115 lines
3.2 KiB
C
115 lines
3.2 KiB
C
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <uv.h>
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uv_loop_t *loop;
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struct child_worker {
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uv_process_t req;
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uv_process_options_t options;
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uv_pipe_t pipe;
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} *workers;
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int round_robin_counter;
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int child_worker_count;
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uv_buf_t dummy_buf;
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char worker_path[500];
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void close_process_handle(uv_process_t *req, int64_t exit_status, int term_signal) {
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fprintf(stderr, "Process exited with status %" PRId64 ", signal %d\n", exit_status, term_signal);
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uv_close((uv_handle_t*) req, NULL);
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}
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void alloc_buffer(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf) {
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buf->base = malloc(suggested_size);
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buf->len = suggested_size;
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}
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void on_new_connection(uv_stream_t *server, int status) {
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if (status == -1) {
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// error!
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return;
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}
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uv_tcp_t *client = (uv_tcp_t*) malloc(sizeof(uv_tcp_t));
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uv_tcp_init(loop, client);
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if (uv_accept(server, (uv_stream_t*) client) == 0) {
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uv_write_t *write_req = (uv_write_t*) malloc(sizeof(uv_write_t));
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dummy_buf = uv_buf_init("a", 1);
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struct child_worker *worker = &workers[round_robin_counter];
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uv_write2(write_req, (uv_stream_t*) &worker->pipe, &dummy_buf, 1, (uv_stream_t*) client, NULL);
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round_robin_counter = (round_robin_counter + 1) % child_worker_count;
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}
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else {
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uv_close((uv_handle_t*) client, NULL);
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}
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}
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void setup_workers() {
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size_t path_size = 500;
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uv_exepath(worker_path, &path_size);
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strcpy(worker_path + (strlen(worker_path) - strlen("multi-echo-server")), "worker");
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fprintf(stderr, "Worker path: %s\n", worker_path);
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char* args[2];
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args[0] = worker_path;
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args[1] = NULL;
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round_robin_counter = 0;
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// ...
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// launch same number of workers as number of CPUs
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uv_cpu_info_t *info;
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int cpu_count;
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uv_cpu_info(&info, &cpu_count);
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uv_free_cpu_info(info, cpu_count);
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child_worker_count = cpu_count;
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workers = calloc(cpu_count, sizeof(struct child_worker));
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while (cpu_count--) {
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struct child_worker *worker = &workers[cpu_count];
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uv_pipe_init(loop, &worker->pipe, 1);
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uv_stdio_container_t child_stdio[3];
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child_stdio[0].flags = UV_CREATE_PIPE | UV_READABLE_PIPE;
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child_stdio[0].data.stream = (uv_stream_t*) &worker->pipe;
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child_stdio[1].flags = UV_IGNORE;
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child_stdio[2].flags = UV_INHERIT_FD;
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child_stdio[2].data.fd = 2;
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worker->options.stdio = child_stdio;
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worker->options.stdio_count = 3;
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worker->options.exit_cb = close_process_handle;
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worker->options.file = args[0];
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worker->options.args = args;
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uv_spawn(loop, &worker->req, &worker->options);
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fprintf(stderr, "Started worker %d\n", worker->req.pid);
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}
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}
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int main() {
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loop = uv_default_loop();
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setup_workers();
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uv_tcp_t server;
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uv_tcp_init(loop, &server);
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struct sockaddr_in bind_addr;
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uv_ip4_addr("0.0.0.0", 7000, &bind_addr);
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uv_tcp_bind(&server, (const struct sockaddr *)&bind_addr, 0);
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int r;
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if ((r = uv_listen((uv_stream_t*) &server, 128, on_new_connection))) {
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fprintf(stderr, "Listen error %s\n", uv_err_name(r));
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return 2;
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}
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return uv_run(loop, UV_RUN_DEFAULT);
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}
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