feat(vanilla): add testing infrastructure and tests (NK-wjnczv)

1 files changed, 495 insertions, 0 deletions

diff --git a/vanilla/node_modules/undici/lib/interceptor/cache.js b/vanilla/node_modules/undici/lib/interceptor/cache.js
new file mode 100644
index 0000000..81d7cb1
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/interceptor/cache.js
@@ -0,0 +1,495 @@
+'use strict'
+
+const assert = require('node:assert')
+const { Readable } = require('node:stream')
+const util = require('../core/util')
+const CacheHandler = require('../handler/cache-handler')
+const MemoryCacheStore = require('../cache/memory-cache-store')
+const CacheRevalidationHandler = require('../handler/cache-revalidation-handler')
+const { assertCacheStore, assertCacheMethods, makeCacheKey, normalizeHeaders, parseCacheControlHeader } = require('../util/cache.js')
+const { AbortError } = require('../core/errors.js')
+
+/**
+ * @param {(string | RegExp)[] | undefined} origins
+ * @param {string} name
+ */
+function assertCacheOrigins (origins, name) {
+  if (origins === undefined) return
+  if (!Array.isArray(origins)) {
+    throw new TypeError(`expected ${name} to be an array or undefined, got ${typeof origins}`)
+  }
+  for (let i = 0; i < origins.length; i++) {
+    const origin = origins[i]
+    if (typeof origin !== 'string' && !(origin instanceof RegExp)) {
+      throw new TypeError(`expected ${name}[${i}] to be a string or RegExp, got ${typeof origin}`)
+    }
+  }
+}
+
+const nop = () => {}
+
+/**
+ * @typedef {(options: import('../../types/dispatcher.d.ts').default.DispatchOptions, handler: import('../../types/dispatcher.d.ts').default.DispatchHandler) => void} DispatchFn
+ */
+
+/**
+ * @param {import('../../types/cache-interceptor.d.ts').default.GetResult} result
+ * @param {import('../../types/cache-interceptor.d.ts').default.CacheControlDirectives | undefined} cacheControlDirectives
+ * @param {import('../../types/dispatcher.d.ts').default.RequestOptions} opts
+ * @returns {boolean}
+ */
+function needsRevalidation (result, cacheControlDirectives, { headers = {} }) {
+  // Always revalidate requests with the no-cache request directive.
+  if (cacheControlDirectives?.['no-cache']) {
+    return true
+  }
+
+  // Always revalidate requests with unqualified no-cache response directive.
+  if (result.cacheControlDirectives?.['no-cache'] && !Array.isArray(result.cacheControlDirectives['no-cache'])) {
+    return true
+  }
+
+  // Always revalidate requests with conditional headers.
+  if (headers['if-modified-since'] || headers['if-none-match']) {
+    return true
+  }
+
+  return false
+}
+
+/**
+ * @param {import('../../types/cache-interceptor.d.ts').default.GetResult} result
+ * @param {import('../../types/cache-interceptor.d.ts').default.CacheControlDirectives | undefined} cacheControlDirectives
+ * @returns {boolean}
+ */
+function isStale (result, cacheControlDirectives) {
+  const now = Date.now()
+  if (now > result.staleAt) {
+    // Response is stale
+    if (cacheControlDirectives?.['max-stale']) {
+      // There's a threshold where we can serve stale responses, let's see if
+      //  we're in it
+      // https://www.rfc-editor.org/rfc/rfc9111.html#name-max-stale
+      const gracePeriod = result.staleAt + (cacheControlDirectives['max-stale'] * 1000)
+      return now > gracePeriod
+    }
+
+    return true
+  }
+
+  if (cacheControlDirectives?.['min-fresh']) {
+    // https://www.rfc-editor.org/rfc/rfc9111.html#section-5.2.1.3
+
+    // At this point, staleAt is always > now
+    const timeLeftTillStale = result.staleAt - now
+    const threshold = cacheControlDirectives['min-fresh'] * 1000
+
+    return timeLeftTillStale <= threshold
+  }
+
+  return false
+}
+
+/**
+ * Check if we're within the stale-while-revalidate window for a stale response
+ * @param {import('../../types/cache-interceptor.d.ts').default.GetResult} result
+ * @returns {boolean}
+ */
+function withinStaleWhileRevalidateWindow (result) {
+  const staleWhileRevalidate = result.cacheControlDirectives?.['stale-while-revalidate']
