#!/bin/sh -e
##  This Source Code Form is subject to the terms of the Mozilla Public
##  License, v. 2.0. If a copy of the MPL was not distributed with this
##  file, You can obtain one at https://mozilla.org/MPL/2.0/.
##
##  Copyright (c) 2007-2020 VMware, Inc. or its affiliates.  All rights reserved.
##

if [ "$RABBITMQ_ENV_LOADED" = 1 ]; then
    return 0;
fi

if [ -z "$RABBITMQ_SCRIPTS_DIR" ]; then
    # We set +e here since since our test for "readlink -f" below needs to
    # be able to fail.
    set +e
    # Determine where this script is really located (if this script is
    # invoked from another script, this is the location of the caller)
    SCRIPT_PATH="$0"
    while [ -h "$SCRIPT_PATH" ] ; do
        # Determine if readlink -f is supported at all. TODO clean this up.
        FULL_PATH=`readlink -f $SCRIPT_PATH 2>/dev/null`
        if [ "$?" != "0" ]; then
          REL_PATH=`readlink $SCRIPT_PATH`
          if expr "$REL_PATH" : '/.*' > /dev/null; then
            SCRIPT_PATH="$REL_PATH"
          else
            SCRIPT_PATH="`dirname "$SCRIPT_PATH"`/$REL_PATH"
          fi
        else
          SCRIPT_PATH=$FULL_PATH
        fi
    done
    set -e

    RABBITMQ_SCRIPTS_DIR=`dirname $SCRIPT_PATH`
fi

_rmq_env_now()
{
    date '+%Y-%m-%d %H:%M:%S'
}

_rmq_env_print()
{
    _rmq_env_tmp="$1"
    _rmq_env_tmp_len="${#_rmq_env_tmp}"
    shift
    printf '%s %s %s\n' "$(_rmq_env_now)" "$_rmq_env_tmp" "$1" 1>&2
    shift
    _rmq_env_print_line=''
    _rmq_env_indent="$((_rmq_env_tmp_len + 21))"
    for _rmq_env_print_line in "$@"
    do
        printf "%${_rmq_env_indent}s%s\n" ' ' "$_rmq_env_print_line" 1>&2
    done
    unset _rmq_env_print_line
    unset _rmq_env_indent
    unset _rmq_env_tmp_len
    unset _rmq_env_tmp
}

_rmq_env_perr()
{
    _rmq_env_print '[error]' "$@"
}

_rmq_env_pwarn()
{
    _rmq_env_print '[warning]' "$@"
}

rmq_realpath() {
    local path=$1

    if [ -d "$path" ]; then
        cd "$path" && pwd
    elif [ -f "$path" ]; then
        cd "$(dirname "$path")" && echo $(pwd)/$(basename "$path")
    else
        echo "$path"
    fi
}

RABBITMQ_HOME="$(rmq_realpath "${RABBITMQ_SCRIPTS_DIR}/..")"
ESCRIPT_DIR="${RABBITMQ_HOME}/escript"

## Set defaults
. ${RABBITMQ_SCRIPTS_DIR}/rabbitmq-defaults

# We save the current value of $RABBITMQ_PID_FILE in case it was set by
# an init script. If $CONF_ENV_FILE overrides it again, we must ignore
# it and warn the user.
saved_RABBITMQ_PID_FILE="$RABBITMQ_PID_FILE"

## Get configuration variables from the configure environment file
[ "x" = "x$RABBITMQ_CONF_ENV_FILE" ] && RABBITMQ_CONF_ENV_FILE="$CONF_ENV_FILE"
if [ -f "$RABBITMQ_CONF_ENV_FILE" ]; then
    CONF_ENV_FILE_PHASE=rabbitmq-env
    . "$RABBITMQ_CONF_ENV_FILE" || true
fi

# Bump ETS table limit to 50000
if [ -z "$ERL_MAX_ETS_TABLES" ]; then
    export ERL_MAX_ETS_TABLES=50000
fi

# Default is defined here:
# https://github.com/erlang/otp/blob/master/erts/emulator/beam/erl_port.h
if [ -z "$ERL_MAX_PORTS" ]; then
    export ERL_MAX_PORTS=65536
fi

[ -n "$ERL_EPMD_PORT" ] && export ERL_EPMD_PORT
[ -n "$ERL_EPMD_ADDRESS" ] && export ERL_EPMD_ADDRESS

DEFAULT_SCHEDULER_BIND_TYPE="db"
[ -n "$SCHEDULER_BIND_TYPE" ] || SCHEDULER_BIND_TYPE="$DEFAULT_SCHEDULER_BIND_TYPE"
[ -n "$RABBITMQ_SCHEDULER_BIND_TYPE" ] || RABBITMQ_SCHEDULER_BIND_TYPE="$SCHEDULER_BIND_TYPE"

DEFAULT_DISTRIBUTION_BUFFER_SIZE=128000
[ -n "$DISTRIBUTION_BUFFER_SIZE" ] || DISTRIBUTION_BUFFER_SIZE="$DEFAULT_DISTRIBUTION_BUFFER_SIZE"
[ -n "$RABBITMQ_DISTRIBUTION_BUFFER_SIZE" ] || RABBITMQ_DISTRIBUTION_BUFFER_SIZE="$DISTRIBUTION_BUFFER_SIZE"

DEFAULT_MAX_NUMBER_OF_PROCESSES=1048576
[ -n "$MAX_NUMBER_OF_PROCESSES" ] || MAX_NUMBER_OF_PROCESSES="$DEFAULT_MAX_NUMBER_OF_PROCESSES"
[ -n "$RABBITMQ_MAX_NUMBER_OF_PROCESSES" ] || RABBITMQ_MAX_NUMBER_OF_PROCESSES="$MAX_NUMBER_OF_PROCESSES"

