mirror of
https://github.com/fluencelabs/redis
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zipmaps functions to get, iterate, test for existence. Initial works for Hash data type
This commit is contained in:
antirez
parent
b1ad58ed2f
commit
5234952bee
5
Makefile
5
Makefile
@ -14,7 +14,7 @@ endif
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CCOPT= $(CFLAGS) $(CCLINK) $(ARCH) $(PROF)
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DEBUG?= -g -rdynamic -ggdb
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OBJ = adlist.o ae.o anet.o dict.o redis.o sds.o zmalloc.o lzf_c.o lzf_d.o pqsort.o
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OBJ = adlist.o ae.o anet.o dict.o redis.o sds.o zmalloc.o lzf_c.o lzf_d.o pqsort.o zipmap.o
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BENCHOBJ = ae.o anet.o redis-benchmark.o sds.o adlist.o zmalloc.o
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CLIOBJ = anet.o sds.o adlist.o redis-cli.o zmalloc.o
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@ -39,8 +39,9 @@ redis-benchmark.o: redis-benchmark.c fmacros.h ae.h anet.h sds.h adlist.h \
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zmalloc.h
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redis-cli.o: redis-cli.c fmacros.h anet.h sds.h adlist.h zmalloc.h
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redis.o: redis.c fmacros.h config.h redis.h ae.h sds.h anet.h dict.h \
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adlist.h zmalloc.h lzf.h pqsort.h staticsymbols.h
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adlist.h zmalloc.h lzf.h pqsort.h zipmap.h staticsymbols.h
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sds.o: sds.c sds.h zmalloc.h
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zipmap.o: zipmap.c zmalloc.h
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zmalloc.o: zmalloc.c config.h
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redis-server: $(OBJ)
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31
redis.c
31
redis.c
@ -75,6 +75,7 @@
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#include "zmalloc.h" /* total memory usage aware version of malloc/free */
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#include "lzf.h" /* LZF compression library */
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#include "pqsort.h" /* Partial qsort for SORT+LIMIT */
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#include "zipmap.h"
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/* Error codes */
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#define REDIS_OK 0
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@ -118,9 +119,13 @@
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#define REDIS_ZSET 3
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#define REDIS_HASH 4
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/* Objects encoding */
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/* Objects encoding. Some kind of objects like Strings and Hashes can be
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* internally represented in multiple ways. The 'encoding' field of the object
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* is set to one of this fields for this object. */
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#define REDIS_ENCODING_RAW 0 /* Raw representation */
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#define REDIS_ENCODING_INT 1 /* Encoded as integer */
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#define REDIS_ENCODING_ZIPMAP 2 /* Encoded as zipmap */
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#define REDIS_ENCODING_HT 3 /* Encoded as an hash table */
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/* Object types only used for dumping to disk */
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#define REDIS_EXPIRETIME 253
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@ -1011,7 +1016,7 @@ static dictType zsetDictType = {
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};
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/* Db->dict */
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static dictType hashDictType = {
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static dictType dbDictType = {
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dictObjHash, /* hash function */
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NULL, /* key dup */
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NULL, /* val dup */
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@ -1030,6 +1035,16 @@ static dictType keyptrDictType = {
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NULL /* val destructor */
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};
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/* Hash type hash table (note that small hashes are represented with zimpaps) */
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static dictType hashDictType = {
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dictEncObjHash, /* hash function */
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NULL, /* key dup */
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NULL, /* val dup */
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dictEncObjKeyCompare, /* key compare */
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dictRedisObjectDestructor, /* key destructor */
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dictRedisObjectDestructor /* val destructor */
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};
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/* Keylist hash table type has unencoded redis objects as keys and
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* lists as values. It's used for blocking operations (BLPOP) and to
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* map swapped keys to a list of clients waiting for this keys to be loaded. */
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@ -1493,7 +1508,7 @@ static void initServer() {
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exit(1);
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}
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for (j = 0; j < server.dbnum; j++) {
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server.db[j].dict = dictCreate(&hashDictType,NULL);
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server.db[j].dict = dictCreate(&dbDictType,NULL);
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server.db[j].expires = dictCreate(&keyptrDictType,NULL);
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server.db[j].blockingkeys = dictCreate(&keylistDictType,NULL);
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if (server.vm_enabled)
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@ -2543,6 +2558,16 @@ static robj *createSetObject(void) {
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return createObject(REDIS_SET,d);
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}
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static robj *createHashObject(void) {
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/* All the Hashes start as zipmaps. Will be automatically converted
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* into hash tables if there are enough elements or big elements
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* inside. */
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unsigned char *zm = zipmapNew();
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robj *o = createObject(REDIS_HASH,zm);
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o->encoding = REDIS_ENCODING_ZIPMAP;
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return o;
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}
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static robj *createZsetObject(void) {
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zset *zs = zmalloc(sizeof(*zs));
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78
zipmap.c
78
zipmap.c
@ -97,6 +97,11 @@
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* comments above, that is, the max number of trailing bytes in a value. */
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#define ZIPMAP_VALUE_MAX_FREE 5
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/* The following macro returns the number of bytes needed to encode the length
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* for the integer value _l, that is, 1 byte for lengths < ZIPMAP_BIGLEN and
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* 5 bytes for all the other lengths. */
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#define ZIPMAP_LEN_BYTES(_l) (((_l) < ZIPMAP_BIGLEN) ? 1 : sizeof(unsigned int)+1)
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/* Create a new empty zipmap. */
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unsigned char *zipmapNew(void) {
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unsigned char *zm = zmalloc(2);
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@ -119,7 +124,7 @@ static unsigned int zipmapDecodeLength(unsigned char *p) {
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* the amount of bytes required to encode such a length. */
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static unsigned int zipmapEncodeLength(unsigned char *p, unsigned int len) {
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if (p == NULL) {
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return (len < ZIPMAP_BIGLEN) ? 1 : 1+sizeof(unsigned int);
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return ZIPMAP_LEN_BYTES(len);
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} else {
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if (len < ZIPMAP_BIGLEN) {
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p[0] = len;
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@ -219,23 +224,24 @@ static unsigned int zipmapRawEntryLength(unsigned char *p) {
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return l + zipmapRawValueLength(p+l);
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}
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/* Set key to value, creating the key if it does not already exist. */
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unsigned char *zipmapSet(unsigned char *zm, unsigned char *key, unsigned int klen, unsigned char *val, unsigned int vlen) {
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/* Set key to value, creating the key if it does not already exist.
