Added S3 docs

Signed-off-by: Nicholas Cilfone <nicholas.cilfone@fmr.com>

README.md

@@ -39,18 +39,16 @@ recent features, bugfixes, and hotfixes.
 
 See [Releases](https://github.com/fidelity/spock/releases) for more information.
 
-#### March  18th, 2021
+#### May 6th, 2021
+* Added S3 support with `pip install spock-config[s3]`
+* S3 addon supports automatically handling loading/saving from paths defined with `s3://` URI(s) by passing in an
+active `boto3.Session`
+
+#### March 18th, 2021
 
 * Support for Google docstring style annotation of `spock` class (and Enums) and attributes
 * Added in ability to print docstring annotated help information to command line with `--help` argument
 
-#### March 1st, 2021
-
-* Removed legacy backend and API (dataclasses and custom typed interface)
-* Updated markdown save call to support advanced types so that saved configurations are now valid `spock` config 
-  input files
-* Changed tuples to support length restrictions
-
 ## Documentation
 
 Current documentation and more information can be found [here](https://fidelity.github.io/spock/).
@@ -72,6 +70,8 @@ set of parameters.
 * Tractability and Reproducibility: Save runtime parameter configuration to YAML, TOML, or JSON with a single chained 
   command (with extra runtime info such as Git info, Python version, machine FQDN, etc). The saved markdown file can be
   used as the configuration input to reproduce prior runtime configurations.
+* S3 Addon: Automatically detects `s3://` URI(s) and handles loading and saving `spock` configuration files when an
+  active `boto3.Session` is passed in (plus any additional `S3Transfer` configurations)
 
 #### Main Contributors
 

docs/addons/S3.md

@@ -0,0 +1,130 @@
+# S3 Support
+
+When installed with the S3 addon `spock` will attempt to identify S3 URI(s) (e.g. `s3://<bucket-name>/<key>`) and handle 
+them automatically. The user only needs to provide an active `boto3.session.Session` to an `S3Config` object and pass
+it to the `ConfigArgBuilder`.
+
+
+### Installing
+
+Install `spock` with the extra s3 related dependencies.
+
+```bash
+pip install spock-config[s3]
+```
+
+### Creating a boto3 Session
+
+The user must provide an active `boto3.session.Session` object to `spock` in order for the library to automatically
+handle S3 URI(s). Configuration is **highly dependent** upon your current AWS setup/security. Please refer to the 
+`boto3` docs for [session](https://boto3.amazonaws.com/v1/documentation/api/latest/reference/core/session.html) and
+[credentials](https://boto3.amazonaws.com/v1/documentation/api/latest/guide/credentials.html) for help on how to 
+correctly configure your `boto3.session.Session`.
+
+For instance, let's just suppose we are going to get our tokens via SAML authorization 
+where we already have the SAMLAssertion, RoleArn, and PrincipalArn stored as env variables:
+
+```python
+import boto3
+import os
+
+client = boto3.client('sts')
+
+token = client.assume_role_with_saml(
+    RoleArn=os.environ.get("RoleArn"), PrincipalArn=os.environ.get("PrincipalArn"),
+    SAMLAssertion=os.environ.get("SamlString")
+)
+
+credentials = token['Credentials']
+
+session = boto3.Session(
+            aws_access_key_id=credentials['AccessKeyId'],
+            aws_secret_access_key=credentials['SecretAccessKey'],
+            aws_session_token=credentials['SessionToken'],
+            region_name=os.environ.get('AWS_REGION'))
+```
+
+### Using the S3Config Object
+
+As an example let's create a basic `@spock` decorated class, instantiate a `S3Config` object from `spock.addons` with
+the `boto3.session.Session` we created above, and pass it to the `ConfigArgBuilder`.
+
+```python
+from spock.addons import S3Config
+from spock.builder import ConfigArgBuilder
+from spock.config import spock
+from typing import List
+
+@spock
+class BasicConfig:
+    """Basic spock configuration for example purposes
+
+    Attributes:
+        parameter: simple boolean that flags rounding
+        fancy_parameter: parameter that multiplies a value
+        fancier_parameter: parameter that gets added to product of val and fancy_parameter
+        most_fancy_parameter: values to apply basic algebra to
+
+    """
+    parameter: bool
+    fancy_parameter: float
+    fancier_parameter: float
+    most_fancy_parameter: List[int]
+
+def main():
+    # Create an S3Config object and pass in the boto3 session
+    s3_config = S3Config(
+        session=session
+    )
+    # Chain the generate function to the ConfigArgBuilder call
+    # Pass in the S3Config object
+    config = ConfigArgBuilder(
+        BasicConfig, 
+        desc='S3 example',
+        s3_config=s3_config
+    ).generate()
+```
+
+### Defining the configuration file with a S3 URI
+
+Usually we pass a relative or absolute system path as the configuration file command line argument. Here we pass 
+in a S3 URI instead:
+
+```bash
+$ python simple.py -c s3://my-bucket/path/to/file/config.yaml
+```
+
+With a `S3Config` object passed into the `ConfigArgBuilder` the S3 URI will automatically be handled by `spock`.
+
+### Saving to a S3 URI
+
+Similarly, we usually pass a relative or absolute system path to the `SavePath` special argument type or 
+to the `user_specified_path` kwarg. Again, instead we give a S3 URI:
+
+```python
+def main():
+    # Create an S3Config object and pass in the boto3 session
+    s3_config = S3Config(
+        session=session
+    )
+    # Chain the generate function to the ConfigArgBuilder call
+    # Pass in the S3Config object
+    config = ConfigArgBuilder(
+        BasicConfig, 
+        desc='S3 example',
+        s3_config=s3_config
+    ).save(user_specified_path="s3://my-bucket/path/to/file/").generate()
+```
+
+With a `S3Config` object passed into the `ConfigArgBuilder` the S3 URI will automatically be handled by `spock`.
+
+### S3Transfer ExtraArgs
+
+If you require any other settings for uploading or downloading files from S3 the `S3Config` class has two extra 
+attributes:
+
+`download_config` which takes a `S3DownloadConfig` object from `spock.addons` which supports all ExtraArgs from
+[S3Transfer.ALLOWED_DOWNLOAD_ARGS](https://boto3.amazonaws.com/v1/documentation/api/latest/reference/customizations/s3.html#boto3.s3.transfer.S3Transfer.ALLOWED_DOWNLOAD_ARGS)
+
+`upload_config` which takes a `S3UploadConfig` object from `spock.addons` which supports all ExtraArgs from
+[S3Transfer.ALLOWED_UPLOAD_ARGS](https://boto3.amazonaws.com/v1/documentation/api/latest/reference/customizations/s3.html#boto3.s3.transfer.S3Transfer.ALLOWED_UPLOAD_ARGS)

pyproject.toml

@@ -60,5 +60,10 @@ Motivation = "docs/Motivation.md"
     [[tool.portray.mkdocs.nav."Advanced Features"]]
     "Command Line Overrides" = "docs/advanced_features/Command-Line-Overrides.md"
 
+# Addons
+[[tool.portray.mkdocs.nav]]
+    [[tool.portray.mkdocs.nav."Addons"]]
+    "S3" = "docs/addons/S3.md"
+
 [[tool.portray.mkdocs.nav]]
 Contributing = "CONTRIBUTING.md"