Difference between revisions of "Short Notes on Python"
From PaskvilWiki
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# use your commons.py module now... | # use your commons.py module now... | ||
commons.super_function()</nowiki> | commons.super_function()</nowiki> | ||
| + | |||
| + | == uWSGI, nginx, Flask == | ||
| + | |||
| + | * install uwsgi (incl. uwsgi python plugin), python flask, and nginx, | ||
| + | |||
| + | === Setting Up uWSGI === | ||
| + | |||
| + | * create ''main.py'' file that will hold the server logic, for instance: | ||
| + | <pre>from flask import Flask | ||
| + | |||
| + | app = Flask(__name__) | ||
| + | |||
| + | |||
| + | @app.route("/") | ||
| + | def hello(): | ||
| + | return "hello there!"</pre> | ||
| + | * create uwsgi config file, ''wsgi.ini'' ('''minimal''' version here; read uwsgi docs for head-spinning array of configurables): | ||
| + | <pre>[uwsgi] | ||
| + | module = wsgi:app | ||
| + | master = true | ||
| + | processes = 5 | ||
| + | socket = 127.0.0.1:8000 | ||
| + | protocol = http | ||
| + | plugin = python</pre> | ||
| + | * run uwsgi | ||
| + | uwsgi --ini wsgi.ini | ||
| + | * check that all works on http://localhost:8000/ | ||
| + | |||
| + | === Adding nginx Layer === | ||
| + | |||
| + | * remove the "protocol" directive from ''wsgi.ini'', and add "die-on-term": | ||
| + | <pre>[uwsgi] | ||
| + | module = wsgi:app | ||
| + | master = true | ||
| + | processes = 5 | ||
| + | socket = 127.0.0.1:8000 | ||
| + | plugin = python | ||
| + | die-on-term = true</pre> | ||
| + | * add a new vhost to nginx - ''/etc/nginx/sites-available/app.nginx'': | ||
| + | <pre>server { | ||
| + | listen 80; | ||
| + | server_name my.awesome.domain; | ||
| + | location / { | ||
| + | include uwsgi_params; | ||
| + | uwsgi_pass 127.0.0.1:8000; | ||
| + | } | ||
| + | }</pre> | ||
| + | ** communication through socket is also possible (see ''socket'', ''chmod-socket'', ''vacuum'' and other directives for uWSGI) | ||
| + | ** of course, create link in ''/etc/nginx/sites-enabled/'', and restart nginx, | ||
| + | * create ''systemd'' file for uWSGI, ''/etc/systemd/system/uwsgi-app.service'': | ||
| + | <pre>[Unit] | ||
| + | Description=Job that runs the uWSGI app | ||
| + | |||
| + | [Service] | ||
| + | Type=simple | ||
| + | WorkingDirectory=/home/project/flask-test/ | ||
| + | ExecStart=/usr/bin/uwsgi --ini wsgi.ini</pre> | ||
Revision as of 16:17, 8 July 2016
Contents
Timing, and memory, on Linux
Timing
On Linux, it's safer to use time.time()
import time t = time.time() # do some stuff print "stuff took %1.3f", time.time() - t, "seconds"
On Windows, AFAIK, it's safer to use time.clock()
Memory
For me, the following does a good job getting memory usage (in kB) on Linux:
import resource print resource.getrusage(resource.RUSAGE_SELF).ru_maxrss
Since resource is standard package, it should work on Windows too, but I don't know if it does, or what units are used if it works.
Importing Files
If you need to import a file '../mylib/commons.py', you can use the following snippet:
import sys, os
fld = os.path.realpath(os.path.abspath(os.path.join('..', 'mylib')))
if fld not in sys.path:
sys.path.insert(0, fld)
import commons
# use your commons.py module now...
commons.super_function()
uWSGI, nginx, Flask
- install uwsgi (incl. uwsgi python plugin), python flask, and nginx,
Setting Up uWSGI
- create main.py file that will hold the server logic, for instance:
from flask import Flask
app = Flask(__name__)
@app.route("/")
def hello():
return "hello there!"
- create uwsgi config file, wsgi.ini (minimal version here; read uwsgi docs for head-spinning array of configurables):
[uwsgi] module = wsgi:app master = true processes = 5 socket = 127.0.0.1:8000 protocol = http plugin = python
- run uwsgi
uwsgi --ini wsgi.ini
- check that all works on http://localhost:8000/
Adding nginx Layer
- remove the "protocol" directive from wsgi.ini, and add "die-on-term":
[uwsgi] module = wsgi:app master = true processes = 5 socket = 127.0.0.1:8000 plugin = python die-on-term = true
- add a new vhost to nginx - /etc/nginx/sites-available/app.nginx:
server {
listen 80;
server_name my.awesome.domain;
location / {
include uwsgi_params;
uwsgi_pass 127.0.0.1:8000;
}
}
- communication through socket is also possible (see socket, chmod-socket, vacuum and other directives for uWSGI)
- of course, create link in /etc/nginx/sites-enabled/, and restart nginx,
- create systemd file for uWSGI, /etc/systemd/system/uwsgi-app.service:
[Unit] Description=Job that runs the uWSGI app [Service] Type=simple WorkingDirectory=/home/project/flask-test/ ExecStart=/usr/bin/uwsgi --ini wsgi.ini
