feat : ajout d'un intercepteur de requêtes lentes EF Core et une configuration des options de performance
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146
Webzine.WebApplication/Interceptors/EfSlowQueryInterceptor.cs
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146
Webzine.WebApplication/Interceptors/EfSlowQueryInterceptor.cs
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namespace Webzine.WebApplication.Interceptors;
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using System.Data.Common;
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using System.Diagnostics;
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using Configuration;
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using Microsoft.EntityFrameworkCore.Diagnostics;
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using Microsoft.Extensions.Options;
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/// <summary>
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/// Intercepteur EF Core qui journalise uniquement les commandes SQL dépassant le seuil configuré.
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/// Remonte la pile d'appels pour identifier la méthode repository (<c>Webzine.Repository.*</c>) à l'origine de la requête.
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/// </summary>
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/// <remarks>
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/// <para>
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/// <b>Références :</b>
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/// <list type="bullet">
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/// <item>
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/// EF Core interceptors (doc officielle) :
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/// <see href="https://learn.microsoft.com/en-us/ef/core/logging-events-diagnostics/interceptors"/>
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/// </item>
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/// <item>
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/// <see cref="DbCommandInterceptor"/> API :
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/// <see href="https://learn.microsoft.com/en-us/dotnet/api/microsoft.entityframeworkcore.diagnostics.dbcommandinterceptor"/>
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/// </item>
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/// <item>
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/// Exemple de slow-query interceptor (SO) :
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/// <see href="https://medium.com/@sudipdevdev/how-to-detect-and-log-slow-queries-in-entity-framework-core-e2ab71024849"/>
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/// </item>
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/// <item>
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/// <see cref="System.Diagnostics.StackTrace"/> pour remonter l'appelant :
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/// <see href="https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.stacktrace"/>
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/// </item>
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/// <item>
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/// Enregistrement via <c>AddInterceptors</c> :
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/// <see href="https://learn.microsoft.com/en-us/ef/core/logging-events-diagnostics/interceptors#registering-interceptors"/>
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/// </item>
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/// </list>
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/// </para>
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/// </remarks>
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public class EfSlowQueryInterceptor : DbCommandInterceptor
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{
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private readonly ILogger<EfSlowQueryInterceptor> logger;
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private readonly int seuilMs;
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/// <summary>
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/// Initializes a new instance of the <see cref="EfSlowQueryInterceptor"/> class.
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/// </summary>
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/// <param name="logger">Le service de journalisation injecté pour suivre les opérations de l'intercepteur.</param>
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/// <param name="options">Les options de performance EF injectées pour récupérer le seuil de lenteur configuré.</param>
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public EfSlowQueryInterceptor(ILogger<EfSlowQueryInterceptor> logger, IOptions<EfPerformanceOptions> options)
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{
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this.logger = logger;
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this.seuilMs = options.Value.SeuilMs;
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this.logger.LogDebug("[EfSlowQueryInterceptor] Constructeur appelé — seuil : {SeuilMs} ms.", this.seuilMs);
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}
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/// <inheritdoc/>
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public override DbDataReader ReaderExecuted(DbCommand command, CommandExecutedEventData eventData, DbDataReader result)
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{
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this.JournaliserSiLent(eventData.Duration);
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return result;
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}
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/// <inheritdoc/>
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public override ValueTask<DbDataReader> ReaderExecutedAsync(DbCommand command, CommandExecutedEventData eventData, DbDataReader result, CancellationToken cancellationToken = default)
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{
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this.JournaliserSiLent(eventData.Duration);
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return ValueTask.FromResult(result);
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}
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/// <inheritdoc/>
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public override int NonQueryExecuted(DbCommand command, CommandExecutedEventData eventData, int result)
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{
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this.JournaliserSiLent(eventData.Duration);
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return result;
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}
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/// <inheritdoc/>
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public override ValueTask<int> NonQueryExecutedAsync(DbCommand command, CommandExecutedEventData eventData, int result, CancellationToken cancellationToken = default)
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{
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this.JournaliserSiLent(eventData.Duration);
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return ValueTask.FromResult(result);
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}
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/// <inheritdoc/>
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public override object? ScalarExecuted(DbCommand command, CommandExecutedEventData eventData, object? result)
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{
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this.JournaliserSiLent(eventData.Duration);
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return result;
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}
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/// <inheritdoc/>
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public override ValueTask<object?> ScalarExecutedAsync(DbCommand command, CommandExecutedEventData eventData, object? result, CancellationToken cancellationToken = default)
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{
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this.JournaliserSiLent(eventData.Duration);
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return ValueTask.FromResult(result);
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}
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/// <summary>
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/// Remonte la pile d'appels pour trouver la première méthode dans <c>Webzine.Repository</c>.
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/// Toutes les requêtes EF Core du projet transitent par ce namespace, ce qui garantit
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/// un résultat pertinent sans parcourir l'intégralité de la stack.
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/// </summary>
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/// <returns>Chaîne <c>Classe.Méthode</c> ou <c>"inconnu"</c> si rien trouvé.</returns>
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/// <remarks>
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/// <see cref="StackTrace"/> est instancié uniquement quand le seuil est dépassé,
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/// ce qui évite tout impact sur le chemin nominal.
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/// Ref : <see href="https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.stacktrace"/>.
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/// </remarks>
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private static string TrouverAppelantRepository()
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{
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// skipFrames: 1 pour sauter TrouverAppelantRepository elle-même
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// fNeedFileInfo: false — on ne veut pas les numéros de ligne (coût supplémentaire inutile)
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var frames = new StackTrace(skipFrames: 1, fNeedFileInfo: false).GetFrames();
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foreach (var frame in frames)
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{
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var methode = frame.GetMethod();
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if (methode?.DeclaringType?.Namespace?.StartsWith("Webzine.Repository", StringComparison.Ordinal) == true)
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{
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return $"{methode.DeclaringType.Name}.{methode.Name}";
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}
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}
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return "inconnu";
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}
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private void JournaliserSiLent(TimeSpan duree)
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{
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if (duree.TotalMilliseconds > this.seuilMs)
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{
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var appelant = TrouverAppelantRepository();
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this.logger.LogWarning(
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"[EfSlowQueryInterceptor] Opération EF Core lente détectée — durée réelle : {DureeMs} ms — seuil : {SeuilMs} ms — dépassement : +{Depassement} ms.{NewLine}Appelant : {Appelant}",
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duree.TotalMilliseconds.ToString("F2"),
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this.seuilMs,
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(duree.TotalMilliseconds - this.seuilMs).ToString("F2"),
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Environment.NewLine,
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appelant);
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}
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}
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}
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