Synnefo » snf-ganeti

{-| Parsing data from text-files.

This module holds the code for loading the cluster state from text

files, as produced by @gnt-node@ and @gnt-instance@ @list@ command.

-}

{-

Copyright (C) 2009, 2010, 2011, 2012 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.HTools.Text

  ( loadData

  , parseData

  , loadInst

  , loadNode

  , loadISpec

  , loadIPolicy

  , serializeInstances

  , serializeNode

  , serializeNodes

  , serializeGroup

  , serializeISpec

  , serializeIPolicy

  , serializeCluster

  ) where

import Control.Monad

import Data.List

import Text.Printf (printf)

import Ganeti.HTools.Utils

import Ganeti.HTools.Loader

import Ganeti.HTools.Types

import qualified Ganeti.HTools.Container as Container

import qualified Ganeti.HTools.Group as Group

import qualified Ganeti.HTools.Node as Node

import qualified Ganeti.HTools.Instance as Instance

-- * Helper functions

-- | Simple wrapper over sepSplit

commaSplit :: String -> [String]

commaSplit = sepSplit ','

-- * Serialisation functions

-- | Serialize a single group.

serializeGroup :: Group.Group -> String

serializeGroup grp =

  printf "%s|%s|%s" (Group.name grp) (Group.uuid grp)

           (allocPolicyToRaw (Group.allocPolicy grp))

-- | Generate group file data from a group list.

serializeGroups :: Group.List -> String

serializeGroups = unlines . map serializeGroup . Container.elems

-- | Serialize a single node.

serializeNode :: Group.List -- ^ The list of groups (needed for group uuid)

              -> Node.Node  -- ^ The node to be serialised

              -> String

serializeNode gl node =

  printf "%s|%.0f|%d|%d|%.0f|%d|%.0f|%c|%s" (Node.name node)

           (Node.tMem node) (Node.nMem node) (Node.fMem node)

           (Node.tDsk node) (Node.fDsk node) (Node.tCpu node)

           (if Node.offline node then 'Y' else 'N')

           (Group.uuid grp)

    where grp = Container.find (Node.group node) gl

-- | Generate node file data from node objects.

serializeNodes :: Group.List -> Node.List -> String

serializeNodes gl = unlines . map (serializeNode gl) . Container.elems

-- | Serialize a single instance.

serializeInstance :: Node.List         -- ^ The node list (needed for

                                       -- node names)

                  -> Instance.Instance -- ^ The instance to be serialised

                  -> String

serializeInstance nl inst =

  let iname = Instance.name inst

      pnode = Container.nameOf nl (Instance.pNode inst)

      sidx = Instance.sNode inst

      snode = (if sidx == Node.noSecondary

                 then ""

                 else Container.nameOf nl sidx)

  in printf "%s|%d|%d|%d|%s|%s|%s|%s|%s|%s"

       iname (Instance.mem inst) (Instance.dsk inst)

       (Instance.vcpus inst) (instanceStatusToRaw (Instance.runSt inst))

       (if Instance.autoBalance inst then "Y" else "N")

       pnode snode (diskTemplateToRaw (Instance.diskTemplate inst))

       (intercalate "," (Instance.tags inst))

-- | Generate instance file data from instance objects.

serializeInstances :: Node.List -> Instance.List -> String

serializeInstances nl =

  unlines . map (serializeInstance nl) . Container.elems

-- | Generate a spec data from a given ISpec object.

serializeISpec :: ISpec -> String

serializeISpec ispec =

  -- this needs to be kept in sync with the object definition

  let ISpec mem_s cpu_c disk_s disk_c nic_c = ispec

      strings = [show mem_s, show cpu_c, show disk_s, show disk_c, show nic_c]

  in intercalate "," strings

-- | Generate disk template data.

serializeDiskTemplates :: [DiskTemplate] -> String

serializeDiskTemplates = intercalate "," . map diskTemplateToRaw

-- | Generate policy data from a given policy object.

serializeIPolicy :: String -> IPolicy -> String

serializeIPolicy owner ipol =

  let IPolicy stdspec minspec maxspec dts vcpu_ratio = ipol

      strings = [ owner

                , serializeISpec stdspec

                , serializeISpec minspec

                , serializeISpec maxspec

                , serializeDiskTemplates dts

                , show vcpu_ratio

                ]

  in intercalate "|" strings

-- | Generates the entire ipolicy section from the cluster and group

-- objects.

