[redis.git] / src / object.c

#include "redis.h"
#include <pthread.h>
#include <math.h>

robj *createObject(int type, void *ptr) {
    robj *o = zmalloc(sizeof(*o));
    o->type = type;
    o->encoding = REDIS_ENCODING_RAW;
    o->ptr = ptr;
    o->refcount = 1;

    /* Set the LRU to the current lruclock (minutes resolution).
     * We do this regardless of the fact VM is active as LRU is also
     * used for the maxmemory directive when Redis is used as cache.
     *
     * Note that this code may run in the context of an I/O thread
     * and accessing server.lruclock in theory is an error
     * (no locks). But in practice this is safe, and even if we read
     * garbage Redis will not fail. */
    o->lru = server.lruclock;
    /* The following is only needed if VM is active, but since the conditional
     * is probably more costly than initializing the field it's better to
     * have every field properly initialized anyway. */
    o->storage = REDIS_DS_MEMORY;
    return o;
}

robj *createStringObject(char *ptr, size_t len) {
    return createObject(REDIS_STRING,sdsnewlen(ptr,len));
}

robj *createStringObjectFromLongLong(long long value) {
    robj *o;
    if (value >= 0 && value < REDIS_SHARED_INTEGERS &&
        !server.ds_enabled &&
        pthread_equal(pthread_self(),server.mainthread)) {
        incrRefCount(shared.integers[value]);
        o = shared.integers[value];
    } else {
        if (value >= LONG_MIN && value <= LONG_MAX) {
            o = createObject(REDIS_STRING, NULL);
            o->encoding = REDIS_ENCODING_INT;
            o->ptr = (void*)((long)value);
        } else {
            o = createObject(REDIS_STRING,sdsfromlonglong(value));
        }
    }
    return o;
}

robj *dupStringObject(robj *o) {
    redisAssert(o->encoding == REDIS_ENCODING_RAW);
    return createStringObject(o->ptr,sdslen(o->ptr));
}

robj *createListObject(void) {
    list *l = listCreate();
    robj *o = createObject(REDIS_LIST,l);
    listSetFreeMethod(l,decrRefCount);
    o->encoding = REDIS_ENCODING_LINKEDLIST;
    return o;
}

robj *createZiplistObject(void) {
    unsigned char *zl = ziplistNew();
    robj *o = createObject(REDIS_LIST,zl);
    o->encoding = REDIS_ENCODING_ZIPLIST;
    return o;
}

robj *createSetObject(void) {
    dict *d = dictCreate(&setDictType,NULL);
    robj *o = createObject(REDIS_SET,d);
    o->encoding = REDIS_ENCODING_HT;
    return o;
}

robj *createIntsetObject(void) {
    intset *is = intsetNew();
    robj *o = createObject(REDIS_SET,is);
    o->encoding = REDIS_ENCODING_INTSET;
    return o;
}

robj *createHashObject(void) {
    /* All the Hashes start as zipmaps. Will be automatically converted
     * into hash tables if there are enough elements or big elements
     * inside. */
    unsigned char *zm = zipmapNew();
    robj *o = createObject(REDIS_HASH,zm);
    o->encoding = REDIS_ENCODING_ZIPMAP;
    return o;
}

robj *createZsetObject(void) {
    zset *zs = zmalloc(sizeof(*zs));

    zs->dict = dictCreate(&zsetDictType,NULL);
    zs->zsl = zslCreate();
    return createObject(REDIS_ZSET,zs);
}

void freeStringObject(robj *o) {
    if (o->encoding == REDIS_ENCODING_RAW) {
        sdsfree(o->ptr);
    }
}

void freeListObject(robj *o) {
    switch (o->encoding) {
    case REDIS_ENCODING_LINKEDLIST:
        listRelease((list*) o->ptr);
        break;
    case REDIS_ENCODING_ZIPLIST:
        zfree(o->ptr);
        break;
    default:
        redisPanic("Unknown list encoding type");
    }
}

void freeSetObject(robj *o) {
    switch (o->encoding) {
    case REDIS_ENCODING_HT:
        dictRelease((dict*) o->ptr);
        break;
    case REDIS_ENCODING_INTSET:
        zfree(o->ptr);
        break;
    default:
        redisPanic("Unknown set encoding type");
    }
}

void freeZsetObject(robj *o) {
    zset *zs = o->ptr;

