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#include "common.hh"
#include "files_finder.hh"
#include "io.hh"
#include "logger.hh"
#include "task_runner.hh"
#include "unique_fd.hh"
#include "weak_ptr.hh"
#include <condition_variable>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <mutex>
#include <optional>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
namespace {
constexpr uint8_t kMaxQueued = 128;
class FilesFinderImpl : public FilesFinder {
public:
FilesFinderImpl(
std::shared_ptr<Logger> logger,
std::shared_ptr<TaskRunner> runner,
std::filesystem::path root,
Delegate* delegate,
size_t threads)
: logger_(std::move(logger)), runner_(std::move(runner)),
workers_(TaskRunner::create(threads)), root_(std::move(root)),
delegate_(delegate) {
workers_->post(std::bind(&FilesFinderImpl::open_root, this));
}
private:
void open_root() {
unique_fd fd = io::open(
root_, io::open_flags::rdonly | io::open_flags::directory);
if (fd) {
increment_queued();
list_dir(std::move(fd), root_, 0);
} else {
logger_->warn("Unable to open %s: %s", root_.c_str(), strerror(errno));
runner_->post(std::bind(&Delegate::done, delegate_));
}
}
void open_dir(int fd, std::filesystem::path path, uint16_t depth) {
list_dir(unique_fd(fd), path, depth);
}
void list_dir(unique_fd fd, std::filesystem::path path, uint16_t depth) {
DIR* dh = fdopendir(fd.get());
if (!dh) {
logger_->warn("Unable to list %s: %s", path.c_str(), strerror(errno));
return;
}
fd.release(); // fd is now owned by dh
while (true) {
errno = 0;
auto* de = readdir(dh);
if (!de) {
if (errno)
logger_->warn("Error listing %s: %s", path.c_str(), strerror(errno));
break;
}
size_t namlen;
#ifdef _DIRENT_HAVE_D_NAMLEN
namlen = de->d_namlen;
#else
namlen = strlen(de->d_name);
#endif
if (namlen == 2 && de->d_name[0] == '.' && de->d_name[1] == '.')
continue;
std::optional<bool> is_dir;
#ifdef _DIRENT_HAVE_D_TYPE
switch (de->d_type) {
case DT_DIR:
is_dir = true;
break;
case DT_CHR:
case DT_FIFO:
case DT_BLK:
case DT_REG:
case DT_SOCK:
case DT_WHT:
is_dir = false;
break;
case DT_LNK:
case DT_UNKNOWN:
default:
break;
}
#endif
if (!is_dir.has_value()) {
struct stat buf;
if (fstatat(dirfd(dh), de->d_name, &buf, 0)) {
logger_->warn("Unable to stat: %s/%s: %s",
path.c_str(), de->d_name, strerror(errno));
continue;
}
is_dir = S_ISDIR(buf.st_mode);
}
std::string_view name(de->d_name, namlen);
if (is_dir.value()) {
if (delegate_->include_dir(name, depth)) {
unique_fd new_fd = io::openat(
dirfd(dh), de->d_name,
io::open_flags::rdonly | io::open_flags::directory);
if (new_fd) {
increment_queued();
workers_->post(std::bind(&FilesFinderImpl::open_dir, this,
new_fd.release(), path / name,
depth + 1));
} else {
logger_->warn("Unable to open %s/%s: %s", path.c_str(), de->d_name,
strerror(errno));
}
}
} else {
if (delegate_->include_file(name, depth)) {
increment_active();
runner_->post(std::bind(
&FilesFinderImpl::weak_call_file,
weak_ptr_owner_.get(),
path / name));
}
}
}
closedir(dh);
decrement_queued();
}
void increment_queued() {
// Queued is used both to keep track of when done() should be called
// but also to max sure we don't queued too many directories as
// each queued entry costs one open file.
std::unique_lock<std::mutex> lock(queued_mutex_);
while (queued_ >= kMaxQueued) {
queued_cond_.wait(lock);
}
++queued_;
}
void increment_active() {
std::lock_guard<std::mutex> lock(queued_mutex_);
++active_;
}
void decrement_queued() {
bool notify;
bool post_done;
{
std::lock_guard<std::mutex> lock(queued_mutex_);
notify = queued_ >= kMaxQueued;
--queued_;
post_done = queued_ == 0 && active_ == 0;
}
if (notify)
queued_cond_.notify_one();
if (post_done)
runner_->post(std::bind(&Delegate::done, delegate_));
}
void decrement_active() {
bool post_done;
{
std::lock_guard<std::mutex> lock(queued_mutex_);
--active_;
post_done = queued_ == 0 && active_ == 0;
}
if (post_done)
runner_->post(std::bind(&Delegate::done, delegate_));
}
static void weak_call_file(std::shared_ptr<WeakPtr<FilesFinderImpl>> weak_ptr,
std::filesystem::path path) {
auto* ptr = weak_ptr->get();
if (ptr)
ptr->call_file(std::move(path));
}
void call_file(std::filesystem::path path) {
delegate_->file(std::move(path));
decrement_active();
}
std::shared_ptr<Logger> logger_;
std::shared_ptr<TaskRunner> runner_;
std::shared_ptr<TaskRunner> workers_;
std::filesystem::path const root_;
Delegate* const delegate_;
std::mutex queued_mutex_;
std::condition_variable queued_cond_;
uint8_t queued_{0};
size_t active_{0};
WeakPtrOwner<FilesFinderImpl> weak_ptr_owner_{this};
};
} // namespace
bool FilesFinder::Delegate::include_file(std::string_view name,
uint16_t /* depth */) const {
return name.empty() || name.front() != '.';
}
bool FilesFinder::Delegate::include_dir(std::string_view name,
uint16_t /* depth */) const {
return name.empty() || name.front() != '.';
}
void FilesFinder::Delegate::done() {}
std::unique_ptr<FilesFinder> FilesFinder::create(
std::shared_ptr<Logger> logger,
std::shared_ptr<TaskRunner> runner,
std::filesystem::path root,
Delegate* delegate,
size_t threads) {
return std::make_unique<FilesFinderImpl>(std::move(logger), std::move(runner),
std::move(root), delegate, threads);
}
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