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/***************************************************************************
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section_list_loader.c - description
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-------------------
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Copyright : (C) 2004-2025 by Leaflet
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Email : leaflet@leafok.com
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#include "section_list_loader.h"
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#include "log.h"
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#include "database.h"
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#include "menu.h"
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <strings.h>
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#include <unistd.h>
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#define _POSIX_C_SOURCE 200809L
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#include <string.h>
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#define SECTION_LIST_LOAD_INTERVAL 10 // second
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int section_list_loader_pid;
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int last_article_op_log_mid;
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int load_section_config_from_db(void)
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{
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MYSQL *db;
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MYSQL_RES *rs, *rs2;
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MYSQL_ROW row, row2;
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char sql[SQL_BUFFER_LEN];
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int32_t sid;
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char master_list[(BBS_username_max_len + 1) * 3 + 1];
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SECTION_LIST *p_section;
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int ret;
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db = db_open();
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if (db == NULL)
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{
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log_error("db_open() error: %s\n", mysql_error(db));
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return -2;
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}
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snprintf(sql, sizeof(sql),
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"SELECT section_config.SID, sname, section_config.title, section_config.CID, "
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"read_user_level, write_user_level, section_config.enable * section_class.enable AS enable "
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"FROM section_config INNER JOIN section_class ON section_config.CID = section_class.CID "
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"ORDER BY section_config.SID");
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if (mysql_query(db, sql) != 0)
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{
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log_error("Query section_list error: %s\n", mysql_error(db));
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return -3;
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}
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if ((rs = mysql_store_result(db)) == NULL)
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{
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log_error("Get section_list data failed\n");
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return -3;
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}
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ret = 0;
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while ((row = mysql_fetch_row(rs)))
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{
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sid = atoi(row[0]);
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// Query section master
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snprintf(sql, sizeof(sql),
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"SELECT username FROM section_master "
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"INNER JOIN user_list ON section_master.UID = user_list.UID "
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"WHERE SID = %d AND section_master.enable AND (NOW() BETWEEN begin_dt AND end_dt) "
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"ORDER BY major DESC, begin_dt ASC LIMIT 3",
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sid);
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if (mysql_query(db, sql) != 0)
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{
