Lisk lisk_bridge.sh just for custom commands. Usage: `python lisk_bridge_light.py -h 5594490 -c "echo 123 | hexdump -C"`

lisk_bridge_light.py

try:
    import urllib2 as urlreq # Python 2.x
except:
    import urllib.request as urlreq # Python 3.x
import json
import subprocess
import sys
import time

import argparse

parser = argparse.ArgumentParser(description='Lisk bridge light', add_help=False)
parser.add_argument('-h', '--height', dest='height', required=True,
                    type=int,
                    nargs=1, metavar=("height"))
parser.add_argument('-c', '--command', dest='command', required=True,
                    type=str,
                    help="command to execute (in shell) when target height is reached",
                    nargs=1, metavar=("command"))

args = parser.parse_args()
cutoff = args.height[0]
command = args.command[0]

print("Executing '{}' when target height is reached.".format(command))

height = None

while height is None or height < cutoff:
    time.sleep(0.5)
    req = urlreq.Request("http://localhost:7000/api/loader/status/sync")
    try:
        body = json.load(urlreq.urlopen(req))
        height = body["height"]
        remaining_blocks = cutoff-height
        remaining_time = remaining_blocks*10
        min, sec = divmod(remaining_time, 60)
        hours, min = divmod(min, 60)
        print("height: {}; target: {}; remaining: {} blocks ({}h {}m {}s)".format(height, cutoff, remaining_blocks, hours, min, sec))
    except:
        print("Could not get height")
        height = None

if height != cutoff:
    print("Cutoff not met. Aborting.")
    sys.exit(1)


print("Executing '{}' now...".format(command))
subprocess.check_call(command, shell=True)