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1 | /* | |
2 | * Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com> | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions are met: | |
7 | * | |
8 | * * Redistributions of source code must retain the above copyright notice, | |
9 | * this list of conditions and the following disclaimer. | |
10 | * * Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * * Neither the name of Redis nor the names of its contributors may be used | |
14 | * to endorse or promote products derived from this software without | |
15 | * specific prior written permission. | |
16 | * | |
17 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
18 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
21 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
22 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
23 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
24 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
25 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
26 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
27 | * POSSIBILITY OF SUCH DAMAGE. | |
28 | */ | |
29 | ||
30 | #include "redis.h" | |
31 | #include <math.h> /* isnan(), isinf() */ | |
32 | ||
33 | /*----------------------------------------------------------------------------- | |
34 | * String Commands | |
35 | *----------------------------------------------------------------------------*/ | |
36 | ||
37 | static int checkStringLength(redisClient *c, long long size) { | |
38 | if (size > 512*1024*1024) { | |
39 | addReplyError(c,"string exceeds maximum allowed size (512MB)"); | |
40 | return REDIS_ERR; | |
41 | } | |
42 | return REDIS_OK; | |
43 | } | |
44 | ||
45 | void setGenericCommand(redisClient *c, int nx, robj *key, robj *val, robj *expire, int unit) { | |
46 | long long milliseconds = 0; /* initialized to avoid an harmness warning */ | |
47 | ||
48 | if (expire) { | |
49 | if (getLongLongFromObjectOrReply(c, expire, &milliseconds, NULL) != REDIS_OK) | |
50 | return; | |
51 | if (milliseconds <= 0) { | |
52 | addReplyError(c,"invalid expire time in SETEX"); | |
53 | return; | |
54 | } | |
55 | if (unit == UNIT_SECONDS) milliseconds *= 1000; | |
56 | } | |
57 | ||
58 | if (nx && lookupKeyWrite(c->db,key) != NULL) { | |
59 | addReply(c,shared.czero); | |
60 | return; | |
61 | } | |
62 | setKey(c->db,key,val); | |
63 | server.dirty++; | |
64 | if (expire) setExpire(c->db,key,mstime()+milliseconds); | |
65 | addReply(c, nx ? shared.cone : shared.ok); | |
66 | } | |
67 | ||
68 | void setCommand(redisClient *c) { | |
69 | c->argv[2] = tryObjectEncoding(c->argv[2]); | |
70 | setGenericCommand(c,0,c->argv[1],c->argv[2],NULL,0); | |
71 | } | |
72 | ||
73 | void setnxCommand(redisClient *c) { | |
74 | c->argv[2] = tryObjectEncoding(c->argv[2]); | |
75 | setGenericCommand(c,1,c->argv[1],c->argv[2],NULL,0); | |
76 | } | |
77 | ||
78 | void setexCommand(redisClient *c) { | |
79 | c->argv[3] = tryObjectEncoding(c->argv[3]); | |
80 | setGenericCommand(c,0,c->argv[1],c->argv[3],c->argv[2],UNIT_SECONDS); | |
81 | } | |
82 | ||
83 | void psetexCommand(redisClient *c) { | |
84 | c->argv[3] = tryObjectEncoding(c->argv[3]); | |
85 | setGenericCommand(c,0,c->argv[1],c->argv[3],c->argv[2],UNIT_MILLISECONDS); | |
86 | } | |
87 | ||
88 | int getGenericCommand(redisClient *c) { | |
89 | robj *o; | |
90 | ||
91 | if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.nullbulk)) == NULL) | |