+  if (!staleWhileRevalidate) {
+    return false
+  }
+
+  const now = Date.now()
+  const staleWhileRevalidateExpiry = result.staleAt + (staleWhileRevalidate * 1000)
+  return now <= staleWhileRevalidateExpiry
+}
+
+/**
+ * @param {DispatchFn} dispatch
+ * @param {import('../../types/cache-interceptor.d.ts').default.CacheHandlerOptions} globalOpts
+ * @param {import('../../types/cache-interceptor.d.ts').default.CacheKey} cacheKey
+ * @param {import('../../types/dispatcher.d.ts').default.DispatchHandler} handler
+ * @param {import('../../types/dispatcher.d.ts').default.RequestOptions} opts
+ * @param {import('../../types/cache-interceptor.d.ts').default.CacheControlDirectives | undefined} reqCacheControl
+ */
+function handleUncachedResponse (
+  dispatch,
+  globalOpts,
+  cacheKey,
+  handler,
+  opts,
+  reqCacheControl
+) {
+  if (reqCacheControl?.['only-if-cached']) {
+    let aborted = false
+    try {
+      if (typeof handler.onConnect === 'function') {
+        handler.onConnect(() => {
+          aborted = true
+        })
+
+        if (aborted) {
+          return
+        }
+      }
+
+      if (typeof handler.onHeaders === 'function') {
+        handler.onHeaders(504, [], nop, 'Gateway Timeout')
+        if (aborted) {
+          return
+        }
+      }
+
+      if (typeof handler.onComplete === 'function') {
+        handler.onComplete([])
+      }
+    } catch (err) {
+      if (typeof handler.onError === 'function') {
+        handler.onError(err)
+      }
+    }
+
+    return true
+  }
+
+  return dispatch(opts, new CacheHandler(globalOpts, cacheKey, handler))
+}
+
+/**
+ * @param {import('../../types/dispatcher.d.ts').default.DispatchHandler} handler
+ * @param {import('../../types/dispatcher.d.ts').default.RequestOptions} opts
+ * @param {import('../../types/cache-interceptor.d.ts').default.GetResult} result
+ * @param {number} age
+ * @param {any} context
+ * @param {boolean} isStale
+ */
+function sendCachedValue (handler, opts, result, age, context, isStale) {
+  // TODO (perf): Readable.from path can be optimized...
+  const stream = util.isStream(result.body)
+    ? result.body
+    : Readable.from(result.body ?? [])
+
+  assert(!stream.destroyed, 'stream should not be destroyed')
+  assert(!stream.readableDidRead, 'stream should not be readableDidRead')
+
+  const controller = {
+    resume () {
+      stream.resume()
+    },
+    pause () {
+      stream.pause()
+    },
+    get paused () {
+      return stream.isPaused()
+    },
+    get aborted () {
+      return stream.destroyed
+    },
+    get reason () {
+      return stream.errored
+    },
+    abort (reason) {
+      stream.destroy(reason ?? new AbortError())
+    }
+  }
+
+  stream
+    .on('error', function (err) {
+      if (!this.readableEnded) {
+        if (typeof handler.onResponseError === 'function') {
+          handler.onResponseError(controller, err)
+        } else {
+          throw err
+        }
+      }
+    })
+    .on('close', function () {
+      if (!this.errored) {
+        handler.onResponseEnd?.(controller, {})
+      }
+    })
+
+  handler.onRequestStart?.(controller, context)
+
+  if (stream.destroyed) {
+    return
+  }
+
+  // Add the age header
+  // https://www.rfc-editor.org/rfc/rfc9111.html#name-age
+  const headers = { ...result.headers, age: String(age) }
+
+  if (isStale) {
+    // Add warning header
+    //  https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Warning
+    headers.warning = '110 - "response is stale"'
+  }
+
+  handler.onResponseStart?.(controller, result.statusCode, headers, result.statusMessage)
+
+  if (opts.method === 'HEAD') {
+    stream.destroy()
+  } else {
+    stream.on('data', function (chunk) {
+      handler.onResponseData?.(controller, chunk)
+    })
+  }
+}
+
+/**
+ * @param {DispatchFn} dispatch
+ * @param {import('../../types/cache-interceptor.d.ts').default.CacheHandlerOptions} globalOpts
+ * @param {import('../../types/cache-interceptor.d.ts').default.CacheKey} cacheKey
