fix(hana): reduce service manager calls for failing tenants (#533)

hana/lib/HANAService.js

@@ -38,11 +38,12 @@ class HANAService extends SQLService {
     const driver = drivers[this.options.driver || this.options.credentials?.driver]?.driver || drivers.default.driver
     const isMultitenant = 'multiTenant' in this.options ? this.options.multiTenant : cds.env.requires.multitenancy
     const service = this
+    const acquireTimeoutMillis = this.options.pool?.acquireTimeoutMillis || cds.env.profiles.includes('production') ? 1000 : 10000
     return {
       options: {
         min: 0,
         max: 10,
-        acquireTimeoutMillis: cds.env.profiles.includes('production') ? 1000 : 10000,
+        acquireTimeoutMillis,
         idleTimeoutMillis: 60000,
         evictionRunIntervalMillis: 100000,
         numTestsPerEvictionRun: Math.ceil((this.options.pool?.max || 10) - (this.options.pool?.min || 0) / 3),
@@ -60,7 +61,14 @@ class HANAService extends SQLService {
           HANAVERSION = dbc.server.major
           return dbc
         } catch (err) {
-          if (!isMultitenant || err.code !== 10) throw err
+          if (isMultitenant) {
+            // REVISIT: throw the error and break retry loop
+            // Stop trying when the tenant does not exist or is rate limited
+            if (err.status == 404 || err.status == 429)
+              return new Promise(function (_, reject) {
+                setTimeout(() => reject(err), acquireTimeoutMillis)
+              })
+          } else if (err.code !== 10) throw err
           await require('@sap/cds-mtxs/lib').xt.serviceManager.get(tenant, { disableCache: true })
           return this.create(tenant)
         }