A simple snappy Ubuntu python webserver

In the previous article, we've covered how to use Golang to create our webserver. In today's article, let's explain how to use Python to create a simple webserver on snappy Ubuntu. If you are not familiar with the snapcraft we use, please refer to the article "Use Snapcraft for our snappy Ubuntu application package". If you have a snap packet on ARM devices, please refer to the article "How to Compile and Package snap (2) for our snappy Ubuntu application."

1 Create our simple Python webserver

We can refer to some simpler Python webserver code. There's a lot of code on the Web. Today we are using one of these options:
server.py

#!/usr/bin/python from
basehttpserver import basehttprequesthandler,httpserver

port_number = 8080

#This Class would handles any incoming the request from
#the browser 
class MyHandler (Basehttprequesthandler):
	
	# Handler for the Get requests
	def do_get (self):
		self.send_response
		self.send_header (' Content-type ', ' text/html ')
		self.end_headers ()
		# Send The HTML message
		self.wfile.write ("Hello world!")
		Return

try:
	#Create a Web server and define the handler to manage the
	#incoming request
	Server = HTTPS  Erver ((', port_number), MyHandler)
	print ' started httpserver on PORT ', Port_number
	
	#Wait forever for incoming Htto requests
	Server.serve_forever ()

except keyboardinterrupt:
	print ' ^c received, shutting down the Web server '
	server.socket.close ()
	

We can enter the following command directly in our terminal:

$ python server.py 
started httpserver on port  8080

If in our browser, we can access the address directly:

Obviously our webserver is running. In the next section, we'll pack the Python server into our snap.

2) Making Python webserver snap
In this section, we show how to make a Python webserver snap. First, we'll create our Snapcraft.yaml file in the same way that the article "uses Snapcraft to package our snappy Ubuntu apps". Our documentation is as follows:
Snapcraft.yaml

Name:pythonserver
version:1.0
Vendor:xiaoguo, Liu <xiaoguo.liu@canonical.com>
summary:a Simple Python server
description:this is the webserver API in Python demo
icon:icon.png

services:
  mywebserver :
    Description: "A webserver in Python"
    start:bin/server 
    caps:
     -network-client
     - Network-service

Parts:
  server:
    plugin:python3
    Source:.

  Source:
    plugin:copy
    files:
     ./server.py:bin/server

Here, we use parts to install the Python runtime environment we need, and we also take our server.py to where we need it. Our Python webserver will run in a service way. Our entire project source code in the following address can be found:

Https://github.com/liu-xiao-guo/pythonserver

We have entered the following command in Termial to package:

$ snapcraft

So we can produce the snap package we need.

liuxg@liuxg:~/snappy/examples/pythonserver$ ls 
icon.png  parts  pythonserver_1.0_amd64.snap  server.py  snap  Snapcraft.yaml  Stage

We can deploy it to our KVM environment:

(AMD64) ubuntu@localhost:~$ snappy list-v
Name           Date       Version      Developer  
ubuntu-core    2015-11-13           ubuntu*    
ubuntu-core    2015-10-23 9            ubuntu     
config-example 2015-11-30 Igbdlsndorod sideload*  
Hello-xiaoguo  2015-11-05 ieenefbrvyge sideload   
Hello-xiaoguo  2015-11-27 Igtctdaicyol sideload*  
pastebinit     2015-11-02 1.4.0.0.2 mvo* pythonserver   2015-12-09 IHQDDRKVUAJC sideload   
pythonserver   2015-12-09 ihqdjgyaasyy sideload*  
restapi        2015-12-07 IHMFUOGUERWG sideload*  
snappy-debug   2015-12-07 0.7 canonical* webdm          2015-10-23 0.9.2        canonical* 
generic-amd64  2015-10-23 1.4          canonical* 
(AMD64) ubuntu@localhost:~$ sudo Snappy Service Status
Snap		service		State
pythonserver	mywebserver	enabled; loaded; Active (running)
WEBDM		snappyd		enabled; loaded; active (running)

We can use our browser for testing. You can see a simple Python webserver like the one above.