root / htools / Ganeti / HTools / Types.hs @ e54d6628
History | View | Annotate | Download (11.4 kB)
1 |
{-# LANGUAGE TemplateHaskell #-} |
---|---|
2 |
|
3 |
{-| Some common types. |
4 |
|
5 |
-} |
6 |
|
7 |
{- |
8 |
|
9 |
Copyright (C) 2009, 2010, 2011, 2012 Google Inc. |
10 |
|
11 |
This program is free software; you can redistribute it and/or modify |
12 |
it under the terms of the GNU General Public License as published by |
13 |
the Free Software Foundation; either version 2 of the License, or |
14 |
(at your option) any later version. |
15 |
|
16 |
This program is distributed in the hope that it will be useful, but |
17 |
WITHOUT ANY WARRANTY; without even the implied warranty of |
18 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
19 |
General Public License for more details. |
20 |
|
21 |
You should have received a copy of the GNU General Public License |
22 |
along with this program; if not, write to the Free Software |
23 |
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
24 |
02110-1301, USA. |
25 |
|
26 |
-} |
27 |
|
28 |
module Ganeti.HTools.Types |
29 |
( Idx |
30 |
, Ndx |
31 |
, Gdx |
32 |
, NameAssoc |
33 |
, Score |
34 |
, Weight |
35 |
, GroupID |
36 |
, defaultGroupID |
37 |
, AllocPolicy(..) |
38 |
, allocPolicyFromRaw |
39 |
, allocPolicyToRaw |
40 |
, InstanceStatus(..) |
41 |
, instanceStatusFromRaw |
42 |
, instanceStatusToRaw |
43 |
, RSpec(..) |
44 |
, DynUtil(..) |
45 |
, zeroUtil |
46 |
, baseUtil |
47 |
, addUtil |
48 |
, subUtil |
49 |
, defReservedDiskRatio |
50 |
, unitMem |
51 |
, unitCpu |
52 |
, unitDsk |
53 |
, unknownField |
54 |
, Placement |
55 |
, IMove(..) |
56 |
, DiskTemplate(..) |
57 |
, diskTemplateToRaw |
58 |
, diskTemplateFromRaw |
59 |
, MoveJob |
60 |
, JobSet |
61 |
, Result(..) |
62 |
, isOk |
63 |
, isBad |
64 |
, eitherToResult |
65 |
, annotateResult |
66 |
, Element(..) |
67 |
, FailMode(..) |
68 |
, FailStats |
69 |
, OpResult(..) |
70 |
, opToResult |
71 |
, connTimeout |
72 |
, queryTimeout |
73 |
, EvacMode(..) |
74 |
, ISpec(..) |
75 |
, IPolicy(..) |
76 |
, defIPolicy |
77 |
, rspecFromISpec |
78 |
) where |
79 |
|
80 |
import qualified Data.Map as M |
81 |
import Text.JSON (makeObj, readJSON, showJSON) |
82 |
|
83 |
import qualified Ganeti.Constants as C |
84 |
import qualified Ganeti.THH as THH |
85 |
import Ganeti.BasicTypes |
86 |
import Ganeti.HTools.JSON |
87 |
|
88 |
-- | The instance index type. |
89 |
type Idx = Int |
90 |
|
91 |
-- | The node index type. |
92 |
type Ndx = Int |
93 |
|
94 |
-- | The group index type. |
95 |
type Gdx = Int |
96 |
|
97 |
-- | The type used to hold name-to-idx mappings. |
98 |
type NameAssoc = M.Map String Int |
99 |
|
100 |
-- | A separate name for the cluster score type. |
101 |
type Score = Double |
102 |
|
103 |
-- | A separate name for a weight metric. |
104 |
type Weight = Double |
105 |
|
106 |
-- | The Group UUID type. |
107 |
type GroupID = String |
108 |
|
109 |
-- | Default group UUID (just a string, not a real UUID). |
110 |
defaultGroupID :: GroupID |
111 |
defaultGroupID = "00000000-0000-0000-0000-000000000000" |
112 |
|
113 |
-- | Instance disk template type. |
114 |
$(THH.declareSADT "DiskTemplate" |
115 |
[ ("DTDiskless", 'C.dtDiskless) |
116 |
, ("DTFile", 'C.dtFile) |
117 |
, ("DTSharedFile", 'C.dtSharedFile) |
