#!/bin/bash
#
# common functions for ovs based plugin
# -------------------------------------

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

OVS_BRIDGE=${OVS_BRIDGE:-br-int}
PUBLIC_BRIDGE=${PUBLIC_BRIDGE:-br-ex}
OVS_DATAPATH_TYPE=${OVS_DATAPATH_TYPE:-""}

function is_neutron_ovs_base_plugin {
    # Yes, we use OVS.
    return 0
}

function _neutron_ovs_base_setup_bridge {
    local bridge=$1
    neutron-ovs-cleanup
    sudo ovs-vsctl --no-wait -- --may-exist add-br $bridge
    if [[ $OVS_DATAPATH_TYPE != "" ]]; then
        sudo ovs-vsctl set Bridge $bridge