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* If 'update' is not NULL, *update is set to 1 if the key was
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* already preset, otherwise to 0. */
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unsigned char *zipmapSet(unsigned char *zm, unsigned char *key, unsigned int klen, unsigned char *val, unsigned int vlen, int *update) {
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unsigned int oldlen = 0, freeoff = 0, freelen;
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unsigned int reqlen = zipmapRequiredLength(klen,vlen);
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unsigned int empty, vempty;
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unsigned char *p;
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freelen = reqlen;
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if (update) *update = 0;
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p = zipmapLookupRaw(zm,key,klen,&oldlen,&freeoff,&freelen);
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if (p == NULL && freelen == 0) {
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printf("HERE oldlen:%u required:%u\n",oldlen,reqlen);
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/* Key not found, and not space for the new key. Enlarge */
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zm = zrealloc(zm,oldlen+reqlen);
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p = zm+oldlen-1;
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zm[oldlen+reqlen-1] = ZIPMAP_END;
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freelen = reqlen;
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printf("New total length is: %u\n", oldlen+reqlen);
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} else if (p == NULL) {
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/* Key not found, but there is enough free space. */
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p = zm+freeoff;
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@ -245,6 +251,7 @@ unsigned char *zipmapSet(unsigned char *zm, unsigned char *key, unsigned int kle
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/* Key found. Is there enough space for the new value? */
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/* Compute the total length: */
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if (update) *update = 1;
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freelen = zipmapRawKeyLength(b);
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b += freelen;
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freelen += zipmapRawValueLength(b);
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@ -253,7 +260,7 @@ unsigned char *zipmapSet(unsigned char *zm, unsigned char *key, unsigned int kle
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p[0] = ZIPMAP_EMPTY;
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zipmapEncodeLength(p+1,freelen);
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zm[0] |= ZIPMAP_STATUS_FRAGMENTED;
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return zipmapSet(zm,key,klen,val,vlen);
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return zipmapSet(zm,key,klen,val,vlen,NULL);
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}
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}
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@ -304,37 +311,58 @@ unsigned char *zipmapDel(unsigned char *zm, unsigned char *key, unsigned int kle
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return zm;
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}
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/* Call it before to iterate trought elements via zipmapNext() */
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unsigned char *zipmapRewind(unsigned char *zm) {
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return zm+1;
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}
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/* This function is used to iterate through all the zipmap elements.
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* In the first call the first argument is the pointer to the zipmap + 1.
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* In the next calls what zipmapNext returns is used as first argument.
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* Example:
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*
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* unsigned char *i = my_zipmap+1;
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* unsigned char *i = zipmapRewind(my_zipmap);
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* while((i = zipmapNext(i,&key,&klen,&value,&vlen)) != NULL) {
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* printf("%d bytes key at $p\n", klen, key);
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* printf("%d bytes value at $p\n", vlen, value);
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* }
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*/
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unsigned char *zipmapNext(unsigned char *zm, unsigned char **key,
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unsigned int *klen, unsigned char **value, unsigned int *vlen) {
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unsigned char *zipmapNext(unsigned char *zm, unsigned char **key, unsigned int *klen, unsigned char **value, unsigned int *vlen) {
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while(zm[0] == ZIPMAP_EMPTY)
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zm += zipmapDecodeLength(zm+1);
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if (zm[0] == ZIPMAP_END) return NULL;
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if (key) {
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*key = zm;
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*klen = zipmapDecodeLength(zm);
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*key += (*klen < ZIPMAP_BIGLEN) ? 1 : sizeof(unsigned int);
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*key += ZIPMAP_LEN_BYTES(*klen);
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}
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zm += zipmapRawKeyLength(zm);
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if (value) {
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*value = zm+1;
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*vlen = zipmapDecodeLength(zm);
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*value += (*vlen < ZIPMAP_BIGLEN) ? 1 : sizeof(unsigned int);
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*value += ZIPMAP_LEN_BYTES(*vlen);
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}
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zm += zipmapRawValueLength(zm);
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return zm;
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}
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/* Search a key and retrieve the pointer and len of the associated value.
