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Importing eventlet returns "socket.error: protocol not found" #370

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minglethepringle opened this issue Jan 2, 2017 · 3 comments
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Importing eventlet returns "socket.error: protocol not found" #370

minglethepringle opened this issue Jan 2, 2017 · 3 comments
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@minglethepringle
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minglethepringle commented Jan 2, 2017 •
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I installed Eventlet via pip: pip install eventlet. I'm running GNURoot Debian on Android.

I then went into the Python shell and did import eventlet. There, it gave me an error message:

root@localhost:~/flaskprojects/testing# python
iPython 2.7.13 (default, Jan  1 2017, 23:23:59)
[GCC 4.9.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import eventlet
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/eventlet/__init__.py", line 15, in <module>
    from eventlet import convenience
  File "/usr/local/lib/python2.7/dist-packages/eventlet/convenience.py", line 6, in <module>
    from eventlet.green import socket
  File "/usr/local/lib/python2.7/dist-packages/eventlet/green/socket.py", line 28, in <module>
    from eventlet.support import greendns
  File "/usr/local/lib/python2.7/dist-packages/eventlet/support/greendns.py", line 69, in <module>
    setattr(dns.rdtypes.IN, pkg, import_patched('dns.rdtypes.IN.' + pkg))
  File "/usr/local/lib/python2.7/dist-packages/eventlet/support/greendns.py", line 59, in import_patched
    return patcher.import_patched(module_name, **modules)
  File "/usr/local/lib/python2.7/dist-packages/eventlet/patcher.py", line 119, in import_patched
    *additional_modules + tuple(kw_additional_modules.items()))
  File "/usr/local/lib/python2.7/dist-packages/eventlet/patcher.py", line 93, in inject
    module = __import__(module_name, {}, {}, module_name.split('.')[:-1])
  File "/usr/local/lib/python2.7/dist-packages/eventlet/support/dns/rdtypes/IN/WKS.py", line 23, in <module>
    _proto_tcp = socket.getprotobyname('tcp')
socket.error: protocol not found
>>>

I see socket, so it might be worthwhile mentioning that I'm using eventlet for a Flask + Socket.IO program.

Code:

from flask import Flask, request, render_template
from flask_socketio import SocketIO
from flask_cors import CORS, cross_origin
app = Flask(__name__)
app.config['SECRET_KEY']='secret!'
socketio = SocketIO(app)
STATUS = "i am an empty string"

import eventlet
eventlet.monkey_patch()

@socketio.on('message')
def handle_message(message):
    print(message)
    global STATUS
    if message == "READY_TO_RECEIVE":
        STATUS = "READY"
    else:
        STATUS = "ERROR"
    print(STATUS)

@socketio.on('status')
def handle_message_status(status):
    print(status)

@app.route("/login", methods=["GET", "POST"])
@cross_origin()
def login():
    if request.method == "POST":
        print("THIS IS POST REQUEST!")
        data = request.data
        print(data)
        print(STATUS)

        #if STATUS == "READY":
        socketio.emit("message", data)

        return 'success'

    else:
        return "THIS IS GET REQUEST!"

@app.route("/")
def index():
    return "<html><body><h1>Hellooooooooooo</h1></body></html>"

@app.route("/user/<username>")
def showusername(username):
    return "Welcome back, %s" % username

@app.route("/post/<int:post_id>")
def showpost(post_id):
    return "Post #%d" % post_id



if __name__ == '__main__':
    CORS(app)
    socketio.run(app, host='0.0.0.0', debug = False, use_reloader=False)
@temoto
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temoto commented Jan 2, 2017

Does it work without eventlet installed? python -c "import socket ; socket.getprotobyname('tcp')"

@temoto
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temoto commented Jan 2, 2017

If not, it's a platform configuration error, see https://stackoverflow.com/questions/40184788/protocol-not-found-socket-getprotobyname

TL;DR: you should have /etc/protocols contain line tcp 6 TCP.

@minglethepringle
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@temoto Thanks, the command on that link worked!

@mikeclarke mikeclarke mentioned this issue Aug 6, 2019
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@l3r1nmax l3r1nmax mentioned this issue Sep 18, 2019
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srstsavage added a commit to srstsavage/micromamba-docker that referenced this issue Sep 12, 2023
@srstsavage
Install netbase package in Debian based builds
c57bc8b 
netbase is a tiny (~30kB installed) package providing some core TCP/IP
files. It's somehow not included in debian:bookworm-slim which
can lead to some unexpected errors when trying to use micromamba-docker
based images (example: eventlet crashes with `socket.error: protocol not found`
if netbase is not installed.

eventlet/eventlet#370
@srstsavage srstsavage mentioned this issue Sep 12, 2023
Closed
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@temoto @minglethepringle