public async Task DeleteResourceAsync(string group, string resourceName)
{
while (true)
{
try
{
var childrenRes = await zookeeper.getChildrenAsync($"{zkRootPath}/{group}/resources/{resourceName}");
foreach (var child in childrenRes.Children)
{
await SafeDelete($"{zkRootPath}/{group}/resources/{resourceName}/{child}");
}
await SafeDelete($"{zkRootPath}/{group}/resources/{resourceName}");
return;
}
catch (KeeperException.NoNodeException)
{
return;
}
catch (KeeperException.ConnectionLossException)
{
}
catch (KeeperException.SessionExpiredException)
{
await EstablishSession();
}
}
}
private async Task LoadNode(org.apache.zookeeper.ZooKeeper zk, Node node)
{
var result = await zk.getChildrenAsync(node.Path);
if (result != null)
{
node.NodeState = NodeState.Build(result.Stat);
foreach (var child in result.Children)
{
var childNode = new Node
{
Text = child
};
if (node.Path != "/")
{
childNode.Path = node.Path + "/" + child;
}
else
{
childNode.Path = node.Path + child;
}
await LoadNode(zk, childNode);
if (node.Nodes == null)
{
node.Nodes = new List <Node>();
}
node.Nodes.Add(childNode);
}
}
}
protected static void EnsureChildrenExists(org.apache.zookeeper.ZooKeeper client, string rootNode, string[] children)
{
var getChildrenResult = client.getChildrenAsync(rootNode).GetAwaiter().GetResult();
getChildrenResult.Children.Should().BeEquivalentTo(children);
//getChildrenResult.EnsureSuccess();
//getChildrenResult.Status.Should().Be(ZooKeeperStatus.Ok);
//getChildrenResult.Path.Should().Be(rootNode);
//getChildrenResult.Payload.Should().BeEquivalentTo(children);
}
protected static void EnsureChildrenExistWithCorrectStat(org.apache.zookeeper.ZooKeeper client, string rootNode, string[] children, int nodeVersion = 0, int childVersion = 0)
{
var getChildrenWithStatResult = client.getChildrenAsync(rootNode).GetAwaiter().GetResult();
getChildrenWithStatResult.Children.Should().BeEquivalentTo(children);
//getChildrenWithStatResult.Path.Should().Be(rootNode);
//getChildrenWithStatResult.Status.Should().Be(ZooKeeperStatus.Ok);
//getChildrenWithStatResult.Payload.Item1.Should().BeEquivalentTo(children);
//getChildrenWithStatResult.Payload.Item2.Version.Should().Be(nodeVersion);
//getChildrenWithStatResult.Payload.Item2.Cversion.Should().Be(childVersion);
}
public async Task Lock(string lockNode)
{
var node = $"{config.LockPath}/${lockNode}";
await this.CreatNodeIfNotExist(node);
var path = $"{config.LockPath}/${lockNode}/${config.Name}-";
this.nodePath = await zooKeeper.createAsync(
path,
this.config.Name.ToBytes(),
this.acls,
ZK.CreateMode.EPHEMERAL_SEQUENTIAL);
var index = nodePath.GetIndex();
var children = await zooKeeper.getChildrenAsync(node);
var childrenIndex = children.Children.Select(p => new { Node = p, Index = p.GetIndex() }).OrderBy(p => p.Index).ToList();
if (childrenIndex.First().Index == index)
{
Console.WriteLine($"{this.config.Name} Begin Lock");
return;
}
var targetNode = string.Empty;
for (int i = 0; i < childrenIndex.Count; i++)
{
if (childrenIndex[i].Index == index)
{
targetNode = childrenIndex[i - 1].Node;
break;
}
}
if (string.IsNullOrEmpty(targetNode))
{
throw new Exception("Node Get Error");
}
var tcs = new TaskCompletionSource <bool>();
Console.WriteLine($"{this.config.Name} Wait for {node}/{targetNode}");
var waitNode = await zooKeeper.existsAsync(
$"{node}/{targetNode}",
new WaitWatcher($"{node}/{targetNode}", tcs, e => e.get_Type() == EventType.NodeDeleted || e.getState() == KeeperState.Disconnected));
if (waitNode != null)
{
await Task.WhenAny(Task.Delay(Timeout.Infinite), tcs.Task);
}
Console.WriteLine($"{this.config.Name} Begin Lock");
return;
}
public static async Task DeleteRecursive(org.apache.zookeeper.ZooKeeper zk, string path = "", string key = "")
{
try
{
var correctedPath = path + "/" + key;
var a = await zk.getChildrenAsync(correctedPath);
foreach (var child in a.Children)
{
await DeleteRecursive(zk, correctedPath == "/"? "" : correctedPath, child);
}
await zk.deleteAsync(correctedPath);
}
catch (KeeperException.NoNodeException) { }
}
/// <summary>
/// //
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public async Task <bool> GetLock(string key)
{
