#!/bin/sh

set -eu

# this script is for development/test runs only
# defaults: stackoverflow.com/a/16753536
jobfile="${1:-/tmp/sdns-profiler-job-pids}"
runtime="${1:-node}";
profiler="${2:-$1}";
waitsec="${3:-0}";
qdoh="${QDOH:-invalid}";
prestart=""
proc0=""

echo "run $runtime";

# patorjk.com/software/taag/#p=display&c=echo&f=Small%20Slant&t=r-profiler
profilerbanner() {
  echo "                              ___ _  __         ";
  echo "  ____ ____ ___   ____ ___   / _/(_)/ /___  ____";
  echo " / __//___// _ \ / __// _ \ / _// // // -_)/ __/";
  echo "/_/       / .__//_/   \___//_/ /_//_/ \__//_/   ";
  echo "         /_/                                    ";
}

# patorjk.com/software/taag/#p=display&c=echo&f=Small%20Slant&t=rethinkdns
banner() {
  echo "             __   __    _        __       __         ";
  echo "  ____ ___  / /_ / /   (_)___   / /__ ___/ /___   ___";
  echo " / __// -_)/ __// _ \ / // _ \ /  '_// _  // _ \ (_-<";
  echo "/_/   \__/ \__//_//_//_//_//_//_/\_\ \_,_//_//_//___/";
  echo "                                                     ";
}

cleanup() {
  # alt? unix.stackexchange.com/a/146770
  # echo "sig... $proc0"
  # kill -INT $proc0
  # stackoverflow.com/a/51576504
  jobs -p > jobfile
  j=$(cat jobfile)
  echo "kill... $j"
  kill -INT $j || true
  # does not work... jobs -p | xargs -r kill -9
  rm jobfile
}
# davidpashley.com/articles/writing-robust-shell-scripts
trap cleanup INT TERM EXIT

bgcmd() {
  $1 &
}

bgsilent() {
  $1 >/dev/null 2>&1 &
}

dohquery() {
  domain=$1
  resolver="https://localhost:8080/"
  pstart="${qdoh} -i -t A -s ${resolver} -q ${domain}"
  bgsilent "$pstart"
}

reqs() {
  while true
  do

    prefix=$( dd if=/dev/urandom bs=20 count=20 status=none | tr -dc 'A-Z0-9' | xargs echo )
    domain="${prefix}.dnsleaktest.com"
    dohquery ${domain}

    if [ $1 != "0" ]; then
      sleep $1
    fi

  done
}

greqs() {
  while true
  do
    dohquery google.co.pk
    dohquery google.co.in
    dohquery google.com
    dohquery google.co.uk

    if [ $1 != "0" ]; then
      sleep $1
    fi

  done
}

if [ $runtime = "help" ] || [ $runtime = "h" ]; then
  echo "note: make sure node / deno / wrangler are in path";
  echo "usage: $0 [node|deno|workers] [[p1|p2] [waitsec]]";
  exit 0;
fi

if [ $runtime = "deno" ] || [ $runtime = "d" ]; then
  echo "note: deno v1.17+ required";
  echo "using `which deno`";
  start="deno run --unstable \
           --allow-env \
           --allow-net \
           --allow-read \
           --allow-write \
           src/server-deno.ts";
elif [ $runtime = "workers" ] || [ $runtime = "w" ]; then
  echo "note: wrangler v1.16+ required";
  echo "using `which wrangler`";
  start="npx wrangler dev --local";
elif [ $runtime = "fastly" ] || [ $runtime = "f" ]; then
  echo "note: Fastly CLI required";
  echo "using `which fastly`";
  # developer.fastly.com/learning/compute/testing/#starting-the-server
  start="fastly compute serve --skip-verification --verbose --file ./dist/fastly.wasm";
elif [ $runtime = "fly" ] || [ $runtime = "ff" ]; then
  prestart="npm run build:fly"
  export NODE_OPTIONS="--trace-warnings --max-old-space-size=320 --heapsnapshot-signal=SIGUSR2 --heapsnapshot-near-heap-limit=2"
  start="node ./dist/fly.mjs"
else
  echo "note: nodejs v19+ required";
  echo "using `which node`";
  # verbose: NODE_DEBUG=http2,http,tls,net... ref: stackoverflow.com/a/46858827
  export NODE_OPTIONS="--trace-warnings --max-old-space-size=320 --heapsnapshot-signal=SIGUSR2 --heapsnapshot-near-heap-limit=2"
  start="node ./src/server-node.js";
fi

