probe.py

@plugin.method("probe")
def probe(plugin, node_id, **kwargs):
    """Probe a network by sending a payment to it.
    """
    probe = {
        'destination': node_id,
        'started_at': str(datetime.now()),
    }
    try:
        probe['route'] = plugin.rpc.getroute(
            probe['destination'],
            msatoshi=10000,
            riskfactor=1,
        )['route']
        probe['payment_hash'] = ''.join(random.choice(string.hexdigits) for _ in range(64))
    except RpcError:
        probe['failcode'] = -1
        return probe
    plugin.rpc.sendpay(probe['route'], probe['payment_hash'])

    try:
        plugin.rpc.waitsendpay(probe['payment_hash'])
        raise ValueError("The recipient guessed the preimage? Cryptography is broken!!!")
    except RpcError as e:
        probe['finished_at'] = str(datetime.now())
        probe['error'] = e.error['data']
        probe['failcode'] = e.error['data']['failcode']

    return probe