92 | return REDIS_OK; | |
93 | ||
94 | if (o->type != REDIS_STRING) { | |
95 | addReply(c,shared.wrongtypeerr); | |
96 | return REDIS_ERR; | |
97 | } else { | |
98 | addReplyBulk(c,o); | |
99 | return REDIS_OK; | |
100 | } | |
101 | } | |
102 | ||
103 | void getCommand(redisClient *c) { | |
104 | getGenericCommand(c); | |
105 | } | |
106 | ||
107 | void getsetCommand(redisClient *c) { | |
108 | if (getGenericCommand(c) == REDIS_ERR) return; | |
109 | c->argv[2] = tryObjectEncoding(c->argv[2]); | |
110 | setKey(c->db,c->argv[1],c->argv[2]); | |
111 | server.dirty++; | |
112 | } | |
113 | ||
114 | void setrangeCommand(redisClient *c) { | |
115 | robj *o; | |
116 | long offset; | |
117 | sds value = c->argv[3]->ptr; | |
118 | ||
119 | if (getLongFromObjectOrReply(c,c->argv[2],&offset,NULL) != REDIS_OK) | |
120 | return; | |
121 | ||
122 | if (offset < 0) { | |
123 | addReplyError(c,"offset is out of range"); | |
124 | return; | |
125 | } | |
126 | ||
127 | o = lookupKeyWrite(c->db,c->argv[1]); | |
128 | if (o == NULL) { | |
129 | /* Return 0 when setting nothing on a non-existing string */ | |
130 | if (sdslen(value) == 0) { | |
131 | addReply(c,shared.czero); | |
132 | return; | |
133 | } | |
134 | ||
135 | /* Return when the resulting string exceeds allowed size */ | |
136 | if (checkStringLength(c,offset+sdslen(value)) != REDIS_OK) | |
137 | return; | |
138 | ||
139 | o = createObject(REDIS_STRING,sdsempty()); | |
140 | dbAdd(c->db,c->argv[1],o); | |
141 | } else { | |
142 | size_t olen; | |
143 | ||
144 | /* Key exists, check type */ | |
145 | if (checkType(c,o,REDIS_STRING)) | |
146 | return; | |
147 | ||
148 | /* Return existing string length when setting nothing */ | |
149 | olen = stringObjectLen(o); | |
150 | if (sdslen(value) == 0) { | |
151 | addReplyLongLong(c,olen); | |
152 | return; | |
153 | } | |
154 | ||
155 | /* Return when the resulting string exceeds allowed size */ | |
156 | if (checkStringLength(c,offset+sdslen(value)) != REDIS_OK) | |
157 | return; | |
158 | ||
159 | /* Create a copy when the object is shared or encoded. */ | |
160 | if (o->refcount != 1 || o->encoding != REDIS_ENCODING_RAW) { | |
161 | robj *decoded = getDecodedObject(o); | |
162 | o = createStringObject(decoded->ptr, sdslen(decoded->ptr)); | |
163 | decrRefCount(decoded); | |
164 | dbOverwrite(c->db,c->argv[1],o); | |
165 | } | |
166 | } | |
167 | ||
168 | if (sdslen(value) > 0) { | |
169 | o->ptr = sdsgrowzero(o->ptr,offset+sdslen(value)); | |
170 | memcpy((char*)o->ptr+offset,value,sdslen(value)); | |
171 | signalModifiedKey(c->db,c->argv[1]); | |
172 | server.dirty++; | |
173 | } | |
174 | addReplyLongLong(c,sdslen(o->ptr)); | |
175 | } | |
176 | ||
177 | void getrangeCommand(redisClient *c) { | |
178 | robj *o; | |
179 | long start, end; | |
180 | char *str, llbuf[32]; | |
181 | size_t strlen; | |
182 | ||
183 | if (getLongFromObjectOrReply(c,c->argv[2],&start,NULL) != REDIS_OK) | |
184 | return; | |
185 | if (getLongFromObjectOrReply(c,c->argv[3],&end,NULL) != REDIS_OK) | |
186 | return; | |
187 | if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.emptybulk)) == NULL || | |
188 | checkType(c,o,REDIS_STRING)) return; | |
189 | ||
190 | if (o->encoding == REDIS_ENCODING_INT) { | |
191 | str = llbuf; | |
192 | strlen = ll2string(llbuf,sizeof(llbuf),(long)o->ptr); | |
193 | } else { | |
194 | str = o->ptr; | |
195 | strlen = sdslen(str); | |
