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CarbonRouterClient-inl.h
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CarbonRouterClient-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 <cassert>
#include "mcrouter/CarbonRouterInstance.h"
#include "mcrouter/ForEachPossibleClient.h"
#include "mcrouter/ProxyRequestContextTyped.h"
#include "mcrouter/lib/RouteHandleTraverser.h"
namespace facebook {
namespace memcache {
namespace mcrouter {
namespace detail {
template <class Request>
void bumpCarbonRouterClientStats(
CacheClientStats& stats,
const Request& req,
const ReplyT<Request>& reply,
carbon::GetLikeT<Request> = 0) {
auto replyBytes = carbon::valuePtrUnsafe(reply)
? carbon::valuePtrUnsafe(reply)->computeChainDataLength()
: 0;
stats.recordFetchRequest(req.key().fullKey().size(), replyBytes);
}
template <class Request>
void bumpCarbonRouterClientStats(
CacheClientStats& stats,
const Request& req,
const ReplyT<Request>&,
carbon::UpdateLikeT<Request> = 0) {
auto valueBytes = carbon::valuePtrUnsafe(req)
? carbon::valuePtrUnsafe(req)->computeChainDataLength()
: 0;
stats.recordUpdateRequest(req.key().fullKey().size(), valueBytes);
}
template <class Request>
void bumpCarbonRouterClientStats(
CacheClientStats& stats,
const Request& req,
const ReplyT<Request>&,
carbon::ArithmeticLikeT<Request> = 0) {
stats.recordUpdateRequest(req.key().fullKey().size(), 0);
}
template <class Request>
void bumpCarbonRouterClientStats(
CacheClientStats& stats,
const Request& req,
const ReplyT<Request>&,
carbon::DeleteLikeT<Request> = 0) {
stats.recordInvalidateRequest(req.key().fullKey().size());
}
template <class Request>
void bumpCarbonRouterClientStats(
CacheClientStats&,
const Request&,
const ReplyT<Request>&,
carbon::OtherThanT<
Request,
carbon::GetLike<>,
carbon::UpdateLike<>,
carbon::ArithmeticLike<>,
carbon::DeleteLike<>> = 0) {
// We don't have any other operation specific stats.
}
template <class Request>
const Request& unwrapRequest(const Request& req) {
return req;
}
template <class Request>
const Request& unwrapRequest(std::reference_wrapper<const Request>& req) {
return req.get();
}
} // namespace detail
template <class RouterInfo>
template <class Request, class F>
bool CarbonRouterClient<RouterInfo>::send(
const Request& req,
F&& callback,
folly::StringPiece ipAddr) {
auto makePreq = [this, ipAddr, &req, &callback](bool inBatch) mutable {
return makeProxyRequestContext(
req, std::forward<F>(callback), ipAddr, inBatch);
};
auto cancelRemaining = [&req, &callback]() {
callback(req, ReplyT<Request>(carbon::Result::LOCAL_ERROR));
};
return sendMultiImpl(1, std::move(makePreq), std::move(cancelRemaining));
}
template <class RouterInfo>
template <class F, class G>
bool CarbonRouterClient<RouterInfo>::sendMultiImpl(
size_t nreqs,
F&& makeNextPreq,
G&& failRemaining) {
auto router = router_.lock();
if (UNLIKELY(!router)) {
return false;
}
auto notify = [this]() {
assert(mode_ != ThreadMode::SameThread);
if (mode_ == ThreadMode::FixedRemoteThread) {
proxies_[proxyIdx_]->messageQueue_->notifyRelaxed();
} else {
assert(mode_ == ThreadMode::AffinitizedRemoteThread);
for (size_t i = 0; i < proxies_.size(); ++i) {
if (proxiesToNotify_[i]) {
proxies_[i]->messageQueue_->notifyRelaxed();
proxiesToNotify_[i] = false;
}
}
}
};
if (maxOutstanding() == 0) {
if (mode_ == ThreadMode::SameThread) {
for (size_t i = 0; i < nreqs; ++i) {
sendSameThread(makeNextPreq(/* inBatch */ false));
}
} else {
