Add an example of AWS StepFunctions in Python (#97)

aws-py-stepfunctions/Pulumi.yaml

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+name: stepfunctions-py
+description: Basic example of AWS Step Functions in Python.
+runtime: python

aws-py-stepfunctions/README.md

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+# AWS Step Functions (Python)
+
+A basic example that demonstrates using AWS Step Functions with a Lambda function, written in Python.
+
+```
+# Install dependencies
+$ pip install -r ./requirements.txt
+
+# Create and configure a new stack
+$ pulumi stack init stepfunctions-dev
+$ pulumi config set aws:region us-east-2
+
+# Preview and run the deployment
+$ pulumi update
+
+# Start execution using the AWS CLI (or from the console at https://console.aws.amazon.com/states)
+$ aws stepfunctions start-execution --state-machine-arn $(pulumi stack output state_machine_arn)
+
+# Remove the app and its stack
+$ pulumi destroy && pulumi stack rm -y
+```

aws-py-stepfunctions/__main__.py

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+# Copyright 2016-2018, Pulumi Corporation.  All rights reserved.
+
+import iam
+import pulumi
+from pulumi_aws import lambda_, sfn
+
+hello_world_fn = lambda_.Function('helloWorldFunction',
+    role=iam.lambda_role.arn,
+    runtime="python2.7",
+    handler="hello_step.hello",
+    code=pulumi.AssetArchive({
+        '.': pulumi.FileArchive('./step_hello')
+    })
+)
+
+state_defn = state_machine = sfn.StateMachine('stateMachine',
+    role_arn=iam.sfn_role.arn,
+    definition="""{
+        "Comment": "A Hello World example of the Amazon States Language using an AWS Lambda Function",
+        "StartAt": "HelloWorld",
+        "States": {
+            "HelloWorld": {
+                "Type": "Task",
+                "Resource": "%s",
+                "End": true
+            }
+        }
+    }""" % hello_world_fn.arn
+)
+
+pulumi.output('state_machine_arn', state_machine.id)

aws-py-stepfunctions/iam.py

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+# Copyright 2016-2018, Pulumi Corporation.  All rights reserved.
+
+from pulumi_aws import config, iam
+
+lambda_role = iam.Role('lambdaRole',
+    assume_role_policy="""{
+        "Version": "2012-10-17",
+        "Statement": [
+            {
+                "Action": "sts:AssumeRole",
+                "Principal": {
+                    "Service": "lambda.amazonaws.com"
+                },
+                "Effect": "Allow",
+                "Sid": ""
+            }
+        ]
+    }"""
+)
+
+lambda_role_policy = iam.RolePolicy('lambdaRolePolicy',
+    role=lambda_role.id,
+    policy="""{
+        "Version": "2012-10-17",
+        "Statement": [{
+            "Effect": "Allow",
+            "Action": [
+                "logs:CreateLogGroup",
+                "logs:CreateLogStream",
+                "logs:PutLogEvents"
+            ],
+            "Resource": "arn:aws:logs:*:*:*"
+        }]
+    }"""
+)
+
+sfn_role = iam.Role('sfnRole',
+    assume_role_policy="""{
+        "Version": "2012-10-17",
+        "Statement": [
+            {
+                "Effect": "Allow",
+                "Principal": {
+                    "Service": "states.%s.amazonaws.com"
+                },
+                "Action": "sts:AssumeRole"
+            }
+        ]
+    }""" % config.region
+)
+
+sfn_role_policy = iam.RolePolicy('sfnRolePolicy',
+    role=sfn_role.id,
+    policy="""{
+        "Version": "2012-10-17",
+        "Statement": [
+            {
+                "Effect": "Allow",
+                "Action": [
+                    "lambda:InvokeFunction"
+                ],
+                "Resource": "*"
+            }
+        ]
+    }"""
+)

aws-py-stepfunctions/requirements.txt

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+pulumi>=0.14.0
+pulumi-aws>=0.14.3

aws-py-stepfunctions/step_hello/hello.py

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+def handler(event, context):
+    return "Hello world!"