root / lib / http / server.py @ f2e13d55
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| 1 | 02cab3e7 | Michael Hanselmann | #
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| 2 | 02cab3e7 | Michael Hanselmann | #
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| 3 | 02cab3e7 | Michael Hanselmann | |
| 4 | 02cab3e7 | Michael Hanselmann | # Copyright (C) 2007, 2008 Google Inc.
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| 5 | 02cab3e7 | Michael Hanselmann | #
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| 6 | 02cab3e7 | Michael Hanselmann | # This program is free software; you can redistribute it and/or modify
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| 7 | 02cab3e7 | Michael Hanselmann | # it under the terms of the GNU General Public License as published by
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| 8 | 02cab3e7 | Michael Hanselmann | # the Free Software Foundation; either version 2 of the License, or
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| 9 | 02cab3e7 | Michael Hanselmann | # (at your option) any later version.
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| 10 | 02cab3e7 | Michael Hanselmann | #
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| 11 | 02cab3e7 | Michael Hanselmann | # This program is distributed in the hope that it will be useful, but
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| 12 | 02cab3e7 | Michael Hanselmann | # WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | 02cab3e7 | Michael Hanselmann | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 14 | 02cab3e7 | Michael Hanselmann | # General Public License for more details.
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| 15 | 02cab3e7 | Michael Hanselmann | #
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| 16 | 02cab3e7 | Michael Hanselmann | # You should have received a copy of the GNU General Public License
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| 17 | 02cab3e7 | Michael Hanselmann | # along with this program; if not, write to the Free Software
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| 18 | 02cab3e7 | Michael Hanselmann | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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| 19 | 02cab3e7 | Michael Hanselmann | # 02110-1301, USA.
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| 20 | 02cab3e7 | Michael Hanselmann | |
| 21 | 02cab3e7 | Michael Hanselmann | """HTTP server module.
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| 22 | 02cab3e7 | Michael Hanselmann |
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| 23 | 02cab3e7 | Michael Hanselmann | """
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| 24 | 02cab3e7 | Michael Hanselmann | |
| 25 | 02cab3e7 | Michael Hanselmann | import BaseHTTPServer |
| 26 | 02cab3e7 | Michael Hanselmann | import cgi |
| 27 | 02cab3e7 | Michael Hanselmann | import logging |
| 28 | 02cab3e7 | Michael Hanselmann | import os |
| 29 | 02cab3e7 | Michael Hanselmann | import select |
| 30 | 02cab3e7 | Michael Hanselmann | import socket |
| 31 | 02cab3e7 | Michael Hanselmann | import time |
| 32 | 02cab3e7 | Michael Hanselmann | import signal |
| 33 | 02cab3e7 | Michael Hanselmann | |
| 34 | 02cab3e7 | Michael Hanselmann | from ganeti import constants |
| 35 | 02cab3e7 | Michael Hanselmann | from ganeti import serializer |
| 36 | 02cab3e7 | Michael Hanselmann | from ganeti import utils |
| 37 | 02cab3e7 | Michael Hanselmann | from ganeti import http |
| 38 | 02cab3e7 | Michael Hanselmann | |
| 39 | 02cab3e7 | Michael Hanselmann | |
| 40 | 02cab3e7 | Michael Hanselmann | WEEKDAYNAME = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'] |
| 41 | 02cab3e7 | Michael Hanselmann | MONTHNAME = [None,
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| 42 | 02cab3e7 | Michael Hanselmann | 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', |
| 43 | 02cab3e7 | Michael Hanselmann | 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'] |
| 44 | 02cab3e7 | Michael Hanselmann | |
| 45 | 02cab3e7 | Michael Hanselmann | # Default error message
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| 46 | 02cab3e7 | Michael Hanselmann | DEFAULT_ERROR_CONTENT_TYPE = "text/html"
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| 47 | 02cab3e7 | Michael Hanselmann | DEFAULT_ERROR_MESSAGE = """\
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| 48 | 02cab3e7 | Michael Hanselmann | <html>
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| 49 | 02cab3e7 | Michael Hanselmann | <head>
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| 50 | 02cab3e7 | Michael Hanselmann | <title>Error response</title>
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| 51 | 02cab3e7 | Michael Hanselmann | </head>
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| 52 | 02cab3e7 | Michael Hanselmann | <body>
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| 53 | 02cab3e7 | Michael Hanselmann | <h1>Error response</h1>
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| 54 | 02cab3e7 | Michael Hanselmann | <p>Error code %(code)d.
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| 55 | 02cab3e7 | Michael Hanselmann | <p>Message: %(message)s.
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| 56 | 02cab3e7 | Michael Hanselmann | <p>Error code explanation: %(code)s = %(explain)s.
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| 57 | 02cab3e7 | Michael Hanselmann | </body>
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| 58 | 02cab3e7 | Michael Hanselmann | </html>
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| 59 | 02cab3e7 | Michael Hanselmann | """
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| 60 | 02cab3e7 | Michael Hanselmann | |
| 61 | 02cab3e7 | Michael Hanselmann | |
| 62 | 02cab3e7 | Michael Hanselmann | def _DateTimeHeader(): |
| 63 | 02cab3e7 | Michael Hanselmann | """Return the current date and time formatted for a message header.
