This is the source code repository for Pact, a language for developing smart contracts to run on a fast deterministic blockchain.
The easiest way to try Pact is in the browser.
To start writing
smart contracts, the best way to go is to use the Atom editor and install
language-pact
using the package manager.
You'll then need to install the Pact interpreter/REPL. On Mac, the easiest way to install pact
is with Homebrew.
Make sure that Homebrew has been installed in your machine. Instructions for how to install it can be found here.
Once Homebrew is installed, run the following command to install pact
:
brew install kadena-io/pact/pact
Pact can also be installed by following the instructions below:
- Install z3.
- Download the prebuilt binaries for your distribution. Or see Building for instructions on how to build Pact from the source code.
- Once you've downloaded the binary, make sure that it is marked as executable by running
chmod +x <executable-file>
. - Put the binary somewhere in your PATH.
For installing pact
on Linux distributions in the Arch family, refer to this package on the AUR.
Test by issuing pact
in a terminal. Try out some commands:
$ pact
pact> (+ 1 2)
3
pact> (+ "hello, " "world")
"hello, world"
There are examples in this source repository of working smart contracts which you can load into Atom to get started.
Pact now features a full REST API HTTP server and SQLite database implementation, making blockchain application development painless and easy. The Pact server simulates a single-node blockchain environment, with the same API supported by the Kadena ScalableBFT blockchain.
To start the server, issue pact --serve CONFIG
or pact -s CONFIG
, where CONFIG is a valid config.yaml.
The REST API is documented at http://pact-language.readthedocs.io/en/latest/pact-reference.html#rest-api.
-
The pact-lang-api npm package provides a JavaScript library to aid interaction with the API.
-
The pact-todomvc is a working demonstration.
The HTTP server will host any static files it finds in its working directory.
The pact dev server (pact-serve) requires a configuration Yaml file (e.g. server.conf) to operate. The documentation for it is:
โ 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
When running pact-serve with persistence enabled, the server automatically replays from the database
commands.sqlite
in the persist dir. To prevent replay, simply delete this file before starting the server.
Issue stack build
on the command line.
Use stack install
to install on the command line and for Atom, ensuring that $HOME/.local/bin
is on your PATH.
The fastest way to build and run pact is to use the Nix package manager which has binary caching capabilities that allow you to download pre-built binaries for everything needed by pact. For detailed instructions see our wiki.
When the build is finished, you can run pact with the following command:
./result/ghc/pact/bin/pact
Building with nix-build
does a full rebuild every time, which is usually not
what you want when developing. To do incremental builds, you need to enter a nix
shell. To do that use the nix-shell
command.
This puts you in a shell that has all the necessary dependencies installed. Once
inside this shell you can build as normal with cabal using cabal build
or
cabal new-build
.
You can also build with stack inside this shell as follows:
$ stack --stack-yaml stack-nix.yaml build
Nix has out-of-the-box Hoogle integration. It allows you to run a local Hoogle server with docs for all of the project dependencies. This is really nice for two reasons:
-
You know you're getting correct docs for the exact versions of the packages you are depending on.
-
You don't have to have an internet connection to access them.
To start the hoogle server, run this command from the project root directory.
nix-shell --run 'hoogle server --local'
This runs hoogle locally on port 8080. Running it this way, however, does not include haddocks for the pact (or whatever tho local project is). It only includes docs for the dependencies. To fix this, use the following command instead:
nix-shell -p 'with import ./. {}; ghc.ghcWithHoogle (p: [p.pact])' --run 'hoogle server --local'
To use the above command for other projects that use the .project
function
replace [p.pact]
with a list of all the locally defined projects to include.
For example: [p.backend p.common p.frontend]
for a project that has those
three separate local packages.
This code is distributed under the terms of the BSD3 license. See LICENSE for details.