Store temp file in .net lambda and then publish to s3Bucket

Question

I am generating a .csv file for further storing in a s3 bucket using .net c# Lambda function.

This is the process i follow:

1. Generate the .csv and store it in /tmp/ folder of the lambda function execution. In this step im not sure if it is really saving the file in that path.

       //filepath = @"/tmp/test.csv"
       try
       {
           using (System.IO.StreamWriter file = new System.IO.StreamWriter(@filepath, true))
           {
   
               file.WriteLine(ID + "," + workItemType + "," + title + "," + assignedTo + "," + state + "," + iterationPath);                    
               Console.WriteLine("Successfully added");
           }
       }
       catch (Exception ex)
       {
           throw new ApplicationException(" somethings wrong: ", ex);
       }
   

2. Upload the file to s3 bucket.

       try
       {
           await client.PutObjectAsync(new Amazon.S3.Model.PutObjectRequest
           {
               BucketName = "mys3bucket",
               Key = "test.csv",
               ContentType = @"/tmp/test.csv"
           });
       await Task.CompletedTask;
       }
       catch (Exception ex)
       {
           Console.WriteLine("Exception in PutS3Object:" + ex.Message);                ;
       }
   

In this last step i get this error message:

Exception in PutS3Object:The format of value '\tmp\test.csv' is invalid.

What i am doing wrong?

Answer 1

You need to send the data to include in the csv file:

    await client.PutObjectAsync(new Amazon.S3.Model.PutObjectRequest
    {
        BucketName = "mys3bucket",
        Key = "test.csv",
        ContentBody = DATAINSTRINGFORMAT,
        ContentType = @"text/csv"
    });

or as filepath to send:

    await client.PutObjectAsync(new Amazon.S3.Model.PutObjectRequest
    {
        BucketName = "mys3bucket",
        Key = "test.csv",
        FilePath = FILEPATHONYOURTEMPFOLDER,
        ContentType = @"text/csv"
    });