# lib/swift
# Functions to control the configuration and operation of the **Swift** service

# Dependencies:
# ``functions`` file
# ``DEST``, ``SCREEN_NAME``, `SWIFT_HASH` must be defined
# ``SWIFT_DATA_DIR`` or ``DATA_DIR`` must be defined
# ``lib/keystone`` file
# ``stack.sh`` calls the entry points in this order:
#
# install_swift
# configure_swift
# init_swift
# start_swift
# stop_swift
# cleanup_swift

# Save trace setting
XTRACE=$(set +o | grep xtrace)
set +o xtrace


# Defaults
# --------

# Set up default directories
SWIFT_DIR=$DEST/swift
SWIFTCLIENT_DIR=$DEST/python-swiftclient
SWIFT_AUTH_CACHE_DIR=${SWIFT_AUTH_CACHE_DIR:-/var/cache/swift}

# TODO: add logging to different location.

# Set ``SWIFT_DATA_DIR`` to the location of swift drives and objects.
# Default is the common DevStack data directory.
SWIFT_DATA_DIR=${SWIFT_DATA_DIR:-${DATA_DIR}/swift}

# Set ``SWIFT_CONFIG_DIR`` to the location of the configuration files.
# Default is ``/etc/swift``.
SWIFT_CONFIG_DIR=${SWIFT_CONFIG_DIR:-/etc/swift}

# DevStack will create a loop-back disk formatted as XFS to store the
# swift data. Set ``SWIFT_LOOPBACK_DISK_SIZE`` to the disk size in bytes.
# Default is 1 gigabyte.
SWIFT_LOOPBACK_DISK_SIZE=${SWIFT_LOOPBACK_DISK_SIZE:-1000000}

# The ring uses a configurable number of bits from a path’s MD5 hash as
# a partition index that designates a device. The number of bits kept
# from the hash is known as the partition power, and 2 to the partition
# power indicates the partition count. Partitioning the full MD5 hash
# ring allows other parts of the cluster to work in batches of items at
# once which ends up either more efficient or at least less complex than
# working with each item separately or the entire cluster all at once.
# By default we define 9 for the partition count (which mean 512).
SWIFT_PARTITION_POWER_SIZE=${SWIFT_PARTITION_POWER_SIZE:-9}

# Set ``SWIFT_REPLICAS`` to configure how many replicas are to be
# configured for your Swift cluster.  By default the three replicas would need a
# bit of IO and Memory on a VM you may want to lower that to 1 if you want to do
# only some quick testing.
SWIFT_REPLICAS=${SWIFT_REPLICAS:-3}
SWIFT_REPLICAS_SEQ=$(seq ${SWIFT_REPLICAS})

# Set ``OBJECT_PORT_BASE``, ``CONTAINER_PORT_BASE``, ``ACCOUNT_PORT_BASE``
# Port bases used in port number calclution for the service "nodes"
# The specified port number will be used, the additinal ports calculated by
# base_port + node_num * 10
OBJECT_PORT_BASE=6010
CONTAINER_PORT_BASE=6011
ACCOUNT_PORT_BASE=6012


# Entry Points
# ------------

# cleanup_swift() - Remove residual data files
function cleanup_swift() {
   rm -f ${SWIFT_CONFIG_DIR}{*.builder,*.ring.gz,backups/*.builder,backups/*.ring.gz}
   if egrep -q ${SWIFT_DATA_DIR}/drives/sdb1 /proc/mounts; then
      sudo umount ${SWIFT_DATA_DIR}/drives/sdb1
   fi
   if [[ -e ${SWIFT_DATA_DIR}/drives/images/swift.img ]]; then
      rm ${SWIFT_DATA_DIR}/drives/images/swift.img
   fi
}

# configure_swift() - Set config files, create data dirs and loop image
function configure_swift() {
    local swift_auth_server
    local node_number
    local swift_node_config
    local swift_log_dir

    setup_develop $SWIFT_DIR

    # Make sure to kill all swift processes first
    swift-init all stop || true

    # First do a bit of setup by creating the directories and
    # changing the permissions so we can run it as our user.

    USER_GROUP=$(id -g)
    sudo mkdir -p ${SWIFT_DATA_DIR}/drives
    sudo chown -R $USER:${USER_GROUP} ${SWIFT_DATA_DIR}

    # Create a loopback disk and format it to XFS.
    if [[ -e ${SWIFT_DATA_DIR}/drives/images/swift.img ]]; then
        if egrep -q ${SWIFT_DATA_DIR}/drives/sdb1 /proc/mounts; then
            sudo umount ${SWIFT_DATA_DIR}/drives/sdb1
        fi
    else
        mkdir -p  ${SWIFT_DATA_DIR}/drives/images
        sudo touch  ${SWIFT_DATA_DIR}/drives/images/swift.img
        sudo chown $USER: ${SWIFT_DATA_DIR}/drives/images/swift.img

        dd if=/dev/zero of=${SWIFT_DATA_DIR}/drives/images/swift.img \
            bs=1024 count=0 seek=${SWIFT_LOOPBACK_DISK_SIZE}
    fi

