module Database.RRDtool
- ( DataSource(..)
-
- , Expr
- , CommonExpr
- , IterativeExpr
- , AggregativeExpr
-
- , ExprSet
- , CommonExprSet
-
- , Constant(..)
- , Variable(..)
- , CommonUnaryOp(..)
- , CommonBinaryOp(..)
- , CommonTrinaryOp(..)
- , CommonSetOp(..)
- , TrendOp(..)
- , VariableShiftPredictOp(..)
- , FixedShiftPredictOp(..)
- , CommonValue(..)
- , IterativeValue(..)
- , IterativeValueOf(..)
- , AggregativeUnaryOp(..)
-
- , createRRD
+ ( module Database.RRDtool.Create
)
where
-import Data.HList
-import Data.Time.Clock
-import Data.Time.Clock.POSIX
-
-
--- |A single RRD can accept input from several data sources (DS), for
--- example incoming and outgoing traffic on a specific communication
--- line. With the DS configuration option you must define some basic
--- properties of each data source you want to store in the RRD.
---
--- /NOTE on COUNTER vs DERIVE/
---
--- by Don Baarda <don.baarda@baesystems.com>
---
--- If you cannot tolerate ever mistaking the occasional counter reset
--- for a legitimate counter wrap, and would prefer \"Unknowns\" for
--- all legitimate counter wraps and resets, always use DERIVE with
--- @'dsMin' = 0@. Otherwise, using COUNTER with a suitable max will
--- return correct values for all legitimate counter wraps, mark some
--- counter resets as \"Unknown\", but can mistake some counter resets
--- for a legitimate counter wrap.
---
--- For a 5 minute step and 32-bit counter, the probability of
--- mistaking a counter reset for a legitimate wrap is arguably about
--- 0.8% per 1Mbps of maximum bandwidth. Note that this equates to 80%
--- for 100Mbps interfaces, so for high bandwidth interfaces and a
--- 32bit counter, DERIVE with @'dsMin' = 0@ is probably preferable. If
--- you are using a 64bit counter, just about any max setting will
--- eliminate the possibility of mistaking a reset for a counter wrap.
-data DataSource
- = -- |GAUGE is for things like temperatures or number of people in
- -- a room or the value of a RedHat share.
- GAUGE {
- -- |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_]@.
- dsName :: !String
- -- |Defines the maximum number of seconds that may
- -- pass between two updates of this data source before the
- -- value of the data source is assumed to be @*UNKNOWN*@.
- , dsHeartbeat :: !NominalDiffTime
- -- |'dsMin' and 'dsMax' Define the expected range values for
- -- data supplied by a data source. If 'dsMin' and\/or 'dsMax'
- -- any value outside the defined range will be regarded as
- -- @*UNKNOWN*@. If you do not know or care about 'dsMin' and
- -- 'dsMax', set them to 'Nothing' for unknown. Note that
- -- 'dsMin' and 'dsMax' always refer to the processed values of
- -- the DS. For a traffic-'COUNTER' type DS this would be the
- -- maximum and minimum data-rate expected from the device.
- --
- -- If information on minimal\/maximal expected values is
- -- available, always set the min and\/or max properties. This
- -- will help RRDtool in doing a simple sanity check on the
- -- data supplied when running update.
- , dsMin :: !(Maybe Double)
- -- |See 'dsMin'.
- , dsMax :: !(Maybe Double)
- }
- -- |COUNTER is for continuous incrementing counters like the
- -- ifInOctets counter in a router. The COUNTER data source assumes
- -- that the counter never decreases, except when a counter
- -- overflows. The update function takes the overflow into
- -- account. The counter is stored as a per-second rate. When the
- -- counter overflows, RRDtool checks if the overflow happened at
- -- the 32bit or 64bit border and acts accordingly by adding an
- -- appropriate value to the result.
