src/t_string.c

   1 #include "redis.h"
   2
   3 /*-----------------------------------------------------------------------------
   4  * String Commands
   5  *----------------------------------------------------------------------------*/
   6
   7 void setGenericCommand(redisClient *c, int nx, robj *key, robj *val, robj *expire) {
   8     int retval;
   9     long seconds = 0; /* initialized to avoid an harmness warning */
  10
  11     if (expire) {
  12         if (getLongFromObjectOrReply(c, expire, &seconds, NULL) != REDIS_OK)
  13             return;
  14         if (seconds <= 0) {
  15             addReplyError(c,"invalid expire time in SETEX");
  16             return;
  17         }
  18     }
  19
  20     retval = dbAdd(c->db,key,val);
  21     if (retval == REDIS_ERR) {
  22         if (!nx) {
  23             dbReplace(c->db,key,val);
  24             incrRefCount(val);
  25         } else {
  26             addReply(c,shared.czero);
  27             return;
  28         }
  29     } else {
  30         incrRefCount(val);
  31     }
  32     touchWatchedKey(c->db,key);
  33     server.dirty++;
  34     removeExpire(c->db,key);
  35     if (expire) setExpire(c->db,key,time(NULL)+seconds);
  36     addReply(c, nx ? shared.cone : shared.ok);
  37 }
  38
  39 void setCommand(redisClient *c) {
  40     c->argv[2] = tryObjectEncoding(c->argv[2]);
  41     setGenericCommand(c,0,c->argv[1],c->argv[2],NULL);
  42 }
  43
  44 void setnxCommand(redisClient *c) {
  45     c->argv[2] = tryObjectEncoding(c->argv[2]);
  46     setGenericCommand(c,1,c->argv[1],c->argv[2],NULL);
  47 }
  48
  49 void setexCommand(redisClient *c) {
  50     c->argv[3] = tryObjectEncoding(c->argv[3]);
  51     setGenericCommand(c,0,c->argv[1],c->argv[3],c->argv[2]);
  52 }
  53
  54 int getGenericCommand(redisClient *c) {
  55     robj *o;
  56
  57     if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.nullbulk)) == NULL)
  58         return REDIS_OK;
  59
  60     if (o->type != REDIS_STRING) {
  61         addReply(c,shared.wrongtypeerr);
  62         return REDIS_ERR;
  63     } else {
  64         addReplyBulk(c,o);
  65         return REDIS_OK;
  66     }
  67 }
  68
  69 void getCommand(redisClient *c) {
  70     getGenericCommand(c);
  71 }
  72
  73 void getsetCommand(redisClient *c) {
  74     if (getGenericCommand(c) == REDIS_ERR) return;
  75     c->argv[2] = tryObjectEncoding(c->argv[2]);
  76     dbReplace(c->db,c->argv[1],c->argv[2]);
  77     incrRefCount(c->argv[2]);
  78     touchWatchedKey(c->db,c->argv[1]);
  79     server.dirty++;
  80     removeExpire(c->db,c->argv[1]);
  81 }
  82
  83 void mgetCommand(redisClient *c) {
  84     int j;
  85
  86     addReplyMultiBulkLen(c,c->argc-1);
  87     for (j = 1; j < c->argc; j++) {
  88         robj *o = lookupKeyRead(c->db,c->argv[j]);
  89         if (o == NULL) {
  90             addReply(c,shared.nullbulk);
  91         } else {
  92             if (o->type != REDIS_STRING) {
  93                 addReply(c,shared.nullbulk);
  94             } else {
  95                 addReplyBulk(c,o);
  96             }
  97         }
  98     }
  99 }
 100
 101 void msetGenericCommand(redisClient *c, int nx) {
 102     int j, busykeys = 0;
 103
 104     if ((c->argc % 2) == 0) {
 105         addReplyError(c,"wrong number of arguments for MSET");
 106         return;
 107     }
 108     /* Handle the NX flag. The MSETNX semantic is to return zero and don't
 109      * set nothing at all if at least one already key exists. */
 110     if (nx) {
 111         for (j = 1; j < c->argc; j += 2) {
 112             if (lookupKeyWrite(c->db,c->argv[j]) != NULL) {
 113                 busykeys++;
 114             }
 115         }
 116     }
 117     if (busykeys) {
 118         addReply(c, shared.czero);
 119         return;
 120     }
 121
 122     for (j = 1; j < c->argc; j += 2) {
 123         c->argv[j+1] = tryObjectEncoding(c->argv[j+1]);
 124         dbReplace(c->db,c->argv[j],c->argv[j+1]);
 125         incrRefCount(c->argv[j+1]);
 126         removeExpire(c->db,c->argv[j]);
 127         touchWatchedKey(c->db,c->argv[j]);
 128     }
 129     server.dirty += (c->argc-1)/2;
 130     addReply(c, nx ? shared.cone : shared.ok);
 131 }
 132
 133 void msetCommand(redisClient *c) {
 134     msetGenericCommand(c,0);
 135 }
 136
 137 void msetnxCommand(redisClient *c) {
 138     msetGenericCommand(c,1);
 139 }
 140
 141 void incrDecrCommand(redisClient *c, long long incr) {
 142     long long value;
 143     robj *o;
 144
 145     o = lookupKeyWrite(c->db,c->argv[1]);
 146     if (o != NULL && checkType(c,o,REDIS_STRING)) return;
 147
