| // Copyright 2016 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef SRC_LEDGER_BIN_STORAGE_IMPL_PAGE_STORAGE_IMPL_H_ |
| #define SRC_LEDGER_BIN_STORAGE_IMPL_PAGE_STORAGE_IMPL_H_ |
| |
| #include <lib/async/dispatcher.h> |
| #include <lib/callback/managed_container.h> |
| #include <lib/callback/operation_serializer.h> |
| #include <lib/fit/function.h> |
| #include <lib/fsl/vmo/sized_vmo.h> |
| |
| #include <vector> |
| |
| #include "peridot/lib/convert/convert.h" |
| #include "src/ledger/bin/encryption/public/encryption_service.h" |
| #include "src/ledger/bin/environment/environment.h" |
| #include "src/ledger/bin/storage/impl/live_commit_tracker.h" |
| #include "src/ledger/bin/storage/impl/page_db_impl.h" |
| #include "src/ledger/bin/storage/public/db.h" |
| #include "src/ledger/bin/storage/public/page_storage.h" |
| #include "src/ledger/bin/storage/public/page_sync_delegate.h" |
| #include "src/ledger/bin/storage/public/types.h" |
| #include "src/ledger/lib/coroutine/coroutine.h" |
| #include "src/ledger/lib/coroutine/coroutine_manager.h" |
| #include "src/lib/fxl/memory/ref_ptr.h" |
| #include "src/lib/fxl/observer_list.h" |
| #include "src/lib/fxl/strings/string_view.h" |
| |
| namespace storage { |
| |
| class PageStorageImpl : public PageStorage { |
| public: |
| PageStorageImpl(ledger::Environment* environment, |
| encryption::EncryptionService* encryption_service, |
| std::unique_ptr<Db> db, PageId page_id); |
| PageStorageImpl(ledger::Environment* environment, |
| encryption::EncryptionService* encryption_service, |
| std::unique_ptr<PageDb> page_db, PageId page_id); |
| |
| ~PageStorageImpl() override; |
| |
| // Initializes this PageStorageImpl. This includes initializing the underlying |
| // database and adding the default page head if the page is empty. |
| void Init(fit::function<void(Status)> callback); |
| |
| // Adds the given locally created |commit| in this |PageStorage|. |
| void AddCommitFromLocal(std::unique_ptr<const Commit> commit, |
| std::vector<ObjectIdentifier> new_objects, |
| fit::function<void(Status)> callback); |
| |
| // Checks whether the given |object_identifier| is untracked, i.e. has been |
| // created using |AddObjectFromLocal()|, but is not yet part of any commit. |
| // Untracked objects are invalid after the PageStorageImpl object is |
| // destroyed. |
| void ObjectIsUntracked(ObjectIdentifier object_identifier, |
| fit::function<void(Status, bool)> callback); |
| |
| // PageStorage: |
| PageId GetId() override; |
| void SetSyncDelegate(PageSyncDelegate* page_sync) override; |
| Status GetHeadCommits( |
| std::vector<std::unique_ptr<const Commit>>* head_commits) override; |
| void GetMergeCommitIds( |
| CommitIdView parent1_id, CommitIdView parent2_id, |
| fit::function<void(Status, std::vector<CommitId>)> callback) override; |
| void GetCommit(CommitIdView commit_id, |
| fit::function<void(Status, std::unique_ptr<const Commit>)> |
| callback) override; |
| void AddCommitsFromSync( |
| std::vector<CommitIdAndBytes> ids_and_bytes, ChangeSource source, |
| fit::function<void(Status, std::vector<CommitId>)> callback) override; |
| std::unique_ptr<Journal> StartCommit( |
| std::unique_ptr<const Commit> commit_id) override; |
| std::unique_ptr<Journal> StartMergeCommit( |
| std::unique_ptr<const Commit> left, |
| std::unique_ptr<const Commit> right) override; |
| void CommitJournal(std::unique_ptr<Journal> journal, |
| fit::function<void(Status, std::unique_ptr<const Commit>)> |
| callback) override; |
| void AddCommitWatcher(CommitWatcher* watcher) override; |
| void RemoveCommitWatcher(CommitWatcher* watcher) override; |
| void IsSynced(fit::function<void(Status, bool)> callback) override; |
| bool IsOnline() override; |
| void IsEmpty(fit::function<void(Status, bool)> callback) override; |
| void GetUnsyncedCommits( |
| fit::function<void(Status, std::vector<std::unique_ptr<const Commit>>)> |
| callback) override; |
| void MarkCommitSynced(const CommitId& commit_id, |
| fit::function<void(Status)> callback) override; |
| void GetUnsyncedPieces( |
| fit::function<void(Status, std::vector<ObjectIdentifier>)> callback) |
| override; |
| void MarkPieceSynced(ObjectIdentifier object_identifier, |
| fit::function<void(Status)> callback) override; |
| void IsPieceSynced(ObjectIdentifier object_identifier, |
| fit::function<void(Status, bool)> callback) override; |
