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// 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.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
import {DatabaseConnection} from './DatabaseConnection';
import {DatabaseQueryError} from './DatabaseQueryError';
import {getInstance, getApplicationLogger} from './instance';
import * as MySQL from 'mysql';
import {Readable} from 'stream';
import {Query} from './Query';
import { StartTransactionQuery } from './private/StartTransactionQuery';
import { CommitQuery } from './private/CommitQuery';
import { RollbackQuery } from './private/RollbackQuery';
const DEFAULT_HIGH_WATERMARK: number = 512; // in number of result objects
const startTransactionQuery: Query = new StartTransactionQuery();
const commitQuery: Query = new CommitQuery();
const rollbackQuery: Query = new RollbackQuery();
export class MySQLConnection extends DatabaseConnection {
private transaction: boolean;
private _opened: boolean;
public constructor(connection: MySQL.PoolConnection, instantiationStack: string, isReadOnly: boolean = true) {
super(connection, isReadOnly, instantiationStack);
this._opened = true;
this.transaction = false;
connection.config.queryFormat = function(query: string, values: any) {
if (!values) return query;
return query.replace(/:(\w+)/g, function(this: any, txt: string, key: string): string {
// eslint-disable-next-line no-prototype-builtins
if (values.hasOwnProperty(key)) {
return this.escape(values[key]);
}
return txt;
}.bind(this));
};
}
public isTransaction(): boolean {
return this.transaction;
}
public isOpen(): boolean {
return this._opened;
}
protected _query(query: string, params?: any): Promise<any> {
return new Promise((resolve, reject) => {
let queryObject: MySQL.Query = this.getAPI().query({
sql: query,
timeout: this.getTimeout()
}, params, (error: MySQL.MysqlError, results: any) => {
if (error) {
return reject(new DatabaseQueryError(queryObject.sql, error));
}
return resolve(results);
});
getApplicationLogger().trace(queryObject.sql);
});
}
protected _stream(query: string, params?: any, streamOptions?: any): Readable {
if (!streamOptions) {
streamOptions = {};
}
Eif (!streamOptions.highWatermark) {
streamOptions.highWatermark = DEFAULT_HIGH_WATERMARK;
}
const queryObject: MySQL.Query = this.getAPI().query({
sql: query,
timeout: this.getTimeout()
}, params);
getApplicationLogger().trace(queryObject.sql);
return queryObject.stream(streamOptions);
}
public startTransaction(): Promise<void> {
if (this.isReadOnly()) {
return Promise.reject(new Error('A readonly connection cannot start a transaction.'));
}
if (this.isTransaction()) {
return Promise.reject(new Error('Connection is already in a transaction.'));
}
this.transaction = true;
return new Promise<void>((resolve, reject) => {
this.query(startTransactionQuery).then(() => {
resolve();
}).catch((ex) => {
this.transaction = false;
getApplicationLogger().error(ex);
reject(ex);
});
});
}
public endTransaction(requiresRollback: boolean = false): Promise<void> {
return (requiresRollback) ? this.rollback() : this.commit();
}
public rollback(): Promise<void> {
if (!this.isTransaction()) {
return Promise.reject(new Error('Cannot rollback when there is no active transaction.'));
}
return new Promise<void>((resolve, reject) => {
this.query(rollbackQuery).then(() => {
this.transaction = false
resolve();
}).catch((ex: any) => {
getApplicationLogger().error(ex);
reject(ex);
});
});
}
public commit(): Promise<void> {
if (!this.isTransaction()) {
return Promise.reject(new Error('Cannot commit when there is no active transaction.'));
}
return new Promise<void>((resolve, reject) => {
this.query(commitQuery).then(() => {
this.transaction = false;
resolve();
}).catch((ex: any) => {
getApplicationLogger().error(ex);
reject(ex);
});
});
}
protected _close(forceClose: boolean): Promise<void> {
if (!forceClose && this.isTransaction()) {
return Promise.reject(new Error('Cannot close a connection while there is an active transaction. Use commit or rollback first.'));
}
this._opened = false;
return new Promise<void>((resolve, reject) => {
let rollbackPromise: Promise<void> = null;
if (forceClose) {
if (this.isTransaction()) {
rollbackPromise = this.rollback();
}
else {
rollbackPromise = Promise.resolve();
}
}
else {
rollbackPromise = Promise.resolve();
}
rollbackPromise.then(() => {
this.getAPI().release();
resolve();
}).catch((error: any) => {
getInstance().getLogger().error(error);
this.getAPI().release();
resolve();
});
});
}
}
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