root / htools / Ganeti / Luxi.hs @ 6d558717
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1 | a0090487 | Agata Murawska | {-# LANGUAGE TemplateHaskell #-} |
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2 | a0090487 | Agata Murawska | |
3 | 6583e677 | Iustin Pop | {-| Implementation of the Ganeti LUXI interface. |
4 | 6583e677 | Iustin Pop | |
5 | 6583e677 | Iustin Pop | -} |
6 | 6583e677 | Iustin Pop | |
7 | 6583e677 | Iustin Pop | {- |
8 | 6583e677 | Iustin Pop | |
9 | fae980e5 | Iustin Pop | Copyright (C) 2009, 2010, 2011, 2012 Google Inc. |
10 | 6583e677 | Iustin Pop | |
11 | 6583e677 | Iustin Pop | This program is free software; you can redistribute it and/or modify |
12 | 6583e677 | Iustin Pop | it under the terms of the GNU General Public License as published by |
13 | 6583e677 | Iustin Pop | the Free Software Foundation; either version 2 of the License, or |
14 | 6583e677 | Iustin Pop | (at your option) any later version. |
15 | 6583e677 | Iustin Pop | |
16 | 6583e677 | Iustin Pop | This program is distributed in the hope that it will be useful, but |
17 | 6583e677 | Iustin Pop | WITHOUT ANY WARRANTY; without even the implied warranty of |
18 | 6583e677 | Iustin Pop | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
19 | 6583e677 | Iustin Pop | General Public License for more details. |
20 | 6583e677 | Iustin Pop | |
21 | 6583e677 | Iustin Pop | You should have received a copy of the GNU General Public License |
22 | 6583e677 | Iustin Pop | along with this program; if not, write to the Free Software |
23 | 6583e677 | Iustin Pop | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
24 | 6583e677 | Iustin Pop | 02110-1301, USA. |
25 | 6583e677 | Iustin Pop | |
26 | 6583e677 | Iustin Pop | -} |
27 | 6583e677 | Iustin Pop | |
28 | 6583e677 | Iustin Pop | module Ganeti.Luxi |
29 | ebf38064 | Iustin Pop | ( LuxiOp(..) |
30 | 95d0d502 | Iustin Pop | , LuxiReq(..) |
31 | ebf38064 | Iustin Pop | , Client |
32 | ccc817a2 | Iustin Pop | , JobId |
33 | 0aff2293 | Iustin Pop | , RecvResult(..) |
34 | 0aff2293 | Iustin Pop | , strOfOp |
35 | ebf38064 | Iustin Pop | , getClient |
36 | 13f2321c | Iustin Pop | , getServer |
37 | 13f2321c | Iustin Pop | , acceptClient |
38 | ebf38064 | Iustin Pop | , closeClient |
39 | 0aff2293 | Iustin Pop | , closeServer |
40 | ebf38064 | Iustin Pop | , callMethod |
41 | ebf38064 | Iustin Pop | , submitManyJobs |
42 | ebf38064 | Iustin Pop | , queryJobsStatus |
43 | cdd495ae | Iustin Pop | , buildCall |
44 | 0aff2293 | Iustin Pop | , buildResponse |
45 | cdd495ae | Iustin Pop | , validateCall |
46 | cdd495ae | Iustin Pop | , decodeCall |
47 | 13f2321c | Iustin Pop | , recvMsg |
48 | 0aff2293 | Iustin Pop | , recvMsgExt |
49 | 13f2321c | Iustin Pop | , sendMsg |
50 | 471b6c46 | Iustin Pop | , allLuxiCalls |
51 | ebf38064 | Iustin Pop | ) where |
52 | 6583e677 | Iustin Pop | |
53 | 0aff2293 | Iustin Pop | import Control.Exception (catch) |
54 | 6583e677 | Iustin Pop | import Data.IORef |
55 | 76b62028 | Iustin Pop | import Data.Ratio (numerator, denominator) |
56 | e821050d | Iustin Pop | import qualified Data.ByteString as B |
57 | e821050d | Iustin Pop | import qualified Data.ByteString.UTF8 as UTF8 |
58 | e821050d | Iustin Pop | import Data.Word (Word8) |
59 | 6583e677 | Iustin Pop | import Control.Monad |
60 | 0903280b | Iustin Pop | import Text.JSON (encodeStrict, decodeStrict) |
61 | 6583e677 | Iustin Pop | import qualified Text.JSON as J |
62 | 7adb7dff | Iustin Pop | import Text.JSON.Pretty (pp_value) |
63 | 6583e677 | Iustin Pop | import Text.JSON.Types |
64 | 0aff2293 | Iustin Pop | import System.Directory (removeFile) |
65 | e821050d | Iustin Pop | import System.IO (hClose, hFlush, hWaitForInput, Handle, IOMode(..)) |