var node = await _zooKeeper.createAsync($"/PessimisticLockV2/LOCK", Encoding.UTF8.GetBytes("1"),
ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT_SEQUENTIAL);
var children = await _zooKeeper.getChildrenAsync("/PessimisticLockV2");
var minNode = children.Children.OrderBy(t => t).First();
var res = ("/PessimisticLockV2/" + minNode).Equals(node);
if (res)
{
await _zooKeeper.deleteAsync(node);//releaseLock
return(true);
}
return(false);
}
public async Task <IActionResult> List()
{
var list = new List <Connection>();
var connResult = await _zooKeeper.getChildrenAsync("/connections");
foreach (var conn in connResult.Children)
{
var connData = await _zooKeeper.getDataAsync($"/connections/{conn}/value");
var connStr = Encoding.UTF8.GetString(connData.Data);
var item = new Connection
{
Id = conn,
Value = connStr
};
list.Add(item);
}
return(Ok(list));
}
public async Task RefreshAsync()
{
var connDic = new Dictionary <string, string>();
var isExisted = await _zooKeeper.existsAsync("/connections");
if (isExisted == null)
{
await _zooKeeper.createAsync("/connections", null, ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
}
var connResult = await _zooKeeper.getChildrenAsync("/connections", new ConnectionWatcher(this));
foreach (var conn in connResult.Children)
{
var connData = await _zooKeeper.getDataAsync($"/connections/{conn}/value");
var connStr = Encoding.UTF8.GetString(connData.Data);
connDic[conn] = connStr;
}
_cache.Set("connections", connDic);
}
public async Task <ClientsZnode> GetActiveClientsAsync()
{
string actionToPerform = "get the list of active clients";
while (true)
{
await BlockUntilConnected(actionToPerform);
try
{
ChildrenResult childrenResult = await zookeeper.getChildrenAsync(clientsPath);
List <string> childrenPaths = childrenResult.Children.Select(x => $"{clientsPath}/{x}").ToList();
return(new ClientsZnode {
Version = childrenResult.Stat.getVersion(), ClientPaths = childrenPaths
});
}
catch (KeeperException.NoNodeException e)
{
throw new ZkInvalidOperationException(
$"Could not {actionToPerform} as the clients node does not exist.", e);
}
catch (KeeperException.ConnectionLossException)
{
// do nothing, the next iteration will try again
}
catch (KeeperException.SessionExpiredException e)
{
throw new ZkSessionExpiredException($"Could not {actionToPerform} as the session has expired: ", e);
}
catch (Exception e)
{
throw new ZkInvalidOperationException($"Could not {actionToPerform} due to an unexpected error", e);
}
}
}
public async Task <List <string> > GetChildrenAsync(string path, bool watch)
{
return((await _zooKeeper.getChildrenAsync(path, watch)).Children);
}
/// <summary>
/// 获取锁
/// </summary>
/// <param name="millisecondsTimeout">等待时间</param>
/// <returns></returns>
public async Task <bool> TryLock(int millisecondsTimeout = 0)
{
try
{
zooKeeper = new org.apache.zookeeper.ZooKeeper("127.0.0.1", 50000, new MyWatcher());
//创建锁节点
if (await zooKeeper.existsAsync("/Locks") == null)
{
await zooKeeper.createAsync("/Locks", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
}
//新建一个临时锁节点
lockNode = await zooKeeper.createAsync("/Locks/Lock_", null, Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL_SEQUENTIAL);
//获取锁下所有节点
var lockNodes = await zooKeeper.getChildrenAsync("/Locks");
lockNodes.Children.Sort();
//判断如果创建的节点就是最小节点 返回锁
if (lockNode.Split("/").Last() == lockNodes.Children[0])
{
return(true);
}
else
{
//当前节点的位置
var location = lockNodes.Children.FindIndex(n => n == lockNode.Split("/").Last());
//获取当前节点 前面一个节点的路径
var frontNodePath = lockNodes.Children[location - 1];
//在前面一个节点上加上Watcher ，当前面那个节点删除时，会触发Process方法
await zooKeeper.getDataAsync("/Locks/" + frontNodePath, myWatcher);
//如果时间为0 一直等待下去
if (millisecondsTimeout == 0)
{
myWatcher.AutoResetEvent.WaitOne();
}
else //如果时间不为0 等待指定时间后，返回结果
{
var result = myWatcher.AutoResetEvent.WaitOne(millisecondsTimeout);
if (result)//如果返回True，说明在指定时间内，前面的节点释放了锁(但是)
{
//获取锁下所有节点
lockNodes = await zooKeeper.getChildrenAsync("/Locks");
//判断如果创建的节点就是最小节点 返回锁
if (lockNode.Split("/").Last() == lockNodes.Children[0])
{
return(true);
}
else
{
return(false);
}
}
else
{
return(false);
}
}
}
}
catch (KeeperException e)
{
await UnLock();
throw e;
}
return(false);
}