    # Make a fresh XFS filesystem
    mkfs.xfs -f -i size=1024  ${SWIFT_DATA_DIR}/drives/images/swift.img

    # Mount the disk with mount options to make it as efficient as possible
    mkdir -p ${SWIFT_DATA_DIR}/drives/sdb1
    if ! egrep -q ${SWIFT_DATA_DIR}/drives/sdb1 /proc/mounts; then
        sudo mount -t xfs -o loop,noatime,nodiratime,nobarrier,logbufs=8  \
            ${SWIFT_DATA_DIR}/drives/images/swift.img ${SWIFT_DATA_DIR}/drives/sdb1
    fi

    # Create a link to the above mount and
    # create all of the directories needed to emulate a few different servers
    for node_number in ${SWIFT_REPLICAS_SEQ}; do
        sudo ln -sf ${SWIFT_DATA_DIR}/drives/sdb1/$node_number ${SWIFT_DATA_DIR}/$node_number;
        drive=${SWIFT_DATA_DIR}/drives/sdb1/${node_number}
        node=${SWIFT_DATA_DIR}/${node_number}/node
        node_device=${node}/sdb1
        [[ -d $node ]] && continue
        [[ -d $drive ]] && continue
        sudo install -o ${USER} -g $USER_GROUP -d $drive
        sudo install -o ${USER} -g $USER_GROUP -d $node_device
        sudo chown -R $USER: ${node}
    done

   sudo mkdir -p ${SWIFT_CONFIG_DIR}/{object,container,account}-server /var/run/swift
   sudo chown -R $USER: ${SWIFT_CONFIG_DIR} /var/run/swift

    if [[ "$SWIFT_CONFIG_DIR" != "/etc/swift" ]]; then
        # Some swift tools are hard-coded to use ``/etc/swift`` and are apparently not going to be fixed.
        # Create a symlink if the config dir is moved
        sudo ln -sf ${SWIFT_CONFIG_DIR} /etc/swift
    fi

    # Swift use rsync to synchronize between all the different
    # partitions (which make more sense when you have a multi-node
    # setup) we configure it with our version of rsync.
    sed -e "
        s/%GROUP%/${USER_GROUP}/;
        s/%USER%/$USER/;
        s,%SWIFT_DATA_DIR%,$SWIFT_DATA_DIR,;
    " $FILES/swift/rsyncd.conf | sudo tee /etc/rsyncd.conf
    # rsyncd.conf just prepared for 4 nodes
    if is_ubuntu; then
        sudo sed -i '/^RSYNC_ENABLE=false/ { s/false/true/ }' /etc/default/rsync
    else
        sudo sed -i '/disable *= *yes/ { s/yes/no/ }' /etc/xinetd.d/rsync
    fi

    if is_service_enabled swift3;then
        swift_auth_server="s3token "
    fi

    # By default Swift will be installed with the tempauth middleware
    # which has some default username and password if you have
    # configured keystone it will checkout the directory.
    if is_service_enabled key; then
        swift_auth_server+="authtoken keystoneauth"
    else
        swift_auth_server=tempauth
    fi

    SWIFT_CONFIG_PROXY_SERVER=${SWIFT_CONFIG_DIR}/proxy-server.conf
    cp ${SWIFT_DIR}/etc/proxy-server.conf-sample ${SWIFT_CONFIG_PROXY_SERVER}

    iniuncomment ${SWIFT_CONFIG_PROXY_SERVER} DEFAULT user
    iniset ${SWIFT_CONFIG_PROXY_SERVER} DEFAULT user ${USER}

    iniuncomment ${SWIFT_CONFIG_PROXY_SERVER} DEFAULT swift_dir
    iniset ${SWIFT_CONFIG_PROXY_SERVER} DEFAULT swift_dir ${SWIFT_CONFIG_DIR}

    iniuncomment ${SWIFT_CONFIG_PROXY_SERVER} DEFAULT workers
    iniset ${SWIFT_CONFIG_PROXY_SERVER} DEFAULT workers 1

    iniuncomment ${SWIFT_CONFIG_PROXY_SERVER} DEFAULT log_level
    iniset ${SWIFT_CONFIG_PROXY_SERVER} DEFAULT log_level DEBUG

    iniuncomment ${SWIFT_CONFIG_PROXY_SERVER} DEFAULT bind_port
    iniset ${SWIFT_CONFIG_PROXY_SERVER} DEFAULT bind_port ${SWIFT_DEFAULT_BIND_PORT:-8080}

