51 lines
1.8 KiB
JavaScript
51 lines
1.8 KiB
JavaScript
////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Mashing up provided and required services...
|
|
//
|
|
module.exports = async()=>{ // called by server.js
|
|
|
|
if (!cds.services.AdminService) return //> mocking S4 service only
|
|
|
|
// Connect to services we want to mashup below...
|
|
const S4bupa = await cds.connect.to('API_BUSINESS_PARTNER') //> external S4 service
|
|
const admin = await cds.connect.to('AdminService') //> local domain service
|
|
const db = await cds.connect.to('db') //> our primary database
|
|
|
|
// Reflect CDS definition of the Suppliers entity
|
|
const { Suppliers } = db.entities
|
|
|
|
admin.prepend (()=>{ //> to ensure our .on handlers below go before the default ones
|
|
|
|
// Delegate Value Help reads for Suppliers to S4 backend
|
|
admin.on ('READ', 'Suppliers', req => {
|
|
console.log ('>> delegating to S4 service...')
|
|
return S4bupa.run(req.query)
|
|
})
|
|
|
|
// Replicate Supplier data when edited Books have suppliers
|
|
admin.after (['CREATE','UPDATE'], 'Books', async data => {
|
|
const { supplier_ID: ID } = data
|
|
if (ID) {
|
|
let replicated = await db.exists (Suppliers,ID)
|
|
if (!replicated) { // initially replicate Supplier info
|
|
let supplier = await S4bupa.read (Suppliers,ID)
|
|
await INSERT(supplier) .into (Suppliers)
|
|
}
|
|
}
|
|
})
|
|
|
|
})
|
|
|
|
// Subscribe to changes in the S4 origin of Suppliers data
|
|
S4bupa.on ('BusinessPartner.Changed', async msg => { //> would be great if we had batch events from S/4
|
|
console.log(">>", msg.event, msg.data)
|
|
const ID = msg.data.BusinessPartner;
|
|
let replicated = await db.exists (Suppliers,ID)
|
|
if (replicated) { // update replicated Supplier info
|
|
let supplier = await S4bupa.read (Suppliers,ID)
|
|
await UPDATE(Suppliers,ID) .with (supplier)
|
|
}
|
|
})
|
|
|
|
}
|