python-jsgi

from spidermonkey import Runtime
import sys

rt = Runtime()

def jsprint(*args):
    print " ".join(str(a) for a in args)

def _require(source):
    cx = newcontext()
    exports = {}
    cx.add_global('exports', exports)
    cx.execute(source)
    return exports

def require(name):
    return _require(open(name+'.js').read())

def newcontext():
    cx = rt.new_context()
    cx.add_global("print", jsprint)
    cx.add_global("require", require)
    return cx

cx = newcontext()

if len(sys.argv) == 2:
    main = require(sys.argv[1])
else:
    main = _require("""
exports.app = function(env) {
    print(env.REMOTE_HOST);
    return {
        status: '200 OK',
        body: ["I'm content from javascript.. or is it python..?!"],
        headers: {                                                                   
            'content-type': 'text/plain'
        }     
    };                      
};
""")

from wsgiref.simple_server import make_server

def simple_app(environ, start_response):
    ret = main['app'](environ)
    headers = [(str(k), str(ret['headers'][k])) for k in ret['headers']]
    start_response(str(ret['status']), headers)
    return [str(s) for s in ret['body']]

httpd = make_server('', 8000, simple_app)
print "Serving on port 8000..."
httpd.serve_forever()