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| 64 | 02cab3e7 | Michael Hanselmann |
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| 65 | 02cab3e7 | Michael Hanselmann | """
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| 66 | 02cab3e7 | Michael Hanselmann | (year, month, day, hh, mm, ss, wd, _, _) = time.gmtime() |
| 67 | 02cab3e7 | Michael Hanselmann | return ("%s, %02d %3s %4d %02d:%02d:%02d GMT" % |
| 68 | 02cab3e7 | Michael Hanselmann | (WEEKDAYNAME[wd], day, MONTHNAME[month], year, hh, mm, ss)) |
| 69 | 02cab3e7 | Michael Hanselmann | |
| 70 | 02cab3e7 | Michael Hanselmann | |
| 71 | 02cab3e7 | Michael Hanselmann | class _HttpServerRequest(object): |
| 72 | 02cab3e7 | Michael Hanselmann | """Data structure for HTTP request on server side.
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| 73 | 02cab3e7 | Michael Hanselmann |
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| 74 | 02cab3e7 | Michael Hanselmann | """
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| 75 | 02cab3e7 | Michael Hanselmann | def __init__(self, request_msg): |
| 76 | 02cab3e7 | Michael Hanselmann | # Request attributes
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| 77 | 02cab3e7 | Michael Hanselmann | self.request_method = request_msg.start_line.method
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| 78 | 02cab3e7 | Michael Hanselmann | self.request_path = request_msg.start_line.path
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| 79 | 02cab3e7 | Michael Hanselmann | self.request_headers = request_msg.headers
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| 80 | 02cab3e7 | Michael Hanselmann | self.request_body = request_msg.decoded_body
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| 81 | 02cab3e7 | Michael Hanselmann | |
| 82 | 02cab3e7 | Michael Hanselmann | # Response attributes
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| 83 | 02cab3e7 | Michael Hanselmann | self.resp_headers = {}
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| 84 | 02cab3e7 | Michael Hanselmann | |
| 85 | 02cab3e7 | Michael Hanselmann | |
| 86 | 02cab3e7 | Michael Hanselmann | class _HttpServerToClientMessageWriter(http.HttpMessageWriter): |
| 87 | 02cab3e7 | Michael Hanselmann | """Writes an HTTP response to client.
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| 88 | 02cab3e7 | Michael Hanselmann |
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| 89 | 02cab3e7 | Michael Hanselmann | """
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| 90 | 02cab3e7 | Michael Hanselmann | def __init__(self, sock, request_msg, response_msg, write_timeout): |
| 91 | 358a8811 | Michael Hanselmann | """Writes the response to the client.
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| 92 | 358a8811 | Michael Hanselmann |
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| 93 | 358a8811 | Michael Hanselmann | @type sock: socket
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| 94 | 358a8811 | Michael Hanselmann | @param sock: Target socket
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| 95 | 358a8811 | Michael Hanselmann | @type request_msg: http.HttpMessage
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| 96 | 358a8811 | Michael Hanselmann | @param request_msg: Request message, required to determine whether
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| 97 | 358a8811 | Michael Hanselmann | response may have a message body
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| 98 | 358a8811 | Michael Hanselmann | @type response_msg: http.HttpMessage
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| 99 | 358a8811 | Michael Hanselmann | @param response_msg: Response message
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| 100 | 358a8811 | Michael Hanselmann | @type write_timeout: float
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| 101 | 358a8811 | Michael Hanselmann | @param write_timeout: Write timeout for socket
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| 102 | 02cab3e7 | Michael Hanselmann |
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| 103 | 02cab3e7 | Michael Hanselmann | """
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| 104 | 02cab3e7 | Michael Hanselmann | self._request_msg = request_msg
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| 105 | 02cab3e7 | Michael Hanselmann | self._response_msg = response_msg
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| 106 | 02cab3e7 | Michael Hanselmann | http.HttpMessageWriter.__init__(self, sock, response_msg, write_timeout)
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| 107 | 02cab3e7 | Michael Hanselmann | |
| 108 | 02cab3e7 | Michael Hanselmann | def HasMessageBody(self): |
| 109 | 02cab3e7 | Michael Hanselmann | """Logic to detect whether response should contain a message body.
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| 110 | 02cab3e7 | Michael Hanselmann |
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| 111 | 02cab3e7 | Michael Hanselmann | """
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| 112 | 02cab3e7 | Michael Hanselmann | if self._request_msg.start_line: |
| 113 | 02cab3e7 | Michael Hanselmann | request_method = self._request_msg.start_line.method
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| 114 | 02cab3e7 | Michael Hanselmann | else:
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| 115 | 02cab3e7 | Michael Hanselmann | request_method = None
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| 116 | 02cab3e7 | Michael Hanselmann | |
| 117 | 02cab3e7 | Michael Hanselmann | response_code = self._response_msg.start_line.code
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| 118 | 02cab3e7 | Michael Hanselmann | |
| 119 | 02cab3e7 | Michael Hanselmann | # RFC2616, section 4.3: "A message-body MUST NOT be included in a request
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| 120 | 02cab3e7 | Michael Hanselmann | # if the specification of the request method (section 5.1.1) does not allow
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| 121 | 02cab3e7 | Michael Hanselmann | # sending an entity-body in requests"
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| 122 | 02cab3e7 | Michael Hanselmann | #
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| 123 | 02cab3e7 | Michael Hanselmann | # RFC2616, section 9.4: "The HEAD method is identical to GET except that
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| 124 | 02cab3e7 | Michael Hanselmann | # the server MUST NOT return a message-body in the response."
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| 125 | 02cab3e7 | Michael Hanselmann | #
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| 126 | 02cab3e7 | Michael Hanselmann | # RFC2616, section 10.2.5: "The 204 response MUST NOT include a
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| 127 | 02cab3e7 | Michael Hanselmann | # message-body [...]"
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| 128 | 02cab3e7 | Michael Hanselmann | #
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| 129 | 02cab3e7 | Michael Hanselmann | # RFC2616, section 10.3.5: "The 304 response MUST NOT contain a
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| 130 | 02cab3e7 | Michael Hanselmann | # message-body, [...]"