66 | 0aff2293 | Iustin Pop | import System.IO.Error (isEOFError) |
67 | 6583e677 | Iustin Pop | import System.Timeout |
68 | 6583e677 | Iustin Pop | import qualified Network.Socket as S |
69 | 6583e677 | Iustin Pop | |
70 | 4cd79ca8 | Iustin Pop | import Ganeti.BasicTypes |
71 | 92678b3c | Iustin Pop | import Ganeti.Constants |
72 | 7adb7dff | Iustin Pop | import Ganeti.Errors |
73 | 7adb7dff | Iustin Pop | import Ganeti.JSON |
74 | 9a2ff880 | Iustin Pop | import Ganeti.Jobs (JobStatus) |
75 | 367c4241 | Dato Simó | import Ganeti.OpCodes |
76 | 7adb7dff | Iustin Pop | import Ganeti.Utils |
77 | 4cab6703 | Iustin Pop | import qualified Ganeti.Query.Language as Qlang |
78 | a0090487 | Agata Murawska | import Ganeti.THH |
79 | 9a2ff880 | Iustin Pop | |
80 | 6583e677 | Iustin Pop | -- * Utility functions |
81 | 6583e677 | Iustin Pop | |
82 | 6583e677 | Iustin Pop | -- | Wrapper over System.Timeout.timeout that fails in the IO monad. |
83 | 6583e677 | Iustin Pop | withTimeout :: Int -> String -> IO a -> IO a |
84 | 6583e677 | Iustin Pop | withTimeout secs descr action = do |
85 | ebf38064 | Iustin Pop | result <- timeout (secs * 1000000) action |
86 | 3603605a | Iustin Pop | case result of |
87 | 3603605a | Iustin Pop | Nothing -> fail $ "Timeout in " ++ descr |
88 | 3603605a | Iustin Pop | Just v -> return v |
89 | 6583e677 | Iustin Pop | |
90 | 6583e677 | Iustin Pop | -- * Generic protocol functionality |
91 | 6583e677 | Iustin Pop | |
92 | 0aff2293 | Iustin Pop | -- | Result of receiving a message from the socket. |
93 | 0aff2293 | Iustin Pop | data RecvResult = RecvConnClosed -- ^ Connection closed |
94 | 0aff2293 | Iustin Pop | | RecvError String -- ^ Any other error |
95 | 0aff2293 | Iustin Pop | | RecvOk String -- ^ Successfull receive |
96 | 0aff2293 | Iustin Pop | deriving (Show, Read, Eq) |
97 | 0aff2293 | Iustin Pop | |
98 | ccc817a2 | Iustin Pop | -- | The Ganeti job type. |
99 | 76b62028 | Iustin Pop | type JobId = Int |
100 | ccc817a2 | Iustin Pop | |
101 | a0090487 | Agata Murawska | -- | Currently supported Luxi operations and JSON serialization. |
102 | a0090487 | Agata Murawska | $(genLuxiOp "LuxiOp" |
103 | 72295708 | Iustin Pop | [ (luxiReqQuery, |
104 | 88609f00 | Iustin Pop | [ simpleField "what" [t| Qlang.ItemType |] |
105 | 88609f00 | Iustin Pop | , simpleField "fields" [t| [String] |] |
106 | 88609f00 | Iustin Pop | , simpleField "qfilter" [t| Qlang.Filter Qlang.FilterField |] |
107 | ebf38064 | Iustin Pop | ]) |
108 | 72295708 | Iustin Pop | , (luxiReqQueryFields, |
109 | 88609f00 | Iustin Pop | [ simpleField "what" [t| Qlang.ItemType |] |
110 | 88609f00 | Iustin Pop | , simpleField "fields" [t| [String] |] |
111 | 72295708 | Iustin Pop | ]) |
112 | fae980e5 | Iustin Pop | , (luxiReqQueryNodes, |
113 | 88609f00 | Iustin Pop | [ simpleField "names" [t| [String] |] |
114 | 88609f00 | Iustin Pop | , simpleField "fields" [t| [String] |] |
115 | 88609f00 | Iustin Pop | , simpleField "lock" [t| Bool |] |
116 | ebf38064 | Iustin Pop | ]) |
117 | fae980e5 | Iustin Pop | , (luxiReqQueryGroups, |
118 | 88609f00 | Iustin Pop | [ simpleField "names" [t| [String] |] |
119 | 88609f00 | Iustin Pop | , simpleField "fields" [t| [String] |] |
120 | 88609f00 | Iustin Pop | , simpleField "lock" [t| Bool |] |
121 | ebf38064 | Iustin Pop | ]) |
122 | fae980e5 | Iustin Pop | , (luxiReqQueryInstances, |
123 | 88609f00 | Iustin Pop | [ simpleField "names" [t| [String] |] |
124 | 88609f00 | Iustin Pop | , simpleField "fields" [t| [String] |] |
125 | 88609f00 | Iustin Pop | , simpleField "lock" [t| Bool |] |
126 | ebf38064 | Iustin Pop | ]) |
127 | fae980e5 | Iustin Pop | , (luxiReqQueryJobs, |
