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import { map } from 'lodash'
import * as Sequelize from 'sequelize'
import { FRIEND_SCORE, PODS_SCORE } from '../../initializers'
import { logger, isHostValid } from '../../helpers'
import { addMethodsToModel, getSort } from '../utils'
import {
PodInstance,
PodAttributes,
PodMethods
} from './pod-interface'
let Pod: Sequelize.Model<PodInstance, PodAttributes>
let toFormattedJSON: PodMethods.ToFormattedJSON
let countAll: PodMethods.CountAll
let incrementScores: PodMethods.IncrementScores
let list: PodMethods.List
let listForApi: PodMethods.ListForApi
let listAllIds: PodMethods.ListAllIds
let listRandomPodIdsWithRequest: PodMethods.ListRandomPodIdsWithRequest
let listBadPods: PodMethods.ListBadPods
let load: PodMethods.Load
let loadByHost: PodMethods.LoadByHost
let removeAll: PodMethods.RemoveAll
let updatePodsScore: PodMethods.UpdatePodsScore
export default function (sequelize: Sequelize.Sequelize, DataTypes: Sequelize.DataTypes) {
Pod = sequelize.define<PodInstance, PodAttributes>('Pod',
{
host: {
type: DataTypes.STRING,
allowNull: false,
validate: {
isHost: value => {
const res = isHostValid(value)
if (res === false) throw new Error('Host not valid.')
}
}
},
score: {
type: DataTypes.INTEGER,
defaultValue: FRIEND_SCORE.BASE,
allowNull: false,
validate: {
isInt: true,
max: FRIEND_SCORE.MAX
}
}
},
{
indexes: [
{
fields: [ 'host' ],
unique: true
},
{
fields: [ 'score' ]
}
]
}
)
const classMethods = [
countAll,
incrementScores,
list,
listForApi,
listAllIds,
listRandomPodIdsWithRequest,
listBadPods,
load,
loadByHost,
updatePodsScore,
removeAll
]
const instanceMethods = [ toFormattedJSON ]
addMethodsToModel(Pod, classMethods, instanceMethods)
return Pod
}
// ------------------------------ METHODS ------------------------------
toFormattedJSON = function (this: PodInstance) {
const json = {
id: this.id,
host: this.host,
score: this.score as number,
createdAt: this.createdAt
}
return json
}
// ------------------------------ Statics ------------------------------
countAll = function () {
return Pod.count()
}
incrementScores = function (ids: number[], value: number) {
const update = {
score: Sequelize.literal('score +' + value)
}
const options = {
where: {
id: {
[Sequelize.Op.in]: ids
}
},
// In this case score is a literal and not an integer so we do not validate it
validate: false
}
return Pod.update(update, options)
}
list = function () {
return Pod.findAll()
}
listForApi = function (start: number, count: number, sort: string) {
const query = {
offset: start,
limit: count,
order: [ getSort(sort) ]
}
return Pod.findAndCountAll(query).then(({ rows, count }) => {
return {
data: rows,
total: count
}
})
}
listAllIds = function (transaction: Sequelize.Transaction) {
const query = {
attributes: [ 'id' ],
transaction
}
return Pod.findAll(query).then(pods => {
return map(pods, 'id')
})
}
listRandomPodIdsWithRequest = function (limit: number, tableWithPods: string, tableWithPodsJoins: string) {
return Pod.count().then(count => {
// Optimization...
if (count === 0) return []
let start = Math.floor(Math.random() * count) - limit
if (start < 0) start = 0
const subQuery = `(SELECT DISTINCT "${tableWithPods}"."podId" FROM "${tableWithPods}" ${tableWithPodsJoins})`
const query = {
attributes: [ 'id' ],
order: [
[ 'id', 'ASC' ]
],
offset: start,
limit: limit,
where: {
id: {
[Sequelize.Op.in]: Sequelize.literal(subQuery)
}
}
}
return Pod.findAll(query).then(pods => {
return map(pods, 'id')
})
})
}
listBadPods = function () {
const query = {
where: {
score: {
[Sequelize.Op.lte]: 0
}
}
}
return Pod.findAll(query)
}
load = function (id: number) {
return Pod.findById(id)
}
loadByHost = function (host: string) {
const query = {
where: {
host: host
}
}
return Pod.findOne(query)
}
removeAll = function () {
return Pod.destroy()
}
updatePodsScore = function (goodPods: number[], badPods: number[]) {
logger.info('Updating %d good pods and %d bad pods scores.', goodPods.length, badPods.length)
if (goodPods.length !== 0) {
incrementScores(goodPods, PODS_SCORE.BONUS).catch(err => {
logger.error('Cannot increment scores of good pods.', err)
})
}
if (badPods.length !== 0) {
incrementScores(badPods, PODS_SCORE.PENALTY)
.then(() => removeBadPods())
.catch(err => {
if (err) logger.error('Cannot decrement scores of bad pods.', err)
})
}
}
// ---------------------------------------------------------------------------
// Remove pods with a score of 0 (too many requests where they were unreachable)
async function removeBadPods () {
try {
const pods = await listBadPods()
const podsRemovePromises = pods.map(pod => pod.destroy())
await Promise.all(podsRemovePromises)
const numberOfPodsRemoved = pods.length
if (numberOfPodsRemoved) {
logger.info('Removed %d pods.', numberOfPodsRemoved)
} else {
logger.info('No need to remove bad pods.')
}
} catch (err) {
logger.error('Cannot remove bad pods.', err)
}
}
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