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