Sync test script

We test whether the branch contains breaking changes from master using this script.

#/bin/bash

## USAGE
## ./cross-sync.sh master feature/blah ./db-synctest 192.168.100.123:3485 192.168.100.123:8080

BASE=$1
REMOTE=$2
DB_PATH=$3
BOOTSTRAP=$4
JSON_RPC=$5

function best_block_number() {
	local HOST=$1

	local RESP=`curl --retry 5 --retry-connrefused \
		-s -H 'Content-Type: application/json' \
		-d '{"jsonrpc": "2.0", "method": "chain_getBestBlockNumber", "params": [], "id": null}' \
		$HOST`
	echo $RESP | sed -n 's/.*"result":\([0-9]*\).*/\1/p'
}

function upstream_block_number() { best_block_number "$JSON_RPC"; }

function current_block_number() { best_block_number "http://localhost:8080"; }

function sync_to() {
	local TARGET_BN=$1
	local DB_PATH=$2
	local BRANCH=$3
	local WAIT_MORE=$4
	
	git checkout $BRANCH
	cargo build --release

	ENABLE_DELEGATIONS=true \
	ENABLE_ORDER=true \
	RUST_LOG=info,mio=warn,tokio=warn,hyper=warn,rpc=info \
	./target/release/codechain -c corgi --jsonrpc-port 8080 --port 3485 \
		--no-tx-relay --enable-devel-api --no-miner --no-discovery \
		--bootstrap-addresses $BOOTSTRAP \
		--db-path "$DB_PATH" &
	CODECHAIN=$!
	trap "kill -INT $CODECHAIN; wait $CODECHAIN; exit" SIGINT
	sleep 2
	while true; do
		BN=`current_block_number`
		if [ "$BN" -ge "$TARGET_BN" ]; then 
			break
		fi
		echo "$BRANCH-$DB_PATH $BN/$TARGET_BN" >> ./cross-sync.log
		sleep 1
	done
	sleep $WAIT_MORE
	kill -INT $CODECHAIN
	wait $CODECHAIN
	trap 'exit -1' SIGINT
}

function run(){
	local DB_PATH=$1
	local SCRATCH=$2
	local CONTINUE=$3

	# sccache makes 'error reading compile response from server' error
	unset RUSTC_WRAPPER

	# Sync from scratch with branch SCRATCH
	sync_to `upstream_block_number` "$DB_PATH" "$SCRATCH" 0

	# Continue to sync with branch CONTINUE
	sync_to `upstream_block_number` "$DB_PATH" "$CONTINUE" 60
}

set -ex
echo "" > ./cross-sync.log
run "$DB_PATH-base-remote" "$BASE" "$REMOTE"
run "$DB_PATH-remote-base" "$REMOTE" "$BASE"

If your JSONRPC is behind the ssh, you can try forwarding

ssh ssh -o 'ControlPath ./jsonrpc.ctrl' -fNTM -L 9000:localhost:8080 $SSH_JSON_RPC
bash cross-sync.sh
ssh -o 'ControlPath ./jsonrpc.ctrl' -TO exit $SSH_JSON_RPC