blob: 4bfced670ee3409e00c93586a34284846c166e12 [file] [log] [blame]
#include "http2/adapter/nghttp2_util.h"
#include <cstdint>
#include "absl/strings/str_join.h"
#include "absl/strings/string_view.h"
#include "absl/types/span.h"
#include "http2/adapter/http2_protocol.h"
#include "third_party/nghttp2/src/lib/includes/nghttp2/nghttp2.h"
#include "common/platform/api/quiche_logging.h"
#include "common/quiche_endian.h"
namespace http2 {
namespace adapter {
namespace {
void DeleteCallbacks(nghttp2_session_callbacks* callbacks) {
if (callbacks) {
nghttp2_session_callbacks_del(callbacks);
}
}
void DeleteSession(nghttp2_session* session) {
if (session) {
nghttp2_session_del(session);
}
}
} // namespace
nghttp2_session_callbacks_unique_ptr MakeCallbacksPtr(
nghttp2_session_callbacks* callbacks) {
return nghttp2_session_callbacks_unique_ptr(callbacks, &DeleteCallbacks);
}
nghttp2_session_unique_ptr MakeSessionPtr(nghttp2_session* session) {
return nghttp2_session_unique_ptr(session, &DeleteSession);
}
uint8_t* ToUint8Ptr(char* str) { return reinterpret_cast<uint8_t*>(str); }
uint8_t* ToUint8Ptr(const char* str) {
return const_cast<uint8_t*>(reinterpret_cast<const uint8_t*>(str));
}
absl::string_view ToStringView(nghttp2_rcbuf* rc_buffer) {
nghttp2_vec buffer = nghttp2_rcbuf_get_buf(rc_buffer);
return absl::string_view(reinterpret_cast<const char*>(buffer.base),
buffer.len);
}
absl::string_view ToStringView(uint8_t* pointer, size_t length) {
return absl::string_view(reinterpret_cast<const char*>(pointer), length);
}
absl::string_view ToStringView(const uint8_t* pointer, size_t length) {
return absl::string_view(reinterpret_cast<const char*>(pointer), length);
}
std::vector<nghttp2_nv> GetNghttp2Nvs(absl::Span<const Header> headers) {
const int num_headers = headers.size();
std::vector<nghttp2_nv> nghttp2_nvs;
nghttp2_nvs.reserve(num_headers);
for (int i = 0; i < num_headers; ++i) {
nghttp2_nv header;
uint8_t flags = NGHTTP2_NV_FLAG_NONE;
const auto [name, no_copy_name] = GetStringView(headers[i].first);
header.name = ToUint8Ptr(name.data());
header.namelen = name.size();
if (no_copy_name) {
flags |= NGHTTP2_NV_FLAG_NO_COPY_NAME;
}
const auto [value, no_copy_value] = GetStringView(headers[i].second);
header.value = ToUint8Ptr(value.data());
header.valuelen = value.size();
if (no_copy_value) {
flags |= NGHTTP2_NV_FLAG_NO_COPY_VALUE;
}
header.flags = flags;
nghttp2_nvs.push_back(std::move(header));
}
return nghttp2_nvs;
}
std::vector<nghttp2_nv> GetResponseNghttp2Nvs(
const spdy::Http2HeaderBlock& headers,
absl::string_view response_code) {
// Allocate enough for all headers and also the :status pseudoheader.
const int num_headers = headers.size();
std::vector<nghttp2_nv> nghttp2_nvs;
nghttp2_nvs.reserve(num_headers + 1);
// Add the :status pseudoheader first.
nghttp2_nv status;
status.name = ToUint8Ptr(kHttp2StatusPseudoHeader);
status.namelen = strlen(kHttp2StatusPseudoHeader);
status.value = ToUint8Ptr(response_code.data());
status.valuelen = response_code.size();
status.flags = NGHTTP2_FLAG_NONE;
nghttp2_nvs.push_back(std::move(status));
// Add the remaining headers.
