Python sample does not work as documented

[DazWilkin]

I followed the instructions (honest):

virtualenv venv
source venv/bin/activate
pip install metaparticle_pkg

pip freeze | grep metaparticle
metaparticle-pkg==0.6.3

I tried the Python sample as-is:

from metaparticle import containerize

This returns:

Traceback (most recent call last):
  File "web.py", line 5, in <module>
    from metaparticle import containerize
ImportError: No module named metaparticle

I then tried:

from metaparticle_pkg import containerize

This returns:

Traceback (most recent call last):
  File "web.py", line 27, in <module>
    'name': 'test',
TypeError: 'module' object is not callable

I briefly explored the package but it's not immediately obvious to me what needs to be done :-(

[tomkukral]

Yes, you need to change at least packager_repo and package_name in examples/simple/example.py.

Should we document it?

[DazWilkin]

Thank you.

You solved my problem but that wasn't my question :-)

I was referring to this documentation which contradicts the examples/simple/example.py

https://metaparticle.io/tutorials/python/

from metaparticle import containerize
...
@containerize(
    'docker.io/your-docker-user-goes-here',
    options={
        'ports': [8080],
        'name': 'my-image',
        'publish': True
    })
def main():
    Handler = MyHandler
    httpd = SocketServer.TCPServer(("", port), Handler)
    httpd.serve_forever()

So the documentation needs to be corrected to reflect the correct module name etc.

[DazWilkin]

OK... Making progress...

Mashed-up the sample from the metaparticle.io Python page with this sample:

from metaparticle_pkg import Containerize
from six.moves import SimpleHTTPServer, socketserver

import socket

repo = 'docker.io/[[MY-DOCKER]]'
name = 'mp-python'

OK = 200
port = 8080

class MyHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
    def do_GET(self):
        self.send_response(OK)
        self.send_header("Content-type", "text/plain")
        self.end_headers()
        self.wfile.write("Hello Metaparticle [{}] @ {}\n".format(
          self.path,
          socket.gethostname()).encode('UTF-8')
        )
        print("request for {}".format(self.path))
    def do_HEAD(self):
        self.send_response(OK)
        self.send_header("Content-type", "text/plain")
        self.end_headers()

@Containerize(
    package={
        'name': name,
        'repository': repo,
        'publish': True,
    },
    runtime={
        'ports': [
            port
        ],
    }
)
def main():
    Handler = MyHandler
    httpd = socketserver.TCPServer(("", port), Handler)
    httpd.serve_forever()

if __name__ == '__main__':
    print("Starting...")
    main()

Runs under Docker locally:

curl http://localhost:8080/test
Hello Henry [/test] @ 8b31882c087c

I reviewed the code to work out -- I think !? -- the config for Kubernetes:

        'replicas': 4,
        'executor': 'metaparticle',

and this yields

Starting...
==> Detected container mp-python-c5b8b68d7-6kfvr:mp-python-0
==> Detected container mp-python-c5b8b68d7-t7ldn:mp-python-0
==> Detected container mp-python-c5b8b68d7-tqz82:mp-python-0
==> Detected container mp-python-c5b8b68d7-xvpph:mp-python-0

and:

kubectl get pods
NAME                        READY     STATUS    RESTARTS   AGE
mp-python-c5b8b68d7-gxj65   1/1       Running   0          11s
mp-python-c5b8b68d7-p5lbd   1/1       Running   0          11s
mp-python-c5b8b68d7-stvqh   1/1       Running   0          11s
mp-python-c5b8b68d7-wkwpz   1/1       Running   0          11s

kubectl get services
NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
kubernetes   ClusterIP   10.63.240.1     <none>        443/TCP    1h
mp-python    ClusterIP   10.63.240.159   <none>        8080/TCP   16s

The service is a ClusterIP and would be better (can I configure?) as a LoadBalancer, so:

kubectl run curl --image=radial/busyboxplus:curl -i --tty --rm
If you don't see a command prompt, try pressing enter.
[ root@curl-6896d87888-hqr6b:/ ]$ curl mp-python:8080/test
Hello Henry [/test] @ mp-python-c5b8b68d7-wkwpz

[brendandburns]

you need to set 'public': True in your runtime config to get an external IP address...

(at least that should work in Python, if it doesn't file another bug...)

[brendandburns]

oops, didn't mean to close this...

[brendandburns]

I was wrong, I think it was meant to be 'publicAddress': True

But as I mentioned in the bug, I should probably switch that to public

[DazWilkin]

Apologies for my delay in replying.

That did not work. 'publicAddress': True is accepted but I continue to receive a Cluster IP:

kubectl get services
NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
kubernetes   ClusterIP   10.43.240.1     <none>        443/TCP    49m
mp-python    ClusterIP   10.43.255.186   <none>        8080/TCP   2m

I did not upgrade my code.

[brendandburns]

I'll try to repro this tonight...

---

From: Daz Wilkin notifications@github.com Sent: Thursday, February 22, 2018 2:39 PM To: metaparticle-io/package Cc: Brendan Burns; State change Subject: Re: [metaparticle-io/package] Python sample does not work as documented (#82)

Apologies for my delay in replying.

That did not work. 'publicAddress': True is accepted but I continue to receive a Cluster IP:

kubectl get services NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.43.240.1 443/TCP 49m mp-python ClusterIP 10.43.255.186 8080/TCP 2m

I did not upgrade my code.

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[DazWilkin]

This is mostly my personal curiosity and no customer is being harmed by this not working as intended. Very much value your help @brendanburns and I'm inspired by metaparticle but, unless others are pestering, please don't prioritize this.

I'm headed out on vacation tomorrow and will be non-responsive for a week.

I did not update metaparticle nor refresh the repo.

I added the property as you suggested.

The code is as-above and:

@Containerize(
    package={
        'name': name,
        'repository': repo,
        'publish': True,
    },
    runtime={
        'ports': [
            port
        ],
        'replicas': 4,
        'executor': 'metaparticle',
        'publicAddress': True,
    }
)

pip freeze
backports.ssl-match-hostname==3.5.0.1
certifi==2018.1.18
chardet==3.0.4
docker==2.7.0
docker-pycreds==0.2.1
idna==2.6
ipaddress==1.0.19
metaparticle-pkg==0.6.3
requests==2.18.4
six==1.10.0
urllib3==1.22
websocket-client==0.46.0

What else can I provide that would help you repo?

Does mp-compiler report its version?

[brendandburns]

Ok, I fixed this in #98

The syntax is now:

runtime={'ports': [8080], 'executor': 'metaparticle', 'replicas': 3, 'public': True}

And you need to update to metaparticle_pkg version 0.6.6