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arangodb/arangod/GeneralServer/VstCommTask.cpp

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////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2019 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
/// http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Jan Christoph Uhde
/// @author Simon Grätzer
////////////////////////////////////////////////////////////////////////////////
#include "VstCommTask.h"
#include "Basics/HybridLogicalClock.h"
#include "Basics/Result.h"
#include "Basics/ScopeGuard.h"
#include "Basics/VelocyPackHelper.h"
#include "Basics/tryEmplaceHelper.h"
#include "Cluster/ServerState.h"
#include "GeneralServer/AuthenticationFeature.h"
#include "GeneralServer/GeneralServer.h"
#include "GeneralServer/GeneralServerFeature.h"
#include "GeneralServer/RestHandler.h"
#include "Logger/LogMacros.h"
#include "Logger/Logger.h"
#include "Logger/LoggerFeature.h"
#include "Logger/LoggerStream.h"
#include "Meta/conversion.h"
#include "RestServer/ServerFeature.h"
#include "Statistics/ConnectionStatistics.h"
#include "Statistics/RequestStatistics.h"
#include <velocypack/Options.h>
#include <velocypack/Validator.h>
#include <velocypack/velocypack-aliases.h>
using namespace arangodb;
using namespace arangodb::basics;
using namespace arangodb::rest;
template<SocketType T>
VstCommTask<T>::VstCommTask(GeneralServer& server,
ConnectionInfo info,
std::unique_ptr<AsioSocket<T>> so,
fuerte::vst::VSTVersion v)
: GeneralCommTask<T>(server, "VstCommTask", std::move(info), std::move(so)),
_writing(false),
_authorized(!this->_auth->isActive()),
_authMethod(rest::AuthenticationMethod::NONE),
_vstVersion(v) {}
template<SocketType T>
VstCommTask<T>::~VstCommTask() {
ResponseItem* tmp = nullptr;
while (_writeQueue.pop(tmp)) {
delete tmp;
}
}
/// @brief send simple response including response body
template<SocketType T>
void VstCommTask<T>::addSimpleResponse(rest::ResponseCode code,
rest::ContentType respType, uint64_t messageId,
velocypack::Buffer<uint8_t>&& buffer) {
auto resp = std::make_unique<VstResponse>(code, messageId);
TRI_ASSERT(respType == rest::ContentType::VPACK); // or not ?
resp->setContentType(respType);
try {
if (!buffer.empty()) {
resp->setPayload(std::move(buffer), true, VPackOptions::Defaults);
}
sendResponse(std::move(resp), this->stealStatistics(messageId));
} catch (...) {
this->close();
}
}
template <SocketType T>
bool VstCommTask<T>::readCallback(asio_ns::error_code ec) {
using namespace fuerte;
if (ec) {
if (ec != asio_ns::error::misc_errors::eof) {
LOG_TOPIC("495fe", INFO, Logger::REQUESTS)
<< "Error while reading from socket: '" << ec.message() << "'";
}
this->close();
return false;
}
// Inspect the data we've received so far.
auto recvBuffs = this->_protocol->buffer.data(); // no copy
auto cursor = asio_ns::buffer_cast<const uint8_t*>(recvBuffs);
auto available = asio_ns::buffer_size(recvBuffs);
// TODO technically buffer_cast is deprecated
size_t parsedBytes = 0;
while (true) {
vst::Chunk chunk;
vst::parser::ChunkState state = vst::parser::ChunkState::Invalid;
if (_vstVersion == vst::VST1_1) {
state = vst::parser::readChunkVST1_1(chunk, cursor, available);
} else if (_vstVersion == vst::VST1_0) {
state = vst::parser::readChunkVST1_0(chunk, cursor, available);
}
if (vst::parser::ChunkState::Incomplete == state) {
break;
} else if (vst::parser::ChunkState::Invalid == state) { // actually should never happen
this->close();
return false; // stop read loop
}
// move cursors
cursor += chunk.header.chunkLength();
available -= chunk.header.chunkLength();
parsedBytes += chunk.header.chunkLength();
// Process chunk
if (!processChunk(chunk)) {
this->close();
return false; // stop read loop
}
}
// Remove consumed data from receive buffer.
this->_protocol->buffer.consume(parsedBytes);
return true; // continue read loop
}
// Process the given incoming chunk.
