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