internal static void SetDummyResponseWithUrl(WebException w, LazyUri url, HttpStatusCode statusCode)
{
#if DESKTOP
if (w != null && url != null && w.Response == null)
{
var respfield = typeof(WebException).GetField("response", BindingFlags.Instance | BindingFlags.NonPublic); // m_Response on netfx
if (respfield == null)
{
return;
}
#if CORECLR
Sanity.NotImplementedButTryToContinue();
return;
#else
var response = FormatterServices.GetUninitializedObject(typeof(HttpWebResponse));
var uriField = typeof(HttpWebResponse).GetField("uri", BindingFlags.Instance | BindingFlags.NonPublic); // m_Uri on netfx
if (uriField == null)
{
return;
}
var statusField = typeof(HttpWebResponse).GetField("statusCode", BindingFlags.Instance | BindingFlags.NonPublic); // m_StatusCode on netfx
if (statusField == null)
{
return;
}
statusField.SetValue(response, statusCode);
uriField.SetValue(response, url.Url);
respfield.SetValue(w, response);
#endif
}
#endif
}
internal static string GetPrefetchedFilePath(LazyUri url, bool checkExistence)
{
if (Caching.AzureApi != null)
{
Sanity.NotImplemented();
}
var path = Caching.GetFileCachePath(url);
if (checkExistence)
{
if (!BlobStore.Exists(path))
{
return(null);
}
if (BlobStore.GetLength(path) == 0)
{
if (BlobStore.Exists(Path.ChangeExtension(path, ".err")))
{
return(null);
}
}
}
return(path);
}
public int TryReadFromCache(
int position,
byte[] buffer,
int bufferOffset,
int count,
bool readFully
)
{
maxRequestedByte = Math.Max(maxRequestedByte, position + count);
if (error != null)
{
throw error;
}
if (size.HasValue && position == size.Value)
{
return(0);
}
var avail = Interlocked.Read(ref availableBytes);
if (position >= avail)
{
return(-1);
}
var slot = (int)(position / SlotSize);
var offset = (int)(position % SlotSize);
var slotFirstMissing = (int)(avail / SlotSize);
var offsetFirstMissing = (int)(avail % SlotSize);
var actualBytes = Math.Min(count, SlotSize - offset);
if (slot == slotFirstMissing)
{
actualBytes = Math.Min(actualBytes, offsetFirstMissing - offset);
}
if (readFully && actualBytes != count && !completed)
{
return(-1);
}
var slotData = data[slot];
if (slotData == null)
{
throw new Exception("The requested data interval has been discarded and is no longer available.");
}
Buffer.BlockCopy(slotData, offset, buffer, bufferOffset, actualBytes);
Sanity.Assert(actualBytes >= 0);
return(actualBytes);
}
internal void NotifyConsumerRemoved(int id, bool linger)
{
lock (syncObj)
{
var newCount = consumers--;
Sanity.Assert(newCount >= 0);
mediaStreams[id] = null;
if (newCount == 0)
{
disposalCancellation = new CancellationTokenSource();
DelayedDisposalAsync(disposalCancellation.Token, false, linger);
}
}
}
public static async Task RetryFailedRequestsAsync()
{
await GetCachedResponses().ForEachThrottledAsync(async item =>
{
var c = TryReadCacheFile(item.Value, true);
if (c != null && c.ExceptionType != null)
{
DeleteWebCache(item.Key);
try
{
var dummy = await item.Key.GetHtmlNodeAsync();
}
catch (Exception ex)
{
Sanity.ReportError(ex, ErrorCategory.CacheRetry);
}
}
}
, Configuration_RetryFailedRequestsConcurrency);
}
internal static void SaveCache(string cachePath, WebCache webCache)
{
if (cachePath == null || webCache == null)
{
return;
}
using (var stream = BlobStore.OpenWrite(cachePath))
{
using (var gz = new GZipStream2(stream, CompressionMode.Compress))
using (var bw = new BinaryWriter(gz, Encoding.UTF8))
{
Sanity.AssertFastWriteByte(gz.BaseStream);
bw.Write((byte)52);
bw.WriteNullableString(webCache.ContentType);
bw.Write(webCache.DateRetrieved.Ticks);
bw.Write(webCache.ErrorCode);
bw.WriteNullableString(webCache.ExceptionMessage);
bw.WriteNullableString(webCache.ExceptionType);
bw.Write(webCache.Headers != null ? webCache.Headers.Count : 0);
if (webCache.Headers != null)
{
foreach (var item in webCache.Headers)
{
bw.Write(item.Key);
bw.Write(item.Value);
}
}
bw.Write(webCache.Cookies != null ? webCache.Cookies.Count : 0);
if (webCache.Cookies != null)
{
foreach (var item in webCache.Cookies)
{
bw.Write(item.Key);
bw.Write(item.Value);
}
}
bw.Write((byte)webCache.DataType);
bw.WriteNullableString(webCache.RedirectUrl != null ? webCache.RedirectUrl.AbsoluteUri : null);
bw.WriteNullableString(webCache.Url != null ? webCache.Url.AbsoluteUri : null);
bw.WriteNullableString(webCache.Result);
bw.WriteNullableString(webCache.JsExecutionResults);
bw.WriteNullableString(webCache.PageUrl?.AbsoluteUri);
}
}
if (lastFlush == null)
{
lastFlush = Stopwatch.StartNew();
}
else if (lastFlush.ElapsedMilliseconds > Configuration_FlushIntervalMs)
{
BlobStore.FlushDirectory(Path.GetDirectoryName(cachePath));
