lbbs/src/article_cache.c

/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
 * article_cache
 *   - convert article content from DB to local cache with LML conversion and line offset index
 *
 * Copyright (C) 2004-2025  Leaflet <leaflet@leafok.com>
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "article_cache.h"
#include "lml.h"
#include "log.h"
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>

enum _article_cache_constant_t
{
        ARTICLE_HEADER_MAX_LEN = 4096,
        ARTICLE_FOOTER_MAX_LEN = 4096,
        SUB_DT_MAX_LEN = 50,
};

static const char *BBS_article_footer_color[] = {
        "\033[31m",
        "\033[32m",
        "\033[33m",
        "\033[34m",
        "\033[35m",
        "\033[36m",
        "\033[37m",
};
static const int BBS_article_footer_color_count = 7;

static char *content_f; // static buffer in large size

inline static int article_cache_path(char *file_path, size_t buf_len, const char *cache_dir, const ARTICLE *p_article)
{
        if (file_path == NULL || cache_dir == NULL || p_article == NULL)
        {
                log_error("NULL pointer error");
                return -1;
        }

        snprintf(file_path, buf_len, "%s%d", cache_dir, p_article->cid);

        return 0;
}

int article_cache_generate(const char *cache_dir, const ARTICLE *p_article, const SECTION_LIST *p_section,
                                                   const char *content, const char *sub_ip, int overwrite)
{
        char data_file[FILE_PATH_LEN];
        int fd;
        ARTICLE_CACHE cache;
        struct tm tm_sub_dt;
        char str_sub_dt[SUB_DT_MAX_LEN + 1];
        char header[ARTICLE_HEADER_MAX_LEN];
        size_t header_len;
        long header_line_cnt;
        size_t body_len;
        long body_line_cnt;
        char footer[ARTICLE_FOOTER_MAX_LEN];
        size_t footer_len;
        long footer_line_cnt;
        long i;

        if (cache_dir == NULL || p_article == NULL || content == NULL)
        {
                log_error("NULL pointer error");
                return -1;
        }

        if (content_f == NULL && (content_f = malloc(ARTICLE_CONTENT_MAX_LEN)) == NULL)
        {
                log_error("malloc(content_f) error: OOM");
                return -1;
        }

        if (article_cache_path(data_file, sizeof(data_file), cache_dir, p_article) < 0)
        {
                log_error("article_cache_path(dir=%s, cid=%d) error", cache_dir, p_article->cid);
                return -1;
        }

        if (!overwrite)
        {
                if ((fd = open(data_file, O_RDONLY)) != -1) // check data file
                {
                        close(fd);
                        return 0;
                }
        }

        if ((fd = open(data_file, O_WRONLY | O_CREAT | O_TRUNC, 0640)) == -1)
        {
                log_error("open(%s) error (%d)", data_file, errno);
                return -2;
        }

        memset(&cache, 0, sizeof(cache));

        // Generate article header / footer
        localtime_r(&(p_article->sub_dt), &tm_sub_dt);
        strftime(str_sub_dt, sizeof(str_sub_dt), "%c %Z", &tm_sub_dt);

        snprintf(header, sizeof(header), "发布者: %s (%s), 版块: %s (%s)\n标  题: %s\n发布于: %s (%s)\n\n",
                         p_article->username, p_article->nickname, p_section->sname, p_section->stitle, p_article->title, BBS_name, str_sub_dt);

        snprintf(footer, sizeof(footer),
                         "\n--\n%s※ 来源: %s https://%s [FROM: %s]\033[m\n\n",
                         BBS_article_footer_color[p_article->aid % BBS_article_footer_color_count],
                         BBS_name, BBS_server, sub_ip);

        header_len = strnlen(header, sizeof(header));
        footer_len = strnlen(footer, sizeof(footer));

        header_line_cnt = split_data_lines(header, SCREEN_COLS, cache.line_offsets,
                                                                           MAX_SPLIT_FILE_LINES, 1, NULL);

        if (header_len != cache.line_offsets[header_line_cnt])
        {
                log_debug("Header of article(aid=%d) is truncated from %ld to %ld\n, body_line=%ld, body_line_limit=%ld",
                                  p_article->aid, header_len, cache.line_offsets[header_line_cnt],
                                  header_line_cnt, MAX_SPLIT_FILE_LINES);
                header_len = (size_t)cache.line_offsets[header_line_cnt];
        }

