111 lines
2.5 KiB
C
111 lines
2.5 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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/* 创建并监听用于接收快照的 TCP 监听 socket，成功返回 listen fd，失败返回 -1 */
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static int create_listen_socket(const char *ip, int port){
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}
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/* 主动连接 master 指定地址，用于控制面通信（SSYNC / SREADY），返回连接 fd 或 -1 */
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static int connect_master(const char *master_ip, int master_port){
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}
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/* 通过控制连接向 master 发送 SSYNC 请求，声明本 slave 的快照接收地址 */
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static int send_ssync(int ctrl_fd, const char *listen_ip, int listen_port){
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}
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/* 接收并校验 master 对 SSYNC 的确认响应（如 +OK），成功返回 0 */
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static int recv_ssync_ok(int ctrl_fd){
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}
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/* 在快照监听 socket 上阻塞等待 master 的快照发送连接，返回已建立连接的 fd */
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static int accept_snapshot_conn(int listen_fd){
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}
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/* 从快照连接中接收完整快照数据并构建内存状态，确保快照已完全应用 */
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static int recv_and_apply_snapshot(int snapshot_fd){
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}
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/* 通过控制连接向 master 发送 SREADY 通知，表示快照已应用，slave 即将进入服务态 */
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int send_sready(int ctrl_fd){
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}
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int slave_bootstrap(
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const char *listen_ip,
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int listen_port,
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const char *master_ip,
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int master_port
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) {
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int listen_fd = -1;
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int ctrl_fd = -1;
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int snap_fd = -1;
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/* 1. 监听 snapshot port */
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listen_fd = create_listen_socket(listen_ip, listen_port);
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if (listen_fd < 0) {
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goto fail;
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}
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/* 2. 连接 master, 发送 SSYNC */
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ctrl_fd = connect_master(master_ip, master_port);
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if (ctrl_fd < 0) {
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goto fail;
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}
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if (send_ssync(ctrl_fd, listen_ip, listen_port) < 0) {
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goto fail;
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}
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if (recv_ssync_ok(ctrl_fd) < 0) {
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goto fail;
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}
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close(ctrl_fd);
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ctrl_fd = -1;
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/* 3. accept snapshot 连接 */
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snap_fd = accept_snapshot_conn(listen_fd);
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if (snap_fd < 0) {
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goto fail;
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}
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/* 4. 接收 snapshot */
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if (recv_and_apply_snapshot(snap_fd) < 0) {
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goto fail;
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}
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close(snap_fd);
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snap_fd = -1;
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close(listen_fd);
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listen_fd = -1;
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/* 5. 通知 master 快照传输完毕 */
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ctrl_fd = connect_master(master_ip, master_port);
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if (ctrl_fd >= 0) {
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send_sready(ctrl_fd);
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close(ctrl_fd);
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ctrl_fd = -1;
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}
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/* 6. bootstrap complete */
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return 0;
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fail:
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if (snap_fd >= 0) close(snap_fd);
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if (ctrl_fd >= 0) close(ctrl_fd);
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if (listen_fd >= 0) close(listen_fd);
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return -1;
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}
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