YT-19324: move YT provider to ydb/library/yql

This commit is formed by the following script: https://paste.yandex-team.ru/6f92e4b8-efc5-4d34-948b-15ee2accd7e7/text.
This commit has zero effect on all projects that depend on YQL.

The summary of changes:
- `yql/providers/yt -> ydb/library/yql/providers/yt `- the whole implementation of YT provider is moved into YDB code base for further export as a part of YT YQL plugin shared library;
- `yql/providers/stat/{expr_nodes,uploader} -> ydb/library/yql/providers/stat/{expr_nodes,uploader}` - a small interface without implementation and the description of stat expr nodes;
- `yql/core/extract_predicate/ut -> ydb/library/yql/core/extract_predicate/ut`;
- `yql/core/{ut,ut_common} -> ydb/library/yql/core/{ut,ut_common}`;
- `yql/core` is gone;
- `yql/library/url_preprocessing -> ydb/library/yql/core/url_preprocessing`.

**NB**: all new targets inside `ydb/` are under `IF (NOT CMAKE_EXPORT)` clause which disables them from open-source cmake generation and ya make build. They will be enabled in the subsequent commits.

1 files changed, 211 insertions, 0 deletions

diff --git a/library/cpp/threading/blocking_queue/blocking_queue_ut.cpp b/library/cpp/threading/blocking_queue/blocking_queue_ut.cpp
new file mode 100644
index 0000000000..26e125279d
--- /dev/null
+++ b/library/cpp/threading/blocking_queue/blocking_queue_ut.cpp
@@ -0,0 +1,211 @@
+#include "blocking_queue.h"
+
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <util/string/builder.h>
+#include <util/system/thread.h>
+
+namespace {
+    class TFunctionThread: public ISimpleThread {
+    public:
+        using TFunc = std::function<void()>;
+
+    private:
+        TFunc Func;
+
+    public:
+        TFunctionThread(const TFunc& func)
+            : Func(func)
+        {
+        }
+
+        void* ThreadProc() noexcept override {
+            Func();
+            return nullptr;
+        }
+    };
+
+}
+
+IOutputStream& operator<<(IOutputStream& o, const TMaybe<int>& val) {
+    if (val) {
+        o << "TMaybe<int>(" << val.GetRef() << ')';
+    } else {
+        o << "TMaybe<int>()";
+    }
+    return o;
+}
+
+Y_UNIT_TEST_SUITE(BlockingQueueTest) {
+    Y_UNIT_TEST(SimplePushPopTest) {
+        const size_t limit = 100;
+
+        NThreading::TBlockingQueue<int> queue(100);
+
+        for (int i = 0; i != limit; ++i) {
+            queue.Push(i);
+        }
+
+        for (int i = 0; i != limit; ++i) {
+            UNIT_ASSERT_VALUES_EQUAL(queue.Pop(), i);
+        }
+
+        UNIT_ASSERT(queue.Empty());
+    }
+
+    Y_UNIT_TEST(SimpleStopTest) {
+        const size_t limit = 100;
+
+        NThreading::TBlockingQueue<int> queue(100);
+
+        for (int i = 0; i != limit; ++i) {
+            queue.Push(i);
+        }
+        queue.Stop();
+
+        bool ok = queue.Push(100500);
+        UNIT_ASSERT_VALUES_EQUAL(ok, false);
+
+        for (int i = 0; i != limit; ++i) {
+            UNIT_ASSERT_VALUES_EQUAL(queue.Pop(), i);
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(queue.Pop(), TMaybe<int>());
+    }
+
+    Y_UNIT_TEST(BigPushPop) {
+        const int limit = 100000;
+
+        NThreading::TBlockingQueue<int> queue(10);
+
+        TFunctionThread pusher([&] {
+            for (int i = 0; i != limit; ++i) {
+                if (!queue.Push(i)) {
+                    break;
+                }
+            }
+        });
+
+        pusher.Start();
+