serializeAllIPolicies :: IPolicy -> Group.List -> String

serializeAllIPolicies cpol gl =

  let groups = Container.elems gl

      allpolicies = [("", cpol)] ++

                    map (\g -> (Group.name g, Group.iPolicy g)) groups

      strings = map (uncurry serializeIPolicy) allpolicies

  in unlines strings

-- | Generate complete cluster data from node and instance lists.

serializeCluster :: ClusterData -> String

serializeCluster (ClusterData gl nl il ctags cpol) =

  let gdata = serializeGroups gl

      ndata = serializeNodes gl nl

      idata = serializeInstances nl il

      pdata = serializeAllIPolicies cpol gl

  -- note: not using 'unlines' as that adds too many newlines

  in intercalate "\n" [gdata, ndata, idata, unlines ctags, pdata]

-- * Parsing functions

-- | Load a group from a field list.

loadGroup :: (Monad m) => [String]

          -> m (String, Group.Group) -- ^ The result, a tuple of group

                                     -- UUID and group object

loadGroup [name, gid, apol] = do

  xapol <- allocPolicyFromRaw apol

  return (gid, Group.create name gid xapol defIPolicy)

loadGroup s = fail $ "Invalid/incomplete group data: '" ++ show s ++ "'"

-- | Load a node from a field list.

loadNode :: (Monad m) =>

            NameAssoc             -- ^ Association list with current groups

         -> [String]              -- ^ Input data as a list of fields

         -> m (String, Node.Node) -- ^ The result, a tuple o node name

                                  -- and node object

loadNode ktg [name, tm, nm, fm, td, fd, tc, fo, gu] = do

  gdx <- lookupGroup ktg name gu

  new_node <-

      if any (== "?") [tm,nm,fm,td,fd,tc] || fo == "Y" then

          return $ Node.create name 0 0 0 0 0 0 True gdx

      else do

        vtm <- tryRead name tm

        vnm <- tryRead name nm

        vfm <- tryRead name fm

        vtd <- tryRead name td

        vfd <- tryRead name fd

        vtc <- tryRead name tc

        return $ Node.create name vtm vnm vfm vtd vfd vtc False gdx

  return (name, new_node)

loadNode _ s = fail $ "Invalid/incomplete node data: '" ++ show s ++ "'"

-- | Load an instance from a field list.

loadInst :: NameAssoc -- ^ Association list with the current nodes

         -> [String]  -- ^ Input data as a list of fields

         -> Result (String, Instance.Instance) -- ^ A tuple of

                                               -- instance name and

                                               -- the instance object

loadInst ktn [ name, mem, dsk, vcpus, status, auto_bal, pnode, snode

             , dt, tags ] = do

  pidx <- lookupNode ktn name pnode

  sidx <- if null snode

            then return Node.noSecondary

            else lookupNode ktn name snode

  vmem <- tryRead name mem

  vdsk <- tryRead name dsk

  vvcpus <- tryRead name vcpus

  vstatus <- instanceStatusFromRaw status

  auto_balance <- case auto_bal of

                    "Y" -> return True

                    "N" -> return False

                    _ -> fail $ "Invalid auto_balance value '" ++ auto_bal ++

                         "' for instance " ++ name

  disk_template <- annotateResult ("Instance " ++ name)

                   (diskTemplateFromRaw dt)

  when (sidx == pidx) $ fail $ "Instance " ++ name ++

           " has same primary and secondary node - " ++ pnode

  let vtags = commaSplit tags

      newinst = Instance.create name vmem vdsk vvcpus vstatus vtags

                auto_balance pidx sidx disk_template

  return (name, newinst)

loadInst _ s = fail $ "Invalid/incomplete instance data: '" ++ show s ++ "'"

-- | Loads a spec from a field list.

