Uploaded lesson 1 exercises (code+solution)

Author: Udacavs

course-04/exercises/lesson-1/solution/iam-policy.json

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+{
+    "Version": "2012-10-17",
+    "Statement": [
+        {
+            "Effect": "Allow",
+            "Action": "logs:CreateLogGroup",
+            "Resource": "arn:aws:logs:us-east-1:*:*"
+        },
+        {
+            "Effect": "Allow",
+            "Action": [
+                "logs:CreateLogStream",
+                "logs:PutLogEvents"
+            ],
+            "Resource": [
+                "arn:aws:logs:us-east-1:*:log-group:/aws/lambda/chaos-monkey:*"
+            ]
+        },
+        {
+            "Effect": "Allow",
+            "Action": "cloudwatch:PutMetricData",
+            "Resource": "*"
+        }
+    ]
+}

course-04/exercises/lesson-1/solution/index.js

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+const AWS = require('aws-sdk')
+const axios = require('axios')
+
+// Name of a service, any string
+const serviceName = process.env.SERVICE_NAME
+// URL of a service to test
+const url = process.env.URL
+
+// CloudWatch client
+const cloudwatch = new AWS.CloudWatch();
+
+exports.handler = async (event) => {
+  let endTime
+  let requestWasSuccessful
+
+  const startTime = timeInMs()
+  try {
+    await axios.get(url)
+    requestWasSuccessful = true
+  } catch (e) {
+    requestWasSuccessful = false
+  } finally {
+    endTime = timeInMs()
+  }
+
+  const totalTime = endTime - startTime
+
+  await cloudwatch.putMetricData({
+    MetricData: [
+      {
+        MetricName: 'Success',
+        Dimensions: [
+          {
+            Name: 'ServiceName',
+            Value: serviceName
+          }
+        ],
+        Unit: 'Count',
+        Value: requestWasSuccessful ? 1 : 0
+      }
+    ],
+    Namespace: 'Udacity/Serveless'
+  }).promise()
+
+  await cloudwatch.putMetricData({
+    MetricData: [
+      {
+        MetricName: 'Latency',
+        Dimensions: [
+          {
+            Name: 'ServiceName',
+            Value: serviceName
+          }
+        ],
+        Unit: 'Milliseconds',
+        Value: totalTime
+      }
+    ],
+    Namespace: 'Udacity/Serveless'
+  }).promise()
+}
+
+function timeInMs() {
+  return new Date().getTime()
+}

course-04/exercises/lesson-1/solution/package-lock.json

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+{
+    "name": "serverless-http-metrics",
+    "version": "1.0.0",
+    "description": "",
+    "main": "index.js",
+    "scripts": {
+        "package": "zip -r http-metrics.zip .",
+        "test": "echo \"Error: no test specified\" && exit 1"
+    },
+    "author": "",
+    "license": "ISC",
+    "dependencies": {
+        "axios": "^0.18.0"
+    },
+    "devDependencies": {
+        "aws-sdk": "^2.432.0"
+    }
+}

course-04/exercises/lesson-1/solution/package.json

@@ -0,0 +1,25 @@
+{
+    "Version": "2012-10-17",
+    "Statement": [
+        {
+            "Effect": "Allow",
+            "Action": "logs:CreateLogGroup",
+            "Resource": "arn:aws:logs:us-east-1:*:*"
+        },
+        {
+            "Effect": "Allow",
+            "Action": [
+                "logs:CreateLogStream",
+                "logs:PutLogEvents"
+            ],
+            "Resource": [
+                "arn:aws:logs:us-east-1:*:log-group:/aws/lambda/chaos-monkey:*"
+            ]
+        },
+        {
+            "Effect": "Allow",
+            "Action": "cloudwatch:PutMetricData",
+            "Resource": "*"
+        }
+    ]
+}

course-04/exercises/lesson-1/starter-code/iam-policy.json

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+const AWS = require('aws-sdk')
+const axios = require('axios')
+
+// Name of a service, any string
+const serviceName = process.env.SERVICE_NAME
+// URL of a service to test
+const url = process.env.URL
+
+// CloudWatch client
+const cloudwatch = new AWS.CloudWatch();
+
+exports.handler = async (event) => {
+  // TODO: Use these variables to record metric values
+  let endTime
+  let requestWasSuccessful
+
+  const startTime = timeInMs()
+  await axios.get(url)
+
+  // Example of how to write a single data point
+  // await cloudwatch.putMetricData({
+  //   MetricData: [
+  //     {
+  //       MetricName: 'MetricName', // Use different metric names for different values, e.g. 'Latency' and 'Successful'
+  //       Dimensions: [
+  //         {
+  //           Name: 'ServiceName',
+  //           Value: serviceName
+  //         }
+  //       ],
+  //       Unit: '', // 'Count' or 'Milliseconds'
+  //       Value: 0 // Total value
+  //     }
+  //   ],
+  //   Namespace: 'Udacity/Serveless'
+  // }).promise()
+
+  // TODO: Record time it took to get a response
+  // TODO: Record if a response was successful or not
+}
+
+function timeInMs() {
+  return new Date().getTime()
+}