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{-| Implementation of the Ganeti Query2 server.

-}

{-

Copyright (C) 2012, 2013 Google Inc.

This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301, USA.

-}

module Ganeti.Query.Server

  ( main

  , checkMain

  , prepMain

  ) where

import Control.Applicative

import Control.Concurrent

import Control.Exception

import Control.Monad (forever, when, zipWithM, liftM)

import Control.Monad.IO.Class

import Data.Bits (bitSize)

import qualified Data.Set as Set (toList)

import Data.IORef

import Data.Maybe (fromMaybe)

import qualified Text.JSON as J

import Text.JSON (encode, showJSON, JSValue(..))

import System.Info (arch)

import System.Directory

import qualified Ganeti.Constants as C

import qualified Ganeti.ConstantUtils as ConstantUtils (unFrozenSet)

import Ganeti.Errors

import qualified Ganeti.Path as Path

import Ganeti.Daemon

import Ganeti.Objects

import qualified Ganeti.Config as Config

import Ganeti.ConfigReader

import Ganeti.BasicTypes

import Ganeti.JQueue

import Ganeti.JQScheduler

import Ganeti.Logging

import Ganeti.Luxi

import qualified Ganeti.Query.Language as Qlang

import qualified Ganeti.Query.Cluster as QCluster

import Ganeti.Path ( queueDir, jobQueueLockFile, jobQueueDrainFile

                   , defaultMasterSocket)

import Ganeti.Rpc

import Ganeti.Query.Query

import Ganeti.Query.Filter (makeSimpleFilter)

import Ganeti.Types

import qualified Ganeti.UDSServer as U (Handler(..), listener)

import Ganeti.Utils (lockFile, exitIfBad, watchFile, safeRenameFile)

import qualified Ganeti.Version as Version

-- | Helper for classic queries.

handleClassicQuery :: ConfigData      -- ^ Cluster config

                   -> Qlang.ItemType  -- ^ Query type

                   -> [Either String Integer] -- ^ Requested names

                                              -- (empty means all)

                   -> [String]        -- ^ Requested fields

                   -> Bool            -- ^ Whether to do sync queries or not

                   -> IO (GenericResult GanetiException JSValue)

handleClassicQuery _ _ _ _ True =

  return . Bad $ OpPrereqError "Sync queries are not allowed" ECodeInval

handleClassicQuery cfg qkind names fields _ = do

  let flt = makeSimpleFilter (nameField qkind) names

  qr <- query cfg True (Qlang.Query qkind fields flt)

  return $ showJSON <$> (qr >>= queryCompat)

-- | Minimal wrapper to handle the missing config case.

handleCallWrapper :: MVar () -> JQStatus ->  Result ConfigData

                     -> LuxiOp -> IO (ErrorResult JSValue)

handleCallWrapper _ _ (Bad msg) _ =

  return . Bad . ConfigurationError $

           "I do not have access to a valid configuration, cannot\

           \ process queries: " ++ msg

handleCallWrapper qlock qstat (Ok config) op = handleCall qlock qstat config op

-- | Actual luxi operation handler.

handleCall :: MVar () -> JQStatus

              -> ConfigData -> LuxiOp -> IO (ErrorResult JSValue)

handleCall _ _ cdata QueryClusterInfo =

  let cluster = configCluster cdata

      master = QCluster.clusterMasterNodeName cdata

      hypervisors = clusterEnabledHypervisors cluster

      diskTemplates = clusterEnabledDiskTemplates cluster

      def_hv = case hypervisors of

                 x:_ -> showJSON x

                 [] -> JSNull

      bits = show (bitSize (0::Int)) ++ "bits"

      arch_tuple = [bits, arch]

      obj = [ ("software_version", showJSON C.releaseVersion)

            , ("protocol_version", showJSON C.protocolVersion)

            , ("config_version", showJSON C.configVersion)

            , ("os_api_version", showJSON . maximum .