+ * @param {import('../../types/dispatcher.d.ts').default.DispatchHandler} handler
+ * @param {import('../../types/dispatcher.d.ts').default.RequestOptions} opts
+ * @param {import('../../types/cache-interceptor.d.ts').default.CacheControlDirectives | undefined} reqCacheControl
+ * @param {import('../../types/cache-interceptor.d.ts').default.GetResult | undefined} result
+ */
+function handleResult (
+  dispatch,
+  globalOpts,
+  cacheKey,
+  handler,
+  opts,
+  reqCacheControl,
+  result
+) {
+  if (!result) {
+    return handleUncachedResponse(dispatch, globalOpts, cacheKey, handler, opts, reqCacheControl)
+  }
+
+  const now = Date.now()
+  if (now > result.deleteAt) {
+    // Response is expired, cache store shouldn't have given this to us
+    return dispatch(opts, new CacheHandler(globalOpts, cacheKey, handler))
+  }
+
+  const age = Math.round((now - result.cachedAt) / 1000)
+  if (reqCacheControl?.['max-age'] && age >= reqCacheControl['max-age']) {
+    // Response is considered expired for this specific request
+    //  https://www.rfc-editor.org/rfc/rfc9111.html#section-5.2.1.1
+    return dispatch(opts, handler)
+  }
+
+  const stale = isStale(result, reqCacheControl)
+  const revalidate = needsRevalidation(result, reqCacheControl, opts)
+
+  // Check if the response is stale
+  if (stale || revalidate) {
+    if (util.isStream(opts.body) && util.bodyLength(opts.body) !== 0) {
+      // If body is a stream we can't revalidate...
+      // TODO (fix): This could be less strict...
+      return dispatch(opts, new CacheHandler(globalOpts, cacheKey, handler))
+    }
+
+    // RFC 5861: If we're within stale-while-revalidate window, serve stale immediately
+    // and revalidate in background, unless immediate revalidation is necessary
+    if (!revalidate && withinStaleWhileRevalidateWindow(result)) {
+      // Serve stale response immediately
+      sendCachedValue(handler, opts, result, age, null, true)
+
+      // Start background revalidation (fire-and-forget)
+      queueMicrotask(() => {
+        const headers = {
+          ...opts.headers,
+          'if-modified-since': new Date(result.cachedAt).toUTCString()
+        }
+
+        if (result.etag) {
+          headers['if-none-match'] = result.etag
+        }
+
+        if (result.vary) {
+          for (const key in result.vary) {
+            if (result.vary[key] != null) {
+              headers[key] = result.vary[key]
+            }
+          }
+        }
+
+        // Background revalidation - update cache if we get new data
+        dispatch(
+          {
+            ...opts,
+            headers
+          },
+          new CacheHandler(globalOpts, cacheKey, {
+            // Silent handler that just updates the cache
+            onRequestStart () {},
+            onRequestUpgrade () {},
+            onResponseStart () {},
+            onResponseData () {},
+            onResponseEnd () {},
+            onResponseError () {}
+          })
+        )
+      })
+
+      return true
+    }
+
+    let withinStaleIfErrorThreshold = false
+    const staleIfErrorExpiry = result.cacheControlDirectives['stale-if-error'] ?? reqCacheControl?.['stale-if-error']
+    if (staleIfErrorExpiry) {
+      withinStaleIfErrorThreshold = now < (result.staleAt + (staleIfErrorExpiry * 1000))
+    }
+
+    const headers = {
+      ...opts.headers,
+      'if-modified-since': new Date(result.cachedAt).toUTCString()
+    }
+
+    if (result.etag) {
+      headers['if-none-match'] = result.etag
+    }
+
+    if (result.vary) {
+      for (const key in result.vary) {
+        if (result.vary[key] != null) {
+          headers[key] = result.vary[key]
+        }
+      }
+    }
+
+    // We need to revalidate the response
+    return dispatch(
+      {
+        ...opts,
+        headers
+      },
+      new CacheRevalidationHandler(
+        (success, context) => {
+          if (success) {
+            // TODO: successful revalidation should be considered fresh (not give stale warning).
