Database.InfluxDB.JSON

Result parsers

parseResultsWith

Arguments

:: (Maybe Text -> HashMap Text Text -> Vector Text -> Array -> Parser a)

A parser that takes

1. an optional name of the series
2. a map of tags
3. an array of field names
4. an array of values

to construct a value.

-> Value

-> Parser (Vector a)

Parse a JSON response with the lenientDecoder. This can be useful to implement the parseResults method.

parseResultsWithDecoder

Arguments

:: Decoder a

-> (Maybe Text -> HashMap Text Text -> Vector Text -> Array -> Parser a)

A parser that takes

1. an optional name of the series
2. a map of tags
3. an array of field names
4. an array of values

to construct a value.

-> Value

-> Parser (Vector a)

Parse a JSON response with the specified decoder settings.

Decoder settings

data Decoder a

Decoder settings

Constructors

Decoder

Fields

• decodeEach :: Parser a -> Parser b

  How to decode each row. For example optional can be used to turn parse failrues into Nothings.

• decodeFold :: Parser (Vector b) -> Parser (Vector a)

  How to aggregate rows into the resulting vector.

strictDecoder :: Decoder a

A decoder that fails immediately if there's any parse failure.

lenientDecoder :: Decoder a

A decoder that ignores parse failures and returns only successful results.

Getting fields and tags

getField

Arguments

:: Monad m

=> Text

Column name

-> Vector Text

Columns

-> Vector Value

Field values

-> m Value

Get a field value from a column name

getTag

Arguments

:: Monad m

=> Text

Tag name

-> HashMap Text Value

Tags

-> m Value

Get a tag value from a tag name

Common JSON object parsers

parseJSON :: FromJSON a => Value -> Parser a

parseUTCTime :: Precision ty -> Value -> Parser UTCTime

Parse either a POSIX timestamp or RFC3339 formatted timestamp as UTCTime.

parsePOSIXTime :: Precision ty -> Value -> Parser POSIXTime

Parse either a POSIX timestamp or RFC3339 formatted timestamp as POSIXTime.

parseRFC3339 :: ParseTime time => Value -> Parser time

Parse a RFC3339-formatted timestamp.

Note that this parser is slow as it converts a Text input to a String before parsing.

parseQueryField :: Value -> Parser QueryField

Deprecated: This function parses numbers in a misleading way. Use parseJSON instead.

Parse a QueryField.

Utility functions

parseResultsObject :: Value -> Parser (Vector Value)

Parse a result response.

parseSeriesObject :: Value -> Parser (Vector Value)

Parse a series response.

parseSeriesBody :: Value -> Parser (Maybe Text, HashMap Text Text, Vector Text, Array)

Parse the common JSON structure used in query responses.

parseErrorObject :: Value -> Parser a

Parse the common JSON structure used in failure response.