overleaf/services/document-updater/app/js/ShareJsDB.js

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/* eslint-disable
camelcase,
no-unused-vars,
*/
// TODO: This file was created by bulk-decaffeinate.
// Fix any style issues and re-enable lint.
/*
* decaffeinate suggestions:
* DS101: Remove unnecessary use of Array.from
* DS102: Remove unnecessary code created because of implicit returns
* DS207: Consider shorter variations of null checks
* Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
*/
let ShareJsDB
const Keys = require('./UpdateKeys')
const RedisManager = require('./RedisManager')
const Errors = require('./Errors')
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module.exports = ShareJsDB = class ShareJsDB {
constructor(project_id, doc_id, lines, version) {
this.project_id = project_id
this.doc_id = doc_id
this.lines = lines
this.version = version
this.appliedOps = {}
// ShareJS calls this detacted from the instance, so we need
// bind it to keep our context that can access @appliedOps
this.writeOp = this._writeOp.bind(this)
}
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getOps(doc_key, start, end, callback) {
if (start === end) {
return callback(null, [])
}
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// In redis, lrange values are inclusive.
if (end != null) {
end--
} else {
end = -1
}
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const [project_id, doc_id] = Array.from(
Keys.splitProjectIdAndDocId(doc_key)
)
return RedisManager.getPreviousDocOps(doc_id, start, end, callback)
}
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_writeOp(doc_key, opData, callback) {
if (this.appliedOps[doc_key] == null) {
this.appliedOps[doc_key] = []
}
this.appliedOps[doc_key].push(opData)
return callback()
}
getSnapshot(doc_key, callback) {
if (
doc_key !== Keys.combineProjectIdAndDocId(this.project_id, this.doc_id)
) {
return callback(
new Errors.NotFoundError(
`unexpected doc_key ${doc_key}, expected ${Keys.combineProjectIdAndDocId(
this.project_id,
this.doc_id
)}`
)
)
} else {
return callback(null, {
snapshot: this.lines.join('\n'),
v: parseInt(this.version, 10),
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type: 'text',
})
}
}
// To be able to remove a doc from the ShareJS memory
// we need to called Model::delete, which calls this
// method on the database. However, we will handle removing
// it from Redis ourselves
delete(docName, dbMeta, callback) {
return callback()
}
}