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

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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, 105 insertions, 0 deletions

diff --git a/yt/cpp/mapreduce/client/lock.cpp b/yt/cpp/mapreduce/client/lock.cpp
new file mode 100644
index 0000000000..88110f9266
--- /dev/null
+++ b/yt/cpp/mapreduce/client/lock.cpp
@@ -0,0 +1,105 @@
+#include "lock.h"
+
+#include "yt_poller.h"
+
+#include <yt/cpp/mapreduce/http/retry_request.h>
+
+#include <yt/cpp/mapreduce/common/retry_lib.h>
+
+#include <yt/cpp/mapreduce/raw_client/raw_batch_request.h>
+
+#include <util/string/builder.h>
+
+namespace NYT {
+namespace NDetail {
+
+using namespace NRawClient;
+
+////////////////////////////////////////////////////////////////////////////////
+
+class TLockPollerItem
+    : public IYtPollerItem
+{
+public:
+    TLockPollerItem(const TLockId& lockId, ::NThreading::TPromise<void> acquired)
+        : LockStateYPath_("#" + GetGuidAsString(lockId) + "/@state")
+        , Acquired_(acquired)
+    { }
+
+    void PrepareRequest(TRawBatchRequest* batchRequest) override
+    {
+        LockState_ = batchRequest->Get(TTransactionId(), LockStateYPath_, TGetOptions());
+    }
+
+    EStatus OnRequestExecuted() override
+    {
+        try {
+            const auto& state = LockState_.GetValue().AsString();
+            if (state == "acquired") {
+                Acquired_.SetValue();
+                return PollBreak;
+            }
+        } catch (const TErrorResponse& e) {
+            if (!IsRetriable(e)) {
+                Acquired_.SetException(std::current_exception());
+                return PollBreak;
+            }
+        } catch (const std::exception& e) {
+            if (!IsRetriable(e)) {
+                Acquired_.SetException(std::current_exception());
+                return PollBreak;
+            }
+        }
+        return PollContinue;
+    }
+
+    void OnItemDiscarded() override
+    {
+        Acquired_.SetException(std::make_exception_ptr(yexception() << "Operation cancelled"));
+    }
+
+private:
+    const TString LockStateYPath_;
+    ::NThreading::TPromise<void> Acquired_;
+
+    ::NThreading::TFuture<TNode> LockState_;
+};
+
+////////////////////////////////////////////////////////////////////////////////
+
+TLock::TLock(const TLockId& lockId, TClientPtr client, bool waitable)
+    : LockId_(lockId)
+    , Client_(std::move(client))
+{
+    if (!waitable) {
+        Acquired_ = ::NThreading::MakeFuture();
+    }
+}
+
+const TLockId& TLock::GetId() const
+{
+    return LockId_;
+}
+
+TNodeId TLock::GetLockedNodeId() const
+{
+    auto nodeIdNode = Client_->Get(
+        ::TStringBuilder() << '#' << GetGuidAsString(LockId_) << "/@node_id",
+        TGetOptions());
+    return GetGuid(nodeIdNode.AsString());
+}
+
+const ::NThreading::TFuture<void>& TLock::GetAcquiredFuture() const
+{
+    if (!Acquired_) {
+        auto promise = ::NThreading::NewPromise<void>();
+        Client_->GetYtPoller().Watch(::MakeIntrusive<TLockPollerItem>(LockId_, promise));
+        Acquired_ = promise.GetFuture();
+    }
+    return *Acquired_;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+} // namespace NDetail
+} // namespace NYT