refactor: [torrust#634] extract funtions

src/e2e/runner.rs

@@ -14,25 +14,24 @@ use crate::e2e::logs::RunningServices;
 use crate::e2e::temp_dir::Handler;
 
 pub const NUMBER_OF_ARGUMENTS: usize = 2;
+const CONTAINER_TAG: &str = "torrust-tracker:local";
+const TRACKER_CHECKER_CONFIG_FILE: &str = "tracker_checker.json";
+
+pub struct Arguments {
+    pub tracker_config_path: String,
+}
 
 /// # Panics
 ///
 /// Will panic if it can't not perform any of the operations.
 pub fn run() {
-    // todo: const
-    let container_tag: &str = "torrust-tracker:local";
-    let tracker_checker_config_file = "tracker_checker.json";
-
-    setup_logging(LevelFilter::Info);
+    setup_runner_logging(LevelFilter::Info);
 
     let args = parse_arguments();
 
-    // Setup tracker configuration
-    info!("Reading tracker configuration from file: {} ...", args.tracker_config_path);
-    let tracker_config = read_tracker_config(&args.tracker_config_path);
+    let tracker_config = load_tracker_configuration(&args.tracker_config_path);
 
-    // Build tracker container image
-    Docker::build("./Containerfile", container_tag).expect("A tracker local docker image should be built");
+    build_tracker_container_image(CONTAINER_TAG);
 
     // Create temp dir
     info!(
@@ -57,7 +56,7 @@ pub fn run() {
         "1313:1313/tcp".to_string(),
     ];
     let container =
-        Docker::run(container_tag, &container_name, &env_vars, &ports).expect("A tracker local docker image should be running");
+        Docker::run(CONTAINER_TAG, &container_name, &env_vars, &ports).expect("A tracker local docker image should be running");
 
     info!("Waiting for the container {container_name} to be healthy ...");
     let is_healthy = Docker::wait_until_is_healthy(&container_name, Duration::from_secs(10));
@@ -80,7 +79,7 @@ pub fn run() {
     // Write tracker_checker configuration file
 
     let mut absolute_tracker_checker_config_path = PathBuf::from(&temp_dir_handler.temp_dir.path());
-    absolute_tracker_checker_config_path.push(tracker_checker_config_file);
+    absolute_tracker_checker_config_path.push(TRACKER_CHECKER_CONFIG_FILE);
 
     let mut file = File::create(absolute_tracker_checker_config_path.clone()).expect("Tracker checker config file to be created");
     file.write_all(json.as_bytes())
@@ -104,7 +103,7 @@ pub fn run() {
     info!("Running container `{}` will be automatically removed", container.name);
 }
 
-fn setup_logging(level: LevelFilter) {
+fn setup_runner_logging(level: LevelFilter) {
     if let Err(_err) = fern::Dispatch::new()
         .format(|out, message, record| {
             out.finish(format_args!(
@@ -125,10 +124,6 @@ fn setup_logging(level: LevelFilter) {
     debug!("logging initialized.");
 }
 
-pub struct Arguments {
-    pub tracker_config_path: String,
-}
-
 fn parse_arguments() -> Arguments {
     let args: Vec<String> = std::env::args().collect();
 
@@ -145,11 +140,21 @@ fn parse_arguments() -> Arguments {
     }
 }
 
+fn load_tracker_configuration(tracker_config_path: &str) -> String {
+    info!("Reading tracker configuration from file: {} ...", tracker_config_path);
+    read_tracker_config(tracker_config_path)
+}
+
 fn read_tracker_config(tracker_config_path: &str) -> String {
     std::fs::read_to_string(tracker_config_path)
         .unwrap_or_else(|_| panic!("Can't read tracker config file {tracker_config_path}"))
 }
 
+fn build_tracker_container_image(tag: &str) {
+    info!("Building tracker container image with tag: {} ...", tag);
+    Docker::build("./Containerfile", tag).expect("A tracker local docker image should be built");
+}
+
 fn generate_random_container_name(prefix: &str) -> String {
     let rand_string: String = rand::thread_rng()
         .sample_iter(&Alphanumeric)