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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "net/tools/quic/quic_spdy_server_stream.h"
      6 
      7 #include "base/memory/singleton.h"
      8 #include "net/quic/quic_session.h"
      9 #include "net/spdy/spdy_framer.h"
     10 #include "net/tools/quic/quic_in_memory_cache.h"
     11 #include "net/tools/quic/spdy_utils.h"
     12 
     13 using base::StringPiece;
     14 using std::string;
     15 
     16 namespace net {
     17 namespace tools {
     18 
     19 static const size_t kHeaderBufInitialSize = 4096;
     20 
     21 QuicSpdyServerStream::QuicSpdyServerStream(QuicStreamId id,
     22                                            QuicSession* session)
     23     : QuicDataStream(id, session),
     24       read_buf_(new GrowableIOBuffer()),
     25       request_headers_received_(false) {
     26 }
     27 
     28 QuicSpdyServerStream::~QuicSpdyServerStream() {
     29 }
     30 
     31 uint32 QuicSpdyServerStream::ProcessData(const char* data, uint32 length) {
     32   uint32 total_bytes_processed = 0;
     33 
     34   // Are we still reading the request headers.
     35   if (!request_headers_received_) {
     36     // Grow the read buffer if necessary.
     37     if (read_buf_->RemainingCapacity() < (int)length) {
     38       read_buf_->SetCapacity(read_buf_->capacity() + kHeaderBufInitialSize);
     39     }
     40     memcpy(read_buf_->data(), data, length);
     41     read_buf_->set_offset(read_buf_->offset() + length);
     42     ParseRequestHeaders();
     43   } else {
     44     body_.append(data + total_bytes_processed, length - total_bytes_processed);
     45   }
     46   return length;
     47 }
     48 
     49 void QuicSpdyServerStream::OnFinRead() {
     50   ReliableQuicStream::OnFinRead();
     51   if (write_side_closed() || fin_buffered()) {
     52     return;
     53   }
     54 
     55   if (!request_headers_received_) {
     56     SendErrorResponse();  // We're not done reading headers.
     57   } else if ((headers_.content_length_status() ==
     58              BalsaHeadersEnums::VALID_CONTENT_LENGTH) &&
     59              body_.size() != headers_.content_length()) {
     60     SendErrorResponse();  // Invalid content length
     61   } else {
     62     SendResponse();
     63   }
     64 }
     65 
     66 int QuicSpdyServerStream::ParseRequestHeaders() {
     67   size_t read_buf_len = static_cast<size_t>(read_buf_->offset());
     68   SpdyFramer framer(SPDY3);
     69   SpdyHeaderBlock headers;
     70   char* data = read_buf_->StartOfBuffer();
     71   size_t len = framer.ParseHeaderBlockInBuffer(data, read_buf_->offset(),
     72                                                &headers);
     73   if (len == 0) {
     74     return -1;
     75   }
     76 
     77   if (!SpdyUtils::FillBalsaRequestHeaders(headers, &headers_)) {
     78     SendErrorResponse();
     79     return -1;
     80   }
     81 
     82   size_t delta = read_buf_len - len;
     83   if (delta > 0) {
     84     body_.append(data + len, delta);
     85   }
     86 
     87   request_headers_received_ = true;
     88   return len;
     89 }
     90 
     91 void QuicSpdyServerStream::SendResponse() {
     92   // Find response in cache. If not found, send error response.
     93   const QuicInMemoryCache::Response* response =
     94       QuicInMemoryCache::GetInstance()->GetResponse(headers_);
     95   if (response == NULL) {
     96     SendErrorResponse();
     97     return;
     98   }
     99 
    100   DLOG(INFO) << "Sending response for stream " << id();
    101   SendHeadersAndBody(response->headers(), response->body());
    102 }
    103 
    104 void QuicSpdyServerStream::SendErrorResponse() {
    105   DLOG(INFO) << "Sending error response for stream " << id();
    106   BalsaHeaders headers;
    107   headers.SetResponseFirstlineFromStringPieces(
    108       "HTTP/1.1", "500", "Server Error");
    109   headers.ReplaceOrAppendHeader("content-length", "3");
    110   SendHeadersAndBody(headers, "bad");
    111 }
    112 
    113 void QuicSpdyServerStream:: SendHeadersAndBody(
    114     const BalsaHeaders& response_headers,
    115     StringPiece body) {
    116   // We only support SPDY and HTTP, and neither handles bidirectional streaming.
    117   if (!read_side_closed()) {
    118     CloseReadSide();
    119   }
    120 
    121   SpdyHeaderBlock header_block =
    122       SpdyUtils::ResponseHeadersToSpdyHeaders(response_headers);
    123 
    124   string headers_string =
    125       session()->compressor()->CompressHeaders(header_block);
    126     WriteOrBufferData(headers_string, body.empty());
    127 
    128   if (!body.empty()) {
    129     WriteOrBufferData(body, true);
    130   }
    131 }
    132 
    133 }  // namespace tools
    134 }  // namespace net
    135