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log_error("Query section_master error: %s\n", mysql_error(db));
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ret = -3;
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break;
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}
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if ((rs2 = mysql_store_result(db)) == NULL)
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{
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log_error("Get section_master data failed\n");
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ret = -3;
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break;
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}
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master_list[0] = '\0';
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while ((row2 = mysql_fetch_row(rs2)))
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{
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strncat(master_list, row2[0], sizeof(master_list) - 1 - strnlen(master_list, sizeof(master_list)));
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strncat(master_list, " ", sizeof(master_list) - 1 - strnlen(master_list, sizeof(master_list)));
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}
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mysql_free_result(rs2);
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p_section = section_list_find_by_sid(sid);
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if (p_section == NULL)
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{
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p_section = section_list_create(sid, row[1], row[2], master_list);
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if (p_section == NULL)
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{
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log_error("section_list_create() error: load new section sid = %d sname = %s\n", sid, row[1]);
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ret = -4;
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break;
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}
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// acquire rw lock
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ret = section_list_rw_lock(p_section);
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if (ret < 0)
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{
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break;
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}
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}
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else
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{
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// acquire rw lock
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ret = section_list_rw_lock(p_section);
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if (ret < 0)
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{
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break;
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}
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strncpy(p_section->sname, row[1], sizeof(p_section->sname) - 1);
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p_section->sname[sizeof(p_section->sname) - 1] = '\0';
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strncpy(p_section->stitle, row[1], sizeof(p_section->stitle) - 1);
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p_section->stitle[sizeof(p_section->stitle) - 1] = '\0';
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strncpy(p_section->master_list, master_list, sizeof(p_section->master_list) - 1);
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p_section->master_list[sizeof(p_section->master_list) - 1] = '\0';
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}
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p_section->class_id = atoi(row[3]);
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p_section->read_user_level = atoi(row[4]);
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p_section->write_user_level = atoi(row[5]);
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p_section->enable = (int8_t)atoi(row[6]);
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// release rw lock
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ret = section_list_rw_unlock(p_section);
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if (ret < 0)
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{
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break;
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}
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}
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mysql_free_result(rs);
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mysql_close(db);
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return ret;
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}
