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database.js
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database.js
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import _ from 'underscore';
import moment from 'moment';
import {getFilters, filterCardsByFilter} from './route-utils';
import IssueStore from './issue-store';
// 3 implementations: indexedDB, LocalStorage, In-mem
import Dexie from 'dexie';
import levelup from 'levelup';
import memdown from 'memdown';
import leveljs from 'level-js';
// import localstorage from 'localstorage-down';
// + querying the data
// import levelQuery from 'level-queryengine';
// import jsonqueryEngine from 'jsonquery-engine';
const DB_DATA = {
'issues': {
dbVersion: 1,
indexes: [
// { name: '[repoOwner+repoName]', keyPath: ['repoOwner', 'repoName'], unique: false, multiEntry: false },
{ name: 'state', keyPath: 'state', unique: false, multiEntry: false },
// // Do state as 2nd arg because it can be omitted.
// // See https://stackoverflow.com/questions/12084177/in-indexeddb-is-there-a-way-to-make-a-sorted-compound-query
// { name: '[kanbanColumn+state]', keyPath: ['kanbanColumn', 'state'], unique: false, multiEntry: false },
]
},
'repoLabels': { // contains repoOwner, repoName, labels
dbVersion: 1,
},
'repositories': {
dbVersion: 1,
// indexes: [
// { name: '[repoOwner+repoName]', keyPath: ['repoOwner', 'repoName'], unique: true, multiEntry: false }
// ]
},
// 'octokatCache': {
// dbVersion: 3,
// }
};
// MonkeyPatch memdown's batch function because it stringifies everything
memdown.prototype._batch = function (array, options, callback) {
let err
, i = -1
, key
, value
, iter
, len = array.length
, tree = this._store[this._location];
while (++i < len) {
if (!array[i])
continue;
key = this._isBuffer(array[i].key) ? array[i].key : String(array[i].key);
err = this._checkKey(key, 'key');
if (err)
return setImmediate(function errorCall() { callback(err); });
iter = tree.find(key);
if (array[i].type === 'put') {
// value = this._isBuffer(array[i].value) ? array[i].value : String(array[i].value)
value = array[i].value;
err = this._checkKey(value, 'value');
if (err)
return setImmediate(function errorCall() { callback(err); });
tree = iter.valid ? iter.update(value) : tree.insert(key, value);
} else {
tree = iter.remove();
}
}
this._store[this._location] = tree;
setImmediate(callback);
};
// Try to load/save to IndexedDB and fall back to localStorage for persisting the cache.
// localStorage support is needed because IndexedDB is disabled for Private browsing in Safari/Firefox
const database = new class Database {
constructor() {
this._dbs = {};
const dbNames = Object.keys(DB_DATA);
for (const i in dbNames) {
const key = dbNames[i];
this._dbs[key] = this._toDb(key);
}
this._opts = {asBuffer:false, raw:true, valueEncoding: 'none', fillCache:false};
}
_toDb(dbName) {
// See https://github.com/Level/levelup/wiki/Modules for more
let driver;
// driver = memdown;
driver = leveljs;
// driver = localstorage;
const {dbVersion, indexes} = DB_DATA[dbName];
const dbOpts = {db: driver, fillCache:false, asBuffer:false, raw:true, storePrefix:'', dbVersion:dbVersion, indexes:indexes, valueEncoding: 'none', };
let actualDb = levelup(dbName, dbOpts);
let memDb = levelup(dbName, {db:memdown, valueEncoding: 'none'}); // using memdb affects updateCard
// memDb = levelQuery(memDb);
// memDb.query.use(jsonqueryEngine());
const loadedPromise = new Promise((resolve, reject) => {
// TODO: somehow tell other code to wait until memDb is loaded
actualDb.createReadStream()
.on('data', ({key, value}) => {
memDb.put(key, value);
})
.on('error', (err) => {
reject(err);
})
.on('end', () => {
console.log('Done loading DB into memDb for ', dbName);
resolve(dbName);
});
});
return {memDb, actualDb, loadedPromise};
}
_toPromise(ctx, method, ...args) {
return new Promise((resolve, reject) => {
method.call(ctx, ...args, (err, val) => {
if (err) {
return reject(err);
}
return resolve(val);
});
});
}
// Ensures that the correct DB is open before performing an operation
_doOp(dbName, methodName, ...args) {
const {memDb, actualDb, loadedPromise} = this._dbs[dbName];
let db;
let method;
if (methodName === 'get') {
db = memDb;
method = memDb.get;
} else if (methodName === 'put') {
db = actualDb;
method = actualDb.put;
// put it into memDb now, instead of waiting for success
memDb.put(args[0], args[1], args[2]);
} else if (methodName === 'batch') {
db = actualDb;
method = actualDb.batch;
// put it into memDb now, instead of waiting for success
memDb.batch(args[0], args[1], args[2]);
} else {
throw new Error('Unknown levelDB operation. Expected get, put or batch but got ' + methodName);
}
return loadedPromise.then(() => {
return this._toPromise(db, method, ...args).then((val) => {
return val;
});
});
}
_resetDatabase(dbName) {
return Dexie.delete(dbName);
}
resetDatabases() {
return Promise.all(Object.keys(DB_DATA).map((dbName) => this._resetDatabase(dbName)));
}
getCard(repoOwner, repoName, number) {
return this._doOp('issues', 'get', `${repoOwner}/${repoName}#${number}`, this._opts);
}
// TODO: pass a filter as an arg so it can smartly (using Indexes) fetch the cards
// ie: If there is just 1 repo then use the repoName index.