loadISpec :: String -> [String] -> Result ISpec

loadISpec owner [mem_s, cpu_c, dsk_s, dsk_c, nic_c] = do

  xmem_s <- tryRead (owner ++ "/memsize") mem_s

  xcpu_c <- tryRead (owner ++ "/cpucount") cpu_c

  xdsk_s <- tryRead (owner ++ "/disksize") dsk_s

  xdsk_c <- tryRead (owner ++ "/diskcount") dsk_c

  xnic_c <- tryRead (owner ++ "/niccount") nic_c

  return $ ISpec xmem_s xcpu_c xdsk_s xdsk_c xnic_c

loadISpec owner s = fail $ "Invalid ispec data for " ++ owner ++ ": " ++ show s

-- | Loads an ipolicy from a field list.

loadIPolicy :: [String] -> Result (String, IPolicy)

loadIPolicy [owner, stdspec, minspec, maxspec, dtemplates, vcpu_ratio] = do

  xstdspec <- loadISpec (owner ++ "/stdspec") (commaSplit stdspec)

  xminspec <- loadISpec (owner ++ "/minspec") (commaSplit minspec)

  xmaxspec <- loadISpec (owner ++ "/maxspec") (commaSplit maxspec)

  xdts <- mapM diskTemplateFromRaw $ commaSplit dtemplates

  xvcpu_ratio <- tryRead (owner ++ "/vcpu_ratio") vcpu_ratio

  return $ (owner, IPolicy xstdspec xminspec xmaxspec xdts xvcpu_ratio)

loadIPolicy s = fail $ "Invalid ipolicy data: '" ++ show s ++ "'"

loadOnePolicy :: (IPolicy, Group.List) -> String

              -> Result (IPolicy, Group.List)

loadOnePolicy (cpol, gl) line = do

  (owner, ipol) <- loadIPolicy (sepSplit '|' line)

  case owner of

    "" -> return (ipol, gl) -- this is a cluster policy (no owner)

    _ -> do

      grp <- Container.findByName gl owner

      let grp' = grp { Group.iPolicy = ipol }

          gl' = Container.add (Group.idx grp') grp' gl

      return (cpol, gl')

-- | Loads all policies from the policy section

loadAllIPolicies :: Group.List -> [String] -> Result (IPolicy, Group.List)

loadAllIPolicies gl =

  foldM loadOnePolicy (defIPolicy, gl)

-- | Convert newline and delimiter-separated text.

--

-- This function converts a text in tabular format as generated by

-- @gnt-instance list@ and @gnt-node list@ to a list of objects using

-- a supplied conversion function.

loadTabular :: (Monad m, Element a) =>

               [String] -- ^ Input data, as a list of lines

            -> ([String] -> m (String, a)) -- ^ Conversion function

            -> m ( NameAssoc

                 , Container.Container a ) -- ^ A tuple of an

                                           -- association list (name

                                           -- to object) and a set as

                                           -- used in

                                           -- "Ganeti.HTools.Container"

loadTabular lines_data convert_fn = do

  let rows = map (sepSplit '|') lines_data

  kerows <- mapM convert_fn rows

  return $ assignIndices kerows

-- | Load the cluser data from disk.

--

-- This is an alias to 'readFile' just for consistency with the other

-- modules.

readData :: String    -- ^ Path to the text file

         -> IO String -- ^ Contents of the file

readData = readFile

-- | Builds the cluster data from text input.

parseData :: String -- ^ Text data

          -> Result ClusterData

parseData fdata = do

  let flines = lines fdata

  (glines, nlines, ilines, ctags, pollines) <-

      case sepSplit "" flines of

        [a, b, c, d, e] -> Ok (a, b, c, d, e)

        [a, b, c, d] -> Ok (a, b, c, d, [])

        xs -> Bad $ printf "Invalid format of the input file: %d sections\

                           \ instead of 4 or 5" (length xs)

  {- group file: name uuid -}

  (ktg, gl) <- loadTabular glines loadGroup

  {- node file: name t_mem n_mem f_mem t_disk f_disk -}

  (ktn, nl) <- loadTabular nlines (loadNode ktg)

  {- instance file: name mem disk status pnode snode -}

  (_, il) <- loadTabular ilines (loadInst ktn)

  {- the tags are simply line-based, no processing needed -}

  {- process policies -}

  (cpol, gl') <- loadAllIPolicies gl pollines

  return (ClusterData gl' nl il ctags cpol)

-- | Top level function for data loading.

loadData :: String -- ^ Path to the text file

         -> IO (Result ClusterData)

loadData = fmap parseData . readData