/
on-demand-entry-handler.ts
363 lines (309 loc) · 10.1 KB
/
on-demand-entry-handler.ts
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
import { EventEmitter } from 'events'
import { join, posix } from 'path'
import type { webpack5 as webpack } from 'next/dist/compiled/webpack/webpack'
import { normalizePagePath, normalizePathSep } from '../normalize-page-path'
import { pageNotFoundError } from '../require'
import { findPageFile } from '../lib/find-page-file'
import getRouteFromEntrypoint from '../get-route-from-entrypoint'
import { API_ROUTE, MIDDLEWARE_ROUTE } from '../../lib/constants'
import { reportTrigger } from '../../build/output'
import type ws from 'ws'
import { NextConfigComplete } from '../config-shared'
import { isCustomErrorPage } from '../../build/utils'
export const ADDED = Symbol('added')
export const BUILDING = Symbol('building')
export const BUILT = Symbol('built')
export const entries: {
[page: string]: {
bundlePath: string
absolutePagePath: string
status?: typeof ADDED | typeof BUILDING | typeof BUILT
lastActiveTime?: number
dispose?: boolean
}
} = {}
export default function onDemandEntryHandler(
watcher: any,
multiCompiler: webpack.MultiCompiler,
{
pagesDir,
nextConfig,
maxInactiveAge,
pagesBufferLength,
}: {
pagesDir: string
nextConfig: NextConfigComplete
maxInactiveAge: number
pagesBufferLength: number
}
) {
const { compilers } = multiCompiler
const invalidator = new Invalidator(watcher, multiCompiler)
let lastClientAccessPages = ['']
let doneCallbacks: EventEmitter | null = new EventEmitter()
for (const compiler of compilers) {
compiler.hooks.make.tap(
'NextJsOnDemandEntries',
(_compilation: webpack.Compilation) => {
invalidator.startBuilding()
}
)
}
function getPagePathsFromEntrypoints(
type: string,
entrypoints: any
): string[] {
const pagePaths = []
for (const entrypoint of entrypoints.values()) {
const page = getRouteFromEntrypoint(entrypoint.name)
if (page) {
pagePaths.push(`${type}${page}`)
}
}
return pagePaths
}
multiCompiler.hooks.done.tap('NextJsOnDemandEntries', (multiStats) => {
if (invalidator.rebuildAgain) {
return invalidator.doneBuilding()
}
const [clientStats, serverStats, serverWebStats] = multiStats.stats
const pagePaths = [
...getPagePathsFromEntrypoints(
'client',
clientStats.compilation.entrypoints
),
...getPagePathsFromEntrypoints(
'server',
serverStats.compilation.entrypoints
),
...(serverWebStats
? getPagePathsFromEntrypoints(
'server-web',
serverWebStats.compilation.entrypoints
)
: []),
]
for (const page of pagePaths) {
const entry = entries[page]
if (!entry) {
continue
}
if (entry.status !== BUILDING) {
continue
}
entry.status = BUILT
doneCallbacks!.emit(page)
}
invalidator.doneBuilding()
})
const pingIntervalTime = Math.max(1000, Math.min(5000, maxInactiveAge))
const disposeHandler = setInterval(function () {
disposeInactiveEntries(watcher, lastClientAccessPages, maxInactiveAge)
}, pingIntervalTime + 1000)
disposeHandler.unref()
function handlePing(pg: string) {
const page = normalizePathSep(pg)
const pageKey = `client${page}`
const entryInfo = entries[pageKey]
let toSend
// If there's no entry, it may have been invalidated and needs to be re-built.
