Oracle Price Feeder

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.
This guide assumes you are configuring the oracle for a mainnet (kaiyo-1) validator.
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 Run a 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 1.20.8.
curl -fsSL https://golang.org/dl/go1.20.8.linux-amd64.tar.gz | sudo tar -xzC /usr/local
1.Login as kujioracle.
sudo su -l kujioracle
1.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
1.Build kujirad v0.9.1. We'll use the binary to create the keyring file.
git clone https://github.com/Team-Kujira/core
cd core
git checkout v0.9.1
make install
cd ..
kujirad version  # should output "0.9.1"
1.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
1.Create the wallet and a password for the keyring.
kujirad keys add oracle
1.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
1.Create the config file with your favorite text editor (for example nano).
Refer to config.example.toml for a sample file.
Replace <wallet_address> with your oracle wallet address (e.g. kujira16jchc8l8hfk98g4gnqk4pld29z385qyseeqqd0)
Replace <validator_address> with your validator address (e.g. kujiravaloper1e9rm4nszmfg3fdhrw6s9j69stqddk7ga2x84yf)
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.
NOTE: It is important that currency pairs in this config exactly match those in the currently configured whitelist for the chain:
Testnet: harpoon-4​
Mainnet: kaiyo-1​
You can also query the oracle params using kujirad
kujirad query oracle params
Advanced Setup
Provider Endpoints
It is possible to overwrite default provider endpoints (e.g. to point to an alternate mirror) by specifying them in [[provider_endpoints]].
Example for Binance.US
[[provider_endpoints]]
name = "binance"
rest = "https://api.binance.us"
websocket = "stream.binance.us:9443"
Addresses & Voting Delegate
The price-feeder submits transactions on behalf of your validator that contain prices of specified denoms. The feeder account will need enough funding to pay for gas for these automatic vote transactions perpetually. Due to how this is performed by price-feeder, it's highly recommended to use a delegate feeder account rather than the validator account as the feeder wallet key is potentially more exposed.
[account]
address = "kujira...." # feeder wallet address
chain_id = "<kaiyo-1>"
validator = "kujiravaloper...." # validator address
prefix = "kujira"
Ensure the validator address is set to your validator address.​
Ensure that address is set to the address of your feeder wallet. By default this is the same as the kujira address for your validator key, however it's likely that you'll want to set a delegate feeder account to your validator so that you can run price-feeder on a separate user account or separate server, with different keys.
To set a delegate:
kujirad tx oracle set-feeder kujira1243.....
Keyring Backend
Depending on your infrastructure you may have a different preference for your keyring backend. If you are running price-feeder on a separate account or separate server, you can experiment with different keyring backends without any risk to your running validator - however, you risk corrupting your validator keys if you are not using a separate account or server for price-feeder (again, this configuration is not recommended)
​https://github.com/Team-Kujira/oracle-price-feeder/blob/master/config.example.toml#L55-L57​
OS
[keyring]
backend = "os"
# dir is ignored for os
dir = "/home/kuji/.kujira"
FILE
Create a file keyring
kujirad keys add oracle
mkdir ~/.kujira/keyring-file
mv ~/.kujira/*.address ~/.kujira/*.info ~/.kujira/keyring-file
Set the password variable
export PRICE_FEEDER_PASS=<keyring_password>
Update config.toml
[keyring]
backend = "file"
dir = "/home/kuji/.kujira"
PASS
You may need to install pass first:
​https://www.passwordstore.org​
And then set your passphrase to env
export PRICE_FEEDER_PASS=...  
[keyring]
backend = "pass"
# dir is ignored for pass
dir = "/home/kuji/.kujira"
RPC Endpoints
If price-feeder is running on the same server as your node and your node is using default ports, the default RPC configuration should work.
If you are running a different node configuration, you may need to edit these RPC settings to match your infrastructure.
[rpc]
grpc_endpoint = "localhost:9090"
rpc_timeout = "100ms"
tmrpc_endpoint = "http://localhost:26657"
Telemetry & Prometheus
Telemetry is provided by the Cosmos SDK Telemetry module. To query metrics from a running price-feeder, pipe the output into jq
curl "http://localhost:7171/api/v1/metrics" | jq
To publish price-feeder metrics in prometheus format, the config.toml must include the prometheus_retention flag
Example Telemetry configuration block with Prometheus format enabled:
[telemetry]
enable_hostname = true
enable_hostname_label = true
enable_service_label = true
enabled = true
global_labels = [["chain_id", "kaiyo-1/harpoon-4"]]
service_name = "price-feeder"
type = "prometheus"
prometheus_retention = 120
Example scrape_config in Prometheus:
scrape_configs:
  - job_name: price-feeder
    metrics_path: '/api/v1/metrics'
    params:
      format: ['prometheus']
    static_configs:
      - targets:
          - <price-feeder-IP-addr>:7171
        labels: {}
Run price-feeder
1.Login as kujioracle (skip if you're already logged in).
sudo su -l kujioracle
1.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.
[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>"
​
[Install]
WantedBy=multi-user.target
1.Reload systemd to pick up the new service.
sudo systemctl daemon-reload
1.Start the service.
sudo systemctl start kujira-price-feeder
1.Tail your service logs.
sudo journalctl -fu kujira-price-feeder
1.(Optional) Enable the service. This will set it to start on every boot.
sudo systemctl enable kujira-price-feeder

Create a validator

Tips

Last modified 9d ago

Oracle Price Feeder

Introduction

Requirements

User setup

Create the `kujioracle` user

Build environment setup

Install build packages

Install go toolchain

Build `price-feeder`

Configure `price-feeder`

Create a wallet

Set the feeder delegation

Create the config

Configure the currency pairs

Advanced Setup

Provider Endpoints

Example for Binance.US

Addresses & Voting Delegate

Keyring Backend

OS

FILE

PASS

RPC Endpoints

Telemetry & Prometheus

Run `price-feeder`

Create a service