template<SocketType T>
bool VstCommTask<T>::processChunk(fuerte::vst::Chunk const& chunk) {
if (chunk.body.size() > CommTask::MaximalBodySize) {
LOG_TOPIC("695ef", WARN, Logger::REQUESTS)
<< "\"vst-request\"; chunk is too big for server, \"" << chunk.body.size()
<< "\", this=" << this;
return false; // close connection
} else if (chunk.body.size() == 0) {
LOG_TOPIC("695ff", WARN, Logger::REQUESTS)
<< "\"vst-request\"; chunk was empty, this=" << this;
return false; // close connection
}
if (chunk.header.isFirst()) {
RequestStatistics* stat = this->acquireStatistics(chunk.header.messageID());
RequestStatistics::SET_READ_START(stat, TRI_microtime());
// single chunk optimization
if (chunk.header.numberOfChunks() == 1) {
VPackBuffer<uint8_t> buffer; // TODO lease buffers ?
buffer.append(reinterpret_cast<uint8_t const*>(chunk.body.data()),
chunk.body.size());
return processMessage(std::move(buffer), chunk.header.messageID());
}
}
// Find stored message for this chunk.
auto it = _messages.try_emplace(
chunk.header.messageID(),
arangodb::lazyConstruct([&]{
return std::make_unique<Message>();
})).first;
Message* msg = it->second.get();
// returns false if message gets too big
if (!msg->addChunk(chunk)) {
LOG_TOPIC("695fd", WARN, Logger::REQUESTS)
<< "\"vst-request\"; chunk contents have become larger than "
<< "allowed, this=" << this;
return false; // close connection
}
if (!msg->assemble()) {
return true; // wait for more chunks
}
//this->_proto->timer.cancel();
auto guard = scopeGuard([&] {
_messages.erase(chunk.header.messageID());
});
return processMessage(std::move(msg->buffer), chunk.header.messageID());
}
/// process a VST message
template<SocketType T>
bool VstCommTask<T>::processMessage(velocypack::Buffer<uint8_t> buffer,
uint64_t messageId) {
using namespace fuerte;
auto ptr = buffer.data();
auto len = buffer.byteSize();
// first part of the buffer contains the response buffer
std::size_t headerLength = 0;
MessageType mt = MessageType::Undefined;
try {
mt = vst::parser::validateAndExtractMessageType(ptr, len, headerLength);
} catch(std::exception const& e) {
LOG_TOPIC("6479a", ERR, Logger::REQUESTS) << "\"vst-request\"; invalid message: '" <<
e.what() << "'";
// error is handled below
}
RequestStatistics* stat = this->statistics(messageId);
RequestStatistics::SET_READ_END(stat);
RequestStatistics::ADD_RECEIVED_BYTES(stat, buffer.size());
// handle request types
if (mt == MessageType::Authentication) { // auth
handleAuthHeader(VPackSlice(buffer.data()), messageId);
// Separate superuser traffic:
// Note that currently, velocystream traffic will never come from
// a forwarding, since we always forward with HTTP.
if (_authMethod != AuthenticationMethod::NONE && _authorized &&
this->_authToken._username.empty()) {
RequestStatistics::SET_SUPERUSER(stat);
}
} else if (mt == MessageType::Request) { // request
VPackSlice header(buffer.data());
// the handler will take ownership of this pointer
auto req = std::make_unique<VstRequest>(this->_connectionInfo,
std::move(buffer),
/*payloadOffset*/headerLength,
messageId);
req->setAuthenticated(_authorized);
req->setUser(this->_authToken._username);
req->setAuthenticationMethod(_authMethod);
if (_authorized && this->_auth->userManager() != nullptr) {
// if we don't call checkAuthentication we need to refresh
this->_auth->userManager()->refreshUser(this->_authToken._username);
}
// Separate superuser traffic:
// Note that currently, velocystream traffic will never come from
// a forwarding, since we always forward with HTTP.
