Distributed Locking #9630

0

AI-Bot created 2 months ago

Support Team ABP Agent

To implement distributed locking in ABP Framework, you should use the IAbpDistributedLock interface, which is typically backed by Redis. Your usage of TryAcquireAsync is correct, but there are a few important points to ensure the lock works as expected:

Make sure you are not using the same Redis instance for both cache and lock with conflicting key prefixes.
The lock key must be unique per resource and user to avoid collisions.
The lock timeout (TimeSpan.FromSeconds(1)) may be too short if your operation takes longer than 1 second. If the lock is released before the operation completes, concurrent requests can enter the critical section.
Always check for null on the handle to confirm the lock was acquired.

Here is a recommended pattern for distributed locking in ABP:

public class MyService : ITransientDependency
{
    private readonly IAbpDistributedLock _distributedLock;

    public MyService(IAbpDistributedLock distributedLock)
    {
        _distributedLock = distributedLock;
    }

    public async Task<IActionResult> InsertFormAnswerJson(Guid id, [FromBody] JsonElement json)
    {
        var currentUserId = _currentUser.Id;
        if (currentUserId == null)
        {
            return Unauthorized();
        }

        var lockKey = $"form-submission-lock:{currentUserId}:{id}";

        // Set a reasonable timeout for the lock
        await using var handle = await _distributedLock.TryAcquireAsync(lockKey, TimeSpan.FromSeconds(30));
        if (handle == null)
        {
            _logger.LogInformation($"form-submission[duplicate]:{currentUserId}:{id}");
            return StatusCode(429, "Duplicate submission detected. Please wait a moment before retrying.");
        }

        try
        {
            _logger.LogInformation($"form-submission:{currentUserId}:{id}");
            await _resultAnswerService.SaveUserAnswerAsync(id, currentUserId.Value, json.GetRawText());
            return Ok();
        }
        catch (Exception)
        {
            return StatusCode(500, "An error occurred while processing your submission.");
        }
    }
}

Key points:

Increase the lock timeout to cover the maximum expected processing time.
Do not use the distributed cache as a lock mechanism; use IAbpDistributedLock for locking.
Ensure your Redis connection is stable and not shared with other applications that may interfere with keyspace.

If you still experience issues, verify your Redis server is accessible and not dropping connections, and that your ABP Redis configuration is correct.

Sources:

https://abp.io/docs/latest/solution-templates/microservice/distributed-locking

This response was generated by AI. If it didn’t solve your problem, feel free to post a new answer — our support team will jump in to help you soon.

0

maliming created 2 months ago

Support Team Fullstack Developer

hi

Can you set a breakpoint to see the Type of _distributedLock? It should be MedallionAbpDistributedLock.

Please also inject the IDistributedLockProvider and check its Type. It should be RedisDistributedSynchronizationProvider

Thanks.

0

LiSong created 2 months ago

thanks I am checking

0

maliming created 2 months ago

Support Team Fullstack Developer

ok

0

LiSong created one month ago

I have set up the breakpoints, and I confirm

the Type of _distributedLock is MedallionAbpDistributedLock.

the IDistributedLockProvider is RedisDistributedSynchronizationProvider

but the lock still doesnt work

0

maliming created one month ago

Support Team Fullstack Developer

hi

Could you share a simple project that reproduces the issue?

I will download and check it.

liming.ma@volosoft.com

Thanks.

0

LiSong created one month ago

just sent you an email with the project thanks

0

maliming created one month ago

Support Team Fullstack Developer

Thanks. I will check it.

0

maliming created one month ago

Support Team Fullstack Developer

hi

Can you try to add <PackageReference Include="Volo.Abp.DistributedLocking" Version="9.0.4" /> and typeof(AbpDistributedLockingModule)

I tested, the timeout works.

[11:34:39 INF] Executing handler method Tapp.Web.Pages.IndexModel.OnGetAsync - ModelState is Valid

[11:34:39 INF] Lock acquired successfully...
[11:34:40 WRN] Could not acquire lock...
[11:34:40 WRN] Could not acquire lock...

