552 lines
17 KiB
C
552 lines
17 KiB
C
#include "kvs_protocol_resp.h"
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#include "kvs_rw_tools.h"
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#if ENABLE_ARRAY
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extern kvs_array_t global_array;
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#endif
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#if ENABLE_RBTREE
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extern kvs_rbtree_t global_rbtree;
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#endif
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#if ENABLE_HASH
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extern kvs_hash_t global_hash;
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#endif
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static int need(const uint8_t *p, const uint8_t *end, size_t n) {
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return (p + n <= end) ? 0 : -1;
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}
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/* find "\r\n", return \r */
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static int find_crlf(const uint8_t *p, const uint8_t *end, const uint8_t **line_end) {
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const uint8_t *q = p;
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size_t lim = (size_t)(end - p);
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if (lim > (size_t)RESP_MAX_LINE) lim = (size_t)RESP_MAX_LINE;
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const uint8_t *stop = p + lim;
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while (q + 1 < stop) {
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if (q[0] == '\r' && q[1] == '\n') {
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*line_end = q;
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return 0;
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}
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q++;
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}
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return -1;
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}
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/* 解析有符号整数 [p, line_end) */
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static int parse_i64(const uint8_t *p, const uint8_t *line_end, int64_t *out) {
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if (!p || !line_end || p >= line_end) return -1;
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int neg = 0;
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if (*p == '-') {
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neg = 1;
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p++;
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if (p >= line_end) return -1;
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}
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int64_t x = 0;
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for (const uint8_t *q = p; q < line_end; q++) {
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if (*q < '0' || *q > '9') return -1;
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int digit = (int)(*q - '0');
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/* overflow-safe-ish for typical Redis sizes */
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if (x > (INT64_MAX - digit) / 10) return -1;
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x = x * 10 + digit;
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}
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*out = neg ? -x : x;
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return 0;
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}
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// 字符串比对
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int ascii_casecmp(const uint8_t *a, uint32_t alen, const char *b) {
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size_t blen = strlen(b);
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if (alen != (uint32_t)blen) return -1;
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for (uint32_t i = 0; i < alen; i++) {
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uint8_t ca = a[i];
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uint8_t cb = (uint8_t)b[i];
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if (ca >= 'A' && ca <= 'Z') ca = (uint8_t)(ca + 32);
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if (cb >= 'A' && cb <= 'Z') cb = (uint8_t)(cb + 32);
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if (ca != cb) return -1;
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}
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return 0;
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}
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/* ----------------- RESP2 parser (one command) ----------------- */
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/* 解析批量字符串：$<长度>\r\n<字节>\r\n
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* 成功时，将切片指向 <字节> 部分，并前进 *pp。
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* 返回值：-1 错误，0 需要更多数据，1 成功
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*/
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static int parse_bulk(const uint8_t **pp, const uint8_t *end, resp_slice_t *out) {
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const uint8_t *p = *pp;
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if (need(p, end, 1) < 0) return 0;
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if (*p != '$') return -1;
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p++;
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const uint8_t *le = NULL;
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// 寻找 <长度> 的末尾
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if (find_crlf(p, end, &le) < 0) return 0; /* need more */
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int64_t n64 = 0;
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// 解析 <长度>
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if (parse_i64(p, le, &n64) < 0) return -1;
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p = le + 2; /* 跳过 CRLF */
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if (n64 < 0) {
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/* nil bulk ($-1) 无效. */
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return -1;
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}
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/* 大于 RESP_MAX_BULK 也无效 */
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if ((uint64_t)n64 > (uint64_t)RESP_MAX_BULK) return -1;
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uint32_t n = (uint32_t)n64;
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if (need(p, end, (size_t)n + 2) < 0) return 0; /* need more */
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// byte = <字节> 的首位
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const uint8_t *bytes = p;
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p += n;
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// <字节>+n 不是\r\n 解析错误
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if (p[0] != '\r' || p[1] != '\n') return -1;
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// 跳过\r\n
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p += 2;
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out->ptr = bytes;
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out->len = n;
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// 移动指针
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*pp = p;
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return 1;
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}
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/* 解析数组头: *<n>\r\n */
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static int parse_array_len(const uint8_t **pp, const uint8_t *end, int64_t *out_n) {
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const uint8_t *p = *pp;
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if (need(p, end, 1) < 0) return 0;
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if (*p != '*') return -1;
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p++;
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const uint8_t *le = NULL;
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if (find_crlf(p, end, &le) < 0) return 0;
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int64_t n64 = 0;
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if (parse_i64(p, le, &n64) < 0) return -1;
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p = le + 2;
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*pp = p;
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*out_n = n64;
