microsoft · joslat · Nov 13, 2024 · Nov 14, 2024 · Nov 14, 2024 · Nov 14, 2024
@@ -43,6 +43,7 @@
     <PackageVersion Include="FastBertTokenizer" Version="1.0.28" />
     <PackageVersion Include="PdfPig" Version="0.1.9" />
     <PackageVersion Include="Pinecone.NET" Version="2.1.1" />
+    <PackageVersion Include="PuppeteerSharp" Version="20.0.5" />
     <PackageVersion Include="System.Diagnostics.DiagnosticSource" Version="8.0.1" />
     <PackageVersion Include="System.Linq.Async" Version="6.0.1" />
     <PackageVersion Include="System.Memory.Data" Version="8.0.1" />

@@ -30,6 +30,7 @@
     <PackageReference Include="Microsoft.Extensions.Logging.Console" />
     <PackageReference Include="coverlet.collector" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" />
+    <PackageReference Include="PuppeteerSharp" />
     <PackageReference Include="xunit" />
     <PackageReference Include="xunit.abstractions" />
     <PackageReference Include="xunit.runner.visualstudio" />

@@ -5,6 +5,8 @@
 using Microsoft.SemanticKernel;
 using Microsoft.SemanticKernel.ChatCompletion;
 using SharedSteps;
+using Microsoft.SemanticKernel.Process;
+using Utilities;
 
 namespace Step01;
 
@@ -64,6 +66,15 @@ public async Task UseSimpleProcessAsync()
         // Build the process to get a handle that can be started
         KernelProcess kernelProcess = process.Build();
 
+        // Generate a Mermaid diagram for the process and print it to the console
+        string mermaidGraph = kernelProcess.ToMermaid();
+        Console.WriteLine($"=== Start - Mermaid Diagram for '{process.Name}' ===");
+        Console.WriteLine(mermaidGraph);
+        Console.WriteLine($"=== End - Mermaid Diagram for '{process.Name}' ===");
+
+        // Generate an image from the Mermaid diagram
+        await MermaidRenderer.GenerateMermaidImageAsync(mermaidGraph, "ChatBotProcess.png");
+
         // Start the process with an initial external event
         using var runningProcess = await kernelProcess.StartAsync(kernel, new KernelProcessEvent() { Id = ChatBotEvents.StartProcess, Data = null });
     }