[11:34:42 INF] Executed handler method OnGetAsync, returned result Microsoft.AspNetCore.Mvc.RazorPages.PageResult.

0

LiSong created one month ago

still not working, pls take a look:

using Microsoft.AspNetCore.Mvc; using Microsoft.Extensions.Logging; using System.Threading.Tasks; using System; using Volo.Abp.DistributedLocking; using Medallion.Threading;

namespace Tapp.Web.Pages;

public class IndexModel : TappPageModel { private readonly IAbpDistributedLock _distributedLock; private readonly IDistributedLockProvider _distributedLockProvider; private readonly ILogger<IndexModel> _logger;

public IndexModel(IAbpDistributedLock distributedLock, IDistributedLockProvider distributedLockProvider, ILogger&lt;IndexModel&gt; logger)
{
    _distributedLock = distributedLock;
    _distributedLockProvider = distributedLockProvider;
    _logger = logger;
}

public string LockTestResult { get; set; }
public virtual async Task&lt;IActionResult&gt; OnGetAsync()
{
    await RunLockTestAsync();
    return Page();
}

private async Task RunLockTestAsync()
{
    var currentUserId = Guid.NewGuid(); // For testing, generate a dummy user id
    var lockKey = $"form-submission-lock:";
    for (int i = 0; i &lt; 3; i++)
    {
        await using var handle = await _distributedLock.TryAcquireAsync(lockKey, TimeSpan.FromSeconds(5));
        if (handle != null)
        {
            await DummyCriticalSection();
            _logger.LogInformation(&quot;Lock acquired and dummy section executed.&quot;);
            //return &quot;Lock acquired and dummy section executed.&quot;;
        }
        else
        {
            _logger.LogWarning(&quot;Could not acquire lock, retrying...&quot;);
        }

    }
    _logger.LogError(&quot;Could not acquire lock after 3 attempts.&quot;);
    //return &quot;Could not acquire lock after 3 attempts.&quot;;
}

private async Task DummyCriticalSection()
{
    await Task.Delay(1000); // Simulate work
}

}

0

LiSong created one month ago

using System.IO; using Microsoft.AspNetCore.Builder; using Microsoft.AspNetCore.Hosting; using Microsoft.AspNetCore.HttpOverrides; using Microsoft.AspNetCore.Mvc.RazorPages; using Microsoft.Extensions.Configuration; using Microsoft.Extensions.DependencyInjection; using Microsoft.Extensions.Hosting; using Tapp.EntityFrameworkCore; using Tapp.Localization; using Tapp.MultiTenancy; using Tapp.Permissions; using Tapp.Web.Menus; using Microsoft.OpenApi.Models; using Volo.Abp; using Volo.Abp.Studio; using Volo.Abp.AspNetCore.Mvc; using Volo.Abp.AspNetCore.Mvc.Localization; using Volo.Abp.AspNetCore.Mvc.UI; using Volo.Abp.AspNetCore.Mvc.UI.Bootstrap; using Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared; using Volo.Abp.AspNetCore.Mvc.UI.Theme.LeptonX; using Volo.Abp.AspNetCore.Mvc.UI.Theme.LeptonX.Bundling; using Volo.Abp.LeptonX.Shared; using Volo.Abp.Autofac; using Volo.Abp.AutoMapper; using Volo.Abp.Modularity; using Volo.Abp.PermissionManagement; using Volo.Abp.PermissionManagement.Web; using Volo.Abp.UI.Navigation.Urls; using Volo.Abp.UI; using Volo.Abp.UI.Navigation; using Volo.Abp.VirtualFileSystem; using Volo.Abp.Identity.Web; using Volo.Abp.FeatureManagement; using OpenIddict.Server.AspNetCore; using OpenIddict.Validation.AspNetCore; using Volo.Abp.AspNetCore.Mvc.UI.Theme.Commercial; using Tapp.Web.HealthChecks; using Volo.Abp.Account.Admin.Web; using Volo.Abp.Account.Public.Web; using Volo.Abp.Account.Public.Web.ExternalProviders; using Volo.Abp.Account.Pro.Public.Web.Shared; using Volo.Abp.AuditLogging.Web; using Volo.Abp.LanguageManagement; using Volo.Abp.TextTemplateManagement.Web; using Volo.Saas.Host; using Volo.Abp.Gdpr.Web; using Volo.Abp.Gdpr.Web.Extensions; using Volo.Abp.OpenIddict.Pro.Web; using System; using System.Security.Cryptography.X509Certificates; using Microsoft.AspNetCore.Authentication; using Microsoft.AspNetCore.Authentication.Google; using Microsoft.AspNetCore.Authentication.MicrosoftAccount; using Microsoft.AspNetCore.Authentication.Twitter; using Microsoft.AspNetCore.Extensions.DependencyInjection; using Volo.Abp.Account.Web; using Volo.Abp.AspNetCore.Mvc.UI.Bundling; using Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Toolbars; using Volo.Abp.AspNetCore.Serilog; using Volo.Abp.Identity; using Volo.Abp.Swashbuckle; using Volo.Abp.OpenIddict; using Volo.Abp.Security.Claims; using Volo.Abp.SettingManagement.Web; using Volo.Abp.Studio.Client.AspNetCore; using Medallion.Threading; using StackExchange.Redis; using Medallion.Threading.Redis; using Volo.Abp.DistributedLocking;