128 | 88609f00 | Iustin Pop | [ simpleField "ids" [t| [Int] |] |
129 | 88609f00 | Iustin Pop | , simpleField "fields" [t| [String] |] |
130 | ebf38064 | Iustin Pop | ]) |
131 | fae980e5 | Iustin Pop | , (luxiReqQueryExports, |
132 | 88609f00 | Iustin Pop | [ simpleField "nodes" [t| [String] |] |
133 | 88609f00 | Iustin Pop | , simpleField "lock" [t| Bool |] |
134 | ebf38064 | Iustin Pop | ]) |
135 | fae980e5 | Iustin Pop | , (luxiReqQueryConfigValues, |
136 | 88609f00 | Iustin Pop | [ simpleField "fields" [t| [String] |] ] |
137 | ebf38064 | Iustin Pop | ) |
138 | fae980e5 | Iustin Pop | , (luxiReqQueryClusterInfo, []) |
139 | fae980e5 | Iustin Pop | , (luxiReqQueryTags, |
140 | d8e7c45e | Iustin Pop | [ customField 'decodeTagObject 'encodeTagObject $ |
141 | d8e7c45e | Iustin Pop | simpleField "kind" [t| TagObject |] |
142 | ebf38064 | Iustin Pop | ]) |
143 | fae980e5 | Iustin Pop | , (luxiReqSubmitJob, |
144 | 88609f00 | Iustin Pop | [ simpleField "job" [t| [OpCode] |] ] |
145 | ebf38064 | Iustin Pop | ) |
146 | fae980e5 | Iustin Pop | , (luxiReqSubmitManyJobs, |
147 | 88609f00 | Iustin Pop | [ simpleField "ops" [t| [[OpCode]] |] ] |
148 | ebf38064 | Iustin Pop | ) |
149 | fae980e5 | Iustin Pop | , (luxiReqWaitForJobChange, |
150 | 88609f00 | Iustin Pop | [ simpleField "job" [t| Int |] |
151 | 88609f00 | Iustin Pop | , simpleField "fields" [t| [String]|] |
152 | 88609f00 | Iustin Pop | , simpleField "prev_job" [t| JSValue |] |
153 | 88609f00 | Iustin Pop | , simpleField "prev_log" [t| JSValue |] |
154 | 88609f00 | Iustin Pop | , simpleField "tmout" [t| Int |] |
155 | ebf38064 | Iustin Pop | ]) |
156 | fae980e5 | Iustin Pop | , (luxiReqArchiveJob, |
157 | 88609f00 | Iustin Pop | [ simpleField "job" [t| Int |] ] |
158 | ebf38064 | Iustin Pop | ) |
159 | fae980e5 | Iustin Pop | , (luxiReqAutoArchiveJobs, |
160 | 88609f00 | Iustin Pop | [ simpleField "age" [t| Int |] |
161 | 88609f00 | Iustin Pop | , simpleField "tmout" [t| Int |] |
162 | ebf38064 | Iustin Pop | ]) |
163 | fae980e5 | Iustin Pop | , (luxiReqCancelJob, |
164 | 88609f00 | Iustin Pop | [ simpleField "job" [t| Int |] ] |
165 | ebf38064 | Iustin Pop | ) |
166 | f63ffb37 | Michael Hanselmann | , (luxiReqChangeJobPriority, |
167 | f63ffb37 | Michael Hanselmann | [ simpleField "job" [t| Int |] |
168 | f63ffb37 | Michael Hanselmann | , simpleField "priority" [t| Int |] ] |
169 | f63ffb37 | Michael Hanselmann | ) |
170 | fae980e5 | Iustin Pop | , (luxiReqSetDrainFlag, |
171 | 88609f00 | Iustin Pop | [ simpleField "flag" [t| Bool |] ] |
172 | ebf38064 | Iustin Pop | ) |
173 | fae980e5 | Iustin Pop | , (luxiReqSetWatcherPause, |
174 | 88609f00 | Iustin Pop | [ simpleField "duration" [t| Double |] ] |
175 | ebf38064 | Iustin Pop | ) |
176 | a0090487 | Agata Murawska | ]) |
177 | 6583e677 | Iustin Pop | |
178 | 95d0d502 | Iustin Pop | $(makeJSONInstance ''LuxiReq) |
179 | 95d0d502 | Iustin Pop | |
180 | 471b6c46 | Iustin Pop | -- | List of all defined Luxi calls. |
181 | 471b6c46 | Iustin Pop | $(genAllConstr (drop 3) ''LuxiReq "allLuxiCalls") |
182 | 471b6c46 | Iustin Pop | |
183 | 6583e677 | Iustin Pop | -- | The serialisation of LuxiOps into strings in messages. |
184 | a0090487 | Agata Murawska | $(genStrOfOp ''LuxiOp "strOfOp") |
185 | 6583e677 | Iustin Pop | |
186 | cdd495ae | Iustin Pop | -- | Type holding the initial (unparsed) Luxi call. |
187 | cdd495ae | Iustin Pop | data LuxiCall = LuxiCall LuxiReq JSValue |
188 | cdd495ae | Iustin Pop | |
189 | 6583e677 | Iustin Pop | -- | The end-of-message separator. |
190 | e821050d | Iustin Pop | eOM :: Word8 |
191 | e821050d | Iustin Pop | eOM = 3 |
192 | e821050d | Iustin Pop | |
193 | e821050d | Iustin Pop | -- | The end-of-message encoded as a ByteString. |
