public async Task DownloadAndExtractTS(string dir, string versionString)
{
_logger.Info($"Downloading and extracting TypeScript {versionString}");
var version = new SemVer.Version(versionString);
var npmr = new NpmRepositoryAccessor();
var packageEtagAndContent = await npmr.GetPackageInfo("typescript", null);
var task = null as Task <byte[]>;
try
{
var packageInfo = new PackageInfo(packageEtagAndContent.content);
packageInfo.LazyParseVersions(v => v == version, reader =>
{
var j = PackageJson.Parse(reader);
var tgzName = PathUtils.SplitDirAndFile(j.Dist.Tarball).Item2;
_logger.Info($"Downloading Tarball {tgzName}");
task = npmr.GetPackageTgz("typescript", tgzName);
});
}
catch (Exception)
{
_logger.Error("Failed to parse TypeScript package info: " +
packageEtagAndContent.content.Substring(0,
Math.Min(1000, packageEtagAndContent.content.Length)));
throw;
}
if (task != null)
{
var bytes = await task;
_logger.Info($"Extracting {bytes.Length} bytes");
await TarExtractor.ExtractTgzAsync(bytes, async (name, stream, size) =>
{
if (name.StartsWith("package/"))
{
name = name.Substring("package/".Length);
}
var fn = PathUtils.Join(dir, name);
Directory.CreateDirectory(PathUtils.Parent(fn));
using (var targetStream = File.Create(fn))
{
var buf = new byte[4096];
while (size > 0)
{
var read = await stream.ReadAsync(buf, 0, (int)Math.Min((ulong)buf.Length, size));
if (read == 0)
{
throw new IOException($"Reading {name} failed");
}
await targetStream.WriteAsync(buf, 0, read);
size -= (ulong)read;
}
}
return(true);
});
}
else
{
throw new Exception($"TypeScript version {version} does not exists");
}
}