Question

我尝试使用Firefox56附加组件在Linux-Debian-Stretch-64位下向python3程序发送消息。使用port.postMessage（）函数它可以工作，但我需要有异步程序所以我使用sendNativeMessage（），但即使程序工作，我有消息：

本机应用程序试图发送一个1990837074字节的消息，其中超过1048576字节的限制。 NativeMessaging.jsm：283 _startRead / this.readPromise＆LT; 资源：//gre/modules/NativeMessaging.jsm：283：11

我的后台计划：

var port = browser.runtime.connectNative("gettext");
var first = 0
var portFromCS;

function onExecuted(result) {
  console.log(`appel au content-script fait`);
}

function onError(error) {
  console.log(`Error: ${error}`);
}


browser.commands.onCommand.addListener(function(command) {
  if (command == "toggle-feature") {
    console.log("toggling the feature!");
    var executing = browser.tabs.executeScript({ file: "/content-script.js",  allFrames: false });
    executing.then(onExecuted, onError);
  }
});

function onSend(response) {
  console.log("recu du python" + response);
}

function onBug(error) {
  console.log(`Error python: ${error}`);
}


function connected(p) {
  portFromCS = p;

  portFromCS.onMessage.addListener(function(m) {
      console.log("longueur message = " + m.length)
      if ( m.length > 1 && m.charAt(0) > 'а' && m.length < 100)  {
        var sending = browser.runtime.sendNativeMessage("gettext",m);
        sending.then(onSend, onBug);
      }
  });

}

browser.runtime.onConnect.addListener(connected);

/*
port.onMessage.addListener((response) => {
  console.log("Recu de python" + response);
});*/

应用代码：

#!/usr/bin/python
# -*- coding: utf-8 -*- 
# Note that running python with the `-u` flag is required on Windows,
# in order to ensure that stdin and stdout are opened in binary, rather
# than text, mode.


import sys, json, struct, codecs, subprocess, pymorphy2

# Read a message from stdin and decode it.
def getMessage():
  rawLength = sys.stdin.read(4)
  if len(rawLength) == 0:
      sys.exit(0)
  messageLength = struct.unpack('@I', rawLength)[0]
  message = sys.stdin.read(messageLength)
  return json.loads(message)

# Encode a message for transmission, given its content.
def encodeMessage(messageContent):
  encodedContent = json.dumps(messageContent)
  encodedLength = struct.pack('@I', len(encodedContent))
  return {'length': encodedLength, 'content': encodedContent}

# Send an encoded message to stdout.
def sendMessage(encodedMessage):
  sys.stdout.write(encodedMessage['length'])
  sys.stdout.write(encodedMessage['content'])
  sys.stdout.flush()

morph = pymorphy2.MorphAnalyzer()

while True:
    receivedMessage = ""
    receivedMessage = getMessage()

内容脚本：

var selectedText = getSelection().toString();

var myPort = browser.runtime.connect({name:"port-from-cs"});

myPort.postMessage(selectedText);

的manifest.json：

{

  "description": "Native messaging and Hotkey and content-script messaging",
  "manifest_version": 2,
  "name": "getSelectedTextFromHotkey",
  "version": "1.0",
  "icons": {
    "48": "icons/message.svg"
  },

  "applications": {
    "gecko": {
      "id": "gettext@example.org",
      "strict_min_version": "50.0"
    }
  },

  "background": {
    "scripts": ["background.js"]
  },

  "commands": {
  "toggle-feature": {
    "suggested_key": {
      "default": "Ctrl+Shift+4",
      "linux": "Ctrl+Shift+5"
    },
    "description": "Send the selected text"
  }
},


  "browser_action": {
    "default_icon": "icons/message.svg"
  },

 "content_scripts": [
  {
    "matches": ["<all_urls>"],
    "js": ["content-script.js"]
  }

  ],

  "permissions": [ "<all_urls>","nativeMessaging","webRequest"]

}

python程序提供正确的信息，不向后台程序发送信息。所以，我认为问题来自background.js

你知道错误在哪里吗？

Answer 1

迟到总比不到好。

因为您的应用程序不回复消息，所以Firefox会读取整个标准输入缓冲区（或其他内容）以搜索有效的响应消息。它读取的缓冲区超过最大大小（可能由您的操作系统决定）。由于它仍然找不到有效的消息，因此Firefox认为该应用程序已发送大量消息并引发错误。

这也可能是由于响应无效消息引起的。

解决方案：回复有效的邮件（即用encodeMessage编码并用sendMessage发送）

为什么SendNativeMessage说我尝试发送2 G字节的消息？

1 个答案: