lbbs/src/article_cache.c

/***************************************************************************
                                           article_cache.c  -  description
                                                         -------------------
        Copyright            : (C) 2004-2025 by Leaflet
        Email                : leaflet@leafok.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 3 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#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>

#define ARTICLE_HEADER_MAX_LEN 4096
#define ARTICLE_CONTENT_MAX_LEN 1024 * 1024 * 4 // 4MB
#define ARTICLE_FOOTER_MAX_LEN 4096
#define 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\n");
                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;
        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\n");
                return -1;
        }

        if (content_f == NULL && (content_f = malloc(ARTICLE_CONTENT_MAX_LEN)) == NULL)
        {
                log_error("malloc(content_f) error: OOM\n");
                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\n", 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)\n", 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", &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 http://%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])
        {
#ifdef _DEBUG
                log_error("Header of article(aid=%d) is truncated from %ld to %ld\n", p_article->aid, header_len, cache.line_offsets[header_line_cnt]);
#endif
                header_len = (size_t)cache.line_offsets[header_line_cnt];
        }

        // Apply LML render to content body
        cache.data_len = header_len + (size_t)lml_render(content, content_f, ARTICLE_CONTENT_MAX_LEN, 1);

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

        if (cache.data_len - header_len != (size_t)cache.line_offsets[cache.line_total])
        {
#ifdef _DEBUG
                log_error("Body of article(aid=%d) is truncated from %ld to %ld\n",
                                  p_article->aid, cache.data_len - header_len, cache.line_offsets[cache.line_total]);
#endif
                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])
        {
#ifdef _DEBUG
                log_error("Footer of article(aid=%d) is truncated from %ld to %ld\n",
                                  p_article->aid, footer_len, cache.line_offsets[cache.line_total + footer_line_cnt]);
#endif
                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)\n", data_file, errno);
                close(fd);
                return -3;
        }
        if (write(fd, header, header_len) == -1)
        {
                log_error("write(%s, header) error (%d)\n", 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)\n", data_file, errno);
                close(fd);
                return -3;
        }
        if (write(fd, footer, footer_len) == -1)
        {
                log_error("write(%s, footer) error (%d)\n", data_file, errno);
                close(fd);
                return -3;
        }

        if (close(fd) == -1)
        {
                log_error("close(%s) error (%d)\n", 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\n");
                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\n", cache_dir, p_article->cid);
                return -1;
        }

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

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

        if (close(fd) == -1)
        {
                log_error("close(%s) error (%d)\n", 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\n", 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 = 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\n");
                return -1;
        }