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return 1;
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}
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/* 解析简单命令 */
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static int parse_inline(const uint8_t *buf, int len, resp_cmd_t *out_cmd) {
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const uint8_t *p = buf;
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const uint8_t *end = buf + (size_t)len;
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const uint8_t *le = NULL;
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if (find_crlf(p, end, &le) < 0) return 0; /* need more */
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/* split [p, le) by spaces/tabs */
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out_cmd->argc = 0;
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const uint8_t *s = p;
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while (s < le) {
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while (s < le && (*s == ' ' || *s == '\t')) s++;
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if (s >= le) break;
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const uint8_t *t = s;
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while (t < le && *t != ' ' && *t != '\t') t++;
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if (out_cmd->argc >= RESP_MAX_ARGC) return -1;
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out_cmd->argv[out_cmd->argc].ptr = s;
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out_cmd->argv[out_cmd->argc].len = (uint32_t)(t - s);
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out_cmd->argc++;
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s = t;
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}
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if (out_cmd->argc == 0) return -1;
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return (int)((le + 2) - buf);
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}
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int resp_parse_one_cmd(const uint8_t *buf, int len, resp_cmd_t *out_cmd) {
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if (!buf || len <= 0 || !out_cmd) return -1;
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memset(out_cmd, 0, sizeof(*out_cmd));
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const uint8_t *p = buf;
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const uint8_t *end = buf + (size_t)len;
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if (need(p, end, 1) < 0) return 0;
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if (*p != '*') {
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/* inline */
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return parse_inline(buf, len, out_cmd);
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}
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/* multi bulk */
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int64_t n64 = 0;
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int r = parse_array_len(&p, end, &n64);
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if (r == 0) return 0;
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if (r < 0) return -1;
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if (n64 <= 0 || n64 > (int64_t)RESP_MAX_ARGC) return -1;
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out_cmd->argc = (uint32_t)n64;
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/* scan + parse each bulk string */
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for (uint32_t i = 0; i < out_cmd->argc; i++) {
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resp_slice_t sl = {0};
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int rr = parse_bulk(&p, end, &sl);
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if (rr == 0) return 0;
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if (rr < 0) return -1;
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out_cmd->argv[i] = sl;
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}
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return (int)(p - buf);
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}
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/* ----------------- RESP2 builder ----------------- */
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static int write_bytes(uint8_t **pp, const uint8_t *end, const void *src, size_t n) {
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uint8_t *p = *pp;
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if ((size_t)(end - p) < n) return -1;
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memcpy(p, src, n);
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p += n;
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*pp = p;
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return 0;
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}
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static int write_crlf(uint8_t **pp, const uint8_t *end) {
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return write_bytes(pp, end, "\r\n", 2);
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}
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static int write_i64_ascii(uint8_t **pp, const uint8_t *end, int64_t x) {
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char tmp[64];
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int n = snprintf(tmp, sizeof(tmp), "%lld", (long long)x);
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if (n <= 0) return -1;
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return write_bytes(pp, end, tmp, (size_t)n);
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}
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static int write_u32_ascii(uint8_t **pp, const uint8_t *end, uint32_t x) {
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char tmp[32];
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int n = snprintf(tmp, sizeof(tmp), "%u", (unsigned)x);
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if (n <= 0) return -1;
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return write_bytes(pp, end, tmp, (size_t)n);
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}
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int resp_build_value(const resp_value_t *v, uint8_t *out, size_t cap) {
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if (!v || !out || cap == 0) return -1;
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uint8_t *p = out;
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const uint8_t *end = out + cap;
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switch (v->type) {
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case RESP_T_SIMPLE_STR:
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if (write_bytes(&p, end, "+", 1) < 0) return -1;
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if (write_bytes(&p, end, v->bulk.ptr, v->bulk.len) < 0) return -1;
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if (write_crlf(&p, end) < 0) return -1;
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break;
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case RESP_T_ERROR:
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if (write_bytes(&p, end, "-", 1) < 0) return -1;
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if (write_bytes(&p, end, v->bulk.ptr, v->bulk.len) < 0) return -1;
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if (write_crlf(&p, end) < 0) return -1;
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break;
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case RESP_T_INTEGER:
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if (write_bytes(&p, end, ":", 1) < 0) return -1;
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if (write_i64_ascii(&p, end, v->i64) < 0) return -1;
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if (write_crlf(&p, end) < 0) return -1;
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break;
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case RESP_T_NIL:
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if (write_bytes(&p, end, "$-1\r\n", 5) < 0) return -1;
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break;
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case RESP_T_BULK_STR:
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if (write_bytes(&p, end, "$", 1) < 0) return -1;
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if (write_u32_ascii(&p, end, v->bulk.len) < 0) return -1;
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if (write_crlf(&p, end) < 0) return -1;
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if (v->bulk.len > 0 && v->bulk.ptr) {
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if (write_bytes(&p, end, v->bulk.ptr, v->bulk.len) < 0) return -1;
