add network script for integration testing with nigiri (LND and CLN)

Signed-off-by: Gustavo Chain <me@qustavo.cc>

Author: qustavo

scripts/network.sh

@@ -0,0 +1,101 @@
+#!/bin/bash
+set -eu
+
+# network.sh — start/stop Docker network for integration tests using nigiri
+
+usage() {
+	cat <<EOF
+Usage: $(basename "$0") <command>
+
+Commands:
+  start    Start bitcoind + two LND nodes (alice, bob)
+  stop     Stop and remove all containers and the network
+
+Examples:
+  $(basename "$0") start
+  $(basename "$0") stop
+EOF
+}
+
+cmd_start() {
+	echo "Starting l402 integration network..."
+	nigiri start --ln
+	echo
+
+	echo -n "✓ Waiting for LND to become active "
+	until [[ $(nigiri lnd state | jq -r .state) == 'SERVER_ACTIVE' ]]; do
+		sleep 1
+		echo -n "."
+	done
+	echo
+
+	echo -n "✓ Waiting for LND to sync with the chain "
+	until [[ $(nigiri lnd getinfo | jq -r .synced_to_chain) == 'true' ]]; do
+		sleep 1
+		echo -n "."
+	done
+	echo
+
+	echo -n "✓ Waiting for CLN to be ready "
+	until [[ $(nigiri cln getinfo | jq -r .blockheight) != 0 ]]; do
+		sleep 1
+		echo -n "."
+	done
+	echo
+
+	echo -n "✓ Funding onchain wallets"
+	nigiri faucet lnd 1
+	nigiri faucet cln 1
+
+	echo "Opening channel LND -> CLN"
+	CLN_PUBKEY=$(nigiri cln getinfo | jq -r .id)
+	nigiri lnd connect $CLN_PUBKEY@cln:9935
+	nigiri lnd openchannel --node_key $CLN_PUBKEY --local_amt 10000000
+	nigiri rpc -generate 6 # mature the channel
+
+	echo -n "Waiting for channel to be active "
+	until [[ $(nigiri lnd listchannels | jq '.channels[0].active') == true ]]; do
+		sleep 1
+		echo -n "."
+	done
+	echo
+
+	echo "Sending 10k sats from LND to CLN"
+	INVOICE=$(nigiri cln invoice 10000000 $RANDOM test | jq -r .bolt11)
+	nigiri lnd payinvoice $INVOICE -f
+
+	echo "✓ Network ready to test"
+}
+
+cmd_stop() {
+	echo "Stopping l402 integration network..."
+	nigiri stop --delete
+	echo "✓ Network stopped"
+}
+
+main() {
+	if [[ $# -eq 0 ]]; then
+		usage
+		exit 1
+	fi
+
+	case "$1" in
+		start)
+			cmd_start
+			;;
+		stop)
+			cmd_stop
+			;;
+		-h|--help|help)
+			usage
+			exit 0
+			;;
+		*)
+			echo "Error: unknown command '$1'"
+			usage
+			exit 1
+			;;
+	esac
+}
+
+main "$@"