/* 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.

 */

#include "uv.h"

#include "task.h"

#include <stdlib.h>

#include <string.h>

static char exepath[1024];

static size_t exepath_size = 1024;

static char* args[3];

static uv_process_options_t options;

static int close_cb_called;

static int exit_cb_called;

static int on_read_cb_called;

static int after_write_cb_called;

static uv_pipe_t in;

static uv_pipe_t out;

static uv_loop_t* loop;

#define OUTPUT_SIZE 1024

static char output[OUTPUT_SIZE];

static int output_used;

static void close_cb(uv_handle_t* handle) {

  close_cb_called++;

}

static void exit_cb(uv_process_t* process,

                    int64_t exit_status,

                    int term_signal) {

  printf("exit_cb\n");

  exit_cb_called++;

  ASSERT(exit_status == 0);

  ASSERT(term_signal == 0);

  uv_close((uv_handle_t*)process, close_cb);

  uv_close((uv_handle_t*)&in, close_cb);

  uv_close((uv_handle_t*)&out, close_cb);

}

static void init_process_options(char* test, uv_exit_cb exit_cb) {

  int r = uv_exepath(exepath, &exepath_size);

  ASSERT(r == 0);

  exepath[exepath_size] = '\0';

  args[0] = exepath;

  args[1] = test;

  args[2] = NULL;

  options.file = exepath;

  options.args = args;

  options.exit_cb = exit_cb;

}

static void on_alloc(uv_handle_t* handle,

                     size_t suggested_size,

                     uv_buf_t* buf) {

  buf->base = output + output_used;

  buf->len = OUTPUT_SIZE - output_used;

}

static void after_write(uv_write_t* req, int status) {

  if (status) {

    fprintf(stderr, "uv_write error: %s\n", uv_strerror(status));

    ASSERT(0);

  }

  /* Free the read/write buffer and the request */

  free(req);

  after_write_cb_called++;

}

static void on_read(uv_stream_t* pipe, ssize_t nread, const uv_buf_t* rdbuf) {

  uv_write_t* req;

  uv_buf_t wrbuf;

  int r;

  ASSERT(nread > 0 || nread == UV_EOF);

  if (nread > 0) {

    output_used += nread;

    if (output_used % 12 == 0) {

      ASSERT(memcmp("hello world\n", output, 12) == 0);

      wrbuf = uv_buf_init(output, 12);

      req = malloc(sizeof(*req));

      r = uv_write(req, (uv_stream_t*) &in, &wrbuf, 1, after_write);

      ASSERT(r == 0);

    }

  }

  on_read_cb_called++;

}

static void test_stdio_over_pipes(int overlapped) {

  int r;

  uv_process_t process;

  uv_stdio_container_t stdio[3];

  loop = uv_default_loop();

  init_process_options("stdio_over_pipes_helper", exit_cb);

  uv_pipe_init(loop, &out, 0);

  uv_pipe_init(loop, &in, 0);

  options.stdio = stdio;

  options.stdio[0].flags = UV_CREATE_PIPE | UV_READABLE_PIPE |

      (overlapped ?  UV_OVERLAPPED_PIPE : 0);

  options.stdio[0].data.stream = (uv_stream_t*) ∈

  options.stdio[1].flags = UV_CREATE_PIPE | UV_WRITABLE_PIPE |

      (overlapped ? UV_OVERLAPPED_PIPE : 0);

  options.stdio[1].data.stream = (uv_stream_t*) &out;

  options.stdio[2].flags = UV_INHERIT_FD;

  options.stdio[2].data.fd = 2;

  options.stdio_count = 3;

  r = uv_spawn(loop, &process, &options);

  ASSERT(r == 0);

  r = uv_read_start((uv_stream_t*) &out, on_alloc, on_read);

  ASSERT(r == 0);

  r = uv_run(uv_default_loop(), UV_RUN_DEFAULT);

  ASSERT(r == 0);

  ASSERT(on_read_cb_called > 1);

  ASSERT(after_write_cb_called == 2);

  ASSERT(exit_cb_called == 1);

  ASSERT(close_cb_called == 3);

  ASSERT(memcmp("hello world\nhello world\n", output, 24) == 0);

  ASSERT(output_used == 24);

  MAKE_VALGRIND_HAPPY();

}

TEST_IMPL(stdio_over_pipes) {

  test_stdio_over_pipes(0);

  return 0;

}

TEST_IMPL(stdio_emulate_iocp) {

  test_stdio_over_pipes(1);

  return 0;

