146 lines
6.5 KiB
Haskell
146 lines
6.5 KiB
Haskell
module Ringo where
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import Ringo.Types
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import qualified Data.Map as Map
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import qualified Data.Text as T
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import Data.Maybe (mapMaybe, fromMaybe, fromJust)
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import Data.Monoid ((<>))
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import Data.List (nub, find)
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data ValidationError = MissingTable TableName
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| MissingFact TableName
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| MissingColumn TableName ColumnName
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deriving (Eq, Show)
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findTable :: TableName -> [Table] -> Maybe Table
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findTable tName = find ((== tName) . tableName)
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findFact :: TableName -> [Fact] -> Maybe Fact
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findFact fName = find ((== fName) . factName)
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findColumn :: ColumnName -> [Column] -> Maybe Column
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findColumn cName = find ((== cName) . columnName)
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checkTableForCol :: Table -> ColumnName -> [ValidationError]
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checkTableForCol tab colName =
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[ MissingColumn (tableName tab) colName |
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not . any ((colName ==) . columnName) . tableColumns $ tab ]
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validateTable :: [Table] -> Table -> [ValidationError]
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validateTable tables table = concatMap checkConstraint . tableConstraints $ table
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where
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checkConstraint (PrimaryKey colName) = checkTableForCol table colName
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checkConstraint (UniqueKey columnNames) = checkTableForColRefs table columnNames
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checkConstraint (ForeignKey oTableName columnNames) =
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case findTable oTableName tables of
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Just oTable ->
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checkTableForColRefs table (map fst columnNames)
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++ checkTableForColRefs oTable (map snd columnNames)
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Nothing -> [MissingTable oTableName]
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checkTableForColRefs tab = concatMap (checkTableForCol tab)
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validateFact :: [Table] -> [Fact] -> Fact -> [ValidationError]
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validateFact tables facts Fact {..} =
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case findTable factTableName tables of
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Nothing -> [MissingTable factTableName]
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Just table -> validateTable tables table
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++ concatMap checkFactParents factParentNames
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++ concatMap (checkColumn table) factColumns
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where
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checkFactParents fName = case findFact fName facts of
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Nothing -> [MissingFact fName]
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Just pFact -> validateFact tables facts pFact
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checkColumn table = maybe [] (checkTableForCol table) . factColumnName
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withFactValidation :: [Table] -> [Fact] -> Fact -> (Table -> a) -> Either [ValidationError] a
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withFactValidation tables facts fact func =
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let errors = validateFact tables facts fact
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in if not $ null errors
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then Left errors
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else Right . func . fromJust $ findTable (factTableName fact) tables
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extractDimensions' :: [Table] -> T.Text -> Fact -> Table -> [Table]
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extractDimensions' tables prefix fact Table {..} = dimsFromIds ++ dimsFromVals
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where
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dimsFromIds =
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mapMaybe (\fcol -> case fcol of
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DimId d _ -> findTable d tables
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_ -> Nothing)
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. factColumns
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$ fact
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dimsFromVals =
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map (\(dim, cols) -> Table { tableName = prefix <> dim
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, tableColumns = Column "id" "serial" NotNull : cols
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, tableConstraints = [ PrimaryKey "id"
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, UniqueKey (map columnName cols)
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]
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})
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. Map.toList
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. Map.mapWithKey (\dim -> map (cleanColumn dim) . nub)
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. Map.fromListWith (flip (++))
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. mapMaybe (\fcol -> do
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DimVal d col <- fcol
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column <- findColumn col tableColumns
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return (d, [column]))
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. map Just
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. factColumns
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$ fact
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cleanColumn dim col@Column {..} =
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col { columnName = fromMaybe columnName . T.stripPrefix (T.snoc dim '_') $ columnName }
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extractDimensions :: [Table] -> [Fact] -> T.Text -> Fact -> Either [ValidationError] [Table]
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extractDimensions tables facts prefix fact =
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withFactValidation tables facts fact $ extractDimensions' tables prefix fact
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extractAllDimensions' :: [Table] -> [Fact] -> T.Text -> Fact -> Table -> [Table]
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extractAllDimensions' tables facts dimPrefix fact table = nub go
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where
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go = extractDimensions' tables dimPrefix fact table ++
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if null $ factParentNames fact
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then []
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else concatMap extract . factParentNames $ fact
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extract fName =
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let pFact = fromJust . findFact fName $ facts
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pFactTable = fromJust . findTable (factTableName pFact) $ tables
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in extractAllDimensions' tables facts dimPrefix pFact pFactTable
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extractFactTable :: [Table] -> [Fact] -> Settings -> Fact -> Either [ValidationError] Table
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extractFactTable tables facts Settings {..} fact =
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withFactValidation tables facts fact $ \table@Table{..} ->
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let allDims = extractAllDimensions' tables facts settingDimPrefix fact table
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sourceColumnType colName = columnType . fromJust $ findColumn colName tableColumns
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columns = flip concatMap (factColumns fact) $ \col -> case col of
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DimTime cName -> [ Column (timeUnitColName cName) "integer" NotNull ]
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NoDimId cName -> [ fromJust . findColumn cName $ tableColumns ]
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FactCount cName -> [ Column cName "integer" NotNull ]
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FactSum scName cName -> [ Column cName (sourceColumnType scName) NotNull ]
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FactAverage scName cName -> [ Column (cName <> "_count") "integer" NotNull
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, Column (cName <> "_sum") (sourceColumnType scName) NotNull
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, Column cName "double" NotNull
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]
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FactCountDistinct cName -> [ Column cName ("integer[]") NotNull ]
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_ -> []
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fks = flip map allDims $ \Table { tableName = tName, tableColumns = tCols } ->
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let colName = fromMaybe tName (T.stripPrefix settingDimPrefix tName) <> "_id"
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colNullable = if any ((== Null) . columnNullable) tCols then Null else NotNull
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in (Column colName "integer" colNullable, ForeignKey tName [(colName, "id")])
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ukColNames = mapMaybe (\col -> case col of
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DimTime cName -> Just (timeUnitColName cName)
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NoDimId cName -> Just cName
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_ -> Nothing) (factColumns fact)
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++ map (columnName . fst) fks
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in Table { tableName = settingFactPrefix <> factName fact
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, tableColumns = columns ++ map fst fks
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, tableConstraints = UniqueKey ukColNames : map snd fks
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}
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where
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timeUnitColName colName = colName <> "_" <> timeUnitName settingTimeUnit <> "_id"
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