- | COUNTER {
- dsName :: !String
- , dsHeartbeat :: !NominalDiffTime
- , dsMin :: !(Maybe Double)
- , dsMax :: !(Maybe Double)
- }
- -- |DERIVE will store the derivative of the line going from the
- -- last to the current value of the data source. This can be
- -- useful for gauges, for example, to measure the rate of people
- -- entering or leaving a room. Internally, derive works exactly
- -- like COUNTER but without overflow checks. So if your counter
- -- does not reset at 32 or 64 bit you might want to use DERIVE and
- -- combine it with a 'dsMin' value of 0.
- | DERIVE {
- dsName :: !String
- , dsHeartbeat :: !NominalDiffTime
- , dsMin :: !(Maybe Double)
- , dsMax :: !(Maybe Double)
- }
- -- |ABSOLUTE is for counters which get reset upon reading. This is
- -- used for fast counters which tend to overflow. So instead of
- -- reading them normally you reset them after every read to make
- -- sure you have a maximum time available before the next
- -- overflow. Another usage is for things you count like number of
- -- messages since the last update.
- | ABSOLUTE {
- dsName :: !String
- , dsHeartbeat :: !NominalDiffTime
- , dsMin :: !(Maybe Double)
- , dsMax :: !(Maybe Double)
- }
- -- |COMPUTE is for storing the result of a formula applied to
- -- other data sources in the RRD. This data source is not supplied
- -- a value on update, but rather its Primary Data Points (PDPs)
- -- are computed from the PDPs of the data sources according to the
- -- rpn-expression that defines the formula. Consolidation
- -- functions are then applied normally to the PDPs of the COMPUTE
- -- data source (that is the rpn-expression is only applied to
- -- generate PDPs). In database software, such data sets are
- -- referred to as \"virtual\" or \"computed\" columns.
- --
- -- FIXME: doc links
- | forall a. CommonExpr a => COMPUTE {
- dsName :: !String
- -- |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
- -- for the graph command. For COMPUTE data sources, the
- -- following RPN operations are not supported: COUNT, PREV,
- -- TIME, and LTIME. In addition, in defining the RPN
- -- expression, the COMPUTE data source may only refer to the
- -- names of data source listed previously in the create
- -- command. This is similar to the restriction that CDEFs must
- -- refer only to DEFs and CDEFs previously defined in the same
- -- graph command.
- --
- -- FIXME: doc links
- , dsExpr :: !a
- }
-
-dsTest :: DataSource
-dsTest = COMPUTE {
- dsName = "foo"
--- , dsExpr = Previous :<: Const 100
--- , dsExpr = Var "foo" :<: Const 100
- , dsExpr = AverageOf (Const 100 .*. Const 200 .*. HNil)
- }
-
-class (Show e, Eq e) => Expr e
-class Expr e => CommonExpr e
-class Expr e => IterativeExpr e
-class Expr e => AggregativeExpr e
-instance CommonExpr e => IterativeExpr e
-
---class MentionedVars
-
-class (Show es, Eq es, HList es) => ExprSet es
-instance ExprSet HNil
-instance (Expr e, ExprSet es) => ExprSet (HCons e es)
-
-class (Show es, Eq es, HList es) => CommonExprSet es
-instance CommonExprSet es => ExprSet es
-instance CommonExprSet HNil
-instance (CommonExpr e, CommonExprSet es) => CommonExprSet (HCons e es)
-
-
--- Constants and variable names
-data Constant
- = Const !Double
- deriving (Show, Eq, Ord)
-instance Expr Constant
-instance CommonExpr Constant
-
-class (Show a, Eq a) => Variable a where
- varName :: a -> String
-
-instance Variable a => Expr a
-instance Variable a => CommonExpr a
-
--- Common operators
-data CommonUnaryOp a
- = IsUnknown !a
- | IsInfinity !a
- | Sin !a
- | Cos !a
- | Log !a
- | Exp !a
- | Sqrt !a
- | Atan !a
- | Floor !a
- | Ceil !a
- | Deg2Rad !a
- | Rad2Deg !a
- | Abs !a
- deriving (Show, Eq, Ord)
-instance Expr a => Expr (CommonUnaryOp a)
-instance CommonExpr a => CommonExpr (CommonUnaryOp a)
-
-data CommonBinaryOp a b
- = !a :<: !b
- | !a :<=: !b
- | !a :>: !b
- | !a :>=: !b
- | !a :==: !b
- | !a :/=: !b
- | Min !a !b
- | Max !a !b
- | !a :+: !b
- | !a :-: !b
- | !a :*: !b
- | !a :/: !b
- | !a :%: !b
- | AddNaN !a !b
- | AtanXY !a !b
- deriving (Show, Eq, Ord)
-instance (Expr a, Expr b)
- => Expr (CommonBinaryOp a b)
-instance (CommonExpr a, CommonExpr b)
- => CommonExpr (CommonBinaryOp a b)
-
-data CommonTrinaryOp a b c
- = If !a !b !c
- | Limit !a !b !c
- deriving (Show, Eq, Ord)
-instance (Expr a, Expr b, Expr c)
- => Expr (CommonTrinaryOp a b c)
-instance (CommonExpr a, CommonExpr b, CommonExpr c)
- => CommonExpr (CommonTrinaryOp a b c)
-
--- SORT and REV can't be expressed in this way as they pushes possibly
--- multiple values onto the stack...
