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ProxyDestination-inl.h
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ProxyDestination-inl.h
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/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#include <limits>
#include <random>
#include <folly/io/async/AsyncSSLSocket.h>
#include "mcrouter/OptionsUtil.h"
#include "mcrouter/ProxyBase.h"
#include "mcrouter/ProxyDestinationMap.h"
#include "mcrouter/config-impl.h"
#include "mcrouter/config.h"
#include "mcrouter/lib/Clocks.h"
#include "mcrouter/lib/Reply.h"
#include "mcrouter/lib/fbi/cpp/util.h"
#include "mcrouter/lib/mc/protocol.h"
#include "mcrouter/lib/network/ConnectionDownReason.h"
#include "mcrouter/lib/network/ConnectionOptions.h"
#include "mcrouter/lib/network/McFizzClient.h"
#include "mcrouter/lib/network/McSSLUtil.h"
#include "mcrouter/lib/network/RpcStatsContext.h"
#include "mcrouter/lib/network/TlsToPlainTransport.h"
namespace facebook {
namespace memcache {
namespace mcrouter {
template <class Transport>
template <class Request>
ReplyT<Request> ProxyDestination<Transport>::send(
const Request& request,
DestinationRequestCtx& requestContext,
std::chrono::milliseconds timeout,
RpcStatsContext& rpcStatsContext) {
markAsActive();
auto reply = getTransport().sendSync(request, timeout, &rpcStatsContext);
onReply(
reply.result(), requestContext, rpcStatsContext, request.isBufferDirty());
return reply;
}
template <class Transport>
bool ProxyDestination<Transport>::latencyAboveThreshold(uint64_t latency) {
const auto rxmitDeviation =
proxy().router().opts().rxmit_latency_deviation_us;
if (!rxmitDeviation) {
return false;
}
return (
static_cast<double>(latency) - stats().avgLatency.value() >
static_cast<double>(rxmitDeviation));
}
template <class Transport>
void ProxyDestination<Transport>::handleRxmittingConnection(
const carbon::Result result,
uint64_t latency) {
constexpr uint32_t kReconnectionHoldoffFactor = 25;
if (!transport_) {
return;
}
const auto retransCycles =
proxy().router().opts().collect_rxmit_stats_every_hz;
if (retransCycles > 0 &&
(isDataTimeoutResult(result) || latencyAboveThreshold(latency))) {
const auto curCycles = cycles::getCpuCycles();
if (curCycles > lastRetransCycles_ + retransCycles) {
lastRetransCycles_ = curCycles;
const auto currRetransPerKByte = transport_->getRetransmitsPerKb();
if (currRetransPerKByte >= 0.0) {
stats().retransPerKByte = currRetransPerKByte;
proxy().stats().setValue(
retrans_per_kbyte_max_stat,
std::max(
proxy().stats().getValue(retrans_per_kbyte_max_stat),
static_cast<uint64_t>(currRetransPerKByte)));
proxy().stats().increment(
retrans_per_kbyte_sum_stat,
static_cast<int64_t>(currRetransPerKByte));
proxy().stats().increment(retrans_num_total_stat);
}
if (proxy().router().isRxmitReconnectionDisabled()) {
return;
}
if (rxmitsToCloseConnection_ > 0 &&
currRetransPerKByte >= rxmitsToCloseConnection_) {
std::uniform_int_distribution<uint64_t> dist(
1, kReconnectionHoldoffFactor);
const uint64_t reconnectionJitters =
retransCycles * dist(proxy().randomGenerator());
if (lastConnCloseCycles_ + reconnectionJitters > curCycles) {
return;
}
transport_->closeNow();
proxy().stats().increment(retrans_closed_connections_stat);
lastConnCloseCycles_ = curCycles;
const auto maxThreshold =
proxy().router().opts().max_rxmit_reconnect_threshold;
const uint64_t maxRxmitReconnThreshold = maxThreshold == 0
? std::numeric_limits<uint64_t>::max()
: maxThreshold;
rxmitsToCloseConnection_ =
std::min(maxRxmitReconnThreshold, 2 * rxmitsToCloseConnection_);
} else if (3 * currRetransPerKByte < rxmitsToCloseConnection_) {
const auto minThreshold =
proxy().router().opts().min_rxmit_reconnect_threshold;
rxmitsToCloseConnection_ =
std::max(minThreshold, rxmitsToCloseConnection_ / 2);
}
}
}
}
template <class Transport>
void ProxyDestination<Transport>::updateTransportTimeoutsIfShorter(
std::chrono::milliseconds shortestConnectTimeout,
std::chrono::milliseconds shortestWriteTimeout) {
folly::SpinLockGuard g(transportLock_);
if (transport_) {
transport_->updateTimeoutsIfShorter(
shortestConnectTimeout, shortestWriteTimeout);
}
}
template <class Transport>
carbon::Result ProxyDestination<Transport>::sendProbe() {
// Will reconnect if connection was closed
// Version commands shouldn't take much longer than stablishing a
// connection, so just using shortestConnectTimeout() here.