194 | e821050d | Iustin Pop | bEOM :: B.ByteString |
195 | e821050d | Iustin Pop | bEOM = B.singleton eOM |
196 | 6583e677 | Iustin Pop | |
197 | 6583e677 | Iustin Pop | -- | Valid keys in the requests and responses. |
198 | 6583e677 | Iustin Pop | data MsgKeys = Method |
199 | 6583e677 | Iustin Pop | | Args |
200 | 6583e677 | Iustin Pop | | Success |
201 | 6583e677 | Iustin Pop | | Result |
202 | 6583e677 | Iustin Pop | |
203 | 6583e677 | Iustin Pop | -- | The serialisation of MsgKeys into strings in messages. |
204 | a0090487 | Agata Murawska | $(genStrOfKey ''MsgKeys "strOfKey") |
205 | 6583e677 | Iustin Pop | |
206 | 6583e677 | Iustin Pop | -- | Luxi client encapsulation. |
207 | e821050d | Iustin Pop | data Client = Client { socket :: Handle -- ^ The socket of the client |
208 | e821050d | Iustin Pop | , rbuf :: IORef B.ByteString -- ^ Already received buffer |
209 | 6583e677 | Iustin Pop | } |
210 | 6583e677 | Iustin Pop | |
211 | 6583e677 | Iustin Pop | -- | Connects to the master daemon and returns a luxi Client. |
212 | 6583e677 | Iustin Pop | getClient :: String -> IO Client |
213 | 6583e677 | Iustin Pop | getClient path = do |
214 | ebf38064 | Iustin Pop | s <- S.socket S.AF_UNIX S.Stream S.defaultProtocol |
215 | 4cd79ca8 | Iustin Pop | withTimeout luxiDefCtmo "creating luxi connection" $ |
216 | ebf38064 | Iustin Pop | S.connect s (S.SockAddrUnix path) |
217 | e821050d | Iustin Pop | rf <- newIORef B.empty |
218 | e821050d | Iustin Pop | h <- S.socketToHandle s ReadWriteMode |
219 | e821050d | Iustin Pop | return Client { socket=h, rbuf=rf } |
220 | 6583e677 | Iustin Pop | |
221 | 13f2321c | Iustin Pop | -- | Creates and returns a server endpoint. |
222 | 13f2321c | Iustin Pop | getServer :: FilePath -> IO S.Socket |
223 | 13f2321c | Iustin Pop | getServer path = do |
224 | 13f2321c | Iustin Pop | s <- S.socket S.AF_UNIX S.Stream S.defaultProtocol |
225 | 13f2321c | Iustin Pop | S.bindSocket s (S.SockAddrUnix path) |
226 | 13f2321c | Iustin Pop | S.listen s 5 -- 5 is the max backlog |
227 | 13f2321c | Iustin Pop | return s |
228 | 13f2321c | Iustin Pop | |
229 | 0aff2293 | Iustin Pop | -- | Closes a server endpoint. |
230 | 0aff2293 | Iustin Pop | -- FIXME: this should be encapsulated into a nicer type. |
231 | 0aff2293 | Iustin Pop | closeServer :: FilePath -> S.Socket -> IO () |
232 | 0aff2293 | Iustin Pop | closeServer path sock = do |
233 | 0aff2293 | Iustin Pop | S.sClose sock |
234 | 0aff2293 | Iustin Pop | removeFile path |
235 | 0aff2293 | Iustin Pop | |
236 | 13f2321c | Iustin Pop | -- | Accepts a client |
237 | 13f2321c | Iustin Pop | acceptClient :: S.Socket -> IO Client |
238 | 13f2321c | Iustin Pop | acceptClient s = do |
239 | 13f2321c | Iustin Pop | -- second return is the address of the client, which we ignore here |
240 | 13f2321c | Iustin Pop | (client_socket, _) <- S.accept s |
241 | 13f2321c | Iustin Pop | new_buffer <- newIORef B.empty |
242 | 13f2321c | Iustin Pop | handle <- S.socketToHandle client_socket ReadWriteMode |
243 | 13f2321c | Iustin Pop | return Client { socket=handle, rbuf=new_buffer } |
244 | 13f2321c | Iustin Pop | |
245 | 6583e677 | Iustin Pop | -- | Closes the client socket. |
246 | 6583e677 | Iustin Pop | closeClient :: Client -> IO () |
247 | e821050d | Iustin Pop | closeClient = hClose . socket |
248 | 6583e677 | Iustin Pop | |
249 | 6583e677 | Iustin Pop | -- | Sends a message over a luxi transport. |
250 | 6583e677 | Iustin Pop | sendMsg :: Client -> String -> IO () |
251 | 4cd79ca8 | Iustin Pop | sendMsg s buf = withTimeout luxiDefRwto "sending luxi message" $ do |
252 | e821050d | Iustin Pop | let encoded = UTF8.fromString buf |
