extra logging

Program.cs

@@ -4,40 +4,65 @@ using Cronos;
 using Renci.SshNet;
 using Renci.SshNet.Sftp;
 using Serilog;
+using Serilog.Core;
+using Serilog.Events;
 
 var resetEvent = new ManualResetEvent(false);
 using var tokenSource = new CancellationTokenSource();
 
-Console.CancelKeyPress += (sender, eventArgs) =>
+Console.CancelKeyPress += (_, eventArgs) =>
 {
-    resetEvent?.Set();
-    tokenSource?.Cancel();
+    Log.Debug("Canceling with CancelKeyPress");
+    Dispose();
     eventArgs.Cancel = true;
-    Log.CloseAndFlush();
 };
 
+AppDomain.CurrentDomain.ProcessExit += (_, _) => Dispose();
+
 SetupLogging();
 
+//TODO: check environment variables to see if config file is enabled, otherwise use env vars
 var config = LoadConfig();
 Log.Information("Configuration file loaded. Beginning initial grab.");
 await RunJob(config, tokenSource.Token);
 Log.Information("Initial grab complete. Initializing schedule.");
 Task.Run(() => ScheduleJobs(config, tokenSource.Token));
 
+Log.Verbose("Jobs scheduled. Main Thread waiting.");
 resetEvent.WaitOne();
 
 return;
 
+void Dispose()
+{
+    resetEvent?.Set();
+    tokenSource?.Cancel();
+    Log.CloseAndFlush();
+}
+
 static void SetupLogging()
 {
+    var minLevel = (Environment.GetEnvironmentVariable("LOG_LEVEL") ?? "info").ToUpperInvariant() switch
+    {
+        "VERBOSE" => LogEventLevel.Verbose,
+        "DEBUG" => LogEventLevel.Debug,
+        "WARNING" => LogEventLevel.Warning,
+        "ERROR" => LogEventLevel.Error,
+        "FATAL" => LogEventLevel.Fatal,
+        _ => LogEventLevel.Information
+    };
+    var levelSwitch =  new LoggingLevelSwitch(minLevel);
+    
     Log.Logger = new LoggerConfiguration()
-        .MinimumLevel.Information()
+        .MinimumLevel.ControlledBy(levelSwitch)
         .WriteTo.Console()
         .WriteTo.File("log.txt",
             rollingInterval: RollingInterval.Day, 
             rollOnFileSizeLimit: true,
             retainedFileCountLimit: 10)
         .CreateLogger();
+    
+    Log.Debug($"Logging initialized at {minLevel}");
 }
 
 static Config LoadConfig()
@@ -48,13 +73,14 @@ static Config LoadConfig()
         WriteIndented = true
     };
 
+    //TODO: stop creating dummy config file
     if (!File.Exists("/config.json"))
     {
         Log.Fatal("No config file found, creating dummy config.");
         CreateConfig(serializationOptions);
         Environment.Exit(1);
     }
-
+    Log.Verbose("Loading config from file.");
     var configFile = File.ReadAllText("/config.json");
     return JsonSerializer.Deserialize<Config>(configFile, serializationOptions);
 }
@@ -69,6 +95,7 @@ static void CreateConfig(JsonSerializerOptions options)
 
 static async Task ScheduleJobs(Config config, CancellationToken token)
 {
+    Log.Debug($"Scheduling job with cron expression '{config.Schedule}'");
     var schedule = CronExpression.Parse(config.Schedule);
     
     while (!token.IsCancellationRequested)
@@ -80,11 +107,12 @@ static async Task ScheduleJobs(Config config, CancellationToken token)
         
         Log.Information($"Next scheduled scan at {nextJob.Value}");
         var delay = nextJob.Value - now;
+        Log.Debug($"{delay} until next scan at {nextJob.Value}");
         if (delay > TimeSpan.Zero)
         {
             await Task.Delay(delay, token);
         }
-        
+        Log.Debug($"Delay {delay} wait is complete, beginning scan now.");
         await RunJob(config, token);
     }
 }
@@ -92,9 +120,12 @@ static async Task ScheduleJobs(Config config, CancellationToken token)
 static async Task RunJob(Config config, CancellationToken token)
 {
     using var client = GetClient(config.FTP);
+    Log.Information($"Connecting to {config.FTP.Host}:{config.FTP.Port} as {config.FTP.UserName}");
+    
     var buffer = Math.Clamp(config.BufferSizeMB ?? 1, 0.5f, 4);
     client.BufferSize = (uint)(1024 * 1024 * buffer);
-    Log.Information($"Connecting to {config.FTP.Host}:{config.FTP.Port} as {config.FTP.UserName}");
+    Log.Debug($"Connection buffer size: {client.BufferSize}");
+    
     await client.ConnectAsync(token);
     foreach (var target in config.Targets)
     {
@@ -113,11 +144,13 @@ static async Task RecurseDirectory(SftpClient client, string source, string dest
 
         if (item.IsDirectory)
         {
+            Log.Verbose($"{item.Name} is a directory");
             var newPath = Path.Combine(destination, item.Name);
             await RecurseDirectory(client, item.FullName, newPath, true, token);
             return;
         }
         
+        Log.Verbose($"{item.Name} is a file");
         await DownloadFile(client, item, destination, token);
         Log.Information($"Deleting '{item.Name}'");
         await client.DeleteAsync(item.FullName, token);
@@ -133,9 +166,11 @@ static async Task RecurseDirectory(SftpClient client, string source, string dest
 static async Task DownloadFile(SftpClient client, ISftpFile item, string destination, CancellationToken token)
 {
     Directory.CreateDirectory(destination);
+    Log.Verbose($"Ensuring '{destination}' path exists.");
     await using var stream = File.Open(Path.Combine(destination, item.Name), FileMode.Create, FileAccess.Write);
     Log.Information($"Downloading '{item.FullName}' to '{stream.Name}'");
     await client.DownloadFileAsync(item.FullName, stream, token);
+    Log.Verbose("Download completed.");
 }
 
 static SftpClient GetClient(SFtpTarget target)