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| 131 | 02cab3e7 | Michael Hanselmann | |
| 132 | 02cab3e7 | Michael Hanselmann | return (http.HttpMessageWriter.HasMessageBody(self) and |
| 133 | 3f3dfc15 | Iustin Pop | (request_method is not None and |
| 134 | 3f3dfc15 | Iustin Pop | request_method != http.HTTP_HEAD) and
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| 135 | 02cab3e7 | Michael Hanselmann | response_code >= http.HTTP_OK and
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| 136 | 3f3dfc15 | Iustin Pop | response_code not in (http.HTTP_NO_CONTENT, |
| 137 | 3f3dfc15 | Iustin Pop | http.HTTP_NOT_MODIFIED)) |
| 138 | 02cab3e7 | Michael Hanselmann | |
| 139 | 02cab3e7 | Michael Hanselmann | |
| 140 | 02cab3e7 | Michael Hanselmann | class _HttpClientToServerMessageReader(http.HttpMessageReader): |
| 141 | 02cab3e7 | Michael Hanselmann | """Reads an HTTP request sent by client.
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| 142 | 02cab3e7 | Michael Hanselmann |
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| 143 | 02cab3e7 | Michael Hanselmann | """
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| 144 | 02cab3e7 | Michael Hanselmann | # Length limits
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| 145 | 02cab3e7 | Michael Hanselmann | START_LINE_LENGTH_MAX = 4096
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| 146 | 02cab3e7 | Michael Hanselmann | HEADER_LENGTH_MAX = 4096
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| 147 | 02cab3e7 | Michael Hanselmann | |
| 148 | 02cab3e7 | Michael Hanselmann | def ParseStartLine(self, start_line): |
| 149 | 02cab3e7 | Michael Hanselmann | """Parses the start line sent by client.
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| 150 | 02cab3e7 | Michael Hanselmann |
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| 151 | 02cab3e7 | Michael Hanselmann | Example: "GET /index.html HTTP/1.1"
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| 152 | 02cab3e7 | Michael Hanselmann |
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| 153 | 02cab3e7 | Michael Hanselmann | @type start_line: string
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| 154 | 02cab3e7 | Michael Hanselmann | @param start_line: Start line
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| 155 | 02cab3e7 | Michael Hanselmann |
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| 156 | 02cab3e7 | Michael Hanselmann | """
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| 157 | 02cab3e7 | Michael Hanselmann | # Empty lines are skipped when reading
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| 158 | 02cab3e7 | Michael Hanselmann | assert start_line
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| 159 | 02cab3e7 | Michael Hanselmann | |
| 160 | 02cab3e7 | Michael Hanselmann | logging.debug("HTTP request: %s", start_line)
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| 161 | 02cab3e7 | Michael Hanselmann | |
| 162 | 02cab3e7 | Michael Hanselmann | words = start_line.split() |
| 163 | 02cab3e7 | Michael Hanselmann | |
| 164 | 02cab3e7 | Michael Hanselmann | if len(words) == 3: |
| 165 | 02cab3e7 | Michael Hanselmann | [method, path, version] = words |
| 166 | 02cab3e7 | Michael Hanselmann | if version[:5] != 'HTTP/': |
| 167 | 02cab3e7 | Michael Hanselmann | raise http.HttpBadRequest("Bad request version (%r)" % version) |
| 168 | 02cab3e7 | Michael Hanselmann | |
| 169 | 02cab3e7 | Michael Hanselmann | try:
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| 170 | 02cab3e7 | Michael Hanselmann | base_version_number = version.split("/", 1)[1] |
| 171 | 02cab3e7 | Michael Hanselmann | version_number = base_version_number.split(".")
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| 172 | 02cab3e7 | Michael Hanselmann | |
| 173 | 02cab3e7 | Michael Hanselmann | # RFC 2145 section 3.1 says there can be only one "." and
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| 174 | 02cab3e7 | Michael Hanselmann | # - major and minor numbers MUST be treated as
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| 175 | 02cab3e7 | Michael Hanselmann | # separate integers;
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| 176 | 02cab3e7 | Michael Hanselmann | # - HTTP/2.4 is a lower version than HTTP/2.13, which in
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| 177 | 02cab3e7 | Michael Hanselmann | # turn is lower than HTTP/12.3;
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| 178 | 02cab3e7 | Michael Hanselmann | # - Leading zeros MUST be ignored by recipients.
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| 179 | 02cab3e7 | Michael Hanselmann | if len(version_number) != 2: |
| 180 | 02cab3e7 | Michael Hanselmann | raise http.HttpBadRequest("Bad request version (%r)" % version) |
| 181 | 02cab3e7 | Michael Hanselmann | |
| 182 | 02cab3e7 | Michael Hanselmann | version_number = (int(version_number[0]), int(version_number[1])) |
| 183 | 02cab3e7 | Michael Hanselmann | except (ValueError, IndexError): |
| 184 | 02cab3e7 | Michael Hanselmann | raise http.HttpBadRequest("Bad request version (%r)" % version) |
| 185 | 02cab3e7 | Michael Hanselmann | |
| 186 | 02cab3e7 | Michael Hanselmann | if version_number >= (2, 0): |
| 187 | 02cab3e7 | Michael Hanselmann | raise http.HttpVersionNotSupported("Invalid HTTP Version (%s)" % |
| 188 | 02cab3e7 | Michael Hanselmann | base_version_number) |
| 189 | 02cab3e7 | Michael Hanselmann | |
| 190 | 02cab3e7 | Michael Hanselmann | elif len(words) == 2: |
| 191 | 02cab3e7 | Michael Hanselmann | version = http.HTTP_0_9 |
| 192 | 02cab3e7 | Michael Hanselmann | [method, path] = words |
| 193 | 02cab3e7 | Michael Hanselmann | if method != http.HTTP_GET:
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| 194 | 02cab3e7 | Michael Hanselmann | raise http.HttpBadRequest("Bad HTTP/0.9 request type (%r)" % method) |
| 195 | 02cab3e7 | Michael Hanselmann | |
| 196 | 02cab3e7 | Michael Hanselmann | else:
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| 197 | 02cab3e7 | Michael Hanselmann | raise http.HttpBadRequest("Bad request syntax (%r)" % start_line) |
| 198 | 02cab3e7 | Michael Hanselmann | |
| 199 | 02cab3e7 | Michael Hanselmann | return http.HttpClientToServerStartLine(method, path, version)
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| 200 | 02cab3e7 | Michael Hanselmann | |
| 201 | 02cab3e7 | Michael Hanselmann | |
| 202 | 02cab3e7 | Michael Hanselmann | class _HttpServerRequestExecutor(object): |
| 203 | 02cab3e7 | Michael Hanselmann | """Implements server side of HTTP.