namespace Tapp.Web;

[DependsOn( typeof(AbpDistributedLockingModule), typeof(TappHttpApiModule), typeof(TappApplicationModule), typeof(TappEntityFrameworkCoreModule), typeof(AbpAutofacModule), typeof(AbpStudioClientAspNetCoreModule), typeof(AbpIdentityWebModule), typeof(AbpAspNetCoreMvcUiLeptonXThemeModule), typeof(AbpAccountPublicWebOpenIddictModule), typeof(AbpAuditLoggingWebModule), typeof(SaasHostWebModule), typeof(AbpAccountAdminWebModule), typeof(AbpOpenIddictProWebModule), typeof(LanguageManagementWebModule), typeof(TextTemplateManagementWebModule), typeof(AbpGdprWebModule), typeof(AbpFeatureManagementWebModule), typeof(AbpSwashbuckleModule), typeof(AbpAspNetCoreSerilogModule) )] public class TappWebModule : AbpModule { public override void PreConfigureServices(ServiceConfigurationContext context) { var hostingEnvironment = context.Services.GetHostingEnvironment(); var configuration = context.Services.GetConfiguration();

    context.Services.PreConfigure&lt;AbpMvcDataAnnotationsLocalizationOptions&gt;(options =>
    {
        options.AddAssemblyResource(
            typeof(TappResource),
            typeof(TappDomainModule).Assembly,
            typeof(TappDomainSharedModule).Assembly,
            typeof(TappApplicationModule).Assembly,
            typeof(TappApplicationContractsModule).Assembly,
            typeof(TappWebModule).Assembly
        );
    });

    PreConfigure&lt;OpenIddictBuilder&gt;(builder =>
    {
        builder.AddValidation(options =>
        {
            options.AddAudiences("Tapp");
            options.UseLocalServer();
            options.UseAspNetCore();
        });
    });

    if (!hostingEnvironment.IsDevelopment())
    {
        PreConfigure&lt;AbpOpenIddictAspNetCoreOptions&gt;(options =>
        {
            options.AddDevelopmentEncryptionAndSigningCertificate = false;
        });