if (_authMethod != AuthenticationMethod::NONE && _authorized &&
this->_authToken._username.empty()) {
RequestStatistics::SET_SUPERUSER(stat);
}
LOG_TOPIC("92fd6", DEBUG, Logger::REQUESTS)
<< "\"vst-request-begin\",\"" << (void*)this << "\",\""
<< this->_connectionInfo.clientAddress << "\",\""
<< VstRequest::translateMethod(req->requestType()) << "\",\""
<< (req->databaseName().empty() ? "" : "/_db/" + req->databaseName())
<< (Logger::logRequestParameters() ? req->fullUrl() : req->requestPath())
<< "\"";
CommTask::Flow cont = this->prepareExecution(*req.get());
if (cont == CommTask::Flow::Continue) {
auto resp = std::make_unique<VstResponse>(rest::ResponseCode::SERVER_ERROR, messageId);
resp->setContentTypeRequested(req->contentTypeResponse());
this->executeRequest(std::move(req), std::move(resp));
}
} else { // not supported on server
LOG_TOPIC("b5073", ERR, Logger::REQUESTS)
<< "\"vst-request-header\",\"" << (void*)this << "/"
<< messageId << "\"" << " is unsupported";
addSimpleResponse(rest::ResponseCode::BAD, rest::ContentType::VPACK,
messageId, VPackBuffer<uint8_t>());
}
return true;
}
template<SocketType T>
void VstCommTask<T>::sendResponse(std::unique_ptr<GeneralResponse> baseRes, RequestStatistics* stat) {
using namespace fuerte;
#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
VstResponse& response = dynamic_cast<VstResponse&>(*baseRes);
#else
VstResponse& response = static_cast<VstResponse&>(*baseRes);
#endif
this->finishExecution(*baseRes);
auto resItem = std::make_unique<ResponseItem>();
response.writeMessageHeader(resItem->metadata);
resItem->response = std::move(baseRes);
RequestStatistics::SET_WRITE_START(stat);
resItem->stat = stat;
asio_ns::const_buffer payload;
if (response.generateBody()) {
payload = asio_ns::buffer(response.payload().data(),
response.payload().size());
}
vst::message::prepareForNetwork(_vstVersion, response.messageId(),
resItem->metadata, payload,
resItem->buffers);
if (stat != nullptr) {
LOG_TOPIC("cf80d", TRACE, Logger::REQUESTS)
<< "\"vst-request-statistics\",\"" << (void*)this << "\",\""
<< static_cast<int>(response.responseCode()) << ","
<< this->_connectionInfo.clientAddress << "\"," << stat->timingsCsv();
}
double const totalTime = RequestStatistics::ELAPSED_SINCE_READ_START(stat);
// and give some request information
LOG_TOPIC("92fd7", DEBUG, Logger::REQUESTS)
<< "\"vst-request-end\",\"" << (void*)this << "/" << response.messageId() << "\",\""
<< this->_connectionInfo.clientAddress << "\",\""
<< static_cast<int>(response.responseCode()) << ","
<< "\"," << Logger::FIXED(totalTime, 6);
while (true) {
if (_writeQueue.push(resItem.get())) {
break;
}
cpu_relax();
}
resItem.release();
bool expected = _writing.load();
if (false == expected) {
if (_writing.compare_exchange_strong(expected, true)) {
// we managed to start writing
if constexpr (SocketType::Ssl == T) {
this->_protocol->context.io_context.post([self = this->shared_from_this()]() {
static_cast<VstCommTask<T>*>(self.get())->doWrite();
});
} else {
doWrite();
}
}
}
}
template<SocketType T>
void VstCommTask<T>::doWrite() {
TRI_ASSERT(_writing.load() == true);
while(true) { // loop instead of using recursion
ResponseItem* tmp = nullptr;
if (!_writeQueue.pop(tmp)) {
// careful now, we need to consider that someone queues
// a new request item
_writing.store(false);
if (_writeQueue.empty()) {
break; // done, someone else may restart
}
bool expected = false; // may fail in a race
if (_writing.compare_exchange_strong(expected, true)) {
continue; // we re-start writing
}
TRI_ASSERT(expected == true);
break; // someone else restarted writing
}
TRI_ASSERT(tmp != nullptr);
std::unique_ptr<ResponseItem> item(tmp);
auto& buffers = item->buffers;
asio_ns::async_write(this->_protocol->socket, buffers,
[self(CommTask::shared_from_this()), rsp(std::move(item))]
(asio_ns::error_code ec, size_t transferred) {
auto* thisPtr = static_cast<VstCommTask<T>*>(self.get());
