S3 normal upload

[harryadel]

First, thank you for this awesome package, it saved us lots of effort implementing S3 in reaction-files.

Multipart upload is great for large uploads but not so much for small files so for anyone looking for how to implement normal upload it here's the code:

async _getWriteStream(fileKey, options = {}) {
    const opts = {
      Bucket: Meteor.settings.s3.bucket,
      Key: `${Date.now()}-${fileKey.filename}`
    };

    debug("S3Store _getWriteStream opts:", opts);
    debug("S3Store _getWriteStream options:", options);
    debug("S3Store _getWriteStream fileKey:", fileKey);
    debug("S3Store _getWriteStream objectACL", this.objectACL);

    let writeStream;

    let totalFileSize = 0;
    let chunks = [];
    writeStream = new Writable({
      write: async (chunk, encoding, callback) => {
        totalFileSize += chunk.length;
        chunks.push(chunk);

        callback();
      }
    });

    writeStream.on("finish", async () => {

      debug("S3Store writeStream finish");
      let uploadedFile = await this.s3.upload({
        ...opts,
        Body: Buffer.concat(chunks),
      }).promise();

      debug("S3 multipart upload completed", uploadedFile);
      // Emit end and return the fileKey, size, and updated date
      writeStream.emit("stored", {
        // Set the generated _id so that we know it for future reads and writes.
        // We store the _id as a string and only convert to ObjectID right before
        // reading, writing, or deleting.
        fileKey: uploadedFile.Key,
        storedAt: new Date(),
        size: totalFileSize
      });
    });

    return writeStream;
  }

[ghost]

Thanks @harryadel that'll def come in handy in the future! Mind highlighting your code for us with a by adding js after the first three backticks?