84 lines
1.9 KiB
C
84 lines
1.9 KiB
C
#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <sys/epoll.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "server.h"
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static int kvs_write_u8(uint8_t **pp, uint8_t v) {
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uint8_t *p = *pp;
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*p = v;
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*pp = p + 1;
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return 0;
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}
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static int kvs_write_u32(uint8_t **pp, uint32_t v) {
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uint8_t *p = *pp;
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uint32_t be = htonl(v);
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memcpy(p, &be, 4);
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*pp = p + 4;
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return 0;
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}
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static uint64_t kvs_get_log_tail_offset(void) {
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int fd = open("kvs_cmd_log.db", O_RDONLY);
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if (fd < 0) {
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// 文件不存在：从 0 开始同步
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if (errno == ENOENT) return 0;
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// 其他错误：保守起见从 0 开始
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return 0;
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}
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off_t end = lseek(fd, 0, SEEK_END);
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close(fd);
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if (end < 0) return 0;
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return (uint64_t)end; // 指向 EOF（下一次写入的位置）
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}
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int try_connect_master(char *ip, int port){
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struct sockaddr_in addr;
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memset(&addr, 0, sizeof(struct sockaddr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(port);
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addr.sin_addr.s_addr = inet_addr(ip);
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int rt = 1;
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while(1){
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int fd = socket(AF_INET, SOCK_STREAM, 0);
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if(fd < 0){
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continue;
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}
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if(0 == connect(fd, (struct sockaddr*)&addr, sizeof(struct sockaddr_in))){
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// [OP KVS_CMD_PSYNC=15][ARGC 1][ARGLEN 4][ARG offset]
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char buf[100];
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char *p = buf;
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kvs_write_u8((uint8_t**)&p, 15);
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kvs_write_u8((uint8_t**)&p, 1);
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uint64_t len = sizeof(uint64_t);
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kvs_write_u32((uint8_t**)&p, len);
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uint64_t offset = kvs_get_log_tail_offset();
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memcpy(p, (void*)&offset, len);
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p += sizeof(offset);
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send(fd, buf, p-buf, 0);
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recv(fd, buf, 100, 0);
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return fd;
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}
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close(fd);
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}
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return -1;
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} |