import Vue from 'vue'
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import { hasFetch, normalizeError, addLifecycleHook, purifyData, createGetCounter } from '../utils'
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async function serverPrefetch() {
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if (!this._fetchOnServer) {
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return
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}
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// Call and await on $fetch
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try {
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await this.$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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this.$fetchState.error = normalizeError(err)
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}
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this.$fetchState.pending = false
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// Define an ssrKey for hydration
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this._fetchKey = this._fetchKey || this.$ssrContext.fetchCounters['']++
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// Add data-fetch-key on parent element of Component
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const attrs = this.$vnode.data.attrs = this.$vnode.data.attrs || {}
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attrs['data-fetch-key'] = this._fetchKey
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// Add to ssrContext for window.__NUXT__.fetch
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if (this.$ssrContext.nuxt.fetch[this._fetchKey] !== undefined) {
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console.warn(`Duplicate fetch key detected (${this._fetchKey}). This may lead to unexpected results.`)
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}
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this.$ssrContext.nuxt.fetch[this._fetchKey] =
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this.$fetchState.error ? { _error: this.$fetchState.error } : purifyData(this._data)
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}
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export default {
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created() {
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if (!hasFetch(this)) {
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return
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}
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if (typeof this.$options.fetchOnServer === 'function') {
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this._fetchOnServer = this.$options.fetchOnServer.call(this) !== false
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} else {
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this._fetchOnServer = this.$options.fetchOnServer !== false
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}
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const defaultKey = this.$options._scopeId || this.$options.name || ''
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const getCounter = createGetCounter(this.$ssrContext.fetchCounters, defaultKey)
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if (typeof this.$options.fetchKey === 'function') {
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this._fetchKey = this.$options.fetchKey.call(this, getCounter)
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} else {
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const key = 'string' === typeof this.$options.fetchKey ? this.$options.fetchKey : defaultKey
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this._fetchKey = key ? key + ':' + getCounter(key) : String(getCounter(key))
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}
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// Added for remove vue undefined warning while ssr
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this.$fetch = () => {} // issue #8043
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Vue.util.defineReactive(this, '$fetchState', {
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pending: true,
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error: null,
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timestamp: Date.now()
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})
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addLifecycleHook(this, 'serverPrefetch', serverPrefetch)
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}
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}
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