Skip to content
Demo of integrating a JS webapp with the Pact smart contract langauge
JavaScript CSS HTML Shell
Branch: master
Clone or download
ggobugi27 Fix dependencies (#15)
* ran npm audit fix

* removed node_modules folder
Latest commit 285c4e0 Aug 20, 2019
Permalink
Type Name Latest commit message Commit time
Failed to load latest commit information.
pact Change app structure with create-react-app (#13) Jun 20, 2019
public
src
.gitignore
README.md
initialize-todos.sh Change app structure with create-react-app (#13) Jun 20, 2019
load-todos.yaml
package-lock.json
package.json Change app structure with create-react-app (#13) Jun 20, 2019
server.conf
todos-pact.png Add files via upload Jul 10, 2019
yarn.lock

README.md

Pact Smart Contract Language TodoMVC demo

Setup

  • Install Pact >= 3.0.0
    • brew install kadena-io/pact/pact
  • Install Node >= 8.11.4
  • Install All Dependencies. The dependencies include Pact Lang API.
    • npm install
  • Navigate into pact-todomvc and create a log folder in the top-level folder mkdir log

Scripts

npm run start:pact: Start the Pact Server

npm run pact:seed: Seed the blockchain

npm start: Start the Web Application

Starting the Project

  1. npm run start:pact
  2. npm run pact:seed
  3. npm start
  4. http://localhost:3000

Using the Pact Dev Server

Configuration File

The pact dev server (pact-serve) requires a configuration Yaml file (e.g. server.conf) to operate. The documentation for it is:

➜  pact git:(feat/dev-server) pact --serve --help
Config file is YAML format with the following properties:
port       - HTTP server port
persistDir - Directory for database files.
             If ommitted, runs in-memory only.
logDir     - Directory for HTTP logs
pragmas    - SQLite pragmas to use with persistence DBs
verbose    - [True|False] Provide extra logging information

Initializing the server

When running pact-serve with persistence enabled the development server will automatically replay from disk when it starts. In this demo, we are persisting to log/ which causes pact-serve to create or use log/commands.sqlite to store Commands and CommandResults.

The first time you run pact-serve the SQLite DBs will be created empty (as no commands have been run yet). To upload todos.pact, which the front end needs loaded to interact with, you run initialize-todos.sh. The important thing to note is that until you delete log/commands.sqlite (or run pact-serve in memory) pact-serve will replay every command (e.g. load todos.pact -> UI interactions) on start up.

If you think of it like a blockchain, deleting the commands.sqlite file or running in memory gives Pact a "fresh" chain to work with.

Credit

The front-end of this app was built on React TodoMVC example.

You can’t perform that action at this time.