#if NET35
lastFlush.Stop();
lastFlush.Start();
#else
lastFlush.Restart();
#endif
}
}
internal static WebCache TryReadCacheFile(string path, bool onlyIfFailed = false, bool fromFileSystem = false)
{
#if STANDALONE
HttpUtils.EnsureInitialized();
#else
Utils.EnsureInitialized();
#endif
Stream stream;
if (fromFileSystem)
{
if (!File.Exists(path))
{
return(null);
}
try
{
stream = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.Delete | FileShare.Read);
}
catch (FileNotFoundException)
{
return(null);
}
}
else
{
if (!BlobStore.Exists(path))
{
return(null);
}
try
{
stream = BlobStore.OpenRead(path);
}
catch (FileNotFoundException)
{
return(null);
}
}
Sanity.AssertFastReadByte(stream);
using (stream)
{
var q = stream.ReadByte();
if (q == 0xEF)
{
stream.ReadByte();
stream.ReadByte();
using (var sr = new StreamReader(stream, Encoding.UTF8))
{
var qq = JsonConvert.DeserializeObject <WebCache>(sr.ReadToEnd());
stream.Dispose();
SaveCache(path, qq);
return(qq);
}
}
if (q != 0x1F)
{
throw new ArgumentException("Invalid cache file.");
}
stream.Seek(0, SeekOrigin.Begin);
var gz = new GZipStream2(stream, CompressionMode.Decompress);
q = gz.ReadByte();
if (q < 50 || q > 80)
{
throw new ArgumentException("Invalid cache file.");
}
using (var br = new BinaryReader(gz, Encoding.UTF8))
{
Sanity.AssertFastReadByte(br.BaseStream);
var cache = new WebCache();
cache.ContentType = br.ReadNullableString();
cache.DateRetrieved = new DateTime(br.ReadInt64(), DateTimeKind.Utc);
cache.ErrorCode = br.ReadInt32();
cache.ExceptionMessage = br.ReadNullableString();
cache.ExceptionType = br.ReadNullableString();
if (onlyIfFailed && cache.ExceptionType == null)
{
return(null);
}
var headerCount = br.ReadInt32();
cache.Headers = new Dictionary <string, string>(headerCount);
for (int i = 0; i < headerCount; i++)
{
var name = br.ReadString();
var value = br.ReadString();
cache.Headers[name] = value;
}
var cookieCount = br.ReadInt32();
cache.Cookies = new Dictionary <string, string>(cookieCount);
for (int i = 0; i < cookieCount; i++)
{
var name = br.ReadString();
var value = br.ReadString();
cache.Cookies[name] = value;
}
cache.DataType = (WebCacheDataType)br.ReadByte();
cache.RedirectUrl = br.ReadNullableString()?.AsLazyUri();
var p = br.ReadNullableString();
cache.Url = p != null ? new LazyUri(p) : null;
cache.Result = br.ReadNullableString();
if (q >= 51)
{
cache.JsExecutionResults = br.ReadNullableString();
if (q >= 52)
{
var pp = br.ReadNullableString();
cache.PageUrl = pp != null ? new LazyUri(pp) : null;
}
}
return(cache);
}
}
}
internal void PopulateHeaders(HtmlDocument doc)
{
throw Sanity.NotImplemented();
}
private async Task <HttpResponseMessage> SendAsyncInternal(HttpRequestMessage request, CancellationToken cancellationToken)
{
if (disposed)
{
throw new ObjectDisposedException(nameof(CurlWarcHandler));
}
if (request.Properties.TryGetValue("ShamanURL", out var shamanUrlObj) && shamanUrlObj is LazyUri shamanUrl)
{
shamanUrl.RemoveFragmentParameter("$assume-text");
request.Properties["ShamanURL"] = shamanUrl;
}
if (TryGetCached != null)
{
var cached = TryGetCached(request);
if (cached != null)
{
return(cached);
}
else
{
}
}
CurlEasy easy = null;
MemoryStream requestMs = null;
MemoryStream responseMs = null;
lock (lockObj)
{
easy = BorrowPooled(pooledEasyHandles);
requestMs = BorrowPooled(pooledRequestMemoryStreams);
responseMs = BorrowPooled(pooledResponseMemoryStreams);
}
Sanity.Assert(requestMs != null);
var response = new HttpResponseMessage();
var(httpCode, curlCode, warcItem) = await WebsiteScraper.ScrapeAsync(easy, request, request.RequestUri.AbsoluteUri, requestMs, responseMs, ea =>
{
return(GetDestinationWarc(request.RequestUri, easy, requestMs, responseMs));
}, syncObj, cancellationToken);
if (curlCode != CurlCode.Ok)
{
Release(easy, requestMs, responseMs);
throw new WebException("Curl: " + curlCode, (WebExceptionStatus)(800 + curlCode));
}
responseMs.Seek(0, SeekOrigin.Begin);
var httpResponse = new Utf8StreamReader(responseMs);
response.RequestMessage = request;
response.StatusCode = httpCode;
using (var scratchpad = new Scratchpad())
{
var stream = WarcItem.OpenHttp(httpResponse, scratchpad, request.RequestUri, responseMs.Length, out long payloadLength, out var _, out var _, out var contentType, out var _, (key, val) =>
{
response.Headers.TryAddWithoutValidation(key.ToString(), val.ToString());
});
response.Content = new System.Net.Http.StreamContent(new DisposeCallbackStream(stream, () =>
{
Release(easy, requestMs, responseMs);
}));
}
OnResponseReceived?.Invoke(response, easy, requestMs, responseMs);
return(response);
}
