Add documentation

backend/main.go

@@ -15,10 +15,18 @@ import (
 var migrations embed.FS
 var db *Db
 
+// ServerConfig holds configuration for the server.
 type ServerConfig struct {
+	// The datasource to the SQLite database.
+	// Use ":memory:" for an in-memory database.
 	Datasource string
-	Port       string
-	Started    chan bool
+
+	// The port to listen on.
+	// Use an empty string to listen on a random port.
+	Port string
+
+	// The channel that gets signaled when the server has started.
+	Started chan bool
 }
 
 func getUsers(c *gin.Context) {
@@ -84,6 +92,11 @@ func getUserGoals(c *gin.Context) {
 	c.IndentedJSON(http.StatusOK, goals)
 }
 
+/*
+*
+Initialises the database, and then starts the server.
+If the context gets cancelled, the server is shutdown and the database is closed.
+*/
 func start(ctx context.Context, config *ServerConfig) {
 	db = NewDb(config.Datasource)
 	defer db.db.MustClose()
@@ -104,7 +117,9 @@ func start(ctx context.Context, config *ServerConfig) {
 	}()
 
 	log.Printf("Running server on port %s\n", config.Port)
-	config.Started <- true
+	if config.Started != nil {
+		config.Started <- true
+	}
 	<-ctx.Done()
 	log.Println("Shutting down")
 	if err := srv.Shutdown(context.Background()); err != nil {