1 | import prefetchHelper from "./prefetch"
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2 | import emitter from "./emitter"
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3 | import { setMatchPaths, findPath, findMatchPath } from "./find-path"
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4 |
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5 | const preferDefault = m => (m && m.default) || m
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6 |
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7 | const stripSurroundingSlashes = s => {
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8 | s = s[0] === `/` ? s.slice(1) : s
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9 | s = s.endsWith(`/`) ? s.slice(0, -1) : s
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10 | return s
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11 | }
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12 |
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13 | const createPageDataUrl = path => {
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14 | const fixedPath = path === `/` ? `index` : stripSurroundingSlashes(path)
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15 | return `${__PATH_PREFIX__}/page-data/${fixedPath}/page-data.json`
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16 | }
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17 |
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18 | const doFetch = (url, method = `GET`) =>
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19 | new Promise((resolve, reject) => {
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20 | const req = new XMLHttpRequest()
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21 | req.open(method, url, true)
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22 | req.onreadystatechange = () => {
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23 | if (req.readyState == 4) {
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24 | resolve(req)
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25 | }
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26 | }
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27 | req.send(null)
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28 | })
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29 |
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30 | const loadPageDataJson = loadObj => {
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31 | const { pagePath, retries = 0 } = loadObj
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32 | const url = createPageDataUrl(pagePath)
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33 | return doFetch(url).then(req => {
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34 | const { status, responseText } = req
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35 |
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36 |
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37 | if (status === 200) {
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38 | try {
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39 | const jsonPayload = JSON.parse(responseText)
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40 | if (jsonPayload.path === undefined) {
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41 | throw new Error(`not a valid pageData response`)
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42 | }
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43 |
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44 | return Object.assign(loadObj, {
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45 | status: `success`,
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46 | payload: jsonPayload,
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47 | })
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48 | } catch (err) {
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49 |
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50 | }
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51 | }
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52 |
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53 |
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54 | if (status === 404 || status === 200) {
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55 |
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56 | if (pagePath === `/404.html`) {
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57 | return Object.assign(loadObj, {
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58 | status: `failure`,
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59 | })
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60 | }
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61 |
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62 |
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63 |
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64 | return loadPageDataJson(
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65 | Object.assign(loadObj, { pagePath: `/404.html`, notFound: true })
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66 | )
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67 | }
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68 |
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69 |
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70 | if (status === 500) {
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71 | return Object.assign(loadObj, {
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72 | status: `error`,
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73 | })
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74 | }
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75 |
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76 |
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77 | if (retries < 3) {
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78 | return loadPageDataJson(Object.assign(loadObj, { retries: retries + 1 }))
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79 | }
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80 |
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81 |
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82 | return Object.assign(loadObj, {
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83 | status: `error`,
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84 | })
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85 | })
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86 | }
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87 |
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88 | const doesConnectionSupportPrefetch = () => {
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89 | if (
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90 | `connection` in navigator &&
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91 | typeof navigator.connection !== `undefined`
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92 | ) {
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93 | if ((navigator.connection.effectiveType || ``).includes(`2g`)) {
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94 | return false
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95 | }
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96 | if (navigator.connection.saveData) {
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97 | return false
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98 | }
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99 | }
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100 | return true
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101 | }
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102 |
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103 | const toPageResources = (pageData, component = null) => {
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104 | const page = {
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105 | componentChunkName: pageData.componentChunkName,
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106 | path: pageData.path,
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107 | webpackCompilationHash: pageData.webpackCompilationHash,
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108 | matchPath: pageData.matchPath,
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109 | }
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110 |
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111 | return {
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112 | component,
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113 | json: pageData.result,
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114 | page,
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115 | }
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116 | }
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117 |
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118 | export class BaseLoader {
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119 | constructor(loadComponent, matchPaths) {
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120 |
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121 |
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122 |
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123 |
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124 |
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125 |
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126 |
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127 |
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128 |
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129 |
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130 |
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131 |
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132 |
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133 | this.pageDb = new Map()
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134 | this.inFlightDb = new Map()
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135 | this.pageDataDb = new Map()
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136 | this.prefetchTriggered = new Set()
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137 | this.prefetchCompleted = new Set()
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138 | this.loadComponent = loadComponent
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139 | setMatchPaths(matchPaths)
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140 | }
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141 |
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142 | setApiRunner(apiRunner) {
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143 | this.apiRunner = apiRunner
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144 | this.prefetchDisabled = apiRunner(`disableCorePrefetching`).some(a => a)
