一个好的接口可以给自动化测试带来无限的动力，如果接口不好，我们可能会调用ssh去执行bash，或者调用Pexpect库去交互，但是有好的接口，给我们的只是一个包，那就是一个好的自动化测试工具。

TRex Stateful Python API测试

1. 启动 Stateful Server
   root@trex:/tmp/trex/v2.23# ./trex_daemon_server restart TRex server daemon is killed Firing up TRex REST daemon @ port 8090 ... TRex server daemon is started
2. 进入目录
   root@trex:/tmp/trex/v2.23# cd automation/trex_control_plane/stf/examples/
3. gav.py

1 import argparse  2 import stf_path  3 from trex_stf_lib.trex_client import CTRexClient  4 from pprint import pprint  5   6 # sample TRex stateful run  7 # assuming server daemon is running.  8   9 def minimal_stateful_test(server): 10     print('Connecting to %s' % server) 11     trex_client = CTRexClient(server) 12  13     print('Connected, start TRex') 14     trex_client.start_trex( 15             c = 1, 16             m = 1, 17             f = 'cap2/http_virus.yaml', 18             d = 30, 19             ) 20  21     print('Sample until end') 22     result = trex_client.sample_to_run_finish() 23  24     print('Test results:') 25     print(result) 26  27     print('TX by ports:') 28     tx_ptks_dict = result.get_last_value('trex-global.data', 'opackets-*') 29     print('  |  '.join(['%s: %s' % (k.split('-')[-1], tx_ptks_dict[k]) for k in sorted(tx_ptks_d    ict.keys())])) 30  31     print('RX by ports:') 32     rx_ptks_dict = result.get_last_value('trex-global.data', 'ipackets-*') 33     print('  |  '.join(['%s: %s' % (k.split('-')[-1], rx_ptks_dict[k]) for k in sorted(rx_ptks_d    ict.keys())])) 34  35     print('CPU utilization:') 36     print(result.get_value_list('trex-global.data.m_cpu_util')) 37  38     #Dump of *latest* result sample, uncomment to see it all 39     #print('Latest result dump:') 40     #pprint(result.get_latest_dump()) 41  42  43 if __name__ == '__main__': 44     parser = argparse.ArgumentParser(description="Example for TRex Stateful, assuming server dae    mon is running.") 45     parser.add_argument('-s', '--server', 46                         dest='server', 47                         help='Remote trex address', 48                         default='127.0.0.1', 49                         type = str) 50     args = parser.parse_args() 51  52     minimal_stateful_test(args.server)

4. result

root@trex:/tmp/trex/v2.23/automation/trex_control_plane/stf/examples# python gav.py Connecting to 127.0.0.1Connected, start TRexSample until endTest results:Is valid history?       TrueDone warmup?            TrueExpected tx rate:       {u'm_tx_expected_pps': 2800.0, u'm_tx_expected_bps': 14577600.0, u'm_tx_expected_cps': 100.0}Current tx rate:        {u'm_tx_bps': 5102998.5, u'm_tx_cps': 31.6, u'm_tx_pps': 978.1}Minimum latency:        NoneMaximum latency:        NoneAverage latency:        NoneAverage window latency: NoneTotal drops:            44986Drop rate:              3328075.8History size so far:    34TX by ports:0: 38987  |  1: 44985RX by ports:0: 23991  |  1: 14995CPU utilization:[0.0, 0.06825, 1.015, 1.059, 0.8428, 0.7444, 0.6778, 0.5246, 0.7297, 0.705, 0.546, 0.4228, 0.6708, 0.5279, 0.5601, 0.4331, 0.3598, 0.4806, 0.412, 0.369, 0.3962, 0.3549, 0.2902, 0.2594, 0.2125, 0.4259, 0.3509, 0.2767, 0.2138, 0.3293, 0.4195, 0.4195, 0.4195, 0.4195]

5. 在结果中可以显示发包，收包速率，以及CPU的利用率，当然还可以知道其它的一些关键字，因此适合在自动化中运用

参考

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