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int append_articles_from_db(int32_t start_aid, int global_lock)
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{
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MYSQL *db;
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MYSQL_RES *rs;
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MYSQL_ROW row;
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char sql[SQL_BUFFER_LEN];
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ARTICLE article;
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ARTICLE *p_topic;
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SECTION_LIST *p_section = NULL;
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int32_t last_sid = 0;
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int ret = 0;
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int i;
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db = db_open();
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if (db == NULL)
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{
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log_error("db_open() error: %s\n", mysql_error(db));
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return -2;
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}
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snprintf(sql, sizeof(sql),
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"SELECT AID, TID, SID, CID, UID, visible, excerption, ontop, `lock`, "
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"transship, username, nickname, title, UNIX_TIMESTAMP(sub_dt) AS sub_dt "
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"FROM bbs WHERE AID >= %d ORDER BY AID",
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start_aid);
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if (mysql_query(db, sql) != 0)
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{
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log_error("Query article list error: %s\n", mysql_error(db));
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return -3;
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}
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if ((rs = mysql_use_result(db)) == NULL)
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{
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log_error("Get article list data failed\n");
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return -3;
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}
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// acquire global lock
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if (global_lock)
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{
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if ((ret = section_list_rw_lock(NULL)) < 0)
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{
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log_error("section_list_rw_lock(sid = 0) error\n");
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goto cleanup;
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}
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}
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while ((row = mysql_fetch_row(rs)))
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{
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bzero(&article, sizeof(ARTICLE));
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// copy data of article
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i = 0;
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article.aid = atoi(row[i++]);
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article.tid = atoi(row[i++]);
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article.sid = atoi(row[i++]);
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article.cid = atoi(row[i++]);
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article.uid = atoi(row[i++]);
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article.visible = (int8_t)atoi(row[i++]);
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article.excerption = (int8_t)atoi(row[i++]);
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article.ontop = (int8_t)atoi(row[i++]);
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article.lock = (int8_t)atoi(row[i++]);
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article.transship = (int8_t)atoi(row[i++]);
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strncpy(article.username, row[i++], sizeof(article.username) - 1);
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article.username[sizeof(article.username) - 1] = '\0';
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strncpy(article.nickname, row[i++], sizeof(article.nickname) - 1);
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article.nickname[sizeof(article.nickname) - 1] = '\0';
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strncpy(article.title, row[i++], sizeof(article.title) - 1);
