use compute serviceEndpoint from DDO

src/brizo/Brizo.ts

@@ -2,6 +2,8 @@ import { File, MetaData } from '../ddo/MetaData'
 import Account from '../ocean/Account'
 import { noZeroX } from '../utils'
 import { Instantiable, InstantiableConfig } from '../Instantiable.abstract'
+import { DDO } from '../ddo/DDO'
+import { ServiceType } from '../ddo/Service'
 
 const apiPath = '/api/v1/brizo/services'
 
@@ -39,6 +41,18 @@ export class Brizo extends Instantiable {
         return `${this.url}${apiPath}/compute`
     }
 
+    public async getEndpointFromAgreement(
+        type: ServiceType,
+        agreementId: string
+    ): Promise<string> {
+        const { assets, keeper } = this.ocean
+        const { did } = await keeper.agreementStoreManager.getAgreement(agreementId)
+        const ddo: DDO = await assets.resolve(did)
+        const { serviceEndpoint } = ddo.findServiceByType(type)
+
+        return serviceEndpoint
+    }
+
     public async initializeServiceAgreement(
         did: string,
         serviceAgreementId: string,
@@ -105,9 +119,19 @@ export class Brizo extends Instantiable {
     ): Promise<any> {
         const signature = await this.createSignature(consumerAccount, serviceAgreementId)
         const address = consumerAccount.getId()
+        const serviceEndpoint = await this.getEndpointFromAgreement(
+            'compute',
+            serviceAgreementId
+        )
+
+        if (!serviceEndpoint) {
+            throw new Error(
+                'Computing on asset failed, service definition is missing the `serviceEndpoint`.'
+            )
+        }
 
         // construct Brizo URL
-        let url = this.getComputeEndpoint()
+        let url = serviceEndpoint
         url += `&signature=${signature}`
         url += `&consumerAddress=${address}`
         url += `&serviceAgreementId=${noZeroX(serviceAgreementId)}`