                                 Set.toList . ConstantUtils.unFrozenSet $

                                 C.osApiVersions)

            , ("export_version", showJSON C.exportVersion)

            , ("vcs_version", showJSON Version.version)

            , ("architecture", showJSON arch_tuple)

            , ("name", showJSON $ clusterClusterName cluster)

            , ("master", showJSON (case master of

                                     Ok name -> name

                                     _ -> undefined))

            , ("default_hypervisor", def_hv)

            , ("enabled_hypervisors", showJSON hypervisors)

            , ("hvparams", showJSON $ clusterHvparams cluster)

            , ("os_hvp", showJSON $ clusterOsHvp cluster)

            , ("beparams", showJSON $ clusterBeparams cluster)

            , ("osparams", showJSON $ clusterOsparams cluster)

            , ("ipolicy", showJSON $ clusterIpolicy cluster)

            , ("nicparams", showJSON $ clusterNicparams cluster)

            , ("ndparams", showJSON $ clusterNdparams cluster)

            , ("diskparams", showJSON $ clusterDiskparams cluster)

            , ("candidate_pool_size",

               showJSON $ clusterCandidatePoolSize cluster)

            , ("max_running_jobs",

               showJSON $ clusterMaxRunningJobs cluster)

            , ("master_netdev",  showJSON $ clusterMasterNetdev cluster)

            , ("master_netmask", showJSON $ clusterMasterNetmask cluster)

            , ("use_external_mip_script",

               showJSON $ clusterUseExternalMipScript cluster)

            , ("volume_group_name",

               maybe JSNull showJSON (clusterVolumeGroupName cluster))

            , ("drbd_usermode_helper",

               maybe JSNull showJSON (clusterDrbdUsermodeHelper cluster))

            , ("file_storage_dir", showJSON $ clusterFileStorageDir cluster)

            , ("shared_file_storage_dir",

               showJSON $ clusterSharedFileStorageDir cluster)

            , ("gluster_storage_dir",

               showJSON $ clusterGlusterStorageDir cluster)

            , ("maintain_node_health",

               showJSON $ clusterMaintainNodeHealth cluster)

            , ("ctime", showJSON $ clusterCtime cluster)

            , ("mtime", showJSON $ clusterMtime cluster)

            , ("uuid", showJSON $ clusterUuid cluster)

            , ("tags", showJSON $ clusterTags cluster)

            , ("uid_pool", showJSON $ clusterUidPool cluster)

            , ("default_iallocator",

               showJSON $ clusterDefaultIallocator cluster)

            , ("default_iallocator_params",

              showJSON $ clusterDefaultIallocatorParams cluster)

            , ("reserved_lvs", showJSON $ clusterReservedLvs cluster)

            , ("primary_ip_version",

               showJSON . ipFamilyToVersion $ clusterPrimaryIpFamily cluster)

            , ("prealloc_wipe_disks",

               showJSON $ clusterPreallocWipeDisks cluster)

            , ("hidden_os", showJSON $ clusterHiddenOs cluster)

            , ("blacklisted_os", showJSON $ clusterBlacklistedOs cluster)

            , ("enabled_disk_templates", showJSON diskTemplates)

            ]

  in case master of

    Ok _ -> return . Ok . J.makeObj $ obj

    Bad ex -> return $ Bad ex

handleCall _ _ cfg (QueryTags kind name) = do

  let tags = case kind of

               TagKindCluster  -> Ok . clusterTags $ configCluster cfg

               TagKindGroup    -> groupTags   <$> Config.getGroup    cfg name

               TagKindNode     -> nodeTags    <$> Config.getNode     cfg name

               TagKindInstance -> instTags    <$> Config.getInstance cfg name

               TagKindNetwork  -> networkTags <$> Config.getNetwork  cfg name

  return (J.showJSON <$> tags)

handleCall _ _ cfg (Query qkind qfields qfilter) = do

  result <- query cfg True (Qlang.Query qkind qfields qfilter)

  return $ J.showJSON <$> result

handleCall _ _ _ (QueryFields qkind qfields) = do

  let result = queryFields (Qlang.QueryFields qkind qfields)

  return $ J.showJSON <$> result

handleCall _ _ cfg (QueryNodes names fields lock) =

  handleClassicQuery cfg (Qlang.ItemTypeOpCode Qlang.QRNode)