    # Only enable Swift3 if we have it enabled in ENABLED_SERVICES
    is_service_enabled swift3 && swift3=swift3 || swift3=""

    iniset ${SWIFT_CONFIG_PROXY_SERVER} pipeline:main pipeline "catch_errors healthcheck cache ratelimit ${swift3} ${swift_auth_server} proxy-logging proxy-server"

    iniset ${SWIFT_CONFIG_PROXY_SERVER} app:proxy-server account_autocreate true

    # Configure Keystone
    sed -i '/^# \[filter:authtoken\]/,/^# \[filter:keystoneauth\]$/ s/^#[ \t]*//' ${SWIFT_CONFIG_PROXY_SERVER}
    iniset ${SWIFT_CONFIG_PROXY_SERVER} filter:authtoken auth_host $KEYSTONE_AUTH_HOST
    iniset ${SWIFT_CONFIG_PROXY_SERVER} filter:authtoken auth_port $KEYSTONE_AUTH_PORT
    iniset ${SWIFT_CONFIG_PROXY_SERVER} filter:authtoken auth_protocol $KEYSTONE_AUTH_PROTOCOL
    iniset ${SWIFT_CONFIG_PROXY_SERVER} filter:authtoken auth_uri $KEYSTONE_SERVICE_PROTOCOL://$KEYSTONE_SERVICE_HOST:$KEYSTONE_SERVICE_PORT/
    iniset ${SWIFT_CONFIG_PROXY_SERVER} filter:authtoken admin_tenant_name $SERVICE_TENANT_NAME
    iniset ${SWIFT_CONFIG_PROXY_SERVER} filter:authtoken admin_user swift
    iniset ${SWIFT_CONFIG_PROXY_SERVER} filter:authtoken admin_password $SERVICE_PASSWORD
    iniset ${SWIFT_CONFIG_PROXY_SERVER} filter:authtoken signing_dir $SWIFT_AUTH_CACHE_DIR

    iniuncomment ${SWIFT_CONFIG_PROXY_SERVER} filter:keystoneauth use
    iniuncomment ${SWIFT_CONFIG_PROXY_SERVER} filter:keystoneauth operator_roles
    iniset ${SWIFT_CONFIG_PROXY_SERVER} filter:keystoneauth operator_roles "Member, admin"

    if is_service_enabled swift3; then
        cat <<EOF >>${SWIFT_CONFIG_PROXY_SERVER}
# NOTE(chmou): s3token middleware is not updated yet to use only
# username and password.
[filter:s3token]
paste.filter_factory = keystone.middleware.s3_token:filter_factory
auth_port = ${KEYSTONE_AUTH_PORT}
auth_host = ${KEYSTONE_AUTH_HOST}
auth_protocol = ${KEYSTONE_AUTH_PROTOCOL}
auth_token = ${SERVICE_TOKEN}
admin_token = ${SERVICE_TOKEN}

[filter:swift3]
use = egg:swift3#swift3
EOF
    fi

    cp ${SWIFT_DIR}/etc/swift.conf-sample ${SWIFT_CONFIG_DIR}/swift.conf
    iniset ${SWIFT_CONFIG_DIR}/swift.conf swift-hash swift_hash_path_suffix ${SWIFT_HASH}

    # This function generates an object/account/proxy configuration
    # emulating 4 nodes on different ports
    function generate_swift_config() {
        local swift_node_config=$1
        local node_id=$2
        local bind_port=$3

        log_facility=$[ node_id - 1 ]
        node_path=${SWIFT_DATA_DIR}/${node_number}

        iniuncomment ${swift_node_config} DEFAULT user
        iniset ${swift_node_config} DEFAULT user ${USER}

        iniuncomment ${swift_node_config} DEFAULT bind_port
        iniset ${swift_node_config} DEFAULT bind_port ${bind_port}

        iniuncomment ${swift_node_config} DEFAULT swift_dir
        iniset ${swift_node_config} DEFAULT swift_dir ${SWIFT_CONFIG_DIR}

        iniuncomment ${swift_node_config} DEFAULT devices
        iniset ${swift_node_config} DEFAULT devices ${node_path}

        iniuncomment ${swift_node_config} DEFAULT log_facility
        iniset ${swift_node_config} DEFAULT log_facility LOG_LOCAL${log_facility}

        iniuncomment ${swift_node_config} DEFAULT mount_check
        iniset ${swift_node_config} DEFAULT mount_check false

        iniuncomment ${swift_node_config} ${server_type}-replicator vm_test_mode
        iniset ${swift_node_config} ${server_type}-replicator vm_test_mode yes
    }