-
-data CommonSetOp es
- = AverageOf !es
- deriving (Show, Eq, Ord)
-instance ExprSet es => Expr (CommonSetOp es)
-instance CommonExprSet es => CommonExpr (CommonSetOp es)
-
-data TrendOp v a
- = Trend !v !a
- | TrendNan !v !a
- deriving (Show, Eq, Ord)
-instance (Variable v, Expr a) => Expr (TrendOp v a)
-instance (Variable v, CommonExpr a) => CommonExpr (TrendOp v a)
-
-data VariableShiftPredictOp ss w v
- = VariableShiftPredictAverage !ss !w !v
- | VariableShiftPredictSigma !ss !w !v
- deriving (Show, Eq, Ord)
-instance (ExprSet ss, Expr w, Variable v)
- => Expr (VariableShiftPredictOp ss w v)
-instance (CommonExprSet ss, CommonExpr w, Variable v)
- => CommonExpr (VariableShiftPredictOp ss w v)
-
-data FixedShiftPredictOp sm w v
- = FixedShiftPredictAverage !sm !w !v
- | FixedShiftPredictSigma !sm !w !v
- deriving (Show, Eq, Ord)
-instance (Expr sm, Expr w, Variable v)
- => Expr (FixedShiftPredictOp sm w v)
-instance (CommonExpr sm, CommonExpr w, Variable v)
- => CommonExpr (FixedShiftPredictOp sm w v)
-
--- Common special values
-data CommonValue
- = Unknown
- | Infinity
- | NegativeInfinity
- | Now
- deriving (Show, Eq, Ord)
-instance Expr CommonValue
-instance CommonExpr CommonValue
-
--- Iterative special values
-data IterativeValue
- = Previous
- | Count
- | TakenTime
- | TakenLocalTime
- deriving (Show, Eq, Ord)
-instance Expr IterativeValue
-instance IterativeExpr IterativeValue
-
-data IterativeValueOf v
- = PreviousOf !v
- deriving (Show, Eq, Ord)
-instance Variable v => Expr (IterativeValueOf v)
-instance Variable v => IterativeExpr (IterativeValueOf v)
-
--- Aggregative operators (fairly restricted due to rrdtool's
--- restriction)
-data AggregativeUnaryOp v
- = Maximum !v
- | Minimum !v
- | Average !v
- | StandardDeviation !v
- | First !v
- | Last !v
- | Total !v
- | Percent !v !Constant
- | PercentNan !v !Constant
- | LSLSlope !v
- | LSLInt !v
- | LSLCorrel !v
- deriving (Show, Eq, Ord)
-instance Variable v => Expr (AggregativeUnaryOp v)
-instance Variable v => AggregativeExpr (AggregativeUnaryOp v)
-
--- |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 = error "FIXME"
\ No newline at end of file
+import Database.RRDtool.Create
projects / hs-rrdtool.git / blobdiff