Skitai WSGI App Engine
Project description
Changes
Server configurration file is changed. You should change it
On posix installation, should give option –no-cache-dir
Introduce
Skitai WSGI App Engine (SWAE) is an daemonizer using Skitai.
SWAE is a kind of branch of Medusa Web Server - A High-Performance Internet Server Architecture.
Medusa is different from most other servers because it runs as a single process, multiplexing I/O with its various client and server connections within a single process/thread.
Working as Web, XML-RPC and Reverse Proxy Loadbancing Server
HTML5 Websocket & HTTP/2.0 Implemeted
Multiple Worker Processes (Posix Only)
Installation / Startup
On Posix
sudo pip install --no-cache-dir skitaid
sudo skitaid.py -v &
sudo skitaid.py stop
;if everythig is OK,
sudo service skitaid start
#For auto run on boot,
sudo update-rc.d skitaid defaults
or
sudo chkconfig skitaid on
Option ‘–no-cache-dir’ is should be given, otehrwise installation is not workigng. I don’t know why.
On Win32
pip install skitaid
cd c:\skitaid\bin
skitaid.py -v
skitaid.py stop (in another command prompt)
;if everythig is OK,
install-win32-service.py install
#For auto run on boot,
install-win32-service.py --startup auto install
install-win32-service.py start
Mounting WSGI Apps and Static Directories
Here’s three WSGI app samples:
WSGI App at /var/wsgi/wsgiapp.py
def app (env, start_response):
start_response ("200 OK", [("Content-Type", "text/plain")])
return ['Hello World']
Flask App at /var/wsgi/flaskapp.py
from flask import Flask
app = Flask(__name__)
@app.route("/")
def index ():
return "Hello World"
Skitai-Saddle App at /var/wsgi/skitaiapp.py
from skitai.saddle import Saddle
app = Saddle (__name__)
@app.route('/')
def index (was):
return "Hello World"
For mounting to SWAE, modify config file in /etc/skitaid/servers-enabled/example.conf
[routes:line]
; for files like images, css
/ = /var/wsgi/static
; app mount syntax is path/module:callable
/ = /var/wsgi/wsgiapp:app
/aboutus = /var/wsgi/flaskapp:app
/services = /var/wsgi/skitaiapp:app
You can access Flask app from http://127.0.0.1:5000/aboutus and other apps are same.
Note: Mount point & App routing
If app is mounted to ‘/flaskapp’,
from flask import Flask
app = Flask (__name__)
@app.route ("/hello")
def hello ():
return "Hello"
Above /hello can called, http://127.0.0.1:5000/flaskapp/hello
Also app should can handle mount point. In case Flask, it seems ‘url_for’ generate url by joining with env[“SCRIPT_NAME”] and route point, so it’s not problem. Skitai-Saddle can handle obiously. But I don’t know other WSGI middle wares will work properly.
Configuration / Management
Now let’s move on to new subject about server configuration amd mainternance.
Configuration
Configuration files are located in ‘/etc/skitaid/servers-enabled/*.conf’, and on win32, ‘c:\skitaid\etc\servers-enabled/*.conf’.
Basic configuration is relatively simple, so refer commets of config file. Current config file like this:
[server]
threads = 4
processes = 2
ip = 127.0.0.1
port = 5000
name =
[ssl]
ssl = no
certfile = server.pem
keyfile =
pass_phrase =
[proxy]
enable_proxy = no
[performance]
static_max_age = 300
response_timeout = 10
keep_alive = 10
num_result_cache_max = 200
[proxypass]
cache_memory = 8
cache_disk = 0
[etc]
blacklist_dir =
[routes:line]
/ = /var/wsgi/example/static
/ = /var/wsgi/example/webapp
/about = @python
[@python]
ssl = yes
members = www.python.org:443
[@sqlite3]
type = sqlite3
members = /var/wsgi/example/resources/sqlite3.db
Here’s configs required your carefulness.
processes: number of workers but on Win32, only 1 is valid
threads: generally not up to 4 per CPU. If set to 0, Skitai run with entirely single thread. so be careful if your WSGI function takes long time or possibly will be delayed by blocking operation.
num_result_cache_max: number of cache for HTTP/RPC/DBMS results
response_timeout: transfer delay timeout caused by network problem
Mounting With Virtual Host
New in version 0.10.5
App can be mounted with virtual host.
[routes:line]
/ = /home/user/www/static
/ = /home/user/www/wsig:app
# exactly matching host
@ www.mydomain.com mydomain.com
/ = /home/user/mydomain.www/static
/service = /home/user/mydomain.www/wsgi:app
# matched *.mydomain.com include mydomain.com
@ .mydomain.com
/ = home/user/mydomain.any/static
/ = home/user/mydomain.any/wsgi:app
# matched *.mydomain2.com except mydomain2.com
@ *.mydomain.com
/ = home/user/mydomain2.any/static
/ = home/user/mydomain2.any/wsgi:app
As a result, the app location ‘/home/user/mydomain.www/wsgi.py’ is mounted to ‘www.mydomain.com/service’ and ‘mydomain.com/service’.
Log Files
If Skitai run with skitaid.py, there’re several processes will be created.
