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#include <chrono>
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#include <iostream>
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#include <iterator> // temporary for std::distance
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include "PhotoCompressArchiver.hh"
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#define OUT(x) {\
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std::lock_guard<std::mutex> lock(m_output_mutex);\
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x\
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}
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const char *PROG_NAME = "./packJPG";
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const char *PROG_OPT1 = "-np";
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const char *PROG_OPT2 = "-o";
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const char *PROG_OPT3 = "-p";
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PhotoCompressArchiver::PhotoCompressArchiver(
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const char* path,
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uint32_t num_cores)
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: m_path(path),
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m_num_cores(num_cores),
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m_num_input_files(0),
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m_total_uncompressed_size(0),
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m_total_compressed_size(0),
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p_finder_thread(nullptr)
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{}
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PhotoCompressArchiver::~PhotoCompressArchiver()
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{}
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int PhotoCompressArchiver::execute()
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{
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// Start the file finder thread
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OUT(std::cout << "Starting file finder..." << std::flush;);
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p_finder_thread = new std::thread(&PhotoCompressArchiver::find_files, this,
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m_path, JPEG_REGEX);
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OUT(std::cout << "DONE" << std::endl;)
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p_finder_thread->join();
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OUT(std::cout << "File finder completed:" << std::endl;)
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OUT(std::cout << " Found " << m_num_input_files << " images" << std::endl;)
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OUT(std::cout << " Total uncompressed bytes: " << m_total_uncompressed_size
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<< "\n" << std::endl;)
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// Start worker threads
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OUT(std::cout << "Starting worker threads..." << std::endl;)
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// TODO: need to handle the cause were number of input files is less than
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// the number of threads
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uint32_t num_threads = m_num_cores;
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uint32_t sublist_len = m_num_input_files / num_threads;
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for (uint32_t idx = 0; idx < num_threads; ++idx)
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{
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// Subdivide the input file list (using the vector copy constructor
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// and start/end iterators)
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decltype(m_file_list.begin()) start_iter;
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decltype(m_file_list.begin()) end_iter;
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if (idx == (num_threads - 1))
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{
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// Make sure the last sublist goes all the way to the end of the
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// input file list (if number of images is not an even multiple of
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// number of threads)
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start_iter = m_file_list.begin() + (idx * sublist_len);
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end_iter = m_file_list.end();
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}
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else
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{
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start_iter = m_file_list.begin() + (idx * sublist_len);
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end_iter = m_file_list.begin() + ((idx + 1) * sublist_len);
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}
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auto sublist = new std::vector<bfs::path>(start_iter, end_iter);
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// Spawn worker thread and add to list for bookkeeping
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std::thread* worker = new std::thread(&PhotoCompressArchiver::fork_worker,
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this, idx, sublist);
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m_worker_threads.push_back(worker);
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}
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OUT(std::cout << "All worker threads started" << std::endl;)
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// Clean up the finder thread
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delete p_finder_thread;
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p_finder_thread = nullptr;
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// Now join the worker threads
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for (auto worker : m_worker_threads)
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{
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worker->join();
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delete worker;
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}
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OUT(std::cout << " Total compressed bytes: " << m_total_compressed_size
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<< std::endl;)
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// Calculate and display ratio
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double ratio = (double)m_total_compressed_size / m_total_uncompressed_size;
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OUT(std::cout << " Compression ratio: " << ratio << "\n" << std::endl;)
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OUT(std::cout << "execute terminating" << std::endl;)
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return 0;
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}
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void PhotoCompressArchiver::find_files(
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const bfs::path& dir_path,
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const boost::regex& file_regex)
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{
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bfs::directory_iterator end_iter;
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for (bfs::directory_iterator dir_iter(dir_path); dir_iter != end_iter; ++dir_iter)
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{
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if (bfs::is_directory(dir_iter->status()))
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{
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// Found directory recurse
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find_files(dir_iter->path(), file_regex);
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}
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else if (boost::regex_match(dir_iter->path().filename().string(), file_regex))
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{
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// Found file match
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m_file_list.push_back(dir_iter->path());
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++m_num_input_files;
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// Stat the file to get its size
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struct stat statbuf;
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int rc = stat(dir_iter->path().string().c_str(), &statbuf);
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if (rc)
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{
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OUT(std::cerr << "ERROR: unable to stat file "
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<< dir_iter->path() << std::endl;)
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}
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m_total_uncompressed_size += statbuf.st_size;
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}
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}
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}
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void PhotoCompressArchiver::fork_worker(
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uint32_t tid,
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std::vector<bfs::path>* file_sublist)
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{
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OUT(std::cout << "T[" << tid << "] top of the morning to ya" << std::endl;)
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// Print out the input files given to this worker
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#if 0
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for (auto& filepath : *file_sublist)
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{
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OUT(std::cout << "T[" << tid << "] file: " << filepath.string()
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<< std::endl;)
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}
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#endif
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uint32_t argv_size = file_sublist->size() + 5;
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const char **exec_argv = new const char* [argv_size];
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// Build the argv array; pass in default program options
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exec_argv[0] = &PROG_NAME[2]; // discard leading "./"
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exec_argv[1] = PROG_OPT1;
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exec_argv[2] = PROG_OPT2;
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exec_argv[3] = PROG_OPT3;
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// Add the sublist files to the argv array
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uint32_t idx = 4;
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for (auto& image_path : *file_sublist)
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{
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exec_argv[idx++] = image_path.string().c_str();
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}
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exec_argv[argv_size - 1] = nullptr;
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// Create a pipe to hold stdout from child process
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int filedes[2];
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if (pipe(filedes) == -1)
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{
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perror("pipe");
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exit(1);
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}
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// Fork off the childprocess
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//~ pid_t parent = getpid();
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pid_t pid = vfork();
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if (pid == -1)
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{
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// error, failed to fork()
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OUT(std::cout << "T[" << tid << "] fork failed!" << std::endl;)
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}
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else if (pid > 0)
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{
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// Wait for forked child process to terminate
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int status;
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waitpid(pid, &status, 0);
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OUT(std::cout << "T[" << tid << "] RC: " << status << std::endl;)
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}
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else
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{
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// Set child process's stdout to the pipe entry
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while ((dup2(filedes[1], STDOUT_FILENO) == -1) && (errno == EINTR)) {}
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close(filedes[1]);
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close(filedes[0]);
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// Child after fork
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execv(PROG_NAME, (char **)exec_argv);
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_exit(EXIT_FAILURE); // exec never returns
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}
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// Free up the argv array
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delete[] exec_argv;
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OUT(std::cout << "T[" << tid << "] compression complete" << std::endl;)
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// Iterate over the files and find their compressed size
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std::string new_file;
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for (auto& filepath : *file_sublist)
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{
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// Create new filename that contains the ".jpg" replaced with ".pjg"
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uint32_t end_pos = filepath.string().find(".");
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new_file.assign(filepath.string().begin(),
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filepath.string().begin() + end_pos);
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new_file += ".pjg";
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// Stat the file to get its size
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struct stat statbuf;
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int rc = stat(new_file.c_str(), &statbuf);
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if (rc)
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{
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OUT(std::cerr << "T[" << tid << "] ERROR: unable to stat file "
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<< new_file << std::endl;)
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}
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m_total_compressed_size += statbuf.st_size;
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}
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OUT(std::cout << "T[" << tid << "] terminating" << std::endl;)
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}
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