Redis 设计与实现 3：字符串 SDS

在 Redis 中，字符串都用自定义的结构简单动态字符串(Simple Dynamic Strings，SDS)。
Redis 中使用到的字符串都是用 SDS，例如 key、string 类型的值、sorted set 的 member、hash 的 field 等等等等。。。

数据结构
旧版本的结构
在 3.2 版本之前，sds 的定义是这样的：

struct sdshdr {
// buf 数组中已使用的字节数量，也就是 sds 本身的字符串长度
unsigned int len;
// buf 数组中未使用的字节数量
unsigned int free;
// 字节数组，用于保存字符串
char buf[];
};
旧版本 SDS 结构示例

这样的结构有几个好处：

单独记录长度len，获取字符串长度的时间复杂度是 O(1) 。传统的 C 字符串获取长度需要遍历字符串，直到遇到\0，时间复杂度是 O(N)。
buf 数组末尾遵循 C 字符串以 \0 结尾的惯例，可以兼容 C 处理字符串的函数。
减少修改字符串带来的内存重分配次数，Redis 使用了 空间预分配(预先申请大一点点的空间) 和 空间惰性释放(字符串变短修改len字段即可)来减少字符串修改引起的内存重新分配。
不以\0为结尾的判断，二进制安全。因为图片等二进制数据中，可能包含\0，传统 C 字符串一遇到 \0 就认为字符串结束了，会导致不能完整保存。
缺点：

len 和 free 的定义用了 4 个字节，可以表示 2^32 的长度。但是我们实际使用的字符串，往往没有那么长。4 个字节造成了浪费。
新版本的结构
旧版本中我们说到，len 和 free 的缺点是用了太长的变量，新版本解决了这个问题。
我们来看一下新版本的 SDS 结构。

在 Redis 3.2 版本之后，Redis 将 SDS 划分为 5 种类型：

类型 字节 位
sdshdr5 < 1 <8
sdshdr8 1 8
sdshdr16 2 16
sdshdr32 4 32
sdshdr64 8 64
新版本新增加了一个 flags 字段来标识类型，长度 1 字节(8 位)。
类型只占用了前 3 位。在 sdshdr5 中，后 5 位用来保存字符串的长度。其他类型后 5 位没有用。

struct attribute ((packed)) sdshdr5 {
unsigned char flags; /* 前 3 位保存类型，后 5 位保存字符串长度 /
char buf[];
};
struct attribute ((packed)) sdshdr8 {
uint8_t len; / 字符串长度，1 字节 8 位 /
uint8_t alloc; / 申请的总长度，1 字节 8 位 /
unsigned char flags; / 前 3 位保存类型，后 5 位未使用 /
char buf[];
};
struct attribute ((packed)) sdshdr16 {
uint16_t len; / 字符串长度，2 字节 16 位 /
uint16_t alloc; / 申请的总长度，2 字节 16 位 /
unsigned char flags; / 前 3 位保存类型，后 5 位未使用 /
char buf[];
};
struct attribute ((packed)) sdshdr32 {
uint32_t len; / 字符串长度，4 字节 32 位 /
uint32_t alloc; / 申请的总长度，4 字节 32 位 /
unsigned char flags; / 前 3 位保存类型，后 5 位未使用 /
char buf[];
};
struct attribute ((packed)) sdshdr64 {
uint64_t len; / 字符串长度，8 字节 64 位 /
uint64_t alloc; / 申请的总长度，8 字节 64 位 /
unsigned char flags; / 前 3 位保存类型，后 5 位未使用 */
char buf[];
};
旧版本 SDS 结构示例

优点：

旧版本相对于传统 C 字符串的优点，新版本都有
相对于旧版本，新版本可以通过字符串的长度，选择不同的结构，可以节约内存
使用 attribute ((packed)) ，让编译器取消结构在编译过程中的优化对齐，按照实际占用字节数进行对齐，可以节约内存
SDS 的初始化
sds 的定义，跟传统的C语言字符串保持类型兼容 char *。但是 sds 是二进制安全的，中间可能包含\0。

