feat: introduce echo return for Python http template (#1078)

* Introduce echo return for Python http template

* Updated tests and regenerated zz* file

* Updated output to dict-only

* Changed output type from Python dict literal to proper JSON

templates/python/http/func.py

@@ -1,4 +1,47 @@
 from parliament import Context
+from flask import Request
+import json
+
+
+# parse request body, json data or URL query parameters
+def payload_print(req: Request) -> str:
+    if req.method == "POST":
+        if req.is_json:
+            return json.dumps(req.json) + "\n"
+        else:
+            # MultiDict needs some iteration
+            ret = "{"
+
+            for key in req.form.keys():
+                ret += '"' + key + '": "'+ req.form[key] + '", '
+
+            return ret[:-2] + "}\n" if len(ret) > 2 else "{}"
+
+    elif req.method == "GET":
+        # MultiDict needs some iteration
+        ret = "{"
+
+        for key in req.args.keys():
+            ret += '"' + key + '": "' + req.args[key] + '", '
+
+        return ret[:-2] + "}\n" if len(ret) > 2 else "{}"
+
+
+# pretty print the request to stdout instantaneously
+def pretty_print(req: Request) -> str:
+    ret = str(req.method) + ' ' + str(req.url) + ' ' + str(req.host) + '\n'
+    for (header, values) in req.headers:
+        ret += "  " + str(header) + ": " + values + '\n'
+
+    if req.method == "POST":
+        ret += "Request body:\n"
+        ret += "  " + payload_print(req) + '\n'
+
+    elif req.method == "GET":
+        ret += "URL Query String:\n"
+        ret += "  " + payload_print(req) + '\n'
+
+    return ret
 
  
 def main(context: Context):
@@ -9,5 +52,12 @@ def main(context: Context):
     """
 
     # Add your business logic here
+    print("Received request")
 
-    return { "message": "Howdy!" }, 200
+    if 'request' in context.keys():
+        ret = pretty_print(context.request)
+        print(ret, flush=True)
+        return payload_print(context.request), 200
+    else:
+        print("Empty request", flush=True)
+        return "{}", 200

templates/python/http/test_func.py

@@ -4,9 +4,9 @@ func = __import__("func")
 
 class TestFunc(unittest.TestCase):
 
-  def test_func(self):
+  def test_func_empty_request(self):
     resp, code = func.main({})
-    self.assertEqual(resp["message"], "Howdy!")
+    self.assertEqual(resp, "{}")
     self.assertEqual(code, 200)
 
 if __name__ == "__main__":

test/_e2e/trigger_http_test.go

@@ -78,8 +78,8 @@ var defaultFunctionsHttpValidators = []FunctionHttpResponsivenessValidator{
 		expects:   `OK`,
 	},
 	{runtime: "python",
-		targetUrl: "%s",
-		expects:   `Howdy!`,
+		targetUrl: "%s?message=hello",
+		expects:   `{"message": "hello"}`,
 	},
 	{runtime: "quarkus",
 		targetUrl: "%s?message=hello",