RequestStatistics::SET_WRITE_END(rsp->stat);
RequestStatistics::ADD_SENT_BYTES(rsp->stat, rsp->buffers[0].size() + rsp->buffers[1].size());
if (ec) {
LOG_TOPIC("5c6b4", INFO, arangodb::Logger::REQUESTS)
<< "asio write error: '" << ec.message() << "'";
thisPtr->close();
} else {
thisPtr->doWrite(); // write next one
}
if (rsp->stat != nullptr) {
rsp->stat->release();
}
});
break; // done
}
}
template<SocketType T>
void VstCommTask<T>::handleAuthHeader(VPackSlice header, uint64_t mId) {
std::string authString;
std::string user = "";
_authorized = false;
_authMethod = AuthenticationMethod::NONE;
std::string encryption = header.at(2).copyString();
if (encryption == "jwt") { // doing JWT
authString = header.at(3).copyString();
_authMethod = AuthenticationMethod::JWT;
} else if (encryption == "plain") {
user = header.at(3).copyString();
std::string pass = header.at(4).copyString();
authString = basics::StringUtils::encodeBase64(user + ":" + pass);
_authMethod = AuthenticationMethod::BASIC;
} else {
LOG_TOPIC("01f44", WARN, Logger::REQUESTS)
<< "Unknown VST encryption type";
}
this->_authToken = this->_auth->tokenCache().checkAuthentication(_authMethod, authString);
_authorized = this->_authToken.authenticated();
if (this->_authorized || !this->_auth->isActive()) {
// simon: drivers expect a response for their auth request
this->addErrorResponse(ResponseCode::OK, rest::ContentType::VPACK, mId,
TRI_ERROR_NO_ERROR, "auth successful");
} else {
this->_authToken = auth::TokenCache::Entry::Unauthenticated();
this->addErrorResponse(rest::ResponseCode::UNAUTHORIZED, rest::ContentType::VPACK,
mId, TRI_ERROR_HTTP_UNAUTHORIZED);
}
}
template<SocketType T>
std::unique_ptr<GeneralResponse> VstCommTask<T>::createResponse(rest::ResponseCode responseCode,
uint64_t messageId) {
return std::make_unique<VstResponse>(responseCode, messageId);
}
/// @brief add chunk to this message
/// @return false if the message size is too big
template<SocketType T>
bool VstCommTask<T>::Message::addChunk(fuerte::vst::Chunk const& chunk) {
if (chunk.header.isFirst()) {
// only the first chunk has the message length
// and number of chunks (in VST/1.0)
expectedChunks = chunk.header.numberOfChunks();
expectedMsgSize = chunk.header.messageLength();
chunks.reserve(expectedChunks);
TRI_ASSERT(buffer.empty());
if (buffer.capacity() < chunk.header.messageLength()) {
buffer.reserve(chunk.header.messageLength() - buffer.capacity());
}
}
// verify total message body size limit
size_t newSize = buffer.size() + chunk.body.size();
if (newSize > CommTask::MaximalBodySize ||
(expectedMsgSize != 0 && expectedMsgSize < newSize)) {
return false; // error
}
uint8_t const* begin = reinterpret_cast<uint8_t const*>(chunk.body.data());
size_t offset = buffer.size();
buffer.append(begin, chunk.body.size());
// Add chunk to index list
chunks.push_back(ChunkInfo{chunk.header.index(), offset, chunk.body.size()});
return true;
}
/// assemble message, if true result is in _buffer
template<SocketType T>
bool VstCommTask<T>::Message::assemble() {
if (expectedChunks == 0 || chunks.size() < expectedChunks) {
return false;
}
// fast-path: chunks received in-order
bool reject = false;
for (size_t i = 0; i < expectedChunks; i++) {
if (chunks[i].index != i) {
reject = true;
break;
}
}
if (!reject) { // fast-path, chunks are in order
return true;
}
// We now have all chunks. Sort them by index.
std::sort(chunks.begin(), chunks.end(), [](auto const& a, auto const& b) {
return a.index < b.index;
});
// Combine chunk content
VPackBuffer<uint8_t> cp(std::move(buffer));
buffer.clear();
for (ChunkInfo const& info : chunks) {
buffer.append(cp.data() + info.offset, info.size);
}
return true;
}
template class arangodb::rest::VstCommTask<SocketType::Tcp>;
template class arangodb::rest::VstCommTask<SocketType::Ssl>;
#ifndef _WIN32
template class arangodb::rest::VstCommTask<SocketType::Unix>;
#endif
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