Add new HTTP workflow tests and enhance middleware

Introduce tests for resuming specific HTTP workflow instances. Enhanced `HttpWorkflowsMiddleware` to handle workflow instance IDs and correlation IDs for more precise control over workflow activation and resumption.

src/modules/Elsa.Http/Middleware/HttpWorkflowsMiddleware.cs

@@ -69,6 +69,8 @@ public class HttpWorkflowsMiddleware(RequestDelegate next, IOptions<HttpActivity
         var request = httpContext.Request;
         var method = request.Method.ToLowerInvariant();
         var httpWorkflowLookupService = serviceProvider.GetRequiredService<IHttpWorkflowLookupService>();
+        var workflowInstanceId = await GetWorkflowInstanceIdAsync(serviceProvider, httpContext, cancellationToken);
+        var correlationId = await GetCorrelationIdAsync(serviceProvider, httpContext, cancellationToken);
         var bookmarkHash = ComputeBookmarkHash(serviceProvider, matchingPath, method);
         var lookupResult = await httpWorkflowLookupService.FindWorkflowAsync(bookmarkHash, cancellationToken);
 
@@ -76,7 +78,7 @@ public class HttpWorkflowsMiddleware(RequestDelegate next, IOptions<HttpActivity
         {
             var triggers = lookupResult.Triggers;
 
-            if (triggers?.Count > 1)
+            if (triggers.Count > 1)
             {
                 await HandleMultipleWorkflowsFoundAsync(httpContext, () => triggers.Select(x => new
                 {
@@ -85,16 +87,16 @@ public class HttpWorkflowsMiddleware(RequestDelegate next, IOptions<HttpActivity
                 return;
             }
 
-            var trigger = triggers?.FirstOrDefault();
+            var trigger = triggers.FirstOrDefault();
             if (trigger != null)
             {
                 var workflowGraph = lookupResult.WorkflowGraph!;
-                await StartWorkflowAsync(httpContext, trigger, workflowGraph, input);
+                await StartWorkflowAsync(httpContext, trigger, workflowGraph, workflowInstanceId, correlationId, input);
                 return;
             }
         }
 
-        var bookmarks = await FindBookmarksAsync(serviceProvider, bookmarkHash, cancellationToken).ToList();
+        var bookmarks = await FindBookmarksAsync(serviceProvider, bookmarkHash, workflowInstanceId, correlationId, cancellationToken).ToList();
 
         if (bookmarks.Count > 1)
         {
@@ -109,7 +111,7 @@ public class HttpWorkflowsMiddleware(RequestDelegate next, IOptions<HttpActivity
 
         if (bookmark != null)
         {
-            await ResumeWorkflowAsync(httpContext, bookmark, input);
+            await ResumeWorkflowAsync(httpContext, bookmark, correlationId, input);
             return;
         }
 
@@ -131,7 +133,7 @@ public class HttpWorkflowsMiddleware(RequestDelegate next, IOptions<HttpActivity
         return await workflowDefinitionService.FindWorkflowGraphAsync(workflowDefinitionId, cancellationToken);
     }
 
-    private async Task StartWorkflowAsync(HttpContext httpContext, StoredTrigger trigger, WorkflowGraph workflowGraph, IDictionary<string, object> input)
+    private async Task StartWorkflowAsync(HttpContext httpContext, StoredTrigger trigger, WorkflowGraph workflowGraph, string? workflowInstanceId, string? correlationId, Dictionary<string, object>? input)
     {
         var serviceProvider = httpContext.RequestServices;
         var cancellationToken = httpContext.RequestAborted;
@@ -144,8 +146,6 @@ public class HttpWorkflowsMiddleware(RequestDelegate next, IOptions<HttpActivity
         await ExecuteWithinTimeoutAsync(async ct =>
         {
             var cancellationTokens = new CancellationTokens(ct, ct);
-            var workflowInstanceId = await GetWorkflowInstanceIdAsync(serviceProvider, httpContext, httpContext.RequestAborted);
-            var correlationId = await GetCorrelationIdAsync(serviceProvider, httpContext, httpContext.RequestAborted);
             var startParams = new StartWorkflowHostParams
             {
                 Input = input,
@@ -160,7 +160,7 @@ public class HttpWorkflowsMiddleware(RequestDelegate next, IOptions<HttpActivity
         await HandleWorkflowFaultAsync(serviceProvider, httpContext, workflowHost.WorkflowState, cancellationToken);
     }
 
-    private async Task ResumeWorkflowAsync(HttpContext httpContext, StoredBookmark bookmark, IDictionary<string, object> input)
+    private async Task ResumeWorkflowAsync(HttpContext httpContext, StoredBookmark bookmark, string? correlationId, IDictionary<string, object> input)
     {
         var serviceProvider = httpContext.RequestServices;
         var cancellationToken = httpContext.RequestAborted;
@@ -193,7 +193,6 @@ public class HttpWorkflowsMiddleware(RequestDelegate next, IOptions<HttpActivity
 
         await ExecuteWithinTimeoutAsync(async ct =>
         {
-            var correlationId = await GetCorrelationIdAsync(serviceProvider, httpContext, ct);
             var cancellationTokens = new CancellationTokens(ct, ct);
             var resumeParams = new ResumeWorkflowHostParams
             {
@@ -219,12 +218,14 @@ public class HttpWorkflowsMiddleware(RequestDelegate next, IOptions<HttpActivity
         return await triggerStore.FindManyAsync(triggerFilter, cancellationToken);
     }
 
