Prisma•2mo ago

Question about interactive transactions

I'm reading the docs about interactive transactions and it mentionts to try to not do network requests inside of them. I am trying to create an entry in a playlist table which has a url to a thumbnail. I was going to name the thumbnail using a trigger so the file name can contain playlist Id. The actual thumbnail image is uploaded to S3 after getting the playlist id to name it. I don't want the entry in the database to be created if the image upload fails. Is there a better way to go about this if interactive transactions doc says this is a bad idea?

2 Replies

RaphaelEtim•2mo ago

Hi @SimplyEmu 👋 One way to go about this is to: 1. Perform the S3 upload operation before any database transaction. This ensures that the network request is completed successfully before proceeding with database operations. 2. Use a Transaction to Create the Playlist Entry: Once the image is successfully uploaded, start a transaction to create the playlist entry and update it with the thumbnail URL. for example:

const AWS = require('aws-sdk');
const s3 = new AWS.S3();

async function uploadThumbnailToS3(file, playlistId) {
  const params = {
    Bucket: 'your-bucket-name',
    Key: `thumbnails/${playlistId}.jpg`,
    Body: file,
    ContentType: 'image/jpeg'
  };

  return s3.upload(params).promise();
}

async function createPlaylistWithThumbnail(prisma, file) {
  try {
    // Step 1: Create a new playlist entry to get the playlist ID
    const newPlaylist = await prisma.playlist.create({
      data: {
        // your playlist data
      }
    });

    const playlistId = newPlaylist.id;

    // Step 2: Upload the thumbnail to S3
    await uploadThumbnailToS3(file, playlistId);

    // Step 3: Start the transaction to update the playlist entry with the thumbnail URL
    await prisma.$transaction(async (tx) => {
      await tx.playlist.update({
        where: { id: playlistId },
        data: {
          thumbnailUrl: `https://your-bucket-name.s3.amazonaws.com/thumbnails/${playlistId}.jpg`
        }
      });
    });

  } catch (error) {
    // Handle the error 
    console.error('Failed to upload thumbnail or update playlist:', error);
    throw error; // Rethrow the error to ensure the transaction is rolled back
  }
}

const AWS = require('aws-sdk');
const s3 = new AWS.S3();

async function uploadThumbnailToS3(file, playlistId) {
  const params = {
    Bucket: 'your-bucket-name',
    Key: `thumbnails/${playlistId}.jpg`,
    Body: file,
    ContentType: 'image/jpeg'
  };

  return s3.upload(params).promise();
}

async function createPlaylistWithThumbnail(prisma, file) {
  try {
    // Step 1: Create a new playlist entry to get the playlist ID
    const newPlaylist = await prisma.playlist.create({
      data: {
        // your playlist data
      }
    });

    const playlistId = newPlaylist.id;

    // Step 2: Upload the thumbnail to S3
    await uploadThumbnailToS3(file, playlistId);

    // Step 3: Start the transaction to update the playlist entry with the thumbnail URL
    await prisma.$transaction(async (tx) => {
      await tx.playlist.update({
        where: { id: playlistId },
        data: {
          thumbnailUrl: `https://your-bucket-name.s3.amazonaws.com/thumbnails/${playlistId}.jpg`
        }
      });
    });

  } catch (error) {
    // Handle the error 
    console.error('Failed to upload thumbnail or update playlist:', error);
    throw error; // Rethrow the error to ensure the transaction is rolled back
  }
}

SimplyEmuOP•2mo ago

I think I just need to come up with a different file naming scheme. I’m trying to prevent creating the playlist if the file upload fails. Probably a horrible way to go about it but it is what it is i guess.

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Question about interactive transactions