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const { EventEmitter } = require('events');
const { randomBytes } = require('crypto');
const { Database } = require('sqlite3');
const { Client } = require('pg');
const { queue, waterfall } = require('async');
const iferr = require('iferr');
class PubKeyStoreSQL extends EventEmitter {
constructor(options, cb) {
super();
this._options = Object.assign({
db_type: 'sqlite',
busy_wait: 1000,
check_interval: 1000
}, options);
this._open = false;
// We need to queue queries on a db connection:
// https://github.com/mapbox/node-sqlite3/issues/304
// Alternative would be to create a separate connection
// for each query. The calling application can still do
// this if required (to achieve more parallelism) by
// creating many keystores.
this._queue = queue((task, cb) => {
if (!this._open) {
return cb(new Error('not_open'));
}
task(cb);
});
waterfall([
cb => {
let db;
switch (this._options.db_type) {
case 'sqlite':
db = new Database(this._options.db_filename,
this._options.db_mode);
db.on('open', err => cb(err, db));
this._true = 1;
this._false = 0;
this._busy_code = 'SQLITE_BUSY';
break;
case 'pg':
db = new Client(this._options.db);
db.connect(err => cb(err, db));
this._true = true;
this._false = false;
this._busy_code = '40001';
break;
default:
cb(new Error(`invalid database type: ${this._options.db_type}`));
break;
}
},
(db, cb) => {
this._open = true;
this._db = db;
if (this._options.no_changes) {
return cb();
}
this._get(
'SELECT id FROM pub_keys ORDER BY id DESC LIMIT 1',
[],
iferr(cb, r => {
if (r !== undefined) {
this._last_id = r.id;
}
db.on('error', this.emit.bind(this, 'error'));
this._check();
cb();
}));
}
], iferr(err => this.close(() => cb(err)), () => cb(null, this)));
}
_ifopen(cb) {
return (...args) => !this._open || cb.call(this, ...args);
}
_check() {
this._check_timeout = setTimeout(this._ifopen(() => {
this._queue.push(this._ifopen(cb => {
let sql = 'SELECT id, uri, deleted FROM pub_keys';
let args = [];
if (this._last_id !== undefined) {
sql += ' WHERE id > $1';
args.push(this._last_id);
}
sql += ' ORDER BY id';
this._all(
sql,
args,
iferr(cb, r => {
/* jshint expr: true */
this._options.verbose && console.log('database change', r);
for (let { id, uri, deleted } of r) {
this.emit('change', uri, id.toString(), deleted === this._true);
this._last_id = id;
}
cb();
}));
}), this._busy(iferr(this.emit.bind(this, 'error'),
this._ifopen(this._check)),
this._ifopen(this._check)));
}), this._options.check_interval);
}
close(cb) {
this._queue.push(cb => {
waterfall([
cb => {
clearTimeout(this._check_timeout);
cb();
},
cb => {
switch (this._options.db_type) {
case 'sqlite':
this._db.close(cb);
break;
case 'pg':
this._db.end(cb);
break;
}
},
cb => {
this._open = false;
cb();
}
], cb);
}, cb);
}
get_pub_key_by_uri(uri, cb) {
this._queue.push(cb => {
this._get(
'SELECT pub_key, issuer_id, id, deleted FROM pub_keys WHERE uri = $1 ORDER BY id DESC LIMIT 1;',
[uri],
iferr(cb, r => {
if ((r === undefined) || r.deleted) {
return cb(null, null);
}
cb(null, JSON.parse(r.pub_key), r.issuer_id, r.id.toString());
}));
}, this._busy(cb, this.get_pub_key_by_uri.bind(this, uri, cb)));
}
get_pub_key_by_issuer_id(issuer_id, cb) {
const b = this._busy(cb, this.get_pub_key_by_issuer_id.bind(this, issuer_id, cb));
this._in_transaction(b, cb => {
this._queue.unshift(cb => {
this._get(
'SELECT uri FROM pub_keys WHERE issuer_id = $1;',
[issuer_id],
iferr(cb, r => {
if (r === undefined) {
return cb(null, null);
}
this._get(
'SELECT pub_key, issuer_id, id, deleted FROM pub_keys WHERE uri = $1 ORDER BY id DESC LIMIT 1;',
[r.uri],
iferr(cb, r2 => {
if (r2.deleted || (r2.issuer_id !== issuer_id)) {
return cb(null, null);
}
cb(null, JSON.parse(r2.pub_key), r.uri, r2.id.toString());
}));
}));
}, cb);
});
}
get_issuer_id(uri, cb) {
this._queue.push(cb => {
this._get(
'SELECT issuer_id, id, deleted FROM pub_keys WHERE uri = $1 ORDER BY id DESC LIMIT 1;',
[uri],
iferr(cb, r => {
if ((r === undefined) || r.deleted) {
return cb(null, null);
}
cb(null, r.issuer_id, r.id.toString());
}));
}, this._busy(cb, this.get_issuer_id.bind(this, uri, cb)));
}
get_uris(cb) {
this._queue.push(cb => {
this._all(
'SELECT uri FROM (SELECT uri, deleted, row_number() OVER(PARTITION BY uri ORDER BY id DESC) AS rn FROM pub_keys) sub WHERE rn = 1 AND NOT deleted;',
