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Diffstat (limited to 'lib/VNLib.Plugins.Extensions.VNCache/src/VnCacheClient.cs')
| -rw-r--r-- | lib/VNLib.Plugins.Extensions.VNCache/src/VnCacheClient.cs | 231 |
1 files changed, 0 insertions, 231 deletions
diff --git a/lib/VNLib.Plugins.Extensions.VNCache/src/VnCacheClient.cs b/lib/VNLib.Plugins.Extensions.VNCache/src/VnCacheClient.cs deleted file mode 100644 index a34e611..0000000 --- a/lib/VNLib.Plugins.Extensions.VNCache/src/VnCacheClient.cs +++ /dev/null @@ -1,231 +0,0 @@ -/* -* Copyright (c) 2022 Vaughn Nugent -* -* Library: VNLib -* Package: VNLib.Plugins.Extensions.VNCache -* File: VnCacheClient.cs -* -* VnCacheClient.cs is part of VNLib.Plugins.Extensions.VNCache which is part of the larger -* VNLib collection of libraries and utilities. -* -* VNLib.Plugins.Extensions.VNCache is free software: you can redistribute it and/or modify -* it under the terms of the GNU Affero General Public License as -* published by the Free Software Foundation, either version 3 of the -* License, or (at your option) any later version. -* -* VNLib.Plugins.Extensions.VNCache is distributed in the hope that it will be useful, -* but WITHOUT ANY WARRANTY; without even the implied warranty of -* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -* GNU Affero General Public License for more details. -* -* You should have received a copy of the GNU Affero General Public License -* along with this program. If not, see https://www.gnu.org/licenses/. -*/ - -using System.Text.Json; -using System.Net.Sockets; -using System.Net.WebSockets; -using System.Security.Cryptography; - -using VNLib.Utils; -using VNLib.Utils.Memory; -using VNLib.Utils.Logging; -using VNLib.Utils.Extensions; -using VNLib.Hashing.IdentityUtility; -using VNLib.Data.Caching; -using VNLib.Data.Caching.Extensions; -using VNLib.Net.Messaging.FBM.Client; -using VNLib.Plugins.Extensions.Loading; - - -namespace VNLib.Plugins.Extensions.VNCache -{ - /// <summary> - /// A wrapper to simplify a shared global cache client - /// </summary> - [ConfigurationName("vncache")] - public sealed class VnCacheClient : VnDisposeable, IGlobalCacheProvider - { - FBMClient? _client; - - private TimeSpan RetryInterval; - - private readonly ILogProvider? DebugLog; - private readonly IUnmangedHeap? ClientHeap; - - /// <summary> - /// Initializes an emtpy client wrapper that still requires - /// configuration loading - /// </summary> - /// <param name="debugLog">An optional debugging log</param> - /// <param name="heap">An optional <see cref="IUnmangedHeap"/> for <see cref="FBMClient"/> buffers</param> - internal VnCacheClient(ILogProvider? debugLog, IUnmangedHeap? heap = null) - { - DebugLog = debugLog; - //Default to 10 seconds - RetryInterval = TimeSpan.FromSeconds(10); - - ClientHeap = heap; - } - - ///<inheritdoc/> - protected override void Free() - { - _client?.Dispose(); - _client = null; - } - - - /// <summary> - /// Loads required configuration variables from the config store and - /// intializes the interal client - /// </summary> - /// <param name="pbase"></param> - /// <param name="config">A dictionary of configuration varables</param> - /// <exception cref="KeyNotFoundException"></exception> - internal async Task LoadConfigAsync(PluginBase pbase, IReadOnlyDictionary<string, JsonElement> config) - { - int maxMessageSize = config["max_message_size"].GetInt32(); - string? brokerAddress = config["broker_address"].GetString() ?? throw new KeyNotFoundException("Missing required configuration variable broker_address"); - - //Get keys async - Task<ReadOnlyJsonWebKey?> clientPrivTask = pbase.TryGetSecretAsync("client_private_key").ToJsonWebKey(); - Task<ReadOnlyJsonWebKey?> brokerPubTask = pbase.TryGetSecretAsync("broker_public_key").ToJsonWebKey(); - Task<ReadOnlyJsonWebKey?