root / hail.hs @ 8880d889
History | View | Annotate | Download (4.5 kB)
1 |
{-| Solver for N+1 cluster errors |
---|---|
2 |
|
3 |
-} |
4 |
|
5 |
{- |
6 |
|
7 |
Copyright (C) 2009 Google Inc. |
8 |
|
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. |
13 |
|
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. |
18 |
|
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 |
22 |
02110-1301, USA. |
23 |
|
24 |
-} |
25 |
|
26 |
module Main (main) where |
27 |
|
28 |
import Data.List |
29 |
import Data.Function |
30 |
import Monad |
31 |
import System |
32 |
import System.IO |
33 |
import System.Console.GetOpt |
34 |
import qualified System |
35 |
|
36 |
import Text.Printf (printf) |
37 |
|
38 |
import qualified Ganeti.HTools.Cluster as Cluster |
39 |
import qualified Ganeti.HTools.Node as Node |
40 |
import qualified Ganeti.HTools.Instance as Instance |
41 |
import qualified Ganeti.HTools.CLI as CLI |
42 |
import Ganeti.HTools.IAlloc |
43 |
import Ganeti.HTools.Types |
44 |
import Ganeti.HTools.Loader (RqType(..), Request(..)) |
45 |
|
46 |
-- | Command line options structure. |
47 |
data Options = Options |
48 |
{ optShowVer :: Bool -- ^ Just show the program version |
49 |
, optShowHelp :: Bool -- ^ Just show the help |
50 |
} deriving Show |
51 |
|
52 |
-- | Default values for the command line options. |
53 |
defaultOptions :: Options |
54 |
defaultOptions = Options |
55 |
{ optShowVer = False |
56 |
, optShowHelp = False |
57 |
} |
58 |
|
59 |
instance CLI.CLIOptions Options where |
60 |
showVersion = optShowVer |
61 |
showHelp = optShowHelp |
62 |
|
63 |
-- | Options list and functions |
64 |
options :: [OptDescr (Options -> Options)] |
65 |
options = |
66 |
[ Option ['V'] ["version"] |
67 |
(NoArg (\ opts -> opts { optShowVer = True})) |
68 |
"show the version of the program" |
69 |
, Option ['h'] ["help"] |
70 |
(NoArg (\ opts -> opts { optShowHelp = True})) |
71 |
"show help" |
72 |
] |
73 |
|
74 |
|
75 |
filterFails :: (Monad m) => |
76 |
[OpResult (Node.List, Instance.Instance, [Node.Node])] |
77 |
-> m [(Node.List, [Node.Node])] |
78 |
filterFails sols = |
79 |
if null sols then fail "No nodes onto which to allocate at all" |
80 |
else let sols' = concatMap (\ e -> |
81 |
case e of |
82 |
OpFail _ -> [] |
83 |
OpGood (gnl, _, nn) -> [(gnl, nn)] |
84 |
) sols |
85 |
in |
86 |
if null sols' |
87 |
then fail "No valid allocation solutions" |
88 |
else return sols' |
89 |
|
90 |
processResults :: (Monad m) => [(Node.List, [Node.Node])] |
91 |
-> m (String, [Node.Node]) |
92 |
processResults sols = |
93 |
let sols' = map (\(nl', ns) -> (Cluster.compCV nl', ns)) sols |
94 |
sols'' = sortBy (compare `on` fst) sols' |
95 |
(best, w) = head sols'' |
96 |
(worst, l) = last sols'' |
97 |
info = printf "Valid results: %d, best score: %.8f for node(s) %s, \ |
98 |
\worst score: %.8f for node(s) %s" (length sols'') |
99 |
best (intercalate "/" . map Node.name $ w) |
100 |
worst (intercalate "/" . map Node.name $ l)::String |
101 |
in return (info, w) |
102 |
|
103 |
-- | Process a request and return new node lists |
104 |
processRequest :: Request |
105 |
-> Result [OpResult (Node.List, Instance.Instance, [Node.Node])] |
106 |
processRequest request = |
107 |
let Request rqtype nl il _ = request |
108 |
in case rqtype of |
109 |
Allocate xi reqn -> Cluster.tryAlloc nl il xi reqn |
110 |
Relocate idx reqn exnodes -> Cluster.tryReloc nl il idx reqn exnodes |
111 |
|
112 |
-- | Main function. |
113 |
main :: IO () |
114 |
main = do |
115 |
cmd_args <- System.getArgs |
116 |
(_, args) <- CLI.parseOpts cmd_args "hail" options defaultOptions |
117 |
|
118 |
when (null args) $ do |
119 |
hPutStrLn stderr "Error: this program needs an input file." |
120 |
exitWith $ ExitFailure 1 |
121 |
|
122 |
let input_file = head args |
123 |
input_data <- readFile input_file |
124 |
|
125 |
request <- case (parseData input_data) of |
126 |
Bad err -> do |
127 |
hPutStrLn stderr $ "Error: " ++ err |
128 |
exitWith $ ExitFailure 1 |
129 |
Ok rq -> return rq |
130 |
|
131 |
let Request _ _ _ csf = request |
132 |
sols = processRequest request >>= filterFails >>= processResults |
133 |
let (ok, info, rn) = case sols of |
134 |
Ok (info, sn) -> (True, "Request successful: " ++ info, |
135 |
map ((++ csf) . Node.name) sn) |
136 |
Bad s -> (False, "Request failed: " ++ s, []) |
137 |
resp = formatResponse ok info rn |
138 |
putStrLn resp |