    dictRelease(zs->dict);
    zslFree(zs->zsl);
    zfree(zs);
}

void freeHashObject(robj *o) {
    switch (o->encoding) {
    case REDIS_ENCODING_HT:
        dictRelease((dict*) o->ptr);
        break;
    case REDIS_ENCODING_ZIPMAP:
        zfree(o->ptr);
        break;
    default:
        redisPanic("Unknown hash encoding type");
        break;
    }
}

void incrRefCount(robj *o) {
    o->refcount++;
}

void decrRefCount(void *obj) {
    robj *o = obj;

    if (o->refcount <= 0) redisPanic("decrRefCount against refcount <= 0");
    if (--(o->refcount) == 0) {
        /* DS_SAVING objects should always have a reference in the
         * IO Job structure. So we should never reach this state. */
        redisAssert(o->storage != REDIS_DS_SAVING);
        switch(o->type) {
        case REDIS_STRING: freeStringObject(o); break;
        case REDIS_LIST: freeListObject(o); break;
        case REDIS_SET: freeSetObject(o); break;
        case REDIS_ZSET: freeZsetObject(o); break;
        case REDIS_HASH: freeHashObject(o); break;
        default: redisPanic("Unknown object type"); break;
        }
        o->ptr = NULL; /* defensive programming. We'll see NULL in traces. */
        zfree(o);
    }
}

int checkType(redisClient *c, robj *o, int type) {
    if (o->type != type) {
        addReply(c,shared.wrongtypeerr);
        return 1;
    }
    return 0;
}

/* Try to encode a string object in order to save space */
robj *tryObjectEncoding(robj *o) {
    long value;
    sds s = o->ptr;

    if (o->encoding != REDIS_ENCODING_RAW)
        return o; /* Already encoded */

    /* It's not safe to encode shared objects: shared objects can be shared
     * everywhere in the "object space" of Redis. Encoded objects can only
     * appear as "values" (and not, for instance, as keys) */
     if (o->refcount > 1) return o;

    /* Currently we try to encode only strings */
    redisAssert(o->type == REDIS_STRING);

    /* Check if we can represent this string as a long integer */
    if (isStringRepresentableAsLong(s,&value) == REDIS_ERR) return o;

    /* Ok, this object can be encoded...
     *
     * Can I use a shared object? Only if the object is inside a given
     * range and if the back end in use is in-memory. For disk store every
     * object in memory used as value should be independent.
     *
     * Note that we also avoid using shared integers when maxmemory is used
     * because every object needs to have a private LRU field for the LRU
     * algorithm to work well. */
    if (!server.ds_enabled &&
        server.maxmemory == 0 && value >= 0 && value < REDIS_SHARED_INTEGERS &&
        pthread_equal(pthread_self(),server.mainthread))
    {
        decrRefCount(o);
        incrRefCount(shared.integers[value]);
        return shared.integers[value];
    } else {
        o->encoding = REDIS_ENCODING_INT;
        sdsfree(o->ptr);
        o->ptr = (void*) value;
        return o;
    }
}

/* Get a decoded version of an encoded object (returned as a new object).
 * If the object is already raw-encoded just increment the ref count. */
robj *getDecodedObject(robj *o) {
    robj *dec;

    if (o->encoding == REDIS_ENCODING_RAW) {
        incrRefCount(o);
        return o;
    }
    if (o->type == REDIS_STRING && o->encoding == REDIS_ENCODING_INT) {
        char buf[32];

        ll2string(buf,32,(long)o->ptr);
        dec = createStringObject(buf,strlen(buf));
        return dec;
    } else {
        redisPanic("Unknown encoding type");
    }
}

/* Compare two string objects via strcmp() or alike.
 * Note that the objects may be integer-encoded. In such a case we
 * use ll2string() to get a string representation of the numbers on the stack
 * and compare the strings, it's much faster than calling getDecodedObject().
 *
 * Important note: if objects are not integer encoded, but binary-safe strings,
 * sdscmp() from sds.c will apply memcmp() so this function ca be considered
 * binary safe. */
int compareStringObjects(robj *a, robj *b) {
    redisAssert(a->type == REDIS_STRING && b->type == REDIS_STRING);
    char bufa[128], bufb[128], *astr, *bstr;
    int bothsds = 1;

    if (a == b) return 0;
    if (a->encoding != REDIS_ENCODING_RAW) {
        ll2string(bufa,sizeof(bufa),(long) a->ptr);
        astr = bufa;
        bothsds = 0;
    } else {
        astr = a->ptr;
    }
    if (b->encoding != REDIS_ENCODING_RAW) {
        ll2string(bufb,sizeof(bufb),(long) b->ptr);
        bstr = bufb;
        bothsds = 0;
    } else {
        bstr = b->ptr;
    }
    return bothsds ? sdscmp(astr,bstr) : strcmp(astr,bstr);
}

