FileFlower

NuGet Packages

Overview

FileFlower is a lightweight, flexible .NET library that enables event-driven, pipeline-based processing of file system changes. Designed for building modular workflows around directory watching, FileFlower lets you:

• React to file creation, modification, deletion events
• Filter and route files by patterns and extensions
• Define processing pipelines with pre- and post-steps
• Easily chain multiple processors in a clean, reusable way

FileFlower is ideal for building file ingestion services, automated workflows, and data pipelines that work with file systems in a reactive and maintainable manner.

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Features

• Monitor directories and subdirectories for file changes
• Filter files by pattern, extension, or custom rules
• Define composable pipeline steps for processing files
• Minimal dependencies, cross-platform (.NET 8+)

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Getting Started

builder.Services.AddFileWatchers(configuration =>
{
    configuration.ForDirectory("./incoming/", watcher =>
    {
        watcher.WhenResourceCreated(rule => rule.Filter("*.txt").Filter("*.csv").WithOrLogic())
               .AddStep(async context =>
               {
                   Console.WriteLine($"CLIENT | Processed txt or csv: {context.FileInfo.FullName}");
               });
    });

    configuration.ForDirectory("./incoming_v2/", watcher =>
    {
        watcher.WhenResourceCreated(rule => rule.Filter("*.txt").Filter("*.csv").WithOrLogic())
               .AddStep(async context =>
               {
                   Console.WriteLine($"CLIENT | Processed txt or csv: {context.FileInfo.FullName}");
               });

        watcher.WhenResourceDeleted(rule => rule.Filter("*.txt"))
               .AddStep(async context =>
               {
                   Console.WriteLine($"CLIENT | Processed txt or csv (deleted): {context.FileInfo.FullName}");
               });
    });
}).AddFileWatcherHostedService();

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How to Create and Deploy a NuGet Package

Follow these steps to create, version, and deploy your NuGet package for FileFlower projects:

1. Add your code changes
   Make all necessary code updates or feature additions in your local branch.

2. Increase the NuGet version
   Update the version number inside the Directory.Build.props file to reflect your new release.

3. Update the changelog
   Add a version description to the CHANGELOG.md file under each NuGet project, documenting your changes.

4. (Optional) Update the README
   Modify the README.md under each NuGet project if you want to update usage instructions or examples.

5. Create a pull request
   Push your changes and create a pull request targeting the master branch.

6. Merge and tag
   After your PR is merged to master, create a Git tag on GitHub corresponding to the new NuGet package version (e.g., v1.2.3).

7. Wait for deployment
   The CI/CD pipeline will automatically build and deploy the package to the NuGet feed. Wait until the package is available on nuget.org.

8. Update the NuGet API key (every 3 months)
   For security, update the NuGet API key periodically (once every three months) in your CI/CD environment to maintain deployment access.