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Kujira Oracle Guide

Introduction

Validators are required to submit price feeds for the on-chain oracle. The price-feeder app can get price data from multiple providers and submit oracle votes to perform this duty.

Requirements

  • This guide assumes you are running Ubuntu 22.04.
  • price-feeder needs access to a running node's RPC and gRPC ports. This guide assumes you have it on the same machine and uses localhost with default ports 26657 and 9090. Change these in config.toml as needed.

User setup

Best practice is to run node software on an isolated unprivileged user. We'll create the kujioracle user in this guide; if your username is different change it wherever it appears.

Create the kujioracle user

sudo useradd -m -s /bin/bash kujioracle

Build environment setup

If you've already followed the Node Guide, the only steps you need in this section are Install go toolchain #2 and #3. Repeating the others won't hurt if you want to be safe.

Install build packages

sudo apt install -y build-essential git unzip curl

Install go toolchain

  1. Download and extract go 1.18.5. 
    curl -fsSL https://golang.org/dl/go1.18.5.linux-amd64.tar.gz | sudo tar -xzC /usr/local
  2. Login as kujioracle. 
    sudo su -l kujioracle
  3. Configure environment variables for kujioracle. 
    cat <<EOF >> ~/.bashrc
export GOROOT=/usr/local/go
export GOPATH=\$HOME/go
export GO111MODULE=on
export PATH=\$PATH:/usr/local/go/bin:\$HOME/go/bin
EOF
source ~/.bashrc
go version  # should output "go version go1.18.5 linux/amd64"

Build price-feeder

  1. Login as kujioracle (skip if you're already logged in). 
    sudo su -l kujioracle
  2. Build kujirad v0.5.0. We'll use the binary to create the keyring file. 
    git clone https://github.com/Team-Kujira/core
cd core
git checkout v0.5.0
make install
cd ..
kujirad version  # should output "0.5.0"
  3. Build price-feeder. 
    git clone https://github.com/Team-Kujira/oracle-price-feeder
cd oracle-price-feeder
make install
price-feeder version

Configure price-feeder

Create a wallet

This wallet will be relatively insecure, only store the funds you need to send votes.

  1. Login as kujioracle (skip if you're already logged in). 
    sudo su -l kujioracle
  2. Create the wallet and a password for the keyring. 
    kujirad keys add oracle
  3. Configure the keyring-file directory. This allows price-feeder to find the keyring. 
    mkdir ~/.kujira/keyring-file
mv ~/.kujira/*.info ~/.kujira/*.address ~/.kujira/keyring-file

Set the feeder delegation

This step will authorize your new wallet to send oracle votes on behalf of your validator. The transaction should be sent from the validator wallet so run on a node where it's available.

  • Replace <oracle_wallet> with your new wallet address.
  • Replace <validator_wallet> with you validator wallet name.
kujirad tx oracle set-feeder <oracle_wallet> --from <validator_wallet> --fees 250ukuji

Create the config

  1. Login as kujioracle (skip if you're already logged in). 
    sudo su -l kujioracle

  2. Create the config file with your favorite text editor.

    • Replace <wallet_address> with your oracle wallet address (e.g. kujira16jchc8l8hfk98g4gnqk4pld29z385qyseeqqd0)
    • Replace <validator_address> with your validator address (e.g. kujiravaloper1e9rm4nszmfg3fdhrw6s9j69stqddk7ga2x84yf)
    ~/config.toml
    gas_adjustment = 1.5
gas_prices = "0.00125ukuji"
enable_server = true
enable_voter = true
provider_timeout = "500ms"

[server]
listen_addr = "0.0.0.0:7171"
read_timeout = "20s"
verbose_cors = true
write_timeout = "20s"

[[deviation_thresholds]]
base = "USDT"
threshold = "2"

[[currency_pairs]]
base = "ATOM"
providers = [
  "binance",
  "kraken",
  "osmosis",
]
quote = "USD"

[account]
address = "<wallet_address>"
chain_id = "kaiyo-1"
validator = "<validator_address>"
prefix = "kujira"

[keyring]
backend = "file"
dir = "/home/kujioracle/.kujira"

[rpc]
grpc_endpoint = "localhost:9090"
rpc_timeout = "500ms"
tmrpc_endpoint = "http://localhost:26657"

[telemetry]
enable_hostname = true
enable_hostname_label = true
enable_service_label = true
enabled = true
global_labels = [["chain_id", "kaiyo-1"]]
service_name = "price-feeder"
type = "prometheus"

[[provider_endpoints]]
name = "binance"
rest = "https://api1.binance.us"
websocket = "stream.binance.us:9443"

Configure the currency pairs

The [[currency_pairs]] provided in the config above is only an example, each validator should modify this to submit prices for the denoms whitelisted by the chain. Keep an eye out for governance proposals introducing new denoms and check the current ones here: kaiyo-1 oracle parameters.

Run price-feeder

  1. Login as kujioracle (skip if you're already logged in). 
    sudo su -l kujioracle
  2. Run the app, providing the password on stdin. 
    echo <keyring_password> | price-feeder ~/config.toml

Create a service

A systemd service will keep price-feeder running in the background and restart it if it stops.

  1. Create the service file with sudo using your favorite text editor. Replace <keyring_password> with the one you created.
    /etc/systemd/system/kujira-price-feeder.service
    [Unit]
Description=kujira-price-feeder
After=network.target

[Service]
Type=simple
User=kujioracle
ExecStart=/home/kujioracle/go/bin/price-feeder /home/kujioracle/config.toml --log-level debug
Restart=on-abort
LimitNOFILE=65535
Environment="PRICE_FEEDER_PASS=<keyring_password>"
WorkingDirectory=/home/kujioracle

[Install]
WantedBy=multi-user.target
  2. Reload systemd to pick up the new service. 
    sudo systemctl daemon-reload
  3. Start the service. 
    sudo systemctl start kujira-price-feeder
  4. Tail your service logs. 
    sudo journalctl -fu kujira-price-feeder
  5. (Optional) Enable the service. This will set it to start on every boot. 
    sudo systemctl enable kujira-price-feeder