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}
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if (write_crlf(&p, end) < 0) return -1;
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break;
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default:
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return -1;
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}
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return (int)(p - out);
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}
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/* helpers */
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resp_value_t resp_simple(const char *s) {
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resp_value_t v;
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v.type = RESP_T_SIMPLE_STR;
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v.i64 = 0;
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v.bulk.ptr = (const uint8_t*)s;
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v.bulk.len = (uint32_t)strlen(s);
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return v;
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}
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resp_value_t resp_error(const char *s) {
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resp_value_t v;
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v.type = RESP_T_ERROR;
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v.i64 = 0;
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v.bulk.ptr = (const uint8_t*)s;
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v.bulk.len = (uint32_t)strlen(s);
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return v;
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}
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resp_value_t resp_int(int64_t x) {
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resp_value_t v;
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v.type = RESP_T_INTEGER;
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v.i64 = x;
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v.bulk.ptr = NULL;
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v.bulk.len = 0;
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return v;
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}
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resp_value_t resp_bulk(const uint8_t *p, uint32_t n) {
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resp_value_t v;
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v.type = RESP_T_BULK_STR;
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v.i64 = 0;
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v.bulk.ptr = p;
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v.bulk.len = n;
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return v;
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}
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resp_value_t resp_nil(void) {
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resp_value_t v;
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v.type = RESP_T_NIL;
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v.i64 = 0;
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v.bulk.ptr = NULL;
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v.bulk.len = 0;
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return v;
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}
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/* ----------------- dispatcher (minimal) ----------------- */
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static int expect_argv(const resp_cmd_t *cmd, uint32_t n) {
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return (cmd && cmd->argc == n) ? 0 : -1;
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}
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const char *command[] = {
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"SET", "GET", "DEL", "MOD", "EXIST",
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"RSET", "RGET", "RDEL", "RMOD", "REXIST",
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"HSET", "HGET", "HDEL", "HMOD", "HEXIST",
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"SAVE", "PSYNC"
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};
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/**
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* 输入：cmd
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* 输出：out_value
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* 返回：-1 失败，参数错误，0 成功
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*/
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int resp_dispatch(const resp_cmd_t *cmd, resp_value_t *out_value) {
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if (!cmd || !out_value) return -1;
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if (cmd->argc == 0 || cmd->argv[0].ptr == NULL) {
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*out_value = resp_error("ERR empty command");
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return 0;
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}
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const uint8_t *cptr = cmd->argv[0].ptr;
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uint32_t clen = cmd->argv[0].len;
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kvs_cmd_t op = KVS_CMD_COUNT;
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for(kvs_cmd_t i = KVS_CMD_START; i < KVS_CMD_COUNT; ++ i){
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if(ascii_casecmp(cptr, clen, command[i]) == 0){
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op = i;
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break;
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}
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}
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if (op == KVS_CMD_COUNT) {
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*out_value = resp_error("ERR unknown command");
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return -1;
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}
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switch (op) {
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#if ENABLE_ARRAY
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case KVS_CMD_SET: {
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if (cmd->argc != 3) { *out_value = resp_error("ERR wrong number of arguments for 'set'"); return -1; }
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// <0 error; 0 success; 1 exist
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int r = kvs_array_set_bin(&global_array,
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cmd->argv[1].ptr, cmd->argv[1].len,
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cmd->argv[2].ptr, cmd->argv[2].len);
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if (r < 0) { *out_value = resp_error("ERR internal error"); return 0; }
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else if (r == 1) { *out_value = resp_error("ERR key has exist"); return 0; }
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*out_value = resp_simple("OK");
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return 0;
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}
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case KVS_CMD_GET: {
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if (cmd->argc != 2) { *out_value = resp_error("ERR wrong number of arguments for 'get'"); return -1; }
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uint32_t vlen = 0;
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// NULL not exist, NOTNULL exist
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const char *v = kvs_array_get_bin(&global_array, cmd->argv[1].ptr, cmd->argv[1].len, &vlen);
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if (!v) { *out_value = resp_nil(); return 0; }
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*out_value = resp_bulk((const uint8_t*)v, vlen);
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return 0;
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}
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case KVS_CMD_DEL: {
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if (cmd->argc != 2) { *out_value = resp_error("ERR wrong number of arguments for 'del'"); return -1; }
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// <0 error; =0 success; >0 no exist
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int r = kvs_array_del_bin(&global_array, cmd->argv[1].ptr, cmd->argv[1].len);
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if (r < 0) { *out_value = resp_error("ERR internal error"); return 0; }
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// r == 0, del 1; r > 0, del 0.
