99 lines
2.5 KiB
Go
99 lines
2.5 KiB
Go
package main
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import (
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"database/sql"
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_ "github.com/go-sql-driver/mysql"
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"log"
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"os"
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"time"
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)
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// db stores the connection to the database
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var db *sql.DB
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// DSNGenerator returns DSN filed with values from environment
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func DSNGenerator() string {
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db_user := "chocominer"
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db_password := "chocominer"
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db_host := ""
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db_db := "chocominer"
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if v, exists := os.LookupEnv("MYSQL_HOST"); exists {
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db_host = "tcp(" + v + ":"
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if p, exists := os.LookupEnv("MYSQL_PORT"); exists {
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db_host += p + ")"
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} else {
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db_host += "3306)"
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}
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}
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if v, exists := os.LookupEnv("MYSQL_PASSWORD"); exists {
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db_password = v
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} else if v, exists := os.LookupEnv("MYSQL_ROOT_PASSWORD"); exists {
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db_user = "root"
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db_password = v
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}
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if v, exists := os.LookupEnv("MYSQL_USER"); exists {
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db_user = v
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}
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if v, exists := os.LookupEnv("MYSQL_DATABASE"); exists {
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db_db = v
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}
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return db_user + ":" + db_password + "@" + db_host + "/" + db_db
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}
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// DBInit establishes the connection to the database
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func DBInit(dsn string) (err error) {
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if db, err = sql.Open("mysql", dsn+"?parseTime=true&foreign_key_checks=1"); err != nil {
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return
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}
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_, err = db.Exec(`SET SESSION sql_mode = 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO';`)
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for i := 0; err != nil && i < 45; i += 1 {
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if _, err = db.Exec(`SET SESSION sql_mode = 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO';`); err != nil && i <= 45 {
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log.Println("An error occurs when trying to connect to DB, will retry in 2 seconds: ", err)
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time.Sleep(2 * time.Second)
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}
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}
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return
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}
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// DBCreate creates all necessary tables used by the package
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func DBCreate() error {
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if _, err := db.Exec(`
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CREATE TABLE IF NOT EXISTS chunks(
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id_chunk INTEGER NOT NULL PRIMARY KEY AUTO_INCREMENT,
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time TIMESTAMP NOT NULL,
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username VARCHAR(255) NOT NULL,
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chunk VARCHAR(255) NOT NULL UNIQUE,
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proof VARBINARY(255) NOT NULL
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) DEFAULT CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;
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`); err != nil {
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return err
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}
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return nil
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}
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// DBClose closes the connection to the database
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func DBClose() error {
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return db.Close()
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}
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func DBPrepare(query string) (*sql.Stmt, error) {
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return db.Prepare(query)
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}
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func DBQuery(query string, args ...interface{}) (*sql.Rows, error) {
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return db.Query(query, args...)
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}
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func DBExec(query string, args ...interface{}) (sql.Result, error) {
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return db.Exec(query, args...)
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}
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func DBQueryRow(query string, args ...interface{}) *sql.Row {
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return db.QueryRow(query, args...)
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}
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