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/** |
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* This file is part of the CernVM File System. |
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* |
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* The SyncMediator is an intermediate layer between the UnionSync |
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* implementation and the CatalogManager. |
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* It's main responsibility is to unwind file system intrinsics as |
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* deleting all files in a deleted directory. Furthermore newly |
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* created directories are recursed and all included files are |
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* added as a whole (performance improvement). |
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* |
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* Furthermore it keeps track of hard link relations. As we cannot store the |
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* transient inode of the union file system in cvmfs, we just keep track of |
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* hard link relations itself. Inodes will be assigned at run time of the CVMFS |
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* client taking these relations into account. |
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* |
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* Another responsibility of this class is the creation and destruction |
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* of nested catalogs. If a .cvmfscatalog magic file is encountered, |
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* either on delete or add, it will be treated as nested catalog change. |
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* |
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* New and modified files are piped to external processes for hashing and |
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* compression. Results come back in a pipe. |
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*/ |
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#ifndef CVMFS_SYNC_MEDIATOR_H_ |
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#define CVMFS_SYNC_MEDIATOR_H_ |
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#include <pthread.h> |
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#include <map> |
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#include <stack> |
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#include <string> |
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#include <vector> |
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#include "catalog_mgr_rw.h" |
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#include "compression/compression.h" |
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#include "file_chunk.h" |
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#include "publish/repository.h" |
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#include "statistics.h" |
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#include "swissknife_sync.h" |
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#include "sync_item.h" |
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#include "util/pointer.h" |
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#include "util/shared_ptr.h" |
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#include "xattr.h" |
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namespace manifest { |
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class Manifest; |
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} |
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namespace publish { |
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class SyncDiffReporter : public DiffListener { |
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public: |
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enum PrintAction { |
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kPrintDots, |
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kPrintChanges |
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}; |
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explicit SyncDiffReporter(PrintAction print_action = kPrintChanges, |
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unsigned int processing_dot_interval = 100) |
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: print_action_(print_action) |
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, processing_dot_interval_(processing_dot_interval) |
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, changed_items_(0) { } |
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virtual void OnInit(const history::History::Tag &from_tag, |
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const history::History::Tag &to_tag); |
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virtual void OnStats(const catalog::DeltaCounters &delta); |
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virtual void OnAdd(const std::string &path, |
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const catalog::DirectoryEntry &entry); |
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virtual void OnRemove(const std::string &path, |
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const catalog::DirectoryEntry &entry); |
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virtual void OnModify(const std::string &path, |
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const catalog::DirectoryEntry &entry_from, |
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const catalog::DirectoryEntry &entry_to); |
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void CommitReport(); |
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private: |
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void PrintDots(); |
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void AddImpl(const std::string &path); |
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void RemoveImpl(const std::string &path); |
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void ModifyImpl(const std::string &path); |
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PrintAction print_action_; |
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unsigned int processing_dot_interval_; |
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unsigned int changed_items_; |
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}; |
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/** |
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* If we encounter a file with linkcount > 1 it will be added to a HardlinkGroup |
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* After processing all files, the HardlinkGroups are populated with |
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* related hardlinks |
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* Assertion: linkcount == HardlinkGroup::hardlinks.size() at the end |
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*/ |
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struct HardlinkGroup { |
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explicit HardlinkGroup(const SharedPtr<SyncItem> &item) : master(item) { |
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hardlinks[master->GetRelativePath()] = item; |
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} |
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void AddHardlink(const SharedPtr<SyncItem> &entry) { |
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hardlinks[entry->GetRelativePath()] = entry; |
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} |
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SharedPtr<SyncItem> master; |
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SyncItemList hardlinks; |
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FileChunkList file_chunks; |
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}; |
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class AbstractSyncMediator { |
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public: |
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virtual ~AbstractSyncMediator() = 0; |
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virtual void RegisterUnionEngine(SyncUnion *engine) = 0; |
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virtual void Add(SharedPtr<SyncItem> entry) = 0; |
