Try hello world with zappa.
https://github.com/Miserlou/Zappa
It seems to be a flask-based framework that realizes serverless python web service with aws. It seems to make full use of api gateway + lamdba + cloudwatch events.
The demo gif image is exciting.
http://flask.pocoo.org/
It is a microframework for python web application with wsgi + jinja2 as the back end. The first commit has a long history of 2010. As you can see on the official top page, you can do hello world with http with the following code.
from flask import Flask
app = Flask(__name__)
@app.route("/")
def hello():
return "Hello World!\n"
if __name__ == "__main__":
app.run()
$ pip install Flask
$ python hello.py &
* Running on http://localhost:5000/
$ curl http://localhost:5000
Hello World!
This time I will try to run it with centos7 on vagrant.
Since virtualenv is required for zappa, let's start from that area.
In addition, we will proceed as a vagrant user.
Install with yum normally.
sudo yum install -y gcc libffi-devel python-devel openssl-devel zlib-devel bzip2 bzip2-devel readline-devel sqlite sqlite-devel openssl-devel git
Install pip system-wide.
curl -L https://bootstrap.pypa.io/get-pip.py | sudo python
pyenv + virtualenv
Install pyenv and virtualenv. I'm grateful to have a great script that can install both at once.
curl -L https://raw.githubusercontent.com/yyuu/pyenv-installer/master/bin/pyenv-installer | bash
cat << 'EOF' >> ~/.bash_profile
### virtualenv
export PATH="/home/vagrant/.pyenv/bin:$PATH"
eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"
EOF
The following sites were easy to understand about pyenv and virtualenv. http://blog.ieknir.com/blog/pyenv-with-virtualenv/
virtualenvwrapper
It seems to be convenient, so I will introduce it with reference to the following qiita. http://qiita.com/drafts/505492193317819772c7/edit
sudo pip install virtualenvwrapper
export WORKON_HOME="~/python-venv"
mkdir -p $WORKON_HOME
virtualenvwrapper_sh=$(whereis virtualenvwrapper.sh | cut -d : -f2)
echo """
if [ -f ${virtualenvwrapper_sh} ]; then
export WORKON_HOME=$HOME/.virtualenvs
source ${virtualenvwrapper_sh}
fi
""" >> ~/.bash_profile
source ${virtualenvwrapper_sh}
So far I've put it on github.
### install python
pyenv install 2.7.12
pyenv local 2.7.12
It is 2.7.12.
$ pyenv versions
system
* 2.7.12 (set by PYENV_VERSION environment variable)
mkvirtualenv
Let's create a dedicated environment with mkvirtualenv. The prompt changes and it's fashionable.
vagrant 07:42:55 ~$ mkvirtualenv zappa_2.7.12
(zappa_2.7.12) vagrant 07:42:55 ~$
I will set it up.
$ mkdir app
$ cd app
$ cat << EOF >> requirements.txt
zappa
flask
EOF
$ pip install -r requirements.txt
$ zappa init
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███████╗██║ ██║██║ ██║ ██║ ██║
╚══════╝╚═╝ ╚═╝╚═╝ ╚═╝ ╚═╝ ╚═╝
Welcome to Zappa!
Zappa is a system for running server-less Python web applications on AWS Lambda and AWS API Gateway.
This `init` command will help you create and configure your new Zappa deployment.
Let's get started!
Your Zappa configuration can support multiple production environments, like 'dev', 'staging', and 'production'.
What do you want to call this environment (default 'dev'):
Something came out. You are asked for the environment name, but leave it as dev.
Your Zappa deployments will need to be uploaded to a private S3 bucket.
If you don't have a bucket yet, we'll create one for you too.
What do you want call your bucket? (default 'zappa-*****'):
You'll be asked for an S3 bucket name to deploy to lambda, but leave this as the default.
It looks like this is a Flask application.
What's the modular path to your app's function?
This will likely be something like 'your_module.app'.
Where is your app's function?:
Let's call it test.app.
Okay, here's your zappa_settings.js:
{
"dev": {
"app_function": "test.app",
"s3_bucket": "zappa-******"
}
}
Does this look okay? (default y) [y/n]: y
Done! Now you can deploy your Zappa application by executing:
$ zappa deploy dev
After that, you can update your application code with:
$ zappa update dev
To learn more, check out the Zappa project page on GitHub: https://github.com/Miserlou/Zappa
or stop by our Slack channel: http://bit.do/zappa
Enjoy!
