@strapi/data-transfer/dist/strapi/remote/handlers/pull.mjs.map

Data transfer capabilities for Strapi

{"version":3,"file":"pull.mjs","sources":["../../../../src/strapi/remote/handlers/pull.ts"],"sourcesContent":["import { Readable } from 'stream';\nimport { randomUUID } from 'crypto';\nimport type { Core } from '@strapi/types';\n\nimport { Handler } from './abstract';\nimport { handlerControllerFactory, isDataTransferMessage } from './utils';\nimport { createLocalStrapiSourceProvider, ILocalStrapiSourceProvider } from '../../providers';\nimport { ProviderTransferError } from '../../../errors/providers';\nimport type { IAsset, TransferStage, Protocol } from '../../../../types';\nimport { Client } from '../../../../types/remote/protocol';\n\nconst TRANSFER_KIND = 'pull';\nconst VALID_TRANSFER_ACTIONS = ['bootstrap', 'close', 'getMetadata', 'getSchemas'] as const;\n\ntype PullTransferAction = (typeof VALID_TRANSFER_ACTIONS)[number];\n\nexport interface PullHandler extends Handler {\n  provider?: ILocalStrapiSourceProvider;\n\n  streams?: { [stage in TransferStage]?: Readable };\n\n  assertValidTransferAction(action: string): asserts action is PullTransferAction;\n\n  onTransferMessage(msg: Protocol.Client.TransferMessage): Promise<unknown> | unknown;\n  onTransferAction(msg: Protocol.Client.Action): Promise<unknown> | unknown;\n  onTransferStep(msg: Protocol.Client.TransferPullMessage): Promise<unknown> | unknown;\n\n  createReadableStreamForStep(step: TransferStage): Promise<void>;\n\n  flush(stage: TransferStage, id: string): Promise<void> | void;\n}\n\nexport const createPullController = handlerControllerFactory<Partial<PullHandler>>((proto) => ({\n  isTransferStarted(this: PullHandler) {\n    return proto.isTransferStarted.call(this) && this.provider !== undefined;\n  },\n\n  verifyAuth(this: PullHandler) {\n    return proto.verifyAuth.call(this, TRANSFER_KIND);\n  },\n\n  cleanup(this: PullHandler) {\n    proto.cleanup.call(this);\n\n    this.streams = {};\n\n    delete this.provider;\n  },\n\n  onInfo(message) {\n    this.diagnostics?.report({\n      details: {\n        message,\n        origin: 'pull-handler',\n        createdAt: new Date(),\n      },\n      kind: 'info',\n    });\n  },\n  onWarning(message) {\n    this.diagnostics?.report({\n      details: {\n        message,\n        createdAt: new Date(),\n        origin: 'pull-handler',\n      },\n      kind: 'warning',\n    });\n  },\n\n  onError(error) {\n    this.diagnostics?.report({\n      details: {\n        message: error.message,\n        error,\n        createdAt: new Date(),\n        name: error.name,\n        severity: 'fatal',\n      },\n      kind: 'error',\n    });\n  },\n\n  assertValidTransferAction(this: PullHandler, action) {\n    // Abstract the constant to string[] to allow looser check on the given action\n    const validActions = VALID_TRANSFER_ACTIONS as unknown as string[];\n\n    if (validActions.includes(action)) {\n      return;\n    }\n\n    throw new ProviderTransferError(`Invalid action provided: \"${action}\"`, {\n      action,\n      validActions: Object.keys(VALID_TRANSFER_ACTIONS),\n    });\n  },\n\n  async onMessage(this: PullHandler, raw) {\n    const msg = JSON.parse(raw.toString());\n\n    if (!isDataTransferMessage(msg)) {\n      return;\n    }\n\n    if (!msg.uuid) {\n      await this.respond(undefined, new Error('Missing uuid in message'));\n    }\n\n    if (proto.hasUUID(msg.uuid)) {\n      const previousResponse = proto.response;\n      if (previousResponse?.uuid === msg.uuid) {\n        await this.respond(previousResponse?.uuid, previousResponse.e, previousResponse.data);\n      }\n      return;\n    }\n\n    const { uuid, type } = msg;\n    proto.addUUID(uuid);\n    // Regular command message (init, end, status)\n    if (type === 'command') {\n      const { command } = msg;\n      this.onInfo(`received command:${command} uuid:${uuid}`);\n      await this.executeAndRespond(uuid, () => {\n        this.assertValidTransferCommand(command);\n\n        // The status command don't have params\n        if (command === 'status') {\n          return this.status();\n        }\n\n        return this[command](msg.params);\n      });\n    }\n\n    // Transfer message (the transfer must be init first)\n    else if (type === 'transfer') {\n      this.onInfo(`received transfer action:${msg.action} step:${msg.kind} uuid:${uuid}`);\n      await this.executeAndRespond(uuid, async () => {\n        await this.verifyAuth();\n\n        this.assertValidTransfer();\n\n        return this.onTransferMessage(msg);\n      });\n    }\n\n    // Invalid messages\n    else {\n      await this.respond(uuid, new Error('Bad Request'));\n    }\n  },\n\n  async onTransferMessage(this: PullHandler, msg) {\n    const { kind } = msg;\n\n    if (kind === 'action') {\n      return this.onTransferAction(msg);\n    }\n\n    if (kind === 'step') {\n      return this.onTransferStep(msg as Protocol.Client.TransferPullMessage);\n    }\n  },\n\n  async onTransferAction(this: PullHandler, msg) {\n    const { action } = msg;\n\n    this.assertValidTransferAction(action);\n\n    if (action === 'bootstrap') {\n      return this.provider?.[action](this.diagnostics);\n    }\n    return this.provider?.[action]();\n  },\n\n  async flush(this: PullHandler, stage: Client.TransferPullStep, id) {\n    type Stage = typeof stage;\n    const batchSize = 1024 * 1024;\n    let batch = [] as Client.GetTransferPullStreamData<Stage>;\n    const stream = this.streams?.