run_firestore_emulator.sh

#!/bin/bash

# Copyright 2019 Google LLC
#
# 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.

# USAGE: run_firestore_emulator.sh { run | start | stop }
#
# Downloads and runs the Firestore emulator

set -euo pipefail

VERSION='1.10.4'
FILENAME="cloud-firestore-emulator-v${VERSION}.jar"
URL="https://storage.googleapis.com/firebase-preview-drop/emulator/${FILENAME}"

cache_dir="${HOME}/.cache/firebase/emulators"
jar="${cache_dir}/${FILENAME}"

cd$(git rev-parse --show-toplevel)
pid_file="cloud-firestore-emulator.pid"
log_file="cloud-firestore-emulator.log"

functionhelp() {
 cat 1>&2<<EOF
run_firestore_emulator.sh {run|start|stop}
EOF
}

# Downloads the emulator jar if it doesn't already exist
functionensure_exists() {
if [[ !-f"$jar" ]];then
echo"Downloading Firestore emulator"1>&2
 mkdir -p "${cache_dir}"
 curl -s -o "${jar}""${URL}"
fi
}

# Runs the emulator synchronously
functionrun() {
exec java -jar "$jar""$@"
}

# Verifies the emulator isn't already running at the PID in the pid_file
functioncheck_not_running() {
if [[ -f"${pid_file}" ]];then
 pid=$(cat "${pid_file}")
ifkill -0 "${pid}">& /dev/null;then
echo"Firestore emulator already running as PID ${pid}"1>&2
return 1
fi

echo"Removing stale PID file"1>&2
 rm "${pid_file}"
fi
}

# Starts the emulator in the background
functionstart() {
 check_not_running

 run "$@">&"${log_file}"&
 pid="$!"
echo"$pid">"${pid_file}"
echo"Firestore emulator running as PID ${pid}"1>&2
}

# Stops the emulator if it's running
functionstop() {
if [[ -f"${pid_file}" ]];then
 pid=$(cat "${pid_file}")
kill"${pid}"||true
 rm "${pid_file}"
fi
}

command=run
if [[ $#-gt 0 ]];then
 command="$1"
shift
fi

case"${command}"in
 run)
 ensure_exists
 run "$@"
 ;;

 start)
 ensure_exists
 start
 ;;

 stop)
 stop
 ;;

 download)
 ensure_exists
 ;;

*)
help
exit 1
 ;;
esac