1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
|
#!/usr/bin/env python
# Copyright 2011 OpenStack LLC.
# Copyright 2011 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# 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.
#
# XenAPI plugin for reading/writing information to xenstore
#
try:
import json
except ImportError:
import simplejson as json
import os
import random
import re
import subprocess
import tempfile
import time
import XenAPIPlugin
import pluginlib_nova as pluginlib
pluginlib.configure_logging("xenhost")
host_data_pattern = re.compile(r"\s*(\S+) \([^\)]+\) *: ?(.*)")
def jsonify(fnc):
def wrapper(*args, **kwargs):
return json.dumps(fnc(*args, **kwargs))
return wrapper
class TimeoutError(StandardError):
pass
def _run_command(cmd):
"""Abstracts out the basics of issuing system commands. If the command
returns anything in stderr, a PluginError is raised with that information.
Otherwise, the output from stdout is returned.
"""
pipe = subprocess.PIPE
proc = subprocess.Popen([cmd], shell=True, stdin=pipe, stdout=pipe,
stderr=pipe, close_fds=True)
proc.wait()
err = proc.stderr.read()
if err:
raise pluginlib.PluginError(err)
return proc.stdout.read()
def _get_host_uuid():
cmd = "xe host-list | grep uuid"
resp = _run_command(cmd)
return resp.split(":")[-1].strip()
@jsonify
def set_host_enabled(self, arg_dict):
"""Sets this host's ability to accept new instances.
It will otherwise continue to operate normally.
"""
enabled = arg_dict.get("enabled")
if enabled is None:
raise pluginlib.PluginError(
_("Missing 'enabled' argument to set_host_enabled"))
if enabled == "true":
result = _run_command("xe host-enable")
elif enabled == "false":
result = _run_command("xe host-disable")
else:
raise pluginlib.PluginError(_("Illegal enabled status: %s") % enabled)
# Should be empty string
if result:
raise pluginlib.PluginError(result)
# Return the current enabled status
host_uuid = _get_host_uuid()
cmd = "xe host-param-list uuid=%s | grep enabled" % host_uuid
resp = _run_command(cmd)
# Response should be in the format: "enabled ( RO): true"
host_enabled = resp.strip().split()[-1]
if host_enabled == "true":
status = "enabled"
else:
status = "disabled"
return {"status": status}
def _powerstate(state):
host_uuid = _get_host_uuid()
cmd = "xe host-disable uuid=%(host_uuid)s" % locals()
_run_command(cmd)
cmd = "xe host-%(state)s uuid=%(host_uuid)s" % locals()
_run_command(cmd)
return {"powerstate": state}
@jsonify
def host_reboot(self, arg_dict):
"""Reboots the host."""
return _powerstate("reboot")
@jsonify
def host_shutdown(self, arg_dict):
"""Reboots the host."""
return _powerstate("shutdown")
@jsonify
def host_data(self, arg_dict):
"""Runs the commands on the xenstore host to return the current status
information.
"""
host_uuid = _get_host_uuid()
cmd = "xe host-param-list uuid=%s" % host_uuid
resp = _run_command(cmd)
parsed_data = parse_response(resp)
# We have the raw dict of values. Extract those that we need,
# and convert the data types as needed.
ret_dict = cleanup(parsed_data)
return ret_dict
def parse_response(resp):
data = {}
for ln in resp.splitlines():
if not ln:
continue
mtch = host_data_pattern.match(ln.strip())
try:
k, v = mtch.groups()
data[k] = v
except AttributeError:
# Not a valid line; skip it
continue
return data
def cleanup(dct):
"""Take the raw KV pairs returned and translate them into the
appropriate types, discarding any we don't need.
"""
def safe_int(val):
"""Integer values will either be string versions of numbers,
or empty strings. Convert the latter to nulls.
"""
try:
return int(val)
except ValueError:
return None
def strip_kv(ln):
return [val.strip() for val in ln.split(":", 1)]
out = {}
# sbs = dct.get("supported-bootloaders", "")
# out["host_supported-bootloaders"] = sbs.split("; ")
# out["host_suspend-image-sr-uuid"] = dct.get("suspend-image-sr-uuid", "")
# out["host_crash-dump-sr-uuid"] = dct.get("crash-dump-sr-uuid", "")
# out["host_local-cache-sr"] = dct.get("local-cache-sr", "")
out["host_memory"] = omm = {}
omm["total"] = safe_int(dct.get("memory-total", ""))
omm["overhead"] = safe_int(dct.get("memory-overhead", ""))
omm["free"] = safe_int(dct.get("memory-free", ""))
omm["free-computed"] = safe_int(
dct.get("memory-free-computed", ""))
# out["host_API-version"] = avv = {}
# avv["vendor"] = dct.get("API-version-vendor", "")
# avv["major"] = safe_int(dct.get("API-version-major", ""))
# avv["minor"] = safe_int(dct.get("API-version-minor", ""))
out["host_uuid"] = dct.get("uuid", None)
out["host_name-label"] = dct.get("name-label", "")
out["host_name-description"] = dct.get("name-description", "")
# out["host_host-metrics-live"] = dct.get(
# "host-metrics-live", "false") == "true"
out["host_hostname"] = dct.get("hostname", "")
out["host_ip_address"] = dct.get("address", "")
oc = dct.get("other-config", "")
out["host_other-config"] = ocd = {}
if oc:
for oc_fld in oc.split("; "):
ock, ocv = strip_kv(oc_fld)
ocd[ock] = ocv
# out["host_capabilities"] = dct.get("capabilities", "").split("; ")
# out["host_allowed-operations"] = dct.get(
# "allowed-operations", "").split("; ")
# lsrv = dct.get("license-server", "")
# out["host_license-server"] = ols = {}
# if lsrv:
# for lspart in lsrv.split("; "):
# lsk, lsv = lspart.split(": ")
# if lsk == "port":
# ols[lsk] = safe_int(lsv)
# else:
# ols[lsk] = lsv
# sv = dct.get("software-version", "")
# out["host_software-version"] = osv = {}
# if sv:
# for svln in sv.split("; "):
# svk, svv = strip_kv(svln)
# osv[svk] = svv
cpuinf = dct.get("cpu_info", "")
out["host_cpu_info"] = ocp = {}
if cpuinf:
for cpln in cpuinf.split("; "):
cpk, cpv = strip_kv(cpln)
if cpk in ("cpu_count", "family", "model", "stepping"):
ocp[cpk] = safe_int(cpv)
else:
ocp[cpk] = cpv
# out["host_edition"] = dct.get("edition", "")
# out["host_external-auth-service-name"] = dct.get(
# "external-auth-service-name", "")
return out
if __name__ == "__main__":
XenAPIPlugin.dispatch(
{"host_data": host_data,
"set_host_enabled": set_host_enabled,
"host_shutdown": host_shutdown,
"host_reboot": host_reboot})
|
