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wxlistener.c
284 lines (233 loc) · 7.53 KB
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wxlistener.c
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#include <ev.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <stdint.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/shm.h>
#define __USE_GNU
#include <sched.h>
#define err(fmt,...) fprintf(stderr, "[pid:%d, line: %3d] "fmt" %s\n", getpid(), __LINE__, ##__VA_ARGS__, strerror(errno))
#ifndef container_of
# define container_of(ptr, type, field) ((type*)((char*)(ptr) - ((char*)&((type*)0)->field)))
#endif
struct worker_s {
struct ev_child cwatcher;
int worker_id;
int listen_fd;
pid_t pid;
struct listener_s* listener;
int starttime;
};
struct listener_s {
int argc;
char** argv;
int stop_moniter;
int worker_count;
struct worker_s* workers;
int shm_id;
int shm_size;
};
int start_listen(char* ip, uint16_t port) {
int listenfd = socket(PF_INET, SOCK_STREAM, 0);
if (listenfd<0) {
return -1;
}
struct sockaddr_in srvaddr;
memset(&srvaddr, 0, sizeof(struct sockaddr_in));
srvaddr.sin_family = PF_INET;
srvaddr.sin_addr.s_addr = inet_addr(ip);
srvaddr.sin_port = htons(port);
int one = 1;
#ifdef SO_REUSEPORT
setsockopt(listenfd, SOL_SOCKET, SO_REUSEPORT, &one, sizeof(one));
#endif
setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
fcntl(listenfd, F_SETFL, fcntl(listenfd, F_GETFL) | O_NONBLOCK);
if (bind(listenfd, (struct sockaddr*)&srvaddr, sizeof(struct sockaddr)) < 0) {
err("bind");
return -1;
}
if (listen(listenfd, 511) < 0) {
err("listen");
return -1;
}
return listenfd;
}
pid_t spawn_worker(struct worker_s* worker) {
struct timeval tv;
gettimeofday(&tv, 0);
worker->starttime = (int)tv.tv_sec;
struct listener_s* listener = worker->listener;
pid_t pid = fork();
if (pid < 0) {
err("fork");
return -1;
} else if (pid == 0) { // child
cpu_set_t mask;
CPU_ZERO(&mask);
CPU_SET(worker->worker_id, &mask);
sched_setaffinity(getpid(), sizeof(mask), &mask);
struct worker_s* wks= listener->workers;
int wkid = worker->worker_id;
while (wkid--) {
close(wks[wkid].listen_fd);
}
char* arg[] = {listener->argv[3], NULL};
char envlistenfd[64];
sprintf(envlistenfd, "LISTEN_FD=%d", worker->listen_fd);
char envworkerid[64];
sprintf(envworkerid, "WKR_ID=%d", worker->worker_id);
char envworkercount[64];
sprintf(envworkercount, "WKR_COUNT=%d", listener->worker_count);
char envshmid[64];
sprintf(envshmid, "SHM_ID=%d", listener->shm_id);
char envshmsize[64];
sprintf(envshmsize, "SHM_SIZE=%d", listener->shm_size);
char* env[] = {envlistenfd, envworkerid, envworkercount, envshmid, envshmsize, NULL};
execve(listener->argv[3], arg, env);
exit(EXIT_FAILURE); // will never reach
} else {
return pid;
}
}
void exit_cb(struct ev_loop* loop, struct ev_child* cwatcher, int status) {
struct worker_s* worker = container_of(cwatcher, struct worker_s, cwatcher);
ev_child_stop(loop, cwatcher);
err("worker[pid:%d] exit with status:%d, stop_moniter:%d", worker->pid, cwatcher->rstatus, worker->listener->stop_moniter);
struct timeval tv;
gettimeofday(&tv, 0);
if (worker->listener->stop_moniter || 2 > ((int)tv.tv_sec - worker->starttime)) {
return;
}
worker->pid = spawn_worker(worker);
if (-1 == worker->pid) {
err("spawn worker failed, worker_id:%d", worker->worker_id);
exit(EXIT_FAILURE);
}
