Added example of reading JSON from a file, parsing it into a struct, and printing out some parts

Author: Doug-AWS

rust/dynamodb/Cargo.lock

@@ -0,0 +1,12 @@
+[package]
+name = "cross-service-code-examples"
+version = "0.1.0"
+authors = ["Doug Schwartz <dougsch@amazon.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1"
+structopt = { version = "0.3", default-features = false }

rust/dynamodb/Cargo.toml

@@ -0,0 +1,37 @@
+{
+    "Records": [
+        {
+            "eventID": "7de3041dd709b024af6f29e4fa13d34c",
+            "eventName": "INSERT",
+            "eventVersion": "1.1",
+            "eventSource": "aws:dynamodb",
+            "awsRegion": "region",
+            "dynamodb": {
+                "ApproximateCreationDateTime": 1479499740,
+                "Keys": {
+                    "Timestamp": {
+                        "S": "2016-11-18:12:09:36"
+                    },
+                    "Username": {
+                        "S": "John Doe"
+                    }
+                },
+                "NewImage": {
+                    "Timestamp": {
+                        "S": "2016-11-18:12:09:36"
+                    },
+                    "Message": {
+                        "S": "This is a bark from the Woofer social network"
+                    },
+                    "Username": {
+                        "S": "John Doe"
+                    }
+                },
+                "SequenceNumber": "13021600000000001596893679",
+                "SizeBytes": 112,
+                "StreamViewType": "NEW_IMAGE"
+            },
+            "eventSourceARN": "arn:aws:dynamodb:region:123456789012:table/BarkTable/stream/2016-11-16T20:42:48.104"
+        }
+    ]
+}

rust/dynamodb/event1.json

@@ -0,0 +1,37 @@
+{
+    "Records": [
+        {
+            "eventID": "7de3041dd709b024af6f29e4fa13d34c",
+            "eventName": "INSERT",
+            "eventVersion": "1.1",
+            "eventSource": "aws:dynamodb",
+            "awsRegion": "us-west-2",
+            "dynamodb": {
+                "ApproximateCreationDateTime": 1479499740,
+                "Keys": {
+                    "Timestamp": {
+                        "S": "2021-2-18:12:09:36"
+                    },
+                    "Username": {
+                        "S": "John Dough"
+                    }
+                },
+                "NewImage": {
+                    "Timestamp": {
+                        "S": "2021-2-18:12:09:36"
+                    },
+                    "Message": {
+                        "S": "This is a message, doh!"
+                    },
+                    "Username": {
+                        "S": "John Dough"
+                    }
+                },
+                "SequenceNumber": "13021600000000001596893679",
+                "SizeBytes": 112,
+                "StreamViewType": "NEW_IMAGE"
+            },
+            "eventSourceARN": "arn:aws:dynamodb:region:123456789012:table/BarkTable/stream/2016-11-16T20:42:48.104"
+        }
+    ]
+}