#!/bin/bash
#
# Copyright (C) 2015 The Android Open Source Project
#
# 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.
#
# v 1.1-a11
#
set -o nounset
umask 077

#
# Settings
#
LOCAL_SETTING="$HOME/.jack"
TMPDIR=${TMPDIR:=/tmp}
SERVER_DIR=$TMPDIR/jack-$USER

#
# Load local settings
#
source "$LOCAL_SETTING" 2>/dev/null

#
# Create or update local settings if needed
#
if [[ ! -f "$LOCAL_SETTING" || $SETTING_VERSION -lt 2 ]]; then
  echo "Writing local settings in" $LOCAL_SETTING
  cat >"$LOCAL_SETTING.$$" <<-EOT
	# Server settings
	SERVER=${SERVER:=true}
	SERVER_PORT_SERVICE=${SERVER_PORT_SERVICE:=8072}
	SERVER_PORT_ADMIN=${SERVER_PORT_ADMIN:=8073}
	SERVER_COUNT=${SERVER_COUNT:=1}
	SERVER_NB_COMPILE=${SERVER_NB_COMPILE:=4}
	SERVER_TIMEOUT=${SERVER_TIMEOUT:=60}
	SERVER_LOG=\${SERVER_LOG:=\$SERVER_DIR/jack-\$SERVER_PORT_SERVICE.log}
	JACK_VM_COMMAND=\${JACK_VM_COMMAND:=java}
	# Internal, do not touch
	SETTING_VERSION=2
EOT
  ln -f "$LOCAL_SETTING.$$" "$LOCAL_SETTING"
  rm "$LOCAL_SETTING.$$"
  source "$LOCAL_SETTING"
fi

#
# Static setting
#
mkdir "$SERVER_DIR" 2>/dev/null

#
# Decoding argument
#

if [ $# -ne 1 ]
then
        echo "Usage : $0 [ start-server | stop-server | kill-server | list-server | server-log | server-stat ]"
        exit 255
fi

case $1 in
  stop-server)
    echo "Stopping background server"
    CMD="stop" ;;
  server-stat)
    echo "Getting statistic from background server"
    CMD="stat" ;;
  server-log)
    echo "Log location of background server:"
    echo $SERVER_LOG
    exit 0 ;;
  kill-server)
    echo "Killing background server"
    kill $(ps aux | grep JackSimpleServer | grep -v grep | awk '{print $2}')
    exit $? ;;
  list-server)
    ps aux | grep JackSimpleServer | grep -v grep
    exit $? ;;
  start-server)
    SERVER_PRG="$JACK_VM_COMMAND -cp $JACK_JAR com.android.jack.server.JackSimpleServer"
    echo "Launching background server" $SERVER_PRG
    $SERVER_PRG $SERVER_PORT_SERVICE $SERVER_PORT_ADMIN $SERVER_COUNT $SERVER_NB_COMPILE $SERVER_TIMEOUT >>$SERVER_LOG 2>&1 &
    exit 0 ;;
  *)
    echo "Usage : $0 [ start-server | stop-server | kill-server | list-server | server-log | server-stat ]"
    exit 255 ;;
esac

#
# Send command
#

set +o errexit

# Try to cleanup if interrupted
# Cleanup
JACK_EXIT="$SERVER_DIR/admin-$$"
trap 'rm -f "$JACK_EXIT" 2>/dev/null;' EXIT

RETRY_SESSION=3
DELAY_CONNECT=3


# Send command to Jack server
DATE_CONNECT=$(date +%s)
while true; do
  HTTP_CODE=$(curl --fail --silent --output $JACK_EXIT --write-out %{http_code} --connect-timeout 5 --no-proxy 127.0.0.1:$SERVER_PORT_ADMIN http://127.0.0.1:$SERVER_PORT_ADMIN/$CMD)
  CURL_CODE=$?
  if [ $CURL_CODE -eq 0 ]; then
    # No problem, let's go
    break;
  elif [ $CURL_CODE -eq 7 ]; then
    # Failed to connect
    if [ $(date +%s) -ge $DATE_CONNECT ]; then
        echo "No Jack server running"
        exit 255
    else
      sleep 0.2 2>/dev/null
    fi
    # Trying with a new connection, let's retry session 3 times max
    RETRY_SESSION=3
  elif  [ $CURL_CODE -eq 22 ]; then
    # Http code not OK, let's decode and abort
    if [ $HTTP_CODE -eq 401 ]; then
      # 401: Unauthorized
      echo "Security problem, see server log" >&2
      exit 255
    elif [ $HTTP_CODE -eq 400 ]; then
      # 400: Bad request
      echo "Bad request, see server log" >&2
      exit 255
    else
      # Other
      echo "Internal unknown error ($HTTP_CODE), try other ports in ~/.jack, or see server log" >&2
      exit 255
    fi
  else
    # In case of partial, timeout, empty respond, network error, let's retry
    if [ $RETRY_SESSION -eq 0 ]; then
      echo "Communication error with server ($CURL_CODE)" >&2
      exit 255
    else
      let RETRY_SESSION=RETRY_SESSION-1
    fi
  fi
done

# Exit
if [ -r $JACK_EXIT ]; then
  cat <$JACK_EXIT 2>/dev/null
fi

exit 0