// ie: If just getting open (or closed) Issues then use the `state` index.
fetchCards(filter) {
filter = filter || getFilters();
const {states} = filter.getState();
const db = new Dexie('issues');
db.version(DB_DATA['issues'].dbVersion / 10 /*Dexie multiplies everything by 10 bc IE*/).stores({'issues': 'id, state'});
return db.open().then(function() {
const cards = [];
let query;
if (states.length === 1) {
query = db.issues.where('state').equals('open');
} else if (states.length === 2 /* [open, closed] */) {
query = db.issues;
}
return query.each((value) => {
const {repoOwner, repoName, issue, pr, status} = value;
const number = issue.number;
cards.push(IssueStore.issueNumberToCard(repoOwner, repoName, number, issue, pr, status));
}).then(() => {
return filterCardsByFilter(cards, filter);
});
});
// // Alternative Method using leveDB (slow)
// const cards = [];
// return new Promise((resolve, reject) => {
// const start = Date.now();
// this._dbs['issues'].actualDb.createReadStream()
// .on('data', ({key, value}) => {
// const {repoOwner, repoName, issue} = value;
// const number = issue.number;
// cards.push(new Card(repoOwner, repoName, number, IssueStore.getGraph(), issue));
// })
// .on('end', () => {
// console.log((Date.now() - start) / 1000);
// resolve(cards);
// });
// });
}
patchCard(card) {
// this is atomic only because the get is instant because it's in-mem
const {repoOwner, repoName, number} = card;
return this.getCard(repoOwner, repoName, number).then((cardData) => {
_.extend({}, cardData, cardFields);
});
}
toCardValue(card) {
const {repoOwner, repoName, issue, _pr, _prStatus} = card;
const {columnRegExp} = getFilters().getState();
const labelNames = issue.labels.map((label) => label.name);
const value = {
repoOwner,
repoName,
issue, // TODO: Filter out useless info like URLs. No need to clutter up the db
// Computed fields used for Card rendering
labelNames,
kanbanColumn: labelNames.filter((labelName) => columnRegExp.test(labelName))[0],
state: issue.state,
userName: issue.assignee ? issue.assignee.login : issue.user.login,
milestoneName: issue.milestone ? issue.milestone.title : null,
updatedAtMs: moment(issue.updatedAt).toDate().getTime(),
};
if (_pr) value.pr = _pr; // TODO: Filter out useless info like URLs. No need to clutter up the db
if (_prStatus) value.status = _prStatus;
return value;
}
putCard(card) {
// return Promise.resolve();
const {repoOwner, repoName, number} = card;
const value = this.toCardValue(card);
// console.log(`database.putCard ${repoOwner}/${repoName}#${number}`);
return this._doOp('issues', 'put', `${repoOwner}/${repoName}#${number}`, value, this._opts);
}
putCards(cards) {
const batchOps = cards.map((card) => {
const {repoOwner, repoName, number} = card;
const value = this.toCardValue(card);
return {
type: 'put',
key: `${repoOwner}/${repoName}#${number}`,
value: value
};
});
return this._doOp('issues', 'batch', batchOps, this._opts);
}
// getLabel(labelName) {
// return this._doOp('labels', 'get', labelName, this._opts);
// }
// putLabel(repoOwner, repoName, label) {
// const {name, color} = label;
// return this._doOp('labels', 'put', name, {color, repoOwner, repoName}, this._opts);
// }
putRepoLabels(repoOwner, repoName, labels) {
return this._doOp('repoLabels', 'put', `${repoOwner}/${repoName}`, {repoOwner, repoName, labels});
}
getRepoLabels(repoOwner, repoName) {
return this._doOp('repoLabels', 'get', `${repoOwner}/${repoName}`);
}
getRepoLabelsOrNull(repoOwner, repoName) {
return new Promise((resolve) => {
this.getRepoLabels(repoOwner, repoName)
.then((val) => {
resolve(val);
})
.catch(() => { resolve(null); });
});
}
getRepo(repoOwner, repoName) {
return this._doOp('repositories', 'get', `${repoOwner}/${repoName}`, this._opts);
}
getRepoOrNull(repoOwner, repoName) {
return new Promise((resolve) => {
this.getRepo(repoOwner, repoName)
.then((val) => {
if (!val.repoName) {
console.error('BUG: Looks like we retrieved something that is not a repo. Maybe it was a string?', val);
throw new Error('BUG: Looks like we retrieved something that is not a repo. Maybe it was a string?');
}
resolve(val);
})
.catch(() => { resolve(null); });
});
}
putRepo(repoOwner, repoName, value) {
return this._doOp('repositories', 'put', `${repoOwner}/${repoName}`, value, this._opts);
}
putRepos(repos) {
const batchOps = repos.map((repo) => {
const {repoOwner, repoName} = repo;
return {
type: 'put',
key: `${repoOwner}/${repoName}`,
value: repo
};
});
return this._doOp('repositories', 'batch', batchOps, this._opts);
}
putCardsAndRepos(cards, repos) {
return this.putCards(cards).then(() => {
return this.putRepos(repos);
})
.catch((err) => {
console.error(err);
return err;
});
}
patchRepo(repoOwner, repoName, changes) {
const putRepo = (repoData) => {
return this.putRepo(repoOwner, repoName, _.extend({}, repoData || {}, {repoOwner, repoName}, changes));
};
return this.getRepo(repoOwner, repoName) // this is atomic only because the get is instant because it's in-mem
.then(putRepo)
.catch(() => putRepo()) // this error means the entry wasn't in the DB (which is OK for a PATCH)
.then(() => null);
}
};
window._database = database;
// Singleton
export default database;