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small refactor of fwrite* commands for AOF rewrite to allow writing a bulk long long

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This commit is contained in:
Pieter Noordhuis 2010-05-31 23:41:04 +02:00
parent dc845730a9
commit 9eaef89fbc
2 changed files with 30 additions and 41 deletions
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69
redis.c
View File

@ -8730,40 +8730,17 @@ fmterr:
exit(1);
}
/* Write an object into a file in the bulk format $<count>\r\n<payload>\r\n */
static int fwriteBulkObject(FILE *fp, robj *obj) {
char buf[128];
int decrrc = 0;
/* Avoid the incr/decr ref count business if possible to help
* copy-on-write (we are often in a child process when this function
* is called).
* Also makes sure that key objects don't get incrRefCount-ed when VM
* is enabled */
if (obj->encoding != REDIS_ENCODING_RAW) {
obj = getDecodedObject(obj);
decrrc = 1;
}
snprintf(buf,sizeof(buf),"$%ld\r\n",(long)sdslen(obj->ptr));
if (fwrite(buf,strlen(buf),1,fp) == 0) goto err;
if (sdslen(obj->ptr) && fwrite(obj->ptr,sdslen(obj->ptr),1,fp) == 0)
goto err;
if (fwrite("\r\n",2,1,fp) == 0) goto err;
if (decrrc) decrRefCount(obj);
return 1;
err:
if (decrrc) decrRefCount(obj);
return 0;
}
/* Write binary-safe string into a file in the bulkformat
* $<count>\r\n<payload>\r\n */
static int fwriteBulkString(FILE *fp, char *s, unsigned long len) {
char buf[128];
snprintf(buf,sizeof(buf),"$%ld\r\n",(unsigned long)len);
if (fwrite(buf,strlen(buf),1,fp) == 0) return 0;
if (len && fwrite(s,len,1,fp) == 0) return 0;
char cbuf[128];
int clen;
cbuf[0] = '$';
clen = 1+ll2string(cbuf+1,sizeof(cbuf)-1,len);
cbuf[clen++] = '\r';
cbuf[clen++] = '\n';
if (fwrite(cbuf,clen,1,fp) == 0) return 0;
if (len > 0 && fwrite(s,len,1,fp) == 0) return 0;
if (fwrite("\r\n",2,1,fp) == 0) return 0;
return 1;
}
@ -8780,16 +8757,28 @@ static int fwriteBulkDouble(FILE *fp, double d) {
}
/* Write a long value in bulk format $<count>\r\n<payload>\r\n */
static int fwriteBulkLong(FILE *fp, long l) {
char buf[128], lbuf[128];
snprintf(lbuf,sizeof(lbuf),"%ld\r\n",l);
snprintf(buf,sizeof(buf),"$%lu\r\n",(unsigned long)strlen(lbuf)-2);
if (fwrite(buf,strlen(buf),1,fp) == 0) return 0;
if (fwrite(lbuf,strlen(lbuf),1,fp) == 0) return 0;
static int fwriteBulkLongLong(FILE *fp, long long l) {
char bbuf[128], lbuf[128];
unsigned int blen, llen;
llen = ll2string(lbuf,32,l);
blen = snprintf(bbuf,sizeof(bbuf),"$%u\r\n%s\r\n",llen,lbuf);
if (fwrite(bbuf,blen,1,fp) == 0) return 0;
return 1;
}
/* Delegate writing an object to writing a bulk string or bulk long long. */
static int fwriteBulkObject(FILE *fp, robj *obj) {
/* Avoid using getDecodedObject to help copy-on-write (we are often
* in a child process when this function is called). */
if (obj->encoding == REDIS_ENCODING_INT) {
return fwriteBulkLongLong(fp,(long)obj->ptr);
} else if (obj->encoding == REDIS_ENCODING_RAW) {
return fwriteBulkString(fp,obj->ptr,sdslen(obj->ptr));
} else {
redisPanic("Unknown string encoding");
}
}
/* Write a sequence of commands able to fully rebuild the dataset into
* "filename". Used both by REWRITEAOF and BGREWRITEAOF. */
static int rewriteAppendOnlyFile(char *filename) {
@ -8821,7 +8810,7 @@ static int rewriteAppendOnlyFile(char *filename) {
/* SELECT the new DB */
if (fwrite(selectcmd,sizeof(selectcmd)-1,1,fp) == 0) goto werr;
if (fwriteBulkLong(fp,j) == 0) goto werr;
if (fwriteBulkLongLong(fp,j) == 0) goto werr;
/* Iterate this DB writing every entry */
while((de = dictNext(di)) != NULL) {
@ -8941,7 +8930,7 @@ static int rewriteAppendOnlyFile(char *filename) {
if (expiretime < now) continue;
if (fwrite(cmd,sizeof(cmd)-1,1,fp) == 0) goto werr;
if (fwriteBulkObject(fp,key) == 0) goto werr;
if (fwriteBulkLong(fp,expiretime) == 0) goto werr;
if (fwriteBulkLongLong(fp,expiretime) == 0) goto werr;
}
if (swapped) decrRefCount(o);
}

2
staticsymbols.h
View File

@ -93,7 +93,7 @@ static struct redisFunctionSym symsTable[] = {
{"freeStringObject",(unsigned long)freeStringObject},
{"freeZsetObject",(unsigned long)freeZsetObject},
{"fwriteBulkDouble",(unsigned long)fwriteBulkDouble},
{"fwriteBulkLong",(unsigned long)fwriteBulkLong},
{"fwriteBulkLongLong",(unsigned long)fwriteBulkLongLong},
{"fwriteBulkObject",(unsigned long)fwriteBulkObject},
{"fwriteBulkString",(unsigned long)fwriteBulkString},
{"genRedisInfoString",(unsigned long)genRedisInfoString},