static async Task DoSample() { EtcdClientOpitions options = new EtcdClientOpitions() { Urls = new string[] { "https://etcd0.em", "https://etcd1.em", "https://etcd2.em" }, Username = "******", Password = "******", UseProxy = false, IgnoreCertificateError = true, // If the ectd server is running with self-signed SSL certificate and we can ignore the SSL error //X509Certificate = new X509Certificate2(@"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(); } } }
static async void WatchChanges(EtcdClient etcdClient, string key) { long waitIndex = etcdClient.LastIndex; for (; ; ) { try { EtcdResponse resp = await etcdClient.WatchNodeAsync(key, recursive: true, waitIndex: waitIndex); if (resp != null && resp.Node != null) { if( string.Equals( resp.Action, EtcdResponse.ACTION_EXPIRE) ) Console.WriteLine("`{0}` is expired", resp.Node.Key); waitIndex = resp.Node.ModifiedIndex + 1; } continue; } catch(EtcdException.EventIndexCleared) { waitIndex = etcdClient.LastIndex; } catch(EtcdException.WatcherCleared) { waitIndex = etcdClient.LastIndex; } catch(Exception ex) { int indentation = 0; while (ex != null) { if (!(ex is AggregateException)) { Console.WriteLine("{0} {1} : {2}", string.Empty.PadLeft(indentation), ex.GetType().Name, ex.Message); } indentation += 2; ex = ex.InnerException; } } // if something went wrong, wait for 1 second and try again await Task.Delay(1000); } }