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| 204 | 02cab3e7 | Michael Hanselmann |
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| 205 | 02cab3e7 | Michael Hanselmann | This class implements the server side of HTTP. It's based on code of Python's
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| 206 | 02cab3e7 | Michael Hanselmann | BaseHTTPServer, from both version 2.4 and 3k. It does not support non-ASCII
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| 207 | 02cab3e7 | Michael Hanselmann | character encodings. Keep-alive connections are not supported.
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| 208 | 02cab3e7 | Michael Hanselmann |
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| 209 | 02cab3e7 | Michael Hanselmann | """
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| 210 | 02cab3e7 | Michael Hanselmann | # The default request version. This only affects responses up until
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| 211 | 02cab3e7 | Michael Hanselmann | # the point where the request line is parsed, so it mainly decides what
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| 212 | 02cab3e7 | Michael Hanselmann | # the client gets back when sending a malformed request line.
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| 213 | 02cab3e7 | Michael Hanselmann | # Most web servers default to HTTP 0.9, i.e. don't send a status line.
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| 214 | 02cab3e7 | Michael Hanselmann | default_request_version = http.HTTP_0_9 |
| 215 | 02cab3e7 | Michael Hanselmann | |
| 216 | 02cab3e7 | Michael Hanselmann | # Error message settings
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| 217 | 02cab3e7 | Michael Hanselmann | error_message_format = DEFAULT_ERROR_MESSAGE |
| 218 | 02cab3e7 | Michael Hanselmann | error_content_type = DEFAULT_ERROR_CONTENT_TYPE |
| 219 | 02cab3e7 | Michael Hanselmann | |
| 220 | 02cab3e7 | Michael Hanselmann | responses = BaseHTTPServer.BaseHTTPRequestHandler.responses |
| 221 | 02cab3e7 | Michael Hanselmann | |
| 222 | 02cab3e7 | Michael Hanselmann | # Timeouts in seconds for socket layer
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| 223 | 02cab3e7 | Michael Hanselmann | WRITE_TIMEOUT = 10
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| 224 | 02cab3e7 | Michael Hanselmann | READ_TIMEOUT = 10
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| 225 | 02cab3e7 | Michael Hanselmann | CLOSE_TIMEOUT = 1
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| 226 | 02cab3e7 | Michael Hanselmann | |
| 227 | 02cab3e7 | Michael Hanselmann | def __init__(self, server, sock, client_addr): |
| 228 | 02cab3e7 | Michael Hanselmann | """Initializes this class.
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| 229 | 02cab3e7 | Michael Hanselmann |
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| 230 | 02cab3e7 | Michael Hanselmann | """
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| 231 | 02cab3e7 | Michael Hanselmann | self.server = server
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| 232 | 02cab3e7 | Michael Hanselmann | self.sock = sock
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| 233 | 02cab3e7 | Michael Hanselmann | self.client_addr = client_addr
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| 234 | 02cab3e7 | Michael Hanselmann | |
| 235 | 02cab3e7 | Michael Hanselmann | self.poller = select.poll()
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| 236 | 02cab3e7 | Michael Hanselmann | |
| 237 | 02cab3e7 | Michael Hanselmann | self.request_msg = http.HttpMessage()
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| 238 | 02cab3e7 | Michael Hanselmann | self.response_msg = http.HttpMessage()
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| 239 | 02cab3e7 | Michael Hanselmann | |
| 240 | 02cab3e7 | Michael Hanselmann | self.response_msg.start_line = \
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| 241 | 02cab3e7 | Michael Hanselmann | http.HttpServerToClientStartLine(version=self.default_request_version,
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| 242 | 02cab3e7 | Michael Hanselmann | code=None, reason=None) |
| 243 | 02cab3e7 | Michael Hanselmann | |
| 244 | 02cab3e7 | Michael Hanselmann | # Disable Python's timeout
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| 245 | 02cab3e7 | Michael Hanselmann | self.sock.settimeout(None) |
| 246 | 02cab3e7 | Michael Hanselmann | |
| 247 | 02cab3e7 | Michael Hanselmann | # Operate in non-blocking mode
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| 248 | 02cab3e7 | Michael Hanselmann | self.sock.setblocking(0) |
| 249 | 02cab3e7 | Michael Hanselmann | |
| 250 | 02cab3e7 | Michael Hanselmann | logging.info("Connection from %s:%s", client_addr[0], client_addr[1]) |
| 251 | 02cab3e7 | Michael Hanselmann | try:
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| 252 | 02cab3e7 | Michael Hanselmann | request_msg_reader = None
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| 253 | 02cab3e7 | Michael Hanselmann | force_close = True
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| 254 | 02cab3e7 | Michael Hanselmann | try:
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| 255 | f2e13d55 | Michael Hanselmann | # Do the secret SSL handshake
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| 256 | f2e13d55 | Michael Hanselmann | if self.server.using_ssl: |
| 257 | f2e13d55 | Michael Hanselmann | self.sock.set_accept_state()
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| 258 | f2e13d55 | Michael Hanselmann | try:
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| 259 | f2e13d55 | Michael Hanselmann | http.Handshake(self.poller, self.sock, self.WRITE_TIMEOUT) |
| 260 | f2e13d55 | Michael Hanselmann | except http.HttpSessionHandshakeUnexpectedEOF:
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| 261 | f2e13d55 | Michael Hanselmann | # Ignore rest
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| 262 | f2e13d55 | Michael Hanselmann | return
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| 263 | f2e13d55 | Michael Hanselmann | |
| 264 | 02cab3e7 | Michael Hanselmann | try:
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| 265 | 02cab3e7 | Michael Hanselmann | try:
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| 266 | 02cab3e7 | Michael Hanselmann | request_msg_reader = self._ReadRequest()
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| 267 | 02cab3e7 | Michael Hanselmann | self._HandleRequest()
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| 268 | 02cab3e7 | Michael Hanselmann | |
| 269 | 02cab3e7 | Michael Hanselmann | # Only wait for client to close if we didn't have any exception.
