/
database-connection.ts
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/
database-connection.ts
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/*
This file is part of botten-nappet -- a Twitch bot and streaming tool.
<https://joelpurra.com/projects/botten-nappet/>
Copyright (c) 2018 Joel Purra <https://joelpurra.com/>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
import Bluebird from "bluebird";
import {
assert,
} from "check-types";
import {
connect,
} from "camo";
import PinoLogger from "@botten-nappet/shared/util/pino-logger";
interface ICamoDatabaseConnection {
// TODO: update and/or patch @types/camo.
close: () => void;
}
export default class DatabaseConnection {
public autocompactionInterval: number;
private database: ICamoDatabaseConnection | null;
private uri: string;
private logger: PinoLogger;
constructor(logger: PinoLogger, uri: string) {
assert.hasLength(arguments, 2);
assert.equal(typeof logger, "object");
assert.equal(typeof uri, "string");
assert(uri.length > 0);
assert(uri.startsWith("nedb://"));
this.logger = logger.child("DatabaseConnection");
this.uri = uri;
this.database = null;
// NOTE: non-even minute/second interval, just because I feel like it.
this.autocompactionInterval = 63912;
}
public async connect() {
assert.hasLength(arguments, 0);
assert.equal(this.database, null);
const db = await connect(this.uri);
this.database = db as ICamoDatabaseConnection;
return undefined;
}
public async disconnect() {
assert.hasLength(arguments, 0);
assert.not.equal(this.database, null);
// NOTE: hack to reach NeDB through Camo.
const collections = this.database._collections;
const dbs = Object.values(collections);
// NOTE: flush data to disk.
// https://github.com/louischatriot/nedb#persistence
// NOTE: could be done on a timer, but it's unclear when the database/collection has been loaded by camo.
/* tslint:disable max-line-length */
// https://github.com/scottwrobinson/camo/blob/3acde553b37ec7d2161a20424fa1975243f96179/lib/clients/nedbclient.js#L335-L337
/* tslint:enable max-line-length */
await Bluebird.map(dbs, (db) => new Promise((resolve, reject) => {
// NOTE: can't seem to find any error event.
db.once("compaction.done", () => resolve());
try {
db.persistence.compactDatafile();
} catch (error) {
reject(error);
}
}))
.tap(() => {
this.logger.info("database written to disk", "disconnect");
})
.tapCatch((error) => {
this.logger.error(error, "disconnect");
});
return this.database!.close();
}
}