feat(migration): improve progress as migration is running

dev/test-studio/migrations/rename-location-to-address/index.ts

@@ -1,12 +1,24 @@
 import {defineMigration} from '@sanity/migrate'
-import {at, patch, set} from '@sanity/migrate/mutations'
+import {at, patch, set, unset} from '@sanity/migrate/mutations'
+
+const addresses = [
+  {city: 'Oslo', country: 'Norway'},
+  {city: 'Stockholm', country: 'Sweden'},
+  {city: 'Copenhagen', country: 'Denmark'},
+  {city: 'Helsinki', country: 'Finland'},
+  {city: 'Reykjavik', country: 'Iceland'},
+  {city: 'Torshavn', country: 'Faroe Islands'},
+]
 
 export default defineMigration({
   name: 'Rename Location to Address',
   documentType: 'author',
   migrate: {
     document(doc) {
-      return patch(doc._id, [at('address', set('Somehwere'))])
+      return patch(doc._id, [
+        at('address', set(addresses[Math.floor(Math.random() * addresses.length)])),
+        at('location', unset()),
+      ])
     },
   },
 })

packages/@sanity/migrate/src/destinations/commitMutations.ts

@@ -4,18 +4,16 @@ import {parseJSON} from '../it-utils/json'
 import {decodeText} from '../it-utils/decodeText'
 import {concatStr} from '../it-utils/concatStr'
 import {lastValueFrom} from '../it-utils/lastValueFrom'
+import {mapAsync} from '../it-utils/mapAsync'
 
 export async function commitMutations(
   fetchOptions: AsyncIterableIterator<FetchOptions>,
   options: {concurrency: number},
 ) {
-  // todo: convert to top level import when we can
-  const {pMapIterable} = await import('p-map')
-
-  return pMapIterable(
+  return mapAsync(
     fetchOptions,
     async (opts): Promise<MultipleMutationResult> =>
       lastValueFrom(parseJSON(concatStr(decodeText(await fetchAsyncIterator(opts))))),
-    {concurrency: options.concurrency},
+    options.concurrency,
   )
 }

packages/@sanity/migrate/src/it-utils/mapAsync.ts

@@ -0,0 +1,12 @@
+export async function mapAsync<T, U>(
+  it: AsyncIterableIterator<T>,
+  project: (value: T) => Promise<U>,
+  concurrency: number,
+): Promise<AsyncIterable<U>> {
+  // todo: convert to top level import when we can
+  const {pMapIterable} = await import('p-map')
+
+  return pMapIterable(it, (v) => project(v), {
+    concurrency: concurrency,
+  })
+}

packages/@sanity/migrate/src/it-utils/tap.ts

@@ -0,0 +1,6 @@
+export async function* tap<T>(it: AsyncIterableIterator<T>, interceptor: (value: T) => void) {
+  for await (const chunk of it) {
+    interceptor(chunk)
+    yield chunk
+  }
+}

packages/@sanity/migrate/src/runner/run.ts

@@ -1,23 +1,40 @@
 import {SanityDocument} from '@sanity/types'
 import {MultipleMutationResult, Mutation as SanityMutation} from '@sanity/client'
+import {Mutation} from '@bjoerge/mutiny'
+import arrify from 'arrify'
 import {APIConfig, Migration} from '../types'
 import {ndjson} from '../it-utils/ndjson'
 import {fromExportEndpoint} from '../sources/fromExportEndpoint'
 import {endpoints} from '../fetch-utils/endpoints'
 import {toFetchOptions} from '../fetch-utils/sanityRequestOptions'
-import {commitMutations} from '../destinations/commitMutations'
-import {collectMigrationMutations} from './collectMigrationMutations'
-import {batchMutations} from './utils/batchMutations'
+import {tap} from '../it-utils/tap'
+import {mapAsync} from '../it-utils/mapAsync'
+import {lastValueFrom} from '../it-utils/lastValueFrom'
+import {decodeText, parseJSON} from '../it-utils'
+import {concatStr} from '../it-utils/concatStr'
+import {fetchAsyncIterator, FetchOptions} from '../fetch-utils/fetchStream'
+import {toSanityMutations} from './utils/toSanityMutations'
 import {
   DEFAULT_MUTATION_CONCURRENCY,
   MAX_MUTATION_CONCURRENCY,
   MUTATION_ENDPOINT_MAX_BODY_SIZE,
 } from './constants'
-import {toSanityMutations} from './utils/toSanityMutations'
+import {batchMutations} from './utils/batchMutations'
+import {collectMigrationMutations} from './collectMigrationMutations'
 
