Need to read the content of text file which is uploaded in the aws S3 bucket. I have the url for the file located in S3 bucket. Could someone please help me to read the text file content using the S3 Url.

I know we can read the Data using ResponseStream but would like to read it using the Url / Path. Need to create AWS lambda using .net core. Below code highlights how to read it using responsestream

using (GetObjectResponse response = await _client.GetObjectAsync(requestGet))
using (Stream responseStream = response.ResponseStream)
using (StreamReader reader = new StreamReader(responseStream))

1 Answers

1
Krunal Barot On

AWS .Net SDK is the answer for your question:

-Execute the getObject method by providing bucket name and object key in the request.

-Execute one of the GetObjectResponse methods to process the stream.

Below is the sample for the same from AWS link:

´╗┐using Amazon.S3;
using Amazon.S3.Model;
using System;
using System.IO;
using System.Threading.Tasks;

namespace Amazon.DocSamples.S3
{
    class GetObjectTest
    {
        private const string bucketName = "*** bucket name ***";
        private const string keyName = "*** object key ***";
        // Specify your bucket region (an example region is shown).
        private static readonly RegionEndpoint bucketRegion = RegionEndpoint.USWest2;
        private static IAmazonS3 client;

        public static void Main()
        {
            client = new AmazonS3Client(bucketRegion);
            ReadObjectDataAsync().Wait();
        }

        static async Task ReadObjectDataAsync()
        {
            string responseBody = "";
            try
            {
                GetObjectRequest request = new GetObjectRequest
                {
                    BucketName = bucketName,
                    Key = keyName
                };
                using (GetObjectResponse response = await client.GetObjectAsync(request))
                using (Stream responseStream = response.ResponseStream)
                using (StreamReader reader = new StreamReader(responseStream))
                {
                    string title = response.Metadata["x-amz-meta-title"]; // Assume you have "title" as medata added to the object.
                    string contentType = response.Headers["Content-Type"];
                    Console.WriteLine("Object metadata, Title: {0}", title);
                    Console.WriteLine("Content type: {0}", contentType);

                    responseBody = reader.ReadToEnd(); // Now you process the response body.
                }
            }
            catch (AmazonS3Exception e)
            {
                Console.WriteLine("Error encountered ***. Message:'{0}' when writing an object", e.Message);
            }
            catch (Exception e)
            {
                Console.WriteLine("Unknown encountered on server. Message:'{0}' when writing an object", e.Message);
            }
        }
    }
}