DescribeVpcEndpointConnections is returning empty reponse

[gowrisankar22]

Hello All,

I am trying to use the DescribeVpcEndpointConnections[1][2] to list all the available vpc endpoints but it is not returning the values. Looks like an issue?

but aws cli is working fine using aws ec2 describe-vpc-endpoints

Response:

VPC endpoint: Details:
{
	"NextToken": null,
	"VpcEndpointConnections": [],
	"ResultMetadata": {}
}

DescribeVpcEndpointConnections

package main

import (
	"context"
	"encoding/json"
	"fmt"

	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/ec2"
)

func main() {
	cfg, err := config.LoadDefaultConfig(context.TODO(),
		config.WithRegion("eu-central-1"),
	)
	if err != nil {
		panic(fmt.Sprintf("failed loading config, %v", err))
	}

	client := ec2.NewFromConfig(cfg)

	input := &ec2.DescribeVpcEndpointConnectionsInput{}

	resp, err := client.DescribeVpcEndpointConnections(context.Background(), input)

	if err != nil {
		fmt.Println("Got an error retrieving information about your VPC endpoint:")
		fmt.Println(err)
		return
	}

	fmt.Println("VPC endpoint: Details:")
	respDecrypted, _ := json.MarshalIndent(resp, "", "\t")
	fmt.Println(string(respDecrypted))
}

[1] https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/ec2#DescribeVpcEndpointConnectionsInput
[2] https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/ec2#DescribeVpcEndpointConnections

[jasdel]

Thanks for reporting this issue @gowrisankar22 I think this is related to the fix in #992 . The SDK was incorrectly deserializing XML document responses.

[gowrisankar22]

@jasdel what is the tentative timeline for the next release with this fix? our development blocked due to this issue ?

[gowrisankar22]

@jasdel @skmcgrail I have tried with v0.31 but still, the issue not yet fixed.

the same was working fine with version v0.29

[skmcgrail]

I am not able to replicate this behavior on v0.31.0. I created a VPC Endpoint Service in the console, attached the endpoint to a VPC and was able to use the code you provided to get a response from the service describing the endpoint connections.

Can you please enable response logging following the logging guide to confirm that you are getting an expected response from the service?

[gowrisankar22]

@skmcgrail I have added the logger but I don't see any logs but it looks strange for me ..

I am using go version go1.15.6 darwin/amd64.

var applicationLogger logging.Logger
cfg, err := config.LoadDefaultConfig(context.TODO(), config.WithLogger(applicationLogger))

[skmcgrail]

You will also need to pass config.WithClientLogMode(aws.LogResponseWithBody) to LoadDefaultConfig to enable the logging of the response body.

[gowrisankar22]

@skmcgrail
I have received the below response. I didn't find any event in the cloud trail as well.

SDK 2020/12/25 08:20:58 DEBUG Response
HTTP/1.1 200 OK
Transfer-Encoding: chunked
Cache-Control: no-cache, no-store
Content-Type: text/xml;charset=UTF-8
Date: Fri, 25 Dec 2020 02:50:58 GMT
Server: AmazonEC2
Strict-Transport-Security: max-age=31536000; includeSubDomains
Vary: accept-encoding
X-Amzn-Requestid: 889ec0b3-197f-4aff-8a62-8a7e9332e1f6

10a
<?xml version="1.0" encoding="UTF-8"?>
<DescribeVpcEndpointConnectionsResponse xmlns="http://ec2.amazonaws.com/doc/2016-11-15/">
    <requestId>889ec0b3-197f-4aff-8a62-8a7e9332e1f6</requestId>
    <vpcEndpointConnectionSet/>
</DescribeVpcEndpointConnectionsResponse>
0

VPC endpoint: Details:
{
	"NextToken": null,
	"VpcEndpointConnections": [],
	"ResultMetadata": {}
}

[skmcgrail]

As indicated by the output of the raw HTTP response, the service is returning you no items as indicated by <vpcEndpointConnectionSet/>. Please confirm that you are using the correct API, from my testing and understanding, this API only returns connections details to VPC Endpoints (AWS PrivateLink) for services hosted by you in your account, or another AWS customer account. This API does not include details for PrivateLink connections provided by AWS services like EC2 or DynamoDB. See the AWS PrivateLink and VPC endpoints user guide.

[gowrisankar22]

@skmcgrail thanks :) It was my mistake. I got the right api and it is working now :)
https://github.com/aws/aws-sdk-go-v2/blob/service/ec2/v0.31.0/service/ec2/api_op_DescribeVpcEndpoints.go#L32

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