playwright/src/chromium/crProtocolHelper.ts

/**
 * Copyright 2017 Google Inc. All rights reserved.
 * Modifications copyright (c) Microsoft Corporation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { assert } from '../helper';
import { CRSession } from './crConnection';
import { Protocol } from './protocol';
import * as platform from '../platform';

export function getExceptionMessage(exceptionDetails: Protocol.Runtime.ExceptionDetails): string {
  if (exceptionDetails.exception)
    return exceptionDetails.exception.description || exceptionDetails.exception.value;
  let message = exceptionDetails.text;
  if (exceptionDetails.stackTrace) {
    for (const callframe of exceptionDetails.stackTrace.callFrames) {
      const location = callframe.url + ':' + callframe.lineNumber + ':' + callframe.columnNumber;
      const functionName = callframe.functionName || '<anonymous>';
      message += `\n    at ${functionName} (${location})`;
    }
  }
  return message;
}

export function valueFromRemoteObject(remoteObject: Protocol.Runtime.RemoteObject): any {
  assert(!remoteObject.objectId, 'Cannot extract value when objectId is given');
  if (remoteObject.unserializableValue) {
    if (remoteObject.type === 'bigint' && typeof BigInt !== 'undefined')
      return BigInt(remoteObject.unserializableValue.replace('n', ''));
    switch (remoteObject.unserializableValue) {
      case '-0':
        return -0;
      case 'NaN':
        return NaN;
      case 'Infinity':
        return Infinity;
      case '-Infinity':
        return -Infinity;
      default:
        throw new Error('Unsupported unserializable value: ' + remoteObject.unserializableValue);
    }
  }
  return remoteObject.value;
}

export async function releaseObject(client: CRSession, remoteObject: Protocol.Runtime.RemoteObject) {
  if (!remoteObject.objectId)
    return;
  await client.send('Runtime.releaseObject', {objectId: remoteObject.objectId}).catch(error => {});
}

export async function readProtocolStream(client: CRSession, handle: string, path: string | null): Promise<platform.BufferType> {
  let eof = false;
  let fd: number | undefined;
  if (path)
    fd = await platform.openFdAsync(path, 'w');
  const bufs = [];
  while (!eof) {
    const response = await client.send('IO.read', {handle});
    eof = response.eof;
    const buf = platform.Buffer.from(response.data, response.base64Encoded ? 'base64' : undefined);
    bufs.push(buf);
    if (path)
      await platform.writeFdAsync(fd!, buf);
  }
  if (path)
    await platform.closeFdAsync(fd!);
  await client.send('IO.close', {handle});
  return platform.Buffer.concat(bufs);
}

export function toConsoleMessageLocation(stackTrace: Protocol.Runtime.StackTrace | undefined) {
  return stackTrace && stackTrace.callFrames.length ? {
    url: stackTrace.callFrames[0].url,
    lineNumber: stackTrace.callFrames[0].lineNumber,
    columnNumber: stackTrace.callFrames[0].columnNumber,
  } : {};
}

export function exceptionToError(exceptionDetails: Protocol.Runtime.ExceptionDetails): Error {
  const message = getExceptionMessage(exceptionDetails);
  const err = new Error(message);
  // Don't report clientside error with a node stack attached
  err.stack = 'Error: ' + err.message; // Stack is supposed to contain error message as the first line.
  return err;
}