        // Apply LML render to content body
        body_len = (size_t)lml_render(content, content_f, ARTICLE_CONTENT_MAX_LEN, SCREEN_COLS, 0);
        cache.data_len = header_len + body_len;

        body_line_cnt = split_data_lines(content_f, SCREEN_COLS + 1, &(cache.line_offsets[header_line_cnt]),
                                                                         MAX_SPLIT_FILE_LINES - header_line_cnt, 1, NULL);
        cache.line_total = header_line_cnt + body_line_cnt;

        if (body_len != (size_t)cache.line_offsets[cache.line_total])
        {
                log_debug("Body of article(aid=%d) is truncated from %ld to %ld, body_line=%ld, body_line_limit=%ld",
                                  p_article->aid, body_len, cache.line_offsets[cache.line_total],
                                  body_line_cnt, MAX_SPLIT_FILE_LINES - header_line_cnt);
                cache.data_len = header_len + (size_t)(cache.line_offsets[cache.line_total]);
        }

        for (i = header_line_cnt; i <= cache.line_total; i++)
        {
                cache.line_offsets[i] += (long)header_len;
        }

        footer_line_cnt = split_data_lines(footer, SCREEN_COLS, &(cache.line_offsets[cache.line_total]),
                                                                           MAX_SPLIT_FILE_LINES - cache.line_total, 1, NULL);

        if (footer_len != cache.line_offsets[cache.line_total + footer_line_cnt])
        {
                log_debug("Footer of article(aid=%d) is truncated from %ld to %ld, footer_line=%ld, footer_line_limit=%ld",
                                  p_article->aid, footer_len, cache.line_offsets[cache.line_total + footer_line_cnt],
                                  footer_line_cnt, MAX_SPLIT_FILE_LINES - cache.line_total);
                footer_len = (size_t)(cache.line_offsets[cache.line_total + footer_line_cnt]);
        }

        for (i = 0; i <= footer_line_cnt; i++)
        {
                cache.line_offsets[cache.line_total + i] += (long)cache.data_len;
        }

        cache.data_len += footer_len;
        cache.line_total += footer_line_cnt;
        cache.mmap_len = sizeof(cache) - sizeof(long) * (MAX_SPLIT_FILE_LINES - (size_t)(cache.line_total) - 1) + cache.data_len;

        if (write(fd, &cache, cache.mmap_len - cache.data_len) == -1)
        {
                log_error("write(%s, cache) error (%d)", data_file, errno);
                close(fd);
                return -3;
        }
        if (write(fd, header, header_len) == -1)
        {
                log_error("write(%s, header) error (%d)", data_file, errno);
                close(fd);
                return -3;
        }
        if (write(fd, content_f, cache.data_len - header_len - footer_len) == -1)
        {
                log_error("write(%s, content) error (%d)", data_file, errno);
                close(fd);
                return -3;
        }
        if (write(fd, footer, footer_len) == -1)
        {
                log_error("write(%s, footer) error (%d)", data_file, errno);
                close(fd);
                return -3;
        }

        if (close(fd) == -1)
        {
                log_error("close(%s) error (%d)", data_file, errno);
                return -2;
        }

        return 0;
}

void article_cache_cleanup(void)
{
        if (content_f)
        {
                free(content_f);
                content_f = NULL;
        }
}

int article_cache_load(ARTICLE_CACHE *p_cache, const char *cache_dir, const ARTICLE *p_article)
{
        char data_file[FILE_PATH_LEN];
        int fd;
        struct stat sb;
        void *p_mmap;
        size_t mmap_len;

        if (p_cache == NULL || cache_dir == NULL || p_article == NULL)
        {
                log_error("NULL pointer error");
                return -1;
        }

        if (article_cache_path(data_file, sizeof(data_file), cache_dir, p_article) < 0)
        {
                log_error("article_cache_path(dir=%s, cid=%d) error", cache_dir, p_article->cid);
                return -1;
        }

        if ((fd = open(data_file, O_RDONLY)) == -1)
        {
                log_error("open(%s) error (%d)", data_file, errno);
                return -2;
        }

        if (fstat(fd, &sb) < 0)
        {
                log_error("fstat(fd) error (%d)", errno);
                return -2;
        }

        mmap_len = (size_t)sb.st_size;