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| 270 | 02cab3e7 | Michael Hanselmann | force_close = False
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| 271 | 02cab3e7 | Michael Hanselmann | except http.HttpException, err:
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| 272 | 02cab3e7 | Michael Hanselmann | self._SetErrorStatus(err)
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| 273 | 02cab3e7 | Michael Hanselmann | finally:
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| 274 | 02cab3e7 | Michael Hanselmann | # Try to send a response
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| 275 | 02cab3e7 | Michael Hanselmann | self._SendResponse()
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| 276 | 02cab3e7 | Michael Hanselmann | finally:
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| 277 | 02cab3e7 | Michael Hanselmann | http.ShutdownConnection(self.poller, sock,
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| 278 | 02cab3e7 | Michael Hanselmann | self.CLOSE_TIMEOUT, self.WRITE_TIMEOUT, |
| 279 | 02cab3e7 | Michael Hanselmann | request_msg_reader, force_close) |
| 280 | 02cab3e7 | Michael Hanselmann | |
| 281 | 02cab3e7 | Michael Hanselmann | self.sock.close()
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| 282 | 02cab3e7 | Michael Hanselmann | self.sock = None |
| 283 | 02cab3e7 | Michael Hanselmann | finally:
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| 284 | 02cab3e7 | Michael Hanselmann | logging.info("Disconnected %s:%s", client_addr[0], client_addr[1]) |
| 285 | 02cab3e7 | Michael Hanselmann | |
| 286 | 02cab3e7 | Michael Hanselmann | def _ReadRequest(self): |
| 287 | 02cab3e7 | Michael Hanselmann | """Reads a request sent by client.
|
| 288 | 02cab3e7 | Michael Hanselmann |
|
| 289 | 02cab3e7 | Michael Hanselmann | """
|
| 290 | 02cab3e7 | Michael Hanselmann | try:
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| 291 | 02cab3e7 | Michael Hanselmann | request_msg_reader = \ |
| 292 | 02cab3e7 | Michael Hanselmann | _HttpClientToServerMessageReader(self.sock, self.request_msg, |
| 293 | 02cab3e7 | Michael Hanselmann | self.READ_TIMEOUT)
|
| 294 | 02cab3e7 | Michael Hanselmann | except http.HttpSocketTimeout:
|
| 295 | 02cab3e7 | Michael Hanselmann | raise http.HttpError("Timeout while reading request") |
| 296 | 02cab3e7 | Michael Hanselmann | except socket.error, err:
|
| 297 | 02cab3e7 | Michael Hanselmann | raise http.HttpError("Error reading request: %s" % err) |
| 298 | 02cab3e7 | Michael Hanselmann | |
| 299 | 02cab3e7 | Michael Hanselmann | self.response_msg.start_line.version = self.request_msg.start_line.version |
| 300 | 02cab3e7 | Michael Hanselmann | |
| 301 | 02cab3e7 | Michael Hanselmann | return request_msg_reader
|
| 302 | 02cab3e7 | Michael Hanselmann | |
| 303 | 02cab3e7 | Michael Hanselmann | def _HandleRequest(self): |
| 304 | 02cab3e7 | Michael Hanselmann | """Calls the handler function for the current request.
