarts, you need a mechanism for recreating the appropriate timers upon server startup (probably a database query that provides you any tasks pending within a certain time).