        p_mmap = mmap(NULL, mmap_len, PROT_READ, MAP_SHARED, fd, 0L);
        if (p_mmap == MAP_FAILED)
        {
                log_error("mmap(%s) error (%d)", data_file, errno);
                return -2;
        }

        if (close(fd) == -1)
        {
                log_error("close(%s) error (%d)", data_file, errno);
                return -2;
        }

        if (((ARTICLE_CACHE *)p_mmap)->mmap_len != mmap_len)
        {
                log_error("Inconsistent mmap len of article (cid=%d), %ld != %ld", p_article->cid, p_cache->mmap_len, mmap_len);
                return -3;
        }

        memset(p_cache, 0, sizeof(*p_cache));
        memcpy((void *)p_cache, p_mmap, (size_t)(((ARTICLE_CACHE *)p_mmap)->mmap_len - ((ARTICLE_CACHE *)p_mmap)->data_len));

        p_cache->p_mmap = p_mmap;
        p_cache->p_data = (char *)p_mmap + (p_cache->mmap_len - p_cache->data_len);

        return 0;
}

int article_cache_unload(ARTICLE_CACHE *p_cache)
{
        if (p_cache == NULL || p_cache->p_mmap == NULL)
        {
                log_error("NULL pointer error");
                return -1;
        }

        if (munmap(p_cache->p_mmap, p_cache->mmap_len) < 0)
        {
                log_error("munmap() error (%d)", errno);
                return -2;
        }

        p_cache->p_mmap = NULL;
        p_cache->p_data = NULL;

