#!/bin/bash
#
# lib/etcd3
#
# Functions to control the installation and configuration of etcd 3.x
# that provides a key-value store (and possibly other functions).

# Dependencies:
#
# - ``functions`` file

# ``stack.sh`` calls the entry points in this order:
#
# - start_etcd3
# - stop_etcd3
# - cleanup_etcd3

# Save trace setting
_XTRACE_ETCD3=$(set +o | grep xtrace)
set +o xtrace


# Defaults
# --------

# Set up default values for etcd
ETCD_DOWNLOAD_URL=${ETCD_DOWNLOAD_URL:-https://github.com/coreos/etcd/releases/download}
ETCD_VERSION=${ETCD_VERSION:-v3.1.7}
ETCD_DATA_DIR="$DEST/data/etcd"
ETCD_SYSTEMD_SERVICE="devstack@etcd.service"
ETCD_BIN_DIR="$DEST/bin"
ETCD_SHA256_AMD64="4fde194bbcd259401e2b5c462dfa579ee7f6af539f13f130b8f5b4f52e3b3c52"
# NOTE(sdague): etcd v3.1.7 doesn't have anything for these architectures, though 3.2.0 does.
ETCD_SHA256_ARM64=""
ETCD_SHA256_PPC64=""
ETCD_PORT=2379

if is_ubuntu ; then
    UBUNTU_RELEASE_BASE_NUM=`lsb_release -r | awk '{print $2}' | cut -d '.' -f 1`
fi

# start_etcd3() - Starts to run the etcd process
function start_etcd3 {
    # Don't install in sub nodes (multinode scenario)
    if [ "$SERVICE_HOST" != "$HOST_IP" ]; then
        return
    fi

    _install_etcd

    local cmd="$ETCD_BIN_DIR/etcd"
    cmd+=" --name $HOSTNAME --data-dir $ETCD_DATA_DIR"
    cmd+=" --initial-cluster-state new --initial-cluster-token etcd-cluster-01"
    cmd+=" --initial-cluster $HOSTNAME=http://$SERVICE_HOST:2380"
    cmd+=" --initial-advertise-peer-urls http://$SERVICE_HOST:2380"
    cmd+=" --advertise-client-urls http://$SERVICE_HOST:$ETCD_PORT"
    cmd+=" --listen-peer-urls http://0.0.0.0:2380 "
    cmd+=" --listen-client-urls http://$SERVICE_HOST:$ETCD_PORT"

    local unitfile="$SYSTEMD_DIR/$ETCD_SYSTEMD_SERVICE"
    write_user_unit_file $ETCD_SYSTEMD_SERVICE "$cmd" "" "root"

    iniset -sudo $unitfile "Unit" "After" "network.target"
    iniset -sudo $unitfile "Service" "Type" "notify"
    iniset -sudo $unitfile "Service" "Restart" "on-failure"
    iniset -sudo $unitfile "Service" "LimitNOFILE" "65536"

    $SYSTEMCTL daemon-reload
    $SYSTEMCTL enable $ETCD_SYSTEMD_SERVICE
    $SYSTEMCTL start $ETCD_SYSTEMD_SERVICE
}

# stop_etcd3() stops the etcd3 process
function stop_etcd3 {
    # Don't install in sub nodes (multinode scenario)
    if [ "$SERVICE_HOST" != "$HOST_IP" ]; then
        return
    fi

    $SYSTEMCTL stop $ETCD_SYSTEMD_SERVICE
}

function cleanup_etcd3 {
    # Don't install in sub nodes (multinode scenario)
    if [ "$SERVICE_HOST" != "$HOST_IP" ]; then
        return
    fi

    $SYSTEMCTL disable $ETCD_SYSTEMD_SERVICE

    local unitfile="$SYSTEMD_DIR/$ETCD_SYSTEMD_SERVICE"
    sudo rm -f $unitfile

    $SYSTEMCTL daemon-reload

    sudo rm -rf $ETCD_DATA_DIR
}

function _install_etcd {
    echo "Installing etcd"

    # Make sure etcd3 downloads the correct architecture
    if is_arch "x86_64"; then
        ETCD_ARCH="amd64"
        ETCD_SHA256=${ETCD_SHA256:-$ETCD_SHA256_AMD64}
    elif is_arch "aarch64"; then
        ETCD_ARCH="arm64"
        ETCD_SHA256=${ETCD_SHA256:-$ETCD_SHA256_ARM64}
    elif is_arch "ppc64le"; then
        ETCD_ARCH="ppc64le"
        ETCD_SHA256=${ETCD_SHA256:-$ETCD_SHA256_PPC64}
    else
        exit_distro_not_supported "invalid hardware type - $ETCD_ARCH"
    fi

    ETCD_NAME=etcd-$ETCD_VERSION-linux-$ETCD_ARCH

    # Install the libraries needed. Note: tooz for example does not have a hard dependency on these libraries
    pip_install etcd3
    pip_install etcd3gw

    # Create the necessary directories
    sudo mkdir -p $ETCD_BIN_DIR
    sudo mkdir -p $ETCD_DATA_DIR

    # Download and cache the etcd tgz for subsequent use
    if [ ! -f "$FILES/etcd-$ETCD_VERSION-linux-$ETCD_ARCH/etcd" ]; then
        ETCD_DOWNLOAD_FILE=$ETCD_NAME.tar.gz
        wget $ETCD_DOWNLOAD_URL/$ETCD_VERSION/$ETCD_DOWNLOAD_FILE -O $FILES/$ETCD_DOWNLOAD_FILE
        echo "${ETCD_SHA256} $FILES/${ETCD_DOWNLOAD_FILE}" > $FILES/etcd.sha256sum
        # NOTE(sdague): this should go fatal if this fails
        sha256sum -c $FILES/etcd.sha256sum

        tar xzvf $FILES/$ETCD_DOWNLOAD_FILE -C $FILES
        sudo cp $FILES/$ETCD_NAME/etcd $ETCD_BIN_DIR/etcd
    fi
    if [ ! -f "$ETCD_BIN_DIR/etcd" ]; then
        sudo cp $FILES/$ETCD_NAME/etcd $ETCD_BIN_DIR/etcd
    fi
}

# Restore xtrace
$_XTRACE_ETCD3

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