Initialization is complete.
zappa_settings.json
By default the region was us-east-1, so edit it. Also, if the profile is separated by credentials, specify it by profile_name.
$ cat zappa_settings.json
{
"dev": {
"app_function": "test.app",
"s3_bucket": "zappa-*****",
"aws_region": "ap-northeast-1",
"profile_name": "profile_name" //If necessary
}
}
I would like to run the sample here.
$ cat test.py
import logging
from flask import Flask
app = Flask(__name__)
logging.basicConfig()
logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)
@app.route('/', methods=['GET', 'POST'])
def hello(event=None, context=None):
logger.info('Lambda function invoked index()')
return 'hello from Flask!\n'
if __name__ == '__main__':
app.run(debug=True)
The folder structure looks like this.
~/app$ tree
.
├── requirements.txt
├── test.py
└── zappa_settings.json
0 directories, 3 files
Since you are accessing aws, set the credential in the following way.
~ / .aws / configdeploy ！
It's finally deploy.
(zappa_2.7.12-2) vagrant 08:05:26 ~/app$ zappa deploy dev
Packaging project as zip...
Uploading zip (2.7MiB)...
100%|█████████████████████████████████████████████████████████████████████████████████████████| 2.81M/2.81M [00:00<00:00, 2.97Mit/s]
Scheduling keep-warm..
Creating API Gateway routes (this only happens once)..
1008it [01:39, 10.17it/s]
Deploying API Gateway..
Deployed! https://*****.execute-api.ap-northeast-1.amazonaws.com/dev
I'll hit it.
(zappa_2.7.12-2) vagrant 08:07:45 ~/app$ curl -l https://*****.execute-api.ap-northeast-1.amazonaws.com/dev
hello from Flask!
It was!
It is convenient to check cloudwatch logs with zappa tail dev.
(I'm getting an error.)
[1470384650490] [DEBUG] 2016-08-05T08:10:50.490Z 1f3ccb88-5ae4-11e6-b4c6-c9ecf09594ff Zappa Event: {u'body': u'e30=', u'headers': {u'Via': u'1.1 9736f79fa942ea72a1eee114f49093dd.cloudfront.net (CloudFront)', u'CloudFront-Is-Desktop-Viewer': u'true', u'CloudFront-Is-SmartTV-Viewer': u'false', u'CloudFront-Forwarded-Proto': u'https', u'X-Forwarded-For': u'1.1.1.1, 2.2.2.2', u'CloudFront-Viewer-Country': u'JP', u'Accept': u'*/*', u'User-Agent': u'curl/7.43.0', u'Host': u'q14421ik6h.execute-api.ap-northeast-1.amazonaws.com', u'X-Forwarded-Proto': u'https', u'X-Amz-Cf-Id': u'RdcP863CiLrem7LekuwSQrt2YvNw29a9m3Es55O2Db6E9YGjqWQdCg==', u'CloudFront-Is-Tablet-Viewer': u'false', u'X-Forwarded-Port': u'443', u'CloudFront-Is-Mobile-Viewer': u'false'}, u'params': {}, u'method': u'GET', u'query': {}}
[1470384650491] [INFO] 2016-08-05T08:10:50.491Z 1f3ccb88-5ae4-11e6-b4c6-c9ecf09594ff Lambda function invoked index()
[1470384650491] [INFO] 2016-08-05T08:10:50.491Z 1f3ccb88-5ae4-11e6-b4c6-c9ecf09594ff 1.1.1.1 - - [05/Aug/2016:08:10:50 +0000] "GET / HTTP/1.1" 200 18 "" "curl/7.43.0" 0/0.798
[1470384659083] need more than 1 value to unpack: ValueError
Traceback (most recent call last):
File "/var/task/handler.py", line 324, in lambda_handler
return LambdaHandler.lambda_handler(event, context)
File "/var/task/handler.py", line 121, in lambda_handler
return cls().handler(event, context)
File "/var/task/handler.py", line 146, in handler
app_function = self.import_module_and_get_function(whole_function)
File "/var/task/handler.py", line 114, in import_module_and_get_function
module, function = whole_function.rsplit('.', 1)
ValueError: need more than 1 value to unpack
You can update your application with zappa update dev.
You can delete everything deployed with zappa undeploy dev.
$ zappa undeploy dev
Are you sure you want to undeploy? [y/n] y
Deleting API Gateway..
Removing keep-warm..
Deleting Lambda function..
Done!
I was able to build a web application that hello world without knowing what it was. It's amazing.