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import { values } from 'lodash'
import * as Sequelize from 'sequelize'
import { REQUEST_ENDPOINTS } from '../initializers'
import { addMethodsToModel } from './utils'
import {
RequestClass,
RequestInstance,
RequestAttributes,
RequestMethods
} from './request-interface'
let Request: Sequelize.Model<RequestInstance, RequestAttributes>
let countTotalRequests: RequestMethods.CountTotalRequests
let listWithLimitAndRandom: RequestMethods.ListWithLimitAndRandom
let removeWithEmptyTo: RequestMethods.RemoveWithEmptyTo
let removeAll: RequestMethods.RemoveAll
export default function (sequelize, DataTypes) {
Request = sequelize.define('Request',
{
request: {
type: DataTypes.JSON,
allowNull: false
},
endpoint: {
type: DataTypes.ENUM(values(REQUEST_ENDPOINTS)),
allowNull: false
}
}
)
const classMethods = [
associate,
listWithLimitAndRandom,
countTotalRequests,
removeAll,
removeWithEmptyTo
]
addMethodsToModel(Request, classMethods)
return Request
}
// ------------------------------ STATICS ------------------------------
function associate (models) {
Request.belongsToMany(models.Pod, {
foreignKey: {
name: 'requestId',
allowNull: false
},
through: models.RequestToPod,
onDelete: 'CASCADE'
})
}
countTotalRequests = function (callback) {
// We need to include Pod because there are no cascade delete when a pod is removed
// So we could count requests that do not have existing pod anymore
const query = {
include: [ Request['sequelize'].models.Pod ]
}
return Request.count(query).asCallback(callback)
}
listWithLimitAndRandom = function (limitPods, limitRequestsPerPod, callback) {
const Pod = Request['sequelize'].models.Pod
Pod.listRandomPodIdsWithRequest(limitPods, 'RequestToPods', function (err, podIds) {
if (err) return callback(err)
// We don't have friends that have requests
if (podIds.length === 0) return callback(null, [])
// The first x requests of these pods
// It is very important to sort by id ASC to keep the requests order!
const query = {
order: [
[ 'id', 'ASC' ]
],
include: [
{
model: Request['sequelize'].models.Pod,
where: {
id: {
$in: podIds
}
}
}
]
}
Request.findAll(query).asCallback(function (err, requests) {
if (err) return callback(err)
const requestsGrouped = groupAndTruncateRequests(requests, limitRequestsPerPod)
return callback(err, requestsGrouped)
})
})
}
removeAll = function (callback) {
// Delete all requests
Request.truncate({ cascade: true }).asCallback(callback)
}
removeWithEmptyTo = function (callback) {
if (!callback) callback = function () { /* empty */ }
const query = {
where: {
id: {
$notIn: [
Sequelize.literal('SELECT "requestId" FROM "RequestToPods"')
]
}
}
}
Request.destroy(query).asCallback(callback)
}
// ---------------------------------------------------------------------------
function groupAndTruncateRequests (requests, limitRequestsPerPod) {
const requestsGrouped = {}
requests.forEach(function (request) {
request.Pods.forEach(function (pod) {
if (!requestsGrouped[pod.id]) requestsGrouped[pod.id] = []
if (requestsGrouped[pod.id].length < limitRequestsPerPod) {
requestsGrouped[pod.id].push({
request,
pod
})
}
})
})
return requestsGrouped
}
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