| void MarkSyncedToPeer(fit::function<void(Status)> callback) override; |
| void AddObjectFromLocal( |
| ObjectType object_type, std::unique_ptr<DataSource> data_source, |
| ObjectReferencesAndPriority tree_references, |
| fit::function<void(Status, ObjectIdentifier)> callback) override; |
| void GetObjectPart( |
| ObjectIdentifier object_identifier, int64_t offset, int64_t max_size, |
| Location location, |
| fit::function<void(Status, fsl::SizedVmo)> callback) override; |
| void GetObject(ObjectIdentifier object_identifier, Location location, |
| fit::function<void(Status, std::unique_ptr<const Object>)> |
| callback) override; |
| void GetPiece(ObjectIdentifier object_identifier, |
| fit::function<void(Status, std::unique_ptr<const Piece>)> |
| callback) override; |
| void SetSyncMetadata(fxl::StringView key, fxl::StringView value, |
| fit::function<void(Status)> callback) override; |
| void GetSyncMetadata( |
| fxl::StringView key, |
| fit::function<void(Status, std::string)> callback) override; |
| |
| // Commit contents. |
| void GetCommitContents(const Commit& commit, std::string min_key, |
| fit::function<bool(Entry)> on_next, |
| fit::function<void(Status)> on_done) override; |
| void GetEntryFromCommit(const Commit& commit, std::string key, |
| fit::function<void(Status, Entry)> callback) override; |
| void GetCommitContentsDiff(const Commit& base_commit, |
| const Commit& other_commit, std::string min_key, |
| fit::function<bool(EntryChange)> on_next_diff, |
| fit::function<void(Status)> on_done) override; |
| void GetThreeWayContentsDiff(const Commit& base_commit, |
| const Commit& left_commit, |
| const Commit& right_commit, std::string min_key, |
| fit::function<bool(ThreeWayChange)> on_next_diff, |
| fit::function<void(Status)> on_done) override; |
| |
| private: |
| friend class PageStorageImplAccessorForTest; |
| |
| // A function that accepts a |piece|, an |object| and a |callback|. It |
| // attempts to extract references from the |piece| and the |object| (which |
| // must have the same object identifier) and to add the |piece| to storage |
| // with those references. On success, returns |object| to the |callback|. On |
| // failure, returns the error, and a nullptr as a second parameter (ie. drops |
| // the |object|). See |GetOrDownloadPiece| for details on usage. |
| using WritePieceCallback = fit::function<void( |
| std::unique_ptr<const Piece>, std::unique_ptr<const Object>, |
| fit::function<void(Status, std::unique_ptr<const Object>)>)>; |
| |
| // Marks all pieces needed for the given objects as local. |
| FXL_WARN_UNUSED_RESULT Status |
| MarkAllPiecesLocal(coroutine::CoroutineHandler* handler, PageDb::Batch* batch, |
| std::vector<ObjectIdentifier> object_identifiers); |
| |
| FXL_WARN_UNUSED_RESULT Status |
| ContainsCommit(coroutine::CoroutineHandler* handler, CommitIdView id); |
| |
| bool IsFirstCommit(CommitIdView id); |
| |
| // Adds the given synced |piece| object. |
| void AddPiece(std::unique_ptr<const Piece> piece, ChangeSource source, |
| IsObjectSynced is_object_synced, |
| ObjectReferencesAndPriority references, |
| fit::function<void(Status)> callback); |
| |
| // Returns the piece identified by |object_identifier|. |location| is either |
| // LOCAL and NETWORK, and defines whether the piece should be looked up |
| // remotely if not available locally. |
| // When the piece has been retrieved remotely, attempts to add it to storage |
| // before returning it. If this is not possible, ie. when the piece is an |
| // index tree-node that requires the full object to compute its references, |
| // also returns a WritePieceCallback. It is the callers responsability to |
| // invoke this callback to add the piece to storage once they have gathered |
| // the full object. |
| // The WritePieceCallback is safe to call as long as this class is valid. It |
| // should not outlive the returned piece (since a reference to the piece must |
| // be passed to it when invoked), and in practice should be called as soon as |
| // the full object containing the piece has been constructed to ensure data is |
| // persisted to disk as early as possible. |
| void GetOrDownloadPiece( |
| ObjectIdentifier object_identifier, Location location, |
| fit::function<void(Status, std::unique_ptr<const Piece>, |
| WritePieceCallback)> |
| callback); |
| |
