local_node.sh

#!/bin/bash

KEYS[0]="dev0"
KEYS[1]="dev1"
KEYS[2]="dev2"
CHAINID="cascadia_6102-1"
MONIKER="localtestnet"
# Remember to change to other types of keyring like 'file' in-case exposing to outside world,
# otherwise your balance will be wiped quickly
# The keyring test does not require private key to steal tokens from you
KEYRING="test"
KEYALGO="eth_secp256k1"
LOGLEVEL="info"
# Set dedicated home directory for the cascadiad instance
HOMEDIR="$HOME/.cascadiad"
# to trace evm
#TRACE="--trace"
TRACE=""

# Path variables
CONFIG=$HOMEDIR/config/config.toml
APP_TOML=$HOMEDIR/config/app.toml
GENESIS=$HOMEDIR/config/genesis.json
TMP_GENESIS=$HOMEDIR/config/tmp_genesis.json

# validate dependencies are installed
command -v jq >/dev/null 2>&1 || {
	echo >&2 "jq not installed. More info: https://stedolan.github.io/jq/download/"
	exit 1
}

# used to exit on first error (any non-zero exit code)
set -e

# Reinstall daemon
make install

# User prompt if an existing local node configuration is found.
if [ -d "$HOMEDIR" ]; then
	printf "\nAn existing folder at '%s' was found. You can choose to delete this folder and start a new local node with new keys from genesis. When declined, the existing local node is started. \n" "$HOMEDIR"
	echo "Overwrite the existing configuration and start a new local node? [y/n]"
	read -r overwrite
else
	overwrite="Y"
fi


# Setup local node if overwrite is set to Yes, otherwise skip setup
if [[ $overwrite == "y" || $overwrite == "Y" ]]; then
	# Remove the previous folder
	rm -rf "$HOMEDIR"

	# Set client config
	cascadiad config keyring-backend $KEYRING --home "$HOMEDIR"
	cascadiad config chain-id $CHAINID --home "$HOMEDIR"

	# If keys exist they should be deleted
	for KEY in "${KEYS[@]}"; do
		cascadiad keys add "$KEY" --keyring-backend $KEYRING --algo $KEYALGO --home "$HOMEDIR"
	done

	# Set moniker and chain-id for Cascadia (Moniker can be anything, chain-id must be an integer)
	cascadiad init $MONIKER -o --chain-id $CHAINID --home "$HOMEDIR"

	jq '.app_state["staking"]["params"]["bond_denom"]="aCC"' "$GENESIS" >"$TMP_GENESIS" && mv "$TMP_GENESIS" "$GENESIS"
	jq '.app_state["crisis"]["constant_fee"]["denom"]="aCC"' "$GENESIS" >"$TMP_GENESIS" && mv "$TMP_GENESIS" "$GENESIS"
	jq '.app_state["gov"]["deposit_params"]["min_deposit"][0]["denom"]="aCC"' "$GENESIS" >"$TMP_GENESIS" && mv "$TMP_GENESIS" "$GENESIS"

	# Set gas limit in genesis
	jq '.consensus_params["block"]["max_gas"]="10000000"' "$GENESIS" >"$TMP_GENESIS" && mv "$TMP_GENESIS" "$GENESIS"

	# set custom pruning settings
	sed -i.bak 's/pruning = "default"/pruning = "custom"/g' "$APP_TOML"
	sed -i.bak 's/pruning-keep-recent = "0"/pruning-keep-recent = "2"/g' "$APP_TOML"
	sed -i.bak 's/pruning-interval = "0"/pruning-interval = "10"/g' "$APP_TOML"

	# Allocate genesis accounts (cosmos formatted addresses)
	for KEY in "${KEYS[@]}"; do
		cascadiad add-genesis-account "$KEY" 100000000000000000000000000aCC --keyring-backend $KEYRING --home "$HOMEDIR"
	done

	# bc is required to add these big numbers
	total_supply=$(echo "${#KEYS[@]} * 100000000000000000000000000" | bc)
	jq -r --arg total_supply "$total_supply" '.app_state["bank"]["supply"][0]["amount"]=$total_supply' "$GENESIS" >"$TMP_GENESIS" && mv "$TMP_GENESIS" "$GENESIS"

	# Sign genesis transaction
	cascadiad gentx "${KEYS[0]}" 1000000000000000000000aCC --keyring-backend $KEYRING --chain-id $CHAINID --home "$HOMEDIR"
	## In case you want to create multiple validators at genesis
	## 1. Back to `cascadiad keys add` step, init more keys
	## 2. Back to `cascadiad add-genesis-account` step, add balance for those
	## 3. Clone this ~/.cascadiad home directory into some others, let's say `~/.clonedCascadiad`
	## 4. Run `gentx` in each of those folders
	## 5. Copy the `gentx-*` folders under `~/.clonedCascadiad/config/gentx/` folders into the original `~/.cascadiad/config/gentx`

	# Collect genesis tx
	cascadiad collect-gentxs --home "$HOMEDIR"

	# Run this to ensure everything worked and that the genesis file is setup correctly
	cascadiad validate-genesis --home "$HOMEDIR"

	if [[ $1 == "pending" ]]; then
		echo "pending mode is on, please wait for the first block committed."
	fi
fi

# Start the node (remove the --pruning=nothing flag if historical queries are not needed)
cascadiad start --metrics "$TRACE" --log_level info --minimum-gas-prices=0.0001aCC --json-rpc.api eth,txpool,personal,net,debug,web3 --api.enable --home "$HOMEDIR"