+type MigrationProgress = {
+  documents: number
+  mutations: number
+  pending: number
+  queuedBatches: number
+  currentMutations: Mutation[]
+  completedTransactions: MultipleMutationResult[]
+  done?: boolean
+}
 interface MigrationRunnerOptions {
   api: APIConfig
   concurrency?: number
+  onProgress?: (event: MigrationProgress) => void
 }
 
 export async function* toFetchOptionsIterable(
@@ -35,32 +52,62 @@ export async function* toFetchOptionsIterable(
     })
   }
 }
-export async function* run(config: MigrationRunnerOptions, migration: Migration) {
-  const mutations = collectMigrationMutations(
-    migration,
+export async function run(config: MigrationRunnerOptions, migration: Migration) {
+  const stats: MigrationProgress = {
+    documents: 0,
+    mutations: 0,
+    pending: 0,
+    queuedBatches: 0,
+    completedTransactions: [],
+    currentMutations: [],
+  }
+  const documents = tap(
     ndjson(await fromExportEndpoint(config.api)) as AsyncIterableIterator<SanityDocument>,
+    () => {
+      config.onProgress?.({...stats, documents: ++stats.documents})
+    },
   )
 
+  const mutations = tap(collectMigrationMutations(migration, documents), (muts) => {
+    stats.currentMutations = arrify(muts)
+    config.onProgress?.({
+      ...stats,
+      mutations: ++stats.mutations,
+    })
+  })
+
   const concurrency = config?.concurrency ?? DEFAULT_MUTATION_CONCURRENCY
 
   if (concurrency > MAX_MUTATION_CONCURRENCY) {
     throw new Error(`Concurrency exceeds maximum allowed value (${MAX_MUTATION_CONCURRENCY})`)
   }
 
-  const batches = batchMutations(toSanityMutations(mutations), MUTATION_ENDPOINT_MAX_BODY_SIZE)
+  const batches = tap(
+    batchMutations(toSanityMutations(mutations), MUTATION_ENDPOINT_MAX_BODY_SIZE),
+    () => {
+      config.onProgress?.({...stats, queuedBatches: ++stats.queuedBatches})
+    },
+  )
 
-  const commits = await commitMutations(toFetchOptionsIterable(config.api, batches), {concurrency})
+  const submit = async (opts: FetchOptions): Promise<MultipleMutationResult> =>
+    lastValueFrom(parseJSON(concatStr(decodeText(await fetchAsyncIterator(opts)))))
 
+  const commits = await mapAsync(
+    toFetchOptionsIterable(config.api, batches),
+    (opts) => {
+      config.onProgress?.({...stats, pending: ++stats.pending})
+      return submit(opts)
+    },
+    concurrency,
+  )
   for await (const result of commits) {
-    yield formatMutationResponse(result)
+    stats.completedTransactions.push(result)
+    config.onProgress?.({
+      ...stats,
+    })
   }
-}
-
-function formatMutationResponse(mutationResponse: MultipleMutationResult) {
-  return `OK (transactionId = ${mutationResponse.transactionId})
-${mutationResponse.results
-  .map((result) => {
-    return ` - ${result.operation}: ${result.id}`
+  config.onProgress?.({
+    ...stats,
+    done: true,
   })
-  .join('\n')}`
 }