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article.title[sizeof(article.title) - 1] = '\0';
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article.sub_dt = atol(row[i++]);
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// release lock of last section if different from current one
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if (!global_lock && article.sid != last_sid && last_sid != 0)
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{
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if ((ret = section_list_rw_unlock(p_section)) < 0)
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{
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log_error("section_list_rw_unlock(sid = %d) error\n", p_section->sid);
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break;
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}
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}
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if ((p_section = section_list_find_by_sid(article.sid)) == NULL)
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{
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log_error("section_list_find_by_sid(%d) error: unknown section, try reloading section config\n", article.sid);
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ret = ERR_UNKNOWN_SECTION; // Unknown section found
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break;
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}
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if (article.visible != 0 && article.tid != 0)
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{
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// Check if topic article is visible
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p_topic = article_block_find_by_aid(article.tid);
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if (p_topic == NULL || p_topic->visible == 0)
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{
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// log_error("Set article (aid = %d) as invisible due to invisible or non-existing topic head\n", article.aid);
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article.tid = 0;
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article.visible = 0;
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}
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}
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// acquire lock of current section if different from last one
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if (!global_lock && article.sid != last_sid)
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{
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| 267 |
if ((ret = section_list_rw_lock(p_section)) < 0)
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{
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log_error("section_list_rw_lock(sid = 0) error\n");
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| 270 |
break;
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}
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}
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// append article to section list
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last_sid = article.sid;
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| 276 |
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if (section_list_append_article(p_section, &article) < 0)
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{
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log_error("section_list_append_article(sid = %d, aid = %d) error\n",
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p_section->sid, article.aid);
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ret = -3;
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break;
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| 283 |
}
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}
|
| 285 |
|
| 286 |
// release lock of last section
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| 287 |
if (!global_lock && last_sid != 0)
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{
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if ((ret = section_list_rw_unlock(p_section)) < 0)
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{
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log_error("section_list_rw_unlock(sid = %d) error\n", p_section->sid);
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}
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}
|
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|
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// release global lock
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if (global_lock)
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{
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if ((ret = section_list_rw_unlock(NULL)) < 0)
