add ui, new config opts

pkg/config/custom.go

@@ -34,6 +34,19 @@ type ServiceConfig struct {
 	// usage are re-fetched over REST.
 	PollInterval time.Duration `yaml:"pollInterval" json:"pollInterval,omitempty" env:"ECONET_POLL_INTERVAL"`
 
+	// EnableWebUI toggles the admin UI served at /. It defaults to enabled:
+	// a pointer so an unset value (nil) is distinguishable from an explicit
+	// false, which is what makes the default actually true at runtime —
+	// LoadEnv's plain env.Parse does not apply the `default` tag (that tag
+	// only feeds the JSON schema). Use WebUIEnabled to read it.
+	EnableWebUI *bool `yaml:"enableWebUI" json:"enableWebUI,omitempty" env:"ECONET_ENABLE_WEB_UI" default:"true"`
+
+	// DisableWaterUsage skips the per-device water-usage REST call on each
+	// refresh. Handy for units that don't report water usage, where the call is
+	// wasted work and just produces debug-log noise. Zero value (false) keeps
+	// water usage enabled, so unlike EnableWebUI this needs no pointer.
+	DisableWaterUsage bool `yaml:"disableWaterUsage" json:"disableWaterUsage,omitempty" env:"ECONET_DISABLE_WATER_USAGE" default:"false"`
+
 	// Embeds go-app config, used by go-app to
 	// merge custom config into go-app config, and to produce
 	// a complete configuration json schema
@@ -51,6 +64,12 @@ func (c *ServiceConfig) LoadEnv() error {
 	return env.Parse(c)
 }
 
+// WebUIEnabled reports whether the admin UI should be served. Unset defaults to
+// true; set enableWebUI: false (or ECONET_ENABLE_WEB_UI=false) to disable it.
+func (c *ServiceConfig) WebUIEnabled() bool {
+	return c.EnableWebUI == nil || *c.EnableWebUI
+}
+
 // GetPollInterval returns the configured poll interval or the default.
 func (c *ServiceConfig) GetPollInterval() time.Duration {
 	if c.PollInterval <= 0 {

pkg/config/custom_test.go

@@ -0,0 +1,24 @@
+package config
+
+import "testing"
+
+func TestWebUIEnabledDefaultsTrue(t *testing.T) {
+	tru, fls := true, false
+	cases := []struct {
+		name string
+		in   *bool
+		want bool
+	}{
+		{"unset defaults to enabled", nil, true},
+		{"explicit true", &tru, true},
+		{"explicit false", &fls, false},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			c := &ServiceConfig{EnableWebUI: tc.in}
+			if got := c.WebUIEnabled(); got != tc.want {
+				t.Errorf("WebUIEnabled() = %v, want %v", got, tc.want)
+			}
+		})
+	}
+}