        PreConfigure&lt;OpenIddictServerBuilder&gt;(serverBuilder =>
        {
            serverBuilder.AddProductionEncryptionAndSigningCertificate("openiddict.pfx", configuration["AuthServer:CertificatePassPhrase"]!);
            serverBuilder.SetIssuer(new Uri(configuration["AuthServer:Authority"]!));
        });
    }
}

public override void ConfigureServices(ServiceConfigurationContext context)
{
    var hostingEnvironment = context.Services.GetHostingEnvironment();
    var configuration = context.Services.GetConfiguration();

    if (!configuration.GetValue&lt;bool&gt;("App:DisablePII"))
    {
        Microsoft.IdentityModel.Logging.IdentityModelEventSource.ShowPII = true;
        Microsoft.IdentityModel.Logging.IdentityModelEventSource.LogCompleteSecurityArtifact = true;
    }

    if (!configuration.GetValue&lt;bool&gt;("AuthServer:RequireHttpsMetadata"))
    {
        Configure&lt;OpenIddictServerAspNetCoreOptions&gt;(options =>
        {
            options.DisableTransportSecurityRequirement = true;
        });
        
        Configure&lt;ForwardedHeadersOptions&gt;(options =>
        {
            options.ForwardedHeaders = ForwardedHeaders.XForwardedProto;
        });
    }

    context.Services.AddSingleton&lt;IDistributedLockProvider&gt;(sp =>
    {
        var connection = ConnectionMultiplexer.Connect(configuration["Redis:Configuration"]!);
        return new RedisDistributedSynchronizationProvider(connection.GetDatabase());
    });

    ConfigureBundles();
    ConfigureUrls(configuration);
    ConfigurePages(configuration);
    ConfigureImpersonation(context, configuration);
    ConfigureHealthChecks(context);
    ConfigureExternalProviders(context);
    ConfigureCookieConsent(context);
    ConfigureAuthentication(context);
    ConfigureAutoMapper();
    ConfigureVirtualFileSystem(hostingEnvironment);
    ConfigureNavigationServices();
    ConfigureAutoApiControllers();
    ConfigureSwaggerServices(context.Services);
    ConfigureTheme();

    Configure&lt;PermissionManagementOptions&gt;(options =>
    {
        options.IsDynamicPermissionStoreEnabled = true;
    });
}

private void ConfigureCookieConsent(ServiceConfigurationContext context)
{
    context.Services.AddAbpCookieConsent(options =>
    {
        options.IsEnabled = true;
        options.CookiePolicyUrl = "/CookiePolicy";
        options.PrivacyPolicyUrl = "/PrivacyPolicy";
    });
}

private void ConfigureTheme()
{
    Configure&lt;LeptonXThemeOptions&gt;(options =>
    {
        options.DefaultStyle = LeptonXStyleNames.System;
    });

    Configure&lt;LeptonXThemeMvcOptions&gt;(options =>
    {
        options.ApplicationLayout = LeptonXMvcLayouts.SideMenu;
    });
}

private void ConfigureHealthChecks(ServiceConfigurationContext context)
{
    context.Services.AddTappHealthChecks();
}

private void ConfigureBundles()
{
    Configure&lt;AbpBundlingOptions&gt;(options =>
    {
        options.StyleBundles.Configure(
            LeptonXThemeBundles.Styles.Global,
            bundle =>
            {
                bundle.AddFiles("/global-scripts.js");
                bundle.AddFiles("/global-styles.css");
            }
        );
    });
}

private void ConfigurePages(IConfiguration configuration)
{
    Configure&lt;RazorPagesOptions&gt;(options =>
    {
        options.Conventions.AuthorizePage("/HostDashboard", TappPermissions.Dashboard.Host);
        options.Conventions.AuthorizePage("/TenantDashboard", TappPermissions.Dashboard.Tenant);
    });
}

private void ConfigureUrls(IConfiguration configuration)
{
    Configure&lt;AppUrlOptions&gt;(options =>
    {
        options.Applications["MVC"].RootUrl = configuration["App:SelfUrl"];
    });
}

