/// <summary>
/// Switches the SentinelMasterConnection over to a new primary.
/// </summary>
/// <param name="switchBlame">The endpoint responsible for the switch.</param>
/// <param name="connection">The connection that should be switched over to a new primary endpoint.</param>
/// <param name="log">The writer to log to, if any.</param>
internal void SwitchPrimary(EndPoint switchBlame, ConnectionMultiplexer connection, TextWriter log = null)
{
if (log == null)
{
log = TextWriter.Null;
}
using (var logProxy = LogProxy.TryCreate(log))
{
string serviceName = connection.RawConfig.ServiceName;
// Get new primary - try twice
EndPoint newPrimaryEndPoint = GetConfiguredPrimaryForService(serviceName)
?? GetConfiguredPrimaryForService(serviceName)
?? throw new RedisConnectionException(ConnectionFailureType.UnableToConnect,
$"Sentinel: Failed connecting to switch primary for service: {serviceName}");
connection.currentSentinelPrimaryEndPoint = newPrimaryEndPoint;
if (!connection.servers.Contains(newPrimaryEndPoint))
{
EndPoint[] replicaEndPoints = GetReplicasForService(serviceName)
?? GetReplicasForService(serviceName);
connection.servers.Clear();
connection.EndPoints.Clear();
connection.EndPoints.TryAdd(newPrimaryEndPoint);
foreach (var replicaEndPoint in replicaEndPoints)
{
connection.EndPoints.TryAdd(replicaEndPoint);
}
Trace($"Switching primary to {newPrimaryEndPoint}");
// Trigger a reconfigure
connection.ReconfigureAsync(first: false, reconfigureAll: false, logProxy, switchBlame,
$"Primary switch {serviceName}", false, CommandFlags.PreferMaster).Wait();
UpdateSentinelAddressList(serviceName);
}
}
}