Created
May 27, 2017 05:18
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HTTP server with python
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| import RPi.GPIO as GPIO | |
| class Led: | |
| def __init__(self, pin): | |
| self.pin = pin | |
| self.s = 0 | |
| GPIO.setmode(GPIO.BOARD) | |
| GPIO.setup(self.pin, GPIO.OUT) | |
| def __del__(self): | |
| GPIO.cleanup(self.pin) | |
| def state(self, s): | |
| self.s = s | |
| if s == '0': | |
| GPIO.output(self.pin, GPIO.LOW) | |
| else: | |
| GPIO.output(self.pin, GPIO.HIGH) |
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| # -*- coding:utf-8 -*- | |
| import BaseHTTPServer | |
| import socket | |
| import cgi | |
| from led import Led | |
| def get_ip_address(): | |
| """ get ip address of active network interface """ | |
| s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) | |
| s.connect(("8.8.8.8", 80)) | |
| addr = s.getsockname()[0] | |
| s.close() | |
| return addr | |
| class TestHandler(BaseHTTPServer.BaseHTTPRequestHandler): | |
| """ Simple HTTP server | |
| This site has RESTful API for L-Chika. | |
| UI page for TEST | |
| /ui.html This page has UI for API test. | |
| API as follows: | |
| /api/led | |
| state 0 or 1 | |
| """ | |
| html = """ | |
| <html> | |
| <head> | |
| <title>service UI</title> | |
| <style type="text/css"> | |
| <!-- | |
| button { | |
| font-size: 1.4em; | |
| width: 40%; | |
| height: 10%; | |
| padding: 10px; | |
| margin: 10px; | |
| } | |
| //--> | |
| </style> | |
| </head> | |
| <body> | |
| <p>LED | |
| <form action="http://@HOST@:8000/api/led" method="post"> | |
| <button type='submit' name='state' value='1'>Hi</button> | |
| <button type='submit' name='state' value='0'>Lo</button> | |
| </form></p> | |
| </body> | |
| </html> | |
| """ | |
| html = html.replace('@HOST@', get_ip_address()) | |
| led = Led(40) | |
| def do_GET(self): | |
| # ignore request to favicon | |
| if self.path.endswith('favicon.ico'): | |
| return | |
| # visited to ui.html, return html. | |
| if self.path.endswith('ui.html'): | |
| self.send_response(200) | |
| self.end_headers | |
| self.wfile.write(self.html) | |
| return | |
| # otherwise return 404 not found | |
| self.send_response(404) | |
| self.end_headers() | |
| self.wfile.write("not found") | |
| def do_POST(self): | |
| # get the form data | |
| form = cgi.FieldStorage( | |
| fp=self.rfile, | |
| headers=self.headers, | |
| environ={'REQUEST_METHOD': 'POST', | |
| 'CONTENT_TYPE': self.headers['Content-Type'], }) | |
| # check path | |
| if self.path.endswith('/api/led'): | |
| self.process_post_header() | |
| # do something... | |
| self.led.state(form["state"].value) | |
| print "Received %s" % form["state"].value | |
| return | |
| # otherwise return 404 not found | |
| self.send_response(404) | |
| self.end_headers() | |
| self.wfile.write("not found") | |
| def process_post_header(self): | |
| # get the referer | |
| referer = self.headers.get('Referer') | |
| # if visited from ui.html, redirect to referer URI | |
| if referer.endswith('ui.html'): | |
| self.send_response(301) | |
| self.send_header('Location', referer) | |
| else: | |
| self.send_response(200) | |
| self.end_headers() | |
| self.wfile.write(self.html) | |
| server_address = ('', 8000) | |
| httpd = BaseHTTPServer.HTTPServer(server_address, TestHandler) | |
| httpd.serve_forever() |
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