    (map Left names) fields lock

handleCall _ _ cfg (QueryInstances names fields lock) =

  handleClassicQuery cfg (Qlang.ItemTypeOpCode Qlang.QRInstance)

    (map Left names) fields lock

handleCall _ _ cfg (QueryGroups names fields lock) =

  handleClassicQuery cfg (Qlang.ItemTypeOpCode Qlang.QRGroup)

    (map Left names) fields lock

handleCall _ _ cfg (QueryJobs names fields) =

  handleClassicQuery cfg (Qlang.ItemTypeLuxi Qlang.QRJob)

    (map (Right . fromIntegral . fromJobId) names)  fields False

handleCall _ _ cfg (QueryNetworks names fields lock) =

  handleClassicQuery cfg (Qlang.ItemTypeOpCode Qlang.QRNetwork)

    (map Left names) fields lock

handleCall _ _ cfg (QueryConfigValues fields) = do

  let params = [ ("cluster_name", return . showJSON . clusterClusterName

                                    . configCluster $ cfg)

               , ("watcher_pause", liftM (maybe JSNull showJSON)

                                     QCluster.isWatcherPaused)

               , ("master_node", return . genericResult (const JSNull) showJSON

                                   $ QCluster.clusterMasterNodeName cfg)

               , ("drain_flag", liftM (showJSON . not) isQueueOpen)

               ] :: [(String, IO JSValue)]

  let answer = map (fromMaybe (return JSNull) . flip lookup params) fields

  answerEval <- sequence answer

  return . Ok . showJSON $ answerEval

handleCall qlock qstat cfg (SubmitJobToDrainedQueue ops) =

  do

    let mcs = Config.getMasterCandidates cfg

    jobid <- allocateJobId mcs qlock

    case jobid of

      Bad s -> return . Bad . GenericError $ s

      Ok jid -> do

        ts <- currentTimestamp

        job <- liftM (setReceivedTimestamp ts)

                 $ queuedJobFromOpCodes jid ops

        qDir <- queueDir

        write_result <- writeJobToDisk qDir job

        case write_result of

          Bad s -> return . Bad . GenericError $ s

          Ok () -> do

            _ <- replicateManyJobs qDir mcs [job]

            _ <- forkIO $ enqueueNewJobs qstat [job]

            return . Ok . showJSON . fromJobId $ jid

handleCall qlock qstat cfg (SubmitJob ops) =

  do

    open <- isQueueOpen

    if not open

       then return . Bad . GenericError $ "Queue drained"

       else handleCall qlock qstat cfg (SubmitJobToDrainedQueue ops)

handleCall qlock qstat cfg (SubmitManyJobs lops) =

  do

    open <- isQueueOpen

    if not open

      then return . Bad . GenericError $ "Queue drained"

      else do

        let mcs = Config.getMasterCandidates cfg

        result_jobids <- allocateJobIds mcs qlock (length lops)

        case result_jobids of

          Bad s -> return . Bad . GenericError $ s

          Ok jids -> do

            ts <- currentTimestamp

            jobs <- liftM (map $ setReceivedTimestamp ts)

                      $ zipWithM queuedJobFromOpCodes jids lops

            qDir <- queueDir

            write_results <- mapM (writeJobToDisk qDir) jobs

            let annotated_results = zip write_results jobs

                succeeded = map snd $ filter (isOk . fst) annotated_results

            when (any isBad write_results) . logWarning

              $ "Writing some jobs failed " ++ show annotated_results

            replicateManyJobs qDir mcs succeeded

            _ <- forkIO $ enqueueNewJobs qstat succeeded

            return . Ok . JSArray

              . map (\(res, job) ->

                      if isOk res

                        then showJSON (True, fromJobId $ qjId job)

                        else showJSON (False, genericResult id (const "") res))

