Safe Haskell	None
Language	Haskell2010

System.Metrics.Json

Contents

Converting metrics to JSON values
- Newtype wrappers with instances

Description

Encoding of ekg metrics as JSON. The encoding defined by the functions in this module are standardized and used by the ekg web UI. The purpose of this module is to let other web servers and frameworks than the one used by the ekg package expose ekg metrics.

Synopsis

Converting metrics to JSON values

sampleToJson :: Sample -> Value #

Encode metrics as nested JSON objects. Each "." in the metric name introduces a new level of nesting. For example, the metrics [("foo.bar", 10), ("foo.baz", "label")] are encoded as

{
  "foo": {
    "bar": {
      "type:", "c",
      "val": 10
    },
    "baz": {
      "type": "l",
      "val": "label"
    }
  }
}

valueToJson :: Value -> Value #

Encodes a single metric as a JSON object. Example:

{
  "type": "c",
  "val": 89460
}

Newtype wrappers with instances

newtype Sample #

Newtype wrapper that provides a ToJSON instances for the underlying Sample without creating an orphan instance.

Constructors

Sample Sample

Instances

Show Sample #
Instance details Defined in System.Metrics.Json Methods showsPrec :: Int -> Sample -> ShowS # show :: Sample -> String # showList :: [Sample] -> ShowS #
ToJSON Sample #	Uses `sampleToJson`.
Instance details Defined in System.Metrics.Json Methods toJSON :: Sample -> Value # toEncoding :: Sample -> Encoding # toJSONList :: [Sample] -> Value # toEncodingList :: [Sample] -> Encoding #

newtype Value #

Newtype wrapper that provides a ToJSON instances for the underlying Value without creating an orphan instance.

Constructors

Value Value

Instances

Show Value #
Instance details Defined in System.Metrics.Json Methods showsPrec :: Int -> Value -> ShowS # show :: Value -> String # showList :: [Value] -> ShowS #
ToJSON Value #	Uses `valueToJson`.
Instance details Defined in System.Metrics.Json Methods toJSON :: Value -> Value0 # toEncoding :: Value -> Encoding # toJSONList :: [Value] -> Value0 # toEncodingList :: [Value] -> Encoding #