70 lines
3.0 KiB
C#
70 lines
3.0 KiB
C#
namespace Microsoft.AspNetCore.Hosting
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{
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public static class IWebHostExtensions
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{
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public static bool IsInKubernetes(this IWebHost webHost)
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{
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var cfg = webHost.Services.GetService<IConfiguration>();
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var orchestratorType = cfg.GetValue<string>("OrchestratorType");
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return orchestratorType?.ToUpper() == "K8S";
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}
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public static IWebHost MigrateDbContext<TContext>(this IWebHost webHost, Action<TContext, IServiceProvider> seeder) where TContext : DbContext
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{
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var underK8s = webHost.IsInKubernetes();
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using var scope = webHost.Services.CreateScope();
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var services = scope.ServiceProvider;
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var logger = services.GetRequiredService<ILogger<TContext>>();
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var context = services.GetService<TContext>();
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try
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{
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logger.LogInformation("Migrating database associated with context {DbContextName}", typeof(TContext).Name);
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if (underK8s)
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{
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InvokeSeeder(seeder, context, services);
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}
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else
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{
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var retries = 10;
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var retry = Policy.Handle<SqlException>()
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.WaitAndRetry(
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retryCount: retries,
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sleepDurationProvider: retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)),
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onRetry: (exception, timeSpan, retry, ctx) =>
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{
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logger.LogWarning(exception, "[{prefix}] Error seeding database (attempt {retry} of {retries})", nameof(TContext), retry, retries);
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});
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//if the sql server container is not created on run docker compose this
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//migration can't fail for network related exception. The retry options for DbContext only
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//apply to transient exceptions
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// Note that this is NOT applied when running some orchestrators (let the orchestrator to recreate the failing service)
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retry.Execute(() => InvokeSeeder(seeder, context, services));
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}
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logger.LogInformation("Migrated database associated with context {DbContextName}", typeof(TContext).Name);
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}
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catch (Exception ex)
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{
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logger.LogError(ex, "An error occurred while migrating the database used on context {DbContextName}", typeof(TContext).Name);
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if (underK8s)
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{
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throw; // Rethrow under k8s because we rely on k8s to re-run the pod
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}
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}
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return webHost;
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}
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private static void InvokeSeeder<TContext>(Action<TContext, IServiceProvider> seeder, TContext context, IServiceProvider services)
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where TContext : DbContext
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{
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context.Database.Migrate();
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seeder(context, services);
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}
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}
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}
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