f8-features-download-workflow

Development

Use when implementing or troubleshooting Download feature workflows — HTTP file downloads, progress tracking, and resumable transfers in F8Framework.

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Download Feature Workflow

⚠️ IMPORTANT: Before using this feature, you MUST formally initialize F8Framework in the launch sequence. Ensure ModuleCenter.Initialize(this); has run first, then create the required module, for example FF8.Download = ModuleCenter.CreateModule<DownloadManager>();.

Use this skill when

The task is about downloading files from HTTP/localhost.
The user needs progress tracking, resumable downloads, or batch downloads.
Troubleshooting download failures or timeout issues.

Path resolution

Prefer project source at Assets/F8Framework.
If F8Framework is installed as a package, use Packages/F8Framework.
For usage docs, read: Assets/F8Framework/Tests/Download/README.md

Sources of truth

Runtime module: Assets/F8Framework/Runtime/Download
Test docs: Assets/F8Framework/Tests/Download

Key classes and interfaces

Class	Role
`DownloadManager`	Core module. Access via `FF8.Download`. Creates and manages downloaders.
`Downloader`	Individual download task manager. Handles queue, callbacks, retry.
`DownloadStartEventArgs`	Event data for download start.
`DonwloadUpdateEventArgs`	Event data for progress updates (Note: naming typo in framework).
`DownloadSuccessEventArgs`	Event data for successful download.
`DownloadFailureEventArgs`	Event data for failed download.
`DownloadTasksCompletedEventArgs`	Event data when all tasks complete.

API quick reference

// Create a downloader instance
Downloader downloader = FF8.Download.CreateDownloader("Download", new Downloader());
downloader.DownloadTimeout = 30;  // Timeout in seconds (default: no timeout)

// Set callbacks
downloader.OnDownloadStart += (DownloadStartEventArgs e) => { };
downloader.OnDownloadSuccess += (DownloadSuccessEventArgs e) => { };
downloader.OnDownloadFailure += (DownloadFailureEventArgs e) => { };
downloader.OnDownloadOverallProgress += (DonwloadUpdateEventArgs e) =>
{
    float progress = (float)e.CurrentDownloadTaskIndex / e.DownloadTaskCount * 100f;
    long downloadedBytes = e.TotalDownloadedLength;
    double speed = e.DownloadInfo.DownloadedLength / e.DownloadInfo.DownloadTimeSpan.TotalSeconds;
    double downloadedMB = downloadedBytes / (1024.0 * 1024.0);
    double speedMB = speed / (1024.0 * 1024.0);
    LogF8.Log(quot;Progress: {progress:F1}%, {downloadedMB:F2}MB, Speed: {speedMB:F2}MB/s");
};
downloader.OnAllDownloadTaskCompleted += (DownloadTasksCompletedEventArgs e) => { };

// Add download tasks
FileInfo file = new FileInfo(Application.persistentDataPath + "/file.png");
long fileSizeInBytes = file.Length;
downloader.AddDownload(url, Application.persistentDataPath + "/file.png", fileSizeInBytes, true);

// Start downloading
downloader.LaunchDownload();

// Cancel download
downloader.CancelDownload();

// Get remote file size
FF8.Download.GetUrlFilesSizeAsync(url, (long size) => LogF8.Log(size));

Workflow

Create a downloader with FF8.Download.CreateDownloader().
Configure timeout if needed.
Register all callbacks before adding tasks.
If you need resume support, read the local file size and pass it as downloadByteOffset, with downloadAppend = true.
Add download items with source URL and local save path.
Call LaunchDownload() to begin.
Monitor progress via OnDownloadOverallProgress; use e.TotalDownloadedLength for accumulated bytes and e.DownloadInfo.DownloadedLength for the current file.
Handle success/failure per file.
Use GetUrlFilesSizeAsync() only when you need to query remote file size separately.
Cancel with CancelDownload() if needed.

Common error handling

Error	Cause	Solution
Download timeout	Server slow or unreachable	Increase `DownloadTimeout` or check network
File write fails	Invalid save path or no permission	Ensure path is in `Application.persistentDataPath`
Progress shows 0%	Some servers don't provide Content-Length	Use task index ratio instead of byte-based progress
Resume not working	Server doesn't support Range headers	Check server configuration
Overall bytes only show current file	Using wrong event field	Use `e.TotalDownloadedLength` instead of `e.DownloadInfo.DownloadedLength`

Cross-module dependencies

HotUpdateManager: Uses Download for hot update asset retrieval.
AssetManager: Downloaded assets may need to be loaded via AssetManager.

Output checklist

Downloader created with appropriate callbacks.
Download paths verified.
Files changed and why.
Validation status and remaining risks.