Several improvements

* Make Dockerfile build and run correctly on alpine, fix missing sqlite
* Make config shared to avoid reading from file on each request
* Correctly handle Signals to gracefully stop database connection and
  to speed up shutdown, relevant for docker deployment
* Correctly check for sqlite error on table creation

Dockerfile

@@ -2,10 +2,12 @@ FROM thevlang/vlang:alpine AS build
 
 WORKDIR /tmp/app
 COPY . .
-RUN v -prod .
+RUN v -prod -o highscore-server .
 
 FROM alpine:latest
 
+RUN apk --no-cache add sqlite-dev
+
 WORKDIR /app
 COPY --from=build /tmp/app/highscore-server .
 COPY --from=build /tmp/app/config.example.toml ./config.toml

src/config.v

@@ -15,6 +15,10 @@ struct Config {
 	db_path string
 }
 
+fn (config Config) copy() Config {
+	return config
+}
+
 fn load_config() Config {
 	config := toml.parse_file(path) or { panic(err) }
 

src/database.v

@@ -8,7 +8,7 @@ pub mut:
 	time	i64
 }
 
-fn (mut app App) create_tables() bool {
+fn (mut app App) create_tables() int {
 	return app.db.exec_none(
 		"CREATE TABLE IF NOT EXISTS ScoreRes (
 			id INTEGER PRIMARY KEY,
@@ -16,7 +16,7 @@ fn (mut app App) create_tables() bool {
 			score INTEGER NOT NULL,
 			time SQLITE_INT64_TYPE NOT NULL
 		)"
-	) == 0
+	)
 }
 
 fn (mut app App) insert_score(score ScoreRes) {

src/main.v

@@ -2,36 +2,64 @@ module main
 
 import vweb
 import sqlite
+import time
+import os
 
 struct App {
 	vweb.Context
 pub mut:
 	db sqlite.DB
-	config Config
+	config shared Config
 	is_admin bool
 }
 
 fn main() {
 	mut app := &App{}
+	mut app_config := Config{}
 
-	app.config = load_config()
+	lock app.config {
+		app.config = load_config()
+		app_config = app.config.copy()
+	}
 
-	app.db = sqlite.connect(app.config.db_path) or {
-		println('Database Error!')
+	if !os.exists(app_config.db_path) {
+		println("Creating database file at " + app_config.db_path)
+		mut file := os.create(app_config.db_path) or { panic(err) }
+		file.close()
+	}
+
+	app.db = sqlite.connect(app_config.db_path) or {
+		println('Database error!')
 		panic(err)
 	}
 
-	app.create_tables()
+	sql_code := app.create_tables()
+
+	if sqlite.is_error(sql_code) {
+		println('Could not create tables!')
+		panic('Error code ' + sql_code.str())
+	}
 
 	mut host := '::'
-
-	if app.config.host != "" {
-		host = app.config.host
+	if app_config.host != "" {
+		host = app_config.host
 	}
 
+	// Handle graceful shutdown for Docker
+	os.signal_opt(os.Signal.int, app.shutdown) or { panic(err) }
+	os.signal_opt(os.Signal.term, app.shutdown) or { panic(err) }
+
 	vweb.run_at(app, vweb.RunParams{
 		host: host
-		port: app.config.port
+		port: app_config.port
 		family: .ip6
 	}) or { panic(err) }
 }
+
+fn (mut app App) shutdown(sig os.Signal) {
+	app.db.close() or { panic(err) }
+	println("Shut down database gracefully")
+	println("Exiting...")
+	time.sleep(1e+9) // Sleep one second
+	exit(0)
+}

src/web.v

@@ -4,7 +4,7 @@ import vweb
 import json
 import time
 
-struct Status {
+struct ResultStatus {
 	status int
 	message string
 }
@@ -16,8 +16,10 @@ struct ErrorStatus {
 }
 
 pub fn (mut app App) index() vweb.Result {
-	if app.config.redirect {
-		app.redirect(app.config.redirect_url)
+	rlock app.config {
+		if app.config.redirect {
+			app.redirect(app.config.redirect_url)
+		}
 	}
 
 	return app.text("Hello :)")
@@ -69,7 +71,7 @@ pub fn (mut app App) score_submit() vweb.Result {
 	app.insert_score(ScoreRes{player:body.player, score:body.score, time:time.now().unix_time()})
 
 	return app.json(
-		Status {
+		ResultStatus {
 			200,
 			"Success"
 		}
@@ -77,10 +79,14 @@ pub fn (mut app App) score_submit() vweb.Result {
 }
 
 fn (mut app App) auth() bool {
-	app.config = load_config()
-
 	auth_header := app.get_header('Authorization')
 	token := auth_header.after('Bearer ')
 
-	return token == app.config.token
+	mut config_token := ""
+
+	rlock app.config {
+		config_token = app.config.token
+	}
+	
+	return config_token.len != 0 && token == config_token
 }