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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 * as Core from '../core/core.js';\nimport type * as Lantern from '../types/types.js';\n\nimport {TCPConnection} from './TCPConnection.js';\n\nconst DEFAULT_SERVER_RESPONSE_TIME = 30;\nconst TLS_SCHEMES = ['https', 'wss'];\n\n// Each origin can have 6 simultaneous connections open\n// https://cs.chromium.org/chromium/src/net/socket/client_socket_pool_manager.cc?type=cs&q=\"int+g_max_sockets_per_group\"\nconst CONNECTIONS_PER_ORIGIN = 6;\n\nexport class ConnectionPool {\n  options: Required<Lantern.Simulation.Options>;\n  records: Lantern.NetworkRequest[];\n  connectionsByOrigin: Map<string, TCPConnection[]>;\n  connectionsByRequest: Map<Lantern.NetworkRequest, TCPConnection>;\n  _connectionsInUse: Set<TCPConnection>;\n  connectionReusedByRequestId: Map<string, boolean>;\n\n  constructor(records: Lantern.NetworkRequest[], options: Required<Lantern.Simulation.Options>) {\n    this.options = options;\n\n    this.records = records;\n    this.connectionsByOrigin = new Map();\n    this.connectionsByRequest = new Map();\n    this._connectionsInUse = new Set();\n    this.connectionReusedByRequestId = Core.NetworkAnalyzer.estimateIfConnectionWasReused(records, {\n      forceCoarseEstimates: true,\n    });\n\n    this.initializeConnections();\n  }\n\n  connectionsInUse(): TCPConnection[] {\n    return Array.from(this._connectionsInUse);\n  }\n\n  initializeConnections(): void {\n    const connectionReused = this.connectionReusedByRequestId;\n    const additionalRttByOrigin = this.options.additionalRttByOrigin;\n    const serverResponseTimeByOrigin = this.options.serverResponseTimeByOrigin;\n\n    const recordsByOrigin = Core.NetworkAnalyzer.groupByOrigin(this.records);\n    for (const [origin, requests] of recordsByOrigin.entries()) {\n      const connections = [];\n      const additionalRtt = additionalRttByOrigin.get(origin) || 0;\n      const responseTime = serverResponseTimeByOrigin.get(origin) || DEFAULT_SERVER_RESPONSE_TIME;\n\n      for (const request of requests) {\n        if (connectionReused.get(request.requestId)) {\n          continue;\n        }\n\n        const isTLS = TLS_SCHEMES.includes(request.parsedURL.scheme);\n        const isH2 = request.protocol === 'h2';\n        const connection = new TCPConnection(\n            this.options.rtt + additionalRtt,\n            this.options.throughput,\n            responseTime,\n            isTLS,\n            isH2,\n        );\n\n        connections.push(connection);\n      }\n\n      if (!connections.length) {\n        throw new Core.LanternError(`Could not find a connection for origin: ${origin}`);\n      }\n\n      // Make sure each origin has minimum number of connections available for max throughput.\n      // But only if it's not over H2 which maximizes throughput already.\n      const minConnections = connections[0].isH2() ? 1 : CONNECTIONS_PER_ORIGIN;\n      while (connections.length < minConnections) {\n        connections.push(connections[0].clone());\n      }\n\n      this.connectionsByOrigin.set(origin, connections);\n    }\n  }\n\n  findAvailableConnectionWithLargestCongestionWindow(connections: TCPConnection[]): TCPConnection|null {\n    let maxConnection: TCPConnection|null = null;\n    for (let i = 0; i < connections.length; i++) {\n      const connection = connections[i];\n\n      // Connections that are in use are never available.\n      if (this._connectionsInUse.has(connection)) {\n        continue;\n      }\n\n      // This connection is a match and is available! Update our max if it has a larger congestionWindow\n      const currentMax = (maxConnection?.congestionWindow) || -Infinity;\n      if (connection.congestionWindow > currentMax) {\n        maxConnection = connection;\n      }\n    }\n\n    return maxConnection;\n  }\n\n  /**\n   * This method finds an available connection to the origin specified by the network request or null\n   * if no connection was available. If returned, connection will not be available for other network\n   * records until release is called.\n   */\n  acquire(request: Lantern.NetworkRequest): TCPConnection|null {\n    if (this.connectionsByRequest.has(request)) {\n      throw new Core.LanternError('Record already has a connection');\n    }\n\n    const origin = request.parsedURL.securityOrigin;\n    const connections = this.connectionsByOrigin.get(origin) || [];\n    const connectionToUse = this.findAvailableConnectionWithLargestCongestionWindow(connections);\n\n    if (!connectionToUse) {\n      return null;\n    }\n\n    this._connectionsInUse.add(connectionToUse);\n    this.connectionsByRequest.set(request, connectionToUse);\n    return connectionToUse;\n  }\n\n  /**\n   * Return the connection currently being used to fetch a request. If no connection\n   * currently being used for this request, an error will be thrown.\n   */\n  acquireActiveConnectionFromRequest(request: Lantern.NetworkRequest): TCPConnection {\n    const activeConnection = this.connectionsByRequest.get(request);\n    if (!activeConnection) {\n      throw new Core.LanternError('Could not find an active connection for request');\n    }\n\n    return activeConnection;\n  }\n\n  release(request: Lantern.NetworkRequest): void {\n    const connection = this.connectionsByRequest.get(request);\n    this.connectionsByRequest.delete(request);\n    if (connection) {\n      this._connectionsInUse.delete(connection);\n    }\n  }\n}\n"]}