Does the Fulfullment Provider in v2 actually do anything? Cannot calculate shipping price.

[amaster507]

I have added the structure to my store trying to add a custom fulfillment service:

• src
  • modules
    • fulfillment-usps
      • services
        • usps-fulfillment.ts
      • index.ts

// index.ts
import { ModuleProviderExports } from "@medusajs/framework/types"
import { USPSFulfillmentService } from "./services/usps-fulfillment"

const services = [USPSFulfillmentService]

const providerExport: ModuleProviderExports = {
    services,
}

export default providerExport

// usps-fulfillment.ts
import { AbstractFulfillmentProviderService } from "@medusajs/framework/utils"
import { FulfillmentOption } from "@medusajs/types"

console.log("Loading USPS fulfillment service")

export class USPSFulfillmentService extends AbstractFulfillmentProviderService {
    static identifier = "usps"
    
    constructor() {
        console.log("Creating USPS fulfillment service")
        super()
    }

    async getFulfillmentOptions(): Promise<FulfillmentOption[]> {
        return [
            {
                id: "usps-fulfillment",
            },
            {
                id: "usps-fullfillment-return",
                is_return: true,
            }
        ]
    }

    async validateFulfillmentData(
        optionData: Record<string, unknown>,
        data: Record<string, unknown>,
        context: Record<string, unknown>
    ): Promise<any> {
        console.log("Validating USPS fulfillment data", optionData, data)
        return data
    }

    async validateOption(data: Record<string, any>): Promise<boolean> {
        console.log("Validating USPS option", data)
        return true
    }

    async createFulfillment(): Promise<Record<string, any>> {
        console.log("Creating USPS fulfillment")
        return {}
    }

    async cancelFulfillment(): Promise<any> {
        console.log("Cancelling USPS fulfillment")
        return {}
    }

    async createReturnFulfillment(): Promise<any> {
        console.log("Creating USPS return fulfillment")
        return {}
    }

    async canCalculate(data: any): Promise<boolean> {
        console.log("Checking if USPS can calculate", data)
        return true
    }

    async calculatePrice(optionData: any, data: any, cart: any): Promise<number> {
        console.log("Calculating USPS price", optionData, data, cart)
        return Promise.resolve(42.42)
    }
}

// medusa-config.js
// ...
export default defineConfig({
  // ...
  modules: {
    // ...
    [Modules.FULFILLMENT]: {
        resolve: "@medusajs/medusa/fulfillment",
        options: {
            providers: [
                {
                    resolve: "./modules/fulfillment-usps",
                    id: "usps",
                }
            ],
        },
    },
  }
})

As you see I am really just beginning development on this, and am trying to get the very basics of calling the function to calculate shipping costs and see what data the functions provide.

In my server console logs the only message I ever see from this file is the Loading USPS fulfillment service. I am expecting to see at least the Creating USPS fulfillment service, but never do.

Furthermore, when I am making a request to a <domain>/store/shipping-options and providing the cart_id param, I get the error:

{
	"type": "invalid_data",
	"message": "Shipping options with IDs so_01J9MW1FZ40Y24TFBC4FW60AAT do not have a price"
}

And while it is true that the shipping option it is referring to does not have any prices set, it is set to a calculated option, and I expect it should trigger the function calls to canCalculate and calculatePrice, but that never happens.

If I set a price to get around the error, the price is still never "calculated".

Looking at the v2 implementation of AbstractFulfillmentProviderService in the manual fulfillment service, there is not much implemented functionality.

[amaster507]

Cross Posted on Discord: https://discord.com/channels/876835651130097704/1293036383153164318

[SalahAdDin]

It could be a bug.