feat(news): dynamic settings, IFinlyticLogger, live log streaming, and EF migration

FinlyticNews/Services/N8nService.cs

@@ -1,14 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
 using System.Text.Json;
-using System.Text.Json.Serialization;
+using System.Threading;
+using System.Threading.Tasks;
+using FinlyticCore.Dtos.News;
+using FinlyticCore.Services;
 using FinlyticCore.Util;
+using FinlyticNews.Util;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Logging;
 
 namespace FinlyticNews.Services;
 
-using FinlyticCore.Dtos.News;
-
 /// <summary>
 /// Defines integration operations with the external n8n AI workflow webhook.
 /// </summary>
@@ -26,21 +30,18 @@ public class N8nService : IN8nService
     private readonly HttpClient _httpClient;
     private readonly IServiceScopeFactory _scopeFactory;
     private readonly IConfiguration _configuration;
-    private readonly ILogger<N8nService> _logger;
+    private readonly IFinlyticLogger<N8nService> _finlyticLogger;
 
-    /// <summary>
-    /// Initializes a new instance of the <see cref="N8nService"/> class.
-    /// </summary>
     public N8nService(
         HttpClient httpClient,
         IServiceScopeFactory scopeFactory,
         IConfiguration configuration,
-        ILogger<N8nService> logger)
+        IFinlyticLogger<N8nService> finlyticLogger)
     {
         _httpClient = httpClient;
         _scopeFactory = scopeFactory;
         _configuration = configuration;
-        _logger = logger;
+        _finlyticLogger = finlyticLogger;
     }
 
     /// <inheritdoc />
@@ -48,7 +49,6 @@ public class N8nService : IN8nService
     {
         string? targetUrl = null;
 
-        // 1. Dynamic Settings Resolution (DB Scope -> AppSettings Fallback)
         using (var scope = _scopeFactory.CreateScope())
         {
             var settingsDb = scope.ServiceProvider.GetService<ISettingsDbService>();
@@ -67,17 +67,16 @@ public class N8nService : IN8nService
 
         if (string.IsNullOrWhiteSpace(targetUrl))
         {
-            _logger.LogError("[{Channel}] N8nWebhookUrl is not configured in DB or application settings.", "NewsChannel");
+            await _finlyticLogger.LogErrorAsync(SettingKeys.NewsChannel, "[N8nService] N8nWebhookUrl is not configured in DB or application settings.");
             return null;
         }
 
-        _logger.LogInformation("[{Channel}] Posting article to n8n webhook pipeline at: {Url}", "NewsChannel", targetUrl);
+        await _finlyticLogger.LogInfoAsync(SettingKeys.NewsChannel, "[N8nService] Posting article to n8n webhook pipeline at: {Url}", targetUrl);
 
         var payload = new N8nRequestPayload(content, filteredAssets ?? []);
 
         try
         {
-            // Zero-Allocation / Source-Generated Request Serialization
             var jsonContent = JsonSerializer.Serialize(payload, FinlyticJsonSerializerContext.Default.N8nRequestPayload);
             using var requestContent = new StringContent(jsonContent, System.Text.Encoding.UTF8, "application/json");
 
@@ -86,7 +85,7 @@ public class N8nService : IN8nService
             if (!response.IsSuccessStatusCode)
             {
                 var errorMsg = await response.Content.ReadAsStringAsync(ct);
-                _logger.LogError("[{Channel}] n8n webhook returned status code {StatusCode}. Error payload: {Error}", "NewsChannel", response.StatusCode, errorMsg);
+                await _finlyticLogger.LogErrorAsync(SettingKeys.NewsChannel, "[N8nService] n8n webhook returned status code {StatusCode}. Error payload: {Error}", response.StatusCode, errorMsg);
                 return null;
             }
 
@@ -95,18 +94,16 @@ public class N8nService : IN8nService
             
             var root = doc.RootElement;
 
-            // 2. Robust n8n Array-Unwrapping (Handles [{ "json": { ... } }])
             if (root.ValueKind == JsonValueKind.Array)
             {
                 if (root.GetArrayLength() == 0)
                 {
-                    _logger.LogWarning("[{Channel}] n8n webhook returned an empty array.", "NewsChannel");
+                    await _finlyticLogger.LogWarningAsync(SettingKeys.NewsChannel, "[N8nService] n8n webhook returned an empty array.");
                     return null;
                 }
                 root = root[0];
             }
 
-            // 3. Dynamic Node Wrapper Unwrapping ("json", "output", "data", "body")
             if (root.ValueKind == JsonValueKind.Object)
             {
                 if (root.TryGetProperty("json", out var jsonChild) && jsonChild.ValueKind == JsonValueKind.Object)
@@ -119,13 +116,12 @@ public class N8nService : IN8nService
                     root = bodyChild;
             }
 
-            // 4. Source-Generated Deserialization directly from JsonElement
             var result = root.Deserialize(FinlyticJsonSerializerContext.Default.N8nResponsePayload);
             return result;
         }
         catch (Exception ex)
         {
-            _logger.LogError(ex, "[{Channel}] Failed to communicate with or parse response from n8n webhook workflow.", "NewsChannel");
+            await _finlyticLogger.LogErrorAsync(SettingKeys.NewsChannel, ex, "[N8nService] Failed to communicate with or parse response from n8n webhook workflow.");
             return null;
         }
     }