| 1 | #include "fmacros.h" |
| 2 | #include <stdlib.h> |
| 3 | #include <stdio.h> |
| 4 | #include <string.h> |
| 5 | #include <unistd.h> |
| 6 | #include <sys/stat.h> |
| 7 | #include "config.h" |
| 8 | |
| 9 | #define ERROR(...) { \ |
| 10 | char __buf[1024]; \ |
| 11 | sprintf(__buf, __VA_ARGS__); \ |
| 12 | sprintf(error, "0x%08lx: %s", epos, __buf); \ |
| 13 | } |
| 14 | |
| 15 | static char error[1024]; |
| 16 | static long epos; |
| 17 | |
| 18 | int consumeNewline(char *buf) { |
| 19 | if (strncmp(buf,"\r\n",2) != 0) { |
| 20 | ERROR("Expected \\r\\n, got: %02x%02x",buf[0],buf[1]); |
| 21 | return 0; |
| 22 | } |
| 23 | return 1; |
| 24 | } |
| 25 | |
| 26 | int readLong(FILE *fp, char prefix, long *target) { |
| 27 | char buf[128], *eptr; |
| 28 | epos = ftell(fp); |
| 29 | if (fgets(buf,sizeof(buf),fp) == NULL) { |
| 30 | return 0; |
| 31 | } |
| 32 | if (buf[0] != prefix) { |
| 33 | ERROR("Expected prefix '%c', got: '%c'",buf[0],prefix); |
| 34 | return 0; |
| 35 | } |
| 36 | *target = strtol(buf+1,&eptr,10); |
| 37 | return consumeNewline(eptr); |
| 38 | } |
| 39 | |
| 40 | int readBytes(FILE *fp, char *target, long length) { |
| 41 | long real; |
| 42 | epos = ftell(fp); |
| 43 | real = fread(target,1,length,fp); |
| 44 | if (real != length) { |
| 45 | ERROR("Expected to read %ld bytes, got %ld bytes",length,real); |
| 46 | return 0; |
| 47 | } |
| 48 | return 1; |
| 49 | } |
| 50 | |
| 51 | int readString(FILE *fp, char** target) { |
| 52 | long len; |
| 53 | *target = NULL; |
| 54 | if (!readLong(fp,'$',&len)) { |
| 55 | return 0; |
| 56 | } |
| 57 | |
| 58 | /* Increase length to also consume \r\n */ |
| 59 | len += 2; |
| 60 | *target = (char*)malloc(len); |
| 61 | if (!readBytes(fp,*target,len)) { |
| 62 | return 0; |
| 63 | } |
| 64 | if (!consumeNewline(*target+len-2)) { |
| 65 | return 0; |
| 66 | } |
| 67 | (*target)[len-2] = '\0'; |
| 68 | return 1; |
| 69 | } |
| 70 | |
| 71 | int readArgc(FILE *fp, long *target) { |
| 72 | return readLong(fp,'*',target); |
| 73 | } |
| 74 | |
| 75 | long process(FILE *fp) { |
| 76 | long argc, pos = 0; |
| 77 | int i, multi = 0; |
| 78 | char *str; |
| 79 | |
| 80 | while(1) { |
| 81 | if (!multi) pos = ftell(fp); |
| 82 | if (!readArgc(fp, &argc)) break; |
| 83 | |
| 84 | for (i = 0; i < argc; i++) { |
| 85 | if (!readString(fp,&str)) break; |
| 86 | if (i == 0) { |
| 87 | if (strcasecmp(str, "multi") == 0) { |
| 88 | if (multi++) { |
| 89 | ERROR("Unexpected MULTI"); |
| 90 | break; |
| 91 | } |
| 92 | } else if (strcasecmp(str, "exec") == 0) { |
| 93 | if (--multi) { |
| 94 | ERROR("Unexpected EXEC"); |
| 95 | break; |
| 96 | } |
| 97 | } |
| 98 | } |
| 99 | free(str); |
| 100 | } |
| 101 | |
| 102 | /* Stop if the loop did not finish */ |
| 103 | if (i < argc) { |
| 104 | if (str) free(str); |
| 105 | break; |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | if (feof(fp) && multi && strlen(error) == 0) { |
| 110 | ERROR("Reached EOF before reading EXEC for MULTI"); |
| 111 | } |
| 112 | if (strlen(error) > 0) { |
| 113 | printf("%s\n", error); |
| 114 | } |
| 115 | return pos; |
| 116 | } |
| 117 | |
| 118 | int main(int argc, char **argv) { |
| 119 | char *filename; |
| 120 | int fix = 0; |
| 121 | |
| 122 | if (argc < 2) { |
| 123 | printf("Usage: %s [--fix] <file.aof>\n", argv[0]); |
| 124 | exit(1); |
| 125 | } else if (argc == 2) { |
| 126 | filename = argv[1]; |
| 127 | } else if (argc == 3) { |
| 128 | if (strcmp(argv[1],"--fix") != 0) { |
| 129 | printf("Invalid argument: %s\n", argv[1]); |
| 130 | exit(1); |
| 131 | } |
| 132 | filename = argv[2]; |
| 133 | fix = 1; |
| 134 | } else { |
| 135 | printf("Invalid arguments\n"); |
| 136 | exit(1); |
| 137 | } |
| 138 | |
| 139 | FILE *fp = fopen(filename,"r+"); |
| 140 | if (fp == NULL) { |
| 141 | printf("Cannot open file: %s\n", filename); |
| 142 | exit(1); |
| 143 | } |
| 144 | |
| 145 | struct redis_stat sb; |
| 146 | if (redis_fstat(fileno(fp),&sb) == -1) { |
| 147 | printf("Cannot stat file: %s\n", filename); |
| 148 | exit(1); |
| 149 | } |
| 150 | |
| 151 | long size = sb.st_size; |
| 152 | if (size == 0) { |
| 153 | printf("Empty file: %s\n", filename); |
| 154 | exit(1); |
| 155 | } |
| 156 | |
| 157 | long pos = process(fp); |
| 158 | long diff = size-pos; |
| 159 | if (diff > 0) { |
| 160 | if (fix) { |
| 161 | char buf[2]; |
| 162 | printf("This will shrink the AOF from %ld bytes, with %ld bytes, to %ld bytes\n",size,diff,pos); |
| 163 | printf("Continue? [y/N]: "); |
| 164 | if (fgets(buf,sizeof(buf),stdin) == NULL || |
| 165 | strncasecmp(buf,"y",1) != 0) { |
| 166 | printf("Aborting...\n"); |
| 167 | exit(1); |
| 168 | } |
| 169 | if (ftruncate(fileno(fp), pos) == -1) { |
| 170 | printf("Failed to truncate AOF\n"); |
| 171 | exit(1); |
| 172 | } else { |
| 173 | printf("Successfully truncated AOF\n"); |
| 174 | } |
| 175 | } else { |
| 176 | printf("AOF is not valid\n"); |
| 177 | exit(1); |
| 178 | } |
| 179 | } else { |
| 180 | printf("AOF is valid\n"); |
| 181 | } |
| 182 | |
| 183 | fclose(fp); |
| 184 | return 0; |
| 185 | } |