196 | } | |
197 | ||
198 | /* Convert negative indexes */ | |
199 | if (start < 0) start = strlen+start; | |
200 | if (end < 0) end = strlen+end; | |
201 | if (start < 0) start = 0; | |
202 | if (end < 0) end = 0; | |
203 | if ((unsigned)end >= strlen) end = strlen-1; | |
204 | ||
205 | /* Precondition: end >= 0 && end < strlen, so the only condition where | |
206 | * nothing can be returned is: start > end. */ | |
207 | if (start > end) { | |
208 | addReply(c,shared.emptybulk); | |
209 | } else { | |
210 | addReplyBulkCBuffer(c,(char*)str+start,end-start+1); | |
211 | } | |
212 | } | |
213 | ||
214 | void mgetCommand(redisClient *c) { | |
215 | int j; | |
216 | ||
217 | addReplyMultiBulkLen(c,c->argc-1); | |
218 | for (j = 1; j < c->argc; j++) { | |
219 | robj *o = lookupKeyRead(c->db,c->argv[j]); | |
220 | if (o == NULL) { | |
221 | addReply(c,shared.nullbulk); | |
222 | } else { | |
223 | if (o->type != REDIS_STRING) { | |
224 | addReply(c,shared.nullbulk); | |
225 | } else { | |
226 | addReplyBulk(c,o); | |
227 | } | |
228 | } | |
229 | } | |
230 | } | |
231 | ||
232 | void msetGenericCommand(redisClient *c, int nx) { | |
233 | int j, busykeys = 0; | |
234 | ||
235 | if ((c->argc % 2) == 0) { | |
236 | addReplyError(c,"wrong number of arguments for MSET"); | |
237 | return; | |
238 | } | |
239 | /* Handle the NX flag. The MSETNX semantic is to return zero and don't | |
240 | * set nothing at all if at least one already key exists. */ | |
241 | if (nx) { | |
242 | for (j = 1; j < c->argc; j += 2) { | |
243 | if (lookupKeyWrite(c->db,c->argv[j]) != NULL) { | |
244 | busykeys++; | |
245 | } | |
246 | } | |
247 | if (busykeys) { | |
248 | addReply(c, shared.czero); | |
249 | return; | |
250 | } | |
251 | } | |
252 | ||
253 | for (j = 1; j < c->argc; j += 2) { | |
254 | c->argv[j+1] = tryObjectEncoding(c->argv[j+1]); | |
255 | setKey(c->db,c->argv[j],c->argv[j+1]); | |
256 | } | |
257 | server.dirty += (c->argc-1)/2; | |
258 | addReply(c, nx ? shared.cone : shared.ok); | |
259 | } | |
260 | ||
261 | void msetCommand(redisClient *c) { | |
262 | msetGenericCommand(c,0); | |
263 | } | |
264 | ||
265 | void msetnxCommand(redisClient *c) { | |
266 | msetGenericCommand(c,1); | |
267 | } | |
268 | ||
269 | void incrDecrCommand(redisClient *c, long long incr) { | |
270 | long long value, oldvalue; | |
271 | robj *o, *new; | |
272 | ||
273 | o = lookupKeyWrite(c->db,c->argv[1]); | |
274 | if (o != NULL && checkType(c,o,REDIS_STRING)) return; | |
275 | if (getLongLongFromObjectOrReply(c,o,&value,NULL) != REDIS_OK) return; | |
276 | ||
277 | oldvalue = value; | |
278 | if ((incr < 0 && oldvalue < 0 && incr < (LLONG_MIN-oldvalue)) || | |
279 | (incr > 0 && oldvalue > 0 && incr > (LLONG_MAX-oldvalue))) { | |
280 | addReplyError(c,"increment or decrement would overflow"); | |
281 | return; | |
282 | } | |
283 | value += incr; | |
284 | new = createStringObjectFromLongLong(value); | |
285 | if (o) | |
286 | dbOverwrite(c->db,c->argv[1],new); | |
287 | else | |
288 | dbAdd(c->db,c->argv[1],new); | |
289 | signalModifiedKey(c->db,c->argv[1]); | |
290 | server.dirty++; | |
291 | addReply(c,shared.colon); | |
292 | addReply(c,new); | |
293 | addReply(c,shared.crlf); | |
294 | } | |
295 | ||
296 | void incrCommand(redisClient *c) { | |
297 | incrDecrCommand(c,1); | |
298 | } | |
299 | ||
300 | void decrCommand(redisClient *c) { | |
301 | incrDecrCommand(c,-1); | |
302 | } | |
303 | ||