/* Equal string objects return 1 if the two objects are the same from the
 * point of view of a string comparison, otherwise 0 is returned. Note that
 * this function is faster then checking for (compareStringObject(a,b) == 0)
 * because it can perform some more optimization. */
int equalStringObjects(robj *a, robj *b) {
    if (a->encoding != REDIS_ENCODING_RAW && b->encoding != REDIS_ENCODING_RAW){
        return a->ptr == b->ptr;
    } else {
        return compareStringObjects(a,b) == 0;
    }
}

size_t stringObjectLen(robj *o) {
    redisAssert(o->type == REDIS_STRING);
    if (o->encoding == REDIS_ENCODING_RAW) {
        return sdslen(o->ptr);
    } else {
        char buf[32];

        return ll2string(buf,32,(long)o->ptr);
    }
}

int getDoubleFromObject(robj *o, double *target) {
    double value;
    char *eptr;

    if (o == NULL) {
        value = 0;
    } else {
        redisAssert(o->type == REDIS_STRING);
        if (o->encoding == REDIS_ENCODING_RAW) {
            value = strtod(o->ptr, &eptr);
            if (eptr[0] != '\0' || isnan(value)) return REDIS_ERR;
        } else if (o->encoding == REDIS_ENCODING_INT) {
            value = (long)o->ptr;
        } else {
            redisPanic("Unknown string encoding");
        }
    }

    *target = value;
    return REDIS_OK;
}

int getDoubleFromObjectOrReply(redisClient *c, robj *o, double *target, const char *msg) {
    double value;
    if (getDoubleFromObject(o, &value) != REDIS_OK) {
        if (msg != NULL) {
            addReplyError(c,(char*)msg);
        } else {
            addReplyError(c,"value is not a double");
        }
        return REDIS_ERR;
    }

    *target = value;
    return REDIS_OK;
}

int getLongLongFromObject(robj *o, long long *target) {
    long long value;
    char *eptr;

    if (o == NULL) {
        value = 0;
    } else {
        redisAssert(o->type == REDIS_STRING);
        if (o->encoding == REDIS_ENCODING_RAW) {
            value = strtoll(o->ptr, &eptr, 10);
            if (eptr[0] != '\0') return REDIS_ERR;
            if (errno == ERANGE && (value == LLONG_MIN || value == LLONG_MAX))
                return REDIS_ERR;
        } else if (o->encoding == REDIS_ENCODING_INT) {
            value = (long)o->ptr;
        } else {
            redisPanic("Unknown string encoding");
        }
    }

    if (target) *target = value;
    return REDIS_OK;
}

int getLongLongFromObjectOrReply(redisClient *c, robj *o, long long *target, const char *msg) {
    long long value;
    if (getLongLongFromObject(o, &value) != REDIS_OK) {
        if (msg != NULL) {
            addReplyError(c,(char*)msg);
        } else {
            addReplyError(c,"value is not an integer or out of range");
        }
        return REDIS_ERR;
    }

    *target = value;
    return REDIS_OK;
}

int getLongFromObjectOrReply(redisClient *c, robj *o, long *target, const char *msg) {
    long long value;

    if (getLongLongFromObjectOrReply(c, o, &value, msg) != REDIS_OK) return REDIS_ERR;
    if (value < LONG_MIN || value > LONG_MAX) {
        if (msg != NULL) {
            addReplyError(c,(char*)msg);
        } else {
            addReplyError(c,"value is out of range");
        }
        return REDIS_ERR;
    }

    *target = value;
    return REDIS_OK;
}

char *strEncoding(int encoding) {
    switch(encoding) {
    case REDIS_ENCODING_RAW: return "raw";
    case REDIS_ENCODING_INT: return "int";
    case REDIS_ENCODING_HT: return "hashtable";
    case REDIS_ENCODING_ZIPMAP: return "zipmap";
    case REDIS_ENCODING_LINKEDLIST: return "linkedlist";
    case REDIS_ENCODING_ZIPLIST: return "ziplist";
    case REDIS_ENCODING_INTSET: return "intset";
    default: return "unknown";
    }
}