    for node_number in ${SWIFT_REPLICAS_SEQ}; do
        swift_node_config=${SWIFT_CONFIG_DIR}/object-server/${node_number}.conf
        cp ${SWIFT_DIR}/etc/object-server.conf-sample ${swift_node_config}
        generate_swift_config ${swift_node_config} ${node_number} $[OBJECT_PORT_BASE + 10 * (node_number - 1)]

        swift_node_config=${SWIFT_CONFIG_DIR}/container-server/${node_number}.conf
        cp ${SWIFT_DIR}/etc/container-server.conf-sample ${swift_node_config}
        generate_swift_config ${swift_node_config} ${node_number} $[CONTAINER_PORT_BASE + 10 * (node_number - 1)]
        iniuncomment ${swift_node_config} app:container-server allow_versions
        iniset ${swift_node_config} app:container-server allow_versions  "true"

        swift_node_config=${SWIFT_CONFIG_DIR}/account-server/${node_number}.conf
        cp ${SWIFT_DIR}/etc/account-server.conf-sample ${swift_node_config}
        generate_swift_config ${swift_node_config} ${node_number} $[ACCOUNT_PORT_BASE + 10 * (node_number - 1)]
    done

    swift_log_dir=${SWIFT_DATA_DIR}/logs
    rm -rf ${swift_log_dir}
    mkdir -p ${swift_log_dir}/hourly
    sudo chown -R $USER:adm ${swift_log_dir}
    sed "s,%SWIFT_LOGDIR%,${swift_log_dir}," $FILES/swift/rsyslog.conf | sudo \
        tee /etc/rsyslog.d/10-swift.conf
}

# configure_swiftclient() - Set config files, create data dirs, etc
function configure_swiftclient() {
    setup_develop $SWIFTCLIENT_DIR
}

# init_swift() - Initialize rings
function init_swift() {
    local node_number
    # Make sure to kill all swift processes first
    swift-init all stop || true

    # This is where we create three different rings for swift with
    # different object servers binding on different ports.
    pushd ${SWIFT_CONFIG_DIR} >/dev/null && {

        rm -f *.builder *.ring.gz backups/*.builder backups/*.ring.gz

        swift-ring-builder object.builder create ${SWIFT_PARTITION_POWER_SIZE} ${SWIFT_REPLICAS} 1
        swift-ring-builder container.builder create ${SWIFT_PARTITION_POWER_SIZE} ${SWIFT_REPLICAS} 1
        swift-ring-builder account.builder create ${SWIFT_PARTITION_POWER_SIZE} ${SWIFT_REPLICAS} 1

        for node_number in ${SWIFT_REPLICAS_SEQ}; do
            swift-ring-builder object.builder add z${node_number}-127.0.0.1:$[OBJECT_PORT_BASE + 10 * (node_number - 1)]/sdb1 1
            swift-ring-builder container.builder add z${node_number}-127.0.0.1:$[CONTAINER_PORT_BASE + 10 * (node_number - 1)]/sdb1 1
            swift-ring-builder account.builder add z${node_number}-127.0.0.1:$[ACCOUNT_PORT_BASE + 10 * (node_number - 1)]/sdb1 1
        done
        swift-ring-builder object.builder rebalance
        swift-ring-builder container.builder rebalance
        swift-ring-builder account.builder rebalance
    } && popd >/dev/null

    # Create cache dir
    sudo mkdir -p $SWIFT_AUTH_CACHE_DIR
    sudo chown `whoami` $SWIFT_AUTH_CACHE_DIR
    rm -f $SWIFT_AUTH_CACHE_DIR/*
}

function install_swift() {
    git_clone $SWIFT_REPO $SWIFT_DIR $SWIFT_BRANCH
}

function install_swiftclient() {
    git_clone $SWIFTCLIENT_REPO $SWIFTCLIENT_DIR $SWIFTCLIENT_BRANCH
}


# start_swift() - Start running processes, including screen
function start_swift() {
    # (re)start rsyslog
    restart_service rsyslog
    # Start rsync
    if is_ubuntu; then
        sudo /etc/init.d/rsync restart || :
    else
        sudo systemctl start xinetd.service
    fi

   # First spawn all the swift services then kill the
   # proxy service so we can run it in foreground in screen.
   # ``swift-init ... {stop|restart}`` exits with '1' if no servers are running,
   # ignore it just in case
   swift-init all restart || true
   swift-init proxy stop || true
   screen_it swift "cd $SWIFT_DIR && $SWIFT_DIR/bin/swift-proxy-server ${SWIFT_CONFIG_DIR}/proxy-server.conf -v"
}

# stop_swift() - Stop running processes (non-screen)
function stop_swift() {
    # screen normally killed by unstack.sh
    swift-init all stop || true
}

# Restore xtrace
$XTRACE