private async Task <InstanceRunner> ReplaceOrRestartAsync(InstanceRunner runner, IWrappedRunner prevhandler, IWrappedRunner newhandler, string newaddr, int newport, bool usessl, ServerConfig config)
{
if (newhandler == null)
{
// We are stopping the handler
if (runner != null)
{
runner.StopAsync();
}
runner = null;
}
else
{
// We are starting, or restarting the handler
if (runner == null)
{
// Just
runner = new InstanceRunner {
Wrapper = newhandler
};
await runner.RestartAsync(newaddr, newport, usessl, config);
}
else
{
// If any of these change, we need to restart the listen socket
if (runner.Address != newaddr || runner.Port != newport)
{
// Start the new instance first
var newrunner = new InstanceRunner {
Wrapper = newhandler
};
await newrunner.RestartAsync(newaddr, newport, usessl, config);
runner.StopAsync();
return(newrunner);
}
// In this case we must restart the socket, but need to stop first
else if (config.SocketBacklog != runner.Config.SocketBacklog)
{
await runner.StopAsync();
runner = new InstanceRunner();
runner.Wrapper = newhandler;
await runner.RestartAsync(newaddr, newport, usessl, config);
}
else
{
// No changes, just apply the new handler for future requests
runner.Wrapper = newhandler;
}
}
}
return(runner);
}
/// <summary>
/// Reload this instance.
/// </summary>
public async Task ReloadAsync(bool http, bool https)
{
Program.DebugConsoleOutput("Reloading instance");
var cfg = ConfigParser.ParseTextFile(m_path);
var config = ConfigParser.CreateServerConfig(cfg);
config.Storage = m_storage;
((MemoryStorageCreator)m_storage).ExpireCheckInterval = cfg.StorageExpirationCheckIntervalSeconds;
var prevhttp = m_http_runner?.Wrapper;
var prevhttps = m_https_runner?.Wrapper;
IWrappedRunner new_http_runner = null;
IWrappedRunner new_https_runner = null;
Program.DebugConsoleOutput("Creating runners");
try
{
if (http)
{
new_http_runner = CreateRunner(m_path, false, m_storage, default(System.Threading.CancellationToken));
}
if (https)
{
new_https_runner = CreateRunner(m_path, true, m_storage, default(System.Threading.CancellationToken));
}
}
catch (Exception ex)
{
Program.DebugConsoleOutput("Failed to create runners: {0}", ex);
// If we fail to start, just kill any of the instances we just started
if (new_http_runner != null)
{
try { new_http_runner.Kill(); }
catch { }
}
if (new_https_runner != null)
{
try { new_https_runner.Kill(); }
catch { }
}
throw;
}
Program.DebugConsoleOutput("Created runners, replacing existing runners");
// Set up the new instances
m_http_runner = await ReplaceOrRestartAsync(m_http_runner, prevhttp, new_http_runner, cfg.HttpAddress, cfg.HttpPort, false, config);
m_https_runner = await ReplaceOrRestartAsync(m_https_runner, prevhttps, new_https_runner, cfg.HttpsAddress, cfg.HttpsPort, true, config);
Program.DebugConsoleOutput("Stopping old runners");
if (new_https_runner == null)
{
if (m_https_runner != null)
{
m_https_runner.StopAsync();
}
}
else
{
if (m_https_runner == null)
{
m_https_runner = new InstanceRunner();
}
m_https_runner.Wrapper = new_https_runner;
}
// TODO: If the runner is reconfigured, then restart it
Program.DebugConsoleOutput("Setting up crash handlers.");
// Bind variables
var self_http = m_http_runner;
var self_https = m_https_runner;
// Set up a crash handler to capture crash in log
var dummy = self_http?.RunnerTask.ContinueWith(x =>
{
if (!self_http.ShouldStop && InstanceCrashed != null)
{
InstanceCrashed(cfg.HttpAddress, false, x.IsFaulted ? x.Exception : new Exception("Unexpected stop"));
}
});
// Set up a crash handler to capture crash in log
dummy = self_https?.RunnerTask.ContinueWith(x =>
{
if (!self_https.ShouldStop && InstanceCrashed != null)
{
InstanceCrashed(cfg.HttpsAddress, true, x.IsFaulted ? x.Exception : new Exception("Unexpected stop"));
}
});
Program.DebugConsoleOutput("Ensuring that old runners are stopped");
if (prevhttp != null || prevhttps != null)
{
await Task.Run(async() =>
{
// We need both to stop
var t = Task.WhenAll(new[] { prevhttp?.StopAsync(), prevhttps?.StopAsync() }.Where(x => x != null));
// Give old processes time to terminate (if they are handling requests)
var maxtries = cfg.MaxUnloadWaitSeconds;
while (maxtries-- > 0 && !t.IsCompleted)
{
await Task.WhenAny(t, Task.Delay(1000));
}
// If we failed to stop, request a kill
if (!t.IsCompleted)
{
Program.DebugConsoleOutput("Requesting kill of old runners");
if (prevhttp != null)
{
prevhttp.Kill();
}
if (prevhttps != null)
{
prevhttps.Kill();
}
}
});
}
Program.DebugConsoleOutput("Reloading completed");
}