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#include "client.h"
#include "request.h"
#include <library/cpp/coroutine/dns/cache.h>
#include <library/cpp/coroutine/dns/coro.h>
#include <library/cpp/coroutine/dns/helpers.h>
#include <library/cpp/coroutine/engine/condvar.h>
#include <library/cpp/coroutine/engine/impl.h>
#include <library/cpp/coroutine/engine/network.h>
#include <library/cpp/coroutine/util/pipeque.h>
#include <library/cpp/http/client/ssl/sslsock.h>
#include <library/cpp/http/client/fetch/coctx.h>
#include <library/cpp/http/client/fetch/codes.h>
#include <library/cpp/http/client/fetch/cosocket.h>
#include <library/cpp/http/client/fetch/fetch_single.h>
#include <util/stream/output.h>
#include <util/thread/factory.h>
#include <util/system/event.h>
#include <util/system/spinlock.h>
#include <util/system/thread.h>
namespace NHttp {
namespace {
using namespace NHttpFetcher;
class TFetcher: private IThreadFactory::IThreadAble {
public:
TFetcher(const TClientOptions& options)
: Options_(options)
, FetchCoroutines(Max<size_t>(Options_.FetchCoroutines, 1))
, RequestsQueue_(true, false)
, Done_(false)
{
}
void Start() {
T_ = SystemThreadFactory()->Run(this);
}
void Stop() {
if (T_) {
for (size_t i = 0; i < FetchCoroutines; ++i) {
RequestsQueue_.Push(nullptr);
}
T_->Join();
T_.Reset();
}
}
~TFetcher() override {
Stop();
}
TFetchState FetchAsync(const TFetchRequestRef& req, NHttpFetcher::TCallBack cb) {
req->SetCallback(cb);
RequestsQueue_.Push(req);
return TFetchState(req);
}
static TFetcher* Instance() {
static struct TFetcherHolder {
TFetcherHolder() {
Fetcher.Start();
}
TFetcher Fetcher{{}};
} holder;
return &holder.Fetcher;
}
private:
void DoDrainLoop(TCont* c) {
TInstant nextDrain = TInstant::Now() + Options_.KeepAliveTimeout;
while (true) {
DrainMutex_.LockI(c);
while (true) {
if (Done_) {
DrainMutex_.UnLock();
// All sockets in the connection pool should be cleared
// on some active couroutine.
SocketPool_.Clear();
return;
}
if (DrainCond_.WaitD(c, &DrainMutex_, nextDrain) != 0) {
// In case of timeout the mutex will be in unlocked state.
break;
}
}
SocketPool_.Drain(Options_.KeepAliveTimeout);
nextDrain = TInstant::Now() + Options_.KeepAliveTimeout;
}
}
void DoFetchLoop(TCont* c) {
while (true) {
if (NCoro::PollI(c, RequestsQueue_.PopFd(), CONT_POLL_READ) == 0) {
TFetchRequestRef req;
if (RequestsQueue_.Pop(&req)) {
if (!req) {
DrainMutex_.LockI(c);
const auto wasDone = Done_;
Done_ = true;
DrainMutex_.UnLock();
if (!wasDone) {
DrainCond_.Signal();
}
break;
}
if (req->IsCancelled()) {
auto result = MakeIntrusive<TResult>(req->GetRequestImpl()->Url, FETCH_CANCELLED);
req->OnResponse(result);
continue;
}
try {
while (true) {
auto getConnectionPool = [&] () -> TSocketPool* {
if (!Options_.KeepAlive || req->GetForceReconnect()) {
return nullptr;
}
return &SocketPool_;
};
auto sleep = req->OnResponse(
FetchSingleImpl(req->GetRequestImpl(), getConnectionPool()));
if (!req->IsValid()) {
break;
}
if (sleep != TDuration::Zero()) {
c->SleepT(sleep);
}
}
} catch (...) {
req->SetException(std::current_exception());
}
}
}
}
}
void DoExecute() override {
// Executor must be initialized in the same thread that will use it
// for fibers to work correctly on windows
TContExecutor executor(Options_.ExecutorStackSize);
TThread::SetCurrentThreadName(Options_.Name.c_str());
NAsyncDns::TOptions dnsOpts;
dnsOpts.SetMaxRequests(200);
NAsyncDns::TContResolver resolver(&executor, dnsOpts);
THolder<NAsyncDns::TContDnsCache> dnsCache;
if (Options_.DnsCacheLifetime != TDuration::Zero()) {
NAsyncDns::TCacheOptions cacheOptions;
cacheOptions.SetEntryLifetime(Options_.DnsCacheLifetime);
dnsCache = MakeHolder<NAsyncDns::TContDnsCache>(&executor, cacheOptions);
}
TCoCtxSetter ctxSetter(&executor, &resolver, dnsCache.Get());
for (size_t i = 0; i < FetchCoroutines; ++i) {
executor.Create<TFetcher, &TFetcher::DoFetchLoop>(this, "fetch_loop");
}
if (Options_.KeepAlive) {
executor.Create<TFetcher, &TFetcher::DoDrainLoop>(this, "drain_loop");
}
executor.Execute();
executor.Abort();
}
private:
using IThreadRef = THolder<IThreadFactory::IThread>;
const TClientOptions Options_;
const size_t FetchCoroutines;
TContCondVar DrainCond_;
TContMutex DrainMutex_;
TSocketPool SocketPool_;
/// Queue of incoming requests.
TPipeQueue<TFetchRequestRef> RequestsQueue_;
bool Done_;
IThreadRef T_;
};
}
class TFetchClient::TImpl: public TFetcher {
public:
inline TImpl(const TClientOptions& options)
: TFetcher(options)
{
}
};
TFetchClient::TFetchClient(const TClientOptions& options)
: Impl_(new TImpl(options))
{
Impl_->Start();
}
TFetchClient::~TFetchClient() {
Impl_->Stop();
}
TFetchState TFetchClient::Fetch(const TFetchQuery& query, NHttpFetcher::TCallBack cb) {
return Impl_->FetchAsync(TFetchRequest::FromQuery(query), cb);
}
TResultRef Fetch(const TFetchQuery& query) {
return FetchAsync(query, NHttpFetcher::TCallBack()).Get();
}
TFetchState FetchAsync(const TFetchQuery& query, NHttpFetcher::TCallBack cb) {
return TFetcher::Instance()->FetchAsync(TFetchRequest::FromQuery(query), cb);
}
}
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