Add cache control configuration and initialization

README.md

@@ -29,6 +29,8 @@ services:
   tesla-ble-http-proxy:
     image: wimaha/tesla-ble-http-proxy
     container_name: tesla-ble-http-proxy
+    environment:
+      - cacheMaxAge=30 # Optional, but recommended to set this to anything more than 0 if you are using the vehicle data
     volumes:
       - ~/TeslaBleHttpProxy/key:/key
       - /var/run/dbus:/var/run/dbus
@@ -44,6 +46,8 @@ Please remember to create an empty folder where the keys can be stored later. In
 
 Pull and start TeslaBleHttpProxy with `docker compose up -d`.
 
+Note that you can optionally set environment variables to override the default behavior. See [environment variables](docs/environment_variables.md) for more information.
+
 ### Build yourself
 
 Download the code and save it in a folder named 'TeslaBleHttpProxy'. From there, you can easily compile the program.
@@ -55,6 +59,8 @@ go build .
 
 Please remember to create an empty folder called `key` where the keys can be stored later.
 
+Note that you can optionally set environment variables to override the default behavior. See [environment variables](docs/environment_variables.md) for more information.
+
 ## Generate key for vehicle
 
 *(Here, the simple, automatic method is described. Besides the automatic method, you can also generate the keys [manually](docs/manually_gen_key.md).)*
@@ -79,59 +85,18 @@ You can now close the dashboard and use the proxy. 🙂
 
 ## Setup EVCC
 
-If you want to use solely TeslaBleHttpProxy, you can use the following configuration in evcc (recommended):
+You can use the following configuration in evcc (recommended):
 
 ```
 vehicles:
   - name: tesla
-    type: custom
-    title: Your Tesla
-    icon: car
-    capacity: 60
-    chargeenable:
-      source: http
-      uri: "http://IP:8080/api/1/vehicles/VIN/command/{{if .chargeenable}}charge_start{{else}}charge_stop{{end}}"
-      method: POST
-      body: ""
-    maxcurrent: # set charger max current (A)
-      source: http
-      uri: http://IP:8080/api/1/vehicles/VIN/command/set_charging_amps
-      method: POST
-      body: '{"charging_amps": "{{.maxcurrent}}"}'
-    wakeup: # vehicle wake up command
-      source: http
-      uri: http://IP:8080/api/1/vehicles/VIN/command/wake_up
-      method: POST
-      body: ""
-    soc:
-      source: http
-      uri: http://IP:8080/api/1/vehicles/VIN/vehicle_data?endpoints=charge_state
-      method: GET
-      jq: .response.response.charge_state.battery_level
-      timeout: 30s 
-    limitsoc:
-      source: http
-      uri: http://IP:8080/api/1/vehicles/VIN/vehicle_data?endpoints=charge_state
-      method: GET
-      jq: .response.response.charge_state.charge_limit_soc
-      timeout: 30s
-    range:
-      source: http
-      uri: http://IP:8080/api/1/vehicles/VIN/vehicle_data?endpoints=charge_state
-      method: GET
-      jq: .response.response.charge_state.battery_range
-      scale: 1.60934
-      timeout: 30s
-    status:
-      source: http
-      uri: http://IP:8080/api/1/vehicles/VIN/vehicle_data?endpoints=charge_state
-      method: GET
-      jq: (if (.response.response.charge_state.charging_state == "Charging") then "C"
-        elif (.response.response.charge_state.charging_state == "Stopped") then "B"
-        elif (.response.response.charge_state.charging_state == "NoPower") then "B"
-        elif (.response.response.charge_state.charging_state == "Complete") then "B" 
-        else "A" end)
-      timeout: 30s 
+    type: template
+    template: tesla-ble
+    title: Your Tesla (optional)
+    capacity: 60 # Akkukapazität in kWh (optional)
+    vin: VIN # Erforderlich für BLE-Verbindung
+    url: IP # URL des Tesla BLE HTTP Proxy
+    port: 8080 # Port des Tesla BLE HTTP Proxy (optional)
 ```
 
 If you want to use this proxy only for commands, and not for vehicle data, you can use the following configuration. The vehicle data is then fetched via the Tesla API by evcc.

config/config.go

@@ -2,6 +2,7 @@ package config
 
 import (
 	"os"
+	"strconv"
 
 	"github.com/charmbracelet/log"
 )
@@ -12,8 +13,11 @@ var PrivateKeyFile = "key/private.pem"
 type Config struct {
 	LogLevel          string
 	HttpListenAddress string
+	CacheMaxAge       int // Seconds to cache BLE responses
 }
 
+var AppConfig *Config
+
 func LoadConfig() *Config {
 	envLogLevel := os.Getenv("logLevel")
 	if envLogLevel == "debug" {
@@ -30,8 +34,23 @@ func LoadConfig() *Config {
 	}
 	log.Info("TeslaBleHttpProxy", "httpListenAddress", addr)
 
