root / src / Ganeti / Monitoring / Server.hs @ eb65c915
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{-# LANGUAGE OverloadedStrings #-} |
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{-| Implementation of the Ganeti confd server functionality. |
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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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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.Monitoring.Server |
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( main |
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, checkMain |
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, prepMain |
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) where |
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import Snap.Core |
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import Snap.Http.Server |
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import Data.Text |
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import qualified Text.JSON as J |
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import Ganeti.Daemon |
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import qualified Ganeti.Constants as C |
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-- * Types and constants definitions |
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-- | Type alias for checkMain results. |
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type CheckResult = () |
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-- | Type alias for prepMain results. |
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type PrepResult = Config Snap () |
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-- | Version of the latest supported http API. |
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latestAPIVersion :: Int |
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latestAPIVersion = 1 |
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-- * Configuration handling |
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-- | The default configuration for the HTTP server. |
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defaultHttpConf :: Config Snap () |
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defaultHttpConf = |
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setAccessLog (ConfigFileLog C.daemonsExtraLogfilesGanetiMondAccess) . |
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setCompression False . |
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setErrorLog (ConfigFileLog C.daemonsExtraLogfilesGanetiMondError) $ |
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setVerbose False |
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emptyConfig |
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-- * Helper functions |
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-- | Check function for the monitoring agent. |
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checkMain :: CheckFn CheckResult |
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checkMain _ = return $ Right () |
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-- | Prepare function for monitoring agent. |
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prepMain :: PrepFn CheckResult PrepResult |
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prepMain opts _ = |
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return $ |
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setPort (maybe C.defaultMondPort fromIntegral (optPort opts)) |
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defaultHttpConf |
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-- * Query answers |
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-- | Reply to the supported API version numbers query. |
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versionQ :: Snap () |
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versionQ = writeText . pack $ J.encode [latestAPIVersion] |
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-- | The function implementing the HTTP API of the monitoring agent. |
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-- TODO: Currently it only replies to the API version query: implement all the |
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-- missing features. |
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monitoringApi :: Snap () |
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monitoringApi = |
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ifTop versionQ |
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-- | Main function. |
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main :: MainFn CheckResult PrepResult |
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main _ _ httpConf = |
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httpServe httpConf monitoringApi |