Introduction

A better way to encode GCS files and expect a callback from it. In this small project, we have created a method which will take the necessary connections and return the callback with each chunk and final content in then block

Implementation

Definition

To use the wrapper method you just need 3 parameters. Following is the details for the parameters

• fileName - a filename or file path for the file which needs to be encoded in the connected BUCKET
• callback - This callback can be used as parallel processing for the outer methods
• encoding [optional] - Set the encoding for the file. Default value is base64

Environment

This project needs 4 environment variable. Refer .env.sample

• GOOGLE_JSON_PATH - put the file in root directory
• BUCKET_NAME
• PROJECT_ID
• FILE_NAME - Customize based on your need

Example

You can find the example in the index.js of this project. To use the method, first one needs to import it inside the file. After importing it,

read
  .readFile(FILE_NAME, (chunk) => {
    // do some processing with the chunk
    console.log(chunk)
  })
  .then((data) => {
      // do some processing with the final output
      console.log(data)
  })
  .catch((e) => console.log({ e }));

Other note

This project uses these dependencies

• @google-cloud/storage - to talk with the storage service
• dotenv is to fetch the env variable
• winston is for maintaining the log

"dependencies": {
    "@google-cloud/storage": "^5.13.1",
    "dotenv": "^10.0.0",
    "winston": "^3.3.3"
  }

This is a minimum example of how you can use this method in your project