def ping(proxy=None, hostport=None):
    """
    rpc_ping
    Returns {'alive': True} on succcess
    Returns {'error': ...} on error
    """
    schema = {
        'type': 'object',
        'properties': {
            'status': {
                'type': 'string'
            },
        },
        'required': [
            'status'
        ]
    }

    assert proxy or hostport, 'Need either proxy handle or hostport string'
    if proxy is None:
        proxy = connect_hostport(hostport)

    resp = {}

    try:
        resp = proxy.ping()
        resp = json_validate( schema, resp )
        if json_is_error(resp):
            return resp

        assert resp['status'] == 'alive'

    except ValidationError as e:
        if BLOCKSTACK_DEBUG:
            log.exception(e)

        resp = {'error': 'Server response did not match expected schema.  You are likely communicating with an out-of-date Blockstack node.', 'http_status': 502}
        return resp

    except socket.timeout:
        log.error("Connection timed out")
        resp = {'error': 'Connection to remote host timed out.', 'http_status': 503}
        return resp

    except socket.error as se:
        log.error("Connection error {}".format(se.errno))
        resp = {'error': 'Connection to remote host failed.', 'http_status': 502}
        return resp

    except Exception as ee:
        if BLOCKSTACK_DEBUG:
            log.exception(ee)

        log.error("Caught exception while connecting to Blockstack node: {}".format(ee))
        resp = {'error': 'Failed to contact Blockstack node.  Try again with `--debug`.', 'http_status': 500}
        return resp

    return resp
def ping ( proxy = None , hostport = None ) : schema = { 'type' : 'object' , 'properties' : { 'status' : { 'type' : 'string' } , } , 'required' : [ 'status' ] } assert proxy or hostport , 'Need either proxy handle or hostport string' if proxy is None : proxy = connect_hostport ( hostport ) resp = { } try : resp = proxy . ping ( ) resp = json_validate ( schema , resp ) if json_is_error ( resp ) : return resp assert resp [ 'status' ] == 'alive' except ValidationError as e : if BLOCKSTACK_DEBUG : log . exception ( e ) resp = { 'error' : 'Server response did not match expected schema.  You are likely communicating with an out-of-date Blockstack node.' , 'http_status' : 502 } return resp except socket . timeout : log . error ( "Connection timed out" ) resp = { 'error' : 'Connection to remote host timed out.' , 'http_status' : 503 } return resp except socket . error as se : log . error ( "Connection error {}" . format ( se . errno ) ) resp = { 'error' : 'Connection to remote host failed.' , 'http_status' : 502 } return resp except Exception as ee : if BLOCKSTACK_DEBUG : log . exception ( ee ) log . error ( "Caught exception while connecting to Blockstack node: {}" . format ( ee ) ) resp = { 'error' : 'Failed to contact Blockstack node.  Try again with `--debug`.' , 'http_status' : 500 } return resp return resp
rpc_ping
    Returns {'alive': True} on succcess
    Returns {'error': ...} on error