feat(medusa): invalidate price selection caching within update request (#3553)

* feat: invalidate price selection caching on update

* feat: add `onVariantsPricesUpdate` to PriceSelectionStrategy

* fix: update units

* fix: import

* Create .changeset/tame-pillows-heal.md

* fix: address feedback

* refactor: make `onVariantsPricesUpdate` optional

---------

Co-authored-by: fPolic <frane@medusajs.com>
Co-authored-by: Oliver Windall Juhl <59018053+olivermrbl@users.noreply.github.com>

.changeset/tame-pillows-heal.md

@@ -0,0 +1,5 @@
+---
+"@medusajs/medusa": patch
+---
+
+feat(medusa): invalidate price selection caching within update request

integration-tests/api/__tests__/admin/product.js

@@ -44,7 +44,7 @@ describe("/admin/products", () => {
     dbConnection = await initDb({ cwd })
     medusaProcess = await setupServer({
       cwd,
-      env: { MEDUSA_FF_PRODUCT_CATEGORIES: true }
+      env: { MEDUSA_FF_PRODUCT_CATEGORIES: true },
     })
   })
 
@@ -1784,7 +1784,9 @@ describe("/admin/products", () => {
         })
 
       expect(response.status).toEqual(200)
-      const variant = response.data.product.variants.find(v => v.id === variantId)
+      const variant = response.data.product.variants.find(
+        (v) => v.id === variantId
+      )
       expect(variant.prices.length).toEqual(1)
       expect(variant.prices).toEqual(
         expect.arrayContaining([

integration-tests/api/medusa-config.js

@@ -4,6 +4,7 @@ const DB_PASSWORD = process.env.DB_PASSWORD
 const DB_NAME = process.env.DB_TEMP_NAME
 
 const redisUrl = process.env.REDIS_URL || "redis://localhost:6379"
+const cacheTTL = process.env.CACHE_TTL || 15
 
 module.exports = {
   plugins: [],
@@ -17,11 +18,7 @@ module.exports = {
   modules: {
     cacheService: {
       resolve: "@medusajs/cache-inmemory",
-      // don't set cache since this is shared between tests
-      // and since we have "test-product" / "test-variant" as ids
-      // in a bunch of tests, this could cause that incorrect data is returned
-      // (e.g. price selection caches calculations under `ps:${variantId}`)
-      options: { ttl: 0 },
+      options: { ttl: cacheTTL },
     },
   },
 }

packages/medusa/src/api/routes/admin/variants/list-variants.ts

@@ -149,6 +149,7 @@ export default async (req, res) => {
     currency_code: currencyCode,
     customer_id: req.validatedQuery.customer_id,
     include_discount_prices: true,
+    ignore_cache: true,
   })
 
   res.json({

packages/medusa/src/interfaces/price-selection-strategy.ts

@@ -7,7 +7,7 @@ export interface IPriceSelectionStrategy {
   /**
    * Instantiate a new price selection strategy with the active transaction in
    * order to ensure reads are accurate.
-   * @param manager EntityManager with the queryrunner of the active transaction
+   * @param manager EntityManager with the query runner of the active transaction
    * @returns a new price selection strategy
    */
   withTransaction(manager: EntityManager): IPriceSelectionStrategy
@@ -15,15 +15,21 @@ export interface IPriceSelectionStrategy {
   /**
    * Calculate the original and discount price for a given variant in a set of
    * circumstances described in the context.
-   * @param variant The variant id of the variant for which to retrieve prices
+   * @param variantId The variant id of the variant for which to retrieve prices
    * @param context Details relevant to determine the correct pricing of the variant
    * @return pricing details in an object containing the calculated lowest price,
    * the default price an all valid prices for the given variant
    */
   calculateVariantPrice(
-    variant_id: string,
+    variantId: string,
     context: PriceSelectionContext
   ): Promise<PriceSelectionResult>
+
+  /**
+   * Notify price selection strategy that variants prices have been updated.
+   * @param variantIds The ids of the updated variants
+   */
+  onVariantsPricesUpdate(variantIds: string[]): Promise<void>
 }
 
 export abstract class AbstractPriceSelectionStrategy
@@ -34,9 +40,13 @@ export abstract class AbstractPriceSelectionStrategy
   ): IPriceSelectionStrategy
 