for (const auto& header_pair : headers) {
nghttp2_nv header;
header.name = ToUint8Ptr(header_pair.first.data());
header.namelen = header_pair.first.size();
header.value = ToUint8Ptr(header_pair.second.data());
header.valuelen = header_pair.second.size();
header.flags = NGHTTP2_FLAG_NONE;
nghttp2_nvs.push_back(std::move(header));
}
return nghttp2_nvs;
}
Http2ErrorCode ToHttp2ErrorCode(uint32_t wire_error_code) {
if (wire_error_code > static_cast<int>(Http2ErrorCode::MAX_ERROR_CODE)) {
return Http2ErrorCode::INTERNAL_ERROR;
}
return static_cast<Http2ErrorCode>(wire_error_code);
}
class Nghttp2DataFrameSource : public DataFrameSource {
public:
Nghttp2DataFrameSource(nghttp2_data_provider provider,
nghttp2_send_data_callback send_data,
void* user_data)
: provider_(std::move(provider)),
send_data_(std::move(send_data)),
user_data_(user_data) {}
std::pair<int64_t, bool> SelectPayloadLength(size_t max_length) override {
const int32_t stream_id = 0;
uint32_t data_flags = 0;
int64_t result = provider_.read_callback(
nullptr /* session */, stream_id, nullptr /* buf */, max_length,
&data_flags, &provider_.source, nullptr /* user_data */);
if (result == NGHTTP2_ERR_DEFERRED) {
return {kBlocked, false};
} else if (result < 0) {
return {kError, false};
} else if ((data_flags & NGHTTP2_DATA_FLAG_NO_COPY) == 0) {
QUICHE_LOG(ERROR) << "Source did not use the zero-copy API!";
return {kError, false};
} else {
if (data_flags & NGHTTP2_DATA_FLAG_NO_END_STREAM) {
send_fin_ = false;
}
const bool eof = data_flags & NGHTTP2_DATA_FLAG_EOF;
return {result, eof};
}
}
bool Send(absl::string_view frame_header, size_t payload_length) override {
nghttp2_frame frame;
frame.hd.type = 0;
frame.hd.length = payload_length;
frame.hd.flags = 0;
frame.hd.stream_id = 0;
frame.data.padlen = 0;
const int result = send_data_(
nullptr /* session */, &frame, ToUint8Ptr(frame_header.data()),
payload_length, &provider_.source, user_data_);
QUICHE_LOG_IF(ERROR, result < 0 && result != NGHTTP2_ERR_WOULDBLOCK)
<< "Unexpected error code from send: " << result;
return result == 0;
}
bool send_fin() const override { return send_fin_; }
private:
nghttp2_data_provider provider_;
nghttp2_send_data_callback send_data_;
void* user_data_;
bool send_fin_ = true;
};
std::unique_ptr<DataFrameSource> MakeZeroCopyDataFrameSource(
nghttp2_data_provider provider,
void* user_data,
nghttp2_send_data_callback send_data) {
return absl::make_unique<Nghttp2DataFrameSource>(
std::move(provider), std::move(send_data), user_data);
}
absl::string_view ErrorString(uint32_t error_code) {
return Http2ErrorCodeToString(static_cast<Http2ErrorCode>(error_code));
}
size_t PaddingLength(uint8_t flags, size_t padlen) {
return (flags & 0x8 ? 1 : 0) + padlen;
}
struct NvFormatter {
void operator()(std::string* out, const nghttp2_nv& nv) {
absl::StrAppend(out, ToStringView(nv.name, nv.namelen), ": ",
ToStringView(nv.value, nv.valuelen));
}
};
std::string NvsAsString(nghttp2_nv* nva, size_t nvlen) {
return absl::StrJoin(absl::MakeConstSpan(nva, nvlen), ", ", NvFormatter());
}
#define HTTP2_FRAME_SEND_LOG QUICHE_VLOG(1)
void LogBeforeSend(const nghttp2_frame& frame) {
switch (static_cast<FrameType>(frame.hd.type)) {
case FrameType::DATA:
HTTP2_FRAME_SEND_LOG << "Sending DATA on stream " << frame.hd.stream_id
<< " with length "
<< frame.hd.length - PaddingLength(frame.hd.flags,
frame.data.padlen)
<< " and padding "
<< PaddingLength(frame.hd.flags, frame.data.padlen);
break;
case FrameType::HEADERS:
HTTP2_FRAME_SEND_LOG << "Sending HEADERS on stream " << frame.hd.stream_id
<< " with headers ["
<< NvsAsString(frame.headers.nva,
frame.headers.nvlen)
<< "]";
break;
case FrameType::PRIORITY:
HTTP2_FRAME_SEND_LOG << "Sending PRIORITY";
break;
case FrameType::RST_STREAM:
HTTP2_FRAME_SEND_LOG << "Sending RST_STREAM on stream "
<< frame.hd.stream_id << " with error code "
<< ErrorString(frame.rst_stream.error_code);
break;
case FrameType::SETTINGS:
HTTP2_FRAME_SEND_LOG << "Sending SETTINGS with " << frame.settings.niv
<< " entries, is_ack: " << (frame.hd.flags & 0x01);
break;
case FrameType::PUSH_PROMISE:
HTTP2_FRAME_SEND_LOG << "Sending PUSH_PROMISE";
break;
case FrameType::PING: {
Http2PingId ping_id;
std::memcpy(&ping_id, frame.ping.opaque_data, sizeof(Http2PingId));
HTTP2_FRAME_SEND_LOG << "Sending PING with unique_id "
<< quiche::QuicheEndian::NetToHost64(ping_id)
<< ", is_ack: " << (frame.hd.flags & 0x01);
break;
}
case FrameType::GOAWAY:
HTTP2_FRAME_SEND_LOG << "Sending GOAWAY with last_stream: "
<< frame.goaway.last_stream_id << " and error "
<< ErrorString(frame.goaway.error_code);
break;
case FrameType::WINDOW_UPDATE:
HTTP2_FRAME_SEND_LOG << "Sending WINDOW_UPDATE on stream "
<< frame.hd.stream_id << " with update delta "
<< frame.window_update.window_size_increment;
break;
case FrameType::CONTINUATION:
HTTP2_FRAME_SEND_LOG << "Sending CONTINUATION, which is unexpected";
break;
}
}
#undef HTTP2_FRAME_SEND_LOG
} // namespace adapter
} // namespace http2