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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""HTTP server module.
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"""
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import socket |
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import BaseHTTPServer |
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import OpenSSL |
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import time |
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import logging |
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from ganeti import logger |
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from ganeti import serializer |
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class HTTPException(Exception): |
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code = None
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message = None
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def __init__(self, message=None): |
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if message is not None: |
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self.message = message
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class HTTPBadRequest(HTTPException): |
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code = 400
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class HTTPForbidden(HTTPException): |
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code = 403
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class HTTPNotFound(HTTPException): |
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code = 404
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class HTTPGone(HTTPException): |
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code = 410
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class HTTPLengthRequired(HTTPException): |
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code = 411
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class HTTPInternalError(HTTPException): |
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code = 500
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class HTTPNotImplemented(HTTPException): |
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code = 501
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class HTTPServiceUnavailable(HTTPException): |
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code = 503
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class ApacheLogfile: |
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"""Utility class to write HTTP server log files.
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The written format is the "Common Log Format" as defined by Apache:
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http://httpd.apache.org/docs/2.2/mod/mod_log_config.html#examples
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"""
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MONTHNAME = [None,
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'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', |
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'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'] |
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def __init__(self, fd): |
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"""Constructor for ApacheLogfile class.
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Args:
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- fd: Open file object
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"""
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self._fd = fd
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def LogRequest(self, request, format, *args): |
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self._fd.write("%s %s %s [%s] %s\n" % ( |
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# Remote host address
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request.address_string(), |
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# RFC1413 identity (identd)
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"-",
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# Remote user
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"-",
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# Request time
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self._FormatCurrentTime(),
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# Message
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format % args, |
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)) |
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self._fd.flush()
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def _FormatCurrentTime(self): |
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"""Formats current time in Common Log Format.
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"""
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return self._FormatLogTime(time.time()) |
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def _FormatLogTime(self, seconds): |
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"""Formats time for Common Log Format.
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All timestamps are logged in the UTC timezone.
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Args:
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- seconds: Time in seconds since the epoch
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"""
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(_, month, _, _, _, _, _, _, _) = tm = time.gmtime(seconds) |
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format = "%d/" + self.MONTHNAME[month] + "/%Y:%H:%M:%S +0000" |
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return time.strftime(format, tm)
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class HTTPServer(BaseHTTPServer.HTTPServer, object): |
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"""Class to provide an HTTP/HTTPS server.
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"""
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allow_reuse_address = True
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def __init__(self, server_address, HandlerClass, httplog=None, |
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enable_ssl=False, ssl_key=None, ssl_cert=None): |
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"""Server constructor.
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Args:
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server_address: a touple containing:
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ip: a string with IP address, localhost if empty string
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port: port number, integer
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HandlerClass: HTTPRequestHandler object
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httplog: Access log object
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enable_ssl: Whether to enable SSL
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ssl_key: SSL key file
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ssl_cert: SSL certificate key
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"""
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BaseHTTPServer.HTTPServer.__init__(self, server_address, HandlerClass)
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self.httplog = httplog
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if enable_ssl:
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# Set up SSL
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context = OpenSSL.SSL.Context(OpenSSL.SSL.SSLv23_METHOD) |
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context.use_privatekey_file(ssl_key) |
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context.use_certificate_file(ssl_cert) |
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self.socket = OpenSSL.SSL.Connection(context,
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socket.socket(self.address_family,
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self.socket_type))
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else:
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self.socket = socket.socket(self.address_family, self.socket_type) |
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self.server_bind()
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self.server_activate()
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class HTTPJsonConverter: |
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CONTENT_TYPE = "application/json"
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def Encode(self, data): |
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return serializer.DumpJson(data)
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def Decode(self, data): |
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return serializer.LoadJson(data)
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class HTTPRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler, object): |
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"""Request handler class.
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"""
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def setup(self): |
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"""Setup secure read and write file objects.
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"""
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self.connection = self.request |
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self.rfile = socket._fileobject(self.request, "rb", self.rbufsize) |
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self.wfile = socket._fileobject(self.request, "wb", self.wbufsize) |
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def handle_one_request(self): |
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"""Parses a request and calls the handler function.
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"""
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self.raw_requestline = None |
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try:
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self.raw_requestline = self.rfile.readline() |
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except OpenSSL.SSL.Error, ex:
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logger.Error("Error in SSL: %s" % str(ex)) |
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if not self.raw_requestline: |
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self.close_connection = 1 |
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return
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if not self.parse_request(): # An error code has been sent, just exit |
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return
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logging.debug("HTTP request: %s", self.raw_requestline.rstrip("\r\n")) |
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try:
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self._ReadPostData()
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result = self.HandleRequest()
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# TODO: Content-type
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encoder = HTTPJsonConverter() |
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encoded_result = encoder.Encode(result) |
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self.send_response(200) |
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self.send_header("Content-Type", encoder.CONTENT_TYPE) |
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self.send_header("Content-Length", str(len(encoded_result))) |
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self.end_headers()
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self.wfile.write(encoded_result)
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except HTTPException, err:
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self.send_error(err.code, message=err.message)
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except Exception, err: |
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self.send_error(HTTPInternalError.code, message=str(err)) |
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except:
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self.send_error(HTTPInternalError.code, message="Unknown error") |
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def _ReadPostData(self): |
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if self.command.upper() not in ("POST", "PUT"): |
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self.post_data = None |
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return
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# TODO: Decide what to do when Content-Length header was not sent
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try:
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content_length = int(self.headers.get('Content-Length', 0)) |
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except ValueError: |
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raise HTTPBadRequest("No Content-Length header or invalid format") |
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try:
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data = self.rfile.read(content_length)
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except socket.error, err:
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logger.Error("Socket error while reading: %s" % str(err)) |
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return
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# TODO: Content-type, error handling
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self.post_data = HTTPJsonConverter().Decode(data)
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logging.debug("HTTP POST data: %s", self.post_data) |
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def HandleRequest(self): |
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"""Handles a request.
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"""
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raise NotImplementedError() |
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def log_message(self, format, *args): |
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"""Log an arbitrary message.
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This is used by all other logging functions.
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The first argument, FORMAT, is a format string for the
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message to be logged. If the format string contains
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any % escapes requiring parameters, they should be
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specified as subsequent arguments (it's just like
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printf!).
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"""
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logging.debug("Handled request: %s", format % args)
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if self.server.httplog: |
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self.server.httplog.LogRequest(self, format, *args) |