118 |
, ("DTPlain", 'C.dtPlain) |
119 |
, ("DTBlock", 'C.dtBlock) |
120 |
, ("DTDrbd8", 'C.dtDrbd8) |
121 |
]) |
122 |
$(THH.makeJSONInstance ''DiskTemplate) |
123 |
|
124 |
-- | The Group allocation policy type. |
125 |
-- |
126 |
-- Note that the order of constructors is important as the automatic |
127 |
-- Ord instance will order them in the order they are defined, so when |
128 |
-- changing this data type be careful about the interaction with the |
129 |
-- desired sorting order. |
130 |
$(THH.declareSADT "AllocPolicy" |
131 |
[ ("AllocPreferred", 'C.allocPolicyPreferred) |
132 |
, ("AllocLastResort", 'C.allocPolicyLastResort) |
133 |
, ("AllocUnallocable", 'C.allocPolicyUnallocable) |
134 |
]) |
135 |
$(THH.makeJSONInstance ''AllocPolicy) |
136 |
|
137 |
-- | The Instance real state type. |
138 |
$(THH.declareSADT "InstanceStatus" |
139 |
[ ("AdminDown", 'C.inststAdmindown) |
140 |
, ("AdminOffline", 'C.inststAdminoffline) |
141 |
, ("ErrorDown", 'C.inststErrordown) |
142 |
, ("ErrorUp", 'C.inststErrorup) |
143 |
, ("NodeDown", 'C.inststNodedown) |
144 |
, ("NodeOffline", 'C.inststNodeoffline) |
145 |
, ("Running", 'C.inststRunning) |
146 |
, ("WrongNode", 'C.inststWrongnode) |
147 |
]) |
148 |
$(THH.makeJSONInstance ''InstanceStatus) |
149 |
|
150 |
-- | The resource spec type. |
151 |
data RSpec = RSpec |
152 |
{ rspecCpu :: Int -- ^ Requested VCPUs |
153 |
, rspecMem :: Int -- ^ Requested memory |
154 |
, rspecDsk :: Int -- ^ Requested disk |
155 |
} deriving (Show, Read, Eq) |
156 |
|
157 |
|
158 |
-- | Instance specification type. |
159 |
$(THH.buildObject "ISpec" "iSpec" |
160 |
[ THH.renameField "MemorySize" $ THH.simpleField "memory-size" [t| Int |] |
161 |
, THH.renameField "CpuCount" $ THH.simpleField "cpu-count" [t| Int |] |
162 |
, THH.renameField "DiskSize" $ THH.simpleField "disk-size" [t| Int |] |
163 |
, THH.renameField "DiskCount" $ THH.simpleField "disk-count" [t| Int |] |
164 |
, THH.renameField "NicCount" $ THH.simpleField "nic-count" [t| Int |] |
165 |
]) |
166 |
|
167 |
-- | The default minimum ispec. |
168 |
defMinISpec :: ISpec |
169 |
defMinISpec = ISpec { iSpecMemorySize = C.ipolicyDefaultsMinMemorySize |
170 |
, iSpecCpuCount = C.ipolicyDefaultsMinCpuCount |
171 |
, iSpecDiskSize = C.ipolicyDefaultsMinDiskSize |
172 |
, iSpecDiskCount = C.ipolicyDefaultsMinDiskCount |
173 |
, iSpecNicCount = C.ipolicyDefaultsMinNicCount |
174 |
} |
175 |
|
176 |
-- | The default standard ispec. |
177 |
defStdISpec :: ISpec |
178 |
defStdISpec = ISpec { iSpecMemorySize = C.ipolicyDefaultsStdMemorySize |
179 |
, iSpecCpuCount = C.ipolicyDefaultsStdCpuCount |
180 |
, iSpecDiskSize = C.ipolicyDefaultsStdDiskSize |
181 |
, iSpecDiskCount = C.ipolicyDefaultsStdDiskCount |
182 |
, iSpecNicCount = C.ipolicyDefaultsStdNicCount |
183 |
} |
184 |
|
185 |
-- | The default max ispec. |
186 |
defMaxISpec :: ISpec |
187 |
defMaxISpec = ISpec { iSpecMemorySize = C.ipolicyDefaultsMaxMemorySize |
188 |
, iSpecCpuCount = C.ipolicyDefaultsMaxCpuCount |
189 |
, iSpecDiskSize = C.ipolicyDefaultsMaxDiskSize |
190 |
, iSpecDiskCount = C.ipolicyDefaultsMaxDiskCount |
191 |
, iSpecNicCount = C.ipolicyDefaultsMaxNicCount |
192 |
} |
193 |
|
194 |
-- | Instance policy type. |
195 |
$(THH.buildObject "IPolicy" "iPolicy" |
196 |
