Add example container source for ASCII cows

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

README.md

@@ -41,7 +41,8 @@ cows.yaml:
 
 ```yaml
 $ cat <<EOF > cows.yaml
-image: alexellis2/cows:latest
+# Multi-arch image for arm64, amd64 and armv7l
+image: alexellis2/cows:2022-09-05-1955
 name: cows
 EOF
 ```

cows.yaml

@@ -1,4 +1,3 @@
-# Note: this is not a multi-arch image
-# and won't run on your Raspberry Pi
-image: alexellis2/cows:latest
+# Multi-arch image for arm64, amd64 and armv7l
+image: alexellis2/cows:2022-09-05-1955
 name: cows

examples/cows/.gitignore

@@ -0,0 +1,3 @@
+template
+build
+node_modules

examples/cows/Dockerfile

@@ -0,0 +1,23 @@
+FROM --platform=${TARGETPLATFORM:-linux/amd64} alpine:3.16 as builder
+
+ARG TARGETPLATFORM
+ARG BUILDPLATFORM
+ARG TARGETOS
+ARG TARGETARCH
+
+RUN mkdir -p /home/app
+
+RUN apk add --no-cache nodejs npm
+
+# Add non root user
+RUN addgroup -S app && adduser app -S -G app
+RUN chown app /home/app
+
+WORKDIR /home/app
+USER app
+
+COPY package.json    .
+RUN npm install --omit=dev
+COPY index.js        .
+
+CMD ["/usr/bin/node", "./index.js"]

examples/cows/Makefile

@@ -0,0 +1,3 @@
+.PHONY: build
+build:
+	faas-cli publish --platforms linux/amd64,linux/arm64,linux/arm/v7 -f cows.yml

examples/cows/index.js

@@ -0,0 +1,21 @@
+var cows = require('cows')
+var all = cows();
+
+function show(cow) {
+    var cowText = all[cow];
+    console.log(cowText);
+}
+
+var cowArgument = process.argv[2]
+if(!cowArgument || isNaN(Number(cowArgument))) {
+  var randomCow = Math.floor((Math.random() * all.length) + 1);
+  show(randomCow);
+}
+else {
+  var cowNumber = Number(cowArgument);
+  if(cowNumber && cowNumber <= all.length) {
+    show(cowNumber);
+  } else {
+    console.log("Enter cow number between [1-"+all.length+"]")
+  }
+}

examples/cows/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "cows",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "cows": "^2.1.1"
+  }
+}

examples/cows/stack.yml

@@ -0,0 +1,10 @@
+version: 1.0
+provider:
+  name: openfaas
+  gateway: http://127.0.0.1:8080
+
+functions:
+  cows:
+    lang: dockerfile
+    handler: ./
+    image: alexellis2/cows:2022-09-05-1955