Merge pull request #1 from gargnipungarg/http-endpoint-python

Invoking HTTP endpoint via functions.

Author: gargnipungarg

Diff for: samples/invoke-http-endpoint-python/Readme.md

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+# Build using fn cli
+```bash
+fn -v deploy --app <app-name>
+```
+
+# oci-cli based function invocation
+```bash
+oci fn function invoke --function-id <function-ocid> --file "-" --body '{"ENDPOINT":"<predict-url>", "PAYLOAD": "<json-payload>"}'
+```
+
+## Sample:
+```bash
+oci fn function invoke --function-id <function-ocid> --file "-" --body '{"ENDPOINT":"https://modeldeployment.us-ashburn-1.oci.customer-oci.com/<md-ocid>/predict", "PAYLOAD": "{\"index\": \"1\"}"}'
+```
+
+# fn cli based invocation
+```bash
+fn invoke <app-name> <function-name>
+```
+
+## Sample:
+```bash
+echo -n '{"ENDPOINT":"https://modeldeployment.us-ashburn-1.oci.customer-oci.com/<md-ocid>/predict", "PAYLOAD": "{\"index\": \"1\"}"}' | fn invoke <app-name> <function-name>
+```
+
+# More information
+The sample code in [func.py](./func.py) also shows how to get headers and request body. Required headers can also be passed to downstream call, if needed.
+Other ways of function invocation can be found [here](https://docs.oracle.com/en-us/iaas/Content/Functions/Tasks/functionsinvokingfunctions.htm)

Diff for: samples/invoke-http-endpoint-python/func.py

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+import io
+import json
+import logging
+import oci
+import requests
+from fdk import response
+
+
+def handler(ctx, data: io.BytesIO = None):
+    auth = oci.auth.signers.get_resource_principals_signer()
+    logger = logging.getLogger()
+    try:
+        logger.info("Inside function")
+        body = json.loads(data.getvalue())
+        logger.info("Body : " + json.dumps(body))
+        headers = ctx.Headers()
+        logger.info("Headers: " + json.dumps(headers))
+        endpoint = body.get("ENDPOINT")
+        payload = body.get("PAYLOAD")
+        resp = requests.post(endpoint, json=json.loads(payload), auth=auth)
+        logger.info("response : " + resp.json())
+    except (Exception, ValueError) as ex:
+        logger.error("Failed to call endpoint with ex : {}".format(str(ex)))
+    return response.Response(
+            ctx, response_data=resp.json(),
+            headers={"Content-Type": "application/json"}
+        )

Diff for: samples/invoke-http-endpoint-python/func.yaml

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+schema_version: 20180708
+name: api-gw
+version: 1.0.26
+runtime: python
+build_image: fnproject/python:3.9-dev
+run_image: fnproject/python:3.9
+entrypoint: /python/bin/fdk /function/func.py handler
+memory: 256
+timeout: 40

Diff for: samples/invoke-http-endpoint-python/requirements.txt

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+fdk>=0.1.60
+oci>=2.2.18
+requests