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{
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| 300 |
log_error("section_list_rw_unlock(sid = 0) error\n");
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}
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}
|
| 303 |
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cleanup:
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mysql_free_result(rs);
|
| 306 |
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mysql_close(db);
|
| 308 |
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return ret;
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}
|
| 311 |
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int set_last_article_op_log_from_db(void)
|
| 313 |
{
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| 314 |
MYSQL *db;
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MYSQL_RES *rs;
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MYSQL_ROW row;
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| 317 |
char sql[SQL_BUFFER_LEN];
|
| 318 |
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db = db_open();
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| 320 |
if (db == NULL)
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{
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| 322 |
log_error("db_open() error: %s\n", mysql_error(db));
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| 323 |
return -1;
|
| 324 |
}
|
| 325 |
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| 326 |
snprintf(sql, sizeof(sql),
|
| 327 |
"SELECT MID FROM bbs_article_op ORDER BY MID DESC LIMIT 1");
|
| 328 |
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| 329 |
if (mysql_query(db, sql) != 0)
|
| 330 |
{
|
| 331 |
log_error("Query article op error: %s\n", mysql_error(db));
|
| 332 |
return -2;
|
| 333 |
}
|
| 334 |
if ((rs = mysql_store_result(db)) == NULL)
|
| 335 |
{
|
| 336 |
log_error("Get article op data failed\n");
|
| 337 |
return -2;
|
| 338 |
}
|
| 339 |
|
| 340 |
if ((row = mysql_fetch_row(rs)))
|
| 341 |
{
|
| 342 |
last_article_op_log_mid = atoi(row[0]);
|
| 343 |
}
|
| 344 |
|
| 345 |
mysql_free_result(rs);
|
| 346 |
|
| 347 |
mysql_close(db);
|
| 348 |
|
| 349 |
return last_article_op_log_mid;
|
| 350 |
}
|
| 351 |
|
| 352 |
int apply_article_op_log_from_db(void)
|
| 353 |
{
|
| 354 |
MYSQL *db;
|
| 355 |
MYSQL_RES *rs, *rs2;
|
| 356 |
MYSQL_ROW row, row2;
|
| 357 |
char sql[SQL_BUFFER_LEN];
|
| 358 |
ARTICLE *p_article;
|
| 359 |
SECTION_LIST *p_section = NULL;
|
| 360 |
SECTION_LIST *p_section_dest;
|
| 361 |
int32_t last_sid = 0;
|
| 362 |
int32_t sid_dest;
|
| 363 |
int ret = 0;
|
| 364 |
|
| 365 |
db = db_open();
|
| 366 |
if (db == NULL)
|
| 367 |
{
|
| 368 |
log_error("db_open() error: %s\n", mysql_error(db));
|
| 369 |
return -3;
|
| 370 |
}
|
| 371 |
|
| 372 |
snprintf(sql, sizeof(sql),
|
| 373 |
"SELECT MID, AID, type FROM bbs_article_op "
|
| 374 |
"WHERE MID > %d AND type NOT IN ('A', 'M') ORDER BY MID",
|
| 375 |
last_article_op_log_mid);
|
| 376 |
|
| 377 |
if (mysql_query(db, sql) != 0)
|
| 378 |
{
|
| 379 |
log_error("Query article log error: %s\n", mysql_error(db));
|
| 380 |
return -3;
|
| 381 |
}
|
| 382 |
if ((rs = mysql_store_result(db)) == NULL)
|
| 383 |
{
|
| 384 |
log_error("Get article log data failed\n");
|
| 385 |
return -3;
|
| 386 |
}
|
| 387 |
|
| 388 |
while ((row = mysql_fetch_row(rs)))
|
| 389 |
{
|
| 390 |
p_article = article_block_find_by_aid(atoi(row[1]));
|
| 391 |
if (p_article == NULL) // related article has not been appended yet
|
| 392 |
{
|
| 393 |
ret = -2;
|
| 394 |
break;
|
| 395 |
}
|
| 396 |
|
| 397 |
// release lock of last section if different from current one
|
| 398 |
if (p_article->sid != last_sid && last_sid != 0)
|
| 399 |
{
|
| 400 |
if ((ret = section_list_rw_unlock(p_section)) < 0)
|
| 401 |
{
|
| 402 |
log_error("section_list_rw_unlock(sid = %d) error\n", p_section->sid);
|
| 403 |
break;
|
| 404 |
}
|
| 405 |
}
|
| 406 |
|
| 407 |
if ((p_section = section_list_find_by_sid(p_article->sid)) == NULL)
|
| 408 |
{
|
| 409 |
log_error("section_list_find_by_sid(%d) error: unknown section, try reloading section config\n", p_article->sid);
|
| 410 |
ret = ERR_UNKNOWN_SECTION; // Unknown section found
|
| 411 |
break;
|
| 412 |
}
|
| 413 |
|
| 414 |
// acquire lock of current section if different from last one
|
| 415 |
if (p_article->sid != last_sid)
|
| 416 |
{
|
| 417 |
if ((ret = section_list_rw_lock(p_section)) < 0)
|
| 418 |
{
|
| 419 |
log_error("section_list_rw_lock(sid = 0) error\n");
|
| 420 |
break;
|
| 421 |
}
|
| 422 |
}
|
| 423 |
|
| 424 |
last_sid = p_article->sid;
|
| 425 |
|
| 426 |
switch (row[2][0])
|
| 427 |
{
|
| 428 |
case 'A': // Add article
|
| 429 |
log_error("Operation type=A should not be found\n");
|
| 430 |
break;
|
| 431 |
case 'D': // Delete article
|
| 432 |
case 'X': // Delete article by Admin
|
| 433 |
p_article->visible = 0;
|
| 434 |
if (p_article->tid == 0)