/* Given an object returns the min number of seconds the object was never
 * requested, using an approximated LRU algorithm. */
unsigned long estimateObjectIdleTime(robj *o) {
    if (server.lruclock >= o->lru) {
        return (server.lruclock - o->lru) * REDIS_LRU_CLOCK_RESOLUTION;
    } else {
        return ((REDIS_LRU_CLOCK_MAX - o->lru) + server.lruclock) *
                    REDIS_LRU_CLOCK_RESOLUTION;
    }
}
Commit	Line	Data
e2641e09	1	#include "redis.h"
e2641e09	2	#include <pthread.h>
673e1fb7	3	#include <math.h>
e2641e09	4
e2641e09	5	robj createObject(int type, void ptr) {
a9b18e54	6	robj o = zmalloc(sizeof(o));
e2641e09	7	o->type = type;
	8	o->encoding = REDIS_ENCODING_RAW;
	9	o->ptr = ptr;
	10	o->refcount = 1;
a9b18e54	11
ef59a8bc	12	/* Set the LRU to the current lruclock (minutes resolution).
	13	* We do this regardless of the fact VM is active as LRU is also
	14	* used for the maxmemory directive when Redis is used as cache.
	15	*
	16	* Note that this code may run in the context of an I/O thread
	17	* and accessing server.lruclock in theory is an error
	18	* (no locks). But in practice this is safe, and even if we read
	19	* garbage Redis will not fail. */
	20	o->lru = server.lruclock;
	21	/* The following is only needed if VM is active, but since the conditional
	22	* is probably more costly than initializing the field it's better to
	23	* have every field properly initialized anyway. */
16d77878	24	o->storage = REDIS_DS_MEMORY;
e2641e09	25	return o;
	26	}
	27
	28	robj createStringObject(char ptr, size_t len) {
	29	return createObject(REDIS_STRING,sdsnewlen(ptr,len));
	30	}
	31
	32	robj *createStringObjectFromLongLong(long long value) {
	33	robj *o;
e002ec68	34	if (value >= 0 && value < REDIS_SHARED_INTEGERS &&
98a9abb6	35	!server.ds_enabled &&
e002ec68	36	pthread_equal(pthread_self(),server.mainthread)) {
e2641e09	37	incrRefCount(shared.integers[value]);
	38	o = shared.integers[value];
	39	} else {
	40	if (value >= LONG_MIN && value <= LONG_MAX) {
	41	o = createObject(REDIS_STRING, NULL);
	42	o->encoding = REDIS_ENCODING_INT;
	43	o->ptr = (void*)((long)value);
	44	} else {
	45	o = createObject(REDIS_STRING,sdsfromlonglong(value));
	46	}
	47	}
	48	return o;
	49	}
	50
	51	robj dupStringObject(robj o) {
	52	redisAssert(o->encoding == REDIS_ENCODING_RAW);
	53	return createStringObject(o->ptr,sdslen(o->ptr));
	54	}
	55
	56	robj *createListObject(void) {
	57	list *l = listCreate();
	58	robj *o = createObject(REDIS_LIST,l);
	59	listSetFreeMethod(l,decrRefCount);
	60	o->encoding = REDIS_ENCODING_LINKEDLIST;
	61	return o;
	62	}
	63
	64	robj *createZiplistObject(void) {
	65	unsigned char *zl = ziplistNew();
	66	robj *o = createObject(REDIS_LIST,zl);
	67	o->encoding = REDIS_ENCODING_ZIPLIST;
	68	return o;
	69	}
	70
	71	robj *createSetObject(void) {
	72	dict *d = dictCreate(&setDictType,NULL);
96ffb2fe PN	73	robj *o = createObject(REDIS_SET,d);
	74	o->encoding = REDIS_ENCODING_HT;
	75	return o;
	76	}
	77
	78	robj *createIntsetObject(void) {
	79	intset *is = intsetNew();
	80	robj *o = createObject(REDIS_SET,is);
	81	o->encoding = REDIS_ENCODING_INTSET;
	82	return o;
e2641e09	83	}
	84
	85	robj *createHashObject(void) {
	86	/* All the Hashes start as zipmaps. Will be automatically converted
	87	* into hash tables if there are enough elements or big elements
	88	* inside. */
	89	unsigned char *zm = zipmapNew();
	90	robj *o = createObject(REDIS_HASH,zm);
