+{-# LANGUAGE
+ FlexibleContexts,
+ FlexibleInstances,
+ GADTs,
+ OverlappingInstances,
+ TypeFamilies,
+ UndecidableInstances
+ #-}
+{-# LANGUAGE QuasiQuotes #-} -- DELETE THIS
module Database.RRDtool.Create
( DataSource
, ExternalDSType(..)
, createRRD
-- Data.HList
- , (.*.)
+ , (.&.)
, HNil(..)
-- Database.RRDtool.Expression
, Constant(..)
- , IsVarName(..)
+ , IsVarName
, Variable(..)
, CommonUnaryOp(..)
, CommonBinaryOp(..)
import Data.Time.Clock
import Data.Time.Clock.POSIX
import Database.RRDtool.Expression
+import Types.Data.Bool
-- |A single RRD can accept input from several data sources (DS), for
-- number of messages since the last update.
deriving (Show, Eq, Ord)
-instance DataSource ExternalDSType
-
-data ExternalDataSource
+data ExternalDataSource vn
= ExternalDataSource {
-- |The name you will use to reference this particular data
-- source from an RRD. A ds name must be 1 to 19 characters
-- long in the characters @[a-zA-Z0-9_]@.
- edsName :: !String
+ edsName :: !vn
-- |The type of this data source.
, edsType :: !ExternalDSType
-- |Defines the maximum number of seconds that may pass
}
deriving (Show, Eq, Ord)
+instance ( IsVarName vn ~ True
+ )
+ => DataSource (ExternalDataSource vn)
+
-- |ComputedDataSource is for storing the result of a formula applied
-- to other data sources in the RRD. This data source is not supplied
-- \"computed\" columns.
--
-- FIXME: doc links
-data ComputedDataSource e
+data ComputedDataSource vn e
= ComputedDataSource {
-- |See 'edsName'
- cdsName :: !String
+ cdsName :: !vn
-- |rpn-expression defines the formula used to compute the
-- PDPs of a COMPUTE data source from other data sources in
-- the same \<RRD\>. It is similar to defining a CDEF argument
}
deriving (Show, Eq, Ord)
-instance IsCommonExpr e => DataSource (ComputedDataSource e)
-
+instance ( IsVarName vn ~ True
+ , IsCommonExpr e ~ True
+ )
+ => DataSource (ComputedDataSource vn e)
+{-
dsTest = ComputedDataSource {
cdsName = "foo"
--- , dsExpr = Previous :<: Const 100
--- , dsExpr = Var "foo" :<: Const 100
+-- , cdsExpr = Previous :<: Const 100
+-- , cdsExpr = Var "foo" :<: Const 100
, cdsExpr = AverageOf (Const 100 .*. Const 200 .*. HNil)
}
+-}
+
+-- |The name of the RRD you want to create. RRD files should end with
+-- the extension @.rrd@. However, RRDtool will accept any filename.
+newtype RRDPath = RRDPath FilePath
+
+-- |Do not clobber an existing file of the same name.
+data KeepOldRRD = KeepOldRRD
+
+-- |Specifies the time in seconds since @1970-01-01 UTC@ when the
+-- first value should be added to the RRD. RRDtool will not accept any
+-- data timed before or at the time specified. (default: @now - 10s@)
+newtype RRDStartTime = RRDStartTime POSIXTime
+
+-- |Specifies the base interval in seconds with which data will be fed
+-- into the RRD. (default: 300 sec)
+newtype RRDInterval = RRDInterval NominalDiffTime
+
+class RRDSpec s
+instance ( HOccurs RRDPath s
+ , HOccursOpt KeepOldRRD s
+ , HOccursOpt RRDStartTime s
+ , HOccursOpt RRDInterval s
+ )
+ => RRDSpec s
+
+class NonEmptyDSList l
+instance ( DSList l
+ , DataSource ds
+ )
+ => NonEmptyDSList (HCons ds l)
+
+class DSList l
+instance DSList HNil
+instance ( DSList l
+ , DataSource ds
+ )
+ => DSList (HCons ds l)
+
+-- DataList would be a graph...
-- |The 'createRRD' function lets you set up new Round Robin Database
-- (RRD) files. The file is created at its final, full size and filled
-- with @*UNKNOWN*@ data.
-createRRD
- :: FilePath -- ^The name of the RRD you want to create. RRD files
- -- should end with the extension @.rrd@. However,
- -- RRDtool will accept any filename.
- -> Bool -- ^Do not clobber an existing file of the same name.
- -> Maybe POSIXTime -- ^Specifies the time in seconds since
- -- @1970-01-01 UTC@ when the first value should
- -- be added to the RRD. RRDtool will not accept
- -- any data timed before or at the time
- -- specified. (default: @now - 10s@)
- -> Maybe NominalDiffTime -- ^Specifies the base interval in
- -- seconds with which data will be fed
- -- into the RRD. (default: 300 sec)
--- -> [DataSource] -- ^Data sources to accept input from.
- -> IO ()
+createRRD :: ( RRDSpec s
+ , NonEmptyDSList l
+ )
+ => s -> l -> IO ()
createRRD = error "FIXME"
+
+testMain :: IO ()
+testMain = let s = RRDPath "test.rrd" .&.
+ KeepOldRRD .&.
+ HNil
+ x = ComputedDataSource {
+ cdsName = [$hString|foo|]
+ , cdsExpr = Const 100
+ }
+ d = x .&. HNil
+ in
+ createRRD s d