#!/bin/sh

# PROVIDE: cardano_db_sync
# REQUIRE: DAEMON cardano_node postgresql
# KEYWORD: shutdown
#
# Add the following lines to /etc/rc.conf to enable this service:
#
# cardano_db_sync_enable:          Set to YES to enable cardano_db_sync.
#                               Default: "NO"
#
# cardano_db_sync_jail_enable:     Set to YES to run the service in a minimal jail.
#                               Default: "NO"
#
# cardano_db_sync_net:             A network name to connect to.
#                               Default: "mainnet"
#
# cardano_db_sync_home:            An absolute path to the daemon home directory.
#                               The directory will be created if not exists.
#                               Default: "/var/db/cardano_db_sync"
#
# cardano_db_sync_cnode_socket:    An absolute path to the cardano-node socket file.
#                               Default: "/var/db/cardano_node/cardano-node.sock"
#
# Advanced settings that usually don't need to be changed for simple usage cases:
#
# cardano_db_sync_pgpass:          An absolute path to the PostgreSQL ".pgpass" connection file.
#                               Default: "${cardano_db_sync_home}/${cardano_db_sync_net}-configs/.pgpass"
#
# cardano_db_sync_config:          An absolute path to the db-sync configuration JSON file.
#                               Default: "${cardano_db_sync_home}/${cardano_db_sync_net}-configs/db-sync-config.json"
#
# cardano_db_sync_schema:          An absolute path to the db-sync schema directory.
#                               Default: "%%LOCALBASE%%/share/cardano-db-sync/schema"
#
# cardano_db_sync_flags:           Any additional command line flags to pass to cardano_db_sync.
#                               Default: ""
#

. /etc/rc.subr

name=cardano_db_sync
desc="Cardano DB-Sync daemon"
rcvar="cardano_db_sync_enable"
command=%%PREFIX%%/bin/cardano-db-sync

cardano_deployment_url="https://raw.githubusercontent.com/cardano-bsd-alliance/freebsd-ports-cardano-artifacts/master/cardano-db-sync"
cardano_config_files="config db-sync-config byron-genesis shelley-genesis alonzo-genesis conway-genesis"
cardano_networks="mainnet preview preprod"

start_cmd="cardano_db_sync_start"
start_precmd="cardano_db_sync_prestart"
stop_cmd="cardano_db_sync_stop"
status_cmd="cardano_db_sync_status"
fetch_cmd="cardano_db_sync_fetch"

extra_commands="status fetch"

load_rc_config $name
: ${cardano_db_sync_enable:=NO}
: ${cardano_db_sync_jail_enable:=NO}
: ${cardano_db_sync_net:="mainnet"}
: ${cardano_db_sync_home:="/var/db/cardano_db_sync"}
: ${cardano_db_sync_cnode_socket:="/var/db/cardano_node/cardano-node.sock"}
: ${cardano_db_sync_pgpass:="${cardano_db_sync_home}/${cardano_db_sync_net}-configs/.pgpass"}
: ${cardano_db_sync_config:="${cardano_db_sync_home}/${cardano_db_sync_net}-configs/db-sync-config.json"}
: ${cardano_db_sync_schema:="%%PREFIX%%/share/cardano-db-sync/schema"}
: ${cardano_db_sync_flags:=""}

cardano_db_sync_state="${cardano_db_sync_home}/${cardano_db_sync_net}-state"

# aliases
_home=${cardano_db_sync_home}
_net=${cardano_db_sync_net}
_socket=${cardano_db_sync_cnode_socket}
_pgpass=${cardano_db_sync_pgpass}
_config=${cardano_db_sync_config}
_schema=${cardano_db_sync_schema}
_state=${cardano_db_sync_state}
_flags=${cardano_db_sync_flags}

jail_schema="/schema"
jail_config="/${_net}-configs/`basename ${_config}`"
jail_pgpass="/${_net}-configs/`basename ${_pgpass}`"
jail_socket="/socket/`basename ${_socket}`"
jail_state="/${_net}-state"
jail_args="name=cardano_db_sync_jail exec.jail_user=cardano exec.system_jail_user host=inherit"
jail_command=/bin/cardano-db-sync

jail_root="${_home}/jail"
jail_copy_resolv_conf=yes
jail_copy_services=yes
jail_copy_programs="$command /usr/sbin/nologin /bin/sh %%LOCALBASE%%/bin/psql"
jail_ip_inherit=yes
jail_prepare_inside_cmds="mkdir ./tmp ;\
                          chmod +s ./bin/cardano-db-sync"
jail_nullfs_mounts="`dirname ${_config}` ./${_net}-configs ro \
                    ${_schema} ./schema ro \
                    ${_state} ./${_net}-state ro"

if checkyesno "cardano_db_sync_jail_enable"; then
    export PGPASSFILE=${jail_pgpass}
    _schema_arg="${jail_schema}"
    _state_arg="${jail_state}"
    _socket_arg="${jail_socket}"
    _config_arg="${jail_config}"
    # We need to override ${command} to make check_pidfile work correctly when
    # rc.subr calls it as "check_pidfile ${pidfile} ${command}"
    command=/usr/sbin/jail
else
    export PGPASSFILE=${_pgpass}
    _schema_arg="${_schema}"
    _state_arg="${_state}"
    _socket_arg="${_socket}"
    _config_arg="${_config}"
fi

pidfile="/var/run/cardano-db-sync.pid"
flags=" --schema-dir ${_schema_arg} \
        --state-dir ${_state_arg} \
        --socket-path ${_socket_arg} \
        --config ${_config_arg} \
        ${_flags}"

