Networking issue when using all libraries provided by ldd command about swift-lambda-app HOT 5 OPEN

Thanks – will have a look

from swift-lambda-app.

Possibly AWS Lambda image has changed but talking 6 months back, I was doing network calls used the carried over libcurl and didn't face any issues with DNS resolving.

Is the issue reproducible on other DNS addresses? Can you supply a sample code please?

from swift-lambda-app.

This is the code from main.swift:

import Foundation
import Dispatch

let request = URLRequest(url: URL(string: "https://raw.githubusercontent.com/nikola-mladenovic/AwsSwiftSign/master/README.md")!)
let session = URLSession(configuration: .default)
let semaphore = DispatchSemaphore(value: 0)
session.dataTask(with: request, completionHandler: { data, response, error in
    if let statusCode = (response as? HTTPURLResponse)?.statusCode {
        print("status code: \(statusCode)")
    }
    if let error = error {
        print("error code: \(error._code)")
        print("error domain: \(error._domain)")
        print("error desc: \(error.localizedDescription)")
    }
    if let data = data {
        print(String(data: data, encoding: .utf8)!)
    }
    semaphore.signal()
}).resume()
_ = semaphore.wait(timeout: DispatchTime.distantFuture)

I tried to avoid AWS URLs for this example.

Using ibmcom/swift-ubuntu:3.1.1 docker image for compilation and libraries cp.

To make this a bit easier to test, here're the two zip files, one with libcurl.so.4 included, and the second one without.

libcurl.so.4 included:
lambda_w_libcurl.zip

libcurl.so.4 not included:
lambda_w_o_libcurl.zip

Another useful information is that removing libcurl.so.4 works if you compiled using ubuntu 14.04. However if you try compiling using Swift for ubuntu 16.04 and cping those libraries, removing libcurl.so.4 won't do the trick - the networking still won't work.

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Hi , I Have the same problem, did anyone find a solution ?

from swift-lambda-app.

You now also have to exclude libresolv.so.2 (along with libcurl.so.4) in order for networking to work.

from swift-lambda-app.