253 | e821050d | Iustin Pop | handle = socket s |
254 | e821050d | Iustin Pop | B.hPut handle encoded |
255 | e821050d | Iustin Pop | B.hPut handle bEOM |
256 | e821050d | Iustin Pop | hFlush handle |
257 | e821050d | Iustin Pop | |
258 | e821050d | Iustin Pop | -- | Given a current buffer and the handle, it will read from the |
259 | e821050d | Iustin Pop | -- network until we get a full message, and it will return that |
260 | e821050d | Iustin Pop | -- message and the leftover buffer contents. |
261 | e821050d | Iustin Pop | recvUpdate :: Handle -> B.ByteString -> IO (B.ByteString, B.ByteString) |
262 | e821050d | Iustin Pop | recvUpdate handle obuf = do |
263 | 4cd79ca8 | Iustin Pop | nbuf <- withTimeout luxiDefRwto "reading luxi response" $ do |
264 | e821050d | Iustin Pop | _ <- hWaitForInput handle (-1) |
265 | e821050d | Iustin Pop | B.hGetNonBlocking handle 4096 |
266 | e821050d | Iustin Pop | let (msg, remaining) = B.break (eOM ==) nbuf |
267 | e821050d | Iustin Pop | newbuf = B.append obuf msg |
268 | e821050d | Iustin Pop | if B.null remaining |
269 | e821050d | Iustin Pop | then recvUpdate handle newbuf |
270 | e821050d | Iustin Pop | else return (newbuf, B.tail remaining) |
271 | 6583e677 | Iustin Pop | |
272 | 6583e677 | Iustin Pop | -- | Waits for a message over a luxi transport. |
273 | 6583e677 | Iustin Pop | recvMsg :: Client -> IO String |
274 | 6583e677 | Iustin Pop | recvMsg s = do |
275 | 6583e677 | Iustin Pop | cbuf <- readIORef $ rbuf s |
276 | e821050d | Iustin Pop | let (imsg, ibuf) = B.break (eOM ==) cbuf |
277 | 95f490de | Iustin Pop | (msg, nbuf) <- |
278 | e821050d | Iustin Pop | if B.null ibuf -- if old buffer didn't contain a full message |
279 | e821050d | Iustin Pop | then recvUpdate (socket s) cbuf -- then we read from network |
280 | e821050d | Iustin Pop | else return (imsg, B.tail ibuf) -- else we return data from our buffer |
281 | 6583e677 | Iustin Pop | writeIORef (rbuf s) nbuf |
282 | e821050d | Iustin Pop | return $ UTF8.toString msg |
283 | 6583e677 | Iustin Pop | |
284 | 0aff2293 | Iustin Pop | -- | Extended wrapper over recvMsg. |
285 | 0aff2293 | Iustin Pop | recvMsgExt :: Client -> IO RecvResult |
286 | 0aff2293 | Iustin Pop | recvMsgExt s = |
287 | 7ae5d703 | Iustin Pop | Control.Exception.catch (liftM RecvOk (recvMsg s)) $ \e -> |
288 | 66ad857a | Iustin Pop | return $ if isEOFError e |
289 | 66ad857a | Iustin Pop | then RecvConnClosed |
290 | 66ad857a | Iustin Pop | else RecvError (show e) |
291 | 0aff2293 | Iustin Pop | |
292 | 6583e677 | Iustin Pop | -- | Serialize a request to String. |
293 | 6583e677 | Iustin Pop | buildCall :: LuxiOp -- ^ The method |
294 | 6583e677 | Iustin Pop | -> String -- ^ The serialized form |
295 | 683b1ca7 | Iustin Pop | buildCall lo = |
296 | 2cdaf225 | Iustin Pop | let ja = [ (strOfKey Method, J.showJSON $ strOfOp lo) |
297 | 2cdaf225 | Iustin Pop | , (strOfKey Args, opToArgs lo) |
298 | ebf38064 | Iustin Pop | ] |
299 | ebf38064 | Iustin Pop | jo = toJSObject ja |
300 | ebf38064 | Iustin Pop | in encodeStrict jo |
301 | 6583e677 | Iustin Pop | |
302 | 0aff2293 | Iustin Pop | -- | Serialize the response to String. |
303 | 0aff2293 | Iustin Pop | buildResponse :: Bool -- ^ Success |
304 | 0aff2293 | Iustin Pop | -> JSValue -- ^ The arguments |
305 | 0aff2293 | Iustin Pop | -> String -- ^ The serialized form |
306 | 0aff2293 | Iustin Pop | buildResponse success args = |
307 | 0aff2293 | Iustin Pop | let ja = [ (strOfKey Success, JSBool success) |
308 | 0aff2293 | Iustin Pop | , (strOfKey Result, args)] |
309 | 0aff2293 | Iustin Pop | jo = toJSObject ja |
310 | 0aff2293 | Iustin Pop | in encodeStrict jo |
311 | 0aff2293 | Iustin Pop | |