return getTransport()
.sendSync(McVersionRequest(), shortestWriteTimeout())
.result();
}
template <class Transport>
void ProxyDestination<Transport>::onReply(
const carbon::Result result,
DestinationRequestCtx& destreqCtx,
const RpcStatsContext& rpcStatsContext,
bool isRequestBufferDirty) {
handleTko(result, /* isProbeRequest */ false);
if (!stats().results) {
stats().results = std::make_unique<std::array<
uint64_t,
static_cast<size_t>(carbon::Result::NUM_RESULTS)>>();
}
++(*stats().results)[static_cast<size_t>(result)];
destreqCtx.endTime = nowUs();
int64_t latency = destreqCtx.endTime - destreqCtx.startTime;
stats().avgLatency.insertSample(latency);
if (accessPoint()->compressed()) {
if (rpcStatsContext.usedCodecId > 0) {
proxy().stats().increment(replies_compressed_stat);
} else {
proxy().stats().increment(replies_not_compressed_stat);
}
proxy().stats().increment(
reply_traffic_before_compression_stat,
rpcStatsContext.replySizeBeforeCompression);
proxy().stats().increment(
reply_traffic_after_compression_stat,
rpcStatsContext.replySizeAfterCompression);
}
proxy().stats().increment(destination_reqs_total_sum_stat);
if (isRequestBufferDirty) {
proxy().stats().increment(destination_reqs_dirty_buffer_sum_stat);
}
handleRxmittingConnection(result, latency);
}
template <class Transport>
typename Transport::RequestQueueStats
ProxyDestination<Transport>::getRequestStats() const {
RequestQueueStats stats{0, 0};
{
folly::SpinLockGuard g(transportLock_);
if (transport_) {
stats = transport_->getRequestQueueStats();
}
}
return stats;
}
template <class Transport>
std::shared_ptr<ProxyDestination<Transport>>
ProxyDestination<Transport>::create(
ProxyBase& proxy,
std::shared_ptr<AccessPoint> ap,
std::chrono::milliseconds timeout,
uint64_t qosClass,
uint64_t qosPath,
folly::StringPiece routerInfoName) {
checkLogic(
Transport::isCompatible(ap->getProtocol()),
"Transport {} not compatible with {} protocol.",
Transport::name(),
mc_protocol_to_string(ap->getProtocol()));
std::shared_ptr<ProxyDestination<Transport>> ptr(
new ProxyDestination<Transport>(
proxy, std::move(ap), timeout, qosClass, qosPath, routerInfoName));
ptr->selfPtr_ = ptr;
return ptr;
}
template <class Transport>
ProxyDestination<Transport>::~ProxyDestination() {
if (proxy().destinationMap()) {
// Only remove if we are not shutting down Proxy.
proxy().destinationMap()->removeDestination(*this);
}
if (transport_) {
transport_->setConnectionStatusCallbacks(
ConnectionStatusCallbacks{nullptr, nullptr});
transport_->closeNow();
}
onTransitionFromState(stats().state);
proxy().stats().decrement(num_servers_stat);
if (accessPoint()->useSsl()) {
proxy().stats().decrement(num_ssl_servers_stat);
}
}
template <class Transport>
ProxyDestination<Transport>::ProxyDestination(
ProxyBase& proxy,
std::shared_ptr<AccessPoint> ap,
std::chrono::milliseconds timeout,
uint64_t qosClass,
uint64_t qosPath,
folly::StringPiece routerInfoName)
: ProxyDestinationBase(
proxy,
std::move(ap),
timeout,
qosClass,
qosPath,
routerInfoName),
rxmitsToCloseConnection_(
proxy.router().opts().min_rxmit_reconnect_threshold) {}
template <class Transport>
void ProxyDestination<Transport>::resetInactive() {
// No need to reset non-existing client.