        return 0;
}
1	/* SPDX-License-Identifier: GPL-3.0-or-later */
2	/*
3	* article_cache
4	* - convert article content from DB to local cache with LML conversion and line offset index
5	*
6	* Copyright (C) 2004-2025 Leaflet <leaflet@leafok.com>
7	*/
8
9	#ifdef HAVE_CONFIG_H
10	#include "config.h"
11	#endif
12
13	#include "article_cache.h"
14	#include "lml.h"
15	#include "log.h"
16	#include <errno.h>
17	#include <fcntl.h>
18	#include <stdio.h>
19	#include <stdlib.h>
20	#include <string.h>
21	#include <time.h>
22	#include <unistd.h>
23	#include <sys/mman.h>
24	#include <sys/stat.h>
25
26	enum _article_cache_constant_t
27	{
28	ARTICLE_HEADER_MAX_LEN = 4096,
29	ARTICLE_FOOTER_MAX_LEN = 4096,
30	SUB_DT_MAX_LEN = 50,
31	};
32
33	static const char *BBS_article_footer_color[] = {
34	"\033[31m",
35	"\033[32m",
36	"\033[33m",
37	"\033[34m",
38	"\033[35m",
39	"\033[36m",
40	"\033[37m",
41	};
42	static const int BBS_article_footer_color_count = 7;
43
44	static char *content_f; // static buffer in large size
45
46	inline static int article_cache_path(char file_path, size_t buf_len, const char cache_dir, const ARTICLE *p_article)
47	{
48	if (file_path == NULL \|\| cache_dir == NULL \|\| p_article == NULL)
49	{
50	log_error("NULL pointer error");
51	return -1;
52	}
53
54	snprintf(file_path, buf_len, "%s%d", cache_dir, p_article->cid);
55
56	return 0;
57	}
58
59	int article_cache_generate(const char cache_dir, const ARTICLE p_article, const SECTION_LIST *p_section,
60	const char content, const char sub_ip, int overwrite)
61	{
62	char data_file[FILE_PATH_LEN];
63	int fd;
64	ARTICLE_CACHE cache;
65	struct tm tm_sub_dt;
66	char str_sub_dt[SUB_DT_MAX_LEN + 1];
67	char header[ARTICLE_HEADER_MAX_LEN];
68	size_t header_len;
69	long header_line_cnt;
70	size_t body_len;
71	long body_line_cnt;
72	char footer[ARTICLE_FOOTER_MAX_LEN];
73	size_t footer_len;
74	long footer_line_cnt;
75	long i;
76
77	if (cache_dir == NULL \|\| p_article == NULL \|\| content == NULL)
78	{
79	log_error("NULL pointer error");
80	return -1;
81	}
82
83	if (content_f == NULL && (content_f = malloc(ARTICLE_CONTENT_MAX_LEN)) == NULL)
84	{
85	log_error("malloc(content_f) error: OOM");
86	return -1;
87	}
88
89	if (article_cache_path(data_file, sizeof(data_file), cache_dir, p_article) < 0)
90	{
91	log_error("article_cache_path(dir=%s, cid=%d) error", cache_dir, p_article->cid);
92	return -1;
93	}
94
95	if (!overwrite)
96	{
97	if ((fd = open(data_file, O_RDONLY)) != -1) // check data file
98	{
99	close(fd);
100	return 0;
101	}
102	}
103
104	if ((fd = open(data_file, O_WRONLY \| O_CREAT \| O_TRUNC, 0640)) == -1)
105	{
106	log_error("open(%s) error (%d)", data_file, errno);
107	return -2;
108	}
109
110	memset(&cache, 0, sizeof(cache));
111
112	// Generate article header / footer
113	localtime_r(&(p_article->sub_dt), &tm_sub_dt);
114	strftime(str_sub_dt, sizeof(str_sub_dt), "%c %Z", &tm_sub_dt);
115
116	snprintf(header, sizeof(header), "发布者: %s (%s), 版块: %s (%s)\n标题: %s\n发布于: %s (%s)\n\n",
117	p_article->username, p_article->nickname, p_section->sname, p_section->stitle, p_article->title, BBS_name, str_sub_dt);
118
119	snprintf(footer, sizeof(footer),
120	"\n--\n%s※ 来源: %s https://%s [FROM: %s]\033[m\n\n",
121	BBS_article_footer_color[p_article->aid % BBS_article_footer_color_count],
122	BBS_name, BBS_server, sub_ip);
123
124	header_len = strnlen(header, sizeof(header));
125	footer_len = strnlen(footer, sizeof(footer));
126
127	header_line_cnt = split_data_lines(header, SCREEN_COLS, cache.line_offsets,
128	MAX_SPLIT_FILE_LINES, 1, NULL);
129
130	if (header_len != cache.line_offsets[header_line_cnt])
131	{
132	log_debug("Header of article(aid=%d) is truncated from %ld to %ld\n, body_line=%ld, body_line_limit=%ld",
133	p_article->aid, header_len, cache.line_offsets[header_line_cnt],
134	header_line_cnt, MAX_SPLIT_FILE_LINES);
135	header_len = (size_t)cache.line_offsets[header_line_cnt];
136	}
137
138	// Apply LML render to content body
139	body_len = (size_t)lml_render(content, content_f, ARTICLE_CONTENT_MAX_LEN, SCREEN_COLS, 0);
140	cache.data_len = header_len + body_len;
141
142	body_line_cnt = split_data_lines(content_f, SCREEN_COLS + 1, &(cache.line_offsets[header_line_cnt]),
143	MAX_SPLIT_FILE_LINES - header_line_cnt, 1, NULL);
144	cache.line_total = header_line_cnt + body_line_cnt;
145
146	if (body_len != (size_t)cache.line_offsets[cache.line_total])
147	{