	91	o->encoding = REDIS_ENCODING_ZIPMAP;
	92	return o;
	93	}
	94
	95	robj *createZsetObject(void) {
	96	zset zs = zmalloc(sizeof(zs));
	97
	98	zs->dict = dictCreate(&zsetDictType,NULL);
	99	zs->zsl = zslCreate();
	100	return createObject(REDIS_ZSET,zs);
	101	}
	102
	103	void freeStringObject(robj *o) {
	104	if (o->encoding == REDIS_ENCODING_RAW) {
	105	sdsfree(o->ptr);
	106	}
	107	}
	108
	109	void freeListObject(robj *o) {
	110	switch (o->encoding) {
	111	case REDIS_ENCODING_LINKEDLIST:
	112	listRelease((list*) o->ptr);
	113	break;
	114	case REDIS_ENCODING_ZIPLIST:
	115	zfree(o->ptr);
	116	break;
	117	default:
	118	redisPanic("Unknown list encoding type");
	119	}
	120	}
	121
	122	void freeSetObject(robj *o) {
96ffb2fe PN	123	switch (o->encoding) {
	124	case REDIS_ENCODING_HT:
	125	dictRelease((dict*) o->ptr);
	126	break;
	127	case REDIS_ENCODING_INTSET:
	128	zfree(o->ptr);
	129	break;
	130	default:
	131	redisPanic("Unknown set encoding type");
	132	}
e2641e09	133	}
	134
	135	void freeZsetObject(robj *o) {
	136	zset *zs = o->ptr;
	137
	138	dictRelease(zs->dict);
	139	zslFree(zs->zsl);
	140	zfree(zs);
	141	}
	142
	143	void freeHashObject(robj *o) {
	144	switch (o->encoding) {
	145	case REDIS_ENCODING_HT:
	146	dictRelease((dict*) o->ptr);
	147	break;
	148	case REDIS_ENCODING_ZIPMAP:
	149	zfree(o->ptr);
	150	break;
	151	default:
	152	redisPanic("Unknown hash encoding type");
	153	break;
	154	}
	155	}
	156
	157	void incrRefCount(robj *o) {
	158	o->refcount++;
	159	}
	160
	161	void decrRefCount(void *obj) {
	162	robj *o = obj;
	163
e2641e09	164	if (o->refcount <= 0) redisPanic("decrRefCount against refcount <= 0");
e2641e09	165	if (--(o->refcount) == 0) {
16d77878	166	/* DS_SAVING objects should always have a reference in the
	167	* IO Job structure. So we should never reach this state. */
	168	redisAssert(o->storage != REDIS_DS_SAVING);
e2641e09	169	switch(o->type) {
	170	case REDIS_STRING: freeStringObject(o); break;
	171	case REDIS_LIST: freeListObject(o); break;
	172	case REDIS_SET: freeSetObject(o); break;
	173	case REDIS_ZSET: freeZsetObject(o); break;
	174	case REDIS_HASH: freeHashObject(o); break;
	175	default: redisPanic("Unknown object type"); break;
	176	}
2f996f02	177	o->ptr = NULL; /* defensive programming. We'll see NULL in traces. */
a9b18e54	178	zfree(o);
e2641e09	179	}
	180	}
	181
	182	int checkType(redisClient c, robj o, int type) {
	183	if (o->type != type) {
	184	addReply(c,shared.wrongtypeerr);
	185	return 1;
	186	}
	187	return 0;
	188	}
	189
	190	/* Try to encode a string object in order to save space */
	191	robj tryObjectEncoding(robj o) {
	192	long value;
	193	sds s = o->ptr;
	194
	195	if (o->encoding != REDIS_ENCODING_RAW)
	196	return o; /* Already encoded */
	197
	198	/* It's not safe to encode shared objects: shared objects can be shared
	199	* everywhere in the "object space" of Redis. Encoded objects can only
	200	* appear as "values" (and not, for instance, as keys) */
	201	if (o->refcount > 1) return o;
	202
	203	/* Currently we try to encode only strings */
	204	redisAssert(o->type == REDIS_STRING);
	205
	206	/* Check if we can represent this string as a long integer */
	207	if (isStringRepresentableAsLong(s,&value) == REDIS_ERR) return o;
	208
0e5441d8	209	/* Ok, this object can be encoded...
	210	*
	211	* Can I use a shared object? Only if the object is inside a given