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

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

        return 0;
}
1	sysadm	1.1	/***************************************************************************
2			article_cache.c - description
3			-------------------
4			Copyright : (C) 2004-2025 by Leaflet
5			Email : leaflet@leafok.com
6			***************************************************************************/
7
8			/***************************************************************************
9			* *
10			* This program is free software; you can redistribute it and/or modify *
11			* it under the terms of the GNU General Public License as published by *
12			* the Free Software Foundation; either version 3 of the License, or *
13			* (at your option) any later version. *
14			* *
15			***************************************************************************/
16
17			#include "article_cache.h"
18	sysadm	1.21	#include "lml.h"
19	sysadm	1.2	#include "log.h"
20			#include <errno.h>
21	sysadm	1.21	#include <fcntl.h>
22	sysadm	1.2	#include <stdio.h>
23			#include <stdlib.h>
24	sysadm	1.21	#include <string.h>
25			#include <time.h>
26	sysadm	1.2	#include <unistd.h>
27			#include <sys/mman.h>
28			#include <sys/stat.h>
29	sysadm	1.1
30	sysadm	1.2	#define ARTICLE_HEADER_MAX_LEN 4096
31	sysadm	1.12	#define ARTICLE_CONTENT_MAX_LEN 1024 * 1024 * 4 // 4MB
32	sysadm	1.5	#define ARTICLE_FOOTER_MAX_LEN 4096
33			#define SUB_DT_MAX_LEN 50
34	sysadm	1.2
35	sysadm	1.7	static const char *BBS_article_footer_color[] = {
36			"\033[31m",
37			"\033[32m",
38			"\033[33m",
39			"\033[34m",
40			"\033[35m",
41			"\033[36m",
42			"\033[37m",
43			};
44			static const int BBS_article_footer_color_count = 7;
45
46	sysadm	1.22	static char *content_f; // static buffer in large size
47
48	sysadm	1.2	inline static int article_cache_path(char file_path, size_t buf_len, const char cache_dir, const ARTICLE *p_article)
49			{
50			if (file_path == NULL \|\| cache_dir == NULL \|\| p_article == NULL)
51			{
52	sysadm	1.27	log_error("NULL pointer error\n");
53	sysadm	1.2	return -1;
54			}
55
56			snprintf(file_path, buf_len, "%s%d", cache_dir, p_article->cid);
57
58			return 0;
59			}
60
61	sysadm	1.5	int article_cache_generate(const char cache_dir, const ARTICLE p_article, const SECTION_LIST *p_section,
62			const char content, const char sub_ip, int overwrite)
63	sysadm	1.1	{
64	sysadm	1.2	char data_file[FILE_PATH_LEN];
65			int fd;
66			ARTICLE_CACHE cache;
67	sysadm	1.3	struct tm tm_sub_dt;
68	sysadm	1.5	char str_sub_dt[SUB_DT_MAX_LEN + 1];
69	sysadm	1.3	char header[ARTICLE_HEADER_MAX_LEN];
70			size_t header_len;
71			long header_line_cnt;
72	sysadm	1.5	char footer[ARTICLE_FOOTER_MAX_LEN];
73			size_t footer_len;
74			long footer_line_cnt;
75	sysadm	1.3	long i;
76	sysadm	1.2
77			if (cache_dir == NULL \|\| p_article == NULL \|\| content == NULL)
78			{
79	sysadm	1.27	log_error("NULL pointer error\n");
80	sysadm	1.2	return -1;
81			}
82
83	sysadm	1.16	if (content_f == NULL && (content_f = malloc(ARTICLE_CONTENT_MAX_LEN)) == NULL)
84			{
85			log_error("malloc(content_f) error: OOM\n");
86			return -1;
87			}
88
89	sysadm	1.2	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\n", 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)\n", data_file, errno);
107			return -2;
108			}
109
110	sysadm	1.18	memset(&cache, 0, sizeof(cache));
111	sysadm	1.3