|
| 305 | 02cab3e7 | Michael Hanselmann |
|
| 306 | 02cab3e7 | Michael Hanselmann | """
|
| 307 | 02cab3e7 | Michael Hanselmann | handler_context = _HttpServerRequest(self.request_msg)
|
| 308 | 02cab3e7 | Michael Hanselmann | |
| 309 | 02cab3e7 | Michael Hanselmann | try:
|
| 310 | 02cab3e7 | Michael Hanselmann | result = self.server.HandleRequest(handler_context)
|
| 311 | 02cab3e7 | Michael Hanselmann | except (http.HttpException, KeyboardInterrupt, SystemExit): |
| 312 | 02cab3e7 | Michael Hanselmann | raise
|
| 313 | 02cab3e7 | Michael Hanselmann | except Exception, err: |
| 314 | 02cab3e7 | Michael Hanselmann | logging.exception("Caught exception")
|
| 315 | 02cab3e7 | Michael Hanselmann | raise http.HttpInternalError(message=str(err)) |
| 316 | 02cab3e7 | Michael Hanselmann | except:
|
| 317 | 02cab3e7 | Michael Hanselmann | logging.exception("Unknown exception")
|
| 318 | 02cab3e7 | Michael Hanselmann | raise http.HttpInternalError(message="Unknown error") |
| 319 | 02cab3e7 | Michael Hanselmann | |
| 320 | 02cab3e7 | Michael Hanselmann | # TODO: Content-type
|
| 321 | 02cab3e7 | Michael Hanselmann | encoder = http.HttpJsonConverter() |
| 322 | 02cab3e7 | Michael Hanselmann | self.response_msg.start_line.code = http.HTTP_OK
|
| 323 | 02cab3e7 | Michael Hanselmann | self.response_msg.body = encoder.Encode(result)
|
| 324 | 02cab3e7 | Michael Hanselmann | self.response_msg.headers = handler_context.resp_headers
|
| 325 | 02cab3e7 | Michael Hanselmann | self.response_msg.headers[http.HTTP_CONTENT_TYPE] = encoder.CONTENT_TYPE
|
| 326 | 02cab3e7 | Michael Hanselmann | |
| 327 | 02cab3e7 | Michael Hanselmann | def _SendResponse(self): |
| 328 | 02cab3e7 | Michael Hanselmann | """Sends the response to the client.
|
| 329 | 02cab3e7 | Michael Hanselmann |
|
| 330 | 02cab3e7 | Michael Hanselmann | """
|
| 331 | 02cab3e7 | Michael Hanselmann | if self.response_msg.start_line.code is None: |
| 332 | 02cab3e7 | Michael Hanselmann | return
|
| 333 | 02cab3e7 | Michael Hanselmann | |
| 334 | 02cab3e7 | Michael Hanselmann | if not self.response_msg.headers: |
| 335 | 02cab3e7 | Michael Hanselmann | self.response_msg.headers = {}
|
| 336 | 02cab3e7 | Michael Hanselmann | |
| 337 | 02cab3e7 | Michael Hanselmann | self.response_msg.headers.update({
|
| 338 | 02cab3e7 | Michael Hanselmann | # TODO: Keep-alive is not supported
|
| 339 | 02cab3e7 | Michael Hanselmann | http.HTTP_CONNECTION: "close",
|
| 340 | 02cab3e7 | Michael Hanselmann | http.HTTP_DATE: _DateTimeHeader(), |
| 341 | 02cab3e7 | Michael Hanselmann | http.HTTP_SERVER: http.HTTP_GANETI_VERSION, |
| 342 | 02cab3e7 | Michael Hanselmann | }) |
| 343 | 02cab3e7 | Michael Hanselmann | |
| 344 | 02cab3e7 | Michael Hanselmann | # Get response reason based on code
|
| 345 | 02cab3e7 | Michael Hanselmann | response_code = self.response_msg.start_line.code
|
| 346 | 02cab3e7 | Michael Hanselmann | if response_code in self.responses: |
| 347 | 02cab3e7 | Michael Hanselmann | response_reason = self.responses[response_code][0] |
| 348 | 02cab3e7 | Michael Hanselmann | else:
|
| 349 | 02cab3e7 | Michael Hanselmann | response_reason = ""
|
| 350 | 02cab3e7 | Michael Hanselmann | self.response_msg.start_line.reason = response_reason
|
| 351 | 02cab3e7 | Michael Hanselmann | |
| 352 | 02cab3e7 | Michael Hanselmann | logging.info("%s:%s %s %s", self.client_addr[0], self.client_addr[1], |
| 353 | 02cab3e7 | Michael Hanselmann | self.request_msg.start_line, response_code)
|
| 354 | 02cab3e7 | Michael Hanselmann | |
| 355 | 02cab3e7 | Michael Hanselmann | try:
|
| 356 | 02cab3e7 | Michael Hanselmann | _HttpServerToClientMessageWriter(self.sock, self.request_msg, |
| 357 | 02cab3e7 | Michael Hanselmann | self.response_msg, self.WRITE_TIMEOUT) |
| 358 | 02cab3e7 | Michael Hanselmann | except http.HttpSocketTimeout:
|
| 359 | 02cab3e7 | Michael Hanselmann | raise http.HttpError("Timeout while sending response") |
| 360 | 02cab3e7 | Michael Hanselmann | except socket.error, err:
|
| 361 | 02cab3e7 | Michael Hanselmann | raise http.HttpError("Error sending response: %s" % err) |
| 362 | 02cab3e7 | Michael Hanselmann | |
| 363 | 02cab3e7 | Michael Hanselmann | def _SetErrorStatus(self, err): |
| 364 | 02cab3e7 | Michael Hanselmann | """Sets the response code and body from a HttpException.