DEFAULT_MAX_NUMBER_OF_ATOMS=5000000
[ -n "$MAX_NUMBER_OF_ATOMS" ] || MAX_NUMBER_OF_ATOMS="$DEFAULT_MAX_NUMBER_OF_ATOMS"
[ -n "$RABBITMQ_MAX_NUMBER_OF_ATOMS" ] || RABBITMQ_MAX_NUMBER_OF_ATOMS="$MAX_NUMBER_OF_ATOMS"

DEFAULT_SCHEDULER_BUSY_WAIT_THRESHOLD=none
[ -n "$SCHEDULER_BUSY_WAIT_THRESHOLD" ] || SCHEDULER_BUSY_WAIT_THRESHOLD="$DEFAULT_SCHEDULER_BUSY_WAIT_THRESHOLD"
[ -n "$RABBITMQ_SCHEDULER_BUSY_WAIT_THRESHOLD" ] || RABBITMQ_SCHEDULER_BUSY_WAIT_THRESHOLD="$SCHEDULER_BUSY_WAIT_THRESHOLD"

## Common server defaults
SERVER_ERL_ARGS="+pc unicode +P $RABBITMQ_MAX_NUMBER_OF_PROCESSES +t $RABBITMQ_MAX_NUMBER_OF_ATOMS +stbt $RABBITMQ_SCHEDULER_BIND_TYPE +zdbbl $RABBITMQ_DISTRIBUTION_BUFFER_SIZE +sbwt $RABBITMQ_SCHEDULER_BUSY_WAIT_THRESHOLD +sbwtdcpu $RABBITMQ_SCHEDULER_BUSY_WAIT_THRESHOLD +sbwtdio $RABBITMQ_SCHEDULER_BUSY_WAIT_THRESHOLD"

##--- Set environment vars RABBITMQ_<var_name> to defaults if not set

[ "x" = "x$RABBITMQ_CTL_ERL_ARGS" ] && RABBITMQ_CTL_ERL_ARGS="$CTL_ERL_ARGS"
[ "x" = "x$RABBITMQ_CTL_DIST_PORT_MIN" ] && RABBITMQ_CTL_DIST_PORT_MIN="$CTL_DIST_PORT_MIN"
[ "x" = "x$RABBITMQ_CTL_DIST_PORT_MAX" ] && RABBITMQ_CTL_DIST_PORT_MAX="$CTL_DIST_PORT_MAX"
[ "x" = "x$RABBITMQ_CTL_DIST_PORT_MIN" ] && RABBITMQ_CTL_DIST_PORT_MIN='35672'
[ "x" = "x$RABBITMQ_CTL_DIST_PORT_MAX" ] && RABBITMQ_CTL_DIST_PORT_MAX="$(($RABBITMQ_CTL_DIST_PORT_MIN + 10))"

[ "x" = "x$RABBITMQ_SERVER_ERL_ARGS" ] && RABBITMQ_SERVER_ERL_ARGS=${SERVER_ERL_ARGS}
[ "x" = "x$RABBITMQ_SERVER_START_ARGS" ] && RABBITMQ_SERVER_START_ARGS=${SERVER_START_ARGS}
[ "x" = "x$RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS" ] && RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS=${SERVER_ADDITIONAL_ERL_ARGS}
[ "x" = "x$RABBITMQ_SERVER_CODE_PATH" ] && RABBITMQ_SERVER_CODE_PATH=${SERVER_CODE_PATH}
[ "x" = "x$RABBITMQ_IGNORE_SIGINT" ] && RABBITMQ_IGNORE_SIGINT="true"
[ "xtrue" = "x$RABBITMQ_IGNORE_SIGINT" ] && RABBITMQ_IGNORE_SIGINT_FLAG="+B i"

if [ -n "$saved_RABBITMQ_PID_FILE" ] && \
    [ "$saved_RABBITMQ_PID_FILE" != "$RABBITMQ_PID_FILE" ]
then
    _rmq_env_pwarn 'RABBITMQ_PID_FILE was already set by the init script to:' \
        "$saved_RABBITMQ_PID_FILE" \
        'The value set in rabbitmq-env.conf is ignored because it would break the init script.'

    RABBITMQ_PID_FILE="$saved_RABBITMQ_PID_FILE"
fi

[ "x" = "x$RABBITMQ_BOOT_MODULE" ] && RABBITMQ_BOOT_MODULE=${BOOT_MODULE}

##--- End of overridden <var_name> variables

_rmq_env_set_erl_libs()
{
    if [ -n "$ERL_LIBS" ]
    then
        export ERL_LIBS="$RABBITMQ_HOME/plugins:$ERL_LIBS"
    else
        export ERL_LIBS="$RABBITMQ_HOME/plugins"
    fi
}

run_escript()
{
    escript_main="${1:?escript_main must be defined}"
    shift
    escript="${1:?escript must be defined}"
    shift

    _rmq_env_set_erl_libs

    # Important: do not quote RABBITMQ_CTL_ERL_ARGS as they must be
    # word-split
    # shellcheck disable=SC2086
    exec erl +B \
        -boot "$CLEAN_BOOT_FILE" \
        -noinput -noshell -hidden -smp enable \
        $RABBITMQ_CTL_ERL_ARGS \
        -kernel inet_dist_listen_min "$RABBITMQ_CTL_DIST_PORT_MIN" \
        -kernel inet_dist_listen_max "$RABBITMQ_CTL_DIST_PORT_MAX" \
        -run escript start \
        -escript main "$escript_main" \
        -extra "$escript" "$@"
}

RABBITMQ_ENV_LOADED=1

# Since we source this elsewhere, don't accidentally stop execution
true