312 | cdd495ae | Iustin Pop | -- | Check that luxi request contains the required keys and parse it. |
313 | cdd495ae | Iustin Pop | validateCall :: String -> Result LuxiCall |
314 | cdd495ae | Iustin Pop | validateCall s = do |
315 | 0aff2293 | Iustin Pop | arr <- fromJResult "parsing top-level luxi message" $ |
316 | 0aff2293 | Iustin Pop | decodeStrict s::Result (JSObject JSValue) |
317 | cdd495ae | Iustin Pop | let aobj = fromJSObject arr |
318 | cdd495ae | Iustin Pop | call <- fromObj aobj (strOfKey Method)::Result LuxiReq |
319 | cdd495ae | Iustin Pop | args <- fromObj aobj (strOfKey Args) |
320 | cdd495ae | Iustin Pop | return (LuxiCall call args) |
321 | cdd495ae | Iustin Pop | |
322 | cdd495ae | Iustin Pop | -- | Converts Luxi call arguments into a 'LuxiOp' data structure. |
323 | cdd495ae | Iustin Pop | -- |
324 | cdd495ae | Iustin Pop | -- This is currently hand-coded until we make it more uniform so that |
325 | cdd495ae | Iustin Pop | -- it can be generated using TH. |
326 | cdd495ae | Iustin Pop | decodeCall :: LuxiCall -> Result LuxiOp |
327 | cdd495ae | Iustin Pop | decodeCall (LuxiCall call args) = |
328 | cdd495ae | Iustin Pop | case call of |
329 | cdd495ae | Iustin Pop | ReqQueryJobs -> do |
330 | cdd495ae | Iustin Pop | (jid, jargs) <- fromJVal args |
331 | 76b62028 | Iustin Pop | rid <- mapM parseJobId jid |
332 | cdd495ae | Iustin Pop | let rargs = map fromJSString jargs |
333 | cdd495ae | Iustin Pop | return $ QueryJobs rid rargs |
334 | cdd495ae | Iustin Pop | ReqQueryInstances -> do |
335 | cdd495ae | Iustin Pop | (names, fields, locking) <- fromJVal args |
336 | cdd495ae | Iustin Pop | return $ QueryInstances names fields locking |
337 | cdd495ae | Iustin Pop | ReqQueryNodes -> do |
338 | cdd495ae | Iustin Pop | (names, fields, locking) <- fromJVal args |
339 | cdd495ae | Iustin Pop | return $ QueryNodes names fields locking |
340 | cdd495ae | Iustin Pop | ReqQueryGroups -> do |
341 | cdd495ae | Iustin Pop | (names, fields, locking) <- fromJVal args |
342 | cdd495ae | Iustin Pop | return $ QueryGroups names fields locking |
343 | 5b11f8db | Iustin Pop | ReqQueryClusterInfo -> |
344 | cdd495ae | Iustin Pop | return QueryClusterInfo |
345 | cdd495ae | Iustin Pop | ReqQuery -> do |
346 | 9a94c848 | Iustin Pop | (what, fields, qfilter) <- fromJVal args |
347 | 9a94c848 | Iustin Pop | return $ Query what fields qfilter |
348 | 72295708 | Iustin Pop | ReqQueryFields -> do |
349 | 72295708 | Iustin Pop | (what, fields) <- fromJVal args |
350 | 72295708 | Iustin Pop | fields' <- case fields of |
351 | 72295708 | Iustin Pop | JSNull -> return [] |
352 | 72295708 | Iustin Pop | _ -> fromJVal fields |
353 | 72295708 | Iustin Pop | return $ QueryFields what fields' |
354 | cdd495ae | Iustin Pop | ReqSubmitJob -> do |
355 | cdd495ae | Iustin Pop | [ops1] <- fromJVal args |
356 | cdd495ae | Iustin Pop | ops2 <- mapM (fromJResult (luxiReqToRaw call) . J.readJSON) ops1 |
357 | cdd495ae | Iustin Pop | return $ SubmitJob ops2 |
358 | cdd495ae | Iustin Pop | ReqSubmitManyJobs -> do |
359 | cdd495ae | Iustin Pop | [ops1] <- fromJVal args |
360 | cdd495ae | Iustin Pop | ops2 <- mapM (fromJResult (luxiReqToRaw call) . J.readJSON) ops1 |
361 | cdd495ae | Iustin Pop | return $ SubmitManyJobs ops2 |
362 | cdd495ae | Iustin Pop | ReqWaitForJobChange -> do |
363 | cdd495ae | Iustin Pop | (jid, fields, pinfo, pidx, wtmout) <- |
364 | cdd495ae | Iustin Pop | -- No instance for 5-tuple, code copied from the |
365 | cdd495ae | Iustin Pop | -- json sources and adapted |
366 | cdd495ae | Iustin Pop | fromJResult "Parsing WaitForJobChange message" $ |
367 | cdd495ae | Iustin Pop | case args of |
368 | cdd495ae | Iustin Pop | JSArray [a, b, c, d, e] -> |
369 | cdd495ae | Iustin Pop | (,,,,) `fmap` |