}

/* Everything here runs in a child process. */

static int on_pipe_read_called;

static int after_write_called;

static uv_pipe_t stdin_pipe1;

static uv_pipe_t stdout_pipe1;

static uv_pipe_t stdin_pipe2;

static uv_pipe_t stdout_pipe2;

static void on_pipe_read(uv_stream_t* pipe, ssize_t nread, const uv_buf_t* buf) {

  ASSERT(nread > 0);

  ASSERT(memcmp("hello world\n", buf->base, nread) == 0);

  on_pipe_read_called++;

  free(buf->base);

  uv_read_stop(pipe);

}

static void after_pipe_write(uv_write_t* req, int status) {

  ASSERT(status == 0);

  after_write_called++;

}

static void on_read_alloc(uv_handle_t* handle,

                          size_t suggested_size,

                          uv_buf_t* buf) {

  buf->base = malloc(suggested_size);

  buf->len = suggested_size;

}

int stdio_over_pipes_helper(void) {

  /* Write several buffers to test that the write order is preserved. */

  char* buffers[] = {

    "he",

    "ll",

    "o ",

    "wo",

    "rl",

    "d",

    "\n"

  };

  uv_write_t write_req[ARRAY_SIZE(buffers)];

  uv_buf_t buf[ARRAY_SIZE(buffers)];

  unsigned int i;

  int j;

  int r;

  uv_loop_t* loop = uv_default_loop();

  ASSERT(UV_NAMED_PIPE == uv_guess_handle(0));

  ASSERT(UV_NAMED_PIPE == uv_guess_handle(1));

  r = uv_pipe_init(loop, &stdin_pipe1, 0);

  ASSERT(r == 0);

  r = uv_pipe_init(loop, &stdout_pipe1, 0);

  ASSERT(r == 0);

  r = uv_pipe_init(loop, &stdin_pipe2, 0);

  ASSERT(r == 0);

  r = uv_pipe_init(loop, &stdout_pipe2, 0);

  ASSERT(r == 0);

  uv_pipe_open(&stdin_pipe1, 0);

  uv_pipe_open(&stdout_pipe1, 1);

  uv_pipe_open(&stdin_pipe2, 0);

  uv_pipe_open(&stdout_pipe2, 1);

  for (j = 0; j < 2; j++) {

    /* Unref both stdio handles to make sure that all writes complete. */

    uv_unref((uv_handle_t*) &stdin_pipe1);

    uv_unref((uv_handle_t*) &stdout_pipe1);

    uv_unref((uv_handle_t*) &stdin_pipe2);

    uv_unref((uv_handle_t*) &stdout_pipe2);

    for (i = 0; i < ARRAY_SIZE(buffers); i++) {

      buf[i] = uv_buf_init((char*) buffers[i], strlen(buffers[i]));

    }

    for (i = 0; i < ARRAY_SIZE(buffers); i++) {

      r = uv_write(&write_req[i],

                   (uv_stream_t*) (j == 0 ? &stdout_pipe1 : &stdout_pipe2),

                   &buf[i],

                   1,

                   after_pipe_write);

      ASSERT(r == 0);

    }

    notify_parent_process();

    uv_run(loop, UV_RUN_DEFAULT);

    ASSERT(after_write_called == 7 * (j + 1));

    ASSERT(on_pipe_read_called == j);

    ASSERT(close_cb_called == 0);

    uv_ref((uv_handle_t*) &stdout_pipe1);

    uv_ref((uv_handle_t*) &stdin_pipe1);

    uv_ref((uv_handle_t*) &stdout_pipe2);

    uv_ref((uv_handle_t*) &stdin_pipe2);

    r = uv_read_start((uv_stream_t*) (j == 0 ? &stdin_pipe1 : &stdin_pipe2),

                      on_read_alloc,

                      on_pipe_read);

    ASSERT(r == 0);

    uv_run(loop, UV_RUN_DEFAULT);

    ASSERT(after_write_called == 7 * (j + 1));

    ASSERT(on_pipe_read_called == j + 1);

    ASSERT(close_cb_called == 0);

  }

  uv_close((uv_handle_t*)&stdin_pipe1, close_cb);

  uv_close((uv_handle_t*)&stdout_pipe1, close_cb);

  uv_close((uv_handle_t*)&stdin_pipe2, close_cb);

  uv_close((uv_handle_t*)&stdout_pipe2, close_cb);

  uv_run(loop, UV_RUN_DEFAULT);

  ASSERT(after_write_called == 14);

  ASSERT(on_pipe_read_called == 2);

  ASSERT(close_cb_called == 4);

  MAKE_VALGRIND_HAPPY();

  return 0;

}