diff --git a/src/node_http2.cc b/src/node_http2.cc index de7a7f044e28c2..3227ae66a2dead 100644 --- a/src/node_http2.cc +++ b/src/node_http2.cc @@ -1754,11 +1754,7 @@ void Http2Session::OnStreamRead(ssize_t nread, const uv_buf_t& buf_) { statistics_.data_received += nread; - if (LIKELY(stream_buf_offset_ == 0)) { - // Shrink to the actual amount of used data. - buf.Resize(nread); - IncrementCurrentSessionMemory(nread); - } else { + if (UNLIKELY(stream_buf_offset_ > 0)) { // This is a very unlikely case, and should only happen if the ReadStart() // call in OnStreamAfterWrite() immediately provides data. If that does // happen, we concatenate the data we received with the already-stored @@ -1769,20 +1765,20 @@ void Http2Session::OnStreamRead(ssize_t nread, const uv_buf_t& buf_) { memcpy(new_buf.data(), stream_buf_.base + stream_buf_offset_, pending_len); memcpy(new_buf.data() + pending_len, buf.data(), nread); - // The data in stream_buf_ is already accounted for, add nread received - // bytes to session memory but remove the already processed - // stream_buf_offset_ bytes. - // TODO(@jasnell): There are some cases where nread is < stream_buf_offset_ - // here but things still work. Those need to be investigated. - // CHECK_GE(nread, stream_buf_offset_); - IncrementCurrentSessionMemory(nread - stream_buf_offset_); - buf = std::move(new_buf); nread = buf.size(); stream_buf_offset_ = 0; stream_buf_ab_.Reset(); + + // We have now fully processed the stream_buf_ input chunk (by moving the + // remaining part into buf, which will be accounted for below). + DecrementCurrentSessionMemory(stream_buf_.len); } + // Shrink to the actual amount of used data. + buf.Resize(nread); + IncrementCurrentSessionMemory(nread); + // Remember the current buffer, so that OnDataChunkReceived knows the // offset of a DATA frame's data into the socket read buffer. stream_buf_ = uv_buf_init(buf.data(), static_cast(nread));