Allow passing a full json file (#164)

* Allow passing a full json file

Signed-off-by: Emerson Knapp <eknapp@amazon.com>

.github/workflows/generate-metrics-file.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+set -euxo pipefail
+
+now=$(date +%s)
+
+cat << EOF > metrics.json
+[
+    {
+        "MetricName": "test-bytes-metric",
+        "Timestamp": ${now},
+        "Unit": "Bytes",
+        "Value": 20
+    },
+    {
+        "MetricName": "test-seconds-metric",
+        "Timestamp": ${now},
+        "Unit": "Seconds",
+        "Value": 11
+    }
+]
+EOF

.github/workflows/test.yml

@@ -24,6 +24,29 @@ jobs:
         node-version: '12.x'
     - run: .github/workflows/build-and-test.sh
 
+  test_metrics_file_input:
+    runs-on: ubuntu-latest
+    container:
+      image: ubuntu:bionic
+    if: ${{ ! github.event.repository.fork && ! github.event.pull_request.head.repo.fork }}
+    steps:
+    # Run with a valid metrics JSON file just to make sure that it doesn't crash when doing so
+    - uses: actions/checkout@v2
+    - uses: actions/setup-node@v1
+      with:
+        node-version: '12.x'
+    - name: Configure AWS Credentials
+      uses: aws-actions/configure-aws-credentials@v1
+      with:
+        aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
+        aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+        aws-region: ${{ secrets.AWS_REGION }}
+    - run: .github/workflows/generate-metrics-file.sh
+    - uses: ./
+      with:
+        namespace: ActionCloudWatchMetricsTests
+        metric-data: metrics.json
+
   log_workflow_status_to_cloudwatch:
     runs-on: ubuntu-latest
     container:

__tests__/main.test.ts

@@ -16,6 +16,8 @@ describe("unit test suite", () => {
 					return "1.0";
 				case "metric-dimensions":
 					return "[]";
+				case "metric-data":
+					return "";
 			}
 			throw new Error("unknown input");
 		});

action.yml

@@ -24,6 +24,12 @@ inputs:
         { "Name": "github.ref", "Value": "${{ github.ref }}" },
         { "Name": "github.repository", "Value": "${{ github.repository }}" }
       ]
+  metric-data:
+    description: >-
+      Path to a JSON file containing CloudWatch-compatible metrics, according to
+      https://awscli.amazonaws.com/v2/documentation/api/latest/reference/cloudwatch/put-metric-data.html
+      If this input is specified, the action will ignore the single-value inputs "metric-name", "metric-value", "metric-dimensions" and only publish the data from this file.
+    required: false
 
   namespace:
     description: 'The namespace for the metric data.'

src/cw-build-status.ts

@@ -1,4 +1,5 @@
 import * as core from "@actions/core";
+import * as fs from "fs";
 import CloudWatch from "aws-sdk/clients/cloudwatch";
 
 /**
@@ -9,26 +10,35 @@ export async function run() {
 		const namespace = core.getInput("namespace", { required: true });
 		const metricName = core.getInput("metric-name", { required: true });
 		const metricValue = core.getInput("metric-value", { required: true });
-		let metricValueAsFloat = 0.0;
-		switch (metricValue) {
-			case "true":
-				metricValueAsFloat = 1.0;
-				break;
-			case "false":
-				metricValueAsFloat = 0.0;
-				break;
-			default:
-				metricValueAsFloat = Number(metricValue);
+		const metricDataPath = core.getInput("metric-data", { required: false });
+
+		let metricData = [];
+		if (metricDataPath) {
+			const contents = fs.readFileSync(metricDataPath, 'utf8');
+			metricData = JSON.parse(contents);
+		} else {
+			let metricValueAsFloat = 0.0;
+			switch (metricValue) {
+				case "true":
+					metricValueAsFloat = 1.0;
+					break;
+				case "false":
+					metricValueAsFloat = 0.0;
+					break;
+				default:
+					metricValueAsFloat = Number(metricValue);
+			}
+			const metricDimensions = core.getInput("metric-dimensions", {
+				required: true,
+			});
+			const metricDatum = {
+				MetricName: metricName,
+				Value: metricValueAsFloat,
+				Dimensions: JSON.parse(metricDimensions),
+			};
+			metricData = [metricDatum];
 		}
-		const metricDimensions = core.getInput("metric-dimensions", {
-			required: true,
-		});
-		const metricDatum = {
-			MetricName: metricName,
-			Value: metricValueAsFloat,
-			Dimensions: JSON.parse(metricDimensions),
-		};
-		const metricData = [metricDatum];
+
 		core.info(
 			`Publishing metrics ${JSON.stringify(
 				metricData,