Introduced bookstore composite app

bookstore/db/hana/index.cds

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+//
+//  Add Author.age and .lifetime with a DB-specific function
+//
+
+using { AdminService } from '../schema';
+
+extend projection AdminService.Authors with {
+  YEARS_BETWEEN(dateOfBirth, dateOfDeath)         as age: Integer,
+  YEAR(dateOfBirth) || ' – ' || YEAR(dateOfDeath) as lifetime : String
+}

bookstore/db/schema.cds

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+using { sap.capire.bookshop } from '@capire/bookshop';
+
+// Forward-declare calculated fields to be filled in database-specific ways
+// TODO find a better way to have 'default' fields that still can be overwritten.
+extend bookshop.Authors with {
+	virtual age: Integer;
+	virtual lifetime: String;
+}

bookstore/db/sqlite/index.cds

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+//
+//  Add Author.age and .lifetime with a DB-specific function
+//
+
+using { AdminService } from '../schema';
+
+extend projection AdminService.Authors with {
+  strftime('%Y',dateOfDeath)-strftime('%Y',dateOfBirth)              as age: Integer,
+  strftime('%Y',dateOfBirth) || ' – ' || strftime('%Y',dateOfDeath)  as lifetime : String
+}

bookstore/package.json

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+{
+  "name": "@capire/bookstore",
+  "version": "1.0.0",
+  "dependencies": {
+    "@capire/bookshop": "*",
+    "@capire/reviews": "*",
+    "@capire/orders": "*",
+    "@capire/common": "*",
+    "@sap/cds": "^5",
+    "express": "^4.17.1"
+  },
+  "cds": {
+    "requires": {
+      "ReviewsService": {
+        "kind": "odata",
+        "model": "@capire/reviews"
+      },
+      "messaging": {
+        "[production]": { "kind": "enterprise-messaging" },
+        "[hybrid]": { "kind": "enterprise-messaging-shared" },
+        "[local]": { "kind": "file-based-messaging" },
+        "kind": "local-messaging"
+      },
+      "db": { "kind": "sql" }
+    },
+    "log": { "service": true }
+  }
+}

bookstore/server.js

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+const cds = require ('@sap/cds')
+
+// Add mashup logic
+cds.once('served', require('./srv/mashup'))
+
+// Add routes to UIs from imported packages
+cds.once('bootstrap',(app)=>{
+  app.serve ('/bookshop') .from ('@capire/bookshop','app/vue')
+  app.serve ('/reviews') .from ('@capire/reviews','app/vue')
+  app.serve ('/orders') .from('@capire/orders','app/orders')
+})
+
+// Add Swagger UI
+require('./srv/swagger-ui')
+
+// Returning cds.server
+module.exports = cds.server

bookstore/srv/mashup.cds

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+////////////////////////////////////////////////////////////////////////////
+//
+//    Enhancing bookshop with Reviews and Orders provided through
+//    respective reuse packages and services
+//
+
+using { sap.capire.bookshop.Books } from '@capire/bookshop';
+
+//
+//  Extend Books with access to Reviews and average ratings
+//
+using { ReviewsService.Reviews } from '@capire/reviews';
+extend Books with {
+  reviews : Composition of many Reviews on reviews.subject = $self.ID;
+  rating  : Decimal;
+  numberOfReviews : Integer;
+}
+
+
+//
+//  Extend Orders with Books as Products
+//
+using { sap.capire.orders.Orders_Items } from '@capire/orders';
+extend Orders_Items with {
+  book : Association to Books on product.ID = book.ID
+}
+
+
+// Add orders fiori app (in case of embedded orders service)
+using from '@capire/orders/app/fiori';

