]>
Commit | Line | Data |
---|---|---|
11fdf7f2 TL |
1 | |
2 | """ | |
3 | A hello world module | |
4 | ||
5 | See doc/mgr/hello.rst for more info. | |
6 | """ | |
7 | ||
8 | from mgr_module import MgrModule, HandleCommandResult | |
9 | from threading import Event | |
9f95a23c | 10 | import errno |
11fdf7f2 TL |
11 | |
12 | class Hello(MgrModule): | |
13 | # these are CLI commands we implement | |
14 | COMMANDS = [ | |
15 | { | |
16 | "cmd": "hello " | |
17 | "name=person_name,type=CephString,req=false", | |
9f95a23c TL |
18 | "desc": "Say hello", |
19 | "perm": "r" | |
20 | }, | |
21 | { | |
22 | "cmd": "count " | |
23 | "name=num,type=CephInt", | |
24 | "desc": "Do some counting", | |
11fdf7f2 TL |
25 | "perm": "r" |
26 | }, | |
27 | ] | |
28 | ||
9f95a23c TL |
29 | # These are module options we understand. These can be set with |
30 | # | |
31 | # ceph config set global mgr/hello/<name> <value> | |
32 | # | |
33 | # e.g., | |
34 | # | |
35 | # ceph config set global mgr/hello/place Earth | |
36 | # | |
11fdf7f2 TL |
37 | MODULE_OPTIONS = [ |
38 | { | |
39 | 'name': 'place', | |
40 | 'default': 'world', | |
9f95a23c TL |
41 | 'desc': 'a place in the world', |
42 | 'runtime': True, # can be updated at runtime (no mgr restart) | |
11fdf7f2 TL |
43 | }, |
44 | { | |
45 | 'name': 'emphatic', | |
46 | 'type': 'bool', | |
9f95a23c | 47 | 'desc': 'whether to say it loudly', |
11fdf7f2 | 48 | 'default': True, |
9f95a23c | 49 | 'runtime': True, |
11fdf7f2 | 50 | }, |
9f95a23c TL |
51 | { |
52 | 'name': 'foo', | |
53 | 'type': 'enum', | |
54 | 'enum_allowed': [ 'a', 'b', 'c' ], | |
55 | 'default': 'a', | |
56 | 'runtime': True, | |
57 | }, | |
58 | ] | |
59 | ||
60 | # These are "native" Ceph options that this module cares about. | |
61 | NATIVE_OPTIONS = [ | |
62 | 'mgr_tick_period', | |
11fdf7f2 TL |
63 | ] |
64 | ||
65 | def __init__(self, *args, **kwargs): | |
66 | super(Hello, self).__init__(*args, **kwargs) | |
67 | ||
9f95a23c | 68 | # set up some members to enable the serve() method and shutdown() |
11fdf7f2 TL |
69 | self.run = True |
70 | self.event = Event() | |
71 | ||
9f95a23c TL |
72 | # ensure config options members are initialized; see config_notify() |
73 | self.config_notify() | |
11fdf7f2 | 74 | |
11fdf7f2 | 75 | |
9f95a23c TL |
76 | def config_notify(self): |
77 | """ | |
78 | This method is called whenever one of our config options is changed. | |
79 | """ | |
80 | # This is some boilerplate that stores MODULE_OPTIONS in a class | |
81 | # member, so that, for instance, the 'emphatic' option is always | |
82 | # available as 'self.emphatic'. | |
83 | for opt in self.MODULE_OPTIONS: | |
84 | setattr(self, | |
85 | opt['name'], | |
86 | self.get_module_option(opt['name'])) | |
87 | self.log.debug(' mgr option %s = %s', | |
88 | opt['name'], getattr(self, opt['name'])) | |
89 | # Do the same for the native options. | |
90 | for opt in self.NATIVE_OPTIONS: | |
91 | setattr(self, | |
92 | opt, | |
93 | self.get_ceph_option(opt)) | |
94 | self.log.debug(' native option %s = %s', opt, getattr(self, opt)) | |
95 | ||
96 | def handle_command(self, inbuf, cmd): | |
97 | ret = 0 | |
98 | out = '' | |
99 | err = '' | |
100 | if cmd['prefix'] == 'hello': | |
101 | if 'person_name' in cmd: | |
102 | out = "Hello, " + cmd['person_name'] | |
103 | else: | |
104 | out = "Hello " + self.get_module_option('place') | |
105 | if self.get_module_option('emphatic'): | |
106 | out += '!' | |
107 | elif cmd['prefix'] == 'count': | |
108 | num = cmd.get('num', 0) | |
109 | if num < 1: | |
110 | err = 'That\'s too small a number' | |
111 | ret = -errno.EINVAL | |
112 | elif num > 10: | |
113 | err = 'That\'s too big a number' | |
114 | ret = -errno.EINVAL | |
115 | else: | |
116 | out = 'Hello, I am the count!\n' | |
117 | out += ', '.join([str(x) for x in range(1, num + 1)]) + '!' | |
118 | return HandleCommandResult( | |
119 | retval=ret, # exit code | |
120 | stdout=out, # stdout | |
121 | stderr=err) | |
11fdf7f2 TL |
122 | |
123 | def serve(self): | |
124 | """ | |
125 | This method is called by the mgr when the module starts and can be | |
126 | used for any background activity. | |
127 | """ | |
128 | self.log.info("Starting") | |
129 | while self.run: | |
9f95a23c TL |
130 | # Do some useful background work here. |
131 | ||
132 | # Use mgr_tick_period (default: 2) here just to illustrate | |
133 | # consuming native ceph options. Any real background work | |
134 | # would presumably have some more appropriate frequency. | |
135 | sleep_interval = self.mgr_tick_period | |
11fdf7f2 TL |
136 | self.log.debug('Sleeping for %d seconds', sleep_interval) |
137 | ret = self.event.wait(sleep_interval) | |
138 | self.event.clear() | |
139 | ||
140 | def shutdown(self): | |
141 | """ | |
142 | This method is called by the mgr when the module needs to shut | |
9f95a23c | 143 | down (i.e., when the serve() function needs to exit). |
11fdf7f2 TL |
144 | """ |
145 | self.log.info('Stopping') | |
146 | self.run = False | |
147 | self.event.set() |