+	cacheMaxAge := os.Getenv("cacheMaxAge")
+	if cacheMaxAge == "" {
+		cacheMaxAge = "0" // default value
+	}
+	cacheMaxAgeInt, err := strconv.Atoi(cacheMaxAge)
+	if err != nil {
+		log.Error("Invalid cacheMaxAge value, using default (0)", "error", err)
+		cacheMaxAgeInt = 0
+	}
+
 	return &Config{
 		LogLevel:          envLogLevel,
 		HttpListenAddress: addr,
+		CacheMaxAge:       cacheMaxAgeInt,
 	}
 }
+
+func InitConfig() {
+	AppConfig = LoadConfig()
+}

docs/environment_variables.md

@@ -0,0 +1,37 @@
+# Environment variables
+
+You can optionally set environment variables to override the default behavior.
+
+## logLevel
+
+This is the log level. Options: debug, info, warn, error, fatal (Default: info)
+
+## cacheMaxAge
+
+This is the number of seconds to cache the BLE responses. If set to 0, the cache is disabled. (Default: 0)
+
+## httpListenAddress
+
+This is the address and port to listen for HTTP requests. (Default: :8080)
+
+# Example
+
+## Docker compose
+You can set the environment variables in your docker-compose.yml file. Example:
+
+```
+environment:
+  - logLevel=debug
+  - cacheMaxAge=30
+  - httpListenAddress=:5687
+```
+
+This will set the log level to debug, the cache max age to 30 seconds, and the HTTP listen address to :5687.
+
+## Command line
+
+You can also set the environment variables in the command line when starting the program. Example:
+
+```
+./TeslaBleHttpProxy -logLevel=debug -cacheMaxAge=30 -httpListenAddress=:5687
+```

docs/installation.md

@@ -70,6 +70,8 @@ services:
   tesla-ble-http-proxy:
     image: wimaha/tesla-ble-http-proxy
     container_name: tesla-ble-http-proxy
+    environment:
+      - cacheMaxAge=30 # Optional, but recommended to set this to anything more than 0 if you are using the vehicle data
     volumes:
       - ~/TeslaBleHttpProxy/key:/key
       - /var/run/dbus:/var/run/dbus
@@ -83,6 +85,8 @@ services:
 
 Exit the file with control + x and type `y` to save the file.
 
+Note that you can optionally set environment variables to override the default behavior. See [environment variables](docs/environment_variables.md) for more information.
+
 ### Step A-3: Start the container
 
 Start the container with the following command:

internal/api/handlers/tesla.go

@@ -12,6 +12,7 @@ import (
 
 	"github.com/charmbracelet/log"
 	"github.com/gorilla/mux"
+	"github.com/wimaha/TeslaBleHttpProxy/config"
 	"github.com/wimaha/TeslaBleHttpProxy/internal/api/models"
 	"github.com/wimaha/TeslaBleHttpProxy/internal/ble/control"
 	"github.com/wimaha/TeslaBleHttpProxy/internal/tesla/commands"
@@ -140,6 +141,8 @@ func VehicleData(w http.ResponseWriter, r *http.Request) {
 
 	wg.Wait()
 
+	SetCacheControl(w, config.AppConfig.CacheMaxAge)
+
 	if apiResponse.Result {
 		response.Result = true
 		response.Reason = "The request was successfully processed."
@@ -189,6 +192,8 @@ func BodyControllerState(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 
+		SetCacheControl(w, config.AppConfig.CacheMaxAge)
+
 		if apiResponse.Result {
 			response.Result = true
 			response.Reason = "The request was successfully processed."
@@ -202,3 +207,11 @@ func BodyControllerState(w http.ResponseWriter, r *http.Request) {
 		response.Reason = err.Error()
 	}
 }
+
+func SetCacheControl(w http.ResponseWriter, maxAge int) {
+	if maxAge > 0 {
+		w.Header().Set("Cache-Control", fmt.Sprintf("public, max-age=%d, must-revalidate", maxAge))
+	} else {
+		w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
+	}
+}

main.go

@@ -21,12 +21,12 @@ var Version = "*undefined*"
 func main() {
 	log.Infof("TeslaBleHttpProxy %s is loading ...", Version)
 
-	config := config.LoadConfig()
+	config.InitConfig()
 
 	control.SetupBleControl()
 
 	router := routes.SetupRoutes(static, html)
 
 	log.Info("TeslaBleHttpProxy is running!")
-	log.Fatal(http.ListenAndServe(config.HttpListenAddress, router))
+	log.Fatal(http.ListenAndServe(config.AppConfig.HttpListenAddress, router))
 }