Created
September 17, 2014 17:11
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| # Copyright 20141 Hewlett Packard. All Rights Reserved. | |
| # | |
| # Licensed under the Apache License, Version 2.0 (the "License"); you may | |
| # not use this file except in compliance with the License. You may obtain | |
| # a copy of the License at | |
| # | |
| # http://www.apache.org/licenses/LICENSE-2.0 | |
| # | |
| # Unless required by applicable law or agreed to in writing, software | |
| # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | |
| # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | |
| # License for the specific language governing permissions and limitations | |
| # under the License. | |
| def __read_session_info(self): | |
| """ | |
| Get session info from iscsiadm | |
| """ | |
| cmd = CommandExecutor() | |
| status = cmd.execute(['sudo', 'iscsiadm', '--mode', 'session', '-P', | |
| '3']) | |
| if status != 0: | |
| self.log.error('Getting session information failed: status %d' | |
| 'stderr %s' % (status, cmd.stderr)) | |
| lines = cmd.stdout.split('\n') | |
| return lines | |
| def _count_leading_tabs(self, s): | |
| """ | |
| Count the number of leading tabs in s | |
| """ | |
| total = 0 | |
| for c in s: | |
| if not c == '\t': | |
| break | |
| total += 1 | |
| return total | |
| def get_iscsi_info(self, lines): | |
| if lines == None: | |
| lines = self.__read_session_info() | |
| # Parse the result into a bunch of nested dictionaries... | |
| # FIXME:Should make a helper function - we might want to check more | |
| # properties elsewhere later. | |
| # FIXME: Document this parsing state machine since it is a bit ugly | |
| targets = {} | |
| targetname = None | |
| targetdetails = {} | |
| state = 'initial' | |
| while (len(lines) > 0): | |
| line = lines.pop(0) | |
| indent = self._count_leading_tabs(line) | |
| line = line.strip() | |
| if line.startswith('***'): | |
| continue | |
| if line == '': | |
| continue | |
| if state == 'initial': | |
| if line.startswith('Target: '): | |
| assert indent == 0 | |
| assert targetname == None | |
| targetname = line.split(':')[1].strip() | |
| state = 'parsing target' | |
| elif state == 'parsing target': | |
| assert targetname != None | |
| if line == 'Interface:': | |
| assert indent == 2 | |
| state = 'parsing interface' | |
| continue | |
| else: | |
| assert indent == 1 | |
| key, value = (line.split(':')[0], | |
| ":".join(line.split(':')[1:])) | |
| targetdetails[key.strip()] = value.strip() | |
| elif state == 'parsing interface': | |
| assert targetname != None | |
| assert indent == 2 | |
| if line == 'Negotiated iSCSI params:': | |
| state = 'parsing params' | |
| continue | |
| else: | |
| key, value = (line.split(':')[0], | |
| ":".join(line.split(':')[1:])) | |
| targetdetails[key.strip()] = value.strip() | |
| elif state == 'parsing params': | |
| assert targetname != None | |
| assert indent == 2 | |
| if line == 'Attached SCSI devices:': | |
| state = 'parsing devices' | |
| continue | |
| else: | |
| key, value = (line.split(':')[0], | |
| ":".join(line.split(':')[1:])) | |
| targetdetails[key.strip()] = value.strip() | |
| elif state == 'parsing devices': | |
| if indent == 0: | |
| # New target | |
| targets[targetname] = targetdetails | |
| targetdetails = {} | |
| state = 'parsing target' | |
| targetname = line.split(':')[1].strip() | |
| continue | |
| # FIXME: This is probably wrong if we have multiple luns in one | |
| # target, but I haven't got a machine set up like that to test | |
| # at the moment | |
| elif indent == 1: | |
| # New persistant portal? Not sure what this looks like or | |
| # how we should handle it... punt for now | |
| raise Exception('Unhandled output from iscsiadm') | |
| elif indent == 2: | |
| # This would be important if we handled more than one | |
| # lun... for now, skip it | |
| continue | |
| else: | |
| assert indent == 3 | |
| assert line.startswith('Attached scsi disk') | |
| device = line.split()[3] | |
| devicestate = line.split()[5] | |
| targetdetails['device'] = device | |
| targetdetails['state'] = devicestate | |
| continue | |
| else: | |
| raise Exception('get_device_name: Unknown state in parsing' | |
| 'state machine! Panic: state = %s' % | |
| state) | |
| # Last target found has not yet been saved... | |
| targets[targetname] = targetdetails | |
| return targets | |
| def get_device_name(self, target, portal, lines=None): | |
| """ | |
| Get the device name for a target we are attached to | |
| Raise an exception if we aren't attached to that target | |
| """ | |
| self.log.debug('get_device_name target %s portal %s' % (target, | |
| portal)) | |
| targets = self.get_iscsi_info(lines) | |
| try: | |
| self.log.debug('Device returned is %s' % | |
| targets[target]['device']) | |
| return targets[target]['device'] | |
| except KeyError: | |
| raise KeyError("ISCSI target not attached") |
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