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https://github.com/nestriness/cdc-file-transfer.git
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4326e972ac
The tools allow efficient and fast synchronization of large directory trees from a Windows workstation to a Linux target machine. cdc_rsync* support efficient copy of files by using content-defined chunking (CDC) to identify chunks within files that can be reused. asset_stream_manager + cdc_fuse_fs support efficient streaming of a local directory to a remote virtual file system based on FUSE. It also employs CDC to identify and reuse unchanged data chunks.
95 lines
3.4 KiB
C++
95 lines
3.4 KiB
C++
/*
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* Copyright 2022 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MANIFEST_MANIFEST_ITERATOR_H_
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#define MANIFEST_MANIFEST_ITERATOR_H_
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#include <list>
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#include "data_store/data_store_reader.h"
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namespace cdc_ft {
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class ManifestIterator {
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public:
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// Constructs a new manifest iterator that can read a manifest proto from the
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// given |chunk_store|.
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explicit ManifestIterator(DataStoreReader* data_store);
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~ManifestIterator();
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// Opens the manifest identified by |manifest_id| from the chunk store. If
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// this method returns an Ok() status, an AssetProto may be fetched by
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// calling NextEntry(). In case of an error, the value of Status() is
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// returned.
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absl::Status Open(const ContentIdProto& manifest_id);
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// Opens the manifest stored in the file path given as |manifest_file|.
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// Further chunks will be read from the chunk store, if needed. If this method
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// returns an Ok() status, an AssetProto may be fetched by calling
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// NextEntry(). In case of an error, the value of Status() is returned.
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absl::Status Open(const std::string& manifest_file);
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// Returns any error that might have occured so far.
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absl::Status Status() const { return status_; }
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// Returns true as long as a manifest has been opened, no error has occured,
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// and a call to NextEntry() has a chance to succeed.
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bool Valid() const;
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// Yields the next asset from the opened manifest. Returns nullptr in case of
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// an error or if no more assets are available. Check Status() to distinguish
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// between those two cases.
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//
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// Calling NextEntry() invalidates any references to objects returned by
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// previous calls to this function.
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const AssetProto* NextEntry();
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// Returns the current relative path. This corresponds to the directory path
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// in which the asset returned from the last call to NextEntry() is located,
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// relative to the manifest root.
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const std::string& RelativePath() const { return rel_path_; }
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// Returns a reference to the loaded manifest proto. Only valid after a
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// successful call to Open().
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const ManifestProto& Manifest() const { return manifest_; }
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private:
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struct OpenedDirectory;
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// Resets the iterator for a new Open() call.
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void Reset();
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// Returns the AssetProto at |index| from the given list |assets|. If the
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// AssetProto is of type DIRECTORY, it is pushed on top of the stack of open
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// directories. Does not check if |index| is out-of-bounds.
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AssetProto* MutableAsset(RepeatedAssetProto* assets, int index);
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// Updates the relative path according to the current stack of opened
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// directories.
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void UpdateRelPath(const OpenedDirectory* od);
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ManifestProto manifest_;
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std::list<OpenedDirectory> dirs_;
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const OpenedDirectory* last_opened_dir_;
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std::string rel_path_;
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absl::Status status_;
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DataStoreReader* data_store_;
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};
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} // namespace cdc_ft
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#endif // MANIFEST_MANIFEST_ITERATOR_H_
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