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145 | }
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146 |
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147 | loadPageDataJson(rawPath) {
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148 | const pagePath = findPath(rawPath)
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149 | if (this.pageDataDb.has(pagePath)) {
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150 | return Promise.resolve(this.pageDataDb.get(pagePath))
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151 | }
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152 |
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153 | return loadPageDataJson({ pagePath }).then(pageData => {
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154 | this.pageDataDb.set(pagePath, pageData)
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155 |
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156 | return pageData
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157 | })
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158 | }
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159 |
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160 | findMatchPath(rawPath) {
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161 | return findMatchPath(rawPath)
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162 | }
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163 |
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164 |
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165 | loadPage(rawPath) {
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166 | const pagePath = findPath(rawPath)
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167 | if (this.pageDb.has(pagePath)) {
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168 | const page = this.pageDb.get(pagePath)
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169 | return Promise.resolve(page.payload)
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170 | }
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171 | if (this.inFlightDb.has(pagePath)) {
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172 | return this.inFlightDb.get(pagePath)
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173 | }
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174 |
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175 | const inFlight = Promise.all([
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176 | this.loadAppData(),
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177 | this.loadPageDataJson(pagePath),
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178 | ])
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179 | .then(allData => {
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180 | const result = allData[1]
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181 | if (result.status === `error`) {
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182 | return {
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183 | status: `error`,
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184 | }
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185 | }
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186 | if (result.status === `failure`) {
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187 |
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188 | throw new Error(
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189 | `404 page could not be found. Checkout https://www.gatsbyjs.org/docs/add-404-page/`
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190 | )
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191 | }
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192 |
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193 | let pageData = result.payload
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194 | const { componentChunkName } = pageData
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195 | return this.loadComponent(componentChunkName).then(component => {
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196 | const finalResult = { createdAt: new Date() }
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197 | let pageResources
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198 | if (!component) {
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199 | finalResult.status = `error`
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200 | } else {
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201 | finalResult.status = `success`
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202 | if (result.notFound === true) {
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203 | finalResult.notFound = true
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204 | }
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205 | pageData = Object.assign(pageData, {
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206 | webpackCompilationHash: allData[0]
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207 | ? allData[0].webpackCompilationHash
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208 | : ``,
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209 | })
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210 | pageResources = toPageResources(pageData, component)
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211 | finalResult.payload = pageResources
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212 | emitter.emit(`onPostLoadPageResources`, {
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213 | page: pageResources,
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214 | pageResources,
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215 | })
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216 | }
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217 | this.pageDb.set(pagePath, finalResult)
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218 |
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219 | return pageResources
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220 | })
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221 | })
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222 |
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223 | .then(response => {
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224 | this.inFlightDb.delete(pagePath)
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225 | return response
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226 | })
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227 | .catch(err => {
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228 | this.inFlightDb.delete(pagePath)
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229 | throw err
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230 | })
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231 |
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232 | this.inFlightDb.set(pagePath, inFlight)
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233 | return inFlight
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234 | }
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235 |
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236 |
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237 | loadPageSync(rawPath) {
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238 | const pagePath = findPath(rawPath)
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239 | if (this.pageDb.has(pagePath)) {
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240 | return this.pageDb.get(pagePath).payload
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241 | }
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242 | return undefined
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243 | }
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244 |
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245 | shouldPrefetch(pagePath) {
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246 |
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247 | if (!doesConnectionSupportPrefetch()) {
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248 | return false
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249 | }
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250 |
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251 |
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252 | if (this.pageDb.has(pagePath)) {
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253 | return false
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254 | }
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255 |
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256 | return true
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257 | }
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258 |
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259 | prefetch(pagePath) {
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260 | if (!this.shouldPrefetch(pagePath)) {
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261 | return false
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262 | }
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263 |
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264 |
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265 |
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266 | if (!this.prefetchTriggered.has(pagePath)) {
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267 | this.apiRunner(`onPrefetchPathname`, { pathname: pagePath })
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268 | this.prefetchTriggered.add(pagePath)
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269 | }
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270 |
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271 |
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272 | if (this.prefetchDisabled) {
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273 | return false
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274 | }
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275 |
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276 | const realPath = findPath(pagePath)
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277 |
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278 |
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279 | this.doPrefetch(realPath).then(() => {
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280 | if (!this.prefetchCompleted.has(pagePath)) {
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281 | this.apiRunner(`onPostPrefetchPathname`, { pathname: pagePath })
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282 | this.prefetchCompleted.add(pagePath)
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283 | }
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284 | })
