Merge pull request #6 from perun-network/horizon_update_v2.27.0

Switch to Horizon v2.27.0 update version of the stellar/go repository

.gitignore

@@ -13,3 +13,6 @@
 
 # Dependency directories (remove the comment below to include it)
 # vendor/
+
+settings.json
+launch.json

Dockerfile

@@ -0,0 +1,18 @@
+# Based on Preview 7
+# https://soroban.stellar.org/docs/reference/releases
+
+FROM ubuntu:20.04
+
+RUN apt update && apt install -y curl
+
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs > rust_install.sh
+RUN sh rust_install.sh -y
+RUN echo $PATH
+ENV PATH="$PATH:/root/.cargo/bin"
+RUN rustup target add wasm32-unknown-unknown
+
+RUN apt install -y build-essential
+# WORKDIR /
+RUN mkdir /workspace
+WORKDIR /workspace
+ENV IS_USING_DOCKER=true

LICENSE

@@ -0,0 +1,202 @@
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README.md

@@ -0,0 +1,65 @@
+<h1 align="center">
+    <a href="https://perun.network/"><img src=".assets/go-perun.png" alt="Perun" width="30%"></a>
+</h1>
+
+
+# [Perun](https://perun.network/) Stellar backend
+
+This repository contains the [Stellar](https://stellar.org/) backend for the [go-perun](https://github.com/perun-network/go-perun) channel library. It provides the necessary components to run our secure peer-to-peer Perun Payment Channels on the Stellar blockchain, using a [Soroban](https://soroban.stellar.org/) smart contract implementation. The payment channel implementation connects our Perun state machine with the [Perun contract](https://github.com/perun-network/perun-soroban-contract), which implements the Perun Payment Channel logic on the Stellar blockchain. To connect to the Stellar blockchain, we use the Horizon client service of the Stellar Go SDK, which is located [here](https://github.com/stellar/go). 
+
+This project is financed through the Stellar Community Fund grants program.
+
+In the following sections, we will describe how to run our Payment Channels on a local instance of the Stellar blockchain.
+
+## [Setup](#setup)
+
+1. Clone this repository:
+
+```
+git clone https://github.com/perun-network/perun-stellar-backend
+cd perun-stellar-backend
+```
+
+2. Running the payment channel unit tests:
+
+To run the unit tests only, you can use the following command:
+
+```sh
+
+go test ./...
+```
+
+3. Running the payment channel tests, including the integration tests:
+
+The integration tests require running a local Stellar blockchain, a Horizon client and a Soroban RPC server. The binaries are packaged in a docker image.
+
+To install the docker image, you need to download and build it first, using the build.sh script in testdata/docker:
+
+```sh
+./testdata/docker/build.sh
+```
+
+Now you can run the docker image with
+
+```sh
+./quickstart.sh standalone
+
+```
+
+The initialization takes a few seconds. Afterwards, you can run the tests using the following command:
+
+```sh
+
+go test -tags=integration ./...
+```
+
+Note that this backend is customized to run on a local Stellar blockchain (standalone), but can be easily adapted to run on a public blockchain.
+
+
+# Payment Channel Demo
+
+A demonstrator of Perun payment channels on the Stellar blockchain can be found [here](https://github.com/perun-network/perun-stellar-demo).
+
+# Copyright
+
+Copyright 2024 PolyCrypt GmbH. Use of the source code is governed by the Apache 2.0 license that can be found in the [LICENSE file](LICENSE).