/// <summary>
/// Constructor
/// </summary>
/// <param name="options">options to initialize</param>
public EtcdClient(EtcdClientOpitions options)
{
if (options == null)
throw new ArgumentNullException("options");
if (options.Urls == null || options.Urls.Length == 0)
throw new ArgumentException("`EtcdClientOpitions.Urls` does not contain valid url");
WebRequestHandler handler = new WebRequestHandler()
{
UseProxy = options.UseProxy,
AllowAutoRedirect = false,
AllowPipelining = true,
CachePolicy = new HttpRequestCachePolicy(HttpRequestCacheLevel.NoCacheNoStore),
};
if (options.X509Certificate != null)
handler.ClientCertificates.Add(options.X509Certificate);
AuthenticationHeaderValue authenticationHeaderValue = null;
if( !string.IsNullOrWhiteSpace(options.Username) &&
!string.IsNullOrWhiteSpace(options.Password) )
{
string auth = string.Format("{0}:{1}", options.Username, options.Password);
authenticationHeaderValue = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes(auth)));
}
_jsonDeserializer = options.JsonDeserializer == null ? new DefaultJsonDeserializer() : options.JsonDeserializer;
if (options.IgnoreCertificateError)
handler.ServerCertificateValidationCallback = (sender, certificate, chain, sslPolicyErrors) => { return true; };
HttpClientEx [] httpClients = options.Urls.Select(u =>
{
if (string.IsNullOrWhiteSpace(u))
throw new ArgumentNullException("`urls` array contains empty url");
HttpClientEx httpClient = new HttpClientEx(handler);
httpClient.BaseAddress = new Uri(u);
httpClient.DefaultRequestHeaders.Authorization = authenticationHeaderValue;
return httpClient;
}).ToArray();
// make the clients as a ring, so that we can try the next one when one fails
if( httpClients.Length > 1 )
{
for( int i = httpClients.Length - 2; i >= 0; i--)
{
httpClients[i].Next = httpClients[i + 1];
}
}
httpClients[httpClients.Length - 1].Next = httpClients[0];
// pick a client randomly
_currentClient = httpClients[DateTime.UtcNow.Ticks % httpClients.Length];
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="options">options to initialize</param>
public EtcdClient(EtcdClientOpitions options)
{
if (options == null)
{
throw new ArgumentNullException("options");
}
if (options.Urls == null || options.Urls.Length == 0)
{
throw new ArgumentException("`EtcdClientOpitions.Urls` does not contain valid url");
}
#if NET45
WebRequestHandler handler = new WebRequestHandler()
{
UseProxy = options.UseProxy,
AllowAutoRedirect = false,
AllowPipelining = true,
CachePolicy = new HttpRequestCachePolicy(HttpRequestCacheLevel.NoCacheNoStore),
};
if (options.X509Certificate != null)
{
handler.ClientCertificates.Add(options.X509Certificate);
}
#endif
AuthenticationHeaderValue authenticationHeaderValue = null;
if (!string.IsNullOrWhiteSpace(options.Username) &&
!string.IsNullOrWhiteSpace(options.Password))
{
string auth = string.Format("{0}:{1}", options.Username, options.Password);
authenticationHeaderValue = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes(auth)));
}
_jsonDeserializer = options.JsonDeserializer == null ? new DefaultJsonDeserializer() : options.JsonDeserializer;
#if NET45
if (options.IgnoreCertificateError)
{
handler.ServerCertificateValidationCallback = (sender, certificate, chain, sslPolicyErrors) => { return(true); }
}
;
#endif
HttpClientEx [] httpClients = options.Urls.Select(u =>
{
if (string.IsNullOrWhiteSpace(u))
{
throw new ArgumentNullException("`urls` array contains empty url");
}
#if NET45
HttpClientEx httpClient = new HttpClientEx(handler);
#else
HttpClientEx httpClient = new HttpClientEx();
#endif
httpClient.BaseAddress = new Uri(u);
httpClient.DefaultRequestHeaders.Authorization = authenticationHeaderValue;
return(httpClient);
}).ToArray();
// make the clients as a ring, so that we can try the next one when one fails
if (httpClients.Length > 1)
{
for (int i = httpClients.Length - 2; i >= 0; i--)
{
httpClients[i].Next = httpClients[i + 1];
}
}
httpClients[httpClients.Length - 1].Next = httpClients[0];
// pick a client randomly
_currentClient = httpClients[DateTime.UtcNow.Ticks % httpClients.Length];
}
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();
}
}
}