#!/bin/bash
# Copyright 2019 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

#### CATEGORY=Build
### Collect Ninja trace information for analysis in chrome://tracing

## Usage: fx ninjatrace2json
##
## Use this after a build to write "ninjatrace.json" in the build directory.

set -e

source "$(cd "$(dirname "${BASH_SOURCE[0]}")" > /dev/null 2>&1 && pwd)"/lib/vars.sh || exit $?
fx-config-read

function usage() {
  cat << EOF
Use this after a build to write "ninjatrace.json" in the build directory.
See https://fuchsia.dev/internal/intree/concepts/build-performance?hl=en#build-performance-analysis-as-a-trace.

fx ninjatrace2json [options]

Options:
  --help|-h: print this help and exit
  --rbe-rpl-path: when provided, interleave remote execution stats from RBE into
      the main trace
EOF
}

rbe_rpl_path=''
# Extract script options before --
for opt; do
  # handle --option arg
  if test -n "$prev_opt"; then
    eval "$prev_opt"=\$opt
    prev_opt=
    shift
    continue
  fi
  # Extract optarg from --opt=optarg
  case "$opt" in
    *=?*) optarg=$(expr "X$opt" : '[^=]*=\(.*\)') ;;
    *=) optarg= ;;
  esac
  case "$opt" in
    --help | -h)
      usage
      exit
      ;;
    --rbe-rpl-path=*) rbe_rpl_path="$optarg" ;;
    --rbe-rpl-path) prev_opt='rbe_rpl_path' ;;
    *)
      echo "Unknown option ${opt}"
      usage
      exit 1
      ;;
  esac
  shift
done

test -z "$prev_opt" || {
  echo "Option is missing argument to set $prev_opt."
  exit 1
}

TMP_DIR="$(mktemp -d)"
readonly TMP_DIR
trap 'rm -rf "${TMP_DIR}"' EXIT

"${PREBUILT_NINJA}" -C "${FUCHSIA_BUILD_DIR}" -t compdb > "${TMP_DIR}/compdb.json"
"${PREBUILT_NINJA}" -C "${FUCHSIA_BUILD_DIR}" -t graph > "${TMP_DIR}/graph.dot"

ninjatrace_args=(
  -ninjalog "${FUCHSIA_BUILD_DIR}/.ninja_log"
  -compdb "${TMP_DIR}/compdb.json"
  -graph "${TMP_DIR}/graph.dot"
  -trace-json "${FUCHSIA_BUILD_DIR}/ninjatrace.json"
  -critical-path
)

test -z "${rbe_rpl_path}" || {
  ninjatrace_args+=(
    -rbe-rpl-path "${rbe_rpl_path}"
    '-rpl2trace-path' "${PREBUILT_RECLIENT_DIR}/rpl2trace"
  )
}

"${HOST_OUT_DIR}/ninjatrace" "${ninjatrace_args[@]}"

echo "Now visit chrome://tracing and load ${FUCHSIA_BUILD_DIR}/ninjatrace.json"