if (transport_) {
std::unique_ptr<Transport> client;
{
folly::SpinLockGuard g(transportLock_);
client = std::move(transport_);
}
client->closeNow();
stats().inactiveConnectionClosedTimestampUs = nowUs();
}
}
template <class Transport>
void ProxyDestination<Transport>::initializeTransport() {
assert(!transport_);
ConnectionOptions options(accessPoint());
auto& opts = proxy().router().opts();
options.tcpKeepAliveCount = opts.keepalive_cnt;
options.tcpKeepAliveIdle = opts.keepalive_idle_s;
options.tcpKeepAliveInterval = opts.keepalive_interval_s;
options.numConnectTimeoutRetries = opts.connect_timeout_retries;
options.connectTimeout = shortestConnectTimeout();
options.writeTimeout = shortestWriteTimeout();
options.routerInfoName = routerInfoName();
options.payloadFormat = opts.use_compact_serialization
? PayloadFormat::CompactProtocolCompatibility
: PayloadFormat::Carbon;
if (!opts.debug_fifo_root.empty()) {
options.debugFifoPath = getClientDebugFifoFullPath(opts);
}
if (opts.enable_qos) {
options.enableQoS = true;
options.qosClass = qosClass();
options.qosPath = qosPath();
}
options.useJemallocNodumpAllocator = opts.jemalloc_nodump_buffers;
if (accessPoint()->compressed()) {
if (auto codecManager = proxy().router().getCodecManager()) {
options.compressionCodecMap = codecManager->getCodecMap();
}
}
if (accessPoint()->useSsl()) {
options.securityOpts.sslPemCertPath = opts.pem_cert_path;
options.securityOpts.sslPemKeyPath = opts.pem_key_path;
if (opts.ssl_verify_peers) {
options.securityOpts.sslPemCaPath = opts.pem_ca_path;
}
options.securityOpts.sessionCachingEnabled = opts.ssl_connection_cache;
options.securityOpts.sslHandshakeOffload = opts.ssl_handshake_offload;
options.securityOpts.sslServiceIdentity = opts.ssl_service_identity;
options.securityOpts.tfoEnabledForSsl = opts.enable_ssl_tfo;
options.securityOpts.tlsPreferOcbCipher = opts.tls_prefer_ocb_cipher;
}
auto client =
std::make_unique<Transport>(proxy().eventBase(), std::move(options));
{
folly::SpinLockGuard g(transportLock_);
transport_ = std::move(client);
}
transport_->setFlushList(&proxy().flushList());
transport_->setRequestStatusCallbacks(RequestStatusCallbacks{
[this](int pending, int inflight) { // onStateChange
if (pending != 0) {
proxy().stats().increment(destination_pending_reqs_stat, pending);
proxy().stats().setValue(
destination_max_pending_reqs_stat,
std::max(
proxy().stats().getValue(destination_max_pending_reqs_stat),
proxy().stats().getValue(destination_pending_reqs_stat)));
}
if (inflight != 0) {
proxy().stats().increment(destination_inflight_reqs_stat, inflight);
proxy().stats().setValue(
destination_max_inflight_reqs_stat,
std::max(
proxy().stats().getValue(destination_max_inflight_reqs_stat),
proxy().stats().getValue(destination_inflight_reqs_stat)));
}
},
[this](size_t numToSend) { // onWrite
proxy().stats().increment(num_socket_writes_stat);
proxy().stats().increment(destination_batches_sum_stat);
proxy().stats().increment(destination_requests_sum_stat, numToSend);
},
[this]() { // onPartialWrite
proxy().stats().increment(num_socket_partial_writes_stat);
}});
transport_->setConnectionStatusCallbacks(ConnectionStatusCallbacks{
[this](
const folly::AsyncTransportWrapper& socket,
int64_t numConnectRetries) mutable {
setState(State::Up);
proxy().stats().increment(num_connections_opened_stat);
updatePoolStatConnections(true);
auto mech = accessPoint()->getSecurityMech();
if (mech == SecurityMech::TLS_TO_PLAINTEXT) {
if (const auto* tlsToPlainSock =
socket.getUnderlyingTransport<TlsToPlainTransport>()) {
auto stats = tlsToPlainSock->getStats();
proxy().stats().increment(num_tls_to_plain_connections_opened_stat);
if (stats.sessionReuseAttempted) {
proxy().stats().increment(
num_tls_to_plain_resumption_attempts_stat);
}
if (stats.sessionReuseSuccess) {
proxy().stats().increment(
num_tls_to_plain_resumption_successes_stat);
}
} else {