112	sysadm	1.5	// Generate article header / footer
113	sysadm	1.3	localtime_r(&(p_article->sub_dt), &tm_sub_dt);
114			strftime(str_sub_dt, sizeof(str_sub_dt), "%c", &tm_sub_dt);
115
116	sysadm	1.24	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	sysadm	1.3	p_article->username, p_article->nickname, p_section->sname, p_section->stitle, p_article->title, BBS_name, str_sub_dt);
118
119	sysadm	1.5	snprintf(footer, sizeof(footer),
120	sysadm	1.24	"\n--\n%s※ 来源: %s http://%s [FROM: %s]\033[m\n\n",
121	sysadm	1.7	BBS_article_footer_color[p_article->aid % BBS_article_footer_color_count],
122	sysadm	1.5	BBS_name, BBS_server, sub_ip);
123
124	sysadm	1.3	header_len = strnlen(header, sizeof(header));
125	sysadm	1.5	footer_len = strnlen(footer, sizeof(footer));
126
127	sysadm	1.23	header_line_cnt = split_data_lines(header, SCREEN_COLS, cache.line_offsets, MAX_SPLIT_FILE_LINES, 1, NULL);
128	sysadm	1.10
129			if (header_len != cache.line_offsets[header_line_cnt])
130			{
131	sysadm	1.20	#ifdef _DEBUG
132			log_error("Header of article(aid=%d) is truncated from %ld to %ld\n", p_article->aid, header_len, cache.line_offsets[header_line_cnt]);
133			#endif
134	sysadm	1.10	header_len = (size_t)cache.line_offsets[header_line_cnt];
135			}
136
137	sysadm	1.12	// Apply LML render to content body
138	sysadm	1.26	cache.data_len = header_len + (size_t)lml_render(content, content_f, ARTICLE_CONTENT_MAX_LEN, 1);
139	sysadm	1.12
140	sysadm	1.3	cache.line_total = header_line_cnt +
141	sysadm	1.23	split_data_lines(content_f, SCREEN_COLS, cache.line_offsets + header_line_cnt, MAX_SPLIT_FILE_LINES - header_line_cnt, 1, NULL);
142	sysadm	1.11
143	sysadm	1.10	if (cache.data_len - header_len != (size_t)cache.line_offsets[cache.line_total])
144			{
145	sysadm	1.20	#ifdef _DEBUG
146			log_error("Body of article(aid=%d) is truncated from %ld to %ld\n",
147			p_article->aid, cache.data_len - header_len, cache.line_offsets[cache.line_total]);
148			#endif
149	sysadm	1.10	cache.data_len = header_len + (size_t)(cache.line_offsets[cache.line_total]);
150			}
151
152	sysadm	1.3	for (i = header_line_cnt; i <= cache.line_total; i++)
153			{
154			cache.line_offsets[i] += (long)header_len;
155	sysadm	1.2	}
156
157	sysadm	1.23	footer_line_cnt = split_data_lines(footer, SCREEN_COLS, cache.line_offsets + cache.line_total, MAX_SPLIT_FILE_LINES - cache.line_total, 1, NULL);
158	sysadm	1.5
159	sysadm	1.10	if (footer_len != cache.line_offsets[cache.line_total + footer_line_cnt])
160			{
161	sysadm	1.20	#ifdef _DEBUG
162			log_error("Footer of article(aid=%d) is truncated from %ld to %ld\n",
163			p_article->aid, footer_len, cache.line_offsets[cache.line_total + footer_line_cnt]);
164			#endif
165	sysadm	1.10	footer_len = (size_t)(cache.line_offsets[cache.line_total + footer_line_cnt]);
166			}
167
168	sysadm	1.5	for (i = 0; i <= footer_line_cnt; i++)
169			{
170			cache.line_offsets[cache.line_total + i] += (long)cache.data_len;
171			}
172
173			cache.data_len += footer_len;
174			cache.line_total += footer_line_cnt;
175	sysadm	1.8	cache.mmap_len = sizeof(cache) - sizeof(long) * (MAX_SPLIT_FILE_LINES - (size_t)(cache.line_total) - 1) + cache.data_len;
176	sysadm	1.5
177	sysadm	1.8	if (write(fd, &cache, cache.mmap_len - cache.data_len) == -1)
178	sysadm	1.2	{
179			log_error("write(%s, cache) error (%d)\n", data_file, errno);
180			close(fd);
181			return -3;
182			}
183	sysadm	1.3	if (write(fd, header, header_len) == -1)