[ THH.renameField "StdSpec" $ THH.simpleField "std" [t| ISpec |] |
197 |
, THH.renameField "MinSpec" $ THH.simpleField "min" [t| ISpec |] |
198 |
, THH.renameField "MaxSpec" $ THH.simpleField "max" [t| ISpec |] |
199 |
, THH.renameField "DiskTemplates" $ |
200 |
THH.simpleField "disk_templates" [t| [DiskTemplate] |] |
201 |
, THH.renameField "VcpuRatio" $ |
202 |
THH.simpleField "vcpu_ratio" [t| Double |] |
203 |
]) |
204 |
|
205 |
-- | Converts an ISpec type to a RSpec one. |
206 |
rspecFromISpec :: ISpec -> RSpec |
207 |
rspecFromISpec ispec = RSpec { rspecCpu = iSpecCpuCount ispec |
208 |
, rspecMem = iSpecMemorySize ispec |
209 |
, rspecDsk = iSpecDiskSize ispec |
210 |
} |
211 |
|
212 |
-- | The default instance policy. |
213 |
defIPolicy :: IPolicy |
214 |
defIPolicy = IPolicy { iPolicyStdSpec = defStdISpec |
215 |
, iPolicyMinSpec = defMinISpec |
216 |
, iPolicyMaxSpec = defMaxISpec |
217 |
-- hardcoding here since Constants.hs exports the |
218 |
-- string values, not the actual type; and in |
219 |
-- htools, we are mostly looking at DRBD |
220 |
, iPolicyDiskTemplates = [DTDrbd8, DTPlain] |
221 |
, iPolicyVcpuRatio = C.ipolicyDefaultsVcpuRatio |
222 |
} |
223 |
|
224 |
-- | The dynamic resource specs of a machine (i.e. load or load |
225 |
-- capacity, as opposed to size). |
226 |
data DynUtil = DynUtil |
227 |
{ cpuWeight :: Weight -- ^ Standardised CPU usage |
228 |
, memWeight :: Weight -- ^ Standardised memory load |
229 |
, dskWeight :: Weight -- ^ Standardised disk I\/O usage |
230 |
, netWeight :: Weight -- ^ Standardised network usage |
231 |
} deriving (Show, Read, Eq) |
232 |
|
233 |
-- | Initial empty utilisation. |
234 |
zeroUtil :: DynUtil |
235 |
zeroUtil = DynUtil { cpuWeight = 0, memWeight = 0 |
236 |
, dskWeight = 0, netWeight = 0 } |
237 |
|
238 |
-- | Base utilisation (used when no actual utilisation data is |
239 |
-- supplied). |
240 |
baseUtil :: DynUtil |
241 |
baseUtil = DynUtil { cpuWeight = 1, memWeight = 1 |
242 |
, dskWeight = 1, netWeight = 1 } |
243 |
|
244 |
-- | Sum two utilisation records. |
245 |
addUtil :: DynUtil -> DynUtil -> DynUtil |
246 |
addUtil (DynUtil a1 a2 a3 a4) (DynUtil b1 b2 b3 b4) = |
247 |
DynUtil (a1+b1) (a2+b2) (a3+b3) (a4+b4) |
248 |
|
249 |
-- | Substracts one utilisation record from another. |
250 |
subUtil :: DynUtil -> DynUtil -> DynUtil |
251 |
subUtil (DynUtil a1 a2 a3 a4) (DynUtil b1 b2 b3 b4) = |
252 |
DynUtil (a1-b1) (a2-b2) (a3-b3) (a4-b4) |
253 |
|
254 |
-- | The description of an instance placement. It contains the |
255 |
-- instance index, the new primary and secondary node, the move being |
256 |
-- performed and the score of the cluster after the move. |
257 |
type Placement = (Idx, Ndx, Ndx, IMove, Score) |
258 |
|
259 |
-- | An instance move definition. |
260 |
data IMove = Failover -- ^ Failover the instance (f) |
261 |
| ReplacePrimary Ndx -- ^ Replace primary (f, r:np, f) |
262 |
| ReplaceSecondary Ndx -- ^ Replace secondary (r:ns) |
263 |
| ReplaceAndFailover Ndx -- ^ Replace secondary, failover (r:np, f) |
264 |
| FailoverAndReplace Ndx -- ^ Failover, replace secondary (f, r:ns) |
265 |
deriving (Show, Read) |
266 |
|
267 |
-- | Formatted solution output for one move (involved nodes and |
268 |
-- commands. |
269 |
type MoveJob = ([Ndx], Idx, IMove, [String]) |
270 |
|