proxy().stats().increment(num_tls_to_plain_fallback_failures_stat);
}
}
if (mech == SecurityMech::KTLS12) {
auto stats = McSSLUtil::getKtlsStats(socket);
if (stats) {
proxy().stats().increment(num_ktls_connections_opened_stat);
if (stats->sessionReuseAttempted) {
proxy().stats().increment(num_ktls_resumption_attempts_stat);
}
if (stats->sessionReuseSuccess) {
proxy().stats().increment(num_ktls_resumption_successes_stat);
}
} else {
proxy().stats().increment(num_ktls_fallback_failures_stat);
}
}
// no else if here in case the tls to plain didn't work - we can capture
// ssl socket stats here
if (const auto* sslSocket =
socket.getUnderlyingTransport<folly::AsyncSSLSocket>()) {
proxy().stats().increment(num_ssl_connections_opened_stat);
if (sslSocket->sessionResumptionAttempted()) {
proxy().stats().increment(num_ssl_resumption_attempts_stat);
}
if (sslSocket->getSSLSessionReused()) {
proxy().stats().increment(num_ssl_resumption_successes_stat);
}
} else if (
const auto* fizzSock =
socket.getUnderlyingTransport<McFizzClient>()) {
proxy().stats().increment(num_ssl_connections_opened_stat);
if (fizzSock->pskResumed()) {
proxy().stats().increment(num_ssl_resumption_successes_stat);
proxy().stats().increment(num_ssl_resumption_attempts_stat);
} else {
auto pskState = fizzSock->getState().pskType();
if (pskState && pskState.value() == fizz::PskType::Rejected) {
// session resumption was attempted, but failed
proxy().stats().increment(num_ssl_resumption_attempts_stat);
}
}
}
if (numConnectRetries > 0) {
proxy().stats().increment(num_connect_success_after_retrying_stat);
proxy().stats().increment(
num_connect_retries_stat, numConnectRetries);
}
updateConnectionClosedInternalStat();
},
[pdstnPtr = selfPtr_](
ConnectionDownReason reason, int64_t numConnectRetries) {
auto pdstn = pdstnPtr.lock();
if (!pdstn) {
LOG(WARNING) << "Proxy destination is already destroyed. "
"Stats will not be bumped.";
return;
}
pdstn->proxy().stats().increment(num_connections_closed_stat);
if (pdstn->accessPoint()->useSsl()) {
auto mech = pdstn->accessPoint()->getSecurityMech();
if (mech == SecurityMech::TLS_TO_PLAINTEXT) {
pdstn->proxy().stats().increment(
num_tls_to_plain_connections_closed_stat);
} else if (mech == SecurityMech::KTLS12) {
pdstn->proxy().stats().increment(num_ktls_connections_closed_stat);
} else {
pdstn->proxy().stats().increment(num_ssl_connections_closed_stat);
}
}
pdstn->updatePoolStatConnections(false);
if (reason == ConnectionDownReason::ABORTED) {
pdstn->setState(State::Closed);
} else {
// In case of server going away, we should gracefully close the
// connection (i.e. allow remaining outstanding requests to drain).
if (reason == ConnectionDownReason::SERVER_GONE_AWAY) {
pdstn->closeGracefully();
}
pdstn->setState(State::Down);
pdstn->handleTko(
reason == ConnectionDownReason::CONNECT_TIMEOUT
? carbon::Result::CONNECT_TIMEOUT
: carbon::Result::CONNECT_ERROR,
/* isProbeRequest= */ false);
}
pdstn->proxy().stats().increment(
num_connect_retries_stat, numConnectRetries);
}});
if (opts.target_max_inflight_requests > 0) {
transport_->setThrottle(
opts.target_max_inflight_requests, opts.target_max_pending_requests);
}
}
template <class Transport>
void ProxyDestination<Transport>::closeGracefully() {
if (transport_) {
// In case we have outstanding probe, we should close now, to get it
// properly cleared.
if (probeInflight()) {
transport_->closeNow();
}
// Check again, in case we reset it in closeNow()
if (transport_) {
transport_->setConnectionStatusCallbacks(
ConnectionStatusCallbacks{nullptr, nullptr});
std::unique_ptr<Transport> client;
{
folly::SpinLockGuard g(transportLock_);
client = std::move(transport_);
}
client.reset();
}
}
}
template <class Transport>
Transport& ProxyDestination<Transport>::getTransport() {
if (!transport_) {
initializeTransport();
}
return *transport_;
}
} // namespace mcrouter
} // namespace memcache
} // namespace facebook