> cachePubTask = pbase.TryGetSecretAsync("cache_public_key").ToJsonWebKey(); - - //Wait for all tasks to complete - _ = await Task.WhenAll(clientPrivTask, brokerPubTask, cachePubTask); - - ReadOnlyJsonWebKey clientPriv = await clientPrivTask ?? throw new KeyNotFoundException("Missing required secret client_private_key"); - ReadOnlyJsonWebKey brokerPub = await brokerPubTask ?? throw new KeyNotFoundException("Missing required secret broker_public_key"); - ReadOnlyJsonWebKey cachePub = await cachePubTask ?? throw new KeyNotFoundException("Missing required secret cache_public_key"); - - RetryInterval = config["retry_interval_sec"].GetTimeSpan(TimeParseType.Seconds); - - Uri brokerUri = new(brokerAddress); - - //Init the client with default settings - FBMClientConfig conf = FBMDataCacheExtensions.GetDefaultConfig(ClientHeap ?? Memory.Shared, maxMessageSize, DebugLog); - - _client = new(conf); - - //Add the configuration to the client - _client.GetCacheConfiguration() - .WithBroker(brokerUri) - .WithVerificationKey(cachePub) - .WithSigningCertificate(clientPriv) - .WithBrokerVerificationKey(brokerPub) - .WithTls(brokerUri.Scheme == Uri.UriSchemeHttps); - } - - /// <summary> - /// Discovers nodes in the configured cluster and connects to a random node - /// </summary> - /// <param name="Log">A <see cref="ILogProvider"/> to write log events to</param> - /// <param name="cancellationToken">A token to cancel the operation</param> - /// <returns>A task that completes when the operation has been cancelled or an unrecoverable error occured</returns> - /// <exception cref="InvalidOperationException"></exception> - /// <exception cref="OperationCanceledException"></exception> - internal async Task RunAsync(ILogProvider Log, CancellationToken cancellationToken) - { - _ = _client ?? throw new InvalidOperationException("Client configuration not loaded, cannot connect to cache servers"); - - while (true) - { - //Load the server list - ActiveServer[]? servers; - while (true) - { - try - { - Log.Debug("Discovering cluster nodes in broker"); - //Get server list - servers = await _client.DiscoverCacheNodesAsync(cancellationToken); - break; - } - catch (HttpRequestException re) when (re.InnerException is SocketException) - { - Log.Warn("Broker server is unreachable"); - } - catch (Exception ex) - { - Log.Warn("Failed to get server list from broker, reason {r}", ex.Message); - } - - //Gen random ms delay - int randomMsDelay = RandomNumberGenerator.GetInt32(1000, 2000); - await Task.Delay(randomMsDelay, cancellationToken); - } - - if (servers?.Length == 0) - { - Log.Warn("No cluster nodes found, retrying"); - await Task.Delay(RetryInterval, cancellationToken); - continue; - } - - try - { - Log.Debug("Connecting to random cache server"); - - //Connect to a random server - ActiveServer selected = await _client.ConnectToRandomCacheAsync(cancellationToken); - Log.Debug("Connected to cache server {s}", selected.ServerId); - - //Set connection status flag - IsConnected = true; - - //Wait for disconnect - await _client.WaitForExitAsync(cancellationToken); - - Log.Debug("Cache server disconnected"); - } - catch (WebSocketException wse) - { - Log.Warn("Failed to connect to cache server {reason}", wse.Message); - continue; - } - catch (HttpRequestException he) when (he.InnerException is SocketException) - { - Log.Debug("Failed to connect to random cache server server"); - //Continue next loop - continue; - } - finally - { - IsConnected = false; - } - } - } - - - ///<inheritdoc/> - public bool IsConnected { get; private set; } - - - ///<inheritdoc/> - public Task AddOrUpdateAsync<T>(string key, string? newKey, T value, CancellationToken cancellation) - { - return !IsConnected - ? throw new InvalidOperationException("The underlying client is not connected to a cache node") - : _client!.AddOrUpdateObjectAsync(key, newKey, value, cancellation); - } - - ///<inheritdoc/> - public Task DeleteAsync(string key, CancellationToken cancellation) - { - return !IsConnected - ? throw new InvalidOperationException("The underlying client is not connected to a cache node") - : _client!.DeleteObjectAsync(key, cancellation); - } - - - ///<inheritdoc/> - public Task<T?> GetAsync<T>(string key, CancellationToken cancellation) - { - return !IsConnected - ? throw new InvalidOperationException("The underlying client is not connected to a cache node") - : _client!.GetObjectAsync<T>(key, cancellation); - } - } -}
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