public async Task <bool> DownloadRepo(string user, string repo, string commitId)
{
var cacheDir = Path.Combine(AppConfiguration["cacheDir"], user, repo, commitId);
//已經有快取項目
if (Directory.Exists(cacheDir))
{
return(true);
}
// 檢查目前是否正在下載中了
lock (DownloadLocker) {
// 沒在下載中
if (!DownloadLocker.ContainsKey(commitId))
{
// 建立lock物件
DownloadLocker[commitId] = new object();
}
}
// 標註正在被locking的數量
lock (Locking) {
if (!Locking.ContainsKey(commitId))
{
Locking[commitId] = 0;
}
Locking[commitId]++;
}
lock (DownloadLocker[commitId]) {
// 如果快取項目，其他request在lock期間已經完成下載
if (!Directory.Exists(cacheDir))
{
var url = $"{AppConfiguration["giteaHost"]}/{user}/{repo}/archive/{commitId}.zip";
HttpClient client = new HttpClient();
Stream downloadStream = null;
try {
downloadStream = client.GetStreamAsync(url).GetAwaiter().GetResult();
} catch { // 無法取得串流
return(false);
}
using (ZipArchive arch = new ZipArchive(downloadStream, ZipArchiveMode.Read, true)) {
arch.ExtractToDirectory(cacheDir, true);
}
}
}
// 解鎖
Locking[commitId]--;
return(true);
}
public PagesController(LiteDatabase database)
{
this.Database = database;
if (LockClear == null)
{
LockClear = Task.Run(() => {
for (; ;)
{
Thread.Sleep(TimeSpan.FromSeconds(30));
lock (Locking) {
var willDelete = Locking.Where(x => x.Value == 0).ToArray();
foreach (var commit in willDelete)
{
DownloadLocker.Remove(commit.Key);
Locking.Remove(commit.Key);
}
}
}
});
}
}
