1 files changed, 147 insertions, 0 deletions
diff --git a/src/rocksdb/utilities/blob_db/blob_db_iterator.h b/src/rocksdb/utilities/blob_db/blob_db_iterator.h
new file mode 100644
index 000000000..af07117eb
--- /dev/null
+++ b/src/rocksdb/utilities/blob_db/blob_db_iterator.h
@@ -0,0 +1,147 @@
+//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under both the GPLv2 (found in the
+//  COPYING file in the root directory) and Apache 2.0 License
+//  (found in the LICENSE.Apache file in the root directory).
+
+#pragma once
+#ifndef ROCKSDB_LITE
+
+#include "db/arena_wrapped_db_iter.h"
+#include "monitoring/statistics.h"
+#include "rocksdb/iterator.h"
+#include "util/stop_watch.h"
+#include "utilities/blob_db/blob_db_impl.h"
+
+namespace ROCKSDB_NAMESPACE {
+namespace blob_db {
+
+using ROCKSDB_NAMESPACE::ManagedSnapshot;
+
+class BlobDBIterator : public Iterator {
+ public:
+  BlobDBIterator(ManagedSnapshot* snapshot, ArenaWrappedDBIter* iter,
+                 BlobDBImpl* blob_db, Env* env, Statistics* statistics)
+      : snapshot_(snapshot),
+        iter_(iter),
+        blob_db_(blob_db),
+        env_(env),
+        statistics_(statistics) {}
+
+  virtual ~BlobDBIterator() = default;
+
+  bool Valid() const override {
+    if (!iter_->Valid()) {
+      return false;
+    }
+    return status_.ok();
+  }
+
+  Status status() const override {
+    if (!iter_->status().ok()) {
+      return iter_->status();
+    }
+    return status_;
+  }
+
+  void SeekToFirst() override {
+    StopWatch seek_sw(env_, statistics_, BLOB_DB_SEEK_MICROS);
+    RecordTick(statistics_, BLOB_DB_NUM_SEEK);
+    iter_->SeekToFirst();
+    while (UpdateBlobValue()) {
+      iter_->Next();
+    }
+  }
+
+  void SeekToLast() override {
+    StopWatch seek_sw(env_, statistics_, BLOB_DB_SEEK_MICROS);
+    RecordTick(statistics_, BLOB_DB_NUM_SEEK);
+    iter_->SeekToLast();
+    while (UpdateBlobValue()) {
+      iter_->Prev();
+    }
+  }
+
+  void Seek(const Slice& target) override {
+    StopWatch seek_sw(env_, statistics_, BLOB_DB_SEEK_MICROS);
+    RecordTick(statistics_, BLOB_DB_NUM_SEEK);
+    iter_->Seek(target);
+    while (UpdateBlobValue()) {
+      iter_->Next();
+    }
+  }
+
+  void SeekForPrev(const Slice& target) override {
+    StopWatch seek_sw(env_, statistics_, BLOB_DB_SEEK_MICROS);
+    RecordTick(statistics_, BLOB_DB_NUM_SEEK);
+    iter_->SeekForPrev(target);
+    while (UpdateBlobValue()) {
+      iter_->Prev();
+    }
+  }
+
+  void Next() override {
+    assert(Valid());
+    StopWatch next_sw(env_, statistics_, BLOB_DB_NEXT_MICROS);
+    RecordTick(statistics_, BLOB_DB_NUM_NEXT);
+    iter_->Next();
+    while (UpdateBlobValue()) {
+      iter_->Next();
+    }
+  }
+
+  void Prev() override {
+    assert(Valid());
+    StopWatch prev_sw(env_, statistics_, BLOB_DB_PREV_MICROS);
+    RecordTick(statistics_, BLOB_DB_NUM_PREV);
+    iter_->Prev();
+    while (UpdateBlobValue()) {
+      iter_->Prev();
+    }
+  }
+
+  Slice key() const override {
+    assert(Valid());
+    return iter_->key();
+  }
+
+  Slice value() const override {
+    assert(Valid());
+    if (!iter_->IsBlob()) {
+      return iter_->value();
+    }
+    return value_;
+  }
+
+  // Iterator::Refresh() not supported.
+
+ private:
+  // Return true if caller should continue to next value.
+  bool UpdateBlobValue() {
+    value_.Reset();
+    status_ = Status::OK();
+    if (iter_->Valid() && iter_->status().ok() && iter_->IsBlob()) {
+      Status s = blob_db_->GetBlobValue(iter_->key(), iter_->value(), &value_);
+      if (s.IsNotFound()) {
+        return true;
+      } else {
+        if (!s.ok()) {
+          status_ = s;
+        }
+        return false;
+      }
+    } else {
+      return false;
+    }
+  }
+
+  std::unique_ptr<ManagedSnapshot> snapshot_;
+  std::unique_ptr<ArenaWrappedDBIter> iter_;
+  BlobDBImpl* blob_db_;
+  Env* env_;
+  Statistics* statistics_;
+  Status status_;
+  PinnableSlice value_;
+};
+}  // namespace blob_db
+}  // namespace ROCKSDB_NAMESPACE
+#endif  // !ROCKSDB_LITE