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@hirokiky hirokiky/garam.py
Last active Nov 22, 2016

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A Web server. I wrote it for studying. https://gist.github.com/knzm/5675317
from itertools import chain
import multiprocessing
import socket
import sys
def static_view(env, start_response):
mes = 'test'
start_response('200 OK', [('Cache-Control', 'private'),
('Content-Type', 'text/html'),
('Connection', 'Close')])
return mes
class BadRequest(Exception):
pass
def handle_badrequest():
return ['400 Bad Request']
class GaramServer(object):
def __init__(self, host, port):
self.host = host
self.port = port
self.socket = socket.socket(socket.AF_INET,
socket.SOCK_STREAM)
def bind_socket(self):
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.socket.bind((self.host, self.port))
def handle(self, data):
return []
def _serve(self, conn, addr):
data = conn.recv(1024)
try:
mes = self.handle(data)
except BadRequest:
mes = handle_badrequest()
for m in mes:
conn.send(m)
def serve(self):
self.bind_socket()
self.socket.listen(1)
while True:
try:
conn, addr = self.socket.accept()
process = multiprocessing.Process(target=self._serve, args=(conn, addr))
process.daemon = True
process.start()
conn.close()
except Exception:
for process in multiprocessing.active_children():
process.terminate()
process.join()
break
class WSGIRequestParser(object):
def __init__(self, data):
self.data = data
self.head = data.split('\n\n')[0]
self.body = ''
def parse_head(self, head):
env = {}
head = head.split('\n')
try:
env['METHOD'], env['URI'], env['VERSION'] = head[0].split()
except ValueError:
raise BadRequest
for h in head[1:]:
if ': ' in h:
k, v = h.split(': ')
env[k] = v
return env
def parse(self):
env = self.parse_head(self.head)
return env
class WSGIResponseParser(object):
def __init__(self, status, headers, body):
self.status = status
self.headers = headers
self.body = body
def parse_header(self, status, headers):
header_strs = []
header_strs.append('HTTP/1.0 %s' % status)
header_strs.extend(['%s: %s' % (k, v) for k, v in headers])
return '\n'.join(header_strs)
def parse(self):
parsed_header = self.parse_header(self.status, self.headers)
res = chain([parsed_header, '\n\n'], self.body)
return res
class GaramWSGIServer(GaramServer):
def __init__(self, app,
host='127.0.0.1',
port=8000,
RequestParser=WSGIRequestParser,
ResponseParser=WSGIResponseParser):
self.app = app
self.host = host
self.port = port
self.socket = socket.socket(socket.AF_INET,
socket.SOCK_STREAM)
self.RequestParser = RequestParser
self.ResponseParser = ResponseParser
def start_response(self, status, headers):
self.status, self.headers = status, headers
def handle(self, data):
request_parser = self.RequestParser(data)
environ = request_parser.parse()
body = self.app(environ, self.start_response)
response_parser = self.ResponseParser(self.status,
self.headers,
body)
response = response_parser.parse()
return response
if __name__ == '__main__':
server = GaramWSGIServer(static_view)
server.serve()
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