3801f3ac0d
- config.c/config.h: 极简 JSON 解析器，支持数字/字符串/布尔//注释 - cocoon_config_t 新增 gzip_enabled 字段（默认 true） - main.c: -c <file> 加载配置，--no-gzip 禁用压缩，命令行覆盖配置 - 修复 -r 参数 strdup 崩溃（避免 free 野指针） - 修复 signal handler 双重 free 问题 - 单元测试: test_config.c 17 个测试全部通过 - 集成测试: 32 项全部通过 - README 修正过时描述（配置方式、安全设计、-v 说明）
313 lines
9.7 KiB
C
313 lines
9.7 KiB
C
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/**
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* config.c - JSON 配置文件解析实现
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*
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* 极简 JSON 解析器，只处理 cocoon 配置所需的字段：
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* - 字符串（root_dir, log_level）
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* - 整数（port, num_workers, max_connections, timeout_ms）
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* - 布尔值（threaded）
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*
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* 保持零依赖，不引入外部 JSON 库。
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*
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* @author xfy
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <errno.h>
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/* === 内部：极简 JSON token 类型 === */
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typedef enum {
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TOKEN_EOF,
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TOKEN_LBRACE, /* { */
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TOKEN_RBRACE, /* } */
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TOKEN_STRING, /* "..." */
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TOKEN_NUMBER, /* 123 */
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TOKEN_TRUE, /* true */
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TOKEN_FALSE, /* false */
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TOKEN_COMMA, /* , */
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TOKEN_COLON, /* : */
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TOKEN_INVALID /* 错误 */
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} token_type_t;
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typedef struct {
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token_type_t type;
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const char *start;
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size_t len;
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int line;
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} token_t;
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typedef struct {
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const char *src;
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size_t pos;
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size_t len;
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int line;
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} parser_t;
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/* === 内部：parser 辅助函数 === */
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static void parser_init(parser_t *p, const char *src, size_t len) {
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p->src = src;
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p->pos = 0;
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p->len = len;
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p->line = 1;
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}
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static void parser_skip_ws(parser_t *p) {
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while (p->pos < p->len) {
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char c = p->src[p->pos];
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if (c == ' ' || c == '\t' || c == '\r') {
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p->pos++;
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} else if (c == '\n') {
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p->pos++;
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p->line++;
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} else if (c == '/' && p->pos + 1 < p->len && p->src[p->pos + 1] == '/') {
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/* 跳过 // 注释 */
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p->pos += 2;
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while (p->pos < p->len && p->src[p->pos] != '\n') p->pos++;
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} else {
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break;
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}
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}
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}
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static token_t parser_next_token(parser_t *p) {
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parser_skip_ws(p);
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token_t t = {TOKEN_INVALID, NULL, 0, p->line};
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if (p->pos >= p->len) {
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t.type = TOKEN_EOF;
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return t;
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}
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const char *start = p->src + p->pos;
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char c = start[0];
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switch (c) {
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case '{': p->pos++; t.type = TOKEN_LBRACE; return t;
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case '}': p->pos++; t.type = TOKEN_RBRACE; return t;
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case ',': p->pos++; t.type = TOKEN_COMMA; return t;
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case ':': p->pos++; t.type = TOKEN_COLON; return t;
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case '"': {
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/* 字符串 */
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p->pos++; /* skip " */
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t.start = p->src + p->pos;
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while (p->pos < p->len && p->src[p->pos] != '"') {
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if (p->src[p->pos] == '\\' && p->pos + 1 < p->len) {
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p->pos += 2; /* skip escaped */
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} else {
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p->pos++;
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}
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}
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t.len = (size_t)(p->src + p->pos - t.start);
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if (p->pos < p->len) p->pos++; /* skip closing " */
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t.type = TOKEN_STRING;
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return t;
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}
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default: {
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if (isdigit(c) || c == '-') {
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/* 数字 */
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t.start = start;
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p->pos++;
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while (p->pos < p->len && (isdigit(p->src[p->pos]) || p->src[p->pos] == '.')) {
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p->pos++;
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}
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t.len = (size_t)(p->src + p->pos - t.start);
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t.type = TOKEN_NUMBER;
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return t;
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} else if (strncmp(start, "true", 4) == 0) {
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p->pos += 4;
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t.type = TOKEN_TRUE;
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return t;
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} else if (strncmp(start, "false", 5) == 0) {
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p->pos += 5;
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t.type = TOKEN_FALSE;
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return t;
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}
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/* 未知 token */
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p->pos++;
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t.type = TOKEN_INVALID;
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return t;
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}
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}
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}
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static bool token_expect(parser_t *p, token_type_t expected) {
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token_t t = parser_next_token(p);
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return t.type == expected;
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}
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/* 复制 token 内容为 C 字符串（处理转义） */
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static char *token_str_dup(const token_t *t) {
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char *buf = (char *)malloc(t->len + 1);
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if (!buf) return NULL;
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size_t j = 0;
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for (size_t i = 0; i < t->len; i++) {
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if (t->start[i] == '\\' && i + 1 < t->len) {
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char next = t->start[i + 1];
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switch (next) {
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case 'n': buf[j++] = '\n'; i++; break;
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case 't': buf[j++] = '\t'; i++; break;
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case 'r': buf[j++] = '\r'; i++; break;
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case '\\': buf[j++] = '\\'; i++; break;
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case '"': buf[j++] = '"'; i++; break;
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default: buf[j++] = t->start[i]; break;
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}
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} else {
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buf[j++] = t->start[i];
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}
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}
