Joseph Doherty
51 lines
2.9 KiB
C#
51 lines
2.9 KiB
C#
using Microsoft.Extensions.Options;
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namespace ZB.MOM.WW.LocalDb.Replication;
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/// <summary>
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/// Validates <see cref="ReplicationOptions"/> at startup, accumulating every failure into one result.
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/// <see cref="ReplicationOptions.PeerAddress"/> is only required for the initiator role, which the
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/// validator cannot distinguish from a passive node, so its format is checked only when present.
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/// </summary>
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public sealed class ReplicationOptionsValidator : IValidateOptions<ReplicationOptions>
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{
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// Also what keeps SyncBackgroundService's unchecked backoff doubling overflow-safe.
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private static readonly TimeSpan ReconnectBackoffCeiling = TimeSpan.FromDays(1);
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public ValidateOptionsResult Validate(string? name, ReplicationOptions options)
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{
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var failures = new List<string>();
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if (!string.IsNullOrEmpty(options.PeerAddress)
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&& (!Uri.TryCreate(options.PeerAddress, UriKind.Absolute, out var uri)
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|| (uri.Scheme != Uri.UriSchemeHttp && uri.Scheme != Uri.UriSchemeHttps)))
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failures.Add(
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$"LocalDb:Replication:PeerAddress must be an absolute http/https URI; got '{options.PeerAddress}'.");
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// ApiKey needs no validation: null/empty legitimately means "no key auth".
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if (options.FlushInterval <= TimeSpan.Zero)
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failures.Add($"LocalDb:Replication:FlushInterval must be greater than zero; got {options.FlushInterval}.");
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if (options.MaxBatchSize <= 0)
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failures.Add($"LocalDb:Replication:MaxBatchSize must be greater than 0; got {options.MaxBatchSize}.");
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if (options.MaxOplogRows <= 0)
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failures.Add($"LocalDb:Replication:MaxOplogRows must be greater than 0; got {options.MaxOplogRows}.");
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if (options.MaxOplogAge <= TimeSpan.Zero)
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failures.Add($"LocalDb:Replication:MaxOplogAge must be greater than zero; got {options.MaxOplogAge}.");
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if (options.TombstoneRetention <= TimeSpan.Zero)
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failures.Add($"LocalDb:Replication:TombstoneRetention must be greater than zero; got {options.TombstoneRetention}.");
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if (options.ReconnectBackoffMax <= TimeSpan.Zero)
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failures.Add($"LocalDb:Replication:ReconnectBackoffMax must be greater than zero; got {options.ReconnectBackoffMax}.");
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else if (options.ReconnectBackoffMax > ReconnectBackoffCeiling)
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failures.Add($"LocalDb:Replication:ReconnectBackoffMax must be at most {ReconnectBackoffCeiling}; got {options.ReconnectBackoffMax}.");
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if (options.MaintenanceInterval <= TimeSpan.Zero)
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failures.Add($"LocalDb:Replication:MaintenanceInterval must be greater than zero; got {options.MaintenanceInterval}.");
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if (options.MaxHlcDriftAhead <= TimeSpan.Zero)
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failures.Add($"LocalDb:Replication:MaxHlcDriftAhead must be greater than zero; got {options.MaxHlcDriftAhead}.");
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return failures.Count > 0
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? ValidateOptionsResult.Fail(failures)
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: ValidateOptionsResult.Success;
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}
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}
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