javascript - 如何修复 Chrome 扩展原生消息的“原生主机已退出”？

Question

我花了两天时间阅读/尝试我能找到/想到的所有可能的解决方案，但它们都没有奏效，我完全被困住了。任何方向将不胜感激！

我正在尝试通过正在开发的 Chrome 扩展程序读取 Chrome 浏览历史记录。由于这个历史文件（一个 sqlite3 数据库）位于本地，我需要为我的扩展设置本地消息传递来读取它。我正在使用 Chrome 84，Ubuntu。我从 Chrome 开发者网站上遵循了这个例子，但它总是Failed to connect: Native host has exited. 我在chrome-extension://knldjmfmopnpolahpmmgbagdohdnhkik/main.html.

1. 我的本机消息传递主机（native-messaging-example-host文件，位于本文底部）是用 python 2 编写的，但是 chrome 是如何知道将其作为 python 2 运行的呢？

2. 本机消息传递主机如何向我公开的页面发送消息？我阅读了它的代码，但我并不熟悉它使用的所有模块和线程。

3. Chrome网站提到这Native host has exited可能是由于“在 Chrome 读取消息之前，到本机消息传递主机的管道已损坏。这很可能是从您的本机消息传递主机发起的。”，但它没有提到如何修复它。我尝试（1）将其权限从 更改-rwxr--r--为-rwxrwxrwx，（2）将 JSON 文件移动到更容易访问的文件夹并path相应地更改值。我的问题是，导致“在 Chrome 读取消息之前，到本机消息传递主机的管道已损坏”的可能原因是什么？

我的 /home/username/.config/google-chrome/NativeMessagingHosts/com.google.chrome.example.echo.json：

{
  "name": "com.google.chrome.example.echo",
  "description": "Chrome Native Messaging API Example Host",
  "path": "/home/moon/BrowserExtensions/nativeMessage/host/native-messaging-example-host",
  "type": "stdio",
  "allowed_origins": [
    "chrome-extension://knldjmfmopnpolahpmmgbagdohdnhkik/"
  ]
}

我的 app 文件夹与上面提到的示例完全相同，它有 4 个文件：icon-128.png main.html main.js manifest.json. manifest.json: _

{
  "key": "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDcBHwzDvyBQ6bDppkIs9MP4ksKqCMyXQ/A52JivHZKh4YO/9vJsT3oaYhSpDCE9RPocOEQvwsHsFReW2nUEc6OLLyoCFFxIb7KkLGsmfakkut/fFdNJYh0xOTbSN8YvLWcqph09XAY2Y/f0AL7vfO1cuCqtkMt8hFrBGWxDdf9CQIDAQAB",
  "name": "Native Messaging Example",
  "version": "1.0",
  "manifest_version": 2,
  "description": "Send a message to a native application.",
  "app": {
    "launch": {
      "local_path": "main.html"
    }
  },
  "icons": {
    "128": "icon-128.png"
  },
  "permissions": [
    "nativeMessaging"
  ]
}

main.js文件：

var port = null;

var getKeys = function(obj){
   var keys = [];
   for(var key in obj){
      keys.push(key);
   }
   return keys;
}


function appendMessage(text) {
  document.getElementById('response').innerHTML += "<p>" + text + "</p>";
}

function updateUiState() {
  if (port) {
    document.getElementById('connect-button').style.display = 'none';
    document.getElementById('input-text').style.display = 'block';
    document.getElementById('send-message-button').style.display = 'block';
  } else {
    document.getElementById('connect-button').style.display = 'block';
    document.getElementById('input-text').style.display = 'none';
    document.getElementById('send-message-button').style.display = 'none';
  }
}

function sendNativeMessage() {
  message = {"text": document.getElementById('input-text').value};
  port.postMessage(message);
  appendMessage("Sent message: <b>" + JSON.stringify(message) + "</b>");
}

function onNativeMessage(message) {
  appendMessage("Received message: <b>" + JSON.stringify(message) + "</b>");
}

function onDisconnected() {
  appendMessage("Failed to connect: " + chrome.runtime.lastError.message);
  port = null;
  updateUiState();
}

