Transaction Proxy

The Transaction Proxy aims to abstract away smart contract interactions to help simplify business logic. It facilitates:

• Transaction Payload Creation (Given: Contract Name, Method Name, Arguments)
• Signed Transaction Submission
• Smart Contract Data Viewing

Using the library

The Transaction Proxy code is packaged as a library which can be consumed as an npm library.
Included in this repository is an implementation of the library, exposed as a Web API using Azure Functions for Docker.

Example Usage

Using the library in your own code may look like:

import { AzureBlobContractSource, ContractRepository, TransactionProxy } from "eth-transaction-proxy";

const contractRepository = new ContractRepository([
  new AzureBlobContractSource("connection-string", "container")
]);
const proxy = new TransactionProxy(contractRepostiory, "rpc_endpoint")

// Call a smart contract view method
let result = await proxy.view({
  from: "0xsender",
  to: "0xcontract_address",
  contractName: "myContract",
  method: "viewMethod",
  arguments: null
});

// Create a transaction payload to call a smart contract method
let payload = await proxy.create({
  from: "0xsender",
  to: "0xcontract_address",
  contractName: "myContract",
  method: "contractMethod",
  arguments: null
});

An example implementation of the Transaction Proxy, exposed through a Web API using Azure Functions is included in the implementation/functions folder of the repository.

Project Structure

• src: Transaction Proxy library source code
• test: Code modules to test the different features of the Transaction Proxy library
• test-docker: Dockerfile and compose for running tests inside a docker container.
• implementation: Example implementations of the Transaction Proxy exposed as a Web API using Azure Functions.
• bin: Build artifacts output (This will be generated on build)

Pre-Build Steps

Prerequisities

For best results use NodeJS 10.15.0 or above.

node-gyp must be installed and working on your machine.
For information on how to install node-gyp see here: https://github.com/nodejs/node-gyp

Windows

Windows users may have to run: npm install --global --production windows-build-tools (this takes a few minutes)

Build the Library

Run the commands

npm install
npm run build

The Transaction Proxy library will build and output into the bin/eth-transaction-proxy/ directory.

Testing

Consult TESTING.md for more information.
Run the commands:

npm run install-test
npm run build-test
npm run test