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virtual void Touch(SharedPtr<SyncItem> entry) = 0; |
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virtual void Remove(SharedPtr<SyncItem> entry, bool fast_delete = false) = 0; |
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virtual void Replace(SharedPtr<SyncItem> entry) = 0; |
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virtual void Clone(const std::string from, const std::string to) = 0; |
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virtual void AddUnmaterializedDirectory(SharedPtr<SyncItem> entry) = 0; |
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virtual void EnterDirectory(SharedPtr<SyncItem> entry) = 0; |
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virtual void LeaveDirectory(SharedPtr<SyncItem> entry) = 0; |
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virtual bool Commit(manifest::Manifest *manifest) = 0; |
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virtual bool IsExternalData() const = 0; |
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virtual bool IsDirectIo() const = 0; |
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virtual zlib::Algorithms GetCompressionAlgorithm() const = 0; |
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}; |
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/** |
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* Mapping of inode number to the related HardlinkGroup. |
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*/ |
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typedef std::map<uint64_t, HardlinkGroup> HardlinkGroupMap; |
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/** |
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* The SyncMediator refines the input received from a concrete UnionSync object. |
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* For example, it resolves the insertion and deletion of complete directories |
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* by recursing them. It works as a mediator between the union file system and |
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* forwards the correct database commands to the catalog handler to sync the |
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* changes into the repository. |
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* Furthermore it sends new and modified files to the spooler for compression |
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* and hashing. |
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*/ |
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class SyncMediator : public virtual AbstractSyncMediator { |
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public: |
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static const unsigned int processing_dot_interval = 100; |
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SyncMediator(catalog::WritableCatalogManager *catalog_manager, |
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const SyncParameters *params, |
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perf::StatisticsTemplate statistics); |
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void RegisterUnionEngine(SyncUnion *engine); |
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// Final class, it is not meant to be derived any further |
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~SyncMediator(); |
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void Add(SharedPtr<SyncItem> entry); |
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void Touch(SharedPtr<SyncItem> entry); |
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void Remove(SharedPtr<SyncItem> entry, bool fast_delete = false); |
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void Replace(SharedPtr<SyncItem> entry); |
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void Clone(const std::string from, const std::string to); |
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void AddUnmaterializedDirectory(SharedPtr<SyncItem> entry); |
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void EnterDirectory(SharedPtr<SyncItem> entry); |
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void LeaveDirectory(SharedPtr<SyncItem> entry); |
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bool Commit(manifest::Manifest *manifest); |
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// The sync union engine uses this information to create properly initialized |
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// sync items |
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bool IsExternalData() const { return params_->external_data; } |
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bool IsDirectIo() const { return params_->direct_io; } |
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zlib::Algorithms GetCompressionAlgorithm() const { |
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return params_->compression_alg; |
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} |
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private: |
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typedef std::stack<HardlinkGroupMap> HardlinkGroupMapStack; |
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typedef std::vector<HardlinkGroup> HardlinkGroupList; |
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void EnsureAllowed(SharedPtr<SyncItem> entry); |
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// Called after figuring out the type of a path (file, symlink, dir) |
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void AddFile(SharedPtr<SyncItem> entry); |
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void RemoveFile(SharedPtr<SyncItem> entry); |
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void AddDirectory(SharedPtr<SyncItem> entry); |
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void RemoveDirectory(SharedPtr<SyncItem> entry); |
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void TouchDirectory(SharedPtr<SyncItem> entry); |
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void CreateNestedCatalog(SharedPtr<SyncItem> directory); |
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void RemoveNestedCatalog(SharedPtr<SyncItem> directory); |
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void TouchDirectoryRecursively(SharedPtr<SyncItem> entry); |
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void TouchingFileCallback(const std::string &parent_dir, |
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const std::string &file_name); |
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void TouchingSymlinkCallback(const std::string &parent_dir, |
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const std::string &link_name); |
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void TouchDirectoryCallback(const std::string &parent_dir, |
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const std::string &dir_name); |
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void RemoveDirectoryRecursively(SharedPtr<SyncItem> entry, |
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bool fast_delete = false); |
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void RemoveFileCallback(const std::string &parent_dir, |
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const std::string &file_name); |
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void RemoveSymlinkCallback(const std::string &parent_dir, |
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const std::string &link_name); |
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void RemoveCharacterDeviceCallback(const std::string &parent_dir, |
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const std::string &link_name); |
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void RemoveBlockDeviceCallback(const std::string &parent_dir, |
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const std::string &link_name); |
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void RemoveFifoCallback(const std::string &parent_dir, |
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const std::string &link_name); |
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void RemoveSocketCallback(const std::string &parent_dir, |
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const std::string &link_name); |
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void RemoveDirectoryCallback(const std::string &parent_dir, |