184			{
185			log_error("write(%s, header) error (%d)\n", data_file, errno);
186			close(fd);
187			return -3;
188			}
189	sysadm	1.12	if (write(fd, content_f, cache.data_len - header_len - footer_len) == -1)
190	sysadm	1.2	{
191	sysadm	1.3	log_error("write(%s, content) error (%d)\n", data_file, errno);
192	sysadm	1.2	close(fd);
193			return -3;
194			}
195	sysadm	1.5	if (write(fd, footer, footer_len) == -1)
196			{
197			log_error("write(%s, footer) error (%d)\n", data_file, errno);
198			close(fd);
199			return -3;
200			}
201	sysadm	1.2
202			if (close(fd) == -1)
203			{
204			log_error("close(%s) error (%d)\n", data_file, errno);
205			return -2;
206			}
207
208	sysadm	1.1	return 0;
209			}
210
211	sysadm	1.22	void article_cache_cleanup(void)
212			{
213			if (content_f)
214			{
215			free(content_f);
216			content_f = NULL;
217			}
218			}
219
220	sysadm	1.1	int article_cache_load(ARTICLE_CACHE p_cache, const char cache_dir, const ARTICLE *p_article)
221			{
222	sysadm	1.2	char data_file[FILE_PATH_LEN];
223			int fd;
224	sysadm	1.4	struct stat sb;
225			void *p_mmap;
226			size_t mmap_len;
227	sysadm	1.2
228			if (p_cache == NULL \|\| cache_dir == NULL \|\| p_article == NULL)
229			{
230	sysadm	1.27	log_error("NULL pointer error\n");
231	sysadm	1.2	return -1;
232			}
233
234			if (article_cache_path(data_file, sizeof(data_file), cache_dir, p_article) < 0)
235			{
236			log_error("article_cache_path(dir=%s, cid=%d) error\n", cache_dir, p_article->cid);
237			return -1;
238			}
239
240			if ((fd = open(data_file, O_RDONLY)) == -1)
241			{
242			log_error("open(%s) error (%d)\n", data_file, errno);
243			return -2;
244			}
245
246	sysadm	1.4	if (fstat(fd, &sb) < 0)
247	sysadm	1.2	{
248	sysadm	1.4	log_error("fstat(fd) error (%d)\n", errno);
249			return -2;
250	sysadm	1.2	}
251
252	sysadm	1.4	mmap_len = (size_t)sb.st_size;
253	sysadm	1.2
254	sysadm	1.4	p_mmap = mmap(NULL, mmap_len, PROT_READ, MAP_SHARED, fd, 0L);
255			if (p_mmap == MAP_FAILED)
256	sysadm	1.2	{
257	sysadm	1.4	log_error("mmap(%s) error (%d)\n", data_file, errno);
258			return -2;
259	sysadm	1.2	}
260
261			if (close(fd) == -1)
262			{
263			log_error("close(%s) error (%d)\n", data_file, errno);
264			return -2;
265			}
266
267	sysadm	1.8	if (((ARTICLE_CACHE *)p_mmap)->mmap_len != mmap_len)
268	sysadm	1.4	{
269	sysadm	1.8	log_error("Inconsistent mmap len of article (cid=%d), %ld != %ld\n", p_article->cid, p_cache->mmap_len, mmap_len);
270	sysadm	1.4	return -3;
271			}
272
273	sysadm	1.18	memset(p_cache, 0, sizeof(*p_cache));
274	sysadm	1.8	memcpy((void )p_cache, p_mmap, (size_t)(((ARTICLE_CACHE )p_mmap)->mmap_len - ((ARTICLE_CACHE *)p_mmap)->data_len));
275
276	sysadm	1.4	p_cache->p_mmap = p_mmap;
277	sysadm	1.8	p_cache->p_data = p_mmap + (p_cache->mmap_len - p_cache->data_len);
278	sysadm	1.4
279	sysadm	1.1	return 0;
280			}
281
282			int article_cache_unload(ARTICLE_CACHE *p_cache)
283			{
284	sysadm	1.4	if (p_cache == NULL \|\| p_cache->p_mmap == NULL)
285	sysadm	1.2	{
286	sysadm	1.27	log_error("NULL pointer error\n");
287	sysadm	1.2	return -1;
288			}
289
290	sysadm	1.8	if (munmap(p_cache->p_mmap, p_cache->mmap_len) < 0)
291	sysadm	1.4	{
292			log_error("munmap() error (%d)\n", errno);
293			return -2;
294			}
295
296			p_cache->p_mmap = NULL;
297	sysadm	1.2	p_cache->p_data = NULL;
298
299	sysadm	1.1	return 0;
300			}
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