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/*
* Copyright (c) 2023 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Data.Caching.Providers.VNCache
* File: VnCacheClientConfig.cs
*
* VnCacheClientConfig.cs is part of VNLib.Data.Caching.Providers.VNCache which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Data.Caching.Providers.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.Data.Caching.Providers.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;
using System.Linq;
using System.Text.Json.Serialization;
namespace VNLib.Data.Caching.Providers.VNCache
{
/// <summary>
/// Represents a remote VNCache client configuration
/// </summary>
public class VnCacheClientConfig : VNCacheConfig
{
/// <summary>
/// The broker server address
/// </summary>
[JsonPropertyName("use_tls")]
public bool UseTls { get; set; } = true;
/// <summary>
/// The time (in seconds) to randomly delay polling the broker server
/// for available servers
/// </summary>
[JsonPropertyName("discovery_interval_sec")]
public int? DiscoveryIntervalSeconds { get; set; }
/// <summary>
/// The maximum time (in seconds) for FBM cache operations are allowed
/// to take before timing out.
/// </summary>
/// <remarks>
/// NOTE: You should set this value to something reasonable as FBM messages can
/// be lost and cause deadlocks if your cache implementation does not rely on
/// CancellationTokens
/// </remarks>
[JsonPropertyName("request_timeout_sec")]
public int? RequestTimeoutSeconds { get; set; }
/// <summary>
/// Retry interval in a timespan
/// </summary>
internal TimeSpan DiscoveryInterval => TimeSpan.FromSeconds(DiscoveryIntervalSeconds!.Value);
/// <summary>
/// FBM Request timeout
/// </summary>
internal TimeSpan RequestTimeout => TimeSpan.FromSeconds(RequestTimeoutSeconds!.Value);
/// <summary>
/// The initial peers to connect to
/// </summary>
[JsonPropertyName("initial_nodes")]
public string[]? InitialNodes { get; set; }
/// <summary>
/// Gets the initial nodes as a collection of URIs
/// </summary>
/// <returns>The nodes as a collection of URIs</returns>
/// <exception cref="InvalidOperationException"></exception>
public Uri[] GetInitialNodeUris()
{
_ = InitialNodes ?? throw new InvalidOperationException("Initial nodes have not been set");
return InitialNodes.Select(static x => new Uri(x, UriKind.Absolute)).ToArray();
}
///<inheritdoc/>
public override void Validate()
{
base.Validate();
if (!DiscoveryIntervalSeconds.HasValue || DiscoveryIntervalSeconds.Value < 1)
{
throw new ArgumentException("You must specify a discovery interval period greater than 0", "retry_interval_sec");
}
//Allow a 0 timeout to disable timeouts, not recommended, but allowed
if (!RequestTimeoutSeconds.HasValue || RequestTimeoutSeconds.Value < 0)
{
throw new ArgumentException("You must specify a positive integer FBM message timoeut", "request_timeout_sec");
}
//Validate initial nodes
if (InitialNodes == null || InitialNodes.Length == 0)
{
throw new ArgumentException("You must specify at least one initial peer", "initial_peers");
}
//Validate initial nodes
foreach (Uri peer in GetInitialNodeUris())
{
if (!peer.IsAbsoluteUri)
{
throw new ArgumentException("You must specify an absolute URI for each initial node", "initial_nodes");
}
//Verify http connection
if (peer.Scheme != Uri.UriSchemeHttp && peer.Scheme != Uri.UriSchemeHttps)
{
throw new ArgumentException("You must specify an HTTP or HTTPS URI for each initial node", "initial_nodes");
}
}
}
}
}
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