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const std::string &dir_name); |
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bool IgnoreFileCallback(const std::string &parent_dir, |
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const std::string &file_name); |
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// Called by file system traversal |
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void EnterAddedDirectoryCallback(const std::string &parent_dir, |
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const std::string &dir_name); |
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void LeaveAddedDirectoryCallback(const std::string &parent_dir, |
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const std::string &dir_name); |
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void AddDirectoryRecursively(SharedPtr<SyncItem> entry); |
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bool AddDirectoryCallback(const std::string &parent_dir, |
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const std::string &dir_name); |
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void AddFileCallback(const std::string &parent_dir, |
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const std::string &file_name); |
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void AddCharacterDeviceCallback(const std::string &parent_dir, |
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const std::string &file_name); |
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void AddBlockDeviceCallback(const std::string &parent_dir, |
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const std::string &file_name); |
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void AddFifoCallback(const std::string &parent_dir, |
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const std::string &file_name); |
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void AddSocketCallback(const std::string &parent_dir, |
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const std::string &file_name); |
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void AddSymlinkCallback(const std::string &parent_dir, |
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const std::string &link_name); |
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SharedPtr<SyncItem> CreateSyncItem(const std::string &relative_parent_path, |
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const std::string &filename, |
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const SyncItemType entry_type) const; |
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// Called by Upload Spooler |
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void PublishFilesCallback(const upload::SpoolerResult &result); |
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void PublishHardlinksCallback(const upload::SpoolerResult &result); |
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// Hardlink handling |
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void CompleteHardlinks(SharedPtr<SyncItem> entry); |
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HardlinkGroupMap &GetHardlinkMap() { return hardlink_stack_.top(); } |
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void LegacyRegularHardlinkCallback(const std::string &parent_dir, |
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const std::string &file_name); |
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void LegacySymlinkHardlinkCallback(const std::string &parent_dir, |
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const std::string &file_name); |
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void LegacyCharacterDeviceHardlinkCallback(const std::string &parent_dir, |
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const std::string &file_name); |
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void LegacyBlockDeviceHardlinkCallback(const std::string &parent_dir, |
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const std::string &file_name); |
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void LegacyFifoHardlinkCallback(const std::string &parent_dir, |
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const std::string &file_name); |
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void LegacySocketHardlinkCallback(const std::string &parent_dir, |
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const std::string &file_name); |
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void InsertLegacyHardlink(SharedPtr<SyncItem> entry); |
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uint64_t GetTemporaryHardlinkGroupNumber(SharedPtr<SyncItem> entry) const; |
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void InsertHardlink(SharedPtr<SyncItem> entry); |
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void AddLocalHardlinkGroups(const HardlinkGroupMap &hardlinks); |
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void AddHardlinkGroup(const HardlinkGroup &group); |
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catalog::WritableCatalogManager *catalog_manager_; |
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SyncUnion *union_engine_; |
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bool handle_hardlinks_; |
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/** |
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* When fast_delete is requested but the target path is not a nested catalog |
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* transition point, we fall back to filesystem traversal. This flag ensures |
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* that any nested catalog transition points encountered during the traversal |
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* are still fast-deleted instead of being recursively traversed. |
| 280 |
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*/ |
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bool recursive_fast_delete_; |
| 282 |
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/** |
| 284 |
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* Hardlinks are supported as long as they all reside in the same directory. |
| 285 |
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* If a recursion enters a directory, we push an empty HardlinkGroupMap to |
| 286 |
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* keep track of the hardlinks of this directory. |
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* When leaving a directory (i.e. it is completely processed) the stack is |
| 288 |
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* popped and the HardlinkGroupMap is processed. |
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*/ |
| 290 |
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HardlinkGroupMapStack hardlink_stack_; |
| 291 |
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/** |
| 293 |
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* New and modified files are sent to an external spooler for hashing and |
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* compression. A spooler callback adds them to the catalogs, once processed. |
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*/ |
| 296 |
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pthread_mutex_t lock_file_queue_; |
| 297 |
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SyncItemList file_queue_; |
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HardlinkGroupList hardlink_queue_; |
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const SyncParameters *params_; |
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mutable unsigned int changed_items_; |
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/** |
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* By default, files have no extended attributes. |
| 306 |
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*/ |
| 307 |
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XattrList default_xattrs_; |
| 308 |
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UniquePtr<perf::FsCounters> counters_; |
| 309 |
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UniquePtr<SyncDiffReporter> reporter_; |
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}; // class SyncMediator |
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} // namespace publish |
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#endif // CVMFS_SYNC_MEDIATOR_H_ |
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