 148     /* Fast path if the object is integer encoded and is not shared. */
 149     if (o && o->refcount == 1 && o->encoding == REDIS_ENCODING_INT) {
 150         long long newval = ((long)o->ptr) + incr;
 151
 152         if (newval >= LONG_MIN && newval <= LONG_MAX) {
 153             o->ptr = (void*) (long) newval;
 154             touchWatchedKey(c->db,c->argv[1]);
 155             server.dirty++;
 156             addReplyLongLong(c,newval);
 157             return;
 158         }
 159         /* ... else take the usual safe path */
 160     }
 161
 162     /* Otherwise we create a new object and replace the old one. */
 163     if (getLongLongFromObjectOrReply(c,o,&value,NULL) != REDIS_OK) return;
 164     value += incr;
 165     o = createStringObjectFromLongLong(value);
 166     dbReplace(c->db,c->argv[1],o);
 167     touchWatchedKey(c->db,c->argv[1]);
 168     server.dirty++;
 169     addReply(c,shared.colon);
 170     addReply(c,o);
 171     addReply(c,shared.crlf);
 172 }
 173
 174 void incrCommand(redisClient *c) {
 175     incrDecrCommand(c,1);
 176 }
 177
 178 void decrCommand(redisClient *c) {
 179     incrDecrCommand(c,-1);
 180 }
 181
 182 void incrbyCommand(redisClient *c) {
 183     long long incr;
 184
 185     if (getLongLongFromObjectOrReply(c, c->argv[2], &incr, NULL) != REDIS_OK) return;
 186     incrDecrCommand(c,incr);
 187 }
 188
 189 void decrbyCommand(redisClient *c) {
 190     long long incr;
 191
 192     if (getLongLongFromObjectOrReply(c, c->argv[2], &incr, NULL) != REDIS_OK) return;
 193     incrDecrCommand(c,-incr);
 194 }
 195
 196 void appendCommand(redisClient *c) {
 197     int retval;
 198     size_t totlen;
 199     robj *o;
 200
 201     o = lookupKeyWrite(c->db,c->argv[1]);
 202     c->argv[2] = tryObjectEncoding(c->argv[2]);
 203     if (o == NULL) {
 204         /* Create the key */
 205         retval = dbAdd(c->db,c->argv[1],c->argv[2]);
 206         incrRefCount(c->argv[2]);
 207         totlen = stringObjectLen(c->argv[2]);
 208     } else {
 209         if (o->type != REDIS_STRING) {
 210             addReply(c,shared.wrongtypeerr);
 211             return;
 212         }
 213         /* If the object is specially encoded or shared we have to make
 214          * a copy */
 215         if (o->refcount != 1 || o->encoding != REDIS_ENCODING_RAW) {
 216             robj *decoded = getDecodedObject(o);
 217
 218             o = createStringObject(decoded->ptr, sdslen(decoded->ptr));
 219             decrRefCount(decoded);
 220             dbReplace(c->db,c->argv[1],o);
 221         }
 222         /* APPEND! */
 223         if (c->argv[2]->encoding == REDIS_ENCODING_RAW) {
 224             o->ptr = sdscatlen(o->ptr,
 225                 c->argv[2]->ptr, sdslen(c->argv[2]->ptr));
 226         } else {
 227             o->ptr = sdscatprintf(o->ptr, "%ld",
 228                 (unsigned long) c->argv[2]->ptr);
 229         }
 230         totlen = sdslen(o->ptr);
 231     }
 232     touchWatchedKey(c->db,c->argv[1]);
 233     server.dirty++;
 234     addReplyLongLong(c,totlen);
 235 }
 236
 237 void substrCommand(redisClient *c) {
 238     robj *o;
 239     long start = atoi(c->argv[2]->ptr);
 240     long end = atoi(c->argv[3]->ptr);
 241     size_t rangelen, strlen;
 242     sds range;
 243
 244     if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.nullbulk)) == NULL ||
 245         checkType(c,o,REDIS_STRING)) return;
 246
 247     o = getDecodedObject(o);
 248     strlen = sdslen(o->ptr);
 249
 250     /* convert negative indexes */
 251     if (start < 0) start = strlen+start;
 252     if (end < 0) end = strlen+end;
 253     if (start < 0) start = 0;
 254     if (end < 0) end = 0;
 255
 256     /* indexes sanity checks */
 257     if (start > end || (size_t)start >= strlen) {
 258         /* Out of range start or start > end result in null reply */
 259         addReply(c,shared.nullbulk);
 260         decrRefCount(o);
 261         return;
 262     }
 263     if ((size_t)end >= strlen) end = strlen-1;
 264     rangelen = (end-start)+1;
 265
 266     /* Return the result */
 267     addReplySds(c,sdscatprintf(sdsempty(),"$%zu\r\n",rangelen));
 268     range = sdsnewlen((char*)o->ptr+start,rangelen);
 269     addReplySds(c,range);
 270     addReply(c,shared.crlf);
 271     decrRefCount(o);
 272 }
 273
 274 void strlenCommand(redisClient *c) {
 275     robj *o;
 276
 277     if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.czero)) == NULL ||
 278         checkType(c,o,REDIS_STRING)) return;
 279
 280     o = getDecodedObject(o);
 281     addReplyLongLong(c,sdslen(o->ptr));
 282     decrRefCount(o);
 283 }