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Dicon GP700 GPIB Scanning script for I-matrix
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| #!/usr/bin/env python3 | |
| import pyvisa | |
| import subprocess | |
| import re | |
| import time | |
| def optical_data(iface): | |
| # no json support in ethtool for eeprom dump yet :( | |
| for _ in range(10): | |
| try: | |
| odraw = subprocess.check_output(['sudo', '/home/bluecmd/ethtool/ethtool', '-m', iface]).decode() | |
| except subprocess.CalledProcessError: | |
| # retry if netlink is acting up | |
| time.sleep(0.1) | |
| continue | |
| od = [[y.strip() for y in x.split(':', maxsplit=1)] for x in odraw.strip().split('\n')] | |
| rcvr_dbm = [] | |
| xmit_dbm = [] | |
| for key, value in od: | |
| g = re.search(r'\/ ([-0-9.]+) dBm', value) | |
| if key.startswith('Rcvr signal avg optical power'): | |
| rcvr_dbm.append(float(g.group(1)) if g else -40.0) | |
| elif key.startswith('Transmit avg optical power'): | |
| xmit_dbm.append(float(g.group(1)) if g else -40.0) | |
| return round(sum(xmit_dbm)/len(xmit_dbm), 2), round(sum(rcvr_dbm)/len(rcvr_dbm), 2) | |
| def generate_paths(src, dst, loop_list): | |
| # loopback | |
| yield 'Loopback', ((src, dst),) | |
| # 1 hop | |
| for port in loop_list: | |
| yield f'Via {port}', ((src, port), (port, dst)) | |
| # 2 hop | |
| for port1 in loop_list: | |
| for port2 in loop_list: | |
| if port2 == port1: | |
| continue | |
| yield f'Via {port1} -> {port2}', ((src, port1), (port1, port2), (port2, dst)) | |
| # 3 hop | |
| for port1 in loop_list: | |
| for port2 in loop_list: | |
| if port2 == port1: | |
| continue | |
| for port3 in loop_list: | |
| if port3 == port2 or port3 == port1: | |
| continue | |
| yield f'Via {port1} -> {port2} -> {port3}', ((src, port1), (port1, port2), (port2, port3), (port3, dst)) | |
| if __name__ == '__main__': | |
| rm = pyvisa.ResourceManager() | |
| gp700 = rm.open_resource('GPIB0::30::INSTR') | |
| id_mf, id_model, id_serial, id_fw = [x.strip() for x in gp700.query('*IDN?').strip().split(',')] | |
| if id_mf != 'DiCon Fiberoptics Inc' or id_model != 'GP700': | |
| raise Exception(f'Unsupported device: {id_mf}, {id_model}') | |
| print(f' [*] Connected to {id_model}') | |
| loop_list = range(4, 16) | |
| for src, dst, iface in ((1, 1, 'ens1f0'), (2, 2, 'ens1f1')): | |
| with open(f'{iface}.{int(time.time())}.results', 'w') as res: | |
| print(f' [*] Starting scan session for {iface}') | |
| for descr, path in generate_paths(src, dst, loop_list=loop_list): | |
| for port, sel in path: | |
| gp700.write(f'I{port} {sel}') | |
| time.sleep(0.1) | |
| time.sleep(2) | |
| xmit, rcv = optical_data(iface) | |
| loss_dbm = rcv - xmit | |
| print(' [*] Scenario:', descr, '=> {0:0.2f} dBm'.format(loss_dbm)) | |
| res.write(','.join((str(x[0]) for x in path)) + ' {0:0.2f}'.format(loss_dbm) + '\n') | |
| res.flush() | |
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