public async Task <IDatabase> GetDatabaseAsync(int dbNumber = 0,
bool allowAdmin = false)
{
if (!_probeComplete)
{
_probeComplete = await Probe();
}
if (dbNumber < 0 || dbNumber > _maxDb)
{
throw new IndexOutOfRangeException(
$"DB number must be 0 to {_maxDb}.");
}
RedisConnector rc = new RedisConnector(_configurationOptions,
allowAdmin);
return(rc.Connection.GetDatabase(dbNumber));
}
async Task <bool> Probe()
{
ConfigurationOptions configDB0 = _configurationOptions.Clone();
configDB0.DefaultDatabase = 0;
RedisConnector connectorDB0 = null;
try
{
connectorDB0 = new RedisConnector(configDB0, true);
}
catch (Exception ex)
{
throw new RedisHelperException(
"Cannot create DbConnection.", ex);
}
IDatabase db0 = null;
try
{
db0 = connectorDB0.Connection.GetDatabase(0);
}
catch (Exception ex)
{
throw new RedisHelperException("Cannot GetDatabase(0).", ex);
}
TimeSpan pingDuration = default(TimeSpan);
try
{
pingDuration = await db0.PingAsync();
}
catch (Exception ex)
{
throw new RedisHelperException("Cannot ping db0.", ex);
}
try
{
_server = connectorDB0.Connection.GetServer(
configDB0.EndPoints[0]);
_features = _server.Features;
}
catch (Exception ex)
{
throw new RedisHelperException(
"Cannot get server features.", ex);
}
try
{
IGrouping <string, KeyValuePair <string, string> >[] info =
await _server.InfoAsync("Server");
if (info[0].Key.Equals("Server",
StringComparison.CurrentCultureIgnoreCase))
{
foreach (KeyValuePair <string, string> kvp in info[0])
{
if (kvp.Key.Equals("redis_version",
StringComparison.CurrentCultureIgnoreCase))
{
_version = kvp.Value;
break;
}
}
}
}
catch (Exception ex)
{
throw new RedisHelperException(
"Cannot get redis_version.", ex);
}
sbyte maxDb = 0;
do
{
try
{
IDatabase nxtDb = connectorDB0
.Connection.GetDatabase(maxDb);
RedisResult rr = await nxtDb.ExecuteAsync("PING");
if (rr == null || rr.IsNull ||
!rr.ToString().Equals(
"PONG", StringComparison.CurrentCultureIgnoreCase))
{
break;
}
++maxDb;
}
catch
{
// expected... swallow
break;
}
} while (maxDb < sbyte.MaxValue);
_maxDb = maxDb;
return(true);
}
