So far my journey with Outreachy has been incredible! My learning graph has skyrocketed by contributing to the Qinling project with the help of my mentor, Lingxian Kong. I truly appreciate and value everything I am learning from my mentor and this project. It will forever remain a major contributor to my success and achievements.
In this post, you would be able to create a function using the object storage service of OpenStack, Swift. Qinling is growing tremendously it is now integrated with swift, where you can create functions and invoke them with not much effort. I believe it is going to pave new ways of helping user/developer to achieve their tasks. So let’s get started!
OpenStack object storage service, swift can be integrated with Qinling to create functions. You can upload your function package to swift and create the function by specifying the container name and object name in Swift. In this example the function would return “Hello, Neerja!”, you can replace the string with the function input. The steps assume there is already a Python 2.7 runtime available in the deployment.
Step1: Create a function deployment package.
$ mkdir ~/qinling_swift_test
$ cd ~/qinling_swift_test
$ cat <<EOF > hello_world.py
def main(name='World',**kwargs):
ret = 'Hello, %s' % name
return ret
EOF
$ cd ~/qinling_swift_test && zip -r ~/qinling_swift_test/hello_world.zip ./*Step2: Upload the file to swift
1. Create a container named "functions"$ openstack container create functions
+---------------------------------------+------------------+------------------------------------+
| account | container | x-trans-id |
+---------------------------------------+------------------+------------------------------------+
| AUTH_6ae7142bff0542d8a8f3859ffa184236 | functions | 9b45bef5ab2658acb9b72ee32f39dbc8 |
+---------------------------------------+------------------+------------------------------------+2. Add the function deployment package(.zip) to the container$ openstack object create functions hello_world.zip
+-----------------+-----------+----------------------------------+
| object | container | etag |
+-----------------+-----------+----------------------------------+
| hello_world.zip | functions | 9b45bef5ab2658acb9b72ee32f39dbc8 |
+-----------------+-----------+----------------------------------+3. Display the container and its object $ openstack object show functions hello_world.zip
+----------------+---------------------------------------+
| Field | Value |
+----------------+---------------------------------------+
| account | AUTH_6ae7142bff0542d8a8f3859ffa184236 |
| container | functions |
| content-length | 246 |
| content-type | application/zip |
| etag | 9b45bef5ab2658acb9b72ee32f39dbc8 |
| last-modified | Wed, 18 Jul 2018 17:45:23 GMT |
| object | hello_world.zip |
+----------------+---------------------------------------+
Step3: Create a function and get the function ID, replace the runtime_id with the one in your deployment. Also, specify swift container and object name.
$ openstack function create --name hello_world \
--runtime $runtime_id \
--entry hello_world.main \
--container functions \
--object hello_world.zip
+-------------+----------------------------------------------------------------------------------------------+
| Field | Value |
+-------------+----------------------------------------------------------------------------------------------+
| id | f1102bca-fbb4-4baf-874d-ed33bf8251f7 |
| name | hello_world |
| description | None |
| count | 0 |
| code | {u'source': u'swift', u'swift': {u'object': u'hello_world.zip', u'container': u'functions'}} |
| runtime_id | 0d8bcf73-910b-4fec-86b1-38ace8bd0766 |
| entry | hello_world.main |
| project_id | 6ae7142bff0542d8a8f3859ffa184236 |
| created_at | 2018-07-18 17:46:29.974506 |
| updated_at | None |
| cpu | 100 |
| memory_size | 33554432 |
+-------------+----------------------------------------------------------------------------------------------+Step4: Invoke the function by specifying function_id
$ function_id=f1102bca-fbb4-4baf-874d-ed33bf8251f7
$ openstack function execution create $function_id --input Neerja
+------------------+-----------------------------------------------+
| Field | Value |
+------------------+-----------------------------------------------+
| id | 3451393d-60c6-4172-bbdf-c681929fae07 |
| function_id | f1102bca-fbb4-4baf-874d-ed33bf8251f7 |
| function_version | 0 |
| description | None |
| input | None |
| result | {"duration": 0.031,"output": "Hello, Neerja"} |
| status | success |
| sync | True |
| project_id | 6ae7142bff0542d8a8f3859ffa184236 |
| created_at | 2018-07-18 17:49:46 |
| updated_at | 2018-07-18 17:49:48 |
+------------------+-----------------------------------------------+Please try this tutorial it makes the integration of Qinling and Swift very simple for its users!
