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{"version":3,"file":"DNSCache.js","sourceRoot":"","sources":["../../../../../../../../front_end/models/trace/lantern/simulation/DNSCache.ts"],"names":[],"mappings":"AAAA,4DAA4D;AAC5D,yEAAyE;AACzE,6BAA6B;AAI7B,wGAAwG;AACxG,yHAAyH;AACzH,yHAAyH;AACzH,mGAAmG;AACnG,oGAAoG;AACpG,MAAM,6BAA6B,GAAG,CAAC,CAAC;AAExC,MAAM,QAAQ;IACZ,MAAM,CAAC,aAAa,GAAG,6BAA6B,CAAC;IAErD,GAAG,CAAS;IACZ,mBAAmB,CAAoC;IAEvD,YAAY,EAAC,GAAG,EAAgB;QAC9B,IAAI,CAAC,GAAG,GAAG,GAAG,CAAC;QACf,IAAI,CAAC,mBAAmB,GAAG,IAAI,GAAG,EAAE,CAAC;IACvC,CAAC;IAED,sBAAsB,CAClB,OAA+B,EAAE,OAA6D;QAChG,MAAM,EAAC,WAAW,GAAG,CAAC,EAAE,iBAAiB,GAAG,KAAK,EAAC,GAAG,OAAO,IAAI,EAAE,CAAC;QAEnE,MAAM,MAAM,GAAG,OAAO,CAAC,SAAS,CAAC,IAAI,CAAC;QACtC,MAAM,UAAU,GAAG,IAAI,CAAC,mBAAmB,CAAC,GAAG,CAAC,MAAM,CAAC,CAAC;QACxD,IAAI,iBAAiB,GAAG,IAAI,CAAC,GAAG,GAAG,QAAQ,CAAC,aAAa,CAAC;QAC1D,IAAI,UAAU,EAAE,CAAC;YACf,MAAM,yBAAyB,GAAG,IAAI,CAAC,GAAG,CAAC,UAAU,CAAC,UAAU,GAAG,WAAW,EAAE,CAAC,CAAC,CAAC;YACnF,iBAAiB,GAAG,IAAI,CAAC,GAAG,CAAC,yBAAyB,EAAE,iBAAiB,CAAC,CAAC;QAC7E,CAAC;QAED,MAAM,UAAU,GAAG,WAAW,GAAG,iBAAiB,CAAC;QACnD,IAAI,iBAAiB,EAAE,CAAC;YACtB,IAAI,CAAC,6BAA6B,CAAC,OAAO,EAAE,UAAU,CAAC,CAAC;QAC1D,CAAC;QAED,OAAO,iBAAiB,CAAC;IAC3B,CAAC;IAED,6BAA6B,CAAC,OAA+B,EAAE,UAAkB;QAC/E,MAAM,MAAM,GAAG,OAAO,CAAC,SAAS,CAAC,IAAI,CAAC;QACtC,MAAM,UAAU,GAAG,IAAI,CAAC,mBAAmB,CAAC,GAAG,CAAC,MAAM,CAAC,IAAI,EAAC,UAAU,EAAC,CAAC;QACxE,UAAU,CAAC,UAAU,GAAG,IAAI,CAAC,GAAG,CAAC,UAAU,CAAC,UAAU,EAAE,UAAU,CAAC,CAAC;QACpE,IAAI,CAAC,mBAAmB,CAAC,GAAG,CAAC,MAAM,EAAE,UAAU,CAAC,CAAC;IACnD,CAAC;IAED;;;OAGG;IACH,aAAa,CAAC,MAAc,EAAE,UAAkB;QAC9C,IAAI,CAAC,mBAAmB,CAAC,GAAG,CAAC,MAAM,EAAE,EAAC,UAAU,EAAC,CAAC,CAAC;IACrD,CAAC;;AAGH,OAAO,EAAC,QAAQ,EAAC,CAAC","sourcesContent":["// Copyright 2024 The Chromium Authors. All rights reserved.\n// Use of this source code is governed by a BSD-style license that can be\n// found in the LICENSE file.\n\nimport type * as Lantern from '../types/types.js';\n\n// A DNS lookup will usually take ~1-2 roundtrips of connection latency plus the extra DNS routing time.\n// Example: https://www.webpagetest.org/result/180703_3A_e33ec79747c002ed4d7bcbfc81462203/1/details/#waterfall_view_step1\n// Example: https://www.webpagetest.org/result/180707_1M_89673eb633b5d98386de95dfcf9b33d5/1/details/#waterfall_view_step1\n// DNS is highly variable though, many times it's a little more than 1, but can easily be 4-5x RTT.\n// We'll use 2 since it seems to give the most accurate results on average, but this can be tweaked.\nconst DNS_RESOLUTION_RTT_MULTIPLIER = 2;\n\nclass DNSCache {\n  static rttMultiplier = DNS_RESOLUTION_RTT_MULTIPLIER;\n\n  rtt: number;\n  resolvedDomainNames: Map<string, {resolvedAt: number}>;\n\n  constructor({rtt}: {rtt: number}) {\n    this.rtt = rtt;\n    this.resolvedDomainNames = new Map();\n  }\n\n  getTimeUntilResolution(\n      request: Lantern.NetworkRequest, options?: {requestedAt?: number, shouldUpdateCache?: boolean}): number {\n    const {requestedAt = 0, shouldUpdateCache = false} = options || {};\n\n    const domain = request.parsedURL.host;\n    const cacheEntry = this.resolvedDomainNames.get(domain);\n    let timeUntilResolved = this.rtt * DNSCache.rttMultiplier;\n    if (cacheEntry) {\n      const timeUntilCachedIsResolved = Math.max(cacheEntry.resolvedAt - requestedAt, 0);\n      timeUntilResolved = Math.min(timeUntilCachedIsResolved, timeUntilResolved);\n    }\n\n    const resolvedAt = requestedAt + timeUntilResolved;\n    if (shouldUpdateCache) {\n      this.updateCacheResolvedAtIfNeeded(request, resolvedAt);\n    }\n\n    return timeUntilResolved;\n  }\n\n  updateCacheResolvedAtIfNeeded(request: Lantern.NetworkRequest, resolvedAt: number): void {\n    const domain = request.parsedURL.host;\n    const cacheEntry = this.resolvedDomainNames.get(domain) || {resolvedAt};\n    cacheEntry.resolvedAt = Math.min(cacheEntry.resolvedAt, resolvedAt);\n    this.resolvedDomainNames.set(domain, cacheEntry);\n  }\n\n  /**\n   * Forcefully sets the DNS resolution time for a request.\n   * Useful for testing and alternate execution simulations.\n   */\n  setResolvedAt(domain: string, resolvedAt: number): void {\n    this.resolvedDomainNames.set(domain, {resolvedAt});\n  }\n}\n\nexport {DNSCache};\n"]}