remove rheemcloud pkg, implement against rest api only

pkg/econet/econet.go

@@ -5,17 +5,16 @@ package econet
 
 import (
 	"context"
-	"crypto/tls"
 	"fmt"
-	"log/slog"
-	"net/http"
+	"time"
 
-	rheemcloud "github.com/kevinburke/rheemcloud-go"
+	"github.com/rs/zerolog"
 
 	optsgrpc "gitea.libretechconsulting.com/rmcguire/go-app/pkg/srv/grpc/opts"
 	optshttp "gitea.libretechconsulting.com/rmcguire/go-app/pkg/srv/http/opts"
 
 	"gitea.libretechconsulting.com/rmcguire/econet-exporter/pkg/config"
+	"gitea.libretechconsulting.com/rmcguire/econet-exporter/pkg/econet/econetclient"
 	"gitea.libretechconsulting.com/rmcguire/econet-exporter/pkg/econet/econetgrpc"
 	"gitea.libretechconsulting.com/rmcguire/econet-exporter/pkg/econet/econetmcp"
 	"gitea.libretechconsulting.com/rmcguire/econet-exporter/pkg/econet/econetmetrics"
@@ -25,7 +24,8 @@ import (
 type EconetService struct {
 	ctx     context.Context
 	config  *config.ServiceConfig
-	client  *rheemcloud.Client
+	log     *zerolog.Logger
+	client  *econetclient.Client
 	grpc    *econetgrpc.EconetGRPCServer
 	mcp     *econetmcp.EconetMCPServer
 	metrics *econetmetrics.Collector
@@ -34,46 +34,58 @@ type EconetService struct {
 func (e *EconetService) Init(ctx context.Context, cfg *config.ServiceConfig) (service.ShutdownFunc, error) {
 	e.ctx = ctx
 	e.config = cfg
+	e.log = zerolog.Ctx(ctx)
 
-	client, err := connect(ctx, cfg)
-	if err != nil {
-		return nil, err
+	// Fail fast on missing credentials (cheap, no network).
+	if cfg.EconetEmail == "" || cfg.EconetPassword == "" {
+		return nil, fmt.Errorf("econet: email and password required (set ECONET_EMAIL / ECONET_PASSWORD)")
 	}
-	e.client = client
 
-	e.grpc = econetgrpc.NewEconetGRPCServer(ctx, cfg, client)
+	e.client = econetclient.New(cfg, e.log)
+	e.grpc = econetgrpc.NewEconetGRPCServer(ctx, cfg, e.client)
 	e.mcp = econetmcp.NewEconetMCPServer(ctx, cfg, e.grpc)
-	e.metrics = econetmetrics.NewCollector(ctx, cfg, client)
-	if err := e.metrics.Start(); err != nil {
+	e.metrics = econetmetrics.NewCollector(ctx, cfg, e.client)
+	if err := e.metrics.RegisterGauges(); err != nil {
 		return nil, err
 	}
 
+	// Poll the cloud in the background so a slow or unreachable Rheem cloud
+	// never blocks HTTP/gRPC server startup. Devices are empty until the first
+	// successful refresh; the gauges and gRPC handlers tolerate that.
+	go e.pollLoop(ctx)
+
 	return e.shutdown, nil
 }
 
-func connect(ctx context.Context, cfg *config.ServiceConfig) (*rheemcloud.Client, error) {
-	if cfg.EconetEmail == "" || cfg.EconetPassword == "" {
-		return nil, fmt.Errorf("econet: email and password required (set ECONET_EMAIL / ECONET_PASSWORD)")
+// pollLoop refreshes device state on a ticker for the life of the service.
+// A per-refresh timeout keeps a hung REST call from stalling the loop.
+func (e *EconetService) pollLoop(ctx context.Context) {
+	interval := e.config.GetPollInterval()
+	e.refresh(ctx)
+	t := time.NewTicker(interval)
+	defer t.Stop()
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-t.C:
+			e.refresh(ctx)
+		}
 	}
-	client, err := rheemcloud.Connect(ctx, cfg.EconetEmail, cfg.EconetPassword, &rheemcloud.Config{
-		Logger: slog.Default(),
-		HTTPClient: &http.Client{
-			Transport: &http.Transport{
-				TLSClientConfig: &tls.Config{
-					InsecureSkipVerify: cfg.EconetTLSInsecure,
-				},
-			},
-		},
-	})
-	if err != nil {
-		return nil, fmt.Errorf("econet: connect failed: %w", err)
+}
+
+func (e *EconetService) refresh(ctx context.Context) {
+	rctx, cancel := context.WithTimeout(ctx, e.config.GetPollInterval())
+	defer cancel()
+	if err := e.client.Refresh(rctx); err != nil {
+		e.log.Error().Err(err).Msg("econet: refresh failed")
+		return
 	}
-	return client, nil
+	e.log.Debug().Int("devices", len(e.client.Devices())).Msg("econet: refreshed")
 }
 
 func (e *EconetService) shutdown(_ context.Context) (string, error) {
-	e.metrics.Stop()
-	return "EconetService", e.client.Close()
+	return "EconetService", nil
 }
 
 func (e *EconetService) GetGRPC() *optsgrpc.AppGRPC {
@@ -95,7 +107,7 @@ func (e *EconetService) healthChecks() []optshttp.HealthCheckFunc {
 	return []optshttp.HealthCheckFunc{
 		func(_ context.Context) error {
 			if len(e.client.Devices()) == 0 {
-				return fmt.Errorf("econet: no devices loaded")
+				return fmt.Errorf("econet: no devices loaded yet")
 			}
 			return nil
 		},