#!/usr/bin/env python
# Copyright 2017 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import cgi
import multiprocessing
import os
import subprocess
import sys
import argparse

import python_utils.jobset as jobset
import python_utils.start_port_server as start_port_server

sys.path.append(os.path.join(os.path.dirname(sys.argv[0]), '..', 'profiling', 'microbenchmarks', 'bm_diff'))
import bm_constants

flamegraph_dir = os.path.join(os.path.expanduser('~'), 'FlameGraph')

os.chdir(os.path.join(os.path.dirname(sys.argv[0]), '../..'))
if not os.path.exists('reports'):
  os.makedirs('reports')

start_port_server.start_port_server()

def fnize(s):
  out = ''
  for c in s:
    if c in '<>, /':
      if len(out) and out[-1] == '_': continue
      out += '_'
    else:
      out += c
  return out

# index html
index_html = """
<html>
<head>
<title>Microbenchmark Results</title>
</head>
<body>
"""

def heading(name):
  global index_html
  index_html += "<h1>%s</h1>\n" % name

def link(txt, tgt):
  global index_html
  index_html += "<p><a href=\"%s\">%s</a></p>\n" % (
      cgi.escape(tgt, quote=True), cgi.escape(txt))

def text(txt):
  global index_html
  index_html += "<p><pre>%s</pre></p>\n" % cgi.escape(txt)

def collect_latency(bm_name, args):
  """generate latency profiles"""
  benchmarks = []
  profile_analysis = []
  cleanup = []

  heading('Latency Profiles: %s' % bm_name)
  subprocess.check_call(
      ['make', bm_name,
       'CONFIG=basicprof', '-j', '%d' % multiprocessing.cpu_count()])
  for line in subprocess.check_output(['bins/basicprof/%s' % bm_name,
                                       '--benchmark_list_tests']).splitlines():
    link(line, '%s.txt' % fnize(line))
    benchmarks.append(
        jobset.JobSpec(['bins/basicprof/%s' % bm_name,
                        '--benchmark_filter=^%s$' % line,
                        '--benchmark_min_time=0.05'],
                       environ={'LATENCY_TRACE': '%s.trace' % fnize(line)},
                       shortname='profile-%s' % fnize(line)))
    profile_analysis.append(
        jobset.JobSpec([sys.executable,
                        'tools/profiling/latency_profile/profile_analyzer.py',
                        '--source', '%s.trace' % fnize(line), '--fmt', 'simple',
                        '--out', 'reports/%s.txt' % fnize(line)], timeout_seconds=20*60,
                        shortname='analyze-%s' % fnize(line)))
    cleanup.append(jobset.JobSpec(['rm', '%s.trace' % fnize(line)]))
    # periodically flush out the list of jobs: profile_analysis jobs at least
    # consume upwards of five gigabytes of ram in some cases, and so analysing
    # hundreds of them at once is impractical -- but we want at least some
    # concurrency or the work takes too long
    if len(benchmarks) >= min(16, multiprocessing.cpu_count()):
      # run up to half the cpu count: each benchmark can use up to two cores
      # (one for the microbenchmark, one for the data flush)
      jobset.run(benchmarks, maxjobs=max(1, multiprocessing.cpu_count()/2))
      jobset.run(profile_analysis, maxjobs=multiprocessing.cpu_count())
      jobset.run(cleanup, maxjobs=multiprocessing.cpu_count())
      benchmarks = []
      profile_analysis = []
      cleanup = []
  # run the remaining benchmarks that weren't flushed
  if len(benchmarks):
    jobset.run(benchmarks, maxjobs=max(1, multiprocessing.cpu_count()/2))
    jobset.run(profile_analysis, maxjobs=multiprocessing.cpu_count())
    jobset.run(cleanup, maxjobs=multiprocessing.cpu_count())

