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/*
* Copyright (c) 2023 Vaughn Nugent
*
* Library: VNLib
* Package: ObjectCacheServer
* File: NodeConfig.cs
*
* NodeConfig.cs is part of ObjectCacheServer which is part of the larger
* VNLib collection of libraries and utilities.
*
* ObjectCacheServer 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.
*
* ObjectCacheServer 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.Net;
using System.Linq;
using System.Text.Json;
using System.Collections.Generic;
using VNLib.Plugins;
using VNLib.Utils.Logging;
using VNLib.Utils.Extensions;
using VNLib.Plugins.Extensions.Loading;
using VNLib.Data.Caching.Extensions.Clustering;
namespace VNLib.Data.Caching.ObjectCache.Server
{
[ConfigurationName("cluster")]
internal sealed class NodeConfig
{
//Default path for the well known endpoint
const string DefaultPath = "/.well-known/vncache";
public CacheNodeConfiguration Config { get; }
public CacheAuthKeyStore KeyStore { get; }
public TimeSpan DiscoveryInterval { get; }
public TimeSpan EventQueuePurgeInterval { get; }
public int MaxQueueDepth { get; }
public string? DiscoveryPath { get; }
public string ConnectPath { get; }
public string WellKnownPath { get; }
public bool VerifyIp { get; }
/// <summary>
/// The maximum number of peer connections to allow
/// </summary>
public uint MaxPeerConnections { get; } = 10;
public NodeConfig(PluginBase plugin, IConfigScope config)
{
//Get the port of the primary webserver
int port;
bool usingTls;
{
//Get the port number of the first virtual host
JsonElement firstHost = plugin.HostConfig.GetProperty("virtual_hosts")
.EnumerateArray()
.First();
port = firstHost.GetProperty("interface")
.GetProperty("port")
.GetInt32();
//If the ssl element is present, ssl is enabled for the server
usingTls = firstHost.TryGetProperty("ssl", out _);
}
string hostname = Dns.GetHostName();
//Server id is just dns name for now
string nodeId = $"{hostname}:{port}";
//Init key store
KeyStore = new(plugin);
DiscoveryInterval = config["discovery_interval_sec"].GetTimeSpan(TimeParseType.Seconds);
//Get the event queue purge interval
EventQueuePurgeInterval = config["queue_purge_interval_sec"].GetTimeSpan(TimeParseType.Seconds);
//Get the max queue depth
MaxQueueDepth = (int)config["max_queue_depth"].GetUInt32();
//Get the connect path
ConnectPath = config["connect_path"].GetString() ?? throw new KeyNotFoundException("Missing required key 'connect_path' in cluster config");
//Get the verify ip setting
VerifyIp = config["verify_ip"].GetBoolean();
Uri connectEp = BuildUri(usingTls, hostname, port, ConnectPath);
Uri? discoveryEp = null;
Config = new();
//Setup cache node config
Config.WithCacheEndpoint(connectEp)
.WithNodeId(nodeId)
.WithAuthenticator(KeyStore)
.WithTls(usingTls);
//Get the discovery path (optional)
if (config.TryGetValue("discovery_path", out JsonElement discoveryPathEl))
{
DiscoveryPath = discoveryPathEl.GetString();
//Enable advertisment if a discovery path is present
if (!string.IsNullOrEmpty(DiscoveryPath))
{
//Build the discovery endpoint, it must be an absolute uri
discoveryEp = BuildUri(usingTls, hostname, port, DiscoveryPath);
Config.EnableAdvertisment(discoveryEp);
}
}
//Allow custom well-known path
if(config.TryGetValue("well_known_path", out JsonElement wkEl))
{
WellKnownPath = wkEl.GetString() ?? DefaultPath;
}
//Default if not set
WellKnownPath ??= DefaultPath;
//Get the max peer connections
if (config.TryGetValue("max_peers", out JsonElement maxPeerEl))
{
MaxPeerConnections = maxPeerEl.GetUInt32();
}
const string CacheConfigTemplate =
@"
Cluster Configuration:
Node Id: {id}
TlsEndabled: {tls}
Verify Ip: {vi}
Well-Known: {wk}
Cache Endpoint: {ep}
Discovery Endpoint: {dep}
Discovery Interval: {di}
Max Peer Connections: {mpc}
Max Queue Depth: {mqd}
Event Queue Purge Interval: {eqpi}
";
//log the config
plugin.Log.Information(CacheConfigTemplate,
nodeId,
usingTls,
VerifyIp,
WellKnownPath,
connectEp,
discoveryEp,
DiscoveryInterval,
MaxPeerConnections,
MaxQueueDepth,
EventQueuePurgeInterval
);
}
private static Uri BuildUri(bool tls, string host, int port, string path)
{
return new UriBuilder
{
Scheme = tls ? "https" : "http",
Host = host,
Port = port,
Path = path
}.Uri;
}
}
}
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