import Vue from 'vue'
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import { hasFetch, normalizeError, addLifecycleHook, createGetCounter } from '../utils'
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const isSsrHydration = (vm) => vm.$vnode && vm.$vnode.elm && vm.$vnode.elm.dataset && vm.$vnode.elm.dataset.fetchKey
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const nuxtState = window.__NUXT__
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export default {
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beforeCreate () {
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if (!hasFetch(this)) {
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return
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}
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this._fetchDelay = typeof this.$options.fetchDelay === 'number' ? this.$options.fetchDelay : 200
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Vue.util.defineReactive(this, '$fetchState', {
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pending: false,
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error: null,
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timestamp: Date.now()
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})
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this.$fetch = $fetch.bind(this)
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addLifecycleHook(this, 'created', created)
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addLifecycleHook(this, 'beforeMount', beforeMount)
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}
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}
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function beforeMount() {
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if (!this._hydrated) {
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return this.$fetch()
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}
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}
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function created() {
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if (!isSsrHydration(this)) {
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return
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}
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// Hydrate component
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this._hydrated = true
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this._fetchKey = this.$vnode.elm.dataset.fetchKey
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const data = nuxtState.fetch[this._fetchKey]
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// If fetch error
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if (data && data._error) {
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this.$fetchState.error = data._error
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return
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}
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// Merge data
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for (const key in data) {
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Vue.set(this.$data, key, data[key])
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}
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}
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function $fetch() {
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if (!this._fetchPromise) {
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this._fetchPromise = $_fetch.call(this)
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.then(() => { delete this._fetchPromise })
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}
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return this._fetchPromise
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}
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async function $_fetch() {
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this.$nuxt.nbFetching++
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this.$fetchState.pending = true
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this.$fetchState.error = null
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this._hydrated = false
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let error = null
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const startTime = Date.now()
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try {
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await this.$options.fetch.call(this)
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} catch (err) {
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if (process.dev) {
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console.error('Error in fetch():', err)
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}
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error = normalizeError(err)
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}
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const delayLeft = this._fetchDelay - (Date.now() - startTime)
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if (delayLeft > 0) {
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await new Promise(resolve => setTimeout(resolve, delayLeft))
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}
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this.$fetchState.error = error
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this.$fetchState.pending = false
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this.$fetchState.timestamp = Date.now()
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this.$nextTick(() => this.$nuxt.nbFetching--)
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}
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