7 Copyright (C) 2009 Google Inc.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful, but
15 WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
26 module Ganeti.HTools.Types
39 , defReservedDiskRatio
53 -- | The instance index type.
56 -- | The node index type.
59 -- | The type used to hold name-to-idx mappings.
60 type NameAssoc = [(String, Int)]
62 -- | A separate name for the cluster score type.
65 -- | A separate name for a weight metric.
68 -- | The resource spec type.
70 { rspecCpu :: Int -- ^ Requested VCPUs
71 , rspecMem :: Int -- ^ Requested memory
72 , rspecDsk :: Int -- ^ Requested disk
75 -- | The dynamic resource specs of a machine (i.e. load or load
76 -- capacity, as opposed to size).
77 data DynUtil = DynUtil
78 { cpuWeight :: Weight -- ^ Standardised CPU usage
79 , memWeight :: Weight -- ^ Standardised memory load
80 , dskWeight :: Weight -- ^ Standardised disk I\/O usage
81 , netWeight :: Weight -- ^ Standardised network usage
84 -- | Initial empty utilisation
86 zeroUtil = DynUtil { cpuWeight = 0, memWeight = 0
87 , dskWeight = 0, netWeight = 0 }
90 baseUtil = DynUtil { cpuWeight = 1, memWeight = 1
91 , dskWeight = 1, netWeight = 1 }
93 addUtil :: DynUtil -> DynUtil -> DynUtil
94 addUtil (DynUtil a1 a2 a3 a4) (DynUtil b1 b2 b3 b4) =
95 DynUtil (a1+b1) (a2+b2) (a3+b3) (a4+b4)
97 subUtil :: DynUtil -> DynUtil -> DynUtil
98 subUtil (DynUtil a1 a2 a3 a4) (DynUtil b1 b2 b3 b4) =
99 DynUtil (a1-b1) (a2-b2) (a3-b3) (a4-b4)
101 -- | The description of an instance placement. It contains the
102 -- instance index, the new primary and secondary node, the move being
103 -- performed and the score of the cluster after the move.
104 type Placement = (Idx, Ndx, Ndx, IMove, Score)
106 -- | An instance move definition
107 data IMove = Failover -- ^ Failover the instance (f)
108 | ReplacePrimary Ndx -- ^ Replace primary (f, r:np, f)
109 | ReplaceSecondary Ndx -- ^ Replace secondary (r:ns)
110 | ReplaceAndFailover Ndx -- ^ Replace secondary, failover (r:np, f)
111 | FailoverAndReplace Ndx -- ^ Failover, replace secondary (f, r:ns)
114 -- | Formatted solution output for one move (involved nodes and
116 type MoveJob = ([Ndx], Idx, IMove, [String])
118 -- | A list of command elements
119 type JobSet = [MoveJob]
121 -- | Connection timeout (when using non-file methods).
125 -- | The default timeout for queries (when using non-file methods).
129 -- | Default vcpu-to-pcpu ratio (randomly chosen value).
130 defVcpuRatio :: Double
133 -- | Default max disk usage ratio.
134 defReservedDiskRatio :: Double
135 defReservedDiskRatio = 0
139 This is similar to the JSON library Result type - *very* similar, but
140 we want to use it in multiple places, so we abstract it into a
149 instance Monad Result where
150 (>>=) (Bad x) _ = Bad x
151 (>>=) (Ok x) fn = fn x
155 -- | Reason for an operation's falure
156 data FailMode = FailMem -- ^ Failed due to not enough RAM
157 | FailDisk -- ^ Failed due to not enough disk
158 | FailCPU -- ^ Failed due to not enough CPU capacity
159 | FailN1 -- ^ Failed due to not passing N1 checks
160 | FailTags -- ^ Failed due to tag exclusion
161 deriving (Eq, Enum, Bounded, Show)
163 -- | List with failure statistics
164 type FailStats = [(FailMode, Int)]
166 -- | Either-like data-type customized for our failure modes
167 data OpResult a = OpFail FailMode -- ^ Failed operation
168 | OpGood a -- ^ Success operation
170 instance Monad OpResult where
171 (OpGood x) >>= fn = fn x
172 (OpFail y) >>= _ = OpFail y
175 -- | A generic class for items that have updateable names and indices.
176 class Element a where
177 -- | Returns the name of the element
178 nameOf :: a -> String
179 -- | Returns the index of the element
181 -- | Updates the name of the element
182 setName :: a -> String -> a
183 -- | Updates the index of the element
184 setIdx :: a -> Int -> a