[stage];\n\n    const batchLength = () => Buffer.byteLength(JSON.stringify(batch));\n\n    const maybeConfirm = async (data: any) => {\n      try {\n        await this.confirm(data);\n      } catch (error) {\n        // Handle the error, log it, or take other appropriate actions\n\n        strapi?.log.error(\n          `[Data transfer] Message confirmation failed: ${(error as Error)?.message}`\n        );\n        this.onError(error as Error);\n      }\n    };\n\n    const sendBatch = async () => {\n      await this.confirm({\n        type: 'transfer',\n        data: batch,\n        ended: false,\n        error: null,\n        id,\n      });\n      batch = [];\n    };\n\n    if (!stream) {\n      throw new ProviderTransferError(`No available stream found for ${stage}`);\n    }\n\n    try {\n      for await (const chunk of stream) {\n        if (stage !== 'assets') {\n          batch.push(chunk);\n          if (batchLength() >= batchSize) {\n            await sendBatch();\n          }\n        } else {\n          await this.confirm({\n            type: 'transfer',\n            data: [chunk],\n            ended: false,\n            error: null,\n            id,\n          });\n        }\n      }\n\n      if (batch.length > 0 && stage !== 'assets') {\n        await sendBatch();\n      }\n      await this.confirm({ type: 'transfer', data: null, ended: true, error: null, id });\n    } catch (e) {\n      // TODO: if this confirm fails, can we abort the whole transfer?\n      await maybeConfirm({ type: 'transfer', data: null, ended: true, error: e, id });\n    }\n  },\n\n  async onTransferStep(this: PullHandler, msg) {\n    const { step, action } = msg;\n\n    if (action === 'start') {\n      if (this.streams?.[step] instanceof Readable) {\n        throw new Error('Stream already created, something went wrong');\n      }\n\n      const flushUUID = randomUUID();\n\n      await this.createReadableStreamForStep(step);\n      this.flush(step, flushUUID);\n\n      return { ok: true, id: flushUUID };\n    }\n\n    if (action === 'end') {\n      const stream = this.streams?.[step];\n\n      if (stream?.readableEnded === false) {\n        await new Promise((resolve) => {\n          stream?.on('close', resolve).destroy();\n        });\n      }\n\n      delete this.streams?.[step];\n\n      return { ok: true };\n    }\n  },\n\n  async createReadableStreamForStep(this: PullHandler, step: Exclude<TransferStage, 'schemas'>) {\n    const mapper = {\n      entities: () => this.provider?.createEntitiesReadStream(),\n      links: () => this.provider?.createLinksReadStream(),\n      configuration: () => this.provider?.createConfigurationReadStream(),\n      assets: () => {\n        const assets = this.provider?.createAssetsReadStream();\n        let batch: Protocol.Client.TransferAssetFlow[] = [];\n\n        const batchLength = () => {\n          return batch.reduce(\n            (acc, chunk) => (chunk.action === 'stream' ? acc + chunk.data.byteLength : acc),\n            0\n          );\n        };\n\n        const BATCH_MAX_SIZE = 1024 * 1024; // 1MB\n\n        if (!assets) {\n          throw new Error('Assets read stream could not be created');\n        }\n        /**\n         * Generates batches of 1MB of data from the assets stream to avoid\n         * sending too many small chunks\n         *\n         * @param stream Assets stream from the local source provider\n         */\n        async function* generator(stream: Readable) {\n          let hasStarted = false;\n          let assetID = '';\n\n          for await (const chunk of stream) {\n            const { stream: assetStream, ...assetData } = chunk as IAsset;\n            if (!hasStarted) {\n              assetID = randomUUID();\n              // Start the transfer of a new asset\n              batch.push({ action: 'start', assetID, data: assetData });\n              hasStarted = true;\n            }\n\n            for await (const assetChunk of assetStream) {\n              // Add the asset data to the batch\n              batch.push({ action: 'stream', assetID, data: assetChunk });\n\n              // if the batch size is bigger than BATCH_MAX_SIZE stream the batch\n              if (batchLength() >= BATCH_MAX_SIZE) {\n                yield batch;\n                batch = [];\n              }\n            }\n\n            // All the asset data has been streamed and gets ready for the next one\n            hasStarted = false;\n            batch.push({ action: 'end', assetID });\n            yield batch;\n            batch = [];\n          }\n        }\n\n        return Readable.from(generator(assets));\n      },\n    };\n\n    if (!(step in mapper)) {\n      throw new Error('Invalid transfer step, impossible to create a stream');\n    }\n\n    if (!this.streams) {\n      throw new Error('Invalid transfer state');\n    }\n\n    this.streams[step] = await mapper[step]();\n  },\n\n  // Commands\n  async init(this: PullHandler) {\n    if (this.transferID || this.provider) {\n      throw new Error('Transfer already in progress');\n    }\n    await this.verifyAuth();\n\n    this.transferID = randomUUID();\n    this.startedAt = Date.now();\n\n    this.streams = {};\n\n    this.provider = createLocalStrapiSourceProvider({\n      autoDestroy: false,\n      getStrapi: () => strapi as Core.Strapi,\n    });\n\n    return { transferID: this.transferID };\n  },\n\n  async end(\n    this: PullHandler,\n    params: Protocol.Client.GetCommandParams<'end'>\n  ): Promise<Protocol.Server.Payload<Protocol.Server.EndMessage>> {\n    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