+            sendCachedValue(handler, opts, result, age, context, stale)
+          } else if (util.isStream(result.body)) {
+            result.body.on('error', nop).destroy()
+          }
+        },
+        new CacheHandler(globalOpts, cacheKey, handler),
+        withinStaleIfErrorThreshold
+      )
+    )
+  }
+
+  // Dump request body.
+  if (util.isStream(opts.body)) {
+    opts.body.on('error', nop).destroy()
+  }
+
+  sendCachedValue(handler, opts, result, age, null, false)
+}
+
+/**
+ * @param {import('../../types/cache-interceptor.d.ts').default.CacheOptions} [opts]
+ * @returns {import('../../types/dispatcher.d.ts').default.DispatcherComposeInterceptor}
+ */
+module.exports = (opts = {}) => {
+  const {
+    store = new MemoryCacheStore(),
+    methods = ['GET'],
+    cacheByDefault = undefined,
+    type = 'shared',
+    origins = undefined
+  } = opts
+
+  if (typeof opts !== 'object' || opts === null) {
+    throw new TypeError(`expected type of opts to be an Object, got ${opts === null ? 'null' : typeof opts}`)
+  }
+
+  assertCacheStore(store, 'opts.store')
+  assertCacheMethods(methods, 'opts.methods')
+  assertCacheOrigins(origins, 'opts.origins')
+
+  if (typeof cacheByDefault !== 'undefined' && typeof cacheByDefault !== 'number') {
+    throw new TypeError(`expected opts.cacheByDefault to be number or undefined, got ${typeof cacheByDefault}`)
+  }
+
+  if (typeof type !== 'undefined' && type !== 'shared' && type !== 'private') {
+    throw new TypeError(`expected opts.type to be shared, private, or undefined, got ${typeof type}`)
+  }
+
+  const globalOpts = {
+    store,
+    methods,
+    cacheByDefault,
+    type
+  }
+
+  const safeMethodsToNotCache = util.safeHTTPMethods.filter(method => methods.includes(method) === false)
+
+  return dispatch => {
+    return (opts, handler) => {
+      if (!opts.origin || safeMethodsToNotCache.includes(opts.method)) {
+        // Not a method we want to cache or we don't have the origin, skip
+        return dispatch(opts, handler)
+      }
+
+      // Check if origin is in whitelist
+      if (origins !== undefined) {
+        const requestOrigin = opts.origin.toString().toLowerCase()
+        let isAllowed = false
+
+        for (let i = 0; i < origins.length; i++) {
+          const allowed = origins[i]
+          if (typeof allowed === 'string') {
+            if (allowed.toLowerCase() === requestOrigin) {
+              isAllowed = true
+              break
+            }
+          } else if (allowed.test(requestOrigin)) {
+            isAllowed = true
+            break
+          }
+        }
+
+        if (!isAllowed) {
+          return dispatch(opts, handler)
+        }
+      }
+
+      opts = {
+        ...opts,
+        headers: normalizeHeaders(opts)
+      }
+
+      const reqCacheControl = opts.headers?.['cache-control']
+        ? parseCacheControlHeader(opts.headers['cache-control'])
+        : undefined
+
+      if (reqCacheControl?.['no-store']) {
+        return dispatch(opts, handler)
+      }
+
+      /**
+       * @type {import('../../types/cache-interceptor.d.ts').default.CacheKey}
+       */
+      const cacheKey = makeCacheKey(opts)
+      const result = store.get(cacheKey)
+
+      if (result && typeof result.then === 'function') {
+        return result
+          .then(result => handleResult(dispatch,
+            globalOpts,
+            cacheKey,
+            handler,
+            opts,
+            reqCacheControl,
+            result
+          ))
+      } else {
+        return handleResult(
+          dispatch,
+          globalOpts,
+          cacheKey,
+          handler,
+          opts,
+          reqCacheControl,
+          result
+        )
+      }
+    }
+  }
+}