cea8c5cd	212	* range and if the back end in use is in-memory. For disk store every
cea8c5cd	213	* object in memory used as value should be independent.
13a49af4	214	*
13a49af4	215	* Note that we also avoid using shared integers when maxmemory is used
cea8c5cd	216	* because every object needs to have a private LRU field for the LRU
13a49af4	217	* algorithm to work well. */
98a9abb6	218	if (!server.ds_enabled &&
cea8c5cd	219	server.maxmemory == 0 && value >= 0 && value < REDIS_SHARED_INTEGERS &&
	220	pthread_equal(pthread_self(),server.mainthread))
	221	{
e2641e09	222	decrRefCount(o);
	223	incrRefCount(shared.integers[value]);
	224	return shared.integers[value];
	225	} else {
	226	o->encoding = REDIS_ENCODING_INT;
	227	sdsfree(o->ptr);
	228	o->ptr = (void*) value;
	229	return o;
	230	}
	231	}
	232
	233	/* Get a decoded version of an encoded object (returned as a new object).
	234	* If the object is already raw-encoded just increment the ref count. */
	235	robj getDecodedObject(robj o) {
	236	robj *dec;
	237
	238	if (o->encoding == REDIS_ENCODING_RAW) {
	239	incrRefCount(o);
	240	return o;
	241	}
	242	if (o->type == REDIS_STRING && o->encoding == REDIS_ENCODING_INT) {
	243	char buf[32];
	244
	245	ll2string(buf,32,(long)o->ptr);
	246	dec = createStringObject(buf,strlen(buf));
	247	return dec;
	248	} else {
	249	redisPanic("Unknown encoding type");
	250	}
	251	}
	252
	253	/* Compare two string objects via strcmp() or alike.
	254	* Note that the objects may be integer-encoded. In such a case we
	255	* use ll2string() to get a string representation of the numbers on the stack
	256	* and compare the strings, it's much faster than calling getDecodedObject().
	257	*
	258	* Important note: if objects are not integer encoded, but binary-safe strings,
	259	* sdscmp() from sds.c will apply memcmp() so this function ca be considered
	260	* binary safe. */
	261	int compareStringObjects(robj a, robj b) {
	262	redisAssert(a->type == REDIS_STRING && b->type == REDIS_STRING);
	263	char bufa[128], bufb[128], astr, bstr;
	264	int bothsds = 1;
	265
	266	if (a == b) return 0;
	267	if (a->encoding != REDIS_ENCODING_RAW) {
	268	ll2string(bufa,sizeof(bufa),(long) a->ptr);
	269	astr = bufa;
	270	bothsds = 0;
	271	} else {
	272	astr = a->ptr;
	273	}
	274	if (b->encoding != REDIS_ENCODING_RAW) {
	275	ll2string(bufb,sizeof(bufb),(long) b->ptr);
	276	bstr = bufb;
	277	bothsds = 0;
	278	} else {
	279	bstr = b->ptr;
	280	}
	281	return bothsds ? sdscmp(astr,bstr) : strcmp(astr,bstr);
	282	}
	283
	284	/* Equal string objects return 1 if the two objects are the same from the
	285	* point of view of a string comparison, otherwise 0 is returned. Note that
286	* this function is faster then checking for (compareStringObject(a,b) == 0)
287	* because it can perform some more optimization. */
288	int equalStringObjects(robj a, robj b) {
289	if (a->encoding != REDIS_ENCODING_RAW && b->encoding != REDIS_ENCODING_RAW){
290	return a->ptr == b->ptr;
291	} else {
292	return compareStringObjects(a,b) == 0;
293	}
294	}
295
296	size_t stringObjectLen(robj *o) {
297	redisAssert(o->type == REDIS_STRING);
298	if (o->encoding == REDIS_ENCODING_RAW) {
299	return sdslen(o->ptr);
300	} else {
301	char buf[32];
302
303	return ll2string(buf,32,(long)o->ptr);
304	}
305	}
306
307	int getDoubleFromObject(robj o, double target) {
308	double value;
309	char *eptr;
310
311	if (o == NULL) {
312	value = 0;
313	} else {