private void ConfigureAuthentication(ServiceConfigurationContext context)
{
    context.Services.ForwardIdentityAuthenticationForBearer(OpenIddictValidationAspNetCoreDefaults.AuthenticationScheme);
    context.Services.Configure&lt;AbpClaimsPrincipalFactoryOptions&gt;(options =>
    {
        options.IsDynamicClaimsEnabled = true;
    });
}

private void ConfigureImpersonation(ServiceConfigurationContext context, IConfiguration configuration)
{
    context.Services.Configure&lt;AbpSaasHostWebOptions&gt;(options =>
    {
        options.EnableTenantImpersonation = true;
    });
    context.Services.Configure&lt;AbpIdentityWebOptions&gt;(options =>
    {
        options.EnableUserImpersonation = true;
    });
    context.Services.Configure&lt;AbpAccountOptions&gt;(options =>
    {
        options.TenantAdminUserName = "admin";
        options.ImpersonationTenantPermission = SaasHostPermissions.Tenants.Impersonation;
        options.ImpersonationUserPermission = IdentityPermissions.Users.Impersonation;
    });
}

private void ConfigureAutoMapper()
{
    Configure&lt;AbpAutoMapperOptions&gt;(options =>
    {
        options.AddMaps&lt;TappWebModule&gt;();
    });
}

private void ConfigureVirtualFileSystem(IWebHostEnvironment hostingEnvironment)
{
    Configure&lt;AbpVirtualFileSystemOptions&gt;(options =>
    {
        options.FileSets.AddEmbedded&lt;TappWebModule&gt;();

        if (hostingEnvironment.IsDevelopment())
        {
            options.FileSets.ReplaceEmbeddedByPhysical&lt;TappDomainSharedModule&gt;(Path.Combine(hostingEnvironment.ContentRootPath, string.Format("..{0}Tapp.Domain.Shared", Path.DirectorySeparatorChar)));
            options.FileSets.ReplaceEmbeddedByPhysical&lt;TappDomainModule&gt;(Path.Combine(hostingEnvironment.ContentRootPath, string.Format("..{0}Tapp.Domain", Path.DirectorySeparatorChar)));
            options.FileSets.ReplaceEmbeddedByPhysical&lt;TappApplicationContractsModule&gt;(Path.Combine(hostingEnvironment.ContentRootPath, string.Format("..{0}Tapp.Application.Contracts", Path.DirectorySeparatorChar)));
            options.FileSets.ReplaceEmbeddedByPhysical&lt;TappApplicationModule&gt;(Path.Combine(hostingEnvironment.ContentRootPath, string.Format("..{0}Tapp.Application", Path.DirectorySeparatorChar)));
            options.FileSets.ReplaceEmbeddedByPhysical&lt;TappHttpApiModule&gt;(Path.Combine(hostingEnvironment.ContentRootPath, string.Format("..{0}..{0}src{0}Tapp.HttpApi", Path.DirectorySeparatorChar)));
            options.FileSets.ReplaceEmbeddedByPhysical&lt;TappWebModule&gt;(hostingEnvironment.ContentRootPath);
        }
    });
}

private void ConfigureNavigationServices()
{
    Configure&lt;AbpNavigationOptions&gt;(options =>
    {
        options.MenuContributors.Add(new TappMenuContributor());
    });

    Configure&lt;AbpToolbarOptions&gt;(options =>
    {
        options.Contributors.Add(new TappToolbarContributor());
    });
}

private void ConfigureAutoApiControllers()
{
    Configure&lt;AbpAspNetCoreMvcOptions&gt;(options =>
    {
        options.ConventionalControllers.Create(typeof(TappApplicationModule).Assembly);
    });
}

private void ConfigureSwaggerServices(IServiceCollection services)
{
    services.AddAbpSwaggerGen(
        options =>
        {
            options.SwaggerDoc("v1", new OpenApiInfo { Title = "Tapp API", Version = "v1" });
            options.DocInclusionPredicate((docName, description) => true);
            options.CustomSchemaIds(type => type.FullName);
        }
    );
}