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buf[j] = '\0';
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return buf;
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}
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static long token_to_long(const token_t *t) {
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char buf[32] = {0};
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size_t n = t->len < 31 ? t->len : 31;
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memcpy(buf, t->start, n);
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return strtol(buf, NULL, 10);
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}
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static log_level_t str_to_log_level(const char *str) {
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if (strcmp(str, "error") == 0) return LOG_LEVEL_ERROR;
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if (strcmp(str, "warn") == 0) return LOG_LEVEL_WARN;
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if (strcmp(str, "info") == 0) return LOG_LEVEL_INFO;
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if (strcmp(str, "debug") == 0) return LOG_LEVEL_DEBUG;
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return LOG_LEVEL_INFO; /* 默认 */
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}
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/* === 公共 API === */
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bool config_load_from_file(const char *path, cocoon_config_t *config) {
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if (!path || !config) return false;
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FILE *fp = fopen(path, "r");
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if (!fp) {
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fprintf(stderr, "[Config] 无法打开配置文件: %s (%s)\n", path, strerror(errno));
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return false;
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}
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/* 读取文件内容 */
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fseek(fp, 0, SEEK_END);
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long size = ftell(fp);
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fseek(fp, 0, SEEK_SET);
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if (size <= 0 || size > 65536) { /* 限制 64KB */
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fclose(fp);
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fprintf(stderr, "[Config] 配置文件过大或为空\n");
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return false;
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}
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char *buf = (char *)malloc((size_t)size + 1);
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if (!buf) {
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fclose(fp);
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return false;
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}
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size_t read = fread(buf, 1, (size_t)size, fp);
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fclose(fp);
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buf[read] = '\0';
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parser_t p;
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parser_init(&p, buf, read);
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/* 期望 { */
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if (!token_expect(&p, TOKEN_LBRACE)) {
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fprintf(stderr, "[Config] 配置文件格式错误: 期望 '{'\n");
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free(buf);
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return false;
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}
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/* 解析键值对 */
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while (1) {
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token_t key = parser_next_token(&p);
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if (key.type == TOKEN_RBRACE) break; /* 空对象 {} */
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if (key.type != TOKEN_STRING) {
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fprintf(stderr, "[Config] 第 %d 行: 期望字符串键\n", key.line);
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free(buf);
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return false;
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}
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if (!token_expect(&p, TOKEN_COLON)) {
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fprintf(stderr, "[Config] 第 %d 行: 键后缺少 ':'\n", key.line);
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free(buf);
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return false;
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}
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token_t val = parser_next_token(&p);
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char *key_str = token_str_dup(&key);
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if (strcmp(key_str, "root_dir") == 0 && val.type == TOKEN_STRING) {
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char *v = token_str_dup(&val);
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if (v) {
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free((void *)config->root_dir); /* 释放旧的 */
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config->root_dir = v;
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}
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} else if (strcmp(key_str, "port") == 0 && val.type == TOKEN_NUMBER) {
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long v = token_to_long(&val);
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if (v > 0 && v < 65536) config->port = (uint16_t)v;
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} else if (strcmp(key_str, "threaded") == 0) {
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if (val.type == TOKEN_TRUE) config->threaded = true;
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else if (val.type == TOKEN_FALSE) config->threaded = false;
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} else if (strcmp(key_str, "num_workers") == 0 && val.type == TOKEN_NUMBER) {
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long v = token_to_long(&val);
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if (v > 0 && v < 1024) config->num_workers = (uint32_t)v;
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} else if (strcmp(key_str, "max_connections") == 0 && val.type == TOKEN_NUMBER) {
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long v = token_to_long(&val);
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if (v >= 0 && v < 1000000) config->max_connections = (uint32_t)v;
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} else if (strcmp(key_str, "timeout_ms") == 0 && val.type == TOKEN_NUMBER) {
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long v = token_to_long(&val);
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if (v >= 0 && v < 3600000) config->timeout_ms = (uint32_t)v;
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} else if (strcmp(key_str, "log_level") == 0 && val.type == TOKEN_STRING) {
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char *v = token_str_dup(&val);
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if (v) {
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config->log_level = str_to_log_level(v);
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free(v);
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}
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} else if (strcmp(key_str, "gzip_enabled") == 0) {
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if (val.type == TOKEN_TRUE) config->gzip_enabled = true;
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else if (val.type == TOKEN_FALSE) config->gzip_enabled = false;
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}
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/* 其他字段：忽略（未来扩展预留） */
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free(key_str);
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/* 检查逗号或右括号 */
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token_t sep = parser_next_token(&p);
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if (sep.type == TOKEN_RBRACE) break;
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if (sep.type != TOKEN_COMMA) {
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fprintf(stderr, "[Config] 第 %d 行: 期望 ',' 或 '}'\n", sep.line);
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free(buf);
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return false;
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}
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}
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free(buf);
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return true;
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}
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void config_merge(cocoon_config_t *base, const cocoon_config_t *cmdline,
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bool has_root_dir, bool has_port, bool has_workers,
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bool has_max_conn, bool has_timeout, bool has_log_level,
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bool has_gzip_enabled) {
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if (!base || !cmdline) return;
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/* 命令行显式指定的值覆盖配置文件 */
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if (has_root_dir && cmdline->root_dir) {
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free((void *)base->root_dir);
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base->root_dir = strdup(cmdline->root_dir);
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}
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if (has_port) base->port = cmdline->port;
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if (has_workers) base->num_workers = cmdline->num_workers;
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if (has_max_conn) base->max_connections = cmdline->max_connections;
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if (has_timeout) base->timeout_ms = cmdline->timeout_ms;
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if (has_log_level) base->log_level = cmdline->log_level;
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if (has_gzip_enabled) base->gzip_enabled = cmdline->gzip_enabled;
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/* threaded 是 flag 参数，命令行指定了就用命令行的 */
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if (cmdline->threaded) base->threaded = true;
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}
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