/******************************************************************************** * Copyright: (C) 2020 LingYun IoT System Studio * All rights reserved. * * Filename: database.c * Description: This library used to operate blob packet in sqlite database. * * Version: 1.0.0(2020年05月13日) * Author: Guo Wenxue * ChangeLog: 1, Release initial version on "2020年05月13日 12时14分23秒" * ********************************************************************************/ #include #include #include #include #include "database.h" #include "logger.h" /* Blob packet table name */ #define TABLE_NAME "PackTable" /* Use static global handler here in order to simplify the API, * But it will make this library not thread safe */ static sqlite3 *s_clidb = NULL; /* description: open or create sqlite database if not exist * input args: * $db_file: sqlite database file name * return value: <0: failure 0:ok * */ int database_init(const char *db_file) { char sql[SQL_COMMAND_LEN]={0}; char *errmsg = NULL; if( !db_file ) { log_error("%s() Invalid input arguments\n", __func__); return -1; } /*+------------------------------------------+ *| database already exist, just open it | *+------------------------------------------+*/ if( 0==access(db_file, F_OK) ) { if( SQLITE_OK != sqlite3_open(db_file, &s_clidb) ) { log_error("open database file '%s' failure\n", db_file); return -2; } log_info("open database file '%s' ok\n", db_file); return 0; } /*+-----------------------------------------+ *| database not exist, create and init it | *+-----------------------------------------+*/ if( SQLITE_OK != sqlite3_open(db_file, &s_clidb) ) { log_error("create database file '%s' failure\n", db_file); return -2; } /* SQLite continues without syncing as soon as it has handed data off to the operating system */ sqlite3_exec(s_clidb, "pragma synchronous = OFF; ", NULL, NULL, NULL); /* enable full auto vacuum, Auto increase/decrease */ sqlite3_exec(s_clidb, "pragma auto_vacuum = 2 ; ", NULL, NULL, NULL); /* Create firehost table in the database */ snprintf(sql, sizeof(sql), "CREATE TABLE %s(packet BLOB);", TABLE_NAME); if( SQLITE_OK != sqlite3_exec(s_clidb, sql, NULL, NULL, &errmsg) ) { log_error("create data_table in database file '%s' failure: %s\n", db_file, errmsg); sqlite3_free(errmsg); /* free errmsg */ sqlite3_close(s_clidb); /* close databse */ unlink(db_file); /* remove database file */ return -3; } log_info("create and init database file '%s' ok\n", db_file); return 0; } /* description: close sqlite database handler * return value: none */ void database_term(void) { log_warn("close sqlite database now\n"); sqlite3_close(s_clidb); return ; } /* description: push a blob packet into database * input args: * $pack: blob packet data address * $size: blob packet data bytes * return value: <0: failure 0:ok */ int database_push_packet(void *pack, int size) { char sql[SQL_COMMAND_LEN]={0}; int rv = 0; sqlite3_stmt *stat = NULL; if( !pack || size<=0 ) { log_error("%s() Invalid input arguments\n", __func__); return -1; } if( ! s_clidb ) { log_error("sqlite database not opened\n"); return -2; } snprintf(sql, sizeof(sql), "INSERT INTO %s(packet) VALUES(?)", TABLE_NAME); rv = sqlite3_prepare_v2(s_clidb, sql, -1, &stat, NULL); if(SQLITE_OK!=rv || !stat) { log_error("blob add sqlite3_prepare_v2 failure\n"); rv = -2; goto OUT; } if( SQLITE_OK != sqlite3_bind_blob(stat, 1, pack, size, NULL) ) { log_error("blob add sqlite3_bind_blob failure\n"); rv = -3; goto OUT; } rv = sqlite3_step(stat); if( SQLITE_DONE!=rv && SQLITE_ROW!=rv ) { log_error("blob add sqlite3_step failure\n"); rv = -4; goto OUT; } OUT: sqlite3_finalize(stat); if( rv < 0 ) log_error("add new blob packet into database failure, rv=%d\n", rv); else log_info("add new blob packet into database ok\n"); return rv; } /* description: pop the first blob packet from database * input args: * $pack: blob packet output buffer address * $size: blob packet output buffer size * $byte: blob packet bytes * return value: <0: failure 0:ok */ int database_pop_packet(void *pack, int size, int *bytes) { char sql[SQL_COMMAND_LEN]={0}; int rv = 0; sqlite3_stmt *stat = NULL; const void *blob_ptr; if( !pack || size<=0 ) { log_error("%s() Invalid input arguments\n", __func__); return -1; } if( ! s_clidb ) { log_error("sqlite database not opened\n"); return -2; } /* Only query the first packet record */ snprintf(sql, sizeof(sql), "SELECT packet FROM %s WHERE rowid = (SELECT rowid FROM %s LIMIT 1);", TABLE_NAME, TABLE_NAME); rv = sqlite3_prepare_v2(s_clidb, sql, -1, &stat, NULL); if(SQLITE_OK!=rv || !stat) { log_error("firehost sqlite3_prepare_v2 failure\n"); rv = -3; goto out; } rv = sqlite3_step(stat); if( SQLITE_DONE!=rv && SQLITE_ROW!=rv ) { log_error("firehost sqlite3_step failure\n"); rv = -5; goto out; } /* 1rd argument<0> means first segement is packet */ blob_ptr = sqlite3_column_blob(stat, 0); if( !blob_ptr ) { rv = -6; goto out; } *bytes = sqlite3_column_bytes(stat, 0); if( *bytes > size ) { log_error("blob packet bytes[%d] larger than bufsize[%d]\n", *bytes, size); *bytes = 0; rv = -1; } memcpy(pack, blob_ptr, *bytes); rv = 0; out: sqlite3_finalize(stat); return rv; } /* description: remove the first blob packet from database * input args: none * return value: <0: failure 0:ok */ int database_del_packet(void) { char sql[SQL_COMMAND_LEN]={0}; char *errmsg = NULL; if( ! s_clidb ) { log_error("sqlite database not opened\n"); return -2; } /* remove packet from db */ memset(sql, 0, sizeof(sql)); snprintf(sql, sizeof(sql), "DELETE FROM %s WHERE rowid = (SELECT rowid FROM %s LIMIT 1);", TABLE_NAME, TABLE_NAME); if( SQLITE_OK != sqlite3_exec(s_clidb, sql, NULL, 0, &errmsg) ) { log_error("delete first blob packet from database failure: %s\n", errmsg); sqlite3_free(errmsg); return -2; } log_warn("delete first blob packet from database ok\n"); /* Vacuum the database */ sqlite3_exec(s_clidb, "VACUUM;", NULL, 0, NULL); return 0; }