|
| 365 | 02cab3e7 | Michael Hanselmann |
|
| 366 | 02cab3e7 | Michael Hanselmann | @type err: HttpException
|
| 367 | 02cab3e7 | Michael Hanselmann | @param err: Exception instance
|
| 368 | 02cab3e7 | Michael Hanselmann |
|
| 369 | 02cab3e7 | Michael Hanselmann | """
|
| 370 | 02cab3e7 | Michael Hanselmann | try:
|
| 371 | 02cab3e7 | Michael Hanselmann | (shortmsg, longmsg) = self.responses[err.code]
|
| 372 | 02cab3e7 | Michael Hanselmann | except KeyError: |
| 373 | 02cab3e7 | Michael Hanselmann | shortmsg = longmsg = "Unknown"
|
| 374 | 02cab3e7 | Michael Hanselmann | |
| 375 | 02cab3e7 | Michael Hanselmann | if err.message:
|
| 376 | 02cab3e7 | Michael Hanselmann | message = err.message |
| 377 | 02cab3e7 | Michael Hanselmann | else:
|
| 378 | 02cab3e7 | Michael Hanselmann | message = shortmsg |
| 379 | 02cab3e7 | Michael Hanselmann | |
| 380 | 02cab3e7 | Michael Hanselmann | values = {
|
| 381 | 02cab3e7 | Michael Hanselmann | "code": err.code,
|
| 382 | 02cab3e7 | Michael Hanselmann | "message": cgi.escape(message),
|
| 383 | 02cab3e7 | Michael Hanselmann | "explain": longmsg,
|
| 384 | 02cab3e7 | Michael Hanselmann | } |
| 385 | 02cab3e7 | Michael Hanselmann | |
| 386 | 02cab3e7 | Michael Hanselmann | self.response_msg.start_line.code = err.code
|
| 387 | 02cab3e7 | Michael Hanselmann | self.response_msg.headers = {
|
| 388 | 02cab3e7 | Michael Hanselmann | http.HTTP_CONTENT_TYPE: self.error_content_type,
|
| 389 | 02cab3e7 | Michael Hanselmann | } |
| 390 | 02cab3e7 | Michael Hanselmann | self.response_msg.body = self.error_message_format % values |
| 391 | 02cab3e7 | Michael Hanselmann | |
| 392 | 02cab3e7 | Michael Hanselmann | |
| 393 | f4322a1e | Michael Hanselmann | class HttpServer(http.HttpBase): |
| 394 | 02cab3e7 | Michael Hanselmann | """Generic HTTP server class
|
| 395 | 02cab3e7 | Michael Hanselmann |
|
| 396 | 02cab3e7 | Michael Hanselmann | Users of this class must subclass it and override the HandleRequest function.
|
| 397 | 02cab3e7 | Michael Hanselmann |
|
| 398 | 02cab3e7 | Michael Hanselmann | """
|
| 399 | 02cab3e7 | Michael Hanselmann | MAX_CHILDREN = 20
|
| 400 | 02cab3e7 | Michael Hanselmann | |
| 401 | 02cab3e7 | Michael Hanselmann | def __init__(self, mainloop, local_address, port, |
| 402 | 02cab3e7 | Michael Hanselmann | ssl_params=None, ssl_verify_peer=False): |
| 403 | 02cab3e7 | Michael Hanselmann | """Initializes the HTTP server
|
| 404 | 02cab3e7 | Michael Hanselmann |
|
| 405 | 02cab3e7 | Michael Hanselmann | @type mainloop: ganeti.daemon.Mainloop
|
| 406 | 02cab3e7 | Michael Hanselmann | @param mainloop: Mainloop used to poll for I/O events
|
| 407 | c41eea6e | Iustin Pop | @type local_address: string
|
| 408 | 02cab3e7 | Michael Hanselmann | @param local_address: Local IP address to bind to
|
| 409 | 02cab3e7 | Michael Hanselmann | @type port: int
|
| 410 | 02cab3e7 | Michael Hanselmann | @param port: TCP port to listen on
|
| 411 | 02cab3e7 | Michael Hanselmann | @type ssl_params: HttpSslParams
|
| 412 | 02cab3e7 | Michael Hanselmann | @param ssl_params: SSL key and certificate
|
| 413 | 02cab3e7 | Michael Hanselmann | @type ssl_verify_peer: bool
|
| 414 | 02cab3e7 | Michael Hanselmann | @param ssl_verify_peer: Whether to require client certificate and compare
|
| 415 | 02cab3e7 | Michael Hanselmann | it with our certificate
|
| 416 | 02cab3e7 | Michael Hanselmann |
|
| 417 | 02cab3e7 | Michael Hanselmann | """
|
| 418 | f4322a1e | Michael Hanselmann | http.HttpBase.__init__(self)
|
| 419 | 02cab3e7 | Michael Hanselmann | |
| 420 | 02cab3e7 | Michael Hanselmann | self.mainloop = mainloop
|
| 421 | 02cab3e7 | Michael Hanselmann | self.local_address = local_address
|
| 422 | 02cab3e7 | Michael Hanselmann | self.port = port
|
| 423 | 02cab3e7 | Michael Hanselmann | |
| 424 | 02cab3e7 | Michael Hanselmann | self.socket = self._CreateSocket(ssl_params, ssl_verify_peer) |
| 425 | 02cab3e7 | Michael Hanselmann | |
| 426 | 02cab3e7 | Michael Hanselmann | # Allow port to be reused
|
| 427 | 02cab3e7 | Michael Hanselmann | self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) |
| 428 | 02cab3e7 | Michael Hanselmann | |
| 429 | 02cab3e7 | Michael Hanselmann | self._children = []
|
| 430 | 02cab3e7 | Michael Hanselmann | |
| 431 | 02cab3e7 | Michael Hanselmann | mainloop.RegisterIO(self, self.socket.fileno(), select.POLLIN) |
| 432 | 02cab3e7 | Michael Hanselmann | mainloop.RegisterSignal(self)
|
| 433 | 02cab3e7 | Michael Hanselmann | |
| 434 | 02cab3e7 | Michael Hanselmann | def Start(self): |
| 435 | 02cab3e7 | Michael Hanselmann | self.socket.bind((self.local_address, self.port)) |