304 | void incrbyCommand(redisClient *c) { | |
305 | long long incr; | |
306 | ||
307 | if (getLongLongFromObjectOrReply(c, c->argv[2], &incr, NULL) != REDIS_OK) return; | |
308 | incrDecrCommand(c,incr); | |
309 | } | |
310 | ||
311 | void decrbyCommand(redisClient *c) { | |
312 | long long incr; | |
313 | ||
314 | if (getLongLongFromObjectOrReply(c, c->argv[2], &incr, NULL) != REDIS_OK) return; | |
315 | incrDecrCommand(c,-incr); | |
316 | } | |
317 | ||
318 | void incrbyfloatCommand(redisClient *c) { | |
319 | long double incr, value; | |
320 | robj *o, *new, *aux; | |
321 | ||
322 | o = lookupKeyWrite(c->db,c->argv[1]); | |
323 | if (o != NULL && checkType(c,o,REDIS_STRING)) return; | |
324 | if (getLongDoubleFromObjectOrReply(c,o,&value,NULL) != REDIS_OK || | |
325 | getLongDoubleFromObjectOrReply(c,c->argv[2],&incr,NULL) != REDIS_OK) | |
326 | return; | |
327 | ||
328 | value += incr; | |
329 | if (isnan(value) || isinf(value)) { | |
330 | addReplyError(c,"increment would produce NaN or Infinity"); | |
331 | return; | |
332 | } | |
333 | new = createStringObjectFromLongDouble(value); | |
334 | if (o) | |
335 | dbOverwrite(c->db,c->argv[1],new); | |
336 | else | |
337 | dbAdd(c->db,c->argv[1],new); | |
338 | signalModifiedKey(c->db,c->argv[1]); | |
339 | server.dirty++; | |
340 | addReplyBulk(c,new); | |
341 | ||
342 | /* Always replicate INCRBYFLOAT as a SET command with the final value | |
343 | * in order to make sure that differences in float pricision or formatting | |
344 | * will not create differences in replicas or after an AOF restart. */ | |
345 | aux = createStringObject("SET",3); | |
346 | rewriteClientCommandArgument(c,0,aux); | |
347 | decrRefCount(aux); | |
348 | rewriteClientCommandArgument(c,2,new); | |
349 | } | |
350 | ||
351 | void appendCommand(redisClient *c) { | |
352 | size_t totlen; | |
353 | robj *o, *append; | |
354 | ||
355 | o = lookupKeyWrite(c->db,c->argv[1]); | |
356 | if (o == NULL) { | |
357 | /* Create the key */ | |
358 | c->argv[2] = tryObjectEncoding(c->argv[2]); | |
359 | dbAdd(c->db,c->argv[1],c->argv[2]); | |
360 | incrRefCount(c->argv[2]); | |
361 | totlen = stringObjectLen(c->argv[2]); | |
362 | } else { | |
363 | /* Key exists, check type */ | |
364 | if (checkType(c,o,REDIS_STRING)) | |
365 | return; | |
366 | ||
367 | /* "append" is an argument, so always an sds */ | |
368 | append = c->argv[2]; | |
369 | totlen = stringObjectLen(o)+sdslen(append->ptr); | |
370 | if (checkStringLength(c,totlen) != REDIS_OK) | |
371 | return; | |
372 | ||
373 | /* If the object is shared or encoded, we have to make a copy */ | |
374 | if (o->refcount != 1 || o->encoding != REDIS_ENCODING_RAW) { | |
375 | robj *decoded = getDecodedObject(o); | |
376 | o = createStringObject(decoded->ptr, sdslen(decoded->ptr)); | |
377 | decrRefCount(decoded); | |
378 | dbOverwrite(c->db,c->argv[1],o); | |
379 | } | |
380 | ||
381 | /* Append the value */ | |
382 | o->ptr = sdscatlen(o->ptr,append->ptr,sdslen(append->ptr)); | |
383 | totlen = sdslen(o->ptr); | |
384 | } | |
385 | signalModifiedKey(c->db,c->argv[1]); | |
386 | server.dirty++; | |
387 | addReplyLongLong(c,totlen); | |
388 | } | |
389 | ||
390 | void strlenCommand(redisClient *c) { | |
391 | robj *o; | |
392 | if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.czero)) == NULL || | |
393 | checkType(c,o,REDIS_STRING)) return; | |
394 | addReplyLongLong(c,stringObjectLen(o)); | |
395 | } |