|
| 435 |
{
|
| 436 |
// Set articles in the topic to be invisible
|
| 437 |
do
|
| 438 |
{
|
| 439 |
p_article = p_article->p_topic_next;
|
| 440 |
p_article->visible = 0;
|
| 441 |
} while (p_article->tid != 0);
|
| 442 |
}
|
| 443 |
break;
|
| 444 |
case 'S': // Restore article
|
| 445 |
p_article->visible = 1;
|
| 446 |
break;
|
| 447 |
case 'L': // Lock article
|
| 448 |
p_article->lock = 1;
|
| 449 |
break;
|
| 450 |
case 'U': // Unlock article
|
| 451 |
p_article->lock = 0;
|
| 452 |
break;
|
| 453 |
case 'M': // Modify article
|
| 454 |
log_error("Operation type=M should not be found\n");
|
| 455 |
break;
|
| 456 |
case 'T': // Move article
|
| 457 |
snprintf(sql, sizeof(sql),
|
| 458 |
"SELECT SID FROM bbs WHERE AID = %d",
|
| 459 |
p_article->aid);
|
| 460 |
|
| 461 |
if (mysql_query(db, sql) != 0)
|
| 462 |
{
|
| 463 |
log_error("Query article error: %s\n", mysql_error(db));
|
| 464 |
ret = -3;
|
| 465 |
break;
|
| 466 |
}
|
| 467 |
if ((rs2 = mysql_store_result(db)) == NULL)
|
| 468 |
{
|
| 469 |
log_error("Get article data failed\n");
|
| 470 |
ret = -3;
|
| 471 |
break;
|
| 472 |
}
|
| 473 |
if ((row2 = mysql_fetch_row(rs2)))
|
| 474 |
{
|
| 475 |
sid_dest = atoi(row2[0]);
|
| 476 |
}
|
| 477 |
else
|
| 478 |
{
|
| 479 |
sid_dest = 0;
|
| 480 |
ret = -4;
|
| 481 |
}
|
| 482 |
mysql_free_result(rs2);
|
| 483 |
|
| 484 |
if (sid_dest > 0 && sid_dest != p_article->sid)
|
| 485 |
{
|
| 486 |
p_section_dest = section_list_find_by_sid(sid_dest);
|
| 487 |
if (p_section_dest == NULL)
|
| 488 |
{
|
| 489 |
ret = ERR_UNKNOWN_SECTION;
|
| 490 |
break;
|
| 491 |
}
|
| 492 |
// acquire lock of dest section
|
| 493 |
if ((ret = section_list_rw_lock(p_section_dest)) < 0)
|
| 494 |
{
|
| 495 |
log_error("section_list_rw_lock(sid = %d) error\n", p_section_dest);
|
| 496 |
break;
|
| 497 |
}
|
| 498 |
// Move topic
|
| 499 |
if ((ret = section_list_move_topic(p_section, p_section_dest, p_article->aid)) < 0)
|
| 500 |
{
|
| 501 |
log_error("section_list_move_topic(src_sid=%d, dest_sid=%d, aid=%d) error (%d), retry in the next loop\n",
|
| 502 |
p_section->sid, p_section_dest->sid, p_article->aid, ret);
|
| 503 |
}
|
| 504 |
// release lock of dest section
|
| 505 |
if (section_list_rw_unlock(p_section_dest) < 0)
|
| 506 |
{
|
| 507 |
log_error("section_list_rw_unlock(sid = %d) error\n", p_section_dest);
|
| 508 |
ret = -1;
|
| 509 |
}
|
| 510 |
}
|
| 511 |
break;
|
| 512 |
case 'E': // Set article as excerption
|
| 513 |
p_article->excerption = 1;
|
| 514 |
break;
|
| 515 |
case 'O': // Unset article as excerption
|
| 516 |
p_article->excerption = 0;
|
| 517 |
break;
|
| 518 |
case 'F': // Set article on top
|
| 519 |
p_article->ontop = 1;
|
| 520 |
break;
|
| 521 |
case 'V': // Unset article on top
|
| 522 |
p_article->ontop = 0;
|
| 523 |
break;
|
| 524 |
case 'Z': // Set article as trnasship
|
| 525 |
p_article->transship = 1;
|
| 526 |
break;
|
| 527 |
default:
|
| 528 |
// log_error("Operation type=%s unknown, mid=%s\n", row[2], row[0]);
|
| 529 |
break;
|
| 530 |
}
|
| 531 |
|
| 532 |
if (ret < 0)
|
| 533 |
{
|
| 534 |
break;
|
| 535 |
}
|
| 536 |
|
| 537 |
// Update MID with last successfully proceeded article_op_log
|
| 538 |
last_article_op_log_mid = atoi(row[0]);
|
| 539 |
}
|
| 540 |
|
| 541 |
// release lock of last section
|
| 542 |
if (last_sid != 0)
|
| 543 |
{
|
| 544 |
if ((ret = section_list_rw_unlock(p_section)) < 0)
|
| 545 |
{
|
| 546 |
log_error("section_list_rw_unlock(sid = %d) error\n", p_section->sid);
|
| 547 |
}
|
| 548 |
}
|
| 549 |
|
| 550 |
mysql_free_result(rs);
|
| 551 |
|
| 552 |
mysql_close(db);
|
| 553 |
|
| 554 |
return ret;
|
| 555 |
}
|
| 556 |
|
| 557 |
int section_list_loader_launch(void)
|
| 558 |
{
|
| 559 |
int pid;
|
| 560 |
int ret;
|
| 561 |
int32_t last_aid;
|
| 562 |
int article_count;
|
| 563 |
int load_count;
|
| 564 |
int last_mid;
|
| 565 |
int i;
|
| 566 |
|
| 567 |
if (section_list_loader_pid != 0)
|
| 568 |
{
|
| 569 |
log_error("section_list_loader already running, pid = %d\n", section_list_loader_pid);
|
| 570 |
return -2;
|
| 571 |
}
|
| 572 |
|
| 573 |
pid = fork();
|
| 574 |
|
| 575 |
if (pid > 0) // Parent process
|
| 576 |
{
|
| 577 |
SYS_child_process_count++;
|
| 578 |
section_list_loader_pid = pid;
|
| 579 |
log_std("Section list loader process (%d) start\n", pid);
|
| 580 |
return 0;
|
| 581 |
}
|
| 582 |
else if (pid < 0) // Error
|
| 583 |
{
|
| 584 |
log_error("fork() error (%d)\n", errno);
|
| 585 |
return -1;
|
| 586 |
}
|
| 587 |
|
| 588 |
// Child process
|
| 589 |
SYS_child_process_count = 0;
|
| 590 |
|
| 591 |
// Detach menu in shared memory
|
| 592 |
detach_menu_shm(p_bbs_menu);
|
| 593 |
free(p_bbs_menu);
|
| 594 |
p_bbs_menu = NULL;
|
| 595 |
|
| 596 |
// Do section data loader periodically
|
| 597 |
while (!SYS_server_exit)
|
| 598 |
{
|
| 599 |
if (SYS_section_list_reload)
|
| 600 |
{
|
| 601 |
SYS_section_list_reload = 0;
|
| 602 |
|
| 603 |
// Load section config
|
| 604 |