| 436 | 59305197 | Michael Hanselmann | self.socket.listen(1024) |
| 437 | 02cab3e7 | Michael Hanselmann | |
| 438 | 02cab3e7 | Michael Hanselmann | def Stop(self): |
| 439 | 02cab3e7 | Michael Hanselmann | self.socket.close()
|
| 440 | 02cab3e7 | Michael Hanselmann | |
| 441 | 02cab3e7 | Michael Hanselmann | def OnIO(self, fd, condition): |
| 442 | 02cab3e7 | Michael Hanselmann | if condition & select.POLLIN:
|
| 443 | 02cab3e7 | Michael Hanselmann | self._IncomingConnection()
|
| 444 | 02cab3e7 | Michael Hanselmann | |
| 445 | 02cab3e7 | Michael Hanselmann | def OnSignal(self, signum): |
| 446 | 02cab3e7 | Michael Hanselmann | if signum == signal.SIGCHLD:
|
| 447 | 02cab3e7 | Michael Hanselmann | self._CollectChildren(True) |
| 448 | 02cab3e7 | Michael Hanselmann | |
| 449 | 02cab3e7 | Michael Hanselmann | def _CollectChildren(self, quick): |
| 450 | 02cab3e7 | Michael Hanselmann | """Checks whether any child processes are done
|
| 451 | 02cab3e7 | Michael Hanselmann |
|
| 452 | 02cab3e7 | Michael Hanselmann | @type quick: bool
|
| 453 | 02cab3e7 | Michael Hanselmann | @param quick: Whether to only use non-blocking functions
|
| 454 | 02cab3e7 | Michael Hanselmann |
|
| 455 | 02cab3e7 | Michael Hanselmann | """
|
| 456 | 02cab3e7 | Michael Hanselmann | if not quick: |
| 457 | 02cab3e7 | Michael Hanselmann | # Don't wait for other processes if it should be a quick check
|
| 458 | 02cab3e7 | Michael Hanselmann | while len(self._children) > self.MAX_CHILDREN: |
| 459 | 02cab3e7 | Michael Hanselmann | try:
|
| 460 | 02cab3e7 | Michael Hanselmann | # Waiting without a timeout brings us into a potential DoS situation.
|
| 461 | 02cab3e7 | Michael Hanselmann | # As soon as too many children run, we'll not respond to new
|
| 462 | 02cab3e7 | Michael Hanselmann | # requests. The real solution would be to add a timeout for children
|
| 463 | 02cab3e7 | Michael Hanselmann | # and killing them after some time.
|
| 464 | 02cab3e7 | Michael Hanselmann | pid, status = os.waitpid(0, 0) |
| 465 | 02cab3e7 | Michael Hanselmann | except os.error:
|
| 466 | 02cab3e7 | Michael Hanselmann | pid = None
|
| 467 | 02cab3e7 | Michael Hanselmann | if pid and pid in self._children: |
| 468 | 02cab3e7 | Michael Hanselmann | self._children.remove(pid)
|
| 469 | 02cab3e7 | Michael Hanselmann | |
| 470 | 02cab3e7 | Michael Hanselmann | for child in self._children: |
| 471 | 02cab3e7 | Michael Hanselmann | try:
|
| 472 | 02cab3e7 | Michael Hanselmann | pid, status = os.waitpid(child, os.WNOHANG) |
| 473 | 02cab3e7 | Michael Hanselmann | except os.error:
|
| 474 | 02cab3e7 | Michael Hanselmann | pid = None
|
| 475 | 02cab3e7 | Michael Hanselmann | if pid and pid in self._children: |
| 476 | 02cab3e7 | Michael Hanselmann | self._children.remove(pid)
|
| 477 | 02cab3e7 | Michael Hanselmann | |
| 478 | 02cab3e7 | Michael Hanselmann | def _IncomingConnection(self): |
| 479 | 02cab3e7 | Michael Hanselmann | """Called for each incoming connection
|
| 480 | 02cab3e7 | Michael Hanselmann |
|
| 481 | 02cab3e7 | Michael Hanselmann | """
|
| 482 | 02cab3e7 | Michael Hanselmann | (connection, client_addr) = self.socket.accept()
|
| 483 | 02cab3e7 | Michael Hanselmann | |
| 484 | 02cab3e7 | Michael Hanselmann | self._CollectChildren(False) |
| 485 | 02cab3e7 | Michael Hanselmann | |
| 486 | 02cab3e7 | Michael Hanselmann | pid = os.fork() |
| 487 | 02cab3e7 | Michael Hanselmann | if pid == 0: |
| 488 | 02cab3e7 | Michael Hanselmann | # Child process
|
| 489 | 02cab3e7 | Michael Hanselmann | try:
|
| 490 | 02cab3e7 | Michael Hanselmann | _HttpServerRequestExecutor(self, connection, client_addr)
|
| 491 | 02cab3e7 | Michael Hanselmann | except Exception: |
| 492 | 02cab3e7 | Michael Hanselmann | logging.exception("Error while handling request from %s:%s",
|
| 493 | 02cab3e7 | Michael Hanselmann | client_addr[0], client_addr[1]) |
| 494 | 02cab3e7 | Michael Hanselmann | os._exit(1)
|
| 495 | 02cab3e7 | Michael Hanselmann | os._exit(0)
|
| 496 | 02cab3e7 | Michael Hanselmann | else:
|
| 497 | 02cab3e7 | Michael Hanselmann | self._children.append(pid)
|
| 498 | 02cab3e7 | Michael Hanselmann | |
| 499 | 02cab3e7 | Michael Hanselmann | def HandleRequest(self, req): |
| 500 | 02cab3e7 | Michael Hanselmann | """Handles a request.
|
| 501 | 02cab3e7 | Michael Hanselmann |
|
| 502 | 02cab3e7 | Michael Hanselmann | Must be overriden by subclass.
|
| 503 | 02cab3e7 | Michael Hanselmann |
|
| 504 | 02cab3e7 | Michael Hanselmann | """
|
| 505 | 02cab3e7 | Michael Hanselmann | raise NotImplementedError() |