370 | cdd495ae | Iustin Pop | J.readJSON a `ap` |
371 | cdd495ae | Iustin Pop | J.readJSON b `ap` |
372 | cdd495ae | Iustin Pop | J.readJSON c `ap` |
373 | cdd495ae | Iustin Pop | J.readJSON d `ap` |
374 | cdd495ae | Iustin Pop | J.readJSON e |
375 | cdd495ae | Iustin Pop | _ -> J.Error "Not enough values" |
376 | 76b62028 | Iustin Pop | rid <- parseJobId jid |
377 | cdd495ae | Iustin Pop | return $ WaitForJobChange rid fields pinfo pidx wtmout |
378 | cdd495ae | Iustin Pop | ReqArchiveJob -> do |
379 | cdd495ae | Iustin Pop | [jid] <- fromJVal args |
380 | 76b62028 | Iustin Pop | rid <- parseJobId jid |
381 | cdd495ae | Iustin Pop | return $ ArchiveJob rid |
382 | cdd495ae | Iustin Pop | ReqAutoArchiveJobs -> do |
383 | cdd495ae | Iustin Pop | (age, tmout) <- fromJVal args |
384 | cdd495ae | Iustin Pop | return $ AutoArchiveJobs age tmout |
385 | cdd495ae | Iustin Pop | ReqQueryExports -> do |
386 | cdd495ae | Iustin Pop | (nodes, lock) <- fromJVal args |
387 | cdd495ae | Iustin Pop | return $ QueryExports nodes lock |
388 | cdd495ae | Iustin Pop | ReqQueryConfigValues -> do |
389 | cdd495ae | Iustin Pop | [fields] <- fromJVal args |
390 | cdd495ae | Iustin Pop | return $ QueryConfigValues fields |
391 | cdd495ae | Iustin Pop | ReqQueryTags -> do |
392 | cdd495ae | Iustin Pop | (kind, name) <- fromJVal args |
393 | d8e7c45e | Iustin Pop | item <- tagObjectFrom kind name |
394 | d8e7c45e | Iustin Pop | return $ QueryTags item |
395 | cdd495ae | Iustin Pop | ReqCancelJob -> do |
396 | cdd495ae | Iustin Pop | [job] <- fromJVal args |
397 | 76b62028 | Iustin Pop | rid <- parseJobId job |
398 | cdd495ae | Iustin Pop | return $ CancelJob rid |
399 | f63ffb37 | Michael Hanselmann | ReqChangeJobPriority -> do |
400 | f63ffb37 | Michael Hanselmann | (job, priority) <- fromJVal args |
401 | f63ffb37 | Michael Hanselmann | rid <- parseJobId job |
402 | f63ffb37 | Michael Hanselmann | return $ ChangeJobPriority rid priority |
403 | cdd495ae | Iustin Pop | ReqSetDrainFlag -> do |
404 | cdd495ae | Iustin Pop | [flag] <- fromJVal args |
405 | cdd495ae | Iustin Pop | return $ SetDrainFlag flag |
406 | cdd495ae | Iustin Pop | ReqSetWatcherPause -> do |
407 | cdd495ae | Iustin Pop | [duration] <- fromJVal args |
408 | cdd495ae | Iustin Pop | return $ SetWatcherPause duration |
409 | cdd495ae | Iustin Pop | |
410 | 6583e677 | Iustin Pop | -- | Check that luxi responses contain the required keys and that the |
411 | 6583e677 | Iustin Pop | -- call was successful. |
412 | 7adb7dff | Iustin Pop | validateResult :: String -> ErrorResult JSValue |
413 | 6583e677 | Iustin Pop | validateResult s = do |
414 | e821050d | Iustin Pop | when (UTF8.replacement_char `elem` s) $ |
415 | e821050d | Iustin Pop | fail "Failed to decode UTF-8, detected replacement char after decoding" |
416 | 7adb7dff | Iustin Pop | oarr <- fromJResult "Parsing LUXI response" (decodeStrict s) |
417 | 262f3e6c | Iustin Pop | let arr = J.fromJSObject oarr |
418 | 7adb7dff | Iustin Pop | status <- fromObj arr (strOfKey Success) |
419 | 7adb7dff | Iustin Pop | result <- fromObj arr (strOfKey Result) |
420 | 3603605a | Iustin Pop | if status |
421 | 7adb7dff | Iustin Pop | then return result |
422 | 7adb7dff | Iustin Pop | else decodeError result |
423 | 7adb7dff | Iustin Pop | |
424 | 7adb7dff | Iustin Pop | -- | Try to decode an error from the server response. This function |
425 | 7adb7dff | Iustin Pop | -- will always fail, since it's called only on the error path (when |
426 | 7adb7dff | Iustin Pop | -- status is False). |
427 | 7adb7dff | Iustin Pop | decodeError :: JSValue -> ErrorResult JSValue |
428 | 7adb7dff | Iustin Pop | decodeError val = |
