91 lines
2.9 KiB
C++
91 lines
2.9 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "callbacks.h" // NOLINT(build/include)
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#include <iostream>
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size_t g_iterations = 0;
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size_t constexpr kMaxIterations = 1'000'000;
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static char g_buffer[1024];
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static uv_buf_t g_iov;
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// Stop the handle if the methods was called kMaxIterations times
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void IdleCallback(uv_idle_t* handle) {
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++g_iterations;
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if (g_iterations > kMaxIterations) {
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std::cout << "IdleCallback was called " << kMaxIterations << " times"
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<< std::endl;
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uv_idle_stop(handle);
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}
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}
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// Called after some chars have been written
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// As soon as writing of these bytes is completed, read more
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void OnWrite(uv_fs_t* req) {
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if (req->result < 0) {
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std::cerr << "Write error: " << uv_strerror(static_cast<int>(req->result))
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<< std::endl;
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return;
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}
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// Start reading more after writing these bytes
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uv_fs_read(uv_default_loop(), &read_req, open_req.result, &g_iov, 1, -1,
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OnRead);
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}
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// Called after some chars have been read
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// As soon as reading of these bytes is completed, write them
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void OnRead(uv_fs_t* req) {
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if (req->result < 0) {
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std::cerr << "Read error: " << uv_strerror(req->result) << std::endl;
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return;
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}
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if (req->result == 0) {
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// No more bytes left, close the loop
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uv_fs_t close_req;
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uv_fs_close(uv_default_loop(), &close_req, open_req.result, NULL);
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} else if (req->result > 0) {
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// Start writing after reading some bytes
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g_iov.len = req->result;
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uv_fs_write(uv_default_loop(), &write_req, 1, &g_iov, 1, -1, OnWrite);
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}
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}
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// Called after the file has been opened
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// As soon as opening is completed, read the file
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void OnOpen(uv_fs_t* req) {
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if (req != &open_req) {
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std::cerr << "Open error: req != &open_req" << std::endl;
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return;
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}
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if (req->result < 0) {
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std::cerr << "Open error: " << uv_strerror(static_cast<int>(req->result))
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<< std::endl;
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return;
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}
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// Initialize uv_buf_t g_buffer
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g_iov = uv_buf_init(g_buffer, sizeof(g_buffer));
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// Start reading after opening
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uv_fs_read(uv_default_loop(), &read_req, req->result, &g_iov, 1, -1, OnRead);
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}
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// Get the integer pointed by handle->data and increment it by one
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// Then close the handle
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void TimerCallback(uv_timer_t* handle) {
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int* data = static_cast<int*>(
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uv_handle_get_data(reinterpret_cast<uv_handle_t*>(handle)));
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++(*data);
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uv_close(reinterpret_cast<uv_handle_t*>(handle), nullptr);
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}
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