[],
iferr(cb, r => {
cb(null, r.map(row => row.uri));
}));
}, this._busy(cb, this.get_uris.bind(this, cb)));
}
add_pub_key(uri, pub_key, options, cb) {
if (typeof options === 'function')
{
cb = options;
options = {};
}
options = options || {};
cb = cb || function () { return undefined; };
if ((uri === null) || (uri === undefined)) {
return cb(new Error('invalid_uri'));
}
const issuer_id = randomBytes(64).toString('hex');
const b = this._busy(cb, this.add_pub_key.bind(this, uri, pub_key, cb));
this._in_transaction(b, cb => {
this._queue.unshift(cb => {
this._get(
'SELECT deleted FROM pub_keys WHERE uri = $1 ORDER BY id DESC LIMIT 1;',
[uri],
iferr(cb, r => {
if (this._options.no_updates &&
!options.allow_update &&
(r !== undefined) &&
!r.deleted) {
const err = new Error('already exists');
err.statusCode = 409;
err.error = 'conflict';
return cb(err);
}
this._run(
'INSERT INTO pub_keys (uri, issuer_id, pub_key, deleted) VALUES ($1, $2, $3, $4)',
[uri, issuer_id, JSON.stringify(pub_key), this._false],
iferr(cb, () => {
this._get(
'SELECT id FROM pub_keys WHERE issuer_id = $1;',
[issuer_id],
iferr(cb, r => {
cb(null, issuer_id, r.id.toString());
}));
}));
}));
}, cb);
});
}
remove_pub_key(uri, cb) {
if ((uri === null) || (uri === undefined)) {
return cb(new Error('invalid_uri'));
}
const b = this._busy(cb, this.remove_pub_key.bind(this, uri, cb));
this._in_transaction(b, cb => {
this._queue.unshift(cb => {
this._get(
'SELECT deleted FROM pub_keys WHERE uri = $1 ORDER BY id DESC LIMIT 1;',
[uri],
iferr(cb, r => {
if ((r === undefined) || r.deleted) {
return cb();
}
this._run(
'INSERT INTO pub_keys (uri, deleted) VALUES ($1, $2)',
[uri, this._true],
cb);
}));
}, cb);
});
}
create(cb) {
/* jshint expr: true */
!cb || cb();
}
destroy(cb) {
this._queue.push(cb => {
this._run('DELETE FROM pub_keys', [], cb);
}, this._busy(iferr(cb, this.close.bind(this, cb)),
this.destroy.bind(this, cb)));
}
replicate(opts, cb) {
/* jshint expr: true */
(typeof opts !== 'function') || (cb = opts);
cb = cb || (() => {});
if (!this._open) {
return cb(new Error('not_open'));
}
this.emit('replicated', cb => cb());
cb();
}
deploy(cb) {
/* jshint expr: true */
!cb || cb();
}
_busy(f, retry, block) {
return (err, ...args) => {
if (err && (err.code === this._busy_code)) {
if (block) {
return this._queue.unshift(cb => setTimeout(cb, this._options.busy_wait),
retry);
}
return setTimeout(retry, this._options.busy_wait);
}
f(err, ...args);
};
}
_end_transaction(cb) {
let f = (err, ...args) => {
if (err) {
return this._queue.unshift(cb => {
this._run('ROLLBACK',
[],
cb);
}, this._busy(err2 => cb(err2 || err, ...args),
f.bind(this, err, ...args),
true));
}
const cb2 = err => cb(err, ...args);
this._queue.unshift(cb => {
this._run('END TRANSACTION',
[],
cb);
}, this._options.db_type === 'sqlite' ?
this._busy(cb2,
f.bind(this, err, ...args),
true) :
cb2);
};
return f;
}
_in_transaction(cb, f) {
let isolation_level;
switch (this._options.db_type) {
case 'sqlite':
isolation_level = ''; // SQLite transactions are serializable
break;
case 'pg':
isolation_level = 'ISOLATION LEVEL SERIALIZABLE';
break;
}
this._queue.push(cb2 =>
this._run(`BEGIN TRANSACTION ${isolation_level}`, [], cb2),
iferr(cb, () => f(this._end_transaction(cb))));
}
// Note: $1, $2 placeholders in SQL statements are PostgreSQL syntax.
// However, as long as they appear _in order_ (i.e. never $2 before $1)
// then they work in SQLite too. This is because when $ is used, SQLite
// binds first parameter in array to first $whatever in the statement,
// second parameter to second $something etc.
_run(sql, values, cb) {
switch (this._options.db_type) {
case 'sqlite':
this._db.run(sql, ...values, cb);
break;
case 'pg':
this._db.query(sql, values, iferr(cb, () => cb()));
break;
}
}
_all(sql, values, cb) {
switch (this._options.db_type) {
case 'sqlite':
this._db.all(sql, ...values, cb);
break;
case 'pg':
this._db.query(sql, values, iferr(cb, r => cb(null, r.rows)));
break;
}
}
_get(sql, values, cb) {
switch (this._options.db_type) {
case 'sqlite':
this._db.get(sql, ...values, cb);
break;
case 'pg':
this._db.query(sql, values, iferr(cb, r => cb(null, r.rows[0])));
break;
}
}
}
module.exports = function (config, cb) {
new PubKeyStoreSQL(config, cb);
};
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