bookstore/srv/mashup.js

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+////////////////////////////////////////////////////////////////////////////
+//
+//    Mashing up bookshop services with required services...
+//
+module.exports = async()=>{ // called by server.js
+
+  const cds = require('@sap/cds')
+  const CatalogService = await cds.connect.to ('CatalogService')
+  const ReviewsService = await cds.connect.to ('ReviewsService')
+  const OrdersService = await cds.connect.to ('OrdersService')
+  const db = await cds.connect.to ('db')
+
+  // reflect entity definitions used below...
+  const { Books } = db.entities ('sap.capire.bookshop')
+
+  //
+  // Delegate requests to read reviews to the ReviewsService
+  // Note: prepend is neccessary to intercept generic default handler
+  //
+  CatalogService.prepend (srv => srv.on ('READ', 'Books/reviews', (req) => {
+    console.debug ('> delegating request to ReviewsService')
+    const [id] = req.params, { columns, limit } = req.query.SELECT
+    return ReviewsService.tx(req).read ('Reviews',columns).limit(limit).where({subject:String(id)})
+  }))
+
+  //
+  // Create an order with the OrdersService when CatalogService signals a new order
+  //
+  CatalogService.on ('OrderedBook', async (msg) => {
+    const { book, quantity, buyer } = msg.data
+    const { title, price } = await db.tx(msg).read (Books, book, b => { b.title, b.price })
+    return OrdersService.tx(msg).create ('Orders').entries({
+      OrderNo: 'Order at '+ (new Date).toLocaleString(),
+      Items: [{ product:{ID:`${book}`}, title, price, quantity }],
+      buyer, createdBy: buyer
+    })
+  })
+
+  //
+  // Update Books' average ratings when ReviewsService signals updatd reviews
+  //
+  ReviewsService.on ('reviewed', (msg) => {
+    console.debug ('> received:', msg.event, msg.data)
+    const { subject, count, rating } = msg.data
+    return UPDATE(Books,subject).with({ numberOfReviews:count, rating })
+    // ^ Note: the framework will execute this and take care for db.tx
+  })
+
+  //
+  // Reduce stock of ordered books for orders are created from Orders admin UI
+  //
+  OrdersService.on ('OrderChanged', (msg) => {
+    console.debug ('> received:', msg.event, msg.data)
+    const { product, deltaQuantity } = msg.data
+    return UPDATE (Books) .where ('ID =', product)
+    .and ('stock >=', deltaQuantity)
+    .set ('stock -=', deltaQuantity)
+  })
+}

bookstore/srv/swagger-ui.js

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+
+// -----------------------------------------------------------------------
+// Adding Swagger UI - see https://cap.cloud.sap/docs/advanced/openapi
+const cds = require ('@sap/cds')
+try {
+  const cds_swagger = require ('cds-swagger-ui-express')
+  cds.once ('bootstrap', app => app.use (cds_swagger()) )
+} catch (err) {
+  if (err.code !== 'MODULE_NOT_FOUND')  throw err
+}

bookstore/test/requests.http

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+
+@bookshop = http://localhost:4004
+@reviews-service = {{bookshop}}/reviews
+# Uncomment this when running a separate reviews service
+# @reviews-service = http://localhost:4005/reviews
+
+
+
+#################################################
+#
+#   Reviews Service
+#
+
+GET {{reviews-service}}/Reviews
+
+###
+
+POST {{reviews-service}}/Reviews
+Authorization: Basic {{$processEnv USER}}:
+Content-Type: application/json
+
+{"subject":"201", "title":"boo", "rating":3 }
+
+
+
+#################################################
+#
+#   Bookshop Services
+#
+
+GET {{bookshop}}/browse/Books/201/reviews?
+&$select=rating,date,title
+&$top=3
+
+###
+
+GET {{bookshop}}/browse/Books(201)?
+&$select=ID,title,rating
+&$expand=reviews
+
+###
+
+GET {{bookshop}}/browse/Books?
+  &$select=title,author&$expand=currency
+Accept-Language: de
+
+#################################################
+#
+#   Orders Service, incl. draft choreography
+#
+@newOrderID = e939604c-ab83-4d4f-bdb6-95fe30b3773e
+
+GET {{bookshop}}/orders/Orders
+
+### Create order, still inactive
+POST {{bookshop}}/orders/Orders
+Content-Type: application/json
+
+{"ID": "{{newOrderID}}"}
+
+### Get inactive order.  We have to specify `IsActiveEntity`.
+GET {{bookshop}}/orders/Orders(ID={{newOrderID}},IsActiveEntity=false)
+
+### Activate order using `.../<servicename>.draftActivate`
+POST {{bookshop}}/orders/Orders(ID={{newOrderID}},IsActiveEntity=false)/OrdersService.draftActivate
+Content-Type: application/json
+
+### Get active order
+GET {{bookshop}}/orders/Orders(ID={{newOrderID}},IsActiveEntity=true)
+
+### Create author
+POST {{bookshop}}/admin/Authors
+Content-Type: application/json
+Authorization: Basic alice:
+
+{
+  "ID": 200,
+  "name": "William Shakespeare",
+  "dateOfBirth": "1564-04-26",
+  "dateOfDeath": "1616-04-23"
+}