Creado apartir del commit b888de6c92056de294456f581a56e25e734d4ab7 de develop

adas-core.Application/Services/Caching/RedisLockProvider.cs

@@ -0,0 +1,67 @@
+using StackExchange.Redis;
+using System.Collections.Concurrent;
+using adas_core.Application.Services.Interfaces;
+
+namespace adas_core.Application.Services.Caching
+{
+    /// <summary>
+    /// Lock distribuido en Redis. Usa token por adquisición (owner)
+    /// y liberación segura con script Lua: borra la key solo si el valor coincide.
+    /// </summary>
+    public class RedisLockProvider(Func<IDatabase?> getDatabase) : ILockProvider
+    {
+        private readonly string _prefix = "lock:";
+        private readonly TimeSpan _ttl = TimeSpan.FromSeconds(5);
+        private readonly TimeSpan _retryDelay = TimeSpan.FromMilliseconds(50);
+
+        private static readonly string LuaReleaseScript = @"
+        if redis.call('get', KEYS[1]) == ARGV[1] then
+            return redis.call('del', KEYS[1])
+        else
+            return 0
+        end";
+
+        private readonly ConcurrentDictionary<string, string> _tokens =
+            new(StringComparer.Ordinal);
+
+        public async Task<bool> AcquireAsync(string key, TimeSpan timeout)
+        {
+            var redis = getDatabase();
+            if (redis is null) return false;
+
+            var redisKey = (RedisKey)(_prefix + key);
+            var token = Guid.NewGuid().ToString("N");
+            var end = DateTime.UtcNow.Add(timeout);
+
+            while (DateTime.UtcNow < end)
+            {
+                if (await redis.StringSetAsync(redisKey, token, _ttl, When.NotExists))
+                {
+                    _tokens[key] = token;
+                    return true;
+                }
+
+                await Task.Delay(_retryDelay);
+            }
+
+            return false;
+        }
+
+        public async Task ReleaseAsync(string key)
+        {
+            if (!_tokens.TryRemove(key, out var token))
+                return;
+
+            var redis = getDatabase();
+            if (redis is null) return;
+
+            var redisKey = (RedisKey)(_prefix + key);
+
+            await redis.ScriptEvaluateAsync(
+                LuaReleaseScript,
+                [redisKey],
+                [token]
+            );
+        }
+    }
+}