86 lines
3.2 KiB
C#
86 lines
3.2 KiB
C#
using CommandLine;
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using Newtonsoft.Json;
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using System.Diagnostics.CodeAnalysis;
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using System.Reflection;
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namespace RegexBot;
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/// <summary>
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/// Contains essential instance configuration for this bot including Discord connection settings, service configuration,
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/// and command-line options.
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/// </summary>
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class InstanceConfig {
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/// <summary>
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/// Token used for Discord authentication.
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/// </summary>
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internal string BotToken { get; }
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/// <summary>
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/// List of assemblies to load, by file. Paths are always relative to the bot directory.
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/// </summary>
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internal IReadOnlyList<string> Assemblies { get; }
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public string? SqlHost { get; }
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public string? SqlDatabase { get; }
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public string SqlUsername { get; }
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public string SqlPassword { get; }
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/// <summary>
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/// Sets up instance configuration object from file and command line parameters.
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/// </summary>
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internal InstanceConfig() {
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var args = CommandLineParameters.Parse(Environment.GetCommandLineArgs());
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var path = args?.ConfigFile ?? Path.GetDirectoryName(Assembly.GetEntryAssembly()!.Location)
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+ Path.DirectorySeparatorChar + "." + Path.DirectorySeparatorChar + "instance.json";
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JObject conf;
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try {
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var conftxt = File.ReadAllText(path);
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conf = JObject.Parse(conftxt);
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} catch (Exception ex) {
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string pfx;
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if (ex is JsonException) pfx = "Unable to parse configuration: ";
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else pfx = "Unable to access configuration: ";
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throw new Exception(pfx + ex.Message, ex);
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}
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BotToken = ReadConfKey<string>(conf, nameof(BotToken), true);
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try {
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Assemblies = Common.Utilities.LoadStringOrStringArray(conf[nameof(Assemblies)]).AsReadOnly();
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} catch (ArgumentNullException) {
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Assemblies = Array.Empty<string>();
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} catch (ArgumentException) {
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throw new Exception($"'{nameof(Assemblies)}' is not properly specified in configuration.");
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}
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SqlHost = ReadConfKey<string>(conf, nameof(SqlHost), false);
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SqlDatabase = ReadConfKey<string?>(conf, nameof(SqlDatabase), false);
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SqlUsername = ReadConfKey<string>(conf, nameof(SqlUsername), true);
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SqlPassword = ReadConfKey<string>(conf, nameof(SqlPassword), true);
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}
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private static T? ReadConfKey<T>(JObject jc, string key, [DoesNotReturnIf(true)] bool failOnEmpty) {
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if (jc.ContainsKey(key)) return jc[key]!.Value<T>();
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if (failOnEmpty) throw new Exception($"'{key}' must be specified in the instance configuration.");
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return default;
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}
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class CommandLineParameters {
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[Option('c', "config", Default = null)]
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public string? ConfigFile { get; set; } = null!;
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public static CommandLineParameters? Parse(string[] args) {
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CommandLineParameters? result = null;
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new Parser(settings => {
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settings.IgnoreUnknownArguments = true;
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settings.AutoHelp = false;
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settings.AutoVersion = false;
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}).ParseArguments<CommandLineParameters>(args)
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.WithParsed(p => result = p)
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.WithNotParsed(e => { /* ignore */ });
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return result;
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}
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}
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}
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