+        try {
+            for (int i = 0; i != limit; ++i) {
+                size_t size = queue.Size();
+                UNIT_ASSERT_C(size <= 10, (TStringBuilder() << "Size exceeds 10: " << size).data());
+                UNIT_ASSERT_VALUES_EQUAL(queue.Pop(), i);
+            }
+        } catch (...) {
+            // gracefull shutdown of pusher thread if assertion fails
+            queue.Stop();
+            throw;
+        }
+
+        pusher.Join();
+    }
+
+    Y_UNIT_TEST(StopWhenMultiplePoppers) {
+        NThreading::TBlockingQueue<int> queue(10);
+        TFunctionThread popper1([&] {
+            UNIT_ASSERT_VALUES_EQUAL(queue.Pop(), TMaybe<int>());
+        });
+        TFunctionThread popper2([&] {
+            UNIT_ASSERT_VALUES_EQUAL(queue.Pop(), TMaybe<int>());
+        });
+        popper1.Start();
+        popper2.Start();
+
+        queue.Stop();
+
+        popper1.Join();
+        popper2.Join();
+    }
+
+    Y_UNIT_TEST(StopWhenMultiplePushers) {
+        NThreading::TBlockingQueue<int> queue(1);
+        queue.Push(1);
+        TFunctionThread pusher1([&] {
+            UNIT_ASSERT_VALUES_EQUAL(queue.Push(2), false);
+        });
+        TFunctionThread pusher2([&] {
+            UNIT_ASSERT_VALUES_EQUAL(queue.Push(2), false);
+        });
+        pusher1.Start();
+        pusher2.Start();
+
+        queue.Stop();
+
+        pusher1.Join();
+        pusher2.Join();
+    }
+
+    Y_UNIT_TEST(InterruptPopByDeadline) {
+        NThreading::TBlockingQueue<int> queue1(10);
+        NThreading::TBlockingQueue<int> queue2(10);
+
+        const auto popper1DeadLine = TInstant::Now();
+        const auto popper2DeadLine = TInstant::Now() + TDuration::Seconds(2);
+
+        TFunctionThread popper1([&] {
+            UNIT_ASSERT_VALUES_EQUAL(queue1.Pop(popper1DeadLine), TMaybe<int>());
+            UNIT_ASSERT_VALUES_EQUAL(queue1.IsStopped(), false);
+        });
+
+        TFunctionThread popper2([&] {
+            UNIT_ASSERT_VALUES_EQUAL(queue2.Pop(popper2DeadLine), 2);
+            UNIT_ASSERT_VALUES_EQUAL(queue2.IsStopped(), false);
+        });
+
+        popper1.Start();
+        popper2.Start();
+
+        Sleep(TDuration::Seconds(1));
+
+        queue1.Push(1);
+        queue2.Push(2);
+
+        Sleep(TDuration::Seconds(1));
+
+        queue1.Stop();
+        queue2.Stop();
+
+        popper1.Join();
+        popper2.Join();
+    }
+
+    Y_UNIT_TEST(InterruptPushByDeadline) {
+        NThreading::TBlockingQueue<int> queue1(1);
+        NThreading::TBlockingQueue<int> queue2(1);
+
+        queue1.Push(0);
+        queue2.Push(0);
+
+        const auto pusher1DeadLine = TInstant::Now();
+        const auto pusher2DeadLine = TInstant::Now() + TDuration::Seconds(2);
+
+        TFunctionThread pusher1([&] {
+            UNIT_ASSERT_VALUES_EQUAL(queue1.Push(1, pusher1DeadLine), false);
+            UNIT_ASSERT_VALUES_EQUAL(queue1.IsStopped(), false);
+        });
+
+        TFunctionThread pusher2([&] {
+            UNIT_ASSERT_VALUES_EQUAL(queue2.Push(2, pusher2DeadLine), true);
+            UNIT_ASSERT_VALUES_EQUAL(queue2.IsStopped(), false);
+        });
+
+        pusher1.Start();
+        pusher2.Start();
+
+        Sleep(TDuration::Seconds(1));
+
+        queue1.Pop();
+        queue2.Pop();
+
+        Sleep(TDuration::Seconds(1));
+
+        queue1.Stop();
+        queue2.Stop();
+
+        pusher1.Join();
+        pusher2.Join();
+    }
+}