redict/src/t_string.c

#include "redis.h"

/*-----------------------------------------------------------------------------
 * String Commands
 *----------------------------------------------------------------------------*/

void setGenericCommand(redisClient *c, int nx, robj *key, robj *val, robj *expire) {
    int retval;
    long seconds = 0; /* initialized to avoid an harmness warning */

    if (expire) {
        if (getLongFromObjectOrReply(c, expire, &seconds, NULL) != REDIS_OK)
            return;
        if (seconds <= 0) {
            addReplyError(c,"invalid expire time in SETEX");
            return;
        }
    }

    retval = dbAdd(c->db,key,val);
    if (retval == REDIS_ERR) {
        if (!nx) {
            dbReplace(c->db,key,val);
            incrRefCount(val);
        } else {
            addReply(c,shared.czero);
            return;
        }
    } else {
        incrRefCount(val);
    }
    touchWatchedKey(c->db,key);
    server.dirty++;
    removeExpire(c->db,key);
    if (expire) setExpire(c->db,key,time(NULL)+seconds);
    addReply(c, nx ? shared.cone : shared.ok);
}

void setCommand(redisClient *c) {
    setGenericCommand(c,0,c->argv[1],c->argv[2],NULL);
}

void setnxCommand(redisClient *c) {
    setGenericCommand(c,1,c->argv[1],c->argv[2],NULL);
}

void setexCommand(redisClient *c) {
    setGenericCommand(c,0,c->argv[1],c->argv[3],c->argv[2]);
}

int getGenericCommand(redisClient *c) {
    robj *o;

    if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.nullbulk)) == NULL)
        return REDIS_OK;

    if (o->type != REDIS_STRING) {
        addReply(c,shared.wrongtypeerr);
        return REDIS_ERR;
    } else {
        addReplyBulk(c,o);
        return REDIS_OK;
    }
}

void getCommand(redisClient *c) {
    getGenericCommand(c);
}

void getsetCommand(redisClient *c) {
    if (getGenericCommand(c) == REDIS_ERR) return;
    dbReplace(c->db,c->argv[1],c->argv[2]);
    incrRefCount(c->argv[2]);
    touchWatchedKey(c->db,c->argv[1]);
    server.dirty++;
    removeExpire(c->db,c->argv[1]);
}

void mgetCommand(redisClient *c) {
    int j;

    addReplyMultiBulkLen(c,c->argc-1);
    for (j = 1; j < c->argc; j++) {
        robj *o = lookupKeyRead(c->db,c->argv[j]);
        if (o == NULL) {
            addReply(c,shared.nullbulk);
        } else {
            if (o->type != REDIS_STRING) {
                addReply(c,shared.nullbulk);
            } else {
                addReplyBulk(c,o);
            }
        }
    }
}

void msetGenericCommand(redisClient *c, int nx) {
    int j, busykeys = 0;

    if ((c->argc % 2) == 0) {
        addReplyError(c,"wrong number of arguments for MSET");
        return;
    }
    /* Handle the NX flag. The MSETNX semantic is to return zero and don't
     * set nothing at all if at least one already key exists. */
    if (nx) {
        for (j = 1; j < c->argc; j += 2) {
            if (lookupKeyWrite(c->db,c->argv[j]) != NULL) {
                busykeys++;
            }
        }
    }
    if (busykeys) {
        addReply(c, shared.czero);
        return;
    }

    for (j = 1; j < c->argc; j += 2) {
        c->argv[j+1] = tryObjectEncoding(c->argv[j+1]);
        dbReplace(c->db,c->argv[j],c->argv[j+1]);
        incrRefCount(c->argv[j+1]);
        removeExpire(c->db,c->argv[j]);
        touchWatchedKey(c->db,c->argv[j]);
    }
    server.dirty += (c->argc-1)/2;
    addReply(c, nx ? shared.cone : shared.ok);
}

void msetCommand(redisClient *c) {
    msetGenericCommand(c,0);
}

void msetnxCommand(redisClient *c) {
    msetGenericCommand(c,1);
}

void incrDecrCommand(redisClient *c, long long incr) {
    long long value;
    robj *o;