private void ConfigureExternalProviders(ServiceConfigurationContext context)
{
    context.Services.AddAuthentication()
        .AddGoogle(GoogleDefaults.AuthenticationScheme, options =>
        {
            options.ClaimActions.MapJsonKey(AbpClaimTypes.Picture, "picture");
        })
        .WithDynamicOptions&lt;GoogleOptions, GoogleHandler&gt;(
            GoogleDefaults.AuthenticationScheme,
            options =>
            {
                options.WithProperty(x => x.ClientId);
                options.WithProperty(x => x.ClientSecret, isSecret: true);
            }
        )
        .AddMicrosoftAccount(MicrosoftAccountDefaults.AuthenticationScheme, options =>
        {
            //Personal Microsoft accounts as an example.
            options.AuthorizationEndpoint = "https://login.microsoftonline.com/consumers/oauth2/v2.0/authorize";
            options.TokenEndpoint = "https://login.microsoftonline.com/consumers/oauth2/v2.0/token";

            options.ClaimActions.MapCustomJson("picture", _ => "https://graph.microsoft.com/v1.0/me/photo/$value");
            options.SaveTokens = true;
        })
        .WithDynamicOptions&lt;MicrosoftAccountOptions, MicrosoftAccountHandler&gt;(
            MicrosoftAccountDefaults.AuthenticationScheme,
            options =>
            {
                options.WithProperty(x => x.ClientId);
                options.WithProperty(x => x.ClientSecret, isSecret: true);
            }
        )
        .AddTwitter(TwitterDefaults.AuthenticationScheme, options =>
        {
            options.ClaimActions.MapJsonKey(AbpClaimTypes.Picture,"profile_image_url_https");
            options.RetrieveUserDetails = true;
        })
        .WithDynamicOptions&lt;TwitterOptions, TwitterHandler&gt;(
            TwitterDefaults.AuthenticationScheme,
            options =>
            {
                options.WithProperty(x => x.ConsumerKey);
                options.WithProperty(x => x.ConsumerSecret, isSecret: true);
            }
        );
}


public override void OnApplicationInitialization(ApplicationInitializationContext context)
{
    var app = context.GetApplicationBuilder();
    var env = context.GetEnvironment();

    app.UseForwardedHeaders();

    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }

    app.UseAbpRequestLocalization();

    if (!env.IsDevelopment())
    {
        app.UseErrorPage();
        app.UseHsts();
    }

    app.UseAbpCookieConsent();
    app.UseCorrelationId();
    app.MapAbpStaticAssets();
    app.UseAbpStudioLink();
    app.UseRouting();
    app.UseAbpSecurityHeaders();
    app.UseAuthentication();
    app.UseAbpOpenIddictValidation();

    if (MultiTenancyConsts.IsEnabled)
    {
        app.UseMultiTenancy();
    }

    app.UseUnitOfWork();
    app.UseDynamicClaims();
    app.UseAuthorization();
    app.UseSwagger();
    app.UseAbpSwaggerUI(options =>
    {
        options.SwaggerEndpoint("/swagger/v1/swagger.json", "Tapp API");
    });
    app.UseAuditing();
    app.UseAbpSerilogEnrichers();
    app.UseConfiguredEndpoints();
}

}

0

LiSong created one month ago

sorry, had to create 3 posts, it was too long, so if you checked the screenshot, the types are correct. but still not working,

0

maliming created one month ago

Support Team Fullstack Developer

hi

What is the logic of the RunLockTestAsync?

You can think of distributedLock as SemaphoreSlim syncSemaphore = new SemaphoreSlim(1, 1);

It just supports a distributed scenario.

Thanks.

0

LiSong created 2 months ago

I ended up creating my own distributed lock using redis, and it worked

0

maliming created 2 months ago

Support Team Fullstack Developer

Great 👍

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Distributed Locking #9630

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