/* filesystem_dec.cpp - base classes for any DEC file tree Copyright (c) 2022, Joerg Hoppe j_hoppe@t-online.de, www.retrocmp.com All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. - Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 06-jan-2022 JH created */ #include #include "logger.hpp" #include "filesystem_dec.hpp" #include "filesystem_host.hpp" // consumed event namespace sharedfilesystem { filesystem_dec_event_c::filesystem_dec_event_c() : filesystem_event_c() {} filesystem_dec_event_c::filesystem_dec_event_c( enum operation_e _operation, std::string _host_path, bool _is_dir, file_dec_stream_c *_stream) : filesystem_event_c() { operation = _operation ; host_path = _host_path ; is_dir = _is_dir ; dec_stream = _stream ; } std::string filesystem_dec_event_c::as_text() { assert(event_queue) ; filesystem_base_c *filesystem = event_queue->filesystem ; assert(filesystem) ; assert(dynamic_cast(dec_stream)) ; // delete events don't have file stream. const char *_host_path = (operation == op_delete) ? host_path.c_str() : dec_stream->host_path.c_str() ; return printf_to_string("DEC event \"%s\" on %s %s %s\n", operation_text().c_str(), filesystem->get_label().c_str(), is_dir? "dir" : "file", _host_path) ; } file_dec_stream_c::file_dec_stream_c(file_dec_c *_file, std::string _stream_name) { file = _file ; stream_name = _stream_name ; // file must've been added to filesystem, else get_host_path() will not work // can not testet here, if file is a stream, and called by file_c(): stream_c() // assert(file->filesystem != nullptr) ; // assert(file->parentdir != nullptr) ; } file_dec_stream_c::~file_dec_stream_c() { } // reset to constructor state void file_dec_stream_c::init() { set_size(0) ; } // on any change, host files for all streams are simultaneously touched // => produce the same events for all streams void file_dec_c::produce_event_for_all_streams(filesystem_event_queue_c *target_event_queue, filesystem_event_c::operation_e operation, bool is_dir) { for (unsigned i=0 ; i < get_stream_count() ; i++) { file_dec_stream_c* stream = get_stream(i) ; if (stream != nullptr) { // return original host path, if file created by host import assert(!stream->host_path.empty()) ; auto event = new filesystem_dec_event_c(operation, stream->host_path, is_dir, stream) ; target_event_queue->push(event) ; } } } filesystem_dec_c::filesystem_dec_c( storageimage_partition_c *_image_partition): filesystem_base_c() { image_partition = _image_partition ; image_partition->block_size = 0 ; // caller must set readonly = false ; // inherited from image } filesystem_dec_c::~filesystem_dec_c() { } // how many blocks are needed to hold "byte_count" bytes? unsigned filesystem_dec_c::needed_blocks(uint64_t byte_count) { unsigned block_size = get_block_size() ; return ((byte_count)+(block_size)-1) / (block_size) ; } unsigned filesystem_dec_c::needed_blocks(unsigned block_size, uint64_t byte_count) { return ((byte_count)+(block_size)-1) / (block_size) ; } // Recursive compare two directories A with B // When entries in A are missing in B: // add event of type "event_op_missing" to this->event_queue // When entries in A and B are different: // add event of type "event_op_differing" to this->event_queue void filesystem_dec_c::compare_directories( directory_dec_c *dir_a, directory_dec_c *dir_b, filesystem_event_queue_c *target_event_queue, filesystem_event_c::operation_e event_op_missing, bool produce_modify_event_on_difference) { assert(dir_a != nullptr) ; if (dir_b == nullptr) { // dir a is missing in b dir_a->produce_event_for_all_streams(target_event_queue, event_op_missing, true) ; return ; } // has dir node a changed against b? if (dir_a->data_changed(dir_b) && produce_modify_event_on_difference) { dir_a->produce_event_for_all_streams(target_event_queue, filesystem_event_c::op_modify, true) ; } // dir nodes exists on both dir_a and dir_b trees. recurse into. for(unsigned i = 0; i < dir_a->subdirectories.size(); ++i) { directory_dec_c *subdir_a, *subdir_b ; subdir_a = dynamic_cast(dir_a->subdirectories[i]) ; subdir_b = dynamic_cast(dir_b->filesystem->file_by_path.get(subdir_a->path)) ; // subdir_b maybe be null, handled in recursion compare_directories(subdir_a, subdir_b, target_event_queue, event_op_missing, produce_modify_event_on_difference) ; } // compare file lists for(unsigned i = 0; i < dir_a->files.size(); ++i) { file_dec_c *file_a, *file_b ; file_a = dynamic_cast(dir_a->files[i]) ; file_b = dynamic_cast(dir_b->filesystem->file_by_path.get(file_a->path)) ; if (file_b == nullptr) { // file a missing in b file_a->produce_event_for_all_streams(target_event_queue, event_op_missing, false) ; } else if (file_a->data_changed(file_b) && produce_modify_event_on_difference) { // file a and b different file_a->produce_event_for_all_streams(target_event_queue, filesystem_event_c::op_modify, false) ; } } } // compare "this" with an older snapshot, and push according events into queue void filesystem_dec_c::produce_events(filesystem_dec_c *metadata_snapshot) { directory_dec_c *cur_rootdir = dynamic_cast(this->rootdir) ; directory_dec_c *metadata_snapshot_rootdir = dynamic_cast(metadata_snapshot->rootdir) ; // scan cur for new entries (not in metadata_snapshot) compare_directories(cur_rootdir, metadata_snapshot_rootdir, &event_queue, filesystem_event_c::op_create, true) ; // scan metadata_snapshot for deleted entries (not in cur anymore). ignore changes, scanned above compare_directories(metadata_snapshot_rootdir, cur_rootdir, &event_queue, filesystem_event_c::op_delete, false) ; } void filesystem_dec_c::consume_event(filesystem_host_event_c *event) { DEBUG("%s: filesystem_dec_c::consume_event(): %s", get_label().c_str(), event->as_text().c_str()) ; if (event->operation == filesystem_event_c::op_create) { import_host_file(event->host_file) ; } else if (event->operation == filesystem_event_c::op_modify) { // change as delete-create pair delete_host_file(event->host_path) ; import_host_file(event->host_file) ; } else if (event->operation == filesystem_event_c::op_delete) { delete_host_file(event->host_path) ; } delete event ; } // create file system info and write to host // VOLUMNE INFO not part of DEC filesystem, but part of host file system void filesystem_dec_c::update_host_volume_info(std::string root_path) { std::stringstream buffer ; // printf("DEC filesystem changed, %s updated\n", volume_info_host_path.c_str()) ; produce_volume_info(buffer) ; std::ofstream fout(root_path + "/" + volume_info_host_path) ; fout << buffer.str() ; } } // namespace