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*out_value = resp_int((r == 0) ? 1 : 0);
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return 0;
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}
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case KVS_CMD_MOD: {
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if (cmd->argc != 3) { *out_value = resp_error("ERR wrong number of arguments for 'mod'"); return -1; }
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// <0 error; =0 success; >0 no exist
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int r = kvs_array_mod_bin(&global_array,
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cmd->argv[1].ptr, cmd->argv[1].len,
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cmd->argv[2].ptr, cmd->argv[2].len);
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if (r < 0) { *out_value = resp_error("ERR internal error"); return 0; }
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if (r == 0) *out_value = resp_simple("OK");
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else *out_value = resp_error("ERR no such key");
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return 0;
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}
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case KVS_CMD_EXIST: {
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if (cmd->argc != 2) { *out_value = resp_error("ERR wrong number of arguments for 'exist'"); return -1; }
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// =0 exist, =1 no exist
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int r = kvs_array_exist_bin(&global_array, cmd->argv[1].ptr, cmd->argv[1].len);
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if (r < 0) { *out_value = resp_error("ERR internal error"); return 0; }
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*out_value = resp_int((r == 0) ? 1 : 0);
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return 0;
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}
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#endif
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#if ENABLE_RBTREE
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case KVS_CMD_RSET: {
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if (cmd->argc != 3) { *out_value = resp_error("ERR wrong number of arguments for 'rset'"); return 0; }
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// <0 error; 0 success; 1 exist
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int r = kvs_rbtree_set(&global_rbtree,
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cmd->argv[1].ptr, cmd->argv[1].len,
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cmd->argv[2].ptr, cmd->argv[2].len);
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if (r < 0) { *out_value = resp_error("ERR internal error"); return 0; }
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else if (r == 1) { *out_value = resp_error("ERR key has exist"); return 0; }
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*out_value = resp_simple("OK");
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return 0;
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}
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case KVS_CMD_RGET: {
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if (cmd->argc != 2) { *out_value = resp_error("ERR wrong number of arguments for 'rget'"); return 0; }
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uint32_t vlen = 0;
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// NULL notexist, NOTNULL exist。out_value_len 是长度。
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const char *v = kvs_rbtree_get(&global_rbtree, cmd->argv[1].ptr, cmd->argv[1].len, &vlen);
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if (!v) { *out_value = resp_nil(); return 0; }
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*out_value = resp_bulk((const uint8_t*)v, vlen);
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return 0;
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}
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case KVS_CMD_RDEL: {
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if (cmd->argc != 2) { *out_value = resp_error("ERR wrong number of arguments for 'rdel'"); return 0; }