bool delayNotification = shouldDelayNotification(nreqs);
for (size_t i = 0; i < nreqs; ++i) {
sendRemoteThread(makeNextPreq(delayNotification), delayNotification);
}
if (delayNotification) {
notify();
}
}
} else if (maxOutstandingError()) {
for (size_t begin = 0; begin < nreqs;) {
auto end = begin +
counting_sem_lazy_nonblocking(outstandingReqsSem(), nreqs - begin);
if (begin == end) {
failRemaining();
break;
}
if (mode_ == ThreadMode::SameThread) {
for (size_t i = begin; i < end; i++) {
sendSameThread(makeNextPreq(/* inBatch */ false));
}
} else {
bool delayNotification = shouldDelayNotification(end - begin);
for (size_t i = begin; i < end; i++) {
sendRemoteThread(makeNextPreq(delayNotification), delayNotification);
}
if (delayNotification) {
notify();
}
}
begin = end;
}
} else {
assert(mode_ != ThreadMode::SameThread);
size_t i = 0;
size_t n = 0;
while (i < nreqs) {
n += counting_sem_lazy_wait(outstandingReqsSem(), nreqs - n);
bool delayNotification = shouldDelayNotification(n);
for (size_t j = i; j < n; ++j) {
sendRemoteThread(makeNextPreq(delayNotification), delayNotification);
}
if (delayNotification) {
notify();
}
i = n;
}
}
return true;
}
template <class RouterInfo>
template <class Request>
typename std::enable_if<
ListContains<typename RouterInfo::RoutableRequests, Request>::value,
uint64_t>::type
CarbonRouterClient<RouterInfo>::findAffinitizedProxyIdx(
const Request& req) const {
assert(mode_ == ThreadMode::AffinitizedRemoteThread);
// Create a traverser
uint64_t hash = 0;
RouteHandleTraverser<typename RouterInfo::RouteHandleIf> t(
/* start */ nullptr,
/* end */ nullptr,
[&hash](const AccessPoint& ap, const PoolContext& poolContext) mutable {
if (!poolContext.isShadow) {
hash = ap.getHash();
// if it's not a shadow and got the hash, we should stop the traversal
return true;
}
return false;
});
// Traverse the routing tree.
{
auto config = proxies_[proxyIdx_]->getConfigLocked();
config.second.proxyRoute().traverse(req, t);
}
return hash % proxies_.size();
}
template <class RouterInfo>
template <class Request>
typename std::enable_if<
!ListContains<typename RouterInfo::RoutableRequests, Request>::value,
uint64_t>::type
CarbonRouterClient<RouterInfo>::findAffinitizedProxyIdx(
const Request& /* unused */) const {
assert(mode_ == ThreadMode::AffinitizedRemoteThread);
return 0;
}
template <class RouterInfo>
template <class InputIt, class F>
bool CarbonRouterClient<RouterInfo>::send(
InputIt begin,
InputIt end,
F&& callback,
folly::StringPiece ipAddr) {
using IterReference = typename std::iterator_traits<InputIt>::reference;
using Request = typename std::decay<decltype(
detail::unwrapRequest(std::declval<IterReference>()))>::type;
auto makeNextPreq = [this, ipAddr, &callback, &begin](bool inBatch) {
auto proxyRequestContext = makeProxyRequestContext(
detail::unwrapRequest(*begin), callback, ipAddr, inBatch);
++begin;
return proxyRequestContext;
};
auto cancelRemaining = [&begin, &end, &callback]() {
while (begin != end) {
callback(
detail::unwrapRequest(*begin),
ReplyT<Request>(carbon::Result::LOCAL_ERROR));
++begin;
}
};
return sendMultiImpl(
std::distance(begin, end),
std::move(makeNextPreq),
std::move(cancelRemaining));
}
template <class RouterInfo>
void CarbonRouterClient<RouterInfo>::sendRemoteThread(
std::unique_ptr<ProxyRequestContextWithInfo<RouterInfo>> req,
bool skipNotification) {
// Use the proxy saved in the ProxyRequestContext, as it may change
// base on the ThreadMode.