function connect() {
  var hostName = "com.google.chrome.example.echo";
  appendMessage("Connecting to native messaging host <b>" + hostName + "</b>")
  port = chrome.runtime.connectNative(hostName);
  port.onMessage.addListener(onNativeMessage);
  port.onDisconnect.addListener(onDisconnected);
  updateUiState();
}

document.addEventListener('DOMContentLoaded', function () {
  document.getElementById('connect-button').addEventListener(
      'click', connect);
  document.getElementById('send-message-button').addEventListener(
      'click', sendNativeMessage);
  updateUiState();
});

native-messaging-example-host文件：

import struct
import sys
import threading
import Queue

try:
  import Tkinter
  import tkMessageBox
except ImportError:
  Tkinter = None

# On Windows, the default I/O mode is O_TEXT. Set this to O_BINARY
# to avoid unwanted modifications of the input/output streams.
if sys.platform == "win32":
  import os, msvcrt
  msvcrt.setmode(sys.stdin.fileno(), os.O_BINARY)
  msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)

# Helper function that sends a message to the webapp.
def send_message(message):
   # Write message size.
  sys.stdout.write(struct.pack('I', len(message)))
  # Write the message itself.
  sys.stdout.write(message)
  sys.stdout.flush()

# Thread that reads messages from the webapp.
def read_thread_func(queue):
  message_number = 0
  while 1:
    # Read the message length (first 4 bytes).
    text_length_bytes = sys.stdin.read(4)

    if len(text_length_bytes) == 0:
      if queue:
        queue.put(None)
      sys.exit(0)

    # Unpack message length as 4 byte integer.
    text_length = struct.unpack('i', text_length_bytes)[0]

    # Read the text (JSON object) of the message.
    text = sys.stdin.read(text_length).decode('utf-8')

    if queue:
      queue.put(text)
    else:
      # In headless mode just send an echo message back.
      send_message('{"echo": %s}' % text)

if Tkinter:
  class NativeMessagingWindow(Tkinter.Frame):
    def __init__(self, queue):
      self.queue = queue

      Tkinter.Frame.__init__(self)
      self.pack()

      self.text = Tkinter.Text(self)
      self.text.grid(row=0, column=0, padx=10, pady=10, columnspan=2)
      self.text.config(state=Tkinter.DISABLED, height=10, width=40)

      self.messageContent = Tkinter.StringVar()
      self.sendEntry = Tkinter.Entry(self, textvariable=self.messageContent)
      self.sendEntry.grid(row=1, column=0, padx=10, pady=10)

      self.sendButton = Tkinter.Button(self, text="Send", command=self.onSend)
      self.sendButton.grid(row=1, column=1, padx=10, pady=10)

      self.after(100, self.processMessages)

    def processMessages(self):
      while not self.queue.empty():
        message = self.queue.get_nowait()
        if message == None:
          self.quit()
          return
        self.log("Received %s" % message)

      self.after(100, self.processMessages)

    def onSend(self):
      text = '{"text": "' + self.messageContent.get() + '"}'
      self.log('Sending %s' % text)
      try:
        send_message(text)
      except IOError:
        tkMessageBox.showinfo('Native Messaging Example',
                              'Failed to send message.')
        sys.exit(1)

    def log(self, message):
      self.text.config(state=Tkinter.NORMAL)
      self.text.insert(Tkinter.END, message + "\n")
      self.text.config(state=Tkinter.DISABLED)


def Main():
  if not Tkinter:
    send_message('"Tkinter python module wasn\'t found. Running in headless ' +
                 'mode. Please consider installing Tkinter."')
    read_thread_func(None)
    sys.exit(0)

  queue = Queue.Queue()

  main_window = NativeMessagingWindow(queue)
  main_window.master.title('Native Messaging Example')

  thread = threading.Thread(target=read_thread_func, args=(queue,))
  thread.daemon = True
  thread.start()

  main_window.mainloop()

  sys.exit(0)


if __name__ == '__main__':
  Main()

谢谢！！！

标签： javascriptjsongoogle-chromegoogle-chrome-extensionchrome-native-messaging