Extend OpenFeature service (#106707)

pkg/setting/setting_openfeature.go

@@ -0,0 +1,51 @@
+package setting
+
+import (
+	"fmt"
+	"net/url"
+)
+
+const (
+	StaticProviderType = "static"
+	GOFFProviderType   = "goff"
+)
+
+type OpenFeatureSettings struct {
+	ProviderType string
+	URL          *url.URL
+	TargetingKey string
+	ContextAttrs map[string]any
+}
+
+func (cfg *Cfg) readOpenFeatureSettings() error {
+	cfg.OpenFeature = OpenFeatureSettings{}
+
+	config := cfg.Raw.Section("feature_toggles.openfeature")
+	cfg.OpenFeature.ProviderType = config.Key("provider").MustString(StaticProviderType)
+	cfg.OpenFeature.TargetingKey = config.Key("targetingKey").MustString(cfg.AppURL)
+
+	strURL := config.Key("url").MustString("")
+
+	if strURL != "" && cfg.OpenFeature.ProviderType == GOFFProviderType {
+		u, err := url.Parse(strURL)
+		if err != nil {
+			return fmt.Errorf("invalid feature provider url: %w", err)
+		}
+		cfg.OpenFeature.URL = u
+	}
+
+	// build the eval context attributes using [feature_toggles.openfeature.context] section
+	ctxConf := cfg.Raw.Section("feature_toggles.openfeature.context")
+	attrs := map[string]any{}
+	for _, key := range ctxConf.KeyStrings() {
+		attrs[key] = ctxConf.Key(key).String()
+	}
+
+	// Some default attributes
+	if _, ok := attrs["grafana_version"]; !ok {
+		attrs["grafana_version"] = BuildVersion
+	}
+
+	cfg.OpenFeature.ContextAttrs = attrs
+	return nil
+}