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learn.js
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learn.js
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// -*- mode: js; indent-tabs-mode: nil; js-basic-offset: 4 -*-
//
// This file is part of Almond
//
// Copyright 2019 The Board of Trustees of the Leland Stanford Junior University
//
// Author: Giovanni Campagna <gcampagn@cs.stanford.edu>
//
// See COPYING for details
"use strict";
const express = require('express');
const ThingTalk = require('thingtalk');
const Tp = require('thingpedia');
const router = express.Router();
const db = require('../util/db');
const iv = require('../util/input_validation');
const I18n = require('../util/i18n');
const userModel = require('../model/user');
const exampleModel = require('../model/example');
const Config = require('../config');
const LATEST_THINGTALK_VERSION = ThingTalk.version;
async function learn(req, res) {
let store = req.body.store;
if (['no', 'automatic', 'online', 'commandpedia'].indexOf(store) < 0) {
res.status(400).json({ error: 'Invalid store parameter' });
return;
}
const owner = req.body.owner;
if (store === 'commandpedia' && !owner) {
res.status(400).json({ error: 'Missing owner for commandpedia command' });
return;
}
if (!I18n.get(req.params.locale, false)) {
res.status(404).json({ error: 'Unsupported language' });
return;
}
const service = req.app.service;
const model = service.getModel(req.params.model_tag, req.params.locale);
if (!model) {
res.status(404).json({ error: 'No such model' });
return;
}
if (model.accessToken !== null && model.accessToken !== req.body.access_token) {
res.status(404).json({ error: 'No such model' });
return;
}
const languageTag = I18n.localeToLanguage(req.params.locale);
const utterance = req.body.q;
const tokenized = await service.tokenizer.tokenize(languageTag, utterance);
if (tokenized.tokens.length === 0) {
res.status(400).json({ error: 'Refusing to learn an empty sentence' });
return;
}
// if the client is out of date, don't even try to parse the code
// (as it might have changed meaning in the newer version of ThingTalk
// anyway)
if (req.body.thingtalk_version !== LATEST_THINGTALK_VERSION) {
res.status(200).json({ result: 'Ignored request from older ThingTalk' });
return;
}
let sequence = req.body.target.split(' ');
try {
const parsed = ThingTalk.NNSyntax.fromNN(sequence, tokenized.entities);
await parsed.typecheck(new ThingTalk.SchemaRetriever(model.tpClient, null, true));
// convert back to NN to normalize the program and also check that entities and spans
// are present
sequence = ThingTalk.NNSyntax.toNN(parsed, tokenized.tokens, tokenized.entities);
} catch(e) {
res.status(400).json({ error: 'Invalid ThingTalk', detail: e.message });
return;
}
const target_code = sequence.join(' ');
const preprocessed = tokenized.tokens.join(' ');
if (store === 'no') {
// do nothing, successfully
res.status(200).json({ result: 'Learnt successfully' });
return;
}
const trainable = store === 'online' || store === 'commandpedia';
if (store === 'online' && sequence[0] === 'bookkeeping')
store = 'online-bookkeeping';
const exampleId = await db.withTransaction(async (dbClient) => {
let ownerId;
if (!owner) {
ownerId = null;
} else if (owner.length === 8 || owner.length === 16 || owner.length === 64) {
try {
const result = await userModel.getIdByCloudId(dbClient, owner);
ownerId = result.id;
} catch(e) {
if (e.code === 'ENOENT') {
res.status(400).json({ error: 'Invalid command owner' });
return null;
} else {
throw e;
}
}
} else {
ownerId = parseInt(owner);
if (isNaN(ownerId)) {
res.status(400).json({ error: 'Invalid command owner' });
return null;
}
}
const exid = await exampleModel.create(dbClient, {
is_base: false,
language: languageTag,
utterance: utterance,
preprocessed: preprocessed,
type: store,
flags: (trainable ? 'training,exact' : ''),
target_code: target_code,
target_json: '',
owner: ownerId,
like_count: 0
});
if (store === 'commandpedia')
await exampleModel.like(dbClient, exid, ownerId);
return exid;
});
if (!exampleId)
return;
if (trainable) {
model.exact.add(preprocessed, target_code);
if (req.app.proxy) {
// call other replicas to reload the new example
const path = `/admin/reload/exact/@${req.params.model_tag}/${req.params.locale}?admin_token=${Config.NL_SERVER_ADMIN_TOKEN}`;
const promises = [];
for (const replica of await req.app.proxy.getEndpoints(Config.NL_SERVICE_NAME, true)) {
promises.push(Tp.Helpers.Http.post( `http://${replica}${path}`, `example_id=${encodeURIComponent(exampleId)}`, {
dataContentType: 'application/x-www-form-urlencoded',
extraHeaders: req.app.proxy.header()
}));
}
await Promise.all(promises);
}
}
res.status(200).json({ result: 'Learnt successfully', example_id: exampleId });
}
router.post('/@:model_tag/:locale/learn',
iv.validatePOST({ q: 'string', store: 'string', access_token: '?string', thingtalk_version: 'string', target: 'string', owner: '?string' }, { json: true }),
(req, res, next) => { learn(req, res).catch(next); });
router.post('/:locale/learn',
iv.validatePOST({ q: 'string', store: 'string', access_token: '?string', thingtalk_version: 'string', target: 'string', owner: '?string' }, { json: true }),
(req, res, next) => { learn(req, res).catch(next); });
module.exports = router;