Not able to execute the blockchain

[parul-k]

I have followed these steps to run project but I am not able to execute it:

Step 1: I have cloned the complete project from github.

Step 2: I am using windows 10 so I have opened command prompt and set: SET FLASK_APP=node_server.py flask run

After executing step 2: I see following message on the screen:

• Environment: production WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
  • Debug mode: off
  • Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)

Step 3: When i am typing http://127.0.0.1:5000/ in browser it says:

Internal Server Error The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.

When i checked the trace in command prompt, it says:

HTTPConnectionPool(host='127.0.0.1', port=8000): Max retries exceeded with url: /chain (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x03C0A4A8>: Failed to establish a new connection: [WinError 10061] No connection could be made because the target machine actively refused it')) 127.0.0.1 - - [25/Mar/2020 13:44:49] "GET / HTTP/1.1" 500 -

Kind help in this regard is highly appreciated.

[satwikkansal]

Please make sure env variable is set properly (see this)

And then make sure there's no other process running already on the same ports (5000 and 8000)

[gerardkm94]

Looks like the APP is trying to reach /chain, but with port 8000... it's quite weir. At first, I recommend you to debug and try to catch the Exception when raised. If you can't, you can try to add this at the end of the server.py file:

if __name__ == '__main__': app.run(debug=True, port=8000)

And run into the terminal: python run_app.py instead of flask, and let's see what happens.

Set these variables as well,

            "FLASK_APP": "app.py",
            "FLASK_ENV": "development",
            "FLASK_DEBUG": "0"

[parul-k]

Looks like the APP is trying to reach /chain, but with port 8000... it's quite weir. At first, I recommend you to debug and try to catch the Exception when raised. If you can't, you can try to add this at the end of the server.py file:

if __name__ == '__main__': app.run(debug=True, port=8000)

And run into the terminal: python run_app.py instead of flask, and let's see what happens.

Set these variables as well,

            "FLASK_APP": "app.py",
            "FLASK_ENV": "development",
            "FLASK_DEBUG": "0"

Thanks for your kind response, I am able to see the following screen after running python run_app.py but its not doing anything, what about node_server.py !! Do I need to run that also?

[gerardkm94]

Yes, my mistake. Add if __name... to node_server.py and the, python node_server.py. Is not necessary to make python run_app.py.

[parul-k]

Yes, my mistake. Add if __name... to node_server.py and the, python node_server.py. Is not necessary to make python run_app.py.

if I am running, run_app.py with following code, from app import app app.run(debug=True) it displays:

requests.exceptions.ConnectionError requests.exceptions.ConnectionError: HTTPConnectionPool(host='127.0.0.1', port=8000): Max retries exceeded with url: /chain (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x041A8DA8>: Failed to establish a new connection: [WinError 10061] No connection could be made because the target machine actively refused it'))

but if run the same file with, from app import app app.run(debug=True, port=8000) I am able to see the following, what is happening I am not getting: YourNet: Decentralized content sharing......

[parul-k]

Modified node_server.py file and added: if name == 'main': app.run(debug=True, port=8000) but it is displaying the following:

[satwikkansal]

Your issue seems similar to https://github.com/satwikkansal/python_blockchain_app/issues/25

[parul-k]

Your issue seems similar to #25

You are right but I tried everything on referred page, still it says page not found.. This is why in my case run_app.py is running fine on port 5000 but node_server.py is saying 404 Not Found.. How to check whether flask is running node_server.py as a Server or web application, any suggestions ? This is what I am doing: and result is

[satwikkansal]

The web app is available at port 5000, not 8000. So this is expected behavior.

[satwikkansal]

Did you try running web app after this?

[parul-k]

The web app is available at port 5000, not 8000. So this is expected behavior.

Above code is for NODE SERVER

[parul-k]

Did you try running web app after this?

WEB APP is running fine

Problem is of NODE SERVER

[satwikkansal]

Did you create some test transactions using the web app? What error did you get?

[parul-k]

Did you create some test transactions using the web app? What error did you get?

Something worked finally, Instead of writing http://127.0.0.1:8000/ which is saying Page Not Found, I wrote: http://127.0.0.1:8000/mine It said nothing to mine http://127.0.0.1:5000/ opened and some text was entered http://127.0.0.1:8000/mine displayed: Block #1 is mined. After I clicked sync, it displayed my data.. This is how it was meant to be executed !!

[satwikkansal]

This is exactly what's written in the instructions here https://github.com/satwikkansal/python_blockchain_app#instructions-to-run

Anyways, closing the issue.

[parul-k]

This is exactly what's written in the instructions here https://github.com/satwikkansal/python_blockchain_app#instructions-to-run

Anyways, closing the issue.

Thanks a lot for your kind support ..