qom: Use returned bool to check for failure, manual part
[qemu.git] / scripts / render_block_graph.py
1 #!/usr/bin/env python3
2 #
3 # Render Qemu Block Graph
4 #
5 # Copyright (c) 2018 Virtuozzo International GmbH. All rights reserved.
6 #
7 # This program is free software; you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 2 of the License, or
10 # (at your option) any later version.
11 #
12 # This program is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
16 #
17 # You should have received a copy of the GNU General Public License
18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
19 #
20
21 import os
22 import sys
23 import subprocess
24 import json
25 from graphviz import Digraph
26
27 sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'python'))
28 from qemu.machine import MonitorResponseError
29
30
31 def perm(arr):
32 s = 'w' if 'write' in arr else '_'
33 s += 'r' if 'consistent-read' in arr else '_'
34 s += 'u' if 'write-unchanged' in arr else '_'
35 s += 'g' if 'graph-mod' in arr else '_'
36 s += 's' if 'resize' in arr else '_'
37 return s
38
39
40 def render_block_graph(qmp, filename, format='png'):
41 '''
42 Render graph in text (dot) representation into "@filename" and
43 representation in @format into "@filename.@format"
44 '''
45
46 bds_nodes = qmp.command('query-named-block-nodes')
47 bds_nodes = {n['node-name']: n for n in bds_nodes}
48
49 job_nodes = qmp.command('query-block-jobs')
50 job_nodes = {n['device']: n for n in job_nodes}
51
52 block_graph = qmp.command('x-debug-query-block-graph')
53
54 graph = Digraph(comment='Block Nodes Graph')
55 graph.format = format
56 graph.node('permission symbols:\l'
57 ' w - Write\l'
58 ' r - consistent-Read\l'
59 ' u - write - Unchanged\l'
60 ' g - Graph-mod\l'
61 ' s - reSize\l'
62 'edge label scheme:\l'
63 ' <child type>\l'
64 ' <perm>\l'
65 ' <shared_perm>\l', shape='none')
66
67 for n in block_graph['nodes']:
68 if n['type'] == 'block-driver':
69 info = bds_nodes[n['name']]
70 label = n['name'] + ' [' + info['drv'] + ']'
71 if info['drv'] == 'file':
72 label += '\n' + os.path.basename(info['file'])
73 shape = 'ellipse'
74 elif n['type'] == 'block-job':
75 info = job_nodes[n['name']]
76 label = info['type'] + ' job (' + n['name'] + ')'
77 shape = 'box'
78 else:
79 assert n['type'] == 'block-backend'
80 label = n['name'] if n['name'] else 'unnamed blk'
81 shape = 'box'
82
83 graph.node(str(n['id']), label, shape=shape)
84
85 for e in block_graph['edges']:
86 label = '%s\l%s\l%s\l' % (e['name'], perm(e['perm']),
87 perm(e['shared-perm']))
88 graph.edge(str(e['parent']), str(e['child']), label=label)
89
90 graph.render(filename)
91
92
93 class LibvirtGuest():
94 def __init__(self, name):
95 self.name = name
96
97 def command(self, cmd):
98 # only supports qmp commands without parameters
99 m = {'execute': cmd}
100 ar = ['virsh', 'qemu-monitor-command', self.name, json.dumps(m)]
101
102 reply = json.loads(subprocess.check_output(ar))
103
104 if 'error' in reply:
105 raise MonitorResponseError(reply)
106
107 return reply['return']
108
109
110 if __name__ == '__main__':
111 obj = sys.argv[1]
112 out = sys.argv[2]
113
114 if os.path.exists(obj):
115 # assume unix socket
116 qmp = QEMUMonitorProtocol(obj)
117 qmp.connect()
118 else:
119 # assume libvirt guest name
120 qmp = LibvirtGuest(obj)
121
122 render_block_graph(qmp, out)