429 | 7adb7dff | Iustin Pop | case fromJVal val of |
430 | 7adb7dff | Iustin Pop | Ok e -> Bad e |
431 | 7adb7dff | Iustin Pop | Bad msg -> Bad $ GenericError msg |
432 | 6583e677 | Iustin Pop | |
433 | 6583e677 | Iustin Pop | -- | Generic luxi method call. |
434 | 7adb7dff | Iustin Pop | callMethod :: LuxiOp -> Client -> IO (ErrorResult JSValue) |
435 | 683b1ca7 | Iustin Pop | callMethod method s = do |
436 | 683b1ca7 | Iustin Pop | sendMsg s $ buildCall method |
437 | 6583e677 | Iustin Pop | result <- recvMsg s |
438 | 6583e677 | Iustin Pop | let rval = validateResult result |
439 | 6583e677 | Iustin Pop | return rval |
440 | 9a2ff880 | Iustin Pop | |
441 | 619e89c8 | Iustin Pop | -- | Parses a job ID. |
442 | 619e89c8 | Iustin Pop | parseJobId :: JSValue -> Result JobId |
443 | 76b62028 | Iustin Pop | parseJobId (JSString x) = tryRead "parsing job id" . fromJSString $ x |
444 | 76b62028 | Iustin Pop | parseJobId (JSRational _ x) = |
445 | 76b62028 | Iustin Pop | if denominator x /= 1 |
446 | 76b62028 | Iustin Pop | then Bad $ "Got fractional job ID from master daemon?! Value:" ++ show x |
447 | 76b62028 | Iustin Pop | -- FIXME: potential integer overflow here on 32-bit platforms |
448 | 76b62028 | Iustin Pop | else Ok . fromIntegral . numerator $ x |
449 | 619e89c8 | Iustin Pop | parseJobId x = Bad $ "Wrong type/value for job id: " ++ show x |
450 | 619e89c8 | Iustin Pop | |
451 | 619e89c8 | Iustin Pop | -- | Parse job submission result. |
452 | 7adb7dff | Iustin Pop | parseSubmitJobResult :: JSValue -> ErrorResult JobId |
453 | 7adb7dff | Iustin Pop | parseSubmitJobResult (JSArray [JSBool True, v]) = |
454 | 7adb7dff | Iustin Pop | case parseJobId v of |
455 | 7adb7dff | Iustin Pop | Bad msg -> Bad $ LuxiError msg |
456 | 7adb7dff | Iustin Pop | Ok v' -> Ok v' |
457 | 619e89c8 | Iustin Pop | parseSubmitJobResult (JSArray [JSBool False, JSString x]) = |
458 | 7adb7dff | Iustin Pop | Bad . LuxiError $ fromJSString x |
459 | 7adb7dff | Iustin Pop | parseSubmitJobResult v = |
460 | 7adb7dff | Iustin Pop | Bad . LuxiError $ "Unknown result from the master daemon: " ++ |
461 | 7adb7dff | Iustin Pop | show (pp_value v) |
462 | 619e89c8 | Iustin Pop | |
463 | 9a2ff880 | Iustin Pop | -- | Specialized submitManyJobs call. |
464 | 7adb7dff | Iustin Pop | submitManyJobs :: Client -> [[OpCode]] -> IO (ErrorResult [JobId]) |
465 | 9a2ff880 | Iustin Pop | submitManyJobs s jobs = do |
466 | 683b1ca7 | Iustin Pop | rval <- callMethod (SubmitManyJobs jobs) s |
467 | 9a2ff880 | Iustin Pop | -- map each result (status, payload) pair into a nice Result ADT |
468 | 9a2ff880 | Iustin Pop | return $ case rval of |
469 | 9a2ff880 | Iustin Pop | Bad x -> Bad x |
470 | 619e89c8 | Iustin Pop | Ok (JSArray r) -> mapM parseSubmitJobResult r |
471 | 7adb7dff | Iustin Pop | x -> Bad . LuxiError $ |
472 | 7adb7dff | Iustin Pop | "Cannot parse response from Ganeti: " ++ show x |
473 | 9a2ff880 | Iustin Pop | |
474 | 9a2ff880 | Iustin Pop | -- | Custom queryJobs call. |
475 | 7adb7dff | Iustin Pop | queryJobsStatus :: Client -> [JobId] -> IO (ErrorResult [JobStatus]) |
476 | 9a2ff880 | Iustin Pop | queryJobsStatus s jids = do |
477 | 76b62028 | Iustin Pop | rval <- callMethod (QueryJobs jids ["status"]) s |
478 | 9a2ff880 | Iustin Pop | return $ case rval of |
479 | 9a2ff880 | Iustin Pop | Bad x -> Bad x |
480 | 9a2ff880 | Iustin Pop | Ok y -> case J.readJSON y::(J.Result [[JobStatus]]) of |
481 | 9a2ff880 | Iustin Pop | J.Ok vals -> if any null vals |
482 | 7adb7dff | Iustin Pop | then Bad $ |
483 | 7adb7dff | Iustin Pop | LuxiError "Missing job status field" |
484 | 9a2ff880 | Iustin Pop | else Ok (map head vals) |
485 | 7adb7dff | Iustin Pop | J.Error x -> Bad $ LuxiError x |