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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
/*
* TODO: Add explanation of why we want on_close to be called from fresh
* stack.
*/
#include "uv.h"
#include "task.h"
static const char MESSAGE[] = "Failure is for the weak. Everyone dies alone.";
static uv_tcp_t client;
static uv_timer_t timer;
static uv_connect_t connect_req;
static uv_write_t write_req;
static uv_shutdown_t shutdown_req;
static int nested = 0;
static int close_cb_called = 0;
static int connect_cb_called = 0;
static int write_cb_called = 0;
static int timer_cb_called = 0;
static int bytes_received = 0;
static int shutdown_cb_called = 0;
static uv_buf_t alloc_cb(uv_handle_t* handle, size_t size) {
uv_buf_t buf;
buf.len = size;
buf.base = (char*) malloc(size);
ASSERT(buf.base);
return buf;
}
static void close_cb(uv_handle_t* handle) {
ASSERT(nested == 0 && "close_cb must be called from a fresh stack");
close_cb_called++;
}
static void shutdown_cb(uv_shutdown_t* req, int status) {
ASSERT(status == 0);
ASSERT(nested == 0 && "shutdown_cb must be called from a fresh stack");
shutdown_cb_called++;
}
static void read_cb(uv_stream_t* tcp, ssize_t nread, uv_buf_t buf) {
ASSERT(nested == 0 && "read_cb must be called from a fresh stack");
printf("Read. nread == %d\n", (int)nread);
free(buf.base);
if (nread == 0) {
ASSERT(uv_last_error(uv_default_loop()).code == UV_EAGAIN);
return;
} else if (nread == -1) {
ASSERT(uv_last_error(uv_default_loop()).code == UV_EOF);
nested++;
uv_close((uv_handle_t*)tcp, close_cb);
nested--;
return;
}
bytes_received += nread;
/* We call shutdown here because when bytes_received == sizeof MESSAGE */
/* there will be no more data sent nor received, so here it would be */
/* possible for a backend to to call shutdown_cb immediately and *not* */
/* from a fresh stack. */
if (bytes_received == sizeof MESSAGE) {
nested++;
puts("Shutdown");
if (uv_shutdown(&shutdown_req, (uv_stream_t*)tcp, shutdown_cb)) {
FATAL("uv_shutdown failed");
}
nested--;
}
}
static void timer_cb(uv_timer_t* handle, int status) {
ASSERT(handle == &timer);
ASSERT(status == 0);
ASSERT(nested == 0 && "timer_cb must be called from a fresh stack");
puts("Timeout complete. Now read data...");
nested++;
if (uv_read_start((uv_stream_t*)&client, alloc_cb, read_cb)) {
FATAL("uv_read_start failed");
}
nested--;
timer_cb_called++;
uv_close((uv_handle_t*)handle, close_cb);
}
static void write_cb(uv_write_t* req, int status) {
int r;
ASSERT(status == 0);
ASSERT(nested == 0 && "write_cb must be called from a fresh stack");
puts("Data written. 500ms timeout...");
/* After the data has been sent, we're going to wait for a while, then */
/* start reading. This makes us certain that the message has been echoed */
/* back to our receive buffer when we start reading. This maximizes the */
/* tempation for the backend to use dirty stack for calling read_cb. */
nested++;
r = uv_timer_init(uv_default_loop(), &timer);
ASSERT(r == 0);
r = uv_timer_start(&timer, timer_cb, 500, 0);
ASSERT(r == 0);
nested--;
write_cb_called++;
}
static void connect_cb(uv_connect_t* req, int status) {
uv_buf_t buf;
puts("Connected. Write some data to echo server...");
ASSERT(status == 0);
ASSERT(nested == 0 && "connect_cb must be called from a fresh stack");
nested++;
buf.base = (char*) &MESSAGE;
buf.len = sizeof MESSAGE;
if (uv_write(&write_req, (uv_stream_t*)req->handle, &buf, 1, write_cb)) {
FATAL("uv_write failed");
}
nested--;
connect_cb_called++;
}
TEST_IMPL(callback_stack) {
struct sockaddr_in addr = uv_ip4_addr("127.0.0.1", TEST_PORT);
uv_init();
if (uv_tcp_init(uv_default_loop(), &client)) {
FATAL("uv_tcp_init failed");
}
puts("Connecting...");
nested++;
if (uv_tcp_connect(&connect_req, &client, addr, connect_cb)) {
FATAL("uv_tcp_connect failed");
}
nested--;
uv_run(uv_default_loop());
ASSERT(nested == 0);
ASSERT(connect_cb_called == 1 && "connect_cb must be called exactly once");
ASSERT(write_cb_called == 1 && "write_cb must be called exactly once");
ASSERT(timer_cb_called == 1 && "timer_cb must be called exactly once");
ASSERT(bytes_received == sizeof MESSAGE);
ASSERT(shutdown_cb_called == 1 && "shutdown_cb must be called exactly once");
ASSERT(close_cb_called == 2 && "close_cb must be called exactly twice");
return 0;
}
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