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#include "common.hh"
#include "hash_method.hh"
#include "hasher.hh"
#include "io.hh"
#include "logger.hh"
#include "task_runner.hh"
#include <errno.h>
#include <string.h>
namespace {
class HasherImpl : public Hasher {
public:
HasherImpl(std::shared_ptr<Logger> logger,
std::shared_ptr<TaskRunner> runner,
size_t threads)
: logger_(std::move(logger)), runner_(std::move(runner)),
workers_(TaskRunner::create(threads)) {
}
void hash(std::filesystem::path path,
std::function<void(std::string, uint64_t)> callback) override {
workers_->post(std::bind(&HasherImpl::do_hash, this, path, callback));
}
private:
void do_hash(std::filesystem::path path,
std::function<void(std::string, uint64_t)> callback) {
auto fd = io::open(path, io::open_flags::rdonly);
std::string result;
uint64_t size = 0;
if (fd) {
auto method = HashMethod::sha256();
char buffer[1 * 1024 * 1024];
while (true) {
auto got = io::read(fd.get(), buffer, sizeof(buffer));
if (got < 0) {
logger_->warn("Error reading: %s: %s", path.c_str(),
strerror(errno));
size = 0;
break;
}
if (got == 0) {
result = method->finish();
break;
}
size += got;
method->update(buffer, got);
}
} else {
logger_->warn("Unable to open: %s: %s", path.c_str(),
strerror(errno));
}
runner_->post(std::bind(callback, result, size));
}
std::shared_ptr<Logger> logger_;
std::shared_ptr<TaskRunner> runner_;
std::unique_ptr<TaskRunner> workers_;
};
} // namespace
std::unique_ptr<Hasher> Hasher::create(std::shared_ptr<Logger> logger,
std::shared_ptr<TaskRunner> runner,
size_t threads) {
return std::make_unique<HasherImpl>(std::move(logger), std::move(runner),
threads);
}
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