@@ -0,0 +1,84 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System.Reflection;
+using PuppeteerSharp;
+
+namespace Utilities;
+
+/// <summary>
+/// Renders Mermaid diagrams to images using Puppeteer-Sharp.
+/// </summary>
+public static class MermaidRenderer
+{
+    /// <summary>
+    /// Generates a Mermaid diagram image from the provided Mermaid code.
+    /// </summary>
+    /// <param name="mermaidCode"></param>
+    /// <param name="filename"></param>
+    /// <returns></returns>
+    /// <exception cref="InvalidOperationException"></exception>
+    public static async Task GenerateMermaidImageAsync(string mermaidCode, string filename)
+    {
+        // Locate the current assembly's directory
+        string? assemblyPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
+        if (assemblyPath == null)
+        {
+            throw new InvalidOperationException("Could not determine the assembly path.");
+        }
+
+        // Define the output folder path and create it if it doesn't exist
+        string outputPath = Path.Combine(assemblyPath, "output");
+        Directory.CreateDirectory(outputPath);
+
+        // Full path for the output file
+        string outputFilePath = Path.Combine(outputPath, filename);
+
+        // Download Chromium if it hasn't been installed yet
+        BrowserFetcher browserFetcher = new();
+        browserFetcher.Browser = SupportedBrowser.Chrome;
+        await browserFetcher.DownloadAsync();
+        //await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultChromiumRevision);
+
+        // Define the HTML template with Mermaid.js CDN
+        string htmlContent = $@"
+        <html>
+            <head>
+                <style>
+                    body {{
+                        display: flex;
+                        align-items: center;
+                        justify-content: center;
+                        margin: 0;
+                        height: 100vh;
+                    }}
+                </style>
+                <script type=""module"">
+                    import mermaid from 'https://cdn.jsdelivr.net/npm/mermaid@10/dist/mermaid.esm.min.mjs';
+                    mermaid.initialize({{ startOnLoad: true }});
+                </script>
+            </head>
+            <body>
+                <div class=""mermaid"">
+                    {mermaidCode}
+                </div>
+            </body>
+        </html>";
+
+        // Create a temporary HTML file with the Mermaid code
+        string tempHtmlFile = Path.Combine(Path.GetTempPath(), "mermaid_temp.html");
+        await File.WriteAllTextAsync(tempHtmlFile, htmlContent);
+
+        // Launch Puppeteer-Sharp with a headless browser to render the Mermaid diagram
+        using (var browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = true }))
+        using (var page = await browser.NewPageAsync())
+        {
+            await page.GoToAsync($"file://{tempHtmlFile}");
+            await page.WaitForSelectorAsync(".mermaid"); // Wait for Mermaid to render
+            await page.ScreenshotAsync(outputFilePath, new ScreenshotOptions { FullPage = true });
+        }
+
+        // Clean up the temporary HTML file
+        File.Delete(tempHtmlFile);
+        Console.WriteLine($"Diagram generated at: {outputFilePath}");
+    }
+}
diff --git a/dotnet/src/Experimental/Process.Core/ProcessVisualizationExtensions.cs b/dotnet/src/Experimental/Process.Core/ProcessVisualizationExtensions.cs
@@ -0,0 +1,126 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System;
+using System.Linq;
+using System.Text;
+
+namespace Microsoft.SemanticKernel.Process;
+
+/// <summary>
+/// Provides extension methods to visualize a process as a Mermaid diagram.
+/// </summary>
+public static class ProcessVisualizationExtensions
+{
+    /// <summary>
+    /// Generates a Mermaid diagram from a process builder.
+    /// </summary>
+    /// <param name="processBuilder"></param>
+    /// <returns></returns>
+    public static string ToMermaid(this ProcessBuilder processBuilder)
+    {
+        var process = processBuilder.Build();
+        return process.ToMermaid();
+    }
+
+    /// <summary>
+    /// Generates a Mermaid diagram from a kernel process.
+    /// </summary>
+    /// <param name="process"></param>
+    /// <returns></returns>
+    public static string ToMermaid(this KernelProcess process)
+    {
+        StringBuilder sb = new();
+        sb.AppendLine("flowchart LR");
+        //sb.AppendLine("graph LR");
+
+        // Generate the Mermaid flowchart content with indentation
+        string flowchartContent = GenerateMermaidFlowchart(process);
+
+        // Append the formatted content to the main StringBuilder
+        sb.Append(flowchartContent);
+
+        return sb.ToString();
+    }
+
+    /// <summary>
+    /// Generates the Mermaid graph for a given process.
+    /// </summary>
+    /// <param name="process"></param>
+    /// <returns></returns>
+    private static string GenerateMermaidFlowchart(KernelProcess process)
+    {
+        StringBuilder sb = new();
+        string indentation = new(' ', 4);
+
+        // Dictionary to map step IDs to step names
+        var stepNames = process.Steps
+            .Where(step => step.State.Id != null && step.State.Name != null)
+            .ToDictionary(
+                step => step.State.Id!,
+                step => step.State.Name!
+                );
+
+        // Add Start and End nodes with proper Mermaid styling
+        sb.AppendLine($"{indentation}Start[Start]");
+        sb.AppendLine($"{indentation}End[End]");
+
+        // Handle all edges without a predefined "Start"
+        foreach (var kvp in process.Edges)
+        {
+            var stepId = kvp.Key;
+            var edges = kvp.Value;
+
+            foreach (var edge in edges)
+            {
+                string targetStepName = stepNames[edge.OutputTarget.StepId];
+
+                // Link edges without a specific preceding step to the Start node
+                if (!process.Steps.Any(s => s.Edges.ContainsKey(stepId)))
+                {
+                    sb.AppendLine($"{indentation}Start[Start] --> {targetStepName}[{targetStepName}]");
+                }
+            }
+        }
+
+        // Process each step
+        foreach (var step in process.Steps)
+        {
+            var stepId = step.State.Id;
+            var stepName = step.State.Name;
+
+            // Handle edges from this step
+            if (step.Edges != null)
+            {
+                foreach (var kvp in step.Edges)
+                {
+                    var eventId = kvp.Key;
+                    var stepEdges = kvp.Value;
+
+                    foreach (var edge in stepEdges)
+                    {
+                        string source = $"{stepName}[{stepName}]";
+                        string target;
+
+                        // Check if the target step is the end node by function name
+                        if (edge.OutputTarget.FunctionName.Equals(
+                            "end",
+                            StringComparison.OrdinalIgnoreCase))
+                        {
+                            target = "End[End]";
+                        }
+                        else
+                        {
+                            string targetStepName = stepNames[edge.OutputTarget.StepId];
+                            target = $"{targetStepName}[{targetStepName}]";
+                        }
+
+                        // Append the connection without showing IDs
+                        sb.AppendLine($"{indentation}{source} --> {target}");
+                    }
+                }
+            }
+        }
+
+        return sb.ToString();
+    }
+}