              $ annotated_results

handleCall _ _ cfg (WaitForJobChange jid fields prev_job prev_log tmout) = do

  let compute_fn = computeJobUpdate cfg jid fields prev_log

  qDir <- queueDir

  -- verify if the job is finalized, and return immediately in this case

  jobresult <- loadJobFromDisk qDir False jid

  case jobresult of

    Ok (job, _) | not (jobFinalized job) -> do

      let jobfile = liveJobFile qDir jid

      answer <- watchFile jobfile (min tmout C.luxiWfjcTimeout)

                  (prev_job, JSArray []) compute_fn

      return . Ok $ showJSON answer

    _ -> liftM (Ok . showJSON) compute_fn

handleCall _ _ cfg (SetWatcherPause time) = do

  let mcs = Config.getMasterCandidates cfg

      masters = genericResult (const []) return

                  . Config.getNode cfg . clusterMasterNode

                  $ configCluster cfg

  _ <- executeRpcCall (masters ++ mcs) $ RpcCallSetWatcherPause time

  return . Ok . maybe JSNull showJSON $ time

handleCall _ _ cfg (SetDrainFlag value) = do

  let mcs = Config.getMasterCandidates cfg

  fpath <- jobQueueDrainFile

  if value

     then writeFile fpath ""

     else removeFile fpath

  _ <- executeRpcCall mcs $ RpcCallSetDrainFlag value

  return . Ok . showJSON $ True

handleCall _ qstat cfg (ChangeJobPriority jid prio) = do

  maybeJob <- setJobPriority qstat jid prio

  case maybeJob of

    Bad s -> return . Ok $ showJSON (False, s)

    Ok (Just job) -> runResultT $ do

      let mcs = Config.getMasterCandidates cfg

      qDir <- liftIO queueDir

      liftIO $ replicateManyJobs qDir mcs [job]

      return $ showJSON (True, "Priorities of pending opcodes for job "

                               ++ show (fromJobId jid) ++ " have been changed"

                               ++ " to " ++ show prio)

    Ok Nothing -> runResultT $ do

      -- Job has already started; so we have to forward the request

      -- to the job, currently handled by masterd.

      socketpath <- liftIO defaultMasterSocket

      cl <- liftIO $ getLuxiClient socketpath

      ResultT $ callMethod (ChangeJobPriority jid prio) cl

handleCall _ qstat  cfg (CancelJob jid) = do

  let jName = (++) "job " . show $ fromJobId jid

  dequeueResult <- dequeueJob qstat jid

  case dequeueResult of

    Ok True -> do

      logDebug $ jName ++ " dequeued, marking as canceled"

      qDir <- queueDir

      readResult <- loadJobFromDisk qDir True jid

      let jobFileFailed = return . Ok . showJSON . (,) False

                            . (++) ("Dequeued " ++ jName

                                    ++ ", but failed to mark as cancelled: ")

                          :: String -> IO (ErrorResult JSValue)

      case readResult of

        Bad s -> jobFileFailed s

        Ok (job, _) -> do

          now <- currentTimestamp

          let job' = cancelQueuedJob now job

              mcs = Config.getMasterCandidates cfg

          write_result <- writeJobToDisk qDir job'

          case write_result of

            Bad s -> jobFileFailed s

            Ok () -> do

              replicateManyJobs qDir mcs [job']

              return . Ok . showJSON $ (True, "Dequeued " ++ jName)

    Ok False -> do

      logDebug $ jName ++ " not queued; trying to cancel directly"

      cancelJob jid

    Bad s -> return . Ok . showJSON $ (False, s)

handleCall qlock _ cfg (ArchiveJob jid) = do

  let archiveFailed = putMVar qlock  () >> (return . Ok $ showJSON False)

                      :: IO (ErrorResult JSValue)

  qDir <- queueDir

  takeMVar qlock

  result <- loadJobFromDisk qDir False jid

  case result of

    Bad _ -> archiveFailed

    Ok (job, _) -> if jobFinalized job

                     then do

                       let mcs = Config.getMasterCandidates cfg

                           live = liveJobFile qDir jid

                           archive = archivedJobFile qDir jid

                       renameResult <- safeRenameFile queueDirPermissions

                                         live archive

                       putMVar qlock ()

                       case renameResult of

                         Bad s -> return . Bad . JobQueueError

                                    $ "Archiving failed in an unexpected way: "