Sample ps command’s result is:
ubuntu:~/skitai$ ps -ef | grep skitaid
root 19146 19145 0 Mar03 pts/0 00:00:11 /usr/bin/python /usr/local/bin/skitaid.py
root 19147 19146 0 Mar03 pts/0 00:00:05 /usr/bin/python /usr/local/bin/skitaid-smtpda.py
root 19148 19146 0 Mar03 pts/0 00:00:03 /usr/bin/python /usr/local/bin/skitaid-cron.py
root 19150 19146 0 Mar03 pts/0 00:00:00 /usr/bin/python /usr/local/bin/skitaid-instance.py --conf=example
/usr/local/bin/skitaid.py : Skitaid Daemon manages all Skitais sub processes
/usr/local/bin/skitaid-instance.py : Skitai Instance with example.conf
/usr/local/bin/skitaid-smtpda.py : SMTP Delivery Agent
/usr/local/bin/skitaid-cron.py : Cron Agent
Skitai Daemon log file is located at:
posix: /var/log/skitaid/skitaid.log
win32: c:\skitaid\log\skitaid.log
To view latest 16Kb log,
skitaid.py log
SMTP Delivery Agent log is located at:
posix: /var/log/skitaid/daemons/smtpda/smtpda.log
win32: c:\skitaid\log\daemons\smtpda\smtpda.log
skitaid.py -f smtpda log
Cron Agent log is located at:
posix: /var/log/skitaid/daemons/cron/cron.log
win32: c:\skitaid\log\daemons\cron\cron.log
skitaid.py -f cron log
If Skitai App Engine Instances config file is ‘example.conf’, log file located at:
posix: /var/log/skitaid/instances/example/[server|request|app].log
win32: c:\skitaid\log\instances\example\[server|request|app].log
skitaid.py -f cron -s [server|request|app] log
To view lateset log,
skitaid.py -f example log
Above log is like this:
2016.03.03 03:37:41 [info] called index
2016.03.03 03:37:41 [error] exception occured
2016.03.03 03:37:41 [expt:bp1] <type 'exceptions.TypeError'>\
index() got an unexpected keyword argument 't'\
[/skitai/saddle/wsgi_executor.py|chained_exec|51]
2016.03.03 03:37:41 [info] done index
Batch Task Scheduler
New in version 0.14.5
Sometimes app need batch tasks for minimum response time to clients. At this situateion, you can use taks scheduling tool of OS - cron, taks scheduler - or can use Skitai’s batch task scheduling service for consistent app management. for this, add jobs configuration to skitaid.conf (/etc/skitaid/skitaid.conf or c:\skitaid\etc\skitaid.conf) like this.
[crontab:line]
*/2 */2 * * * /home/apps/monitor.py > /home/apps/monitor.log 2>&1
9 2/12 * * * /home/apps/remove_pended_files.py > /dev/null 2>&1
Taks configuarion is same with posix crontab.
Cron log file is located at /var/log/skitaid/daemons/cron/cron.log or c:skitaidlogdaemonscroncron.log
Running Skitai as HTTPS Server
Simply config your certification files to config file (ex. /etc/skitaid/servers-enabled/example.conf).
[server]
ssl = yes
; added new key
certfile = server.pem
; you can combine to certfile
; keyfile = private.key
; passphrase =
To genrate self-signed certification file:
openssl req -new -newkey rsa:2048 -x509 -keyout server.pem -out server.pem -days 365 -nodes
For more detail please read REAME.txt in /etc/skitaid/cert/README.txt
Note For Python 3 Users
Posix
SWAE will be executed with /usr/bin/python (mostly symbolic link for /usr/bin/python2).
For using Python 3.x, change skitaid scripts’ - /usr/local/bin/sktaid*.py - first line from #!/usr/bin/python to #!/usr/bin/python3. Once you change, it will be kept, even upgrade or re-install skitai.
In this case, you should re-install skitai and requirements using ‘pip3 install …’.
Win32
Change python key value to like c:\python34\python.exe in c:\skitaid\etc\skitaid.conf.
Skitai with Nginx / Squid
From version 0.10.5, Skitai supports virtual hosting itself, but there’re so many other reasons using with reverse proxy servers.
Here’s some helpful sample works for virtual hosting using Nginx / Squid.
If you want 2 different and totaly unrelated websites:
www.jeans.com
www.carsales.com
And make two config in /etc/skitaid/servers-enabled
jeans.conf using port 5000
carsales.conf using port 5001
Then you can reverse proxying using Nginx, Squid or many others.
Example Squid config file (squid.conf) is like this:
http_port 80 accel defaultsite=www.carsales.com
cache_peer 192.168.1.100 parent 5000 0 no-query originserver name=jeans
acl jeans-domain dstdomain www.jeans.com
http_access allow jeans-domain
cache_peer_access jeans allow jeans-domain
cache_peer 192.168.1.100 parent 5001 0 no-query originserver name=carsales
acl carsales-domain dstdomain www.carsales.com
http_access allow carsales-domain
cache_peer_access carsales allow carsales-domain
For Nginx might be 2 config files (I’m not sure):
; /etc/nginx/sites-enabled/jeans.com
server {
listen 80;
server_name www.jeans.com;
location / {
proxy_pass http://192.168.1.100:5000;
}
}
; /etc/nginx/sites-enabled/carsales.com
server {
listen 80;
server_name www.carsales.com;
location / {
proxy_pass http://192.168.1.100:5001;
}
}
Links
Bug Report: GitLab issues
Change Log
0.1
seperated from Skitai
0.3
Server configurration file is changed. You should change it
On posix installation, should give option –no-cache-dir
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