static void
ev_io_on_write(struct ev_loop* mainloop, ev_io* watcher, const int events)
{
/* Since the response writing code is fairly complex, I'll try to give a short
* overview of the different control flow paths etc.:
*
* On the very top level, there are two types of responses to distinguish:
* A) sendfile responses
* B) iterator/other responses
*
* These cases are handled by the 'on_write_sendfile' and 'on_write_chunk'
* routines, respectively. They use the 'do_sendfile' and 'do_send_chunk'
* routines to do the actual write()-ing. The 'do_*' routines return true if
* there's some data left to send in the current chunk (or, in the case of
* sendfile, the end of the file has not been reached yet).
*
* When the 'do_*' routines return false, the 'on_write_*' routines have to
* figure out if there's a next chunk to send (e.g. in the case of a response iterator).
*/
Request* request = REQUEST_FROM_WATCHER(watcher);
GIL_LOCK(0);
write_state write_state;
if(request->state.use_sendfile) {
write_state = on_write_sendfile(mainloop, request);
} else {
write_state = on_write_chunk(mainloop, request);
}
switch(write_state) {
case not_yet_done:
break;
case done:
if(request->state.keep_alive) {
DBG_REQ(request, "done, keep-alive");
ev_io_stop(mainloop, &request->ev_watcher);
Request_clean(request);
Request_reset(request);
ev_io_init(&request->ev_watcher, &ev_io_on_read,
request->client_fd, EV_READ);
ev_io_start(mainloop, &request->ev_watcher);
} else {
DBG_REQ(request, "done, close");
close_connection(mainloop, request);
}
break;
case aborted:
/* Response was aborted due to an error. We can't do anything graceful here
* because at least one chunk is already sent... just close the connection. */
close_connection(mainloop, request);
break;
}
GIL_UNLOCK(0);
}
static bool
handle_nonzero_errno(Request* request)
{
if(errno == EAGAIN || errno == M_EWOULDBLOCK) { //WSAEWOULDBLOCK
/* Try again later */
return true;
} else {
/* Serious transmission failure. Hang up. */
fprintf(stderr, "Client %d hit errno %d\n", request->client_fd, errno);
Py_XDECREF(request->current_chunk);
Py_XCLEAR(request->iterator);
request->state.keep_alive = false;
Request_clean(request);
Request_reset(request);
return false;
}
}
void Request_free(Request* request)
{
Request_clean(request);
Py_DECREF(request->client_addr);
free(request);
}
/* XXX too many gotos */
static void
ev_io_on_write(struct ev_loop* mainloop, ev_io* watcher, const int events)
{
Request* request = REQUEST_FROM_WATCHER(watcher);
GIL_LOCK(0);
if(request->state.use_sendfile) {
/* sendfile */
if(request->current_chunk) {
/* current_chunk contains the HTTP headers */
if(send_chunk(request))
goto out;
assert(!request->current_chunk_p);
/* abuse current_chunk_p to store the file fd */
request->current_chunk_p = PyObject_AsFileDescriptor(request->iterable);
goto out;
}
if(do_sendfile(request))
goto out;
} else {
/* iterable */
if(send_chunk(request))
goto out;
if(request->iterator) {
PyObject* next_chunk;
next_chunk = wsgi_iterable_get_next_chunk(request);
if(next_chunk) {
if(request->state.chunked_response) {
request->current_chunk = wrap_http_chunk_cruft_around(next_chunk);
Py_DECREF(next_chunk);
} else {
request->current_chunk = next_chunk;
}
assert(request->current_chunk_p == 0);
goto out;
} else {
if(PyErr_Occurred()) {
PyErr_Print();
/* We can't do anything graceful here because at least one
* chunk is already sent... just close the connection */
DBG_REQ(request, "Exception in iterator, can not recover");
ev_io_stop(mainloop, &request->ev_watcher);
close(request->client_fd);
Request_free(request);
goto out;
}
Py_CLEAR(request->iterator);
}
}
if(request->state.chunked_response) {
/* We have to send a terminating empty chunk + \r\n */
request->current_chunk = PyString_FromString("0\r\n\r\n");
assert(request->current_chunk_p == 0);
request->state.chunked_response = false;
goto out;
}
}
ev_io_stop(mainloop, &request->ev_watcher);
if(request->state.keep_alive) {
DBG_REQ(request, "done, keep-alive");
Request_clean(request);
Request_reset(request);
ev_io_init(&request->ev_watcher, &ev_io_on_read,
request->client_fd, EV_READ);
ev_io_start(mainloop, &request->ev_watcher);
} else {
DBG_REQ(request, "done, close");
close(request->client_fd);
Request_free(request);
}
out:
GIL_UNLOCK(0);
}
static void io_write(Request* request)
{
//GIL_LOCK(0);
if(request->state.use_sendfile) {
dprint("发送文件给客户端");
/* sendfile */
if(request->current_chunk && send_chunk(request))
goto out;
/* abuse current_chunk_p to store the file fd */
request->current_chunk_p = PyObject_AsFileDescriptor(request->iterable);
if(do_sendfile(request))
goto out;
} else {
dprint("发送字符");
/* iterable */
if(send_chunk(request)){
dprint("一次发送即完成");
//uv_close((uv_handle_t*) &request->ev_watcher, _http_uv__on_close__cb);
goto out;
}
if(request->iterator) {
PyObject* next_chunk;
dprint("request迭代");
next_chunk = wsgi_iterable_get_next_chunk(request);
if(next_chunk) {
dprint("下一块chunk发送");
if(request->state.chunked_response) {
request->current_chunk = wrap_http_chunk_cruft_around(next_chunk);
Py_DECREF(next_chunk);
} else {
request->current_chunk = next_chunk;
}
assert(request->current_chunk_p == 0);
//io_write(request);
goto out;
} else {
if(PyErr_Occurred()) {
uv_err_t err;
dprint("迭代出错");
PyErr_Print();
DBG_REQ(request, "Exception in iterator, can not recover");
uv_close((uv_handle_t*) request->ev_watcher, on_close);
Request_free(request);
err = uv_last_error(loop);
UVERR(err, "uv_write error on next chunk");
ASSERT(0);
goto out;
}
dprint("没有下一块chunk");
Py_CLEAR(request->iterator);
}
}
if(request->state.chunked_response) {
dprint("如果是chunked_response 发送收尾数据,并置空chunked_response");
/* We have to send a terminating empty chunk + \r\n */
request->current_chunk = PyString_FromString("0\r\n\r\n");
assert(request->current_chunk_p == 0);
//io_write(request);
request->state.chunked_response = false;
goto out;
}
}
dprint("响应完成");
if(request->state.keep_alive) {
DBG_REQ(request, "done, keep-alive");
Request_clean(request);
Request_reset(request);
} else {
dprint("done not keep alive");
uv_close((uv_handle_t*) request->ev_watcher, on_close);
Request_free(request);
}
out:
dprint("本次字符发送结束");
//GIL_UNLOCK(0);
return;
}