Mercurial > hg-stable
annotate contrib/catapipe.py @ 39330:1eb370761fa0
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author | Yuya Nishihara <yuya@tcha.org> |
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date | Sat, 25 Aug 2018 20:16:28 +0900 |
parents | 9a81f126f9fa |
children | e9706686451b |
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1 #!/usr/bin/env python3 |
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2 # |
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3 # Copyright 2018 Google LLC. |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 """Tool read primitive events from a pipe to produce a catapult trace. |
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8 |
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9 For now the event stream supports |
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10 |
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11 START $SESSIONID ... |
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12 |
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13 and |
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14 |
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15 END $SESSIONID ... |
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16 |
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17 events. Everything after the SESSIONID (which must not contain spaces) |
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18 is used as a label for the event. Events are timestamped as of when |
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19 they arrive in this process and are then used to produce catapult |
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20 traces that can be loaded in Chrome's about:tracing utility. It's |
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21 important that the event stream *into* this process stay simple, |
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22 because we have to emit it from the shell scripts produced by |
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23 run-tests.py. |
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24 |
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25 Typically you'll want to place the path to the named pipe in the |
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26 HGCATAPULTSERVERPIPE environment variable, which both run-tests and hg |
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27 understand. |
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28 """ |
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29 from __future__ import absolute_import, print_function |
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30 |
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31 import argparse |
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32 import datetime |
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33 import json |
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34 import os |
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35 |
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36 _TYPEMAP = { |
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37 'START': 'B', |
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38 'END': 'E', |
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39 } |
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40 |
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41 _threadmap = {} |
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42 |
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43 def main(): |
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44 parser = argparse.ArgumentParser() |
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45 parser.add_argument('pipe', type=str, nargs=1, |
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46 help='Path of named pipe to create and listen on.') |
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47 parser.add_argument('output', default='trace.json', type=str, nargs='?', |
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48 help='Path of named pipe to create and listen on.') |
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49 parser.add_argument('--debug', default=False, action='store_true', |
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50 help='Print useful debug messages') |
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51 args = parser.parse_args() |
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52 fn = args.pipe[0] |
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53 os.mkfifo(fn) |
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54 try: |
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55 with open(fn) as f, open(args.output, 'w') as out: |
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56 out.write('[\n') |
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57 start = datetime.datetime.now() |
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58 while True: |
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59 ev = f.readline().strip() |
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60 if not ev: |
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61 continue |
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62 now = datetime.datetime.now() |
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63 if args.debug: |
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64 print(ev) |
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65 verb, session, label = ev.split(' ', 2) |
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66 if session not in _threadmap: |
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67 _threadmap[session] = len(_threadmap) |
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68 pid = _threadmap[session] |
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69 ts_micros = (now - start).total_seconds() * 1000000 |
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70 out.write(json.dumps( |
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71 { |
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72 "name": label, |
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73 "cat": "misc", |
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74 "ph": _TYPEMAP[verb], |
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75 "ts": ts_micros, |
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76 "pid": pid, |
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77 "tid": 1, |
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78 "args": {} |
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79 })) |
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80 out.write(',\n') |
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81 finally: |
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82 os.unlink(fn) |
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83 |
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84 if __name__ == '__main__': |
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85 main() |