/// <summary>
/// 更新该节点上线状态
/// </summary>
/// <returns></returns>
private static async Task UpdateOnlineState()
{
if (m_client != null)
{
string path = $"/Client/{m_ClientName}";
await m_client.SetNodeAsync(path, "OnLine");
}
}
public void OnStart(IEnumerable <ServerPort> serverPorts, IEnumerable <IGrpcServerService> servicesStarted)
{
// Register each service that started with etcd using the host IP setting
var registerTasks = new List <Task>();
foreach (IGrpcServerService service in servicesStarted)
{
var t = _client.SetNodeAsync(GetServiceKey(service), $"{_broadcastOptions.IP}:{_broadcastOptions.Port}");
registerTasks.Add(t);
}
Task.WaitAll(registerTasks.ToArray());
}
private async Task <Task> PhoneHome(CancellationToken ct)
{
// Register
try
{
await etcdClient.SetNodeAsync("/_etcd/registry/github", "{\"name\": \"GitHub\", \"type\": \"Issue Tracker\"}");
Log.Information("ETCD Registration Complete!");
}
catch (EtcdGenericException ex)
{
Log.Error("Error registering service with ETCD registry: ", ex.Message);
}
// Heartbeat
return(Task.Factory.StartNew(async() =>
{
const string KEY = "/heartbeat/github";
const string VAL = "1";
const int TTL = 10;
while (!ct.IsCancellationRequested)
{
Log.Information("Heartbeat ...");
try
{
await etcdClient.SetNodeAsync(KEY, VAL, ttl: TTL);
}
catch (EtcdGenericException ex)
{
Log.Error("Error sending heartbeat to ETCD registry: ", ex.Message);
}
await Task.Delay(TTL / 2 * 1000);
}
}, ct));
}
static async Task DoSample()
{
EtcdClientOpitions options = new EtcdClientOpitions()
{
#if NET45 // TODO: This is optional, having HTTPS setup could make this work in .NET Core as well, but it's not tested for now
Urls = new string[] { "https://etcd0.em", "https://etcd1.em", "https://etcd2.em" },
#else
Urls = new string[] { "http://*****:*****@"client.p12"), // client cerificate
JsonDeserializer = new NewtonsoftJsonDeserializer(),
};
EtcdClient etcdClient = new EtcdClient(options);
string key = "/my/key";
string value;
// query the value of the node using GetNodeValueAsync
try {
value = await etcdClient.GetNodeValueAsync(key);
Console.WriteLine("The value of `{0}` is `{1}`", key, value);
}
catch (EtcdCommonException.KeyNotFound) {
Console.WriteLine("Key `{0}` does not exist", key);
}
// update the value using SetNodeAsync
EtcdResponse resp = await etcdClient.SetNodeAsync(key, "some value");
Console.WriteLine("Key `{0}` is changed, modifiedIndex={1}", key, resp.Node.ModifiedIndex);
// query the node using GetNodeAsync
resp = await etcdClient.GetNodeAsync(key, ignoreKeyNotFoundException : true);
if (resp == null || resp.Node == null)
{
Console.WriteLine("Key `{0}` does not exist", key);
}
else
{
Console.WriteLine("The value of `{0}` is `{1}`", key, resp.Node.Value);
}
//////////////////////////////////////////////////////////
List <Task <EtcdResponse> > tasks = new List <Task <EtcdResponse> >();
key = "/in-order-queue";
// start monitoring the expire event
WatchChanges(etcdClient, key);
// create 5 in-order nodes, TTL = 3 second
for (int i = 0; i < 5; i++)
{
tasks.Add(etcdClient.CreateInOrderNodeAsync(key, i.ToString(), ttl: 3));
}
await Task.WhenAll(tasks);
// list the in-order nodes
resp = await etcdClient.GetNodeAsync(key, false, recursive : true, sorted : true);
if (resp.Node.Nodes != null)
{
foreach (var node in resp.Node.Nodes)
{
Console.WriteLine("`{0}` = {1}", node.Key, node.Value);
}
}
/////////////////////////////////////////////////////////////
key = "/my/cas-test";
value = Guid.NewGuid().ToString();
try {
resp = await etcdClient.CreateNodeAsync(key, value, null, dir : false);
Console.WriteLine("Key `{0}` is created with value {1}", key, value);
}
catch (EtcdCommonException.NodeExist) {
Console.WriteLine("Key `{0}` already exists", key);
}
long prevIndex = 1;
try {
resp = await etcdClient.CompareAndSwapNodeAsync(key, value, "new value");
Console.WriteLine("Key `{0}` is updated to `{1}`", key, resp.Node.Value);
prevIndex = resp.Node.ModifiedIndex;
}
catch (EtcdCommonException.KeyNotFound) {
Console.WriteLine("Key `{0}` does not exists", key);
}
catch (EtcdCommonException.TestFailed) {
Console.WriteLine("Key `{0}` can not be updated because the supplied previous value is incorrect", key);
}
try {
resp = await etcdClient.CompareAndSwapNodeAsync(key, prevIndex, "new value2");
Console.WriteLine("Key `{0}` is updated to `{1}`", key, resp.Node.Value);
}
catch (EtcdCommonException.KeyNotFound) {
Console.WriteLine("Key `{0}` does not exists", key);
}
catch (EtcdCommonException.TestFailed) {
Console.WriteLine("Key `{0}` can not be updated because the supplied previous index is incorrect", key);
}
try {
resp = await etcdClient.CompareAndDeleteNodeAsync(key, prevIndex + 1);
Console.WriteLine("Key `{0}` is deleted", key);
}
catch (EtcdCommonException.KeyNotFound) {
Console.WriteLine("Key `{0}` does not exists", key);
}
catch (EtcdCommonException.TestFailed) {
Console.WriteLine("Key `{0}` can not be deleted because the supplied previous index is incorrect", key);
}
if (prevIndex == 1) // the previous CAS failed
{
try {
resp = await etcdClient.CompareAndDeleteNodeAsync(key, "new value2");
Console.WriteLine("Key `{0}` is deleted", key);
}
catch (EtcdCommonException.KeyNotFound) {
Console.WriteLine("Key `{0}` does not exists", key);
}
catch (EtcdCommonException.TestFailed) {
Console.WriteLine("Key `{0}` can not be deleted because the supplied previous value is incorrect", key);
etcdClient.DeleteNodeAsync(key, ignoreKeyNotFoundException: true).Wait();
}
}
}
public void Put(string id, T value)
{
etcdClient.SetNodeAsync(CreateKey(id), ToDataRecord(value)).Wait();
}