if (!entryInfo) {
// if (page !== lastEntry) client pings, but there's no entry for page
return { invalid: true }
}
// 404 is an on demand entry but when a new page is added we have to refresh the page
if (page === '/_error') {
toSend = { invalid: true }
} else {
toSend = { success: true }
}
// We don't need to maintain active state of anything other than BUILT entries
if (entryInfo.status !== BUILT) return
// If there's an entryInfo
if (!lastClientAccessPages.includes(pageKey)) {
lastClientAccessPages.unshift(pageKey)
// Maintain the buffer max length
if (lastClientAccessPages.length > pagesBufferLength) {
lastClientAccessPages.pop()
}
}
entryInfo.lastActiveTime = Date.now()
entryInfo.dispose = false
return toSend
}
return {
async ensurePage(page: string, clientOnly: boolean) {
let normalizedPagePath: string
try {
normalizedPagePath = normalizePagePath(page)
} catch (err) {
console.error(err)
throw pageNotFoundError(page)
}
let pagePath = await findPageFile(
pagesDir,
normalizedPagePath,
nextConfig.pageExtensions
)
// Default the /_error route to the Next.js provided default page
if (page === '/_error' && pagePath === null) {
pagePath = 'next/dist/pages/_error'
}
if (pagePath === null) {
throw pageNotFoundError(normalizedPagePath)
}
let bundlePath: string
let absolutePagePath: string
if (pagePath.startsWith('next/dist/pages/')) {
bundlePath = page
absolutePagePath = require.resolve(pagePath)
} else {
let pageUrl = pagePath.replace(/\\/g, '/')
pageUrl = `${pageUrl[0] !== '/' ? '/' : ''}${pageUrl
.replace(
new RegExp(`\\.+(?:${nextConfig.pageExtensions.join('|')})$`),
''
)
.replace(/\/index$/, '')}`
pageUrl = pageUrl === '' ? '/' : pageUrl
const bundleFile = normalizePagePath(pageUrl)
bundlePath = posix.join('pages', bundleFile)
absolutePagePath = join(pagesDir, pagePath)
page = posix.normalize(pageUrl)
}
const normalizedPage = normalizePathSep(page)
const isMiddleware = normalizedPage.match(MIDDLEWARE_ROUTE)
const isApiRoute = normalizedPage.match(API_ROUTE) && !isMiddleware
const isServerWeb = !!nextConfig.experimental.concurrentFeatures
const isCustomError = isCustomErrorPage(page)
let entriesChanged = false
const addPageEntry = (type: 'client' | 'server' | 'server-web') => {
return new Promise<void>((resolve, reject) => {
// Makes sure the page that is being kept in on-demand-entries matches the webpack output
const pageKey = `${type}${page}`
const entryInfo = entries[pageKey]
if (entryInfo) {
entryInfo.lastActiveTime = Date.now()
entryInfo.dispose = false
if (entryInfo.status === BUILT) {
resolve()
return
}
doneCallbacks!.once(pageKey, handleCallback)
return
}
entriesChanged = true
entries[pageKey] = {
bundlePath,
absolutePagePath,
status: ADDED,
lastActiveTime: Date.now(),
dispose: false,
}
doneCallbacks!.once(pageKey, handleCallback)
function handleCallback(err: Error) {
if (err) return reject(err)
resolve()
}
})
}
const isClientOrMiddleware = clientOnly || isMiddleware
const promise = isApiRoute
? addPageEntry('server')
: isClientOrMiddleware
? addPageEntry('client')
: Promise.all([
addPageEntry('client'),
addPageEntry(
isServerWeb && !isCustomError ? 'server-web' : 'server'
),
])
if (entriesChanged) {
reportTrigger(
isApiRoute
? `${normalizedPage} (server only)`
: isClientOrMiddleware
? `${normalizedPage} (client only)`
: normalizedPage
)
invalidator.invalidate()
}
return promise
},
onHMR(client: ws) {
client.addEventListener('message', ({ data }) => {
data = typeof data !== 'string' ? data.toString() : data
try {
const parsedData = JSON.parse(data)
if (parsedData.event === 'ping') {
const result = handlePing(parsedData.page)
client.send(
JSON.stringify({
...result,
event: 'pong',
})
)
}
} catch (_) {}
})
},
}
}
function disposeInactiveEntries(
_watcher: any,
lastClientAccessPages: any,
maxInactiveAge: number
) {
Object.keys(entries).forEach((page) => {
const { lastActiveTime, status, dispose } = entries[page]
// Skip pages already scheduled for disposing
if (dispose) return
// This means this entry is currently building or just added
// We don't need to dispose those entries.
if (status !== BUILT) return
// We should not build the last accessed page even we didn't get any pings
// Sometimes, it's possible our XHR ping to wait before completing other requests.
// In that case, we should not dispose the current viewing page
if (lastClientAccessPages.includes(page)) return
if (lastActiveTime && Date.now() - lastActiveTime > maxInactiveAge) {
entries[page].dispose = true
}
})
}
// Make sure only one invalidation happens at a time
// Otherwise, webpack hash gets changed and it'll force the client to reload.
class Invalidator {
private multiCompiler: webpack.MultiCompiler
private watcher: any
private building: boolean
public rebuildAgain: boolean
constructor(watcher: any, multiCompiler: webpack.MultiCompiler) {
this.multiCompiler = multiCompiler
this.watcher = watcher
// contains an array of types of compilers currently building
this.building = false
this.rebuildAgain = false
}
invalidate() {
// If there's a current build is processing, we won't abort it by invalidating.
// (If aborted, it'll cause a client side hard reload)
// But let it to invalidate just after the completion.
// So, it can re-build the queued pages at once.
if (this.building) {
this.rebuildAgain = true
return
}
this.building = true
this.watcher.invalidate()
}
startBuilding() {
this.building = true
}
doneBuilding() {
this.building = false
if (this.rebuildAgain) {
this.rebuildAgain = false
this.invalidate()
}
}
}