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* If the key is found the function returns 1, otherwise 0. */
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int zipmapGet(unsigned char *zm, unsigned char *key, unsigned int klen, unsigned char **value, unsigned int *vlen) {
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unsigned char *p;
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if ((p = zipmapLookupRaw(zm,key,klen,NULL,NULL,NULL)) == NULL) return 0;
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p += zipmapRawKeyLength(p);
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*vlen = zipmapDecodeLength(p);
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*value = p + ZIPMAP_LEN_BYTES(*vlen) + 1;
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return 1;
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}
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/* Return 1 if the key exists, otherwise 0 is returned. */
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int zipmapExists(unsigned char *zm, unsigned char *key, unsigned int klen) {
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return zipmapLookupRaw(zm,key,klen,NULL,NULL,NULL) != NULL;
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}
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void zipmapRepr(unsigned char *p) {
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unsigned int l;
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@ -372,29 +400,41 @@ void zipmapRepr(unsigned char *p) {
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printf("\n");
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}
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#ifdef ZIPMAP_TEST_MAIN
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int main(void) {
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unsigned char *zm;
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zm = zipmapNew();
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zm = zipmapSet(zm,(unsigned char*) "hello",5, (unsigned char*) "world!",6);
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zm = zipmapSet(zm,(unsigned char*) "foo",3, (unsigned char*) "bar",3);
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zm = zipmapSet(zm,(unsigned char*) "foo",3, (unsigned char*) "!",1);
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zm = zipmapSet(zm,(unsigned char*) "hello",5, (unsigned char*) "world!",6,NULL);
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zm = zipmapSet(zm,(unsigned char*) "foo",3, (unsigned char*) "bar",3,NULL);
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zm = zipmapSet(zm,(unsigned char*) "foo",3, (unsigned char*) "!",1,NULL);
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zipmapRepr(zm);
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zm = zipmapSet(zm,(unsigned char*) "foo",3, (unsigned char*) "12345",5);
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zm = zipmapSet(zm,(unsigned char*) "foo",3, (unsigned char*) "12345",5,NULL);
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zipmapRepr(zm);
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zm = zipmapSet(zm,(unsigned char*) "new",3, (unsigned char*) "xx",2);
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zm = zipmapSet(zm,(unsigned char*) "new",3, (unsigned char*) "xx",2,NULL);
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zipmapRepr(zm);
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zm = zipmapDel(zm,(unsigned char*) "new",3,NULL);
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zipmapRepr(zm);
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printf("Iterate trought elements:\n");
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printf("\nPerform a direct lookup:\n");
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{
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unsigned char *i = zm+1;
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unsigned char *value;
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unsigned int vlen;
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if (zipmapGet(zm,(unsigned char*) "foo",3,&value,&vlen)) {
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printf(" foo is associated to the %d bytes value: %.*s\n",
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vlen, vlen, value);
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}
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}
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printf("\nIterate trought elements:\n");
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{
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unsigned char *i = zipmapRewind(zm);
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unsigned char *key, *value;
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unsigned int klen, vlen;
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while((i = zipmapNext(i,&key,&klen,&value,&vlen)) != NULL) {
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printf("%d:%.*s => %d:%.*s\n", klen, klen, key, vlen, vlen, value);
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printf(" %d:%.*s => %d:%.*s\n", klen, klen, key, vlen, vlen, value);
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}
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}
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return 0;
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}
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#endif
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46
zipmap.h
Normal file
46
zipmap.h
Normal file
@ -0,0 +1,46 @@
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/* String -> String Map data structure optimized for size.
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*
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* See zipmap.c for more info.
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*
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* --------------------------------------------------------------------------
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*
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* Copyright (c) 2009-2010, Salvatore Sanfilippo <antirez at gmail dot com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Redis nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _ZIMMAP_H
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#define _ZIPMAP_H
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unsigned char *zipmapNew(void);
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unsigned char *zipmapSet(unsigned char *zm, unsigned char *key, unsigned int klen, unsigned char *val, unsigned int vlen, int *update);
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unsigned char *zipmapDel(unsigned char *zm, unsigned char *key, unsigned int klen, int *deleted);
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unsigned char *zipmapRewind(unsigned char *zm);
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unsigned char *zipmapNext(unsigned char *zm, unsigned char **key, unsigned int *klen, unsigned char **value, unsigned int *vlen);
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int zipmapGet(unsigned char *zm, unsigned char *key, unsigned int klen, unsigned char **value, unsigned int *vlen);
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int zipmapExists(unsigned char *zm, unsigned char *key, unsigned int klen);
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#endif
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