Alternative to getting started for Clojure CLR with a socket REPL and sending a SigV4 signed request using an extension method

get_from_s3.clj

(ns get_from_s3
  (:import [Amazon.Runtime EnvironmentVariablesAWSCredentials SessionAWSCredentials]
           [System.Net.Http HttpClient GetAsyncExtensions HttpCompletionOption]
           [System Uri])
  ;(:use clojure.pprint clojure.repl clojure.reflect)
  (:require [clojure.clr.io :as io]))

;(assembly-load "AWSSDK.Core")
;(assembly-load "AwsSignatureVersion4")

(def client (new HttpClient))
(def creds (new EnvironmentVariablesAWSCredentials)) ; or new SessionAWSCredentials(key,secret,token)
(def obj-uri (new Uri "https://batch-jobs-dev.s3.us-east-2.amazonaws.com/manifests/manifest-1716540014.csv.gz"))

(with-open [os (io/output-stream "output.csv.gz")]
  (let [res (.Result (GetAsyncExtensions/GetAsync client obj-uri HttpCompletionOption/ResponseHeadersRead "us-east-2" "s3" creds))]
    (-> res .Content (.CopyToAsync os) .Result)))

hello.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net7.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="AwsSignatureVersion4" Version="4.0.1" />
    <PackageReference Include="Clojure" Version="1.12.0-alpha8" />
  </ItemGroup>

</Project>

Program.cs

// dotnet --version
// 7.0.100
// dotnet restore
// dotnet run
// rlwrap nc localhost 5555

using System;
using System.IO;
using System.Net;
using System.Net.Http;
using System.Reflection;
using System.Threading;
using System.Threading.Tasks;
using System.Collections.Generic;

using clojure.lang;

// based on https://github.com/Dangercoder/potion/blob/master/src/NRepl.cs

var REQUIRE = RT.var("clojure.core", "require");
var LOAD = RT.var("clojure.core", "load");

Console.WriteLine("Loading Clojure then socket REPL");
RT.Init();

string ns;
ns = "clojure.tools.reader.edn";
Assembly.Load("clojure.tools.reader");
REQUIRE.invoke(Symbol.intern(ns));
var fn = RT.var(ns, "read-string");
var p = fn.invoke("{:name \"repl\" :port 5555 :accept clojure.core.server/repl :server-daemon true}");

Console.WriteLine(p.ToString());

ns = "clojure.core.server";
REQUIRE.invoke(Symbol.intern(ns));
RT.var(ns, "start-server").invoke(p);

// https://stackoverflow.com/a/13899429/4305877

var exitEvent = new ManualResetEvent(false);
Console.CancelKeyPress += (sender, eventArgs) => {
                              eventArgs.Cancel = true;
                              exitEvent.Set();
                          };
exitEvent.WaitOne();