// Get a reference to the Proxy first as the unique pointer is released as
// part of the blockingWriteRelaxed call.
Proxy<RouterInfo>& pr = req->proxyWithRouterInfo();
pr.messageQueue_->blockingWriteNoNotify(
ProxyMessage::Type::REQUEST, req.release());
if (!skipNotification) {
pr.messageQueue_->notifyRelaxed();
}
}
template <class RouterInfo>
void CarbonRouterClient<RouterInfo>::sendSameThread(
std::unique_ptr<ProxyRequestContextWithInfo<RouterInfo>> req) {
// We are guaranteed to be in the thread that owns proxies_[proxyIdx_]
proxies_[proxyIdx_]->messageReady(ProxyMessage::Type::REQUEST, req.release());
}
template <class RouterInfo>
CarbonRouterClient<RouterInfo>::CarbonRouterClient(
std::shared_ptr<CarbonRouterInstance<RouterInfo>> router,
size_t maximumOutstanding,
bool maximumOutstandingError,
ThreadMode mode)
: CarbonRouterClientBase(maximumOutstanding, maximumOutstandingError),
router_(router),
mode_(mode),
proxies_(router->getProxies()),
proxiesToNotify_(proxies_.size(), false) {
proxyIdx_ = router->nextProxyIndex();
}
template <class RouterInfo>
typename CarbonRouterClient<RouterInfo>::Pointer
CarbonRouterClient<RouterInfo>::create(
std::shared_ptr<CarbonRouterInstance<RouterInfo>> router,
size_t maximumOutstanding,
bool maximumOutstandingError,
ThreadMode mode) {
auto client = new CarbonRouterClient<RouterInfo>(
std::move(router), maximumOutstanding, maximumOutstandingError, mode);
client->self_ = std::shared_ptr<CarbonRouterClient>(client);
return Pointer(client);
}
template <class RouterInfo>
CarbonRouterClient<RouterInfo>::~CarbonRouterClient() {
assert(disconnected_);
}
template <class RouterInfo>
bool CarbonRouterClient<RouterInfo>::shouldDelayNotification(
size_t batchSize) const {
return mode_ != ThreadMode::SameThread && batchSize > 1;
}
template <class RouterInfo>
template <class Request, class CallbackFunc>
std::unique_ptr<ProxyRequestContextWithInfo<RouterInfo>>
CarbonRouterClient<RouterInfo>::makeProxyRequestContext(
const Request& req,
CallbackFunc&& callback,
folly::StringPiece ipAddr,
bool inBatch) {
Proxy<RouterInfo>* proxy = proxies_[proxyIdx_];
if (mode_ == ThreadMode::AffinitizedRemoteThread) {
size_t idx = findAffinitizedProxyIdx(req);
proxy = proxies_[idx];
if (inBatch) {
proxiesToNotify_[idx] = true;
}
}
auto proxyRequestContext = createProxyRequestContext(
*proxy,
req,
[this, cb = std::forward<CallbackFunc>(callback)](
const Request& request, ReplyT<Request>&& reply) mutable {
detail::bumpCarbonRouterClientStats(stats_, request, reply);
if (disconnected_) {
// "Cancelled" reply.
cb(request, ReplyT<Request>(carbon::Result::UNKNOWN));
} else {
cb(request, std::move(reply));
}
});
proxyRequestContext->setRequester(self_);
if (!ipAddr.empty()) {
proxyRequestContext->setUserIpAddress(ipAddr);
}
return proxyRequestContext;
}
} // namespace mcrouter
} // namespace memcache
} // namespace facebook