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285 |
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286 | return true
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287 | }
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288 |
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289 | doPrefetch(pagePath) {
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290 | throw new Error(`doPrefetch not implemented`)
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291 | }
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292 |
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293 | hovering(rawPath) {
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294 | this.loadPage(rawPath)
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295 | }
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296 |
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297 | getResourceURLsForPathname(rawPath) {
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298 | const pagePath = findPath(rawPath)
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299 | const page = this.pageDataDb.get(pagePath)
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300 | if (page) {
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301 | const pageResources = toPageResources(page.payload)
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302 |
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303 | return [
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304 | ...createComponentUrls(pageResources.page.componentChunkName),
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305 | createPageDataUrl(pagePath),
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306 | ]
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307 | } else {
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308 | return null
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309 | }
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310 | }
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311 |
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312 | isPageNotFound(rawPath) {
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313 | const pagePath = findPath(rawPath)
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314 | const page = this.pageDb.get(pagePath)
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315 | return page && page.notFound === true
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316 | }
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317 |
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318 | loadAppData(retries = 0) {
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319 | return doFetch(`${__PATH_PREFIX__}/page-data/app-data.json`).then(req => {
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320 | const { status, responseText } = req
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321 |
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322 | let appData
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323 |
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324 | if (status !== 200 && retries < 3) {
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325 |
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326 | return this.loadAppData(retries + 1)
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327 | }
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328 |
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329 |
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330 | if (status === 200) {
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331 | try {
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332 | const jsonPayload = JSON.parse(responseText)
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333 | if (jsonPayload.webpackCompilationHash === undefined) {
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334 | throw new Error(`not a valid app-data response`)
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335 | }
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336 |
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337 | appData = jsonPayload
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338 | } catch (err) {
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339 |
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340 | }
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341 | }
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342 |
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343 | return appData
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344 | })
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345 | }
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346 | }
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347 |
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348 | const createComponentUrls = componentChunkName =>
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349 | window.___chunkMapping[componentChunkName].map(
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350 | chunk => __PATH_PREFIX__ + chunk
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351 | )
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352 |
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353 | export class ProdLoader extends BaseLoader {
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354 | constructor(asyncRequires, matchPaths) {
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355 | const loadComponent = chunkName =>
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356 | asyncRequires.components[chunkName]().then(preferDefault)
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357 |
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358 | super(loadComponent, matchPaths)
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359 | }
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360 |
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361 | doPrefetch(pagePath) {
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362 | const pageDataUrl = createPageDataUrl(pagePath)
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363 | return prefetchHelper(pageDataUrl, {
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364 | crossOrigin: `anonymous`,
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365 | as: `fetch`,
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366 | })
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367 | .then(() =>
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368 |
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369 |
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370 | this.loadPageDataJson(pagePath)
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371 | )
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372 | .then(result => {
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373 | if (result.status !== `success`) {
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374 | return Promise.resolve()
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375 | }
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376 | const pageData = result.payload
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377 | const chunkName = pageData.componentChunkName
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378 | const componentUrls = createComponentUrls(chunkName)
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379 | return Promise.all(componentUrls.map(prefetchHelper)).then(
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380 | () => pageData
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381 | )
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382 | })
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383 | }
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384 | }
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385 |
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386 | let instance
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387 |
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388 | export const setLoader = _loader => {
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389 | instance = _loader
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390 | }
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391 |
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392 | export const publicLoader = {
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393 |
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394 |
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395 |
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396 | getResourcesForPathname: rawPath => {
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397 | console.warn(
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398 | `Warning: getResourcesForPathname is deprecated. Use loadPage instead`
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399 | )
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400 | return instance.i.loadPage(rawPath)
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401 | },
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402 | getResourcesForPathnameSync: rawPath => {
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403 | console.warn(
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404 | `Warning: getResourcesForPathnameSync is deprecated. Use loadPageSync instead`
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405 | )
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406 | return instance.i.loadPageSync(rawPath)
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407 | },
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408 | enqueue: rawPath => instance.prefetch(rawPath),
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409 |
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410 |
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411 | getResourceURLsForPathname: rawPath =>
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412 | instance.getResourceURLsForPathname(rawPath),
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413 | loadPage: rawPath => instance.loadPage(rawPath),
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414 | loadPageSync: rawPath => instance.loadPageSync(rawPath),
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415 | prefetch: rawPath => instance.prefetch(rawPath),
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416 | isPageNotFound: rawPath => instance.isPageNotFound(rawPath),
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417 | hovering: rawPath => instance.hovering(rawPath),
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418 | loadAppData: () => instance.loadAppData(),
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419 | }
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420 |
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421 | export default publicLoader
|