#!/bin/bash

##################################################
# ENV                                            #
# - MONGO_OPTS                                   #
# Mount dir                                      #
# - LOG_DIR                                      #
# - DATA_DIR                                     #
##################################################

set -euo pipefail
export LANG=en_US.UTF-8
trap Quit EXIT

PIDS=
GOT_SIGTERM=
MONGO_OPTS="${MONGO_OPTS:---bind_ip_all}"
LOG_DIR='/var/log/mongo'
DATA_DIR='/var/lib/mongo'

function Print {
    local file=/dev/null
    [ '-f' = "$1" ] && file=$2 && shift && shift
    date +"[%F %T] $*" | tee -a $file
}

function Quit {
    Print killing mongod ...
    mongod --dbpath $DATA_DIR --shutdown || true
    while :; do
        pkill -f mongod && Print killing mongod ... || break
        sleep 1
    done
    Print Container stopped.
    test -n "$GOT_SIGTERM"
}

function Init {
    Print Initing mongod ...
    chown -R mongod:mongod $LOG_DIR $DATA_DIR
    rm -f /tmp/mongodb-27017.sock
}

function StartProc {
    Print Starting mongodb ...
    su - mongod -c "mongod \
        --port 27017 \
        --dbpath $DATA_DIR \
        --unixSocketPrefix /tmp \
        --logpath $LOG_DIR/mongod.log \
        --logappend \
        $MONGO_OPTS" &
    PIDS="$PIDS $!"
    while sleep 1; do
        [ -e /tmp/mongodb-27017.sock ] && break || echo -n .
        [ ! -e /proc/$! ] && echo && Print unexpected error! && exit
    done
    echo && Print Mongodb is ready for connections.
}

function Main {
    local pid=
    Init
    StartProc
    trap "GOT_SIGTERM=1; Print Got SIGTERM ..." SIGTERM
    while [ -z "$GOT_SIGTERM" ] && sleep 1; do
        for pid in $PIDS; do
            [ ! -e /proc/$pid ] && Print Unexpected error! && exit
        done
    done
}

# Start here
Main