PostHog OpenFeature Provider for Go

This repository provides an implementation of an OpenFeature provider for PostHog.

Getting started

This simple snippet should be enough to get you started to use the provider:

import (
	"fmt"
	"context"

	"github.com/dhaus67/openfeature-posthog-go"
	"github.com/open-feature/go-sdk/openfeature"
	"github.com/posthog/posthog-go"
)

func main() {
	// Start by creating a PostHog client with your desired configuration.
	client, err := posthog.NewWithConifg("<your api key>", posthog.Config{})
	if err != nil {
		panic(err)
	}

	// Create the provider and register it.
	openfeature.SetProvider(openfeatureposthog.NewProvider(client))

	client := openfeature.NewClient("my-client")

	// The targeting key is required with this provider. It is used to evaluate with PostHog
	// whether for the specific user the feature is enabled or not.
	evalCtx := openfeature.NewEvaluationContext("<distinct-user-id>", map[string]interface{}{})

	secretFeature, err := client.BooleanValue(context.Background(), "secret", false, evalCtx)
	if err != nil {
		panic(err)
	}

	if secretFeature {
		fmt.Println("Secret feature is enabled")
	}
}

In addition to the targeting key, it is also possible to specify additional values to filter on for the PostHog user: groups, groupProperties, and personProperties.

The documentation for the PostHog Go SDK has a rich documentation about these use-cases.