314	redisAssert(o->type == REDIS_STRING);
315	if (o->encoding == REDIS_ENCODING_RAW) {
316	value = strtod(o->ptr, &eptr);
673e1fb7	317	if (eptr[0] != '\0' \|\| isnan(value)) return REDIS_ERR;
e2641e09	318	} else if (o->encoding == REDIS_ENCODING_INT) {
	319	value = (long)o->ptr;
	320	} else {
	321	redisPanic("Unknown string encoding");
	322	}
	323	}
	324
	325	*target = value;
	326	return REDIS_OK;
	327	}
	328
	329	int getDoubleFromObjectOrReply(redisClient c, robj o, double target, const char msg) {
	330	double value;
	331	if (getDoubleFromObject(o, &value) != REDIS_OK) {
	332	if (msg != NULL) {
3ab20376	333	addReplyError(c,(char*)msg);
e2641e09	334	} else {
3ab20376	335	addReplyError(c,"value is not a double");
e2641e09	336	}
	337	return REDIS_ERR;
	338	}
	339
	340	*target = value;
	341	return REDIS_OK;
	342	}
	343
	344	int getLongLongFromObject(robj o, long long target) {
	345	long long value;
	346	char *eptr;
	347
	348	if (o == NULL) {
	349	value = 0;
	350	} else {
	351	redisAssert(o->type == REDIS_STRING);
	352	if (o->encoding == REDIS_ENCODING_RAW) {
	353	value = strtoll(o->ptr, &eptr, 10);
	354	if (eptr[0] != '\0') return REDIS_ERR;
c91abdcd	355	if (errno == ERANGE && (value == LLONG_MIN \|\| value == LLONG_MAX))
c91abdcd	356	return REDIS_ERR;
e2641e09	357	} else if (o->encoding == REDIS_ENCODING_INT) {
	358	value = (long)o->ptr;
	359	} else {
	360	redisPanic("Unknown string encoding");
	361	}
	362	}
	363
96ffb2fe	364	if (target) *target = value;
e2641e09	365	return REDIS_OK;
	366	}
	367
	368	int getLongLongFromObjectOrReply(redisClient c, robj o, long long target, const char msg) {
	369	long long value;
	370	if (getLongLongFromObject(o, &value) != REDIS_OK) {
	371	if (msg != NULL) {
3ab20376	372	addReplyError(c,(char*)msg);
e2641e09	373	} else {
3ab20376	374	addReplyError(c,"value is not an integer or out of range");
e2641e09	375	}
	376	return REDIS_ERR;
	377	}
	378
	379	*target = value;
	380	return REDIS_OK;
	381	}
	382
	383	int getLongFromObjectOrReply(redisClient c, robj o, long target, const char msg) {
	384	long long value;
	385
	386	if (getLongLongFromObjectOrReply(c, o, &value, msg) != REDIS_OK) return REDIS_ERR;
	387	if (value < LONG_MIN \|\| value > LONG_MAX) {
	388	if (msg != NULL) {
3ab20376	389	addReplyError(c,(char*)msg);
e2641e09	390	} else {
3ab20376	391	addReplyError(c,"value is out of range");
e2641e09	392	}
	393	return REDIS_ERR;
	394	}
	395
	396	*target = value;
	397	return REDIS_OK;
	398	}
	399
	400	char *strEncoding(int encoding) {
	401	switch(encoding) {
	402	case REDIS_ENCODING_RAW: return "raw";
	403	case REDIS_ENCODING_INT: return "int";
	404	case REDIS_ENCODING_HT: return "hashtable";
	405	case REDIS_ENCODING_ZIPMAP: return "zipmap";
	406	case REDIS_ENCODING_LINKEDLIST: return "linkedlist";
	407	case REDIS_ENCODING_ZIPLIST: return "ziplist";
96ffb2fe	408	case REDIS_ENCODING_INTSET: return "intset";
e2641e09	409	default: return "unknown";
	410	}
	411	}
ef59a8bc	412
	413	/* Given an object returns the min number of seconds the object was never
	414	* requested, using an approximated LRU algorithm. */
	415	unsigned long estimateObjectIdleTime(robj *o) {
	416	if (server.lruclock >= o->lru) {
165346ca	417	return (server.lruclock - o->lru) * REDIS_LRU_CLOCK_RESOLUTION;
ef59a8bc	418	} else {
165346ca	419	return ((REDIS_LRU_CLOCK_MAX - o->lru) + server.lruclock) *
165346ca	420	REDIS_LRU_CLOCK_RESOLUTION;
ef59a8bc	421	}
ef59a8bc	422	}