                                        ++ s

                         Ok () -> do

                           _ <- executeRpcCall mcs

                                  $ RpcCallJobqueueRename [(live, archive)]

                           return . Ok $ showJSON True

                     else archiveFailed

handleCall qlock _ cfg (AutoArchiveJobs age timeout) = do

  qDir <- queueDir

  eitherJids <- getJobIDs [qDir]

  case eitherJids of

    Left s -> return . Bad . JobQueueError $ show s

    Right jids -> do

      result <- bracket_ (takeMVar qlock) (putMVar qlock ())

                  . archiveJobs cfg age timeout

                  $ sortJobIDs jids

      return . Ok $ showJSON result

handleCall _ _ _ op =

  return . Bad $

    GenericError ("Luxi call '" ++ strOfOp op ++ "' not implemented")

{-# ANN handleCall "HLint: ignore Too strict if" #-}

-- | Query the status of a job and return the requested fields

-- and the logs newer than the given log number.

computeJobUpdate :: ConfigData -> JobId -> [String] -> JSValue

                    -> IO (JSValue, JSValue)

computeJobUpdate cfg jid fields prev_log = do

  let sjid = show $ fromJobId jid

  logDebug $ "Inspecting fields " ++ show fields ++ " of job " ++ sjid

  let fromJSArray (JSArray xs) = xs

      fromJSArray _ = []

  let logFilter JSNull (JSArray _) = True

      logFilter (JSRational _ n) (JSArray (JSRational _ m:_)) = n < m

      logFilter _ _ = False

  let filterLogs n logs = JSArray (filter (logFilter n) (logs >>= fromJSArray))

  jobQuery <- handleClassicQuery cfg (Qlang.ItemTypeLuxi Qlang.QRJob)

                [Right . fromIntegral $ fromJobId jid] ("oplog" : fields) False

  let (rfields, rlogs) = case jobQuery of

        Ok (JSArray [JSArray (JSArray logs : answer)]) ->

          (answer, filterLogs prev_log logs)

        _ -> (map (const JSNull) fields, JSArray [])

  logDebug $ "Updates for job " ++ sjid ++ " are " ++ encode (rfields, rlogs)

  return (JSArray rfields, rlogs)

type LuxiConfig = (MVar (), JQStatus, ConfigReader)

luxiExec

    :: LuxiConfig

    -> LuxiOp

    -> IO (Bool, GenericResult GanetiException JSValue)

luxiExec (qlock, qstat, creader) args = do

  cfg <- creader

  result <- handleCallWrapper qlock qstat cfg args

  return (True, result)

luxiHandler :: LuxiConfig -> U.Handler LuxiOp JSValue

luxiHandler cfg = U.Handler { U.hParse         = decodeLuxiCall

                            , U.hInputLogShort = strOfOp

                            , U.hInputLogLong  = show

                            , U.hExec          = luxiExec cfg

                            }

-- | Type alias for prepMain results

type PrepResult = (Server, IORef (Result ConfigData), JQStatus)

-- | Check function for luxid.

checkMain :: CheckFn ()

checkMain _ = return $ Right ()

-- | Prepare function for luxid.

prepMain :: PrepFn () PrepResult

prepMain _ _ = do

  socket_path <- Path.defaultQuerySocket

  cleanupSocket socket_path

  s <- describeError "binding to the Luxi socket"

         Nothing (Just socket_path) $ getLuxiServer True socket_path

  cref <- newIORef (Bad "Configuration not yet loaded")

  jq <- emptyJQStatus cref

  return (s, cref, jq)

-- | Main function.

main :: MainFn () PrepResult

main _ _ (server, cref, jq) = do

  initConfigReader id cref

  let creader = readIORef cref

  initJQScheduler jq

  qlockFile <- jobQueueLockFile

  lockFile qlockFile >>= exitIfBad "Failed to obtain the job-queue lock"

  qlock <- newMVar ()

  finally

    (forever $ U.listener (luxiHandler (qlock, jq, creader)) server)

    (closeServer server)