-    private async Task<IEnumerable<StoredBookmark>> FindBookmarksAsync(IServiceProvider serviceProvider, string bookmarkHash, CancellationToken cancellationToken)
+    private async Task<IEnumerable<StoredBookmark>> FindBookmarksAsync(IServiceProvider serviceProvider, string bookmarkHash, string? workflowInstanceId, string? correlationId, CancellationToken cancellationToken)
     {
         var bookmarkStore = serviceProvider.GetRequiredService<IBookmarkStore>();
         var bookmarkFilter = new BookmarkFilter
         {
-            Hash = bookmarkHash
+            Hash = bookmarkHash,
+            WorkflowInstanceId = workflowInstanceId,
+            CorrelationId = correlationId
         };
         return await bookmarkStore.FindManyAsync(bookmarkFilter, cancellationToken);
     }

test/component/Elsa.Workflows.ComponentTests/Elsa.Workflows.ComponentTests.csproj

@@ -30,9 +30,6 @@
         <None Update="Scenarios\WorkflowCompletion\fork.json">
             <CopyToOutputDirectory>Always</CopyToOutputDirectory>
         </None>
-        <None Update="Scenarios\HttpWorkflows\http-hello-world.json">
-            <CopyToOutputDirectory>Always</CopyToOutputDirectory>
-        </None>
         <None Update="Scenarios\LogPersistenceModes\input-output-logging-1.json">
             <CopyToOutputDirectory>Always</CopyToOutputDirectory>
         </None>
@@ -81,6 +78,9 @@
         <None Update="Scenarios\WorkflowDefinitionReload\Workflows\http-workflow.json">
           <CopyToOutputDirectory>Always</CopyToOutputDirectory>
         </None>
+        <None Update="Scenarios\HttpWorkflows\Workflows\http-hello-world.json">
+          <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+        </None>
     </ItemGroup>
 
 </Project>

test/component/Elsa.Workflows.ComponentTests/Scenarios/HttpWorkflows/ResumeSpecificHttpWorkflowInstanceTests.cs

@@ -0,0 +1,40 @@
+using System.Net;
+using Elsa.Workflows.Contracts;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Elsa.Workflows.ComponentTests.Scenarios.HttpWorkflows;
+
+public class ResumeSpecificHttpWorkflowInstanceTests(App app) : AppComponentTest(app)
+{
+    [Theory]
+    [InlineData("workflowInstanceId")]
+    [InlineData("correlationId")]
+    public async Task ResumingSpecificWorkflow_ShouldResumeSpecifiedWorkflow(string identifierKey)
+    {
+        var client = WorkflowServer.CreateHttpWorkflowClient();
+
+        // Start 3 instances.
+        var workflowInstanceId1 = await StartWorkflowAsync(client, identifierKey);
+        var workflowInstanceId2 = await StartWorkflowAsync(client, identifierKey);
+        var workflowInstanceId3 = await StartWorkflowAsync(client, identifierKey);
+
+        // Resume the 2nd instance.
+        var response = await ResumeWorkflowAsync(client, identifierKey, workflowInstanceId2);
+        
+        // Response should be OK.
+        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+    }
+
+    private async Task<string> StartWorkflowAsync(HttpClient client, string identifierKey)
+    {
+        var identityGenerator = Scope.ServiceProvider.GetRequiredService<IIdentityGenerator>();
+        var identifierValue = identityGenerator.GenerateId();
+        await client.GetStringAsync($"simple-http-api/start?{identifierKey}={identifierValue}");
+        return identifierValue;
+    }
+
+    private async Task<HttpResponseMessage> ResumeWorkflowAsync(HttpClient client, string identifierKey, string identifierValue)
+    {
+        return await client.GetAsync($"simple-http-api/resume?{identifierKey}={identifierValue}");
+    }
+}

test/component/Elsa.Workflows.ComponentTests/Scenarios/HttpWorkflows/Workflows/SimpleHttpApiWorkflow.cs

@@ -0,0 +1,30 @@
+using Elsa.Http;
+using Elsa.Workflows.Activities;
+using Elsa.Workflows.Contracts;
+using Microsoft.AspNetCore.Http;
+
+namespace Elsa.Workflows.ComponentTests.Scenarios.HttpWorkflows.Workflows;
+
+public class SimpleHttpApiWorkflow : WorkflowBase
+{
+    protected override void Build(IWorkflowBuilder builder)
+    {
+        builder.Root = new Sequence
+        {
+            Activities =
+            [
+                new HttpEndpoint
+                {
+                    Path = new("simple-http-api/start"),
+                    SupportedMethods = new([HttpMethods.Get]),
+                    CanStartWorkflow = true
+                },
+                new HttpEndpoint
+                {
+                    Path = new("simple-http-api/resume"),
+                    SupportedMethods = new([HttpMethods.Get])
+                }
+            ]
+        };
+    }
+}