Curtailment devices: new device class for feed-in limitation (BC) (#32416)

curtailer/curtailer.go

@@ -0,0 +1,28 @@
+package curtailer
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/evcc-io/evcc/api"
+	"github.com/evcc-io/evcc/util"
+	reg "github.com/evcc-io/evcc/util/registry"
+)
+
+var registry = reg.New[api.Curtailer]("curtailer")
+
+// NewFromConfig creates curtailer from configuration
+func NewFromConfig(ctx context.Context, typ string, other map[string]any) (api.Curtailer, error) {
+	factory, err := registry.Get(strings.ToLower(typ))
+	if err != nil {
+		return nil, err
+	}
+
+	v, err := factory(ctx, other)
+	if err != nil {
+		err = fmt.Errorf("cannot create curtailer type '%s': %w", util.TypeWithTemplateName(typ, other), err)
+	}
+
+	return v, err
+}

curtailer/custom.go

@@ -0,0 +1,45 @@
+package curtailer
+
+import (
+	"context"
+	"errors"
+
+	"github.com/evcc-io/evcc/api"
+	"github.com/evcc-io/evcc/api/implement"
+	"github.com/evcc-io/evcc/meter/measurement"
+	"github.com/evcc-io/evcc/util"
+)
+
+func init() {
+	registry.AddCtx(api.Custom, NewConfigurableFromConfig)
+}
+
+// NewConfigurableFromConfig creates a curtailer from config
+func NewConfigurableFromConfig(ctx context.Context, other map[string]any) (api.Curtailer, error) {
+	cc := struct {
+		measurement.Curtailer `mapstructure:",squash"`
+	}{}
+
+	if err := util.DecodeOther(other, &cc); err != nil {
+		return nil, err
+	}
+
+	curtailS, curtailedG, err := cc.Curtailer.Configure(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	if curtailS == nil {
+		return nil, errors.New("missing curtail")
+	}
+
+	return implement.Curtailer(
+		func() (int, error) {
+			percent, err := curtailedG()
+			return int(percent), err
+		},
+		func(percent int) error {
+			return curtailS(int64(percent))
+		},
+	), nil
+}

curtailer/template.go

@@ -0,0 +1,21 @@
+package curtailer
+
+import (
+	"context"
+
+	"github.com/evcc-io/evcc/api"
+	"github.com/evcc-io/evcc/util/templates"
+)
+
+func init() {
+	registry.AddCtx("template", NewFromTemplateConfig)
+}
+
+func NewFromTemplateConfig(ctx context.Context, other map[string]any) (api.Curtailer, error) {
+	instance, err := templates.RenderInstance(templates.Curtailer, other)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewFromConfig(ctx, instance.Type, instance.Other)
+}

curtailer/template_test.go

@@ -0,0 +1,21 @@
+package curtailer
+
+import (
+	"testing"
+
+	"github.com/evcc-io/evcc/util/templates"
+	"github.com/evcc-io/evcc/util/test"
+)
+
+var acceptable = []string{}
+
+func TestTemplates(t *testing.T) {
+	templates.TestClass(t, templates.Curtailer, func(t *testing.T, values map[string]any) {
+		t.Helper()
+
+		if _, err := NewFromConfig(t.Context(), "template", values); err != nil && !test.Acceptable(err, acceptable) {
+			t.Log(values)
+			t.Error(err)
+		}
+	})
+}