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import { isEmpty } from 'lodash'
import * as Bluebird from 'bluebird'
import { database as db } from '../../initializers/database'
import { logger, makeSecureRequest } from '../../helpers'
import { AbstractRequestClass, AbstractRequestToPodClass, PodInstance } from '../../models'
import {
API_VERSION,
REQUESTS_IN_PARALLEL,
REQUESTS_INTERVAL
} from '../../initializers'
interface RequestsObjects<U> {
[ id: string ]: {
toPod: PodInstance
endpoint: string
ids: number[] // ids
datas: U[]
}
}
abstract class AbstractRequestScheduler <T> {
requestInterval: number
limitPods: number
limitPerPod: number
protected lastRequestTimestamp: number
protected timer: NodeJS.Timer
protected description: string
constructor () {
this.lastRequestTimestamp = 0
this.timer = null
this.requestInterval = REQUESTS_INTERVAL
}
abstract getRequestModel (): AbstractRequestClass<T>
abstract getRequestToPodModel (): AbstractRequestToPodClass
abstract buildRequestsObjects (requestsGrouped: T): RequestsObjects<any>
activate () {
logger.info('Requests scheduler activated.')
this.lastRequestTimestamp = Date.now()
this.timer = setInterval(() => {
this.lastRequestTimestamp = Date.now()
this.makeRequests()
}, this.requestInterval)
}
deactivate () {
logger.info('Requests scheduler deactivated.')
clearInterval(this.timer)
this.timer = null
}
forceSend () {
logger.info('Force requests scheduler sending.')
this.makeRequests()
}
remainingMilliSeconds () {
if (this.timer === null) return -1
return REQUESTS_INTERVAL - (Date.now() - this.lastRequestTimestamp)
}
remainingRequestsCount () {
return this.getRequestModel().countTotalRequests()
}
flush () {
return this.getRequestModel().removeAll()
}
// ---------------------------------------------------------------------------
// Make a requests to friends of a certain type
protected async makeRequest (toPod: PodInstance, requestEndpoint: string, requestsToMake: any) {
const params = {
toPod: toPod,
method: 'POST' as 'POST',
path: '/api/' + API_VERSION + '/remote/' + requestEndpoint,
data: requestsToMake // Requests we need to make
}
// Make multiple retry requests to all of pods
// The function fire some useful callbacks
try {
const { response } = await makeSecureRequest(params)
if (response.statusCode !== 200 && response.statusCode !== 201 && response.statusCode !== 204) {
throw new Error('Status code not 20x : ' + response.statusCode)
}
} catch (err) {
logger.error('Error sending secure request to %s pod.', toPod.host, err)
throw err
}
}
// Make all the requests of the scheduler
protected async makeRequests () {
let requestsGrouped: T
try {
requestsGrouped = await this.getRequestModel().listWithLimitAndRandom(this.limitPods, this.limitPerPod)
} catch (err) {
logger.error('Cannot get the list of "%s".', this.description, { error: err.stack })
throw err
}
// We want to group requests by destinations pod and endpoint
const requestsToMake = this.buildRequestsObjects(requestsGrouped)
// If there are no requests, abort
if (isEmpty(requestsToMake) === true) {
logger.info('No "%s" to make.', this.description)
return { goodPods: [], badPods: [] }
}
logger.info('Making "%s" to friends.', this.description)
const goodPods: number[] = []
const badPods: number[] = []
await Bluebird.map(Object.keys(requestsToMake), async hashKey => {
const requestToMake = requestsToMake[hashKey]
const toPod: PodInstance = requestToMake.toPod
try {
await this.makeRequest(toPod, requestToMake.endpoint, requestToMake.datas)
logger.debug('Removing requests for pod %s.', requestToMake.toPod.id, { requestsIds: requestToMake.ids })
goodPods.push(requestToMake.toPod.id)
this.afterRequestHook()
// Remove the pod id of these request ids
await this.getRequestToPodModel()
.removeByRequestIdsAndPod(requestToMake.ids, requestToMake.toPod.id)
} catch (err) {
badPods.push(requestToMake.toPod.id)
logger.info('Cannot make request to %s.', toPod.host, err)
}
}, { concurrency: REQUESTS_IN_PARALLEL })
this.afterRequestsHook()
// All the requests were made, we update the pods score
await db.Pod.updatePodsScore(goodPods, badPods)
}
protected afterRequestHook () {
// Nothing to do, let children re-implement it
}
protected afterRequestsHook () {
// Nothing to do, let children re-implement it
}
}
// ---------------------------------------------------------------------------
export {
AbstractRequestScheduler,
RequestsObjects
}
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