chore: refactor plugin structure (#18335)

plugin/sma.go

@@ -0,0 +1,97 @@
+package plugin
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/evcc-io/evcc/plugin/sma"
+	"github.com/evcc-io/evcc/util"
+	"gitlab.com/bboehmke/sunny"
+)
+
+// SMA provider
+type SMA struct {
+	device *sma.Device
+	value  sunny.ValueID
+	scale  float64
+}
+
+func init() {
+	registry.Add("sma", NewSMAFromConfig)
+}
+
+// NewSMAFromConfig creates SMA provider
+func NewSMAFromConfig(other map[string]interface{}) (Plugin, error) {
+	cc := struct {
+		URI, Password, Interface string
+		Serial                   uint32
+		Value                    string
+		Scale                    float64
+	}{
+		Password: "0000",
+		Scale:    1,
+	}
+
+	if err := util.DecodeOther(other, &cc); err != nil {
+		return nil, err
+	}
+
+	discoverer, err := sma.GetDiscoverer(cc.Interface)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get discoverer failed: %w", err)
+	}
+
+	o := &SMA{
+		scale: cc.Scale,
+	}
+	switch {
+	case cc.URI != "":
+		o.device, err = discoverer.DeviceByIP(cc.URI, cc.Password)
+		if err != nil {
+			return nil, err
+		}
+
+	case cc.Serial > 0:
+		o.device = discoverer.DeviceBySerial(cc.Serial, cc.Password)
+		if o.device == nil {
+			return nil, fmt.Errorf("device not found: %d", cc.Serial)
+		}
+
+	default:
+		return nil, errors.New("missing uri or serial")
+	}
+
+	o.value, err = sunny.ValueIDString(cc.Value)
+
+	return o, err
+}
+
+var _ FloatGetter = (*SMA)(nil)
+
+// FloatGetter creates handler for float64
+func (p *SMA) FloatGetter() (func() (float64, error), error) {
+	return func() (float64, error) {
+		values, err := p.device.Values()
+		if err != nil {
+			return 0, err
+		}
+
+		return sma.AsFloat(values[p.value]) * p.scale, nil
+	}, nil
+}
+
+var _ IntGetter = (*SMA)(nil)
+
+// IntGetter creates handler for int64
+func (p *SMA) IntGetter() (func() (int64, error), error) {
+	g, err := p.FloatGetter()
+
+	return func() (int64, error) {
+		f, err := g()
+		if err != nil {
+			return 0, err
+		}
+
+		return int64(f), nil
+	}, err
+}