CgiPlusServer.py :  » Web-Frameworks » Webware » Webware-1.0.2 » WebKit » Adapters » CGIPlus » Python Open Source

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Python Open Source » Web Frameworks » Webware 
Webware » Webware 1.0.2 » WebKit » Adapters » CGIPlus » CgiPlusServer.py
from Common import *
import mimetools
from WebKit.CgiPlusAppServer import Handler,CPASStreamOut


class CgiPlusHandler:
  """Handle incoming requests.

  Recreated with every request. Abstract base class.

  """

  def __init__(self, env, rfile, wfile):
    self.env = env
    self.rfile = rfile
    self.wfile = wfile
    self._discardOutput = False

  def handleRequest(self):
    """
    Actually performs the request, creating the environment and
    calling self.doTransaction(env, myInput) to perform the
    response.
    """
    myInput = ''
    self._discardOutput = False
    if self.env.has_key('CONTENT_LENGTH'):
      length = int(self.env['CONTENT_LENGTH'])
      if length > 0:
        myInput += self.rfile.read(length)
    self.doTransaction(self.env, myInput)

  def processResponse(self, data):
    """Takes a string (like what a CGI script would print) and
    sends the actual HTTP response (response code, headers, body)."""
    if self._discardOutput:
      return
    self.wfile.write(data)
    self.wfile.flush()

  def doLocation(self, headers):
    """If there's a Location header and no Status header,
    we need to add a Status header ourselves."""
    if headers.has_key('Location'):
      if not headers.has_key('Status'):
        headers['Status'] = '301 Moved Temporarily'

  def sendStatus(self, headers):
    if not headers.has_key('Status'):
      status = "200 OK"
    else:
      status = headers['Status']
      del headers['Status']
    pos = status.find(' ')
    if pos == -1:
      code = int(status)
      message = ''
    else:
      code = int(status[:pos])
      message = status[pos:].strip()
    self.wfile.write("Status: %d %s\n" % (code, message))

  def sendHeaders(self, headers):
    for header, value in headers.items():
      self.send_header(header, value)
    self.end_headers()

  def send_header(self, keyword, value):
    """Send a MIME header."""
    self.wfile.write("%s: %s\n" % (keyword, value))

  def sendBody(self, bodyFile):
    self.wfile.write(bodyFile.read())
    bodyFile.close()
    self.wfile.flush()

  def end_headers(self):
    """Send the blank line ending the MIME headers."""
    self.wfile.write("\n")
    self.wfile.flush()


class CgiPlusAppServerHandler(Handler, CgiPlusHandler):
  """Adapters CgiPlusHandler to fit with CgiPlusAppServer's
  model of an adapter."""

  protocolName = 'CgiPlus'

  def handleRequest(self):
    CgiPlusHandler.__init__(self, os.environ, os.sys.stdin, os.sys.__stdout__)
    CgiPlusHandler.handleRequest(self)

  def doTransaction(self, env, myInput):
    streamOut = CPASStreamOut(os.sys.__stdout__)
    requestDict = {
      'format': 'CGI',
      'time': time.time(),
      'environ': env,
      'input': StringIO(myInput),
      'requestID': self._requestID,
      }
    self.dispatchRawRequest(requestDict, streamOut)
    self.processResponse(streamOut._buffer)

  def dispatchRawRequest(self, requestDict, streamOut):
    transaction = self._server._app.dispatchRawRequest(requestDict, streamOut)
    streamOut.close()
    transaction._application=None
    transaction.die()
    del transaction
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