root / src / Ganeti / DataCollectors / InstStatus.hs @ 17ae9cdb
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{-| Instance status data collector. |
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-} |
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{- |
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Copyright (C) 2013 Google Inc. |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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02110-1301, USA. |
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-} |
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module Ganeti.DataCollectors.InstStatus |
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( main |
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, options |
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, arguments |
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) where |
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import Control.Exception.Base |
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import Data.Maybe |
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import qualified Data.Map as Map |
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import Network.BSD (getHostName) |
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import qualified Text.JSON as J |
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import qualified Ganeti.BasicTypes as BT |
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import Ganeti.Confd.Client |
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import Ganeti.Confd.Types |
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import Ganeti.Common |
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import Ganeti.DataCollectors.CLI |
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import Ganeti.DataCollectors.InstStatusTypes |
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import Ganeti.DataCollectors.Types |
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import Ganeti.Hypervisor.Xen |
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import Ganeti.Hypervisor.Xen.Types |
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import Ganeti.Logging |
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import Ganeti.Objects |
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import Ganeti.Path |
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import Ganeti.Types |
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import Ganeti.Utils |
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-- * Command line options |
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options :: IO [OptType] |
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options = return |
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[ oConfdAddr |
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, oConfdPort |
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] |
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-- | The list of arguments supported by the program. |
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arguments :: [ArgCompletion] |
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arguments = [] |
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-- | Get the list of instances ([primary], [secondary]) on the given node. |
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-- Implemented as a function, even if used a single time, to specify in a |
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-- convenient and elegant way the return data type, required in order to |
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-- prevent incurring in the monomorphism restriction. |
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-- The server address and the server port parameters are mainly intended |
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-- for testing purposes. If they are Nothing, the default values will be used. |
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getInstances |
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:: String |
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-> Maybe String |
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-> Maybe Int |
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-> IO (BT.Result ([Ganeti.Objects.Instance], [Ganeti.Objects.Instance])) |
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getInstances node srvAddr srvPort = do |
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client <- getConfdClient srvAddr srvPort |
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reply <- query client ReqNodeInstances $ PlainQuery node |
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return $ |
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case fmap (J.readJSON . confdReplyAnswer) reply of |
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Just (J.Ok instances) -> BT.Ok instances |
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Just (J.Error msg) -> BT.Bad msg |
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Nothing -> BT.Bad "No answer from the Confd server" |
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-- | Try to get the reason trail for an instance. In case it is not possible, |
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-- log the failure and return an empty list instead. |
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getReasonTrail :: String -> IO ReasonTrail |
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getReasonTrail instanceName = do |
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fileName <- getInstReasonFilename instanceName |
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content <- try $ readFile fileName |
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case content of |
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Left e -> do |
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logWarning $ |
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"Unable to open the reason trail for instance " ++ instanceName ++ |
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" expected at " ++ fileName ++ ": " ++ show (e :: IOException) |
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return [] |
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Right trailString -> |
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case J.decode trailString of |
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J.Ok t -> return t |
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J.Error msg -> do |
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logWarning $ "Unable to parse the reason trail: " ++ msg |
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return [] |
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-- | Determine the value of the status field for the report of one instance |
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computeStatusField :: AdminState -> ActualState -> DCStatus |
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computeStatusField AdminDown actualState = |
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if actualState `notElem` [ActualShutdown, ActualDying] |
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then DCStatus DCSCBad "The instance is not stopped as it should be" |
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else DCStatus DCSCOk "" |
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computeStatusField AdminUp ActualHung = |
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DCStatus DCSCUnknown "Instance marked as running, but it appears to be hung" |
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computeStatusField AdminUp actualState = |
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if actualState `notElem` [ActualRunning, ActualBlocked] |
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then DCStatus DCSCBad "The instance is not running as it should be" |
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else DCStatus DCSCOk "" |
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computeStatusField AdminOffline _ = |
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-- FIXME: The "offline" status seems not to be used anywhere in the source |
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-- code, but it is defined, so we have to consider it anyway here. |
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DCStatus DCSCUnknown "The instance is marked as offline" |
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-- Builds the status of an instance using runtime information about the Xen |
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-- Domains, their uptime information and the static information provided by |
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-- the ConfD server. |
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buildStatus :: Map.Map String Domain -> Map.Map Int UptimeInfo -> Instance |
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-> IO InstStatus |
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buildStatus domains uptimes inst = do |
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let name = instName inst |
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currDomain = Map.lookup name domains |
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idNum = fmap domId currDomain |
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currUInfo = idNum >>= (`Map.lookup` uptimes) |
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uptime = fmap uInfoUptime currUInfo |
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adminState = instAdminState inst |
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actualState = |
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if adminState == AdminDown && isNothing currDomain |
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then ActualShutdown |
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else case currDomain of |
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(Just dom@(Domain _ _ _ _ (Just isHung))) -> |
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if isHung |
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then ActualHung |
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else domState dom |
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_ -> ActualUnknown |
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status = computeStatusField adminState actualState |
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trail <- getReasonTrail name |
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return $ |
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InstStatus |
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name |
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(instUuid inst) |
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adminState |
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actualState |
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uptime |
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(instMtime inst) |
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trail |
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status |
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-- | Main function. |
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main :: Options -> [String] -> IO () |
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main opts _ = do |
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curNode <- getHostName |
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let node = fromMaybe curNode $ optNode opts |
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answer <- getInstances node (optConfdAddr opts) (optConfdPort opts) |
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inst <- exitIfBad "Can't get instance info from ConfD" answer |
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domains <- getInferredDomInfo |
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uptimes <- getUptimeInfo |
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let primaryInst = fst inst |
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iStatus <- mapM (buildStatus domains uptimes) primaryInst |
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putStrLn $ J.encode iStatus |