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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 {IDatabaseConnection} from './IDatabaseConnection';
import {getInstance} from './instance';
import {Readable} from 'stream';
import { Query } from './Query';
export class ManagedDatabaseConnection implements IDatabaseConnection {
private _connection: IDatabaseConnection;
/**
* When true, this class will not close the connection or
* allow transaction starts or ends. Methods for these actions
* will be a no-op.
*/
private _managed: boolean;
private _requiresWrite: boolean;
private _instantionStack: string;
public constructor(requiresWrite: boolean = false) {
this._managed = false;
this._requiresWrite = requiresWrite;
this._instantionStack = new Error().stack;
}
public setConnection(connection: IDatabaseConnection): void {
if (this._connection) {
// Store original connection because of async,
// but we don't really need to wait for the async operations
// to complete to set the new connection object.
const oldConnection: IDatabaseConnection = this._connection;
if (oldConnection.isTransaction()) {
getInstance().getLogger().warn('Rolling back a transaction because setConnection was called on a ManagedDatabaseConnection in a transaction in progress.');
getInstance().getLogger().trace(new Error('Stacktrace'));
oldConnection.rollback().then(() => {
oldConnection.close();
}).catch((error: any) => {
getInstance().getLogger().error(error);
oldConnection.close(true);
});
}
else {
oldConnection.close();
}
}
this._connection = connection;
this._managed = true;
}
public isWriteRequired(): boolean {
return this._requiresWrite;
}
public isManaged(): boolean {
return this._managed;
}
public hasConnection(): boolean {
return !!this._connection;
}
public setInstantiationStack(stack: string): void {
if (this.hasConnection()) {
this._connection.setInstantiationStack(stack);
}
else {
this._instantionStack = stack;
}
}
public getInstantiationStack(): string {
if (this.hasConnection()) {
return this._connection.getInstantiationStack();
}
else {
return this._instantionStack;
}
}
public isReadOnly(): boolean {
if (this.hasConnection()) {
return this._connection.isReadOnly();
}
else {
return true;
}
}
public setTimeout(timeout: number): void {
this._getConnection().then((connection: IDatabaseConnection) => {
connection.setTimeout(timeout);
});
}
public getTimeout(): number {
if (this.hasConnection()) {
return this._connection.getTimeout();
}
else {
return null;
}
}
public query(query: string | Query, params?: any): Promise<any> {
return new Promise<any>((resolve, reject) => {
this._getConnection().then((connection: IDatabaseConnection) => {
connection.query(query, params).then(resolve).catch(reject);
}).catch(reject);
})
}
public stream(query: string | Query, params?: any, streamOptions?: any): Readable {
throw new Error('stream is not supported on Managed Connections');
}
public close(forceClose?: boolean): Promise<void> {
return new Promise<void>((resolve, reject) => {
if (this.hasConnection() && !this.isManaged()) {
this._connection.close(forceClose).then(() => {
this._connection = null;
this._managed = false;
resolve();
}).catch(reject);
}
else {
resolve();
}
});
}
public startTransaction(): Promise<void> {
return new Promise<void>((resolve, reject) => {
this._getConnection().then((connection: IDatabaseConnection) => {
if (!this.isManaged()) {
connection.startTransaction().then(resolve).catch(reject);
}
else {
resolve();
}
}).catch(reject);
});
}
public isTransaction(): boolean {
if (this.hasConnection()) {
return this._connection.isTransaction();
}
else {
return false;
}
}
public commit(): Promise<void> {
return new Promise<void>((resolve, reject) => {
this._getConnection().then((connection: IDatabaseConnection) => {
if (!this.isManaged()) {
connection.commit().then(resolve).catch(reject);
}
else {
resolve();
}
}).catch(reject);
});
}
public rollback(): Promise<void> {
return new Promise<void>((resolve, reject) => {
this._getConnection().then((connection: IDatabaseConnection) => {
if (!this.isManaged()) {
connection.rollback().then(resolve).catch(reject);
}
else {
resolve();
}
}).catch(reject);
});
}
private _getConnection(): Promise<IDatabaseConnection> {
return new Promise<IDatabaseConnection>((resolve, reject) => {
let promise: Promise<IDatabaseConnection> = null;
let setInstantationStack: boolean = false;
if (!this._connection) {
promise = getInstance().getDB().getConnection(this._requiresWrite);
setInstantationStack = true;
}
else {
promise = Promise.resolve(this._connection);
}
promise.then((connection: IDatabaseConnection) => {
if (setInstantationStack) {
connection.setInstantiationStack(this._instantionStack);
}
this._connection = connection;
resolve(this._connection);
}).catch(reject);
});
}
public getAPI(): any {
if (this.hasConnection()) {
return this._connection.getAPI();
}
else {
return null;
}
}
}
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