private async Task GetZkLockAsync(CanalClientRunningInfo runningInfo, bool waiting = false)
{
var times = 0;
while (waiting && times < 60)
{
await Task.Delay(1000);
times++;
_logger.LogWarning($"Waiting for get lock {times}-60...");
}
if (await _zk.NodeExistsAsync(ZK_CLIENT_RUNNING_NODE))
{
_logger.LogInformation($"Node {ZK_CLIENT_RUNNING_NODE} exits, get Zookeeper lock failed. Other instances are running.");
_logger.LogWarning("Waiting...");
}
else
{
try
{
var clientNodeData = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(runningInfo));
var parentNode = ZK_CLIENT_RUNNING_NODE.Replace("/running", "");
if (!await _zk.NodeExistsAsync(parentNode))
{
await _zk.CreateNodeAsync(parentNode, null,
new List <Acl>() { new Acl(AclPerm.All, AclScheme.World, AclId.World()) }, NodeType.Persistent);
}
await _zk.CreateNodeAsync(ZK_CLIENT_RUNNING_NODE, clientNodeData,
new List <Acl>() { new Acl(AclPerm.All, AclScheme.World, AclId.World()) }, NodeType.Ephemeral);
await _zk.CreateNodeAsync(parentNode + "/" + runningInfo.Address, null,
new List <Acl>() { new Acl(AclPerm.All, AclScheme.World, AclId.World()) }, NodeType.Ephemeral);
await _zk.NodeExistsAsync(ZK_CLIENT_RUNNING_NODE);
_completionSource.SetResult(0);
_logger.LogInformation("Get zookeeper lock success.");
}
catch (KeeperException.NodeExistsException e)
{
if (e.getPath() != ZK_CLIENT_RUNNING_NODE)
{
_logger.LogError(e, "Error during get lock.");
Environment.Exit(-1);
}
_logger.LogInformation(
$"Node {ZK_CLIENT_RUNNING_NODE} exits, get Zookeeper lock failed. Other instances are running.");
_logger.LogWarning("Waiting...");
}
catch (Exception e)
{
_logger.LogError(e, "Exception in lock");
}
}
}
public Acl(AclPerm perm, AclScheme scheme, AclId id)
{
Perm = perm;
Scheme = scheme;
Id = id;
}
static async Task Main(string[] args)
{
using var loggerFactory = LoggerFactory.Create(builder =>
{
builder
.AddFilter("Microsoft", LogLevel.Debug)
.AddFilter("System", LogLevel.Information)
.AddConsole();
});
var logger = loggerFactory.CreateLogger <ZkConnection>();
var zk = new ZkConnection(new ZkConnectionOptions()
{
ConnectionString = "localhost:2181", SessionTimeout = 5000
}, logger);
zk.OnWatch += Zk_OnWatch;
await zk.ConnectAsync();
while (true)
{
await zk.CreateNodeAsync("/mynode", "ab",
new List <Acl>() { new Acl(AclPerm.All, AclScheme.World, AclId.World()) }, NodeType.Ephemeral);
await zk.SetDataAsync("/mynode", "111");
await zk.GetChildrenAsync("/mynode");
await Task.Delay(1000);
await zk.DeleteNodeAsync("/mynode");
}
}
