/* 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 void alloc_cb(uv_handle_t* handle, size_t size, uv_buf_t* buf) { buf->len = size; buf->base = malloc(size); ASSERT_NOT_NULL(buf->base); } 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, const 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) { return; } else if (nread < 0) { ASSERT(nread == 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 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) { ASSERT(handle == &timer); 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 temptation * 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; ASSERT(0 == uv_ip4_addr("127.0.0.1", TEST_PORT, &addr)); if (uv_tcp_init(uv_default_loop(), &client)) { FATAL("uv_tcp_init failed"); } puts("Connecting..."); nested++; if (uv_tcp_connect(&connect_req, &client, (const struct sockaddr*) &addr, connect_cb)) { FATAL("uv_tcp_connect failed"); } nested--; uv_run(uv_default_loop(), UV_RUN_DEFAULT); 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"); MAKE_VALGRIND_HAPPY(uv_default_loop()); return 0; }