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model.js
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model.js
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'use strict';
const AmpersandModel = require('ampersand-model');
const AmpersandCollection = require('ampersand-collection');
const {
Collection: MongoDbCollectionCollection,
} = require('mongodb-collection-model');
function mergeInit(...init) {
return {
initialize(...args) {
init.forEach(({ initialize }) => {
initialize.call(this, ...args);
});
},
};
}
const Inflight = new Map();
function debounceInflight(fn) {
return function (...args) {
const callId = this.isCollection
? `${this.parent.cid}$$coll$$${fn.name}`
: `${this.cid}$$${fn.name}`;
if (Inflight.has(callId)) {
return Inflight.get(callId);
}
const promise = fn.call(this, ...args).finally(() => {
Inflight.delete(callId);
});
Inflight.set(callId, promise);
return promise;
};
}
function debounceActions(actions) {
return {
initialize() {
actions.forEach((key) => {
if (key in this && typeof this[key] === 'function') {
const origFn = this[key];
this[key] = debounceInflight(origFn);
}
});
},
};
}
function getParent(model) {
return model.parent ?? model.collection ?? null;
}
function propagate(evtName, ...args) {
let parent = getParent(this);
while (parent) {
parent.emit(evtName, ...args);
parent = getParent(parent);
}
}
function propagateCollectionEvents(namespace) {
return {
initialize() {
if (this.isCollection) {
this.on('add', propagate.bind(this, `add:${namespace}`));
this.on('remove', propagate.bind(this, `remove:${namespace}`));
this.on('change', propagate.bind(this, `change:${namespace}`));
for (const key of Object.keys(this.model.prototype._definition)) {
this.on(
`change:${key}`,
propagate.bind(this, `change:${namespace}.${key}`)
);
}
}
},
};
}
function getParentByType(model, type) {
const parent = getParent(model);
return parent
? parent.modelType === type
? parent
: getParentByType(parent, type)
: null;
}
/**
* Returns true if model is not ready (was fetched before and is not updating at
* the moment) or force fetch is requested
*/
function shouldFetch(status, force) {
return force || status !== 'ready';
}
const DatabaseModel = AmpersandModel.extend(
debounceActions(['fetch', 'fetchCollections']),
{
modelType: 'Database',
idAttribute: '_id',
props: {
_id: 'string',
name: 'string',
status: { type: 'string', default: 'initial' },
statusError: { type: 'string', default: null },
collectionsStatus: { type: 'string', default: 'initial' },
collectionsStatusError: { type: 'string', default: null },
collection_count: 'number',
document_count: 'number',
storage_size: 'number',
data_size: 'number',
index_count: 'number',
index_size: 'number',
},
derived: {
// Either returns a collection count from database stats or from real
// collections length. We want to fallback to collection_count from stats
// if possible if we haven't fetched collections yet, but use the real
// number if real collections info is available
collectionsLength: {
deps: ['collection_count', 'collectionsStatus', 'collections'],
fn() {
return ['ready', 'refreshing'].includes(this.collectionsStatus)
? this.collections.length
: this.collection_count ?? 0;
},
},
},
collections: {
collections: MongoDbCollectionCollection,
},
/**
* @param {{ dataService: import('mongodb-data-service').DataService }} dataService
* @returns {Promise<void>}
*/
async fetch({ dataService, force = false }) {
if (!shouldFetch(this.status, force)) {
return;
}
try {
const newStatus = this.status === 'initial' ? 'fetching' : 'refreshing';
this.set({ status: newStatus });
const stats = await dataService.databaseStats(this.getId());
this.set({ status: 'ready', statusError: null, ...stats });
} catch (err) {
this.set({ status: 'error', statusError: err.message });
throw err;
}
},
/**
* @param {{ dataService: import('mongodb-data-service').DataService }} dataService
* @returns {Promise<void>}
*/
async fetchCollections({ dataService, force = false }) {
if (!shouldFetch(this.collectionsStatus, force)) {
return;
}
try {
const newStatus =
this.collectionsStatus === 'initial' ? 'fetching' : 'refreshing';
this.set({ collectionsStatus: newStatus });
await this.collections.fetch({ dataService, force });
this.set({ collectionsStatus: 'ready', collectionsStatusError: null });
} catch (err) {
this.set({
collectionsStatus: 'error',
collectionsStatusError: err.message,
});
throw err;
}
},
async fetchCollectionsDetails({
dataService,
nameOnly = false,
force = false,
}) {
await this.fetchCollections({
dataService,
force,
});
if (nameOnly) {
return;
}
// We don't care if this fails, it just means less stats in the UI, hence
// the allSettled call here
await Promise.allSettled(
this.collections.map((coll) => {
return coll.fetch({
dataService,
// We already fetched it with fetchCollections
fetchInfo: false,
force
});
})
);
},
toJSON(opts = { derived: true }) {
return this.serialize(opts);
},
}
);
const DatabaseCollection = AmpersandCollection.extend(
mergeInit(debounceActions(['fetch']), propagateCollectionEvents('databases')),
{
modelType: 'DatabaseCollection',
mainIndex: '_id',
indexes: ['name'],
comparator: '_id',
model: DatabaseModel,
/**
* @param {{ dataService: import('mongodb-data-service').DataService }} dataService
* @returns {Promise<void>}
*/
async fetch({ dataService }) {
const instanceModel = getParentByType(this, 'Instance');
if (!instanceModel) {
throw new Error(
`Trying to fetch ${this.modelType} that doesn't have the Instance parent model`
);
}
const dbs = await dataService.listDatabases({
nameOnly: true,
privileges: instanceModel.auth.privileges,
roles: instanceModel.auth.roles
});
this.set(dbs.map(({ _id, name }) => ({ _id, name })));
},
toJSON(opts = { derived: true }) {
return this.map((item) => item.toJSON(opts));
},
}
);
DatabaseCollection.prototype[Symbol.iterator] = function* () {
for (let i = 0, len = this.length; i < len; i++) {
yield this.at(i);
}
};
module.exports = DatabaseModel;
module.exports.Collection = DatabaseCollection;