. %%LOCALBASE%%/share/rc-subr-jail/rc.subr.jail

# dirname_realpath path
# Return an absolute dirname for a given path
# Correctly handles symlinks pointing to a non-existant files
dirname_realpath()
{
    local _path _dirname _realpath
    _path=$1
    _dirname=$(dirname ${_path})

    _realpath=$(/bin/sh -c "cd $_dirname && readlink ${_path}" 2> /dev/null)
    if [ $? = "0" ]; then
        _dirname=$(dirname ${_realpath})
        if [ $_dirname == "." ]; then
            echo $(dirname ${_path})
        else
            echo $(/bin/sh -c "cd ${_dirname} && pwd" 2> /dev/null)
        fi
        return 0
    fi
    echo $(dirname ${_path})
}

sanity_check()
{
    if [ ! -f ${_config} ]; then
        echo "Invalid value for cardano_db_sync_config: missing file ${_config}"
        echo "You might want to run service cardano_db_sync onefetch"
        exit 1
    fi
    if [ ! -f ${_pgpass} ]; then
        echo "Invalid value for cardano_db_sync_pgpass: missing file ${_pgpass}"
        echo "Did you setup postgresql database access?"
        exit 1
    fi
    if [ ! \( -L ${_socket} -o -S ${_socket} \) ]; then
        echo "Invalid value for cardano_db_sync_cnode_socket: ${_socket} is not a socket or a symlink"
        echo "cardano_node might be not running and/or wrong path specified for the socket file"
        exit 1
    fi
    if [ ! -d `dirname ${_schema}` ]; then
        echo "The directory for the database schema ${_schema} is missing"
        exit 1
    fi
    return 0
}

cardano_db_sync_prestart()
{
    # Create cardano_db_sync home directory, if not exists
    if [ ! -d "${_home}" ]; then
        mkdir -p "${_home}"
        chown cardano:cardano "${_home}"
    fi
    # Create cardano_db_sync state directory, if not exists
    if [ ! -d "${_state}" ]; then
        mkdir -p "${_state}"
        chown cardano:cardano "${_state}"
    fi

    sanity_check
}

cardano_db_sync_start()
{
    check_startmsgs && echo "Starting ${name}."

    local _socketdir=$(dirname_realpath ${_socket})
    jail_nullfs_mounts="$jail_nullfs_mounts ${_socketdir} ./socket ro"

    if checkyesno "cardano_db_sync_jail_enable"; then
        prepare_jail $jail_root
        if [ "$?" != "0" ]; then
            echo "Failed to start ${name}: jail creation error"
            return 1
        fi

        cd ${_home} && /bin/sh -c "/usr/sbin/daemon -p $pidfile -S -T cardano-db-sync \
            ${command} -c ${jail_prepared_args} ${jail_args} command=${jail_command} ${flags}"
    else
        cd ${_home} && /usr/bin/env "PATH=${PATH}:%%LOCALBASE%%/bin" /usr/sbin/daemon -p $pidfile -S -T cardano-db-sync \
            ${command} ${flags}
    fi
}

cardano_db_sync_stop()
{
    local _ret
    local _socketdir=$(dirname_realpath ${_socket})
    jail_nullfs_mounts="$jail_nullfs_mounts ${_socketdir} ./socket ro"

    pid=$(check_pidfile "${pidfile}" "$command")

    if [ -z "${pid}" ]
    then
        echo "${name} is not running"
        _ret=1
    else
        echo "Stopping ${name}."
        kill_jail "$pid" -INT "cardano_db_sync_jail_enable"
        wait_for_pids "$pid"
        _ret=0
    fi

    if checkyesno "cardano_db_sync_jail_enable"; then
            destroy_jail $jail_root 2> /dev/null
    fi
}

cardano_db_sync_status()
{
    pid=$(check_pidfile "${pidfile}" "$command")

    if [ -z "${pid}" ]
    then
        echo "${name} is not running"
        return 1
    else
        echo ${name} is running as pid $pid
    fi
}

cardano_db_sync_fetch()
{
    for net in ${cardano_networks}
    do
        echo "Fetching configuration files for ${net}"
        mkdir -p "${_home}/${net}-configs"
        /usr/bin/apply "/usr/bin/fetch -a -o \
        ${_home}/${net}-configs ${cardano_deployment_url}/${net}-configs/%1.json" $cardano_config_files
        chown -R cardano:cardano "${_home}/${net}-configs"
    done
}


run_rc_command "$1"