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var fs = require("fs");
function berkeleydb(fn) {
var db;
var bdb_lib = require("berkeleydb");
var dbenv = new bdb_lib.DbEnv();
var bdb_status = dbenv.open("./search/db/env");
if (bdb_status) {
console.log("open dbenv failed:", bdb_status);
process.exit();
}
fn = "./" + fn + ".db";
function exitHandler(options, err) {
if (db) db.close();
// if (options.cleanup) console.log('clean');
if (err) console.log(err.stack);
if (options.exit) process.exit();
}
// do something when app is closing
process.on("exit", exitHandler.bind(null, { cleanup: true }));
// catches ctrl+c event
process.on("SIGINT", exitHandler.bind(null, { exit: true }));
// catches "kill pid" (for example: nodemon restart)
process.on("SIGUSR1", exitHandler.bind(null, { exit: true }));
process.on("SIGUSR2", exitHandler.bind(null, { exit: true }));
//catches uncaught exceptions
process.on("uncaughtException", exitHandler.bind(null, { exit: true }));
function open(fn) {
if (db) db.close();
var _db = new bdb_lib.Db(dbenv);
var bdb_status = _db.open(fn);
if (bdb_status) {
console.log("open " + fn + " failed:", bdb_status);
process.exit();
}
db = _db;
}
open(fn);
return {
put: function (term, serialized) {
db.put(term, serialized);
},
get: function (term) {
return db.get(term);
},
};
}
function jsondb(fn) {
let db;
fn = "./" + fn + ".db";
function exitHandler(options, err) {
if (db) {
fs.writeFileSync(fn, JSON.stringify(db, false, 0));
}
// if (options.cleanup) console.log('clean');
if (err) console.log(err.stack);
if (options.exit) process.exit();
}
// do something when app is closing
process.on("exit", exitHandler.bind(null, { cleanup: true }));
// catches ctrl+c event
process.on("SIGINT", exitHandler.bind(null, { exit: true }));
// catches "kill pid" (for example: nodemon restart)
process.on("SIGUSR1", exitHandler.bind(null, { exit: true }));
process.on("SIGUSR2", exitHandler.bind(null, { exit: true }));
//catches uncaught exceptions
process.on("uncaughtException", exitHandler.bind(null, { exit: true }));
if (fs.existsSync(fn)) {
try {
db = JSON.parse(fs.readFileSync(fn));
} catch (err) {
console.error("couldn't read " + fn);
process.exit();
}
} else {
db = {};
}
return {
put: function (term, serialized) {
db[term] = serialized;
},
get: function (term) {
return db[term];
},
};
}
module.exports = process.env.USE_BDB === "true" ? berkeleydb : jsondb;
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