Move configuration code to a separate file

1 files changed, 42 insertions, 0 deletions

diff --git a/config.go b/config.go
new file mode 100644
index 0000000..3bb153b
--- /dev/null
+++ b/config.go
@@ -0,0 +1,42 @@
+package main
+
+import (
+	"encoding/json"
+	"net/netip"
+	"os"
+	"log"
+)
+
+type RuntimeConfig struct {
+	Devices DevicesConfig
+	Web     WebConfig
+}
+
+type DevicesConfig struct {
+	Hs100 []Hs100Conf
+}
+
+type WebConfig struct {
+	Listen netip.AddrPort
+}
+
+// parseConfig() parses and validates the runtime configuration file and
+// returns it as Go datastructure.
+func parseConfig(path string) RuntimeConfig {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		log.Fatalf("Could not read '%s'!", path)
+	}
+
+	if !json.Valid(data) {
+		log.Fatalf("%s contains invalid JSON!", path)
+	}
+
+	config := RuntimeConfig{}
+	err = json.Unmarshal(data, &config)
+	if err != nil {
+		log.Fatalf("Could not parse configuration file:\n%s\n", err)
+	}
+
+	return config
+}