feat(server): add param to define logs directory (#551)

## What problem are you trying to solve?

IntelliJ would like to define the directory to save the logs.

## What is your solution?

Added a new option to define the path of the folder to save the logs.

## Alternatives considered

## What the reviewer should know

IDE-3777

crates/bins/src/bin/datadog_static_analyzer_server/cli.rs

@@ -31,30 +31,38 @@ fn get_opts() -> Options {
         "directory for static files",
         "/path/to/directory",
     );
-    opts.optopt("p", "port", "port to run the server on", "8000");
-    opts.optopt("a", "address", "address to listen on", "127.0.0.1");
+    opts.optopt("p", "port", "Port to run the server on", "8000");
+    opts.optopt("a", "address", "Address to listen on", "127.0.0.1");
     opts.optopt(
         "k",
         "keep-alive-timeout",
-        "how many seconds without a request the server will exit",
+        "How many seconds without a request the server will exit",
         "90",
     );
-    opts.optflag("e", "enable-shutdown", "enables the shutdown endpoint");
-    opts.optflag("h", "help", "print this help");
-    opts.optflag("v", "version", "shows the tool version");
+    opts.optflag("e", "enable-shutdown", "Enables the shutdown endpoint");
+    opts.optflag("h", "help", "Print this help");
+    opts.optflag("v", "version", "Shows the tool version");
+
     opts.optopt(
         "l",
         "logs",
         "Enables log rotation and saves logs to a file in a system temp folder. Options: minutely, hourly, daily",
         "[minutely, hourly, daily]",
     );
 
+    opts.optopt(
+        "d",
+        "logs-dir",
+        "Allows to define the directory where the logs will be saved",
+        "/tmp/static-analysis-server",
+    );
+
     // TODO (JF): Remove this when releasing 0.3.8
     opts.optflag("", "ddsa-runtime", "(deprecated)");
     opts
 }
 
-fn get_log_dir() -> PathBuf {
+fn get_default_log_dir() -> PathBuf {
     let path = "static-analysis-server/logs";
     #[cfg(unix)]
     {
@@ -138,7 +146,9 @@ pub fn prepare_rocket(tx_keep_alive_error: Sender<i32>) -> Result<RocketPreparat
     // initialize the tracing subscriber here as we're only interested in the server logs not the other CLI instructions
     let guard = if let Some(log_rolling) = matches.opt_str("l") {
         // tracing with logs
-        let log_dir = get_log_dir();
+        let log_dir = matches
+            .opt_str("d")
+            .map_or_else(get_default_log_dir, std::convert::Into::into);
         let file_appender = try_to_file_appender(
             log_rolling,
             log_dir,

crates/bins/src/bin/datadog_static_analyzer_server/mod.rs

@@ -60,10 +60,7 @@ pub async fn start() {
             // launch the rocket and check if we receive a keep-alive error
             let result = rocket::tokio::select! {
                 a = endpoints::launch_rocket_with_endpoints(*rocket, tx_rocket_shutdown) => a,
-                b = rx_keep_alive_error.recv() => match b {
-                    Some(c) => Err(c.into()),
-                    _ => Err(EndpointError::ExitCode(ERROR_CHANNEL_SENDER_DROPPED))
-                },
+                b = rx_keep_alive_error.recv() => b.map_or_else(|| Err(EndpointError::ExitCode(ERROR_CHANNEL_SENDER_DROPPED)), |c| Err(c.into())),
             };
 
             if let Err(e) = result {