if (load_section_config_from_db() < 0)
|
| 605 |
{
|
| 606 |
log_error("load_section_config_from_db() error\n");
|
| 607 |
}
|
| 608 |
else
|
| 609 |
{
|
| 610 |
log_error("Reload section config successfully\n");
|
| 611 |
}
|
| 612 |
}
|
| 613 |
|
| 614 |
// Load section articles
|
| 615 |
last_aid = article_block_last_aid();
|
| 616 |
article_count = article_block_article_count();
|
| 617 |
|
| 618 |
if ((ret = append_articles_from_db(last_aid + 1, 0)) < 0)
|
| 619 |
{
|
| 620 |
log_error("append_articles_from_db(%d, 0) error\n", last_aid + 1);
|
| 621 |
|
| 622 |
if (ret == ERR_UNKNOWN_SECTION)
|
| 623 |
{
|
| 624 |
SYS_section_list_reload = 1; // Force reload section_list
|
| 625 |
}
|
| 626 |
}
|
| 627 |
|
| 628 |
load_count = article_block_article_count() - article_count;
|
| 629 |
|
| 630 |
if (load_count > 0)
|
| 631 |
{
|
| 632 |
log_std("Incrementally load %d articles, last_aid = %d\n", load_count, article_block_last_aid());
|
| 633 |
}
|
| 634 |
|
| 635 |
if (SYS_section_list_reload)
|
| 636 |
{
|
| 637 |
continue;
|
| 638 |
}
|
| 639 |
|
| 640 |
// Load article_op log
|
| 641 |
last_mid = last_article_op_log_mid;
|
| 642 |
|
| 643 |
if ((ret = apply_article_op_log_from_db()) < 0)
|
| 644 |
{
|
| 645 |
log_error("apply_article_op_log_from_db() error\n");
|
| 646 |
|
| 647 |
if (ret == ERR_UNKNOWN_SECTION)
|
| 648 |
{
|
| 649 |
SYS_section_list_reload = 1; // Force reload section_list
|
| 650 |
}
|
| 651 |
}
|
| 652 |
|
| 653 |
if (last_article_op_log_mid > last_mid)
|
| 654 |
{
|
| 655 |
log_std("Proceeded %d article logs, last_mid = %d\n", last_article_op_log_mid - last_mid, last_article_op_log_mid);
|
| 656 |
}
|
| 657 |
|
| 658 |
if (SYS_section_list_reload)
|
| 659 |
{
|
| 660 |
continue;
|
| 661 |
}
|
| 662 |
|
| 663 |
for (i = 0; i < SECTION_LIST_LOAD_INTERVAL && !SYS_server_exit && !SYS_section_list_reload; i++)
|
| 664 |
{
|
| 665 |
sleep(1);
|
| 666 |
}
|
| 667 |
}
|
| 668 |
|
| 669 |
// Child process exit
|
| 670 |
|
| 671 |
// Detach data pools shm
|
| 672 |
detach_section_list_shm();
|
| 673 |
detach_article_block_shm();
|
| 674 |
detach_trie_dict_shm();
|
| 675 |
|
| 676 |
log_std("Section list loader process exit normally\n");
|
| 677 |
log_end();
|
| 678 |
|
| 679 |
section_list_loader_pid = 0;
|
| 680 |
|
| 681 |
_exit(0);
|
| 682 |
|
| 683 |
return 0;
|
| 684 |
}
|
| 685 |
|
| 686 |
int section_list_loader_reload(void)
|
| 687 |
{
|
| 688 |
if (section_list_loader_pid == 0)
|
| 689 |
{
|
| 690 |
log_error("section_list_loader not running\n");
|
| 691 |
return -2;
|
| 692 |
}
|
| 693 |
|
| 694 |
if (kill(section_list_loader_pid, SIGHUP) < 0)
|
| 695 |
{
|
| 696 |
log_error("Send SIGTERM signal failed (%d)\n", errno);
|
| 697 |
return -1;
|
| 698 |
}
|
| 699 |
|
| 700 |
return 0;
|
| 701 |
}
|
| 702 |
|
| 703 |
int query_section_articles(SECTION_LIST *p_section, int32_t page_id, ARTICLE *p_articles[], int32_t *p_article_count)
|
| 704 |
{
|
| 705 |
ARTICLE *p_article;
|
| 706 |
ARTICLE *p_next_page_first_article;
|
| 707 |
int ret = 0;
|
| 708 |
|
| 709 |
if (p_section == NULL || p_articles == NULL || p_article_count == NULL)
|
| 710 |
{
|
| 711 |
log_error("query_section_articles() NULL pointer error\n");
|
| 712 |
return -1;
|
| 713 |
}
|
| 714 |
|
| 715 |
// acquire lock of section
|
| 716 |
if ((ret = section_list_rd_lock(p_section)) < 0)
|
| 717 |
{
|
| 718 |
log_error("section_list_rd_lock(sid = %d) error\n", p_section->sid);
|
| 719 |
return -2;
|
| 720 |
}
|
| 721 |
|
| 722 |
if (page_id < 0 || page_id >= p_section->page_count)
|
| 723 |
{
|
| 724 |
log_error("Invalid page_id=%d, not in range [0, %d)\n", page_id, p_section->page_count);
|
| 725 |
ret = -3;
|
| 726 |
}
|
| 727 |
else
|
| 728 |
{
|
| 729 |
ret = page_id;
|
| 730 |
p_article = p_section->p_page_first_article[page_id];
|
| 731 |
p_next_page_first_article =
|
| 732 |
(page_id == p_section->page_count - 1 ? p_section->p_article_head : p_section->p_page_first_article[page_id + 1]);
|
| 733 |
*p_article_count = 0;
|
| 734 |
|
| 735 |
do
|
| 736 |
{
|
| 737 |
if (p_article->visible)
|
| 738 |
{
|
| 739 |
p_articles[*p_article_count] = p_article;
|
| 740 |
(*p_article_count)++;
|
| 741 |
}
|
| 742 |
p_article = p_article->p_next;
|
| 743 |
} while (p_article != p_next_page_first_article && (*p_article_count) <= BBS_article_limit_per_page);
|
| 744 |
|
| 745 |
if (*p_article_count != (page_id < p_section->page_count - 1 ? BBS_article_limit_per_page : p_section->last_page_visible_article_count))
|
| 746 |
{
|
| 747 |
log_error("Inconsistent visible article count %d detected in section %d page %d\n", *p_article_count, p_section->sid, page_id);
|
| 748 |
}
|
| 749 |
}
|
| 750 |
|
| 751 |
// release lock of section
|
| 752 |
if (section_list_rd_unlock(p_section) < 0)
|
| 753 |
{
|
| 754 |
log_error("section_list_rd_unlock(sid = %d) error\n", p_section->sid);
|
| 755 |
ret = -2;
|
| 756 |
}
|
| 757 |
|
| 758 |
return ret;
|
| 759 |
}
|
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