X-Sendfile

denc19

Hi,

I have a Django application that uses X-Sendfile to serve static files to users, provided that they are authorized to access the files. On Webfaction this was handled through Apache, after enabling mod_xsendfile in the configuration.

I want to have something similar on Opalstack. As I understand it, Opalstack uses a barebones uWSGI server. Do I understand correctly that this means that it runs without Apache or nginx on the background as the actual web server?

Most articles I have found through Googling give instructions for setting up X-Sendfile on Apache or nginx, not uWSGI. Could you help me set this up on uWSGI, or point me in the right direction?

Thanks!

sean

denc19 Our uwsgi install sets up uwsgi running as a standalone HTTP server, proxied behind our main front-end Nginx server. We don't have configurable options for the front-end server at this time but we may add them in the future.

For now, there's a sendfile example in the uwsgi docs that might help you: X-Sendfile emulation

Edit: don't include plugins = router_static in your uwsgi config, it's now baked into uwsgi and trying to add the plugin will break your uwsgi.

denc19

Alright I'll look into that, thanks

denc19

I followed the instructions from X-Sendfile emulation. I edited uwsgi.ini and changed the configuration to include the following:

[uwsgi] ... ; load router_static plugin (compiled in by default in monolithic profiles) plugins = router_static ; spawn 2 offload threads offload-threads = 2 ; files under /private can be safely served static-safe = [my_django_dir]/private ; collect the X-Sendfile response header as X_SENDFILE var collect-header = X-Sendfile X_SENDFILE ; if X_SENDFILE is not empty, pass its value to the "static" routing action (it will automatically use offloading if available) response-route-if-not = empty:${X_SENDFILE} static:${X_SENDFILE}

When I tried to start the server I got the following error message:

open("./router_static_plugin.so"): No such file or directory [core/utils.c line 3732] !!! UNABLE to load uWSGI plugin: ./router_static_plugin.so: cannot open shared object file: No such file or directory !!!

I tried to solve this by specifying the plugins-dir.

[uwsgi] ... plugins-dir = /usr/lib/uwsgi ...

I also tried some variations of the path.

/usr/lib64/uwsgi /usr/lib/uwsgi/plugins /usr/lib64/uwsgi/plugins

Unfortunately, this still did not fix my problem.

open("/usr/lib/uwsgi/router_static_plugin.so"): No such file or directory [core/utils.c line 3732] open("./router_static_plugin.so"): No such file or directory [core/utils.c line 3732] !!! UNABLE to load uWSGI plugin: ./router_static_plugin.so: cannot open shared object file: No such file or directory !!!

How can I fix this problem? Did I include the wrong plugins-dir or is the plugin simply not available?

sean

denc19 the plugin should be available by default. I didn't have any errors when I enabled it in my own testing.

Please try reinstalling uwsgi in your app like:

source ~/apps/appname/env/bin/activate
pip install --upgrade  --force-reinstall uwsgi

Then restart your app to see if that helps. If it doesn't then please contact support to let us know your shell user and app and we'll look into it.

cameron

Hey @sean, I have the same problem as @denc19. I've force-reinstalled uwsgi as you suggested (to version uwsgi-2.0.19.1), then added plugins = router_static to my uwsgi.py file. I get the following:

(env) [cornerstone@opal2 django]$ ./start
[uWSGI] getting INI configuration from /home/cornerstone/apps/django/uwsgi.ini
open("./router_static_plugin.so"): No such file or directory [core/utils.c line 3732]
!!! UNABLE to load uWSGI plugin: ./router_static_plugin.so: cannot open shared object file: No such file or directory !!!
Started uWSGI for django.

Any ideas on where we could get that router_static_plugin.so file? You mentioned that plugin was working on your test account--can you work out where it's getting that file from on that?

I've also tried (in vain) to use X-Accel-Redirect directly, with the following in uwsgi.ini:

file-serve-mode = x-accel-redirect
static-safe = /directory/containing/static/files/to/be/served

When I include a X-Accel-Redirect header containing the path of the file to be served, I just get an empty response. So obviously that's not the right way to go.

sean

cameron take plugins = router_static out of your config, it's baked in to latest uwsgi so there's no plugin to load.

cameron

Ah I see!! Thanks @sean, that worked perfectly! Very much appreciated 😀

sdegrace

Thanks, this solved a major problem for me and also worked perfectly on the first try!