Orchestrate using Docker with nginx

Author: julianduque

docker-compose.yml

@@ -0,0 +1,27 @@
+web:
+  image: nginx
+  links:
+    - upload
+    - preview
+    - save
+  ports:
+    - "8000:80"
+  volumes:
+    - ./microservices.conf:/etc/nginx/conf.d/microservices.conf
+  command: [nginx, '-g', 'daemon off;']
+
+upload:
+  build: ./upload
+  environment:
+    - AWS_ACCESS_KEY=${AWS_ACCESS_KEY}
+    - AWS_SECRET_KEY=${AWS_SECRET_KEY}
+preview:
+  build: ./preview
+  environment:
+    - AWS_ACCESS_KEY=${AWS_ACCESS_KEY}
+    - AWS_SECRET_KEY=${AWS_SECRET_KEY}
+save:
+  build: ./save
+  environment:
+    - AWS_ACCESS_KEY=${AWS_ACCESS_KEY}
+    - AWS_SECRET_KEY=${AWS_SECRET_KEY}

microservices.conf

@@ -0,0 +1,52 @@
+upstream backend_upload {
+  server upload:3000;
+}
+
+upstream backend_preview {
+  server preview:3000;
+}
+
+upstream backend_save {
+  server save:3000;
+}
+
+server {
+  listen      80;
+  server_name microservices;
+
+  location /upload {
+    proxy_set_header    Host $host;
+    proxy_set_header    X-Real-IP $remote_addr;
+    proxy_set_header    X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header    X-Forwarded-Proto $scheme;
+    proxy_http_version  1.1;
+
+    if ($request_uri ~* "/upload(.*)") {
+      proxy_pass http://backend_upload$1;
+    }
+  }
+
+  location /preview {
+    proxy_set_header    Host $host;
+    proxy_set_header    X-Real-IP $remote_addr;
+    proxy_set_header    X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header    X-Forwarded-Proto $scheme;
+    proxy_http_version  1.1;
+
+    if ($request_uri ~* "/preview(.*)") {
+      proxy_pass http://backend_preview$1;
+    }
+  }
+
+  location /save {
+    proxy_set_header    Host $host;
+    proxy_set_header    X-Real-IP $remote_addr;
+    proxy_set_header    X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header    X-Forwarded-Proto $scheme;
+    proxy_http_version  1.1;
+
+    if ($request_uri ~* "/save(.*)") {
+      proxy_pass http://backend_save$1;
+    }
+  }
+}

preview/Dockerfile

@@ -0,0 +1,18 @@
+FROM node:6.10.2-alpine
+
+COPY . /src/app
+WORKDIR /src/app
+
+RUN apk add --no-cache \
+    build-base \
+    g++ \
+    cairo-dev \
+    jpeg-dev \
+    pango-dev \
+    giflib-dev
+RUN npm install
+RUN npm install -g micro
+
+EXPOSE 3000
+
+CMD [ "micro", "image-preview.js" ]

preview/image-preview.js

@@ -1,12 +1,18 @@
 'use strict'
 
-const fs = require('fs')
-const path = require('path')
 const mime = require('mime-types')
+const S3 = require('aws-sdk/clients/s3')
 const { send, json } = require('micro')
 const Filter = require('instagram_js_filter')
 const effects = new Filter()
 
+const s3 = new S3({
+  region: 'us-west-2',
+  params: { Bucket: 'medellinjs-microservicios' },
+  accessKeyId: process.env.AWS_ACCESS_KEY,
+  secretAccessKey: process.env.AWS_SECRET_KEY
+})
+
 //
 // This microservice will be served as /preview
 //
@@ -36,13 +42,16 @@ module.exports = async function (req, res) {
 //
 // Convert an image and applies a filter
 //
-function convert (src, filter) {
+function convert (name, filter) {
   return new Promise((resolve, reject) => {
-    fs.readFile(path.join(__dirname, 'uploads', src), (err, buffer) => {
+    s3.getObject({
+      Key: `uploads/${name}`
+    }, (err, result) => {
       if (err) return reject(err)
 
-      const result = effects.apply(buffer, filter, {})
-      resolve(result)
+      const image = effects.apply(result.Body, filter, {})
+
+      resolve(new Buffer(image, 'base64'))
     })
   })
 }

preview/package.json

@@ -16,6 +16,7 @@
   },
   "homepage": "https://github.com/julianduque/microservices-demo#readme",
   "dependencies": {
+    "aws-sdk": "^2.43.0",
     "instagram_js_filter": "^1.4.0",
     "micro": "^7.3.2",
     "mime-types": "^2.1.15"

rules.js

@@ -0,0 +1,18 @@
+FROM node:6.10.2-alpine
+
+COPY . /src/app
+WORKDIR /src/app
+
+RUN apk add --no-cache \
+    build-base \
+    g++ \
+    cairo-dev \
+    jpeg-dev \
+    pango-dev \
+    giflib-dev
+RUN npm install
+RUN npm install -g micro
+
+EXPOSE 3000
+
+CMD [ "micro", "image-save.js" ]

save/Dockerfile

@@ -0,0 +1,11 @@
+FROM node:6.10.2-alpine
+
+COPY . /src/app
+WORKDIR /src/app
+
+RUN npm install
+RUN npm install -g micro
+
+EXPOSE 3000
+
+CMD [ "micro", "image-upload.js" ]