openwhisk.md

PyWren on vanilla OpenWhisk

PyWren can also run on vanilla OpenWhisk installations, for example by deploying OpenWhisk with openwhisk-devtools.

Once you have your deployment ready, you need to install the openwhisk-cli and then ensure you can run end-to-end python example.

For example, create a file named hello.py with the next content:

def main(args):
    name = args.get("name", "stranger")
    greeting = "Hello " + name + "!"
    print(greeting)
    return {"greeting": greeting}

Now issue the wsk command to deploy the python action:

$ wsk action create helloPython hello.py

Finally, test the helloPython action:

$ wsk action invoke --result helloPython --param name World

If everything is working fine, you can proceed to configure PyWren. To do so, edit ~/.pywren_config and add the next section::

openwhisk:
    endpoint    : <OW_ENDPOINT>
    namespace   : <NAMESPACE>
    api_key     : <AUTH_KEY>
    insecure    : <True/False>

You can find all the values in ~/.wskprops file. For example, the content of the file should looks like:

APIHOST=192.168.1.30
AUTH=23bc46b1-71f6-4ed5-8c54-816aa4f8c50:123zO3xZCLrMN6v2BKK1dXYFpXlPkccOFqm12CdAsMgRU4VrNZ9lyGVCG
INSECURE_SSL=true
NAMESPACE=guest

Copy all the values into the pywren config file as:

openwhisk:
    endpoint    : https://192.168.1.30
    namespace   : guest
    api_key     : 23bc46b1-71f6-4ed5-8c54-816aa4f8c50:123zO3xZCLrMN6v2BKK1dXYFpXlPkccOFqm12CdAsMgRU4VrNZ9lyGVCG
    insecure    : True

Once configured, you can start running functions:

import pywren_ibm_cloud as pywren

def add_seven(x):
    return x + 7

if __name__ == '__main__':
    wsk = pywren.openwhisk_executor()
    wsk.call_async(add_seven, 3)
    print(wsk.get_result())