Append data to an S3 object

Question

Let\'s say that I have a machine that I want to be able to write to a certain log file stored on an S3 bucket.

So, the machine needs to have writing abilities to tha

Answer 1

I had the similar issue and this is what I had asked

how to Append data in file using AWS Lambda

Here's What I come up with to solve the above problem:

Use getObject to retrive from the existing file

   s3.getObject(getParams, function(err, data) {
   if (err) console.log(err, err.stack); // an error occurred
   else{
       console.log(data);           // successful response
       var s3Projects = JSON.parse(data.Body);
       console.log('s3 data==>', s3Projects);
       if(s3Projects.length > 0) {
           projects = s3Projects;
       }   
   }
   projects.push(event);
   writeToS3(); // Calling function to append the data
});

Write function to append in the file

   function writeToS3() {
    var putParams = {
      Body: JSON.stringify(projects),
      Bucket: bucketPath, 
      Key: "projects.json",
      ACL: "public-read"
     };

    s3.putObject(putParams, function(err, data) {
       if (err) console.log(err, err.stack); // an error occurred
       else     console.log(data);           // successful response
        callback(null, 'Hello from Lambda');
     });
}

Hope this help!!