Adding concurrency, and changing how context is set.

packages/server/src/appMigrations/migrationsProcessor.ts

@@ -13,8 +13,8 @@ export async function processMigrations(
 ) {
   console.log(`Processing app migration for "${appId}"`)
   try {
-    // have to wrap in context, this gets the tenant from the app ID
-    await context.doInAppContext(appId, async () => {
+    // first step - setup full context - tenancy, app and guards
+    await context.doInAppMigrationContext(appId, async () => {
       console.log(`Acquiring app migration lock for "${appId}"`)
       await locks.doWithLock(
         {
@@ -23,48 +23,45 @@ export async function processMigrations(
           resource: appId,
         },
         async () => {
-          await context.doInAppMigrationContext(appId, async () => {
-            console.log(`Lock acquired starting app migration for "${appId}"`)
-            let currentVersion = await getAppMigrationVersion(appId)
+          console.log(`Lock acquired starting app migration for "${appId}"`)
+          let currentVersion = await getAppMigrationVersion(appId)
 
-            const pendingMigrations = migrations
-              .filter(m => m.id > currentVersion)
-              .sort((a, b) => a.id.localeCompare(b.id))
+          const pendingMigrations = migrations
+            .filter(m => m.id > currentVersion)
+            .sort((a, b) => a.id.localeCompare(b.id))
 
-            const migrationIds = migrations.map(m => m.id).sort()
-            console.log(
-              `App migrations to run for "${appId}" - ${migrationIds.join(",")}`
-            )
+          const migrationIds = migrations.map(m => m.id).sort()
+          console.log(
+            `App migrations to run for "${appId}" - ${migrationIds.join(",")}`
+          )
 
-            let index = 0
-            for (const { id, func } of pendingMigrations) {
-              const expectedMigration =
-                migrationIds[migrationIds.indexOf(currentVersion) + 1]
+          let index = 0
+          for (const { id, func } of pendingMigrations) {
+            const expectedMigration =
+              migrationIds[migrationIds.indexOf(currentVersion) + 1]
 
-              if (expectedMigration !== id) {
-                throw new Error(
-                  `Migration ${id} could not run, update for "${id}" is running but ${expectedMigration} is expected`
-                )
-              }
-
-              const counter = `(${++index}/${pendingMigrations.length})`
-              console.info(`Running migration ${id}... ${counter}`, {
-                migrationId: id,
-                appId,
-              })
-              await func()
-              await updateAppMigrationMetadata({
-                appId,
-                version: id,
-              })
-              currentVersion = id
+            if (expectedMigration !== id) {
+              throw new Error(
+                `Migration ${id} could not run, update for "${id}" is running but ${expectedMigration} is expected`
+              )
             }
-          })
+
+            const counter = `(${++index}/${pendingMigrations.length})`
+            console.info(`Running migration ${id}... ${counter}`, {
+              migrationId: id,
+              appId,
+            })
+            await func()
+            await updateAppMigrationMetadata({
+              appId,
+              version: id,
+            })
+            currentVersion = id
+          }
         }
       )
-
-      console.log(`App migration for "${appId}" processed`)
     })
+    console.log(`App migration for "${appId}" processed`)
   } catch (err) {
     logging.logAlert("Failed to run app migration", err)
     throw err

packages/server/src/appMigrations/queue.ts

@@ -2,9 +2,10 @@ import { queue, logging } from "@budibase/backend-core"
 import { Job } from "bull"
 import { MIGRATIONS } from "./migrations"
 import { processMigrations } from "./migrationsProcessor"
-import { apiEnabled } from "../features"
 
-const MAX_ATTEMPTS = 1
+const MAX_ATTEMPTS = 3
+// max number of migrations to run at same time, per node
+const MIGRATION_CONCURRENCY = 5
 
 export type AppMigrationJob = {
   appId: string
@@ -13,10 +14,6 @@ export type AppMigrationJob = {
 let appMigrationQueue: queue.Queue<AppMigrationJob> | undefined
 
 export function init() {
-  // only run app migrations in main API services
-  if (!apiEnabled()) {
-    return
-  }
   appMigrationQueue = queue.createQueue<AppMigrationJob>(
     queue.JobQueue.APP_MIGRATION,
     {
@@ -34,10 +31,10 @@ export function init() {
     }
   )
 
-  return appMigrationQueue.process(processMessage)
+  return appMigrationQueue.process(MIGRATION_CONCURRENCY, processMessage)
 }
 
-async function processMessage(job: Job) {
+async function processMessage(job: Job<AppMigrationJob>) {
   const { appId } = job.data
 
   await processMigrations(appId, MIGRATIONS)

packages/server/src/startup/index.ts

@@ -115,8 +115,9 @@ export async function startup(
   // configure events to use the pro audit log write
   // can't integrate directly into backend-core due to cyclic issues
   queuePromises.push(events.processors.init(pro.sdk.auditLogs.write))
-  queuePromises.push(appMigrations.init())
+  // app migrations and automations on other service
   if (automationsEnabled()) {
+    queuePromises.push(appMigrations.init())
     queuePromises.push(automations.init())
   }
   queuePromises.push(initPro())