    o = lookupKeyWrite(c->db,c->argv[1]);
    if (o != NULL && checkType(c,o,REDIS_STRING)) return;
    if (getLongLongFromObjectOrReply(c,o,&value,NULL) != REDIS_OK) return;

    value += incr;
    o = createStringObjectFromLongLong(value);
    dbReplace(c->db,c->argv[1],o);
    touchWatchedKey(c->db,c->argv[1]);
    server.dirty++;
    addReply(c,shared.colon);
    addReply(c,o);
    addReply(c,shared.crlf);
}

void incrCommand(redisClient *c) {
    incrDecrCommand(c,1);
}

void decrCommand(redisClient *c) {
    incrDecrCommand(c,-1);
}

void incrbyCommand(redisClient *c) {
    long long incr;

    if (getLongLongFromObjectOrReply(c, c->argv[2], &incr, NULL) != REDIS_OK) return;
    incrDecrCommand(c,incr);
}

void decrbyCommand(redisClient *c) {
    long long incr;

    if (getLongLongFromObjectOrReply(c, c->argv[2], &incr, NULL) != REDIS_OK) return;
    incrDecrCommand(c,-incr);
}

void appendCommand(redisClient *c) {
    int retval;
    size_t totlen;
    robj *o;

    o = lookupKeyWrite(c->db,c->argv[1]);
    if (o == NULL) {
        /* Create the key */
        retval = dbAdd(c->db,c->argv[1],c->argv[2]);
        incrRefCount(c->argv[2]);
        totlen = stringObjectLen(c->argv[2]);
    } else {
        if (o->type != REDIS_STRING) {
            addReply(c,shared.wrongtypeerr);
            return;
        }
        /* If the object is specially encoded or shared we have to make
         * a copy */
        if (o->refcount != 1 || o->encoding != REDIS_ENCODING_RAW) {
            robj *decoded = getDecodedObject(o);

            o = createStringObject(decoded->ptr, sdslen(decoded->ptr));
            decrRefCount(decoded);
            dbReplace(c->db,c->argv[1],o);
        }
        /* APPEND! */
        if (c->argv[2]->encoding == REDIS_ENCODING_RAW) {
            o->ptr = sdscatlen(o->ptr,
                c->argv[2]->ptr, sdslen(c->argv[2]->ptr));
        } else {
            o->ptr = sdscatprintf(o->ptr, "%ld",
                (unsigned long) c->argv[2]->ptr);
        }
        totlen = sdslen(o->ptr);
    }
    touchWatchedKey(c->db,c->argv[1]);
    server.dirty++;
    addReplyLongLong(c,totlen);
}

void substrCommand(redisClient *c) {
    robj *o;
    long start = atoi(c->argv[2]->ptr);
    long end = atoi(c->argv[3]->ptr);
    size_t rangelen, strlen;
    sds range;

    if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.nullbulk)) == NULL ||
        checkType(c,o,REDIS_STRING)) return;

    o = getDecodedObject(o);
    strlen = sdslen(o->ptr);

    /* convert negative indexes */
    if (start < 0) start = strlen+start;
    if (end < 0) end = strlen+end;
    if (start < 0) start = 0;
    if (end < 0) end = 0;

    /* indexes sanity checks */
    if (start > end || (size_t)start >= strlen) {
        /* Out of range start or start > end result in null reply */
        addReply(c,shared.nullbulk);
        decrRefCount(o);
        return;
    }
    if ((size_t)end >= strlen) end = strlen-1;
    rangelen = (end-start)+1;

    /* Return the result */
    addReplySds(c,sdscatprintf(sdsempty(),"$%zu\r\n",rangelen));
    range = sdsnewlen((char*)o->ptr+start,rangelen);
    addReplySds(c,range);
    addReply(c,shared.crlf);
    decrRefCount(o);
}

void strlenCommand(redisClient *c) {
    robj *o;

    if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.czero)) == NULL ||
        checkType(c,o,REDIS_STRING)) return;

    o = getDecodedObject(o);
    addReplyLongLong(c,sdslen(o->ptr));
    decrRefCount(o);
}