# prestart ceremony, if any
if [ ! -z "$prestart" ]; then
  $prestart
fi

# prevent stdin from early close on signals?
# unix.stackexchange.com/a/672061

if [ $profiler = "cpu" ]; then
  if [ $runtime != "node" ] && [ $runtime != "n" ]; then
    echo "profiler (cpu): only on node"
    exit 1
  fi

  echo "profiler (cpu): running clinicjs flame";
  echo "profiler (cpu): press ctrl+c to open cpu flame graphs in a browser";
  profilerbanner;
  npx clinic flame -- $start
  proc0=$!
elif [ $profiler = "mem" ]; then
  if [ $runtime != "node" ] && [ $runtime != "n" ]; then
    echo "profiler (mem): only on node"
    exit 1
  fi

  echo "profiler (mem): running clinicjs heapprofile"
  echo "profiler (mem): press ctrl+c to open memory flame graphs in a browser"
  profilerbanner;
  npx clinic heapprofiler -- $start
  proc0=$!
elif [ $profiler = "fn" ]; then
  if [ $runtime != "node" ] && [ $runtime != "n" ]; then
    echo "profiler (fn): only on node"
    exit 1
  fi

  echo "profiler (fn): running clinicjs bubbleprof"
  echo "profiler (fn): press ctrl+c to open func bubble graphs in a browser"
  profilerbanner;
  npx clinic bubbleprof -- $start
  proc0=$!
elif [ $profiler = "profile1" ] || [ $profiler = "p1" ]; then
  if [ $qdoh = "invalid" ]; then
    echo "Specify env QDOH path"
    exit 1
  fi

  echo "profiler: running doh with fetch";
  profilerbanner;
  DISABLE_BLOCKLISTS=true \
    PROFILE_DNS_RESOLVES=true \
    NODE_DOH_ONLY=true \
    NODE_AVOID_FETCH=false \
    LOG_LEVEL=warn \
    $start &
  proc0=$!
  sleep 1
  reqs "$waitsec" &
elif [ $profiler = "profile2" ] || [ $profiler = "p2" ]; then
  if [ ${qdoh} = "invalid" ]; then
    echo "Specify env QDOH path"
    exit 1
  fi

  echo "profiler: running non-fetch doh";
  profilerbanner;
  DISABLE_BLOCKLISTS=true \
    PROFILE_DNS_RESOLVES=true \
    NODE_DOH_ONLY=true \
    NODE_AVOID_FETCH=true \
    LOG_LEVEL=warn \
    $start &
  proc0=$!
  sleep 1
  reqs "$waitsec" &
elif [ $profiler = "profile3" ] || [ $profiler = "p3" ]; then
  if [ ${qdoh} = "invalid" ]; then
    echo "Specify env QDOH path"
    exit 1
  fi
  if [ $runtime != "node" ] && [ $runtime != "n" ]; then
    echo "Profile3 only valid on Node"
    exit 1
  fi

  echo "profiler: running podns";
  profilerbanner;
  DISABLE_BLOCKLISTS=true \
    PROFILE_DNS_RESOLVES=true \
    NODE_DOH_ONLY=false \
    LOG_LEVEL=warn \
    $start &
  proc0=$!
  sleep 1
  reqs "$waitsec" &
else
  banner;
  bgcmd "$start"
  proc0=$!
fi

# list all bg jobs
jobs -l
# wait for the main job to finish
wait $proc0