3664d8e466
Add a comment documenting the restriction that our xenapi plugins must target Python 2.4 features because of restrictions with the XenServer dom0 userspace. Change-Id: Ide130923b16c0555c3190cbd63ce97e18d18aae0
87 lines
2.5 KiB
Python
Executable File
87 lines
2.5 KiB
Python
Executable File
#!/usr/bin/python
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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# NOTE: XenServer still only supports Python 2.4 in it's dom0 userspace
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# which means the Nova xenapi plugins must use only Python 2.4 features
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"""
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To configure this plugin, you must set the following xenstore key:
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/local/logconsole/@ = "/var/log/xen/guest/console.%d"
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This can be done by running:
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xenstore-write /local/logconsole/@ "/var/log/xen/guest/console.%d"
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WARNING:
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You should ensure appropriate log rotation to ensure
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guests are not able to consume too much Dom0 disk space,
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and equally should not be able to stop other guests from logging.
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Adding and removing the following xenstore key will reopen the log,
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as will be required after a log rotate:
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/local/logconsole/<dom_id>
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"""
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import base64
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import logging
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import zlib
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import XenAPIPlugin
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import pluginlib_nova
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pluginlib_nova.configure_logging("console")
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CONSOLE_LOG_DIR = '/var/log/xen/guest'
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CONSOLE_LOG_FILE_PATTERN = CONSOLE_LOG_DIR + '/console.%d'
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MAX_CONSOLE_BYTES = 102400
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SEEK_SET = 0
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SEEK_END = 2
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def _last_bytes(file_like_object):
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try:
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file_like_object.seek(-MAX_CONSOLE_BYTES, SEEK_END)
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except IOError, e:
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if e.errno == 22:
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file_like_object.seek(0, SEEK_SET)
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else:
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raise
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return file_like_object.read()
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def get_console_log(session, arg_dict):
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try:
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raw_dom_id = arg_dict['dom_id']
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except KeyError:
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raise pluginlib_nova.PluginError("Missing dom_id")
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try:
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dom_id = int(raw_dom_id)
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except ValueError:
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raise pluginlib_nova.PluginError("Invalid dom_id")
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logfile = open(CONSOLE_LOG_FILE_PATTERN % dom_id, 'rb')
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try:
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try:
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log_content = _last_bytes(logfile)
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except IOError, e:
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msg = "Error reading console: %s" % e
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logging.debug(msg)
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raise pluginlib_nova.PluginError(msg)
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finally:
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logfile.close()
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return base64.b64encode(zlib.compress(log_content))
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if __name__ == "__main__":
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XenAPIPlugin.dispatch({"get_console_log": get_console_log})
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