148	log_debug("Body of article(aid=%d) is truncated from %ld to %ld, body_line=%ld, body_line_limit=%ld",
149	p_article->aid, body_len, cache.line_offsets[cache.line_total],
150	body_line_cnt, MAX_SPLIT_FILE_LINES - header_line_cnt);
151	cache.data_len = header_len + (size_t)(cache.line_offsets[cache.line_total]);
152	}
153
154	for (i = header_line_cnt; i <= cache.line_total; i++)
155	{
156	cache.line_offsets[i] += (long)header_len;
157	}
158
159	footer_line_cnt = split_data_lines(footer, SCREEN_COLS, &(cache.line_offsets[cache.line_total]),
160	MAX_SPLIT_FILE_LINES - cache.line_total, 1, NULL);
161
162	if (footer_len != cache.line_offsets[cache.line_total + footer_line_cnt])
163	{
164	log_debug("Footer of article(aid=%d) is truncated from %ld to %ld, footer_line=%ld, footer_line_limit=%ld",
165	p_article->aid, footer_len, cache.line_offsets[cache.line_total + footer_line_cnt],
166	footer_line_cnt, MAX_SPLIT_FILE_LINES - cache.line_total);
167	footer_len = (size_t)(cache.line_offsets[cache.line_total + footer_line_cnt]);
168	}
169
170	for (i = 0; i <= footer_line_cnt; i++)
171	{
172	cache.line_offsets[cache.line_total + i] += (long)cache.data_len;
173	}
174
175	cache.data_len += footer_len;
176	cache.line_total += footer_line_cnt;
177	cache.mmap_len = sizeof(cache) - sizeof(long) * (MAX_SPLIT_FILE_LINES - (size_t)(cache.line_total) - 1) + cache.data_len;
178
179	if (write(fd, &cache, cache.mmap_len - cache.data_len) == -1)
180	{
181	log_error("write(%s, cache) error (%d)", data_file, errno);
182	close(fd);
183	return -3;
184	}
185	if (write(fd, header, header_len) == -1)
186	{
187	log_error("write(%s, header) error (%d)", data_file, errno);
188	close(fd);
189	return -3;
190	}
191	if (write(fd, content_f, cache.data_len - header_len - footer_len) == -1)
192	{
193	log_error("write(%s, content) error (%d)", data_file, errno);
194	close(fd);
195	return -3;
196	}
197	if (write(fd, footer, footer_len) == -1)
198	{
199	log_error("write(%s, footer) error (%d)", data_file, errno);
200	close(fd);
201	return -3;
202	}
203
204	if (close(fd) == -1)
205	{
206	log_error("close(%s) error (%d)", data_file, errno);
207	return -2;
208	}
209
210	return 0;
211	}
212
213	void article_cache_cleanup(void)
214	{
215	if (content_f)
216	{
217	free(content_f);
218	content_f = NULL;
219	}
220	}
221
222	int article_cache_load(ARTICLE_CACHE p_cache, const char cache_dir, const ARTICLE *p_article)
223	{
224	char data_file[FILE_PATH_LEN];
225	int fd;
226	struct stat sb;
227	void *p_mmap;
228	size_t mmap_len;
229
230	if (p_cache == NULL \|\| cache_dir == NULL \|\| p_article == NULL)
231	{
232	log_error("NULL pointer error");
233	return -1;
234	}
235
236	if (article_cache_path(data_file, sizeof(data_file), cache_dir, p_article) < 0)
237	{
238	log_error("article_cache_path(dir=%s, cid=%d) error", cache_dir, p_article->cid);
239	return -1;
240	}
241
242	if ((fd = open(data_file, O_RDONLY)) == -1)
243	{
244	log_error("open(%s) error (%d)", data_file, errno);
245	return -2;
246	}
247
248	if (fstat(fd, &sb) < 0)
249	{
250	log_error("fstat(fd) error (%d)", errno);
251	return -2;
252	}
253
254	mmap_len = (size_t)sb.st_size;
255
256	p_mmap = mmap(NULL, mmap_len, PROT_READ, MAP_SHARED, fd, 0L);
257	if (p_mmap == MAP_FAILED)
258	{
259	log_error("mmap(%s) error (%d)", data_file, errno);
260	return -2;
261	}
262
263	if (close(fd) == -1)
264	{
265	log_error("close(%s) error (%d)", data_file, errno);
266	return -2;
267	}
268
269	if (((ARTICLE_CACHE *)p_mmap)->mmap_len != mmap_len)
270	{
271	log_error("Inconsistent mmap len of article (cid=%d), %ld != %ld", p_article->cid, p_cache->mmap_len, mmap_len);
272	return -3;
273	}
274
275	memset(p_cache, 0, sizeof(*p_cache));
276	memcpy((void )p_cache, p_mmap, (size_t)(((ARTICLE_CACHE )p_mmap)->mmap_len - ((ARTICLE_CACHE *)p_mmap)->data_len));
277
278	p_cache->p_mmap = p_mmap;
279	p_cache->p_data = (char *)p_mmap + (p_cache->mmap_len - p_cache->data_len);
280
281	return 0;
282	}
283
284	int article_cache_unload(ARTICLE_CACHE *p_cache)
285	{
286	if (p_cache == NULL \|\| p_cache->p_mmap == NULL)
287	{
288	log_error("NULL pointer error");
289	return -1;
290	}
291
292	if (munmap(p_cache->p_mmap, p_cache->mmap_len) < 0)
293	{
294	log_error("munmap() error (%d)", errno);
295	return -2;
296	}
297
298	p_cache->p_mmap = NULL;
299	p_cache->p_data = NULL;
300
301	return 0;
302	}
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