def collect_perf(bm_name, args):
  """generate flamegraphs"""
  heading('Flamegraphs: %s' % bm_name)
  subprocess.check_call(
      ['make', bm_name,
       'CONFIG=mutrace', '-j', '%d' % multiprocessing.cpu_count()])
  benchmarks = []
  profile_analysis = []
  cleanup = []
  for line in subprocess.check_output(['bins/mutrace/%s' % bm_name,
                                       '--benchmark_list_tests']).splitlines():
    link(line, '%s.svg' % fnize(line))
    benchmarks.append(
        jobset.JobSpec(['perf', 'record', '-o', '%s-perf.data' % fnize(line),
                        '-g', '-F', '997',
                        'bins/mutrace/%s' % bm_name,
                        '--benchmark_filter=^%s$' % line,
                        '--benchmark_min_time=10'],
                        shortname='perf-%s' % fnize(line)))
    profile_analysis.append(
        jobset.JobSpec(['tools/run_tests/performance/process_local_perf_flamegraphs.sh'],
                       environ = {
                           'PERF_BASE_NAME': fnize(line),
                           'OUTPUT_DIR': 'reports',
                           'OUTPUT_FILENAME': fnize(line),
                       },
                       shortname='flame-%s' % fnize(line)))
    cleanup.append(jobset.JobSpec(['rm', '%s-perf.data' % fnize(line)]))
    cleanup.append(jobset.JobSpec(['rm', '%s-out.perf' % fnize(line)]))
    # periodically flush out the list of jobs: temporary space required for this
    # processing is large
    if len(benchmarks) >= 20:
      # run up to half the cpu count: each benchmark can use up to two cores
      # (one for the microbenchmark, one for the data flush)
      jobset.run(benchmarks, maxjobs=1)
      jobset.run(profile_analysis, maxjobs=multiprocessing.cpu_count())
      jobset.run(cleanup, maxjobs=multiprocessing.cpu_count())
      benchmarks = []
      profile_analysis = []
      cleanup = []
  # run the remaining benchmarks that weren't flushed
  if len(benchmarks):
    jobset.run(benchmarks, maxjobs=1)
    jobset.run(profile_analysis, maxjobs=multiprocessing.cpu_count())
    jobset.run(cleanup, maxjobs=multiprocessing.cpu_count())

def run_summary(bm_name, cfg, base_json_name):
  subprocess.check_call(
      ['make', bm_name,
       'CONFIG=%s' % cfg, '-j', '%d' % multiprocessing.cpu_count()])
  cmd = ['bins/%s/%s' % (cfg, bm_name),
         '--benchmark_out=%s.%s.json' % (base_json_name, cfg),
         '--benchmark_out_format=json']
  if args.summary_time is not None:
    cmd += ['--benchmark_min_time=%d' % args.summary_time]
  return subprocess.check_output(cmd)

def collect_summary(bm_name, args):
  heading('Summary: %s [no counters]' % bm_name)
  text(run_summary(bm_name, 'opt', bm_name))
  heading('Summary: %s [with counters]' % bm_name)
  text(run_summary(bm_name, 'counters', bm_name))
  if args.bigquery_upload:
    with open('%s.csv' % bm_name, 'w') as f:
      f.write(subprocess.check_output(['tools/profiling/microbenchmarks/bm2bq.py',
                                       '%s.counters.json' % bm_name,
                                       '%s.opt.json' % bm_name]))
    subprocess.check_call(['bq', 'load', 'microbenchmarks.microbenchmarks', '%s.csv' % bm_name])

collectors = {
  'latency': collect_latency,
  'perf': collect_perf,
  'summary': collect_summary,
}

argp = argparse.ArgumentParser(description='Collect data from microbenchmarks')
argp.add_argument('-c', '--collect',
                  choices=sorted(collectors.keys()),
                  nargs='*',
                  default=sorted(collectors.keys()),
                  help='Which collectors should be run against each benchmark')
argp.add_argument('-b', '--benchmarks',
                  choices=bm_constants._AVAILABLE_BENCHMARK_TESTS,
                  default=bm_constants._AVAILABLE_BENCHMARK_TESTS,
                  nargs='+',
                  type=str,
                  help='Which microbenchmarks should be run')
argp.add_argument('--bigquery_upload',
                  default=False,
                  action='store_const',
                  const=True,
                  help='Upload results from summary collection to bigquery')
argp.add_argument('--summary_time',
                  default=None,
                  type=int,
                  help='Minimum time to run benchmarks for the summary collection')
args = argp.parse_args()

try:
  for collect in args.collect:
    for bm_name in args.benchmarks:
      collectors[collect](bm_name, args)
finally:
  if not os.path.exists('reports'):
    os.makedirs('reports')
  index_html += "</body>\n</html>\n"
  with open('reports/index.html', 'w') as f:
    f.write(index_html)