lokinet/llarp/ev.cpp

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#include <llarp/ev.h>
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#include <llarp/logic.h>
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#include <llarp/string_view.hpp>
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#include "mem.hpp"
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#define EV_TICK_INTERVAL 100
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// apparently current Solaris will emulate epoll.
#if __linux__ || __sun__
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#include "ev_epoll.hpp"
#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
|| (__APPLE__ && __MACH__)
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#include "ev_kqueue.hpp"
#elif defined(_WIN32) || defined(_WIN64) || defined(__NT__)
#include "ev_win32.hpp"
#else
#error No async event loop for your platform, subclass llarp_ev_loop
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#endif
void
llarp_ev_loop_alloc(struct llarp_ev_loop **ev)
{
#if __linux__ || __sun__
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*ev = new llarp_epoll_loop;
#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
|| (__APPLE__ && __MACH__)
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*ev = new llarp_kqueue_loop;
#elif defined(_WIN32) || defined(_WIN64) || defined(__NT__)
*ev = new llarp_win32_loop;
#else
#error no event loop subclass
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#endif
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(*ev)->init();
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(*ev)->_now = llarp_time_now_ms();
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}
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void
llarp_ev_loop_free(struct llarp_ev_loop **ev)
{
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delete *ev;
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*ev = nullptr;
}
int
llarp_ev_loop_run(struct llarp_ev_loop *ev, struct llarp_logic *logic)
{
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while(ev->running())
{
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ev->_now = llarp_time_now_ms();
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ev->tick(EV_TICK_INTERVAL);
if(ev->running())
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llarp_logic_tick(logic, ev->_now);
}
return 0;
}
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void
llarp_ev_loop_run_single_process(struct llarp_ev_loop *ev,
struct llarp_threadpool *tp,
struct llarp_logic *logic)
{
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while(ev->running())
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{
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ev->_now = llarp_time_now_ms();
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ev->tick(EV_TICK_INTERVAL);
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if(ev->running())
{
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llarp_logic_tick_async(logic, ev->_now);
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llarp_threadpool_tick(tp);
}
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}
}
int
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llarp_ev_add_udp(struct llarp_ev_loop *ev, struct llarp_udp_io *udp,
const struct sockaddr *src)
{
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udp->parent = ev;
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if(ev->udp_listen(udp, src))
return 0;
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return -1;
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}
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int
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llarp_ev_close_udp(struct llarp_udp_io *udp)
{
if(udp->parent->udp_close(udp))
return 0;
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return -1;
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}
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llarp_time_t
llarp_ev_loop_time_now_ms(struct llarp_ev_loop *loop)
{
return loop->_now;
}
void
llarp_ev_loop_stop(struct llarp_ev_loop *loop)
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{
loop->stop();
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}
int
llarp_ev_udp_sendto(struct llarp_udp_io *udp, const sockaddr *to,
const void *buf, size_t sz)
{
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auto ret = static_cast< llarp::ev_io * >(udp->impl)->sendto(to, buf, sz);
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if(ret == -1 && errno != 0)
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{
llarp::LogWarn("sendto failed ", strerror(errno));
errno = 0;
}
return ret;
}
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bool
llarp_ev_add_tun(struct llarp_ev_loop *loop, struct llarp_tun_io *tun)
{
auto dev = loop->create_tun(tun);
tun->impl = dev;
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if(dev)
{
return loop->add_ev(dev, false);
}
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return false;
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}
bool
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llarp_tcp_conn_async_write(struct llarp_tcp_conn *conn, const void *pkt,
size_t sz)
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{
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const byte_t *ptr = (const byte_t *)pkt;
llarp::tcp_conn *impl = static_cast< llarp::tcp_conn * >(conn->impl);
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if(impl->_shouldClose)
{
llarp::LogError("write on closed connection");
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return false;
}
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while(sz > EV_WRITE_BUF_SZ)
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{
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if(!impl->queue_write((const byte_t *)ptr, EV_WRITE_BUF_SZ))
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return false;
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ptr += EV_WRITE_BUF_SZ;
sz -= EV_WRITE_BUF_SZ;
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}
return impl->queue_write(ptr, sz);
}
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void
llarp_tcp_async_try_connect(struct llarp_ev_loop *loop,
struct llarp_tcp_connecter *tcp)
{
tcp->loop = loop;
llarp::string_view addr_str, port_str;
// try parsing address
const char *begin = tcp->remote;
const char *ptr = strstr(tcp->remote, ":");
// get end of address
if(ptr == nullptr)
{
llarp::LogError("bad address: ", tcp->remote);
if(tcp->error)
tcp->error(tcp);
return;
}
const char *end = ptr;
while(*end && (end - begin) < sizeof(tcp->remote))
{
++end;
}
addr_str = llarp::string_view(begin, ptr - begin);
++ptr;
port_str = llarp::string_view(ptr, end - ptr);
// actually parse address
llarp::Addr addr(addr_str, port_str);
if(!loop->tcp_connect(tcp, addr))
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{
llarp::LogError("async connect failed");
if(tcp->error)
tcp->error(tcp);
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}
}
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bool
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llarp_tcp_serve(struct llarp_ev_loop *loop, struct llarp_tcp_acceptor *tcp,
const struct sockaddr *bindaddr)
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{
tcp->loop = loop;
llarp::ev_io *impl = loop->bind_tcp(tcp, bindaddr);
if(impl)
{
return loop->add_ev(impl, false);
}
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return false;
}
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void
llarp_tcp_acceptor_close(struct llarp_tcp_acceptor *tcp)
{
llarp::ev_io *impl = static_cast< llarp::ev_io * >(tcp->user);
tcp->impl = nullptr;
tcp->loop->close_ev(impl);
if(tcp->closed)
tcp->closed(tcp);
// dont free acceptor because it may be stack allocated
}
bool
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llarp_ev_tun_async_write(struct llarp_tun_io *tun, const void *buf, size_t sz)
{
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if(sz > EV_WRITE_BUF_SZ)
{
llarp::LogWarn("packet too big, ", sz, " > ", EV_WRITE_BUF_SZ);
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return false;
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}
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return static_cast< llarp::tun * >(tun->impl)->queue_write(
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(const byte_t *)buf, sz);
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}
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void
llarp_tcp_conn_close(struct llarp_tcp_conn *conn)
{
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static_cast< llarp::tcp_conn * >(conn->impl)->_shouldClose = true;
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}
namespace llarp
{
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bool
tcp_conn::tick()
{
if(_shouldClose)
{
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if(tcp.closed)
tcp.closed(&tcp);
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return false;
}
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else if(tcp.tick)
tcp.tick(&tcp);
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return true;
}
} // namespace llarp