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Implementation of a https://polkadot.network node in Rust.
In 2017 we split our implementation of "Polkadot" from its platform-level component "Substrate". When we split them, we split the Polkadot code off into another repo (this repo), leaving the link:https://github.com/paritytech/substrate[**Substrate** repo] to be what used to be Polkadot, along with its branches and releases.
We are actively building both Substrate and Polkadot, but things will be a little odd for a while. If you see "substrate" and are wondering why you need it for Polkadot, now you know.
To play on the ("Alexander") testnet, you'll want the PoC-4 code which is in this **Polkadot** repo. Note that PoC-3 uses the Alexander testnet, but will not be able to sync to the latest block.
* **Polkadot PoC-4 "Alexander"** is in this link:https://github.com/paritytech/polkadot/tree/v0.4[**Polkadot**]repo branch `v0.4`
* **Polkadot PoC-3 "Alexander"** is in this link:https://github.com/paritytech/polkadot/tree/v0.3[**Polkadot**]repo branch `v0.3`
* **Polkadot PoC-2 "Krumme Lanke"** is in the link:https://github.com/paritytech/substrate/tree/v0.2[**Substrate**] repo branch `v0.2`
If you'd like to play with Polkadot, you'll need to install a client like this
one. First, get Rust (1.32.0 or later) and the support software if you don't already have it:
[source, shell]
----
curl https://sh.rustup.rs -sSf | sh
sudo apt install make clang pkg-config libssl-dev
----
If you already have Rust installed, make sure you're using the latest version by running:
[source, shell]
----
rustup update
----
=== Install PoC-4 on "Alexander" Testnet
Build Polkadot PoC-4 by cloning this repository and running the following commands from the root directory of the repo:
```bash
git checkout v0.4
./scripts/init.sh
./scripts/build.sh
cargo build --release
```
If you were previously running PoC-3 on this testnet, you may need to purge your chain data first:
```bash
./target/release/polkadot purge-chain
```
Finally, connect to the global "Alexander" testnet by default by running:
```bash
./target/release/polkadot
```
=== Install PoC-3 "Alexander" Testnet
_Note: Connecting to the current Alexander testnet with this version will not allow synchronization._
Install Polkadot PoC-3 and have a `polkadot` binary installed to your `PATH` with:
cargo install --git https://github.com/paritytech/polkadot.git --branch v0.3 polkadot
Connect to the global "Alexander" testnet by default by running:
=== Install PoC-2 "Krumme Lanke" Testnet
Install Polkadot PoC-2 and have a `polkadot` binary installed to your `PATH` with:
cargo install --git https://github.com/paritytech/substrate.git --branch v0.2 polkadot
Connect to the global "Krumme Lanke" testnet by default by running:
=== Install a custom Testnet version
You can run the following to get the very latest version of Polkadot, but these instructions will not work in that case.
cargo install --git https://github.com/paritytech/polkadot.git polkadot
If you want a specific version of Polkadot, say `0.2.5`, you may run
[source, shell]
cargo install --git https://github.com/paritytech/substrate.git --tag v0.2.5 polkadot
If you want to do anything on it (not that there's much to do), then you'll need to get an account and some Alexander or Krumme Lanke DOTs. Ask in the Polkadot watercooler ( https://riot.im/app/#/room/#polkadot-watercooler:matrix.org ) or get some from the Polkadot Testnet Faucet ( https://faucet.polkadot.network/ ).
You can run a simple single-node development "network" on your machine by
running in a terminal:
You can muck around by cloning and building the http://github.com/paritytech/polka-ui and http://github.com/paritytech/polkadot-ui or just heading to https://polkadot.js.org/apps and choose "Alexander (hosted by Parity)" from the Settings menu.
=== Hacking on Polkadot
If you'd actually like hack on Polkadot, you can just grab the source code and build it. Ensure you have Rust and the support software installed:
[source, shell]
----
curl https://sh.rustup.rs -sSf | sh
rustup update nightly
rustup target add wasm32-unknown-unknown --toolchain nightly
rustup update stable
cargo install --git https://github.com/alexcrichton/wasm-gc
sudo apt install cmake pkg-config libssl-dev git clang
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Then, grab the Polkadot source code:
[source, shell]
----
git clone https://github.com/paritytech/polkadot.git
cd polkadot
----
Then build the code:
[source, shell]
----
./scripts/build.sh # Builds the WebAssembly binaries
cargo build # Builds all native code
----
You can run the tests if you like:
[source, shell]
cargo test --all
You can start a development chain with:
[source, shell]
cargo run -- --dev
Detailed logs may be shown by running the node with the following environment variables set:
[source, shell]
RUST_LOG=debug RUST_BACKTRACE=1 cargo run —- --dev
=== Local Two-node Testnet
If you want to see the multi-node consensus algorithm in action locally, then you can create a local testnet. You'll need two terminals open. In one, run:
[source, shell]
polkadot --chain=local --validator --key Alice -d /tmp/alice
[source, shell]
polkadot --chain=local --validator --key Bob -d /tmp/bob --port 30334 --bootnodes '/ip4/127.0.0.1/tcp/30333/p2p/ALICE_BOOTNODE_ID_HERE'
Ensure you replace `ALICE_BOOTNODE_ID_HERE` with the node ID from the output of the first terminal.
=== Using Docker
link:doc/shell-completion.adoc[Shell Completion]
link:doc/networks/networks.adoc[Polkadot Networks]
== Contributing
=== Contributing Guidelines
link:CONTRIBUTING.adoc[Contribution Guidelines]
=== Contributor Code of Conduct
link:CODE_OF_CONDUCT.adoc[Code of Conduct]
https://github.com/paritytech/polkadot/blob/master/LICENSE[LICENSE]
== Important Notice
https://polkadot.network/testnetdisclaimer