271 |
-- | Unknown field in table output. |
272 |
unknownField :: String |
273 |
unknownField = "<unknown field>" |
274 |
|
275 |
-- | A list of command elements. |
276 |
type JobSet = [MoveJob] |
277 |
|
278 |
-- | Connection timeout (when using non-file methods). |
279 |
connTimeout :: Int |
280 |
connTimeout = 15 |
281 |
|
282 |
-- | The default timeout for queries (when using non-file methods). |
283 |
queryTimeout :: Int |
284 |
queryTimeout = 60 |
285 |
|
286 |
-- | Default max disk usage ratio. |
287 |
defReservedDiskRatio :: Double |
288 |
defReservedDiskRatio = 0 |
289 |
|
290 |
-- | Base memory unit. |
291 |
unitMem :: Int |
292 |
unitMem = 64 |
293 |
|
294 |
-- | Base disk unit. |
295 |
unitDsk :: Int |
296 |
unitDsk = 256 |
297 |
|
298 |
-- | Base vcpus unit. |
299 |
unitCpu :: Int |
300 |
unitCpu = 1 |
301 |
|
302 |
-- | Reason for an operation's falure. |
303 |
data FailMode = FailMem -- ^ Failed due to not enough RAM |
304 |
| FailDisk -- ^ Failed due to not enough disk |
305 |
| FailCPU -- ^ Failed due to not enough CPU capacity |
306 |
| FailN1 -- ^ Failed due to not passing N1 checks |
307 |
| FailTags -- ^ Failed due to tag exclusion |
308 |
deriving (Eq, Enum, Bounded, Show, Read) |
309 |
|
310 |
-- | List with failure statistics. |
311 |
type FailStats = [(FailMode, Int)] |
312 |
|
313 |
-- | Either-like data-type customized for our failure modes. |
314 |
-- |
315 |
-- The failure values for this monad track the specific allocation |
316 |
-- failures, so this is not a general error-monad (compare with the |
317 |
-- 'Result' data type). One downside is that this type cannot encode a |
318 |
-- generic failure mode, hence 'fail' for this monad is not defined |
319 |
-- and will cause an exception. |
320 |
data OpResult a = OpFail FailMode -- ^ Failed operation |
321 |
| OpGood a -- ^ Success operation |
322 |
deriving (Show, Read) |
323 |
|
324 |
instance Monad OpResult where |
325 |
(OpGood x) >>= fn = fn x |
326 |
(OpFail y) >>= _ = OpFail y |
327 |
return = OpGood |
328 |
|
329 |
-- | Conversion from 'OpResult' to 'Result'. |
330 |
opToResult :: OpResult a -> Result a |
331 |
opToResult (OpFail f) = Bad $ show f |
332 |
opToResult (OpGood v) = Ok v |
333 |
|
334 |
-- | A generic class for items that have updateable names and indices. |
335 |
class Element a where |
336 |
-- | Returns the name of the element |
337 |
nameOf :: a -> String |
338 |
-- | Returns all the known names of the element |
339 |
allNames :: a -> [String] |
340 |
-- | Returns the index of the element |
341 |
idxOf :: a -> Int |
342 |
-- | Updates the alias of the element |
343 |
setAlias :: a -> String -> a |
344 |
-- | Compute the alias by stripping a given suffix (domain) from |
345 |
-- the name |
346 |
computeAlias :: String -> a -> a |
347 |
computeAlias dom e = setAlias e alias |
348 |
where alias = take (length name - length dom) name |
349 |
name = nameOf e |
350 |
-- | Updates the index of the element |
351 |
setIdx :: a -> Int -> a |
352 |
|
353 |
-- | The iallocator node-evacuate evac_mode type. |
354 |
$(THH.declareSADT "EvacMode" |
355 |
[ ("ChangePrimary", 'C.iallocatorNevacPri) |
356 |
, ("ChangeSecondary", 'C.iallocatorNevacSec) |
357 |
, ("ChangeAll", 'C.iallocatorNevacAll) |
358 |
]) |
359 |
$(THH.makeJSONInstance ''EvacMode) |