exporter

Documentation

Overview

Package exporter defines the data exporter of go-feature-flag

These exporters are usable in your init configuration.

ffclient.Init(ffclient.Config{
  //...
  DataExporter: ffclient.DataExporter{
   FlushInterval:   10 * time.Second,
   MaxEventInMemory: 1000,
   Exporter: &fileexporter.Exporter{
     OutputDir: "/output-data/",
   },
 },
 //...
})

Index

• Constants
• func ComputeFilename(template *template.Template, format string) (string, error)
• func FormatEventInCSV(csvTemplate *template.Template, event FeatureEvent) ([]byte, error)
• func FormatEventInJSON(event FeatureEvent) ([]byte, error)
• func ParseTemplate(name string, templateToParse string, defaultTemplate string) *template.Template
• type Exporter
• type FeatureEvent
  • func NewFeatureEvent(ctx ffcontext.Context, flagKey string, value interface{}, variation string, ...) FeatureEvent
  • func (f *FeatureEvent) MarshalInterface() error
• type Scheduler
  • func NewScheduler(ctx context.Context, flushInterval time.Duration, maxEventInMemory int64, ...) *Scheduler
  • func (dc *Scheduler) AddEvent(event FeatureEvent)
  • func (dc *Scheduler) Close()
  • func (dc *Scheduler) StartDaemon()

Constants

const DefaultCsvTemplate = "{{ .Kind}};{{ .ContextKind}};{{ .UserKey}};{{ .CreationDate}};{{ .Key}};{{ .Variation}};" +
	"{{ .Value}};{{ .Default}}\n"

const DefaultFilenameTemplate = "flag-variation-{{ .Hostname}}-{{ .Timestamp}}.{{ .Format}}"

Functions

func ComputeFilename

func ComputeFilename(template *template.Template, format string) (string, error)

ComputeFilename is computing the filename to use for the export file

func FormatEventInCSV

func FormatEventInCSV(csvTemplate *template.Template, event FeatureEvent) ([]byte, error)

func FormatEventInJSON

func FormatEventInJSON(event FeatureEvent) ([]byte, error)

func ParseTemplate

func ParseTemplate(name string, templateToParse string, defaultTemplate string) *template.Template

ParseTemplate is parsing the template given by the config or use the default template

Types

type Exporter

type Exporter interface {
	// Export will send the data to the exporter.
	Export(context.Context, *log.Logger, []FeatureEvent) error

	// IsBulk return false if we should directly send the data as soon as it is produce
	// and true if we collect the data to send them in bulk.
	IsBulk() bool
}

Exporter is an interface to describe how a exporter looks like.

type FeatureEvent

type FeatureEvent struct {
	// Kind for a feature event is feature.
	// A feature event will only be generated if the trackEvents attribute of the flag is set to true.
	Kind string `json:"kind" example:"feature" parquet:"name=kind, type=BYTE_ARRAY, convertedtype=UTF8"`

	// ContextKind is the kind of context which generated an event. This will only be "anonymousUser" for events generated
	// on behalf of an anonymous user or the reserved word "user" for events generated on behalf of a non-anonymous user
	ContextKind string `json:"contextKind,omitempty" example:"user" parquet:"name=contextKind, type=BYTE_ARRAY, convertedtype=UTF8"`

	// UserKey The key of the user object used in a feature flag evaluation. Details for the user object used in a feature
	// flag evaluation as reported by the "feature" event are transmitted periodically with a separate index event.
	UserKey string `json:"userKey" example:"94a25909-20d8-40cc-8500-fee99b569345" parquet:"name=userKey, type=BYTE_ARRAY, convertedtype=UTF8"`

	// CreationDate When the feature flag was requested at Unix epoch time in milliseconds.
	CreationDate int64 `json:"creationDate" example:"1680246000011" parquet:"name=creationDate, type=INT64"`

	// Key of the feature flag requested.
	Key string `json:"key" example:"my-feature-flag" parquet:"name=key, type=BYTE_ARRAY, convertedtype=UTF8"`

	// Variation  of the flag requested. Flag variation values can be "True", "False", "Default" or "SdkDefault"
	// depending on which value was taken during flag evaluation. "SdkDefault" is used when an error is detected and the
	// default value passed during the call to your variation is used.
	Variation string `json:"variation" example:"admin-variation" parquet:"name=variation, type=BYTE_ARRAY, convertedtype=UTF8"`

	// Value of the feature flag returned by feature flag evaluation.
	Value interface{} `json:"value" parquet:"name=value, type=BYTE_ARRAY, convertedtype=UTF8"`

	// Default value is set to true if feature flag evaluation failed, in which case the value returned was the default
	// value passed to variation. If the default field is omitted, it is assumed to be false.
	Default bool `json:"default" example:"false" parquet:"name=default, type=BOOLEAN"`

	// Version contains the version of the flag. If the field is omitted for the flag in the configuration file
	// the default version will be 0.
	Version string `json:"version" example:"v1.0.0" parquet:"name=version, type=BYTE_ARRAY, convertedtype=UTF8"`
}

FeatureEvent represent an event that we store in the data storage nolint:lll

func NewFeatureEvent

func NewFeatureEvent(
	ctx ffcontext.Context,
	flagKey string,
	value interface{},
	variation string,
	failed bool,
	version string,
) FeatureEvent

func (*FeatureEvent) MarshalInterface

func (f *FeatureEvent) MarshalInterface() error

MarshalInterface marshals all interface type fields in FeatureEvent into JSON-encoded string.

type Scheduler

type Scheduler struct {
	// contains filtered or unexported fields
}

Scheduler is the struct that handle the data collection.

func NewScheduler

func NewScheduler(ctx context.Context, flushInterval time.Duration, maxEventInMemory int64,
	exp Exporter, logger *log.Logger,
) *Scheduler

NewScheduler allows to create a new instance of Scheduler ready to be used to export data.

func (*Scheduler) AddEvent

func (dc *Scheduler) AddEvent(event FeatureEvent)

AddEvent allow to add an event to the local cache and to call the exporter if we reach the maximum number of events that can be present in the cache.

func (*Scheduler) Close

func (dc *Scheduler) Close()

Close will stop the daemon and send the data still in the cache

func (*Scheduler) StartDaemon

func (dc *Scheduler) StartDaemon()

StartDaemon will start a goroutine to check every X seconds if we should send the data. The daemon is started only if we have a bulk exporter.