wip

Signed-off-by: Thomas Klaehn <tkl@blackfinn.de>

internal/api/charger_proxy.go

@@ -0,0 +1,96 @@
+package api
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+)
+
+type ChargerStatus struct {
+	Car       int     `json:"car"`
+	Frc       int     `json:"frc"`
+	SessionWh float64 `json:"session_wh"`
+	Amp       int     `json:"amp"`
+	Soc       int     `json:"soc"` // car battery %, 0 = not reported by car
+}
+
+type goeStatus struct {
+	Car int     `json:"car"`
+	Frc int     `json:"frc"`
+	Wh  float64 `json:"wh"`
+	Amp int     `json:"amp"`
+	Soc int     `json:"soc"`
+}
+
+var chargerHTTP = &http.Client{Timeout: 5 * time.Second}
+
+func fetchChargerStatus(host string) (ChargerStatus, error) {
+	url := "http://" + host + "/api/status?filter=car,frc,wh,amp,soc"
+	resp, err := chargerHTTP.Get(url)
+	if err != nil {
+		return ChargerStatus{}, fmt.Errorf("charger unreachable: %w", err)
+	}
+	defer resp.Body.Close()
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return ChargerStatus{}, err
+	}
+	var s goeStatus
+	if err := json.Unmarshal(body, &s); err != nil {
+		return ChargerStatus{}, err
+	}
+	return ChargerStatus{Car: s.Car, Frc: s.Frc, SessionWh: s.Wh, Amp: s.Amp, Soc: s.Soc}, nil
+}
+
+func setChargerFrc(host string, frc int) error {
+	url := fmt.Sprintf("http://%s/api/set?frc=%d", host, frc)
+	resp, err := chargerHTTP.Get(url)
+	if err != nil {
+		return fmt.Errorf("charger unreachable: %w", err)
+	}
+	defer resp.Body.Close()
+	return nil
+}
+
+func setChargerAmp(host string, amps int) error {
+	url := fmt.Sprintf("http://%s/api/set?amp=%d", host, amps)
+	resp, err := chargerHTTP.Get(url)
+	if err != nil {
+		return fmt.Errorf("charger unreachable: %w", err)
+	}
+	defer resp.Body.Close()
+	return nil
+}
+
+// resetCharger sends rst=1 and waits for the charger to reboot.
+// frc is reset to 0 by the charger firmware, so callers must re-apply mode after this.
+func resetCharger(host string) error {
+	url := "http://" + host + "/api/set?rst=1"
+	resp, _ := chargerHTTP.Get(url) // charger may close connection before responding
+	if resp != nil {
+		resp.Body.Close()
+	}
+	time.Sleep(8 * time.Second)
+	if _, err := fetchChargerStatus(host); err != nil {
+		return fmt.Errorf("charger did not recover from reset: %w", err)
+	}
+	return nil
+}
+
+// setChargerPhases switches between 1-phase (psm=1) and 3-phase (psm=2).
+// Requires phase-switching hardware in the charger.
+func setChargerPhases(host string, phases int) error {
+	psm := 2
+	if phases == 1 {
+		psm = 1
+	}
+	url := fmt.Sprintf("http://%s/api/set?psm=%d", host, psm)
+	resp, err := chargerHTTP.Get(url)
+	if err != nil {
+		return fmt.Errorf("charger unreachable: %w", err)
+	}
+	defer resp.Body.Close()
+	return nil
+}