From e767cf0fbcb700fd2216654e5b2ede92279c6e5e Mon Sep 17 00:00:00 2001
From: andig <cpuidle@gmx.de>
Date: Mon, 4 Jan 2021 14:41:45 +0100
Subject: [PATCH] Switch into demo mode when config file not available

---
 cmd/charger.go |  5 ++-
 cmd/demo.go    | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++
 cmd/dump.go    |  5 ++-
 cmd/meter.go   |  5 ++-
 cmd/root.go    |  7 ++++-
 cmd/setup.go   |  6 ++--
 cmd/vehicle.go |  5 ++-
 7 files changed, 109 insertions(+), 8 deletions(-)
 create mode 100644 cmd/demo.go

diff --git a/cmd/charger.go b/cmd/charger.go
index 9a8594be2..0a86ef50a 100644
--- a/cmd/charger.go
+++ b/cmd/charger.go
@@ -24,7 +24,10 @@ func runCharger(cmd *cobra.Command, args []string) {
 	log.INFO.Printf("evcc %s (%s)", server.Version, server.Commit)
 
 	// load config
-	conf := loadConfigFile(cfgFile)
+	conf, err := loadConfigFile(cfgFile)
+	if err != nil {
+		log.FATAL.Fatal(err)
+	}
 
 	// setup mqtt
 	if conf.Mqtt.Broker != "" {
diff --git a/cmd/demo.go b/cmd/demo.go
new file mode 100644
index 000000000..29e09d44e
--- /dev/null
+++ b/cmd/demo.go
@@ -0,0 +1,84 @@
+package cmd
+
+import (
+	"github.com/spf13/viper"
+	"gopkg.in/yaml.v3"
+)
+
+const demoYaml = `
+log: info
+
+meters:
+- name: grid
+  type: default
+  power:
+    type: js
+    script: "1200"
+- name: pv
+  type: default
+  power:
+    type: js
+    script: "6400"
+- name: battery
+  type: default
+  power:
+    type: js
+    script: "200"
+  soc:
+    type: js
+    script: "30"
+
+chargers:
+- name: demo
+  type: default
+  enable:
+    type: js
+    script: "true"
+  enabled:
+    type: js
+    script: "true"
+  status:
+    type: js
+    script: "'B'"
+  maxcurrent:
+    type: js
+    script: "6"
+
+vehicles:
+- name: demo
+  title: e-Golf
+  type: default
+  charge:
+    type: js
+    script: "63"
+
+site:
+  title: Demo
+  meters:
+    grid: grid
+    pv: pv
+    battery: battery
+
+loadpoints:
+- title: Carport
+  charger: demo
+  vehicle: demo
+`
+
+func demoConfig() (conf config) {
+	demo := map[string]interface{}{}
+
+	if err := yaml.Unmarshal([]byte(demoYaml), &demo); err != nil {
+		log.FATAL.Fatalf("failed decoding demo config: %+v", err)
+	}
+
+	for k, v := range demo {
+		viper.Set(k, v)
+	}
+
+	if err := viper.UnmarshalExact(&conf); err != nil {
+		log.FATAL.Fatalf("failed loading demo config: %v", err)
+	}
+
+	return conf
+}
diff --git a/cmd/dump.go b/cmd/dump.go
index 0ec76bc31..45c481fa3 100644
--- a/cmd/dump.go
+++ b/cmd/dump.go
@@ -26,7 +26,10 @@ func runDump(cmd *cobra.Command, args []string) {
 	log.INFO.Printf("evcc %s (%s)", server.Version, server.Commit)
 
 	// load config
-	conf := loadConfigFile(cfgFile)
+	conf, err := loadConfigFile(cfgFile)
+	if err != nil {
+		log.FATAL.Fatal(err)
+	}
 
 	// setup mqtt
 	if conf.Mqtt.Broker != "" {
diff --git a/cmd/meter.go b/cmd/meter.go
index d8d7f2a5b..73c67d5eb 100644
--- a/cmd/meter.go
+++ b/cmd/meter.go
@@ -24,7 +24,10 @@ func runMeter(cmd *cobra.Command, args []string) {
 	log.INFO.Printf("evcc %s (%s)", server.Version, server.Commit)
 
 	// load config
-	conf := loadConfigFile(cfgFile)
+	conf, err := loadConfigFile(cfgFile)
+	if err != nil {
+		log.FATAL.Fatal(err)
+	}
 
 	// setup mqtt
 	if conf.Mqtt.Broker != "" {
diff --git a/cmd/root.go b/cmd/root.go
index 9c3a74fb3..4f7c2c79e 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -142,7 +142,12 @@ func run(cmd *cobra.Command, args []string) {
 	log.INFO.Printf("evcc %s (%s)", server.Version, server.Commit)
 
 	// load config and re-configure logging after reading config file
-	conf := loadConfigFile(cfgFile)
+	conf, err := loadConfigFile(cfgFile)
+	if err != nil {
+		log.ERROR.Println("missing evcc config - switching into demo mode")
+		conf = demoConfig()
+	}
+
 	util.LogLevel(viper.GetString("log"), viper.GetStringMapString("levels"))
 
 	uri := viper.GetString("uri")
diff --git a/cmd/setup.go b/cmd/setup.go
index 9060fbbfd..9d3a3f5c4 100644
--- a/cmd/setup.go
+++ b/cmd/setup.go
@@ -131,15 +131,15 @@ func configureLoadPoints(conf config, cp *ConfigProvider) (loadPoints []*core.Lo
 	return loadPoints, nil
 }
 
-func loadConfigFile(cfgFile string) (conf config) {
+func loadConfigFile(cfgFile string) (conf config, err error) {
 	if cfgFile != "" {
 		log.INFO.Println("using config file", cfgFile)
 		if err := viper.UnmarshalExact(&conf); err != nil {
 			log.FATAL.Fatalf("failed parsing config file %s: %v", cfgFile, err)
 		}
 	} else {
-		log.FATAL.Fatal("missing evcc config")
+		err = errors.New("missing evcc config")
 	}
 
-	return conf
+	return conf, err
 }
diff --git a/cmd/vehicle.go b/cmd/vehicle.go
index 5c07f6da4..d9d00b90a 100644
--- a/cmd/vehicle.go
+++ b/cmd/vehicle.go
@@ -24,7 +24,10 @@ func runVehicle(cmd *cobra.Command, args []string) {
 	log.INFO.Printf("evcc %s (%s)", server.Version, server.Commit)
 
 	// load config
-	conf := loadConfigFile(cfgFile)
+	conf, err := loadConfigFile(cfgFile)
+	if err != nil {
+		log.FATAL.Fatal(err)
+	}
 
 	// setup mqtt
 	if conf.Mqtt.Broker != "" {