   public abstract calculateVariantPrice(
-    variant_id: string,
+    variantId: string,
     context: PriceSelectionContext
   ): Promise<PriceSelectionResult>
+
+  public async onVariantsPricesUpdate(variantIds: string[]): Promise<void> {
+    return void 0
+  }
 }
 
 export function isPriceSelectionStrategy(
@@ -57,6 +67,7 @@ export type PriceSelectionContext = {
   currency_code?: string
   include_discount_prices?: boolean
   tax_rates?: TaxServiceRate[]
+  ignore_cache?: boolean
 }
 
 enum DefaultPriceType {

packages/medusa/src/services/__tests__/product-variant.js

@@ -649,10 +649,14 @@ describe("ProductVariantService", () => {
       .fn()
       .mockImplementation(() => Promise.resolve())
 
-    const regionService = {
+    const priceSelectionStrategy = {
       withTransaction: function () {
         return this
       },
+      onVariantsPricesUpdate: (variantIds) => Promise.resolve(),
+    }
+
+    const regionService = {
       list: jest.fn().mockImplementation((config) => {
         const idOrIds = config.id
 
@@ -679,6 +683,7 @@ describe("ProductVariantService", () => {
       manager: MockManager,
       eventBusService,
       regionService,
+      priceSelectionStrategy,
       moneyAmountRepository,
     })
 

packages/medusa/src/services/pricing.ts

@@ -426,6 +426,7 @@ class PricingService extends TransactionBaseService {
     context: PriceSelectionContext = {}
   ): Promise<PricedVariant[]> {
     const pricingContext = await this.collectPricingContext(context)
+
     return await Promise.all(
       variants.map(async (variant) => {
         const variantPricing = await this.getProductVariantPricing(

packages/medusa/src/services/product-variant.ts

@@ -367,6 +367,10 @@ class ProductVariantService extends TransactionBaseService {
           await this.setCurrencyPrice(variantId, price)
         }
       }
+
+      await this.priceSelectionStrategy_
+        .withTransaction(manager)
+        .onVariantsPricesUpdate([variantId])
     })
   }
 

packages/medusa/src/strategies/price-selection.ts

@@ -51,11 +51,13 @@ class PriceSelectionStrategy extends AbstractPriceSelectionStrategy {
     context: PriceSelectionContext
   ): Promise<PriceSelectionResult> {
     const cacheKey = this.getCacheKey(variant_id, context)
-    const cached = await this.cacheService_
-      .get<PriceSelectionResult>(cacheKey)
-      .catch(() => void 0)
-    if (cached) {
-      return cached
+    if (!context.ignore_cache) {
+      const cached = await this.cacheService_
+        .get<PriceSelectionResult>(cacheKey)
+        .catch(() => void 0)
+      if (cached) {
+        return cached
+      }
     }
 
     let result
@@ -235,6 +237,14 @@ class PriceSelectionStrategy extends AbstractPriceSelectionStrategy {
     return result
   }
 
+  public async onVariantsPricesUpdate(variantIds: string[]): Promise<void> {
+    await Promise.all(
+      variantIds.map(
+        async (id: string) => await this.cacheService_.invalidate(`ps:${id}:*`)
+      )
+    )
+  }
+
   private getCacheKey(
     variantId: string,
     context: PriceSelectionContext

packages/medusa/src/subscribers/pricing.ts

@@ -1,30 +0,0 @@
-import { ICacheService } from "@medusajs/types"
-import { EventBusService, ProductVariantService } from "../services"
-
-type ProductVariantUpdatedEventData = {
-  id: string
-  product_id: string
-  fields: string[]
-}
-
-class PricingSubscriber {
-  protected readonly eventBus_: EventBusService
-  protected readonly cacheService_: ICacheService
-
-  constructor({ eventBusService, cacheService }) {
-    this.eventBus_ = eventBusService
-    this.cacheService_ = cacheService
-
-    this.eventBus_.subscribe(
-      ProductVariantService.Events.UPDATED,
-      async (data) => {
-        const { id, fields } = data as ProductVariantUpdatedEventData
-        if (fields.includes("prices")) {
-          await this.cacheService_.invalidate(`ps:${id}:*`)
-        }
-      }
-    )
-  }
-}
-
-export default PricingSubscriber