Exercise a flask app on stdio instead of a socket.

flask-stdio

#!/usr/bin/env python
'''
Most flask examples use a socket.
This flask example reads HTTP from stdin and writes HTTP to stdout.
A single HTTP request is processed.
Usage:

  printf "GET / HTTP/1.1\r\nHost: localhost\r\n\r\n" | ./flask-stdio

Note: not working yet under tcpserver, wants to read until EOF.
'''
from flask import Flask
from http_parser.http import HttpStream
from http_parser.reader import IterReader
import wsgiref.handlers


app = Flask(__name__)

@app.route("/")
def hello():
  return "Hello world."


class WSGIStdioHandler( wsgiref.handlers.SimpleHandler ):

  def setup_environ( self ):

    httpin = HttpStream(IterReader(self.get_stdin()), kind=0)
    headers = httpin.headers()
    environ = httpin.wsgi_environ()
    environ['wsgi.input']        = httpin.body_file()
    environ['wsgi.errors']       = self.get_stderr()
    environ['wsgi.version']      = (1, 0)
    environ['wsgi.multithread']  = False
    environ['wsgi.multiprocess'] = False
    environ['wsgi.run_once']     = True
    self.environ = environ


if __name__ == '__main__':
  import sys
  handler = WSGIStdioHandler( sys.stdin, sys.stdout, sys.stderr, {}, multithread=False, multiprocess=False )
  handler.run(app)

wsgiref.handlers.CGIHandler