public virtual bool TestWebProxy(IActualProxy actualProxy)
{
// get test url specified in application config file
// (not in the settings file because this information is supposed to be set for site)
string targetUrl = SystemSettingsSwitcher.GetProxyTestUrl();
Debug.Assert(string.IsNullOrEmpty(targetUrl) == false);
Uri target = new Uri(targetUrl);
DnsEndPoint targetEndPoint = new DnsEndPoint(target.Host, target.Port);
WebClientForTest webClient = new WebClientForTest();
webClient.Timeout = 10 * 1000; // 10 seconds
// test each proxy candidate
CommandBase owner = this.Owner;
bool result = false;
IReadOnlyCollection <DnsEndPoint> endPoints = actualProxy.GetProxyEndPoints(target);
if (endPoints != null)
{
foreach (DnsEndPoint endPoint in endPoints)
{
owner.LogVerbose($"ActualProxy check: to {endPoint.Host}:{endPoint.Port}");
try {
webClient.Proxy = new WebProxy(endPoint.Host, endPoint.Port);
webClient.DownloadData(targetUrl); // an exception is thrown on error
result = true;
} catch (WebException exception) {
// Note that a protocol error indicates that the end point exists
result = (exception.Status == WebExceptionStatus.ProtocolError);
if (result)
{
owner.LogVerbose($"ActualProxy check: {exception.Status} -> OK");
}
else
{
owner.LogError($"ActualProxy check: {exception.Status} -> NG");
}
}
if (result)
{
// a valid proxy is found
break;
}
}
}
if (result)
{
owner.LogVerbose("ActualProxy check: OK - there is a valid actual proxy.");
}
else
{
owner.LogError("ActualProxy check: NG - no valid proxy.");
}
return(result);
}
public bool Test(CommandSettings settings, string targetUrl)
{
SystemSettingsSwitcherSettings systemSettingsSwitcherSettings = settings.SystemSettingsSwitcher;
bool backup = systemSettingsSwitcherSettings.EnableSystemSettingsSwitch;
string logLevelLog = string.Empty;
TraceLevel backupLogLevel = Logger.LogLevel;
TraceLevel tempLogLevel = backupLogLevel;
if (tempLogLevel < TraceLevel.Info)
{
tempLogLevel = TraceLevel.Info;
logLevelLog = $" The LogLevel is changed to '{tempLogLevel}' temporarily.";
}
// test suppressing system settings switch
try {
LogStart($"Start a test connection to '{targetUrl}'.{logLevelLog}");
Logger.LogLevel = tempLogLevel;
systemSettingsSwitcherSettings.EnableSystemSettingsSwitch = false;
using (RunningProxyState proxyState = StartProxy(settings, saveCredentials: false, checkPreviousBackup: false)) {
// In SystemSettingsSwitcher.TestWebProxy() called from StartProxy() above,
// MAPE already tested connectivity to the targetUrl with the actual proxy.
// In this test, on the other hand, connectivity is tested with the MAPE main listener as the proxy.
IPEndPoint proxyEndPoint = ListenerSettings.GetEndPoint(settings.Proxy.MainListener);
WebClientForTest webClient = new WebClientForTest();
webClient.Timeout = 180 * 1000; // 3 minutes
webClient.Proxy = new WebProxy(proxyEndPoint.Address.ToString(), proxyEndPoint.Port);
webClient.DownloadData(targetUrl); // an exception is thrown on error
// wait for stop for 3 seconds
proxyState.Stop(systemSessionEnding: false, millisecondsTimeout: 3000);
}
} finally {
systemSettingsSwitcherSettings.EnableSystemSettingsSwitch = backup;
Logger.LogLevel = backupLogLevel;
LogStop($"Stop the test connection.");
}
return(true);
}