Merge branch 'server-version'

This is required to let the client identify the server version.

6 files changed, 31 insertions, 3 deletions

diff --git a/README.md b/README.md
index e0555a0..845a068 100644
--- a/README.md
+++ b/README.md
@@ -105,6 +105,17 @@ For all terms not explained here see the [MQTT version 3.1.1 documentation][9].
     - `good`: Sia server is connected to MQTT broker
     - `bad`: Sia server is disconnected from MQTT broker
 
+### `/server/version`
+
+- description: Sia server version string from VERSION.txt
+- direction: Sia server to client
+- Quality of Service: QoS 1 (at least once)
+- retained: yes
+- receives will message: no
+- topic parameters: none
+- payloads:
+    - `<version>`: version string of the publishing Sia server without newline
+
 ### `/contact/<id>/state`
 
 - description: Indicates state of Homematic IP SWDO-2 contacts
diff --git a/VERSION.txt b/VERSION.txt
new file mode 100644
index 0000000..0d4d124
--- /dev/null
+++ b/VERSION.txt
@@ -0,0 +1 @@
+0.1.0-dev
diff --git a/main.go b/main.go
index ef59574..037b8de 100644
--- a/main.go
+++ b/main.go
@@ -13,8 +13,8 @@ func main() {
 	flags := Flags{}
 	flags.FromArgs()
 
-	log.Println("+++ Started Sia server +++")
-	defer log.Println("--- Stopped Sia server ---")
+	log.Printf("+++ Started Sia server version %s +++", Version())
+	defer log.Printf("--- Stopped Sia server version %s ---", Version())
 
 	config := GetStartupConfig(flags.ConfigPath)
 
diff --git a/meson.build b/meson.build
index 0738894..f830b42 100644
--- a/meson.build
+++ b/meson.build
@@ -1,6 +1,6 @@
 project(
   'sia-server',
-  version : '0.1.0-dev',
+  version : files('VERSION.txt'),
 )
 
 go = find_program('go', required : true)
@@ -18,6 +18,7 @@ changelog = fs.copyfile(meson.current_source_dir() / 'CHANGELOG.md')
 sia_server_linux_amd64 = custom_target(
   input : [
     meson.current_source_dir() / 'main.go',
+    meson.current_source_dir() / 'version.go',
     meson.current_source_dir() / 'cache.go',
     meson.current_source_dir() / 'mqtt.go',
     meson.current_source_dir() / 'homematic.go',
diff --git a/mqtt.go b/mqtt.go
index acd0108..26b6444 100644
--- a/mqtt.go
+++ b/mqtt.go
@@ -46,6 +46,7 @@ func (m MQTTMessage) String() string {
 
 func MQTTRun(config MQTTConfig, tx chan MQTTMessage, routes ...Route) {
 	mqttServerHealthTopic = fmt.Sprintf("%s/server/health", config.TopicPrefix)
+	mqttServerVersionTopic := fmt.Sprintf("%s/server/version", config.TopicPrefix)
 
 	opts := mqtt.NewClientOptions()
 	opts.AddBroker(config.Broker)
@@ -54,6 +55,7 @@ func MQTTRun(config MQTTConfig, tx chan MQTTMessage, routes ...Route) {
 	opts.SetOnConnectHandler(func(c mqtt.Client) {
 		log.Printf("Connected to MQTT broker.")
 		c.Publish(mqttServerHealthTopic, QoS1, true, []byte(`good`))
+		c.Publish(mqttServerVersionTopic, QoS1, true, []byte(Version()))
 
 		for _, route := range routes {
 			topic := config.TopicPrefix + "/" + route.Topic
diff --git a/version.go b/version.go
new file mode 100644
index 0000000..91d58bc
--- /dev/null
+++ b/version.go
@@ -0,0 +1,13 @@
+package main
+
+import (
+	_ "embed"
+	"strings"
+)
+
+//go:embed VERSION.txt
+var rawVersion string
+
+func Version() string {
+	return strings.TrimSuffix(rawVersion, "\n")
+}