99 lines
2.8 KiB
JavaScript
99 lines
2.8 KiB
JavaScript
const cds = require('@sap/cds')
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const { Books, ShippingAddresses, UserMappings } = cds.entities
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const RELEVANT_ADDRESS_COLUMNS = [
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'AddressID',
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'CityName',
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'StreetName',
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'PostalCode',
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'Country',
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'HouseNumber'
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]
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const bupaSrv = cds.connect.to('API_BUSINESS_PARTNER')
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/** Service implementation for CatalogService */
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module.exports = cds.service.impl(function () {
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this.before('CREATE', 'Orders', _reduceStock)
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this.before('PATCH', 'Orders', _fillAddress)
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this.on('READ', 'Addresses', _readAddresses)
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})
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async function _readAddresses (req) {
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const businessPartnerID = await _getBusinessPartnerID(req)
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const tx = bupaSrv.transaction(req)
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const ql = SELECT.from('API_BUSINESS_PARTNER.A_BusinessPartnerAddress').where(
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{ BusinessPartner: businessPartnerID }
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)
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if (req.query && req.query.SELECT && req.query.SELECT.columns) {
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ql.columns(req.query.SELECT.columns)
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} else {
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ql.columns(RELEVANT_ADDRESS_COLUMNS)
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}
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if (req.query && req.query.SELECT && req.query.SELECT.where) {
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ql.where(req.query.SELECT.where)
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}
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const result = await tx.run(ql)
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delete result.BusinessPartner
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return result
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}
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async function _getBusinessPartnerID (req) {
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const ownTx = cds.transaction(req)
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const { businessPartnerID } = await ownTx.run(
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SELECT.one(['businessPartnerID'])
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.from(UserMappings)
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.where({ userID: req.user.id })
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)
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return businessPartnerID
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}
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/** Fill Address data from external service */
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async function _fillAddress (req) {
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if (req.data.shippingAddress_AddressID) {
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const businessPartnerID = await _getBusinessPartnerID(req)
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const tx = bupaSrv.transaction(req)
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const response = await tx.run(
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SELECT.from('API_BUSINESS_PARTNER.A_BusinessPartnerAddress')
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.columns(RELEVANT_ADDRESS_COLUMNS)
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.where({
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AddressID: req.data.shippingAddress_AddressID,
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BusinessPartner: businessPartnerID
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})
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)
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if (response && response.length > 0) {
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const tx2 = cds.transaction(req)
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try {
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await tx2.run(INSERT.into(ShippingAddresses).entries(response))
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} catch (e) {
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// already in there
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}
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} else {
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req.error('Shipping address not found.')
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}
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}
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}
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/** Reduce stock of ordered books if available stock suffices */
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async function _reduceStock (req) {
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const { Items: OrderItems } = req.data
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if (OrderItems && OrderItems.length > 0) {
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const all = await cds.transaction(req).run(() =>
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OrderItems.map(order =>
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UPDATE(Books)
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.set('stock -=', order.amount)
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.where('ID =', order.book_ID)
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.and('stock >=', order.amount)
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)
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)
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all.forEach((affectedRows, i) => {
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if (affectedRows === 0)
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req.error(
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409,
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`${OrderItems[i].amount} exceeds stock for book #${
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OrderItems[i].book_ID
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}`
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)
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})
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}
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}
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