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#include <cybozu/logger.hpp>
#include <cybozu/reactor.hpp>
#include <cybozu/tcp.hpp>
#include <cybozu/util.hpp>
#include <algorithm>
#include <cerrno>
#include <cstddef>
#include <fcntl.h>
#include <functional>
#include <iostream>
#include <memory>
#include <sys/stat.h>
#include <sys/types.h>
#include <thread>
#include <unistd.h>
#include <utility>
#include <vector>
//const std::size_t CHUNK_SIZE = (2 << 20); // 2 MiB
const std::size_t CHUNK_SIZE = (512 << 10); // 512 KiB
class filesend_socket: public cybozu::tcp_socket {
public:
filesend_socket(int fd): cybozu::tcp_socket(fd, 2) {}
private:
virtual bool on_readable() override final { return true; }
};
void filesend(const char* path, cybozu::tcp_socket& s) {
int fd = open(path, O_RDONLY);
if( fd == -1 ) return;
struct stat st;
if( fstat(fd, &st) == -1 ) {
std::cerr << "fstat failed." << std::endl;
close(fd);
cybozu::throw_unix_error(errno, "fstat");
}
off_t length = st.st_size;
std::cout << "sending " << length << " bytes." << std::endl;
std::vector<char> buffer(CHUNK_SIZE);
char* const p_buf = buffer.data();
while( length ) {
off_t to_read = std::min(length, (off_t)CHUNK_SIZE);
ssize_t n = read(fd, p_buf, to_read);
if( n == -1 ) {
std::cerr << "read failed." << std::endl;
close(fd);
cybozu::throw_unix_error(errno, "read");
}
length -= n;
if( length == 0 ) {
std::cerr << "closing." << std::endl;
s.send_close(p_buf, n);
} else {
s.send(p_buf, n);
}
}
close(fd);
}
int main(int argc, char** argv) {
if( argc != 3 ) {
std::cout << "Usage: filesend.exe FILENAME THREADS" << std::endl;
return 0;
}
cybozu::logger::set_threshold(cybozu::severity::debug);
const char* path = argv[1];
int n_threads = std::stoi(argv[2]);
if( n_threads < 0 ) {
std::cout << "Invalid number of threads." << std::endl;
return 1;
}
cybozu::reactor r;
std::vector<std::thread> threads;
for( int i = 0; i < n_threads; ++i ) {
int c = cybozu::tcp_connect(NULL, 11111);
if( c == -1 ) {
std::cerr << "failed to connect to localhost:11111" << std::endl;
return 2;
}
std::unique_ptr<filesend_socket> s( new filesend_socket(c) );
threads.emplace_back(filesend, path, std::ref(*s));
r.add_resource( std::move(s), cybozu::reactor::EVENT_OUT );
}
r.run([&threads](cybozu::reactor& r) {
r.fix_garbage();
r.gc();
if( r.size() == 0 ) {
for( auto& t: threads )
t.join();
r.quit();
}
});
return 0;
}
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