51 lines
1.9 KiB
C#
51 lines
1.9 KiB
C#
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using System.Globalization;
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using StackExchange.Redis;
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namespace w4c_workflows.Services.Triggers;
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/// <summary>
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/// Stores the last time a scheduled trigger (cron/interval) fired, per
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/// workflow. Redis-backed in v1 (key <c>wf:{tenant}:triggers:{workflowId}:lastFire</c>);
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/// ephemeral by design — losing it only re-fires a workflow once, which is safe
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/// because delivery is at-least-once and the run lifecycle dedups via
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/// correlation id.
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/// </summary>
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public interface ITriggerState
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{
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Task<DateTimeOffset?> GetLastFireAsync(string tenantId, Guid workflowId, CancellationToken ct);
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Task SetLastFireAsync(string tenantId, Guid workflowId, DateTimeOffset at, CancellationToken ct);
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}
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public class RedisTriggerState : ITriggerState
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{
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private readonly IDatabase _db;
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private readonly TimeSpan _ttl;
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public RedisTriggerState(IConnectionMultiplexer redis, IConfiguration config)
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{
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_db = redis.GetDatabase();
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_ttl = TimeSpan.FromDays(ParseInt(config["Workflows:TriggerStateTtlDays"], 90));
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}
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public async Task<DateTimeOffset?> GetLastFireAsync(string tenantId, Guid workflowId, CancellationToken ct)
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{
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var value = await _db.StringGetAsync(KeyFor(tenantId, workflowId));
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if (value.IsNullOrEmpty)
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return null;
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return DateTimeOffset.TryParse(value.ToString(), CultureInfo.InvariantCulture,
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DateTimeStyles.RoundtripKind, out var parsed)
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? parsed
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: null;
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}
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public Task SetLastFireAsync(string tenantId, Guid workflowId, DateTimeOffset at, CancellationToken ct)
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=> _db.StringSetAsync(KeyFor(tenantId, workflowId), at.ToString("O"), _ttl);
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private static RedisKey KeyFor(string tenantId, Guid workflowId)
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=> $"wf:{tenantId}:triggers:{workflowId}:lastFire";
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private static int ParseInt(string? text, int fallback)
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=> int.TryParse(text, out var value) && value > 0 ? value : fallback;
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}
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