gen

Documentation

Index

• Constants
• func CsvInput(ctx context.Context, schema Schema) (string, error)
• func Input(ctx context.Context, schema Schema) (flux.TableIterator, error)
• type Schema
• type Tag

Constants

const (
	// DefaultNumPoints is the default number of points that should
	// be generated for each series.
	DefaultNumPoints = 6

	// DefaultPeriod is the default period between points in a series.
	DefaultPeriod = 10 * time.Second
)

Functions

func CsvInput

func CsvInput(ctx context.Context, schema Schema) (string, error)

CsvInput generates a csv input based on the Schema.

func Input

func Input(ctx context.Context, schema Schema) (flux.TableIterator, error)

Input constructs a TableIterator with randomly generated data according to the Schema.

Types

type Schema

type Schema struct {
	// Start is the start time for generating data. This will default
	// so the current time would be the last point generated, but
	// truncated to the period.
	Start time.Time

	// Tags is a listing of tags and the generated cardinality for
	// that tag.
	Tags []Tag

	// NumPoints is the number of points that should be generated
	// for each series. This defaults to 6.
	NumPoints int

	// Nulls sets the percentage changes that a null value will
	// be used in the input. This should be a number between 0 and 1.
	Nulls float64

	// Period contains the distance between each point in a series.
	// This defaults to 10 seconds.
	Period time.Duration

	// GroupBy is a list of tags that, if they have the same value,
	// will have the same type even if the types ratio becomes
	// impossible to fulfill. This only does something if Types
	// has been set.
	GroupBy []string

	// Types includes a mapping of the column value type
	// to the ratio for how frequently it should show up
	// in the output. If this is left blank, all series
	// will be generated with a float value.
	Types map[flux.ColType]int

	// Seed is the (optional) seed to be used by the random
	// number generator. If this is null, the current time
	// will be used.
	Seed *int64

	// Alloc assigns an allocator to use when generating the
	// tables. If this is not set, an unlimited allocator is
	// used.
	Alloc *memory.Allocator
}

Schema describes the schema to be generated.

type Tag

type Tag struct {
	Name        string
	Cardinality int
}

Tag includes the tag name and the cardinality for that tag in the schema.