/// <summary>
/// Safe entry point
/// </summary>
/// <param name="args"></param>
private static void Run(string[] args)
{
try
{
Log.LogSystem = new LogMultiplier(new FileLog(TraceLevel.Verbose), new ConsoleLog());
string? environmentName = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");
IConfigurationRoot config = new ConfigurationBuilder()
.SetBasePath(Directory.GetParent(AppContext.BaseDirectory).FullName)
.AddJsonFile("appsettings.json", true, true)
.AddJsonFile($"appsettings.{environmentName}.json", true, true)
.Build();
string connString = config.GetConnectionString("drdWebDb");
using (PgSqlDbConnect connect = new PgSqlDbConnect(connString))
{
connect.Open();
FileHelper.WriteAllBytes(Path.Combine(AppContext.BaseDirectory, "output.sql"), connect.ReadSchema());
}
}
finally
{
Log.Dispose();
}
}
/// <summary>
/// Listen database on selected channels
/// </summary>
/// <param name="stoppingToken">Cancellation</param>
/// <returns></returns>
public async Task ListenDb(CancellationToken stoppingToken)
{
await ParallelHelper.Run(() =>
{
Log.Info($"Listening started for DB: {_dbName}");
while (!stoppingToken.IsCancellationRequested)
{
try
{
using (PgSqlDbConnect connect = new PgSqlDbConnect(_connectionString))
{
connect.Open();
connect.UnderlyingConnection.Notification += OnNotification;
connect.Execute($"LISTEN {PgSqlDbConnect.CHANNEL_GENESIS_REQUEST};");
connect.Execute($"LISTEN {PgSqlDbConnect.CHANNEL_GENESIS_DELETE};");
connect.Execute($"LISTEN {PgSqlDbConnect.CHANNEL_BACKUP_REQUEST};");
while (!stoppingToken.IsCancellationRequested && connect.UnderlyingConnection.State == ConnectionState.Open)
{
connect.UnderlyingConnection.Wait(100);
}
}
}
catch (Exception e)
{
Log.Error(e);
Thread.Sleep(1000);
}
}
});
}
/// <summary>
/// Event on DB notification on listened channels occurs
/// </summary>
/// <param name="sender">Sender of event</param>
/// <param name="args">Event arguments</param>
private void OnNotification(object sender, NpgsqlNotificationEventArgs args)
{
try
{
switch (args.Channel)
{
case PgSqlDbConnect.CHANNEL_GENESIS_REQUEST:
{
if (string.IsNullOrEmpty(args.Payload))
{
throw new ArgumentException("Payload is empty");
}
string filePath = Path.Combine(_config["GenesisOutputDir"], args.Payload + ".sql");
FileHelper.DirectoryEnsure(filePath);
string exePath = _config["PgDumpPath"];
string argsText = $"{_config["GenesisArgs"]} --file=\"{filePath}\" {_dbName}";
Log.Info($"RUN {exePath} {argsText}");
Process pgsql = Process.Start(exePath, argsText);
pgsql?.WaitForExit();
using (PgSqlDbConnect connect2 = new PgSqlDbConnect(_connectionString))
{
connect2.Open();
connect2.Execute($"SELECT pg_notify('{PgSqlDbConnect.CHANNEL_GENESIS_RESPOND}', '{filePath}'::TEXT);");
}
break;
}
case PgSqlDbConnect.CHANNEL_GENESIS_DELETE:
{
File.Delete(args.Payload);
break;
}
case PgSqlDbConnect.CHANNEL_BACKUP_REQUEST:
{
string exePath = _config["PgDumpAllPath"];
string filePath = Path.Combine(_config["BackupOutputDir"],
_config["BackupFilePrefix"] + DateTimeHelper.Now.ToString(DateTimeHelper.FORMAT_FULL).Replace(".", "_").Replace(":", "_").Replace(" ", "_") + ".pgbak");
string argsText = $"{_config["BackupArgs"]} --file=\"{filePath}\"";
Log.Info($"RUN {exePath} {argsText}");
Process pgsql = Process.Start(exePath, argsText);
pgsql?.WaitForExit();
break;
}
}
}
catch (Exception ex)
{
Log.Error(ex, $"{args.Channel} [{args.Payload}]");
}
}
/// <summary>
/// Execution of a service
/// </summary>
/// <param name="cancellationToken">Cancellation</param>
/// <returns></returns>
protected override async Task ExecuteAsync(CancellationToken cancellationToken)
{
Log.Info("PGenesisWorker.Execute!");
await ParallelHelper.Run(() =>
{
string defaultDbName = _config["PgDefaultDb"];
Log.Info($"Default DB name: {defaultDbName}");
string connString = GetConnectionString(defaultDbName);
List <string> databases = new List <string>();
using (PgSqlDbConnect connect = new PgSqlDbConnect(connString))
{
connect.Open();
using (PgSqlDataReader reader = connect.GetDataReader("SELECT datname FROM pg_database WHERE datistemplate = false AND datname != 'postgres';"))
{
while (reader.UnderlyingReader.Read())
{
databases.Add(reader.ReadString("datname"));
}
}
}
List <Task> allTasks = new List <Task>();
foreach (string fDbName in databases)
{
PGenesisListener fListener = new PGenesisListener(_config, fDbName, GetConnectionString(fDbName));
Task fTask = fListener.ListenDb(cancellationToken);
allTasks.Add(fTask);
}
while (!cancellationToken.IsCancellationRequested)
{
Task.WaitAll(allTasks.ToArray(), 100);
}
Log.Info("PGenesisWorker.Execute finished!");
});
}