sds.h

typedef char *sds;
sds.c

// 初始化 sds
sds sdsnewlen(const void *init, size_t initlen) {
// 指向 sdshdr 开始地方的指针
void *sh;
// sds 实际是一个指针，指向 buf 开始的位置
sds s;
// 根据初始化的长度，返回 sds 的类型
char type = sdsReqType(initlen);
// initlen == 0，是空字符串，空字符串往往就是用来往后添加字节的，使用 SDS_TYPE_8 比 SDS_TYPE_5 更好
if (type == SDS_TYPE_5 && initlen == 0) type = SDS_TYPE_8;
// 根据类型获取 struct sdshdr 的长度
int hdrlen = sdsHdrSize(type);
// flags 字段的指针
unsigned char fp;
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// 开始分配空间，+1 是为了最后一个的结束符号 \0
sh = s_malloc(hdrlen+initlen+1);
if (sh == NULL) return NULL;
// const char SDS_NOINIT = “SDS_NOINIT”;
if (init==SDS_NOINIT)
init = NULL;
else if (!init)
// 不是 init 则清空 sh 的内存
memset(sh, 0, hdrlen+initlen+1);
// s 指向了 buf 开始的地址
// 从上面结构可以看出，内存地址的顺序： len, alloc, flag, buf
// 因为 buf 本身不占用空间，hdrlen 实际上就是结构的头(len、alloc、flags)
s = (char)sh+hdrlen;
// flags 占用 1 个字节，所以 s 退一位就是 flags 的开始位置了
fp = ((unsigned char)s)-1;
switch(type) {
case SDS_TYPE_5: {
// #define SDS_TYPE_BITS 3
// 前 3 位保存类型，后 5 位保存长度
*fp = type | (initlen << SDS_TYPE_BITS);
break;
}
case SDS_TYPE_8: {
// define SDS_HDR_VAR(T,s) struct sdshdr##T sh = (void)((s)-(sizeof(struct sdshdr##T)));
// sh 变量赋值了 struct sdshdr
SDS_HDR_VAR(8,s);
sh->len = initlen;
sh->alloc = initlen;
*fp = type;
break;
}
// 下面是对 SDS_TYPE_16、SDS_TYPE_32、SDS_TYPE_64 的初始化，跟 SDS_TYPE_8 的类似，篇幅有限，省略…
}
// 如果 init 非空，则把 init 字符串赋值给 s，实际上也是 buf 的初始化
if (initlen && init)
memcpy(s, init, initlen);
// 最后加一个结束标志 \0
s[initlen] = ‘\0’;
return s;
}
SDS 的扩/缩容
扩容
扩容就不跟初始化一样写注释写得那么详细了，直接拉最重要的几句代码就行。

sds sdsMakeRoomFor(sds s, size_t addlen) {
// #define SDS_MAX_PREALLOC (1024*1024)
// 当新的长度小于 1M 的时候，长度会增长一倍
// 当新的长度达到 1M 之后，最多就增长 1M 了
if (newlen < SDS_MAX_PREALLOC)
newlen *= 2;
else
newlen += SDS_MAX_PREALLOC;
// …
}
缩容
sds 缩短不会真正缩小 buf，而是只改长度而已，类型也不变。

sds.c

// 删掉字符串的左右字符中指定的字符
sds sdstrim(sds s, const char *cset) {
char *start, *end, *sp, *ep;
size_t len;

sp = start = s;
ep = end = s+sdslen(s)-1;
while(sp <= end && strchr(cset, *sp)) sp++;
while(ep > sp && strchr(cset, *ep)) ep--;
len = (sp > ep) ? 0 : ((ep-sp)+1);
if (s != sp) memmove(s, sp, len);

// 结尾符
s[len] = '\0';
// 缩短长度
sdssetlen(s,len);
return s;

}
sds.h

static inline void sdssetlen(sds s, size_t newlen) {
// 设置sds长度，只是修改 sdshdr 结构中的长度字段，类型不会变
unsigned char flags = s[-1];
switch(flags&SDS_TYPE_MASK) {
case SDS_TYPE_5:
{
unsigned char fp = ((unsigned char)s)-1;
*fp = (unsigned char)(SDS_TYPE_5 | (newlen << SDS_TYPE_BITS));
}
break;
case SDS_TYPE_8:
SDS_HDR(8,s)->len = (uint8_t)newlen;
break;
case SDS_TYPE_16:
SDS_HDR(16,s)->len = (uint16_t)newlen;
break;
case SDS_TYPE_32:
SDS_HDR(32,s)->len = (uint32_t)newlen;
break;
case SDS_TYPE_64:
SDS_HDR(64,s)->len = (uint64_t)newlen;
break;
}
}