packages/sanity/src/_internal/cli/commands/migration/runMigrationCommand.ts

@@ -12,7 +12,8 @@ import {
   run,
 } from '@sanity/migrate'
 import {SanityDocument} from '@sanity/types'
-import {format} from './mutationFormatter'
+import {Mutation} from '@bjoerge/mutiny'
+import {format, formatMutation} from './utils/mutationFormatter'
 
 const helpText = `
 Options
@@ -125,7 +126,6 @@ const createMigrationCommand: CliCommandDefinition<CreateFlags> = {
           MAX_MUTATION_CONCURRENCY,
         )
       }
-      concurrency = MAX_MUTATION_CONCURRENCY
     }
 
     const {dataset, projectId, apiHost, token} = apiClient({
@@ -141,13 +141,46 @@ const createMigrationCommand: CliCommandDefinition<CreateFlags> = {
       apiVersion: 'v2024-01-09',
     } as const
 
-    const progress = dry
+    const spinner = output.spinner('Running migration…').start()
+    await (dry
       ? dryRun({api: apiConfig}, migration, context)
-      : run({api: apiConfig, concurrency}, migration)
-
-    for await (const result of progress) {
-      output.print(result)
-    }
+      : run(
+          {
+            api: apiConfig,
+            concurrency,
+            onProgress(progress) {
+              if (progress.done) {
+                spinner.text = `Migration "${migrationName}" completed.
+
+Project id:  ${chalk.bold(projectId)}
+Dataset:     ${chalk.bold(dataset)}
+
+${progress.documents} documents processed.
+${progress.mutations} mutations generated.
+${chalk.green(progress.completedTransactions.length)} transactions committed.`
+                spinner.stopAndPersist({symbol: chalk.green('✔')})
+                return
+              }
+
+              ;['', ...progress.currentMutations].forEach((mutation) => {
+                spinner.text = `Running migration "${migrationName}"…
+
+Project id:     ${chalk.bold(projectId)}
+Dataset:        ${chalk.bold(dataset)}
+Document type:  ${chalk.bold(migration.documentType)}
+
+${progress.documents} documents processed…
+${progress.mutations} mutations generated…
+${chalk.blue(progress.pending)} requests pending…
+${chalk.green(progress.completedTransactions.length)} transactions committed.
+
+${mutation && !progress.done ? `» ${chalk.grey(formatMutation(chalk, mutation as Mutation))}` : ''}`
+              })
+            },
+          },
+          migration,
+        ))
+    spinner.stop()
   },
 }
 

packages/sanity/src/_internal/cli/commands/migration/mutationFormatter.ts → packages/sanity/src/_internal/cli/commands/migration/utils/mutationFormatter.ts

@@ -1,20 +1,19 @@
 // An example of a compact formatter
 
 import {Mutation, Index, KeyedPathElement, NodePatch, stringify} from '@bjoerge/mutiny'
-import {SanityDocument} from '@sanity/types'
 import {Chalk} from 'chalk'
 
 export type ItemRef = string | number
 
-export function format<Doc extends SanityDocument>(chalk: Chalk, mutations: Mutation[]): string {
-  return mutations.flatMap((m) => encodeMutation<Doc>(chalk, m)).join('\n')
+export function format(chalk: Chalk, mutations: Mutation[]): string {
+  return mutations.flatMap((m) => formatMutation(chalk, m)).join('\n')
 }
 
 function encodeItemRef(ref: Index | KeyedPathElement): ItemRef {
   return typeof ref === 'number' ? ref : ref._key
 }
 
-function encodeMutation<Doc extends SanityDocument>(chalk: Chalk, mutation: Mutation): string {
+export function formatMutation(chalk: Chalk, mutation: Mutation): string {
   if (
     mutation.type === 'create' ||
     mutation.type === 'createIfNotExists' ||