err("worker %d restart, new pid: %d", worker->worker_id, worker->pid);
ev_child_set(cwatcher, worker->pid, 0);
ev_child_start(loop, cwatcher);
}
int setup_workers(struct ev_loop* loop, struct listener_s* listener) {
char* ip = listener->argv[1];
uint16_t port = (uint16_t)atoi(listener->argv[2]);
int listen_fd;
#ifndef SO_REUSEPORT
listen_fd = start_listen(ip, port);
#endif
pid_t pid;
int i;
struct worker_s* workers = listener->workers;
for (i = 0; i < listener->worker_count; i++) {
#ifdef SO_REUSEPORT
listen_fd = start_listen(ip, port);
#endif
workers[i].listen_fd = listen_fd;
workers[i].worker_id = i;
workers[i].listener = listener;
pid = spawn_worker(&workers[i]);
if (pid < 0) {
return -1;
}
workers[i].pid = pid;
ev_child_init(&workers[i].cwatcher, exit_cb, pid, 0);
ev_child_start(loop, &workers[i].cwatcher);
}
return 0;
}
void signal_workers(struct listener_s* listener, int sig) {
int worker_count = listener->worker_count;
for (;worker_count--;) {
err("pid:%d",listener->workers[worker_count].pid);
kill(listener->workers[worker_count].pid, sig);
}
}
void listener_stop(struct ev_loop* loop, struct ev_signal* quitwatcher, int status) {
struct listener_s* listener = (struct listener_s*)ev_userdata(loop);
err("listener_stop:%d", listener->stop_moniter);
listener->stop_moniter = 1;
signal_workers(listener, SIGQUIT);
}
void restart_workers(struct ev_loop* loop, struct ev_signal* hupwatcher, int status) {
struct listener_s* listener = (struct listener_s*)ev_userdata(loop);
listener->stop_moniter = 0;
signal_workers(listener, SIGQUIT);
}
int shm_alloc(key_t key, size_t size) {
if (!key) {
key = IPC_PRIVATE;
}
int id = shmget(key, size, (SHM_R|SHM_W|IPC_CREAT));
if (id == -1) {
perror("shmget");
}
return id;
}
void* shm_attach(int shmid) {
void* addr = shmat(shmid, NULL, 0);
if (addr == (void*)-1) {
return NULL;
}
return addr;
}
int shm_detach(void* addr) {
return shmdt(addr);
}
void shm_free(int shmid) {
if (shmctl(shmid, IPC_RMID, NULL) == -1) {
perror("shmctl(IPC_RMID)");
}
}
int main(int argc, char** argv) {
if (argc < 4) {
printf("Usage: %s ip port path2worker [shmsize]\n", argv[0]);
return EXIT_FAILURE;
}
struct listener_s listener;
listener.argc = argc;
listener.argv = argv;
listener.stop_moniter = 0;
listener.shm_id = -1;
listener.shm_size = -1;
if (argc > 4) {
listener.shm_size = atoi(argv[4]);
if (listener.shm_size > 0) {
listener.shm_id = shm_alloc(0, listener.shm_size);
}
if (listener.shm_id != -1) {
shm_free(listener.shm_id); // lazy free
}
}
// get loop
struct ev_loop* loop = ev_default_loop(EVBACKEND_EPOLL);
ev_set_userdata(loop, &listener);
// setup signal handler
struct ev_signal quitwatcher;
struct ev_signal hupwatcher;
ev_signal_init(&quitwatcher, listener_stop, SIGQUIT);
ev_signal_init(&hupwatcher, restart_workers, SIGHUP);
ev_signal_start(loop, &quitwatcher);
ev_unref(loop); // 将loop中的watchercnt--,保证不停止此watcher的情况下loop也能正常退出
ev_signal_start(loop, &hupwatcher);
ev_unref(loop); // 将loop中的watchercnt--,保证不停止此watcher的情况下loop也能正常退出
// get cpu number
listener.worker_count = (int)sysconf(_SC_NPROCESSORS_CONF);
// init workers
struct worker_s workers[listener.worker_count];
listener.workers = &workers[0];
if (0 != setup_workers(loop, &listener)) {
return EXIT_FAILURE;
}
int r = ev_run(loop, 0);
ev_ref(loop);
ev_signal_stop(loop, &quitwatcher);
ev_ref(loop);
ev_signal_stop(loop, &hupwatcher);
return r;
}