#!/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.
#
# Version: 1.1
#
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

#
# If not in server mode, exec jack
#
if [ "$SERVER" != "true" ]; then
  exec $JACK_VM_COMMAND -cp $JACK_JAR com.android.jack.Main "$@"
  echo "ERROR: Cannot succeed to launch Jack without Jack server" >&2
  exit 255
fi

#
# Static setting
#
SERVER_PRG="$JACK_VM_COMMAND -cp $JACK_JAR com.android.jack.server.JackSimpleServer"

#
# Prepare compilation
#
JACK_DIR="$SERVER_DIR/jack-task-$$/"
JACK_OUT="$JACK_DIR/out"
JACK_ERR="$JACK_DIR/err"
JACK_CLI="$JACK_DIR/cli"
JACK_EXIT="$JACK_DIR/exit"
JACK_PWD="$PWD"

mkdir "$SERVER_DIR" 2>/dev/null

# Cleanup
trap 'rm -f "$JACK_OUT" "$JACK_ERR" "$JACK_CLI" "$JACK_EXIT" 2>>$SERVER_LOG; rmdir "$JACK_DIR" 2>>$SERVER_LOG' EXIT

set -o errexit

# Create fifos and files for a task
mkdir  "$JACK_DIR"
mkfifo "$JACK_OUT"
mkfifo "$JACK_ERR"
touch  "$JACK_CLI" "$JACK_EXIT"

# Try to cleanup if interrupted
abort () { echo $(uptime) >>$SERVER_LOG; kill -9 $PID_OUT $PID_ERR 2>>$SERVER_LOG; wait $PID_OUT $PID_ERR 2>>$SERVER_LOG; exit 255; }
trap 'abort' SIGHUP SIGINT SIGQUIT SIGTERM ERR

# Redirect output and error
cat <"$JACK_OUT" >&1 &
PID_OUT=$!
cat <"$JACK_ERR" >&2 &
PID_ERR=$!

# Prepare the working directory and command line
echo -n \"$PWD\" "" >"$JACK_CLI"
for i in "$@"; do
  echo -n \"$i\" "" >>"$JACK_CLI"
done
echo >>"$JACK_CLI"

#
# Launch the compilation
#

set +o errexit
trap ERR

RETRY_LAUNCH=1
RETRY_SESSION=3
DELAY_CONNECT=30


# Launch compilation
DATE_CONNECT=$(date +%s)
while true; do
  CURL_TIME=$(date +%H:%M:%S)
  HTTP_CODE=$(curl --fail --silent --data @- --output "$JACK_EXIT" --write-out %{http_code} --connect-timeout 10 --no-proxy 127.0.0.1:$SERVER_PORT_SERVICE http://127.0.0.1:$SERVER_PORT_SERVICE/jack <<< "+ $JACK_OUT $JACK_ERR $JACK_CLI")
  CURL_CODE=$?
  JACK_CODE=$(cat "$JACK_EXIT")
  echo "CURL: $$ - $CURL_TIME - $CURL_CODE - $HTTP_CODE - $JACK_CODE" >>$SERVER_LOG
  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
      if [ $RETRY_LAUNCH -eq 0 ]; then
        echo "ERROR: Cannot launch Jack server" >&2
        abort
      else
        let RETRY_LAUNCH=RETRY_LAUNCH-1
        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 &
        # New server, let's try a bit to connect
        let DATE_CONNECT=$(date +%s)+$DELAY_CONNECT;
      fi
    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 [ $HTTP_CODE -eq 401 ]; then
      # 401: Unauthorized
      echo "ERROR: Security problem, see Jack server log ($SERVER_LOG)" >&2
      abort
    elif [ $HTTP_CODE -eq 400 ]; then
      # 400: Bad request
      echo "ERROR: Bad request, see Jack server log ($SERVER_LOG)" >&2
      abort
    else
      # Other
      echo "ERROR: Internal unknown error ($HTTP_CODE), try other ports in ~/.jack, or see Jack server log ($SERVER_LOG)" >&2
      abort
    fi
  else
    # In case of partial, timeout, empty respond, network error, let's retry
    if [ $RETRY_SESSION -eq 0 ]; then
      echo "ERROR: Communication error with Jack server ($CURL_CODE)" >&2
      abort
    else
      let RETRY_SESSION=RETRY_SESSION-1
    fi
  fi
done

# Wait for termination
wait $PID_OUT
wait $PID_ERR

# Exit
exit $JACK_CODE