| // Reads the content of a piece into a provided VMO. Takes into account the |
| // global offset and size in order to be able to read only the requested part |
| // of an object. |
| // |global_offset| is the offset from the beginning of the full object in |
| // bytes. |global_size| is the maximum size requested to be read into the vmo. |
| // |current_position| is the position of the currently read piece (defined by |
| // |object_identifier|) in the full object. |object_size| is the size of the |
| // currently read piece. |
| // |location| is either LOCAL and NETWORK and defines the behavior in the case |
| // where the object is not found locally. |
| void FillBufferWithObjectContent(const Piece& piece, fsl::SizedVmo vmo, |
| int64_t global_offset, int64_t global_size, |
| int64_t current_position, |
| int64_t object_size, Location location, |
| fit::function<void(Status)> callback); |
| |
| // Treating the |piece| as FileIndex, initializes a VMO of a needed size and |
| // calls FillBufferWithObjectContent on it. |
| // |offset| and |max_size| are used to denote partial mapping (see |
| // GetObjectPart for details). |
| void GetIndexObject(const Piece& piece, int64_t offset, int64_t max_size, |
| Location location, |
| fit::function<void(Status, fsl::SizedVmo)> callback); |
| |
| // Notifies the registered watchers of |new_commits|. |
| void NotifyWatchersOfNewCommits( |
| |
| const std::vector<std::unique_ptr<const Commit>>& new_commits, |
| ChangeSource source); |
| |
| // Synchronous versions of API methods using coroutines. |
| FXL_WARN_UNUSED_RESULT Status |
| SynchronousInit(coroutine::CoroutineHandler* handler); |
| |
| FXL_WARN_UNUSED_RESULT Status |
| SynchronousGetCommit(coroutine::CoroutineHandler* handler, CommitId commit_id, |
| std::unique_ptr<const Commit>* commit); |
| |
| FXL_WARN_UNUSED_RESULT Status |
| SynchronousAddCommitFromLocal(coroutine::CoroutineHandler* handler, |
| std::unique_ptr<const Commit> commit, |
| std::vector<ObjectIdentifier> new_objects); |
| |
| FXL_WARN_UNUSED_RESULT Status SynchronousAddCommitsFromSync( |
| coroutine::CoroutineHandler* handler, |
| std::vector<CommitIdAndBytes> ids_and_bytes, ChangeSource source, |
| std::vector<CommitId>* missing_ids); |
| |
| FXL_WARN_UNUSED_RESULT Status SynchronousGetUnsyncedCommits( |
| coroutine::CoroutineHandler* handler, |
| std::vector<std::unique_ptr<const Commit>>* unsynced_commits); |
| |
| FXL_WARN_UNUSED_RESULT Status SynchronousMarkCommitSynced( |
| coroutine::CoroutineHandler* handler, const CommitId& commit_id); |
| |
| FXL_WARN_UNUSED_RESULT Status SynchronousMarkCommitSyncedInBatch( |
| coroutine::CoroutineHandler* handler, PageDb::Batch* batch, |
| const CommitId& commit_id); |
| |
| FXL_WARN_UNUSED_RESULT Status SynchronousAddCommits( |
| coroutine::CoroutineHandler* handler, |
| std::vector<std::unique_ptr<const Commit>> commits, ChangeSource source, |
| std::vector<ObjectIdentifier> new_objects, |
| std::vector<CommitId>* missing_ids); |
| |
| FXL_WARN_UNUSED_RESULT Status |
| SynchronousAddPiece(coroutine::CoroutineHandler* handler, const Piece& piece, |
| ChangeSource source, IsObjectSynced is_object_synced, |
| ObjectReferencesAndPriority references); |
| |
| // Synchronous helper methods. |
| |
| // Marks this page as online. |
| FXL_WARN_UNUSED_RESULT Status SynchronousMarkPageOnline( |
| coroutine::CoroutineHandler* handler, PageDb::Batch* batch); |
| |
| // Updates the given |empty_node_id| to point to the empty node's |
| // ObjectIdentifier. |
| FXL_WARN_UNUSED_RESULT Status SynchronousGetEmptyNodeIdentifier( |
| coroutine::CoroutineHandler* handler, ObjectIdentifier** empty_node_id); |
| |
| ledger::Environment* environment_; |
| encryption::EncryptionService* const encryption_service_; |
| const PageId page_id_; |
| std::unique_ptr<PageDb> db_; |
| fxl::ObserverList<CommitWatcher> watchers_; |
| callback::ManagedContainer managed_container_; |
| PageSyncDelegate* page_sync_; |
| bool page_is_online_ = false; |
| std::unique_ptr<ObjectIdentifier> empty_node_id_ = nullptr; |
| LiveCommitTracker commit_tracker_; |
| |
| callback::OperationSerializer commit_serializer_; |
| coroutine::CoroutineManager coroutine_manager_; |
| |
| FXL_DISALLOW_COPY_AND_ASSIGN(PageStorageImpl); |
| }; |
| |
| } // namespace storage |
| |
| #endif // SRC_LEDGER_BIN_STORAGE_IMPL_PAGE_STORAGE_IMPL_H_ |