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const Model = require('objection').Model
const path = require('path')
const fs = require('fs-extra')
const _ = require('lodash')
const yaml = require('js-yaml')
const DepGraph = require('dependency-graph').DepGraph
const commonHelper = require('../helpers/common')
/* global WIKI */
/**
* Renderer model
*/
module.exports = class Renderer extends Model {
static get tableName() { return 'renderers' }
static get idColumn() { return 'key' }
static get jsonSchema () {
return {
type: 'object',
required: ['key', 'isEnabled'],
properties: {
key: {type: 'string'},
isEnabled: {type: 'boolean'}
}
}
}
static get jsonAttributes() {
return ['config']
}
static async getRenderers() {
return WIKI.models.renderers.query()
}
static async fetchDefinitions() {
const rendererDirs = await fs.readdir(path.join(WIKI.SERVERPATH, 'modules/rendering'))
let diskRenderers = []
for (let dir of rendererDirs) {
const def = await fs.readFile(path.join(WIKI.SERVERPATH, 'modules/rendering', dir, 'definition.yml'), 'utf8')
diskRenderers.push(yaml.safeLoad(def))
}
WIKI.data.renderers = diskRenderers.map(renderer => ({
...renderer,
props: commonHelper.parseModuleProps(renderer.props)
}))
}
static async refreshRenderersFromDisk() {
let trx
try {
const dbRenderers = await WIKI.models.renderers.query()
// -> Fetch definitions from disk
await WIKI.models.renderers.fetchDefinitions()
// -> Insert new Renderers
let newRenderers = []
for (let renderer of WIKI.data.renderers) {
if (!_.some(dbRenderers, ['key', renderer.key])) {
newRenderers.push({
key: renderer.key,
isEnabled: _.get(renderer, 'enabledDefault', true),
config: _.transform(renderer.props, (result, value, key) => {
_.set(result, key, value.default)
return result
}, {})
})
} else {
const rendererConfig = _.get(_.find(dbRenderers, ['key', renderer.key]), 'config', {})
await WIKI.models.renderers.query().patch({
config: _.transform(renderer.props, (result, value, key) => {
if (!_.has(result, key)) {
_.set(result, key, value.default)
}
return result
}, rendererConfig)
}).where('key', renderer.key)
}
}
if (newRenderers.length > 0) {
trx = await WIKI.models.Objection.transaction.start(WIKI.models.knex)
for (let renderer of newRenderers) {
await WIKI.models.renderers.query(trx).insert(renderer)
}
await trx.commit()
WIKI.logger.info(`Loaded ${newRenderers.length} new renderers: [ OK ]`)
} else {
WIKI.logger.info(`No new renderers found: [ SKIPPED ]`)
}
} catch (err) {
WIKI.logger.error(`Failed to scan or load new renderers: [ FAILED ]`)
WIKI.logger.error(err)
if (trx) {
trx.rollback()
}
}
}
static async getRenderingPipeline(contentType) {
const renderersDb = await WIKI.models.renderers.query().where('isEnabled', true)
if (renderersDb && renderersDb.length > 0) {
const renderers = renderersDb.map(rdr => {
const renderer = _.find(WIKI.data.renderers, ['key', rdr.key])
return {
...renderer,
config: rdr.config
}
})
// Build tree
const rawCores = _.filter(renderers, renderer => !_.has(renderer, 'dependsOn')).map(core => {
core.children = _.filter(renderers, ['dependsOn', core.key])
return core
})
// Build dependency graph
const graph = new DepGraph({ circular: true })
rawCores.map(core => { graph.addNode(core.key) })
rawCores.map(core => {
rawCores.map(coreTarget => {
if (core.key !== coreTarget.key) {
if (core.output === coreTarget.input) {
graph.addDependency(core.key, coreTarget.key)
}
}
})
})
// Filter unused cores
let activeCoreKeys = _.filter(rawCores, ['input', contentType]).map(core => core.key)
_.clone(activeCoreKeys).map(coreKey => {
activeCoreKeys = _.union(activeCoreKeys, graph.dependenciesOf(coreKey))
})
const activeCores = _.filter(rawCores, core => _.includes(activeCoreKeys, core.key))
// Rebuild dependency graph with active cores
const graphActive = new DepGraph({ circular: true })
activeCores.map(core => { graphActive.addNode(core.key) })
activeCores.map(core => {
activeCores.map(coreTarget => {
if (core.key !== coreTarget.key) {
if (core.output === coreTarget.input) {
graphActive.addDependency(core.key, coreTarget.key)
}
}
})
})
// Reorder cores in reverse dependency order
let orderedCores = []
_.reverse(graphActive.overallOrder()).map(coreKey => {
orderedCores.push(_.find(rawCores, ['key', coreKey]))
})
return orderedCores
} else {
WIKI.logger.error(`Rendering pipeline is empty!`)
return false
}
}
}