在heroku dyno中从节点到python进行http调用 [英] Make http call from node to python in heroku dyno

问题描述

我继承了一个包含NodeJS部分和Python部分的存储库。项目结构是这样的：NodeJS位于存储库的根目录，Python片段位于Python文件夹中：

I've inherited a repository that contains both a NodeJS part and a Python part. The project structure is such that the NodeJS is at the root of the repository, and the Python pieces are in a Python folder:

root
|- app
  |- some.js
  |- files.js
|- Python
  |- other.py
  |- files.py

我已经设置了一个Heroku dyno来为Python服务器和NodeJS服务器提供服务，在我的Procfile中执行此操作（基于这篇较旧的文章）：

I've set up a Heroku dyno to serve both a Python server and a NodeJS server, by doing this in my Procfile (based loosely on this older article):

web: npm start
python: sh -c 'cd ./Python/ && export PYTHONPATH=. && python other.py'

python项目设置为使用端口2001.它是一个 Bottle 应用程序以及启动服务器时，我通过此端口（取自Heroku设置）。

The python project is set up to use port 2001. It's a Bottle application and on starting the server I pass in this port (taken from the Heroku settings).

在我的日志记录中，我可以看到两者都成功启动。简化：

In my logging, I can see that both are started successfully. Simplified:

Bottle v0.12.13 server starting up (using WaitressServer())... 
Listening on http://localhost:2001/ 
Server running at: http://<guid>:7667 

当我请求我的应用程序的根时，我收到来自NodeJS服务器的回复。但是，对于某些路由，我想调用Python部分。我通过使用Node的 http 在本地成功完成了此操作。但是，在Heroku上执行此操作时，我收到以下错误：

When I request the root of my application, I get a reply from the NodeJS server. However, for some routes, I want to make a call to the Python part. I've succesfully done this locally, by using Node's http. However, when doing this on Heroku, I receive the following error:

connect ECONNREFUSED 127.0.0.1:2001

当我在Heroku中本地运行此项目时（通过CLI工具 heroku local

When I run this project locally in Heroku (via the CLI tool heroku local), it works perfectly. Any ideas on how I can get this to work?

推荐答案

终于找到了它。 Dynos无法通过HTTP相互通信，只能通过队列进行通信。我无法再在文档中找到它，但他们在某处说明它。

Finally found it. Dynos can't communicate with each other via HTTP, only via queues. I can't find it in the docs anymore, but they state it somewhere.

因此，我将Procfile更改为只运行一个dyno：

So I changed my Procfile to only run one dyno:

web: npm start & sh -c 'cd ./Python/ && export PYTHONPATH=. && python other.py'

现在我可以打电话给 127.0.0.1 ：2001 没有任何问题。

Now I can make my call to 127.0.0.1:2001 without any problems.

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