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// <0 error; =0 success; >0 no exist
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int r = kvs_rbtree_del(&global_rbtree, cmd->argv[1].ptr, cmd->argv[1].len);
|
||
if (r < 0) { *out_value = resp_error("ERR internal error"); return 0; }
|
||
*out_value = resp_int((r == 0) ? 1 : 0);
|
||
return 0;
|
||
}
|
||
|
||
case KVS_CMD_RMOD: {
|
||
if (cmd->argc != 3) { *out_value = resp_error("ERR wrong number of arguments for 'rmod'"); return 0; }
|
||
// < 0 error; =0 success; >0 no exist
|
||
int r = kvs_rbtree_mod(&global_rbtree,
|
||
cmd->argv[1].ptr, cmd->argv[1].len,
|
||
cmd->argv[2].ptr, cmd->argv[2].len);
|
||
if (r < 0) { *out_value = resp_error("ERR internal error"); return 0; }
|
||
if (r == 0) *out_value = resp_simple("OK");
|
||
else *out_value = resp_error("ERR no such key");
|
||
return 0;
|
||
}
|
||
|
||
case KVS_CMD_REXIST: {
|
||
if (cmd->argc != 2) { *out_value = resp_error("ERR wrong number of arguments for 'rexist'"); return 0; }
|
||
// =0 exist, =1 no exist
|
||
int r = kvs_rbtree_exist(&global_rbtree, cmd->argv[1].ptr, cmd->argv[1].len);
|
||
if (r < 0) { *out_value = resp_error("ERR internal error"); return 0; }
|
||
*out_value = resp_int((r == 0) ? 1 : 0);
|
||
return 0;
|
||
}
|
||
#endif
|
||
|
||
#if ENABLE_HASH
|
||
case KVS_CMD_HSET: {
|
||
if (cmd->argc != 3) { *out_value = resp_error("ERR wrong number of arguments for 'hset'"); return 0; }
|
||
// <0 error; 0 success; 1 exist
|
||
int r = kvs_hash_set_bin(&global_hash,
|
||
cmd->argv[1].ptr, cmd->argv[1].len,
|
||
cmd->argv[2].ptr, cmd->argv[2].len);
|
||
if (r < 0) { *out_value = resp_error("ERR internal error"); return 0; }
|
||
else if (r == 1) { *out_value = resp_error("ERR key has exist"); return 0; }
|
||
*out_value = resp_simple("OK");
|
||
return 0;
|
||
}
|
||
|
||
case KVS_CMD_HGET: {
|
||
if (cmd->argc != 2) { *out_value = resp_error("ERR wrong number of arguments for 'hget'"); return 0; }
|
||
uint32_t vlen = 0;
|
||
// NULL notexist, NOTNULL exist。out_value_len 是长度。
|
||
const char *v = kvs_hash_get_bin(&global_hash, cmd->argv[1].ptr, cmd->argv[1].len, &vlen);
|
||
if (!v) { *out_value = resp_nil(); return 0; }
|
||
*out_value = resp_bulk((const uint8_t*)v, vlen);
|
||
return 0;
|
||
}
|
||
|
||
case KVS_CMD_HDEL: {
|
||
if (cmd->argc != 2) { *out_value = resp_error("ERR wrong number of arguments for 'hdel'"); return 0; }
|
||
// <0 error; =0 success; >0 no exist
|
||
int r = kvs_hash_del_bin(&global_hash, cmd->argv[1].ptr, cmd->argv[1].len);
|
||
if (r < 0) { *out_value = resp_error("ERR internal error"); return 0; }
|
||
*out_value = resp_int((r == 0) ? 1 : 0);
|
||
return 0;
|
||
}
|
||
|
||
case KVS_CMD_HMOD: {
|
||
if (cmd->argc != 3) { *out_value = resp_error("ERR wrong number of arguments for 'hmod'"); return 0; }
|
||
// <0 error; =0 success; >0 no exist
|
||
int r = kvs_hash_mod_bin(&global_hash,
|
||
cmd->argv[1].ptr, cmd->argv[1].len,
|
||
cmd->argv[2].ptr, cmd->argv[2].len);
|
||
if (r < 0) { *out_value = resp_error("ERR internal error"); return 0; }
|
||
if (r == 0) *out_value = resp_simple("OK");
|
||
else *out_value = resp_error("ERR no such key");
|
||
return 0;
|
||
}
|
||
|
||
case KVS_CMD_HEXIST: {
|
||
if (cmd->argc != 2) { *out_value = resp_error("ERR wrong number of arguments for 'hexist'"); return 0; }
|
||
// =0 exist, =1 no exist
|
||
int r = kvs_hash_exist_bin(&global_hash, cmd->argv[1].ptr, cmd->argv[1].len);
|
||
if (r < 0) { *out_value = resp_error("ERR internal error"); return 0; }
|
||
*out_value = resp_int((r == 0) ? 1 : 0);
|
||
return 0;
|
||
}
|
||
|
||
#endif
|
||
/* ---------------- misc ---------------- */
|
||
case KVS_CMD_SAVE: {
|
||
if (cmd->argc != 1) { *out_value = resp_error("ERR wrong number of arguments for 'save'"); return 0; }
|
||
int r = kvs_save_to_file();
|
||
if (r < 0) { *out_value = resp_error("ERR save failed"); return 0; }
|
||
*out_value = resp_simple("OK");
|
||
return 0;
|
||
}
|
||
case KVS_CMD_PSYNC:
|
||
*out_value = resp_simple("OK");
|
||
return 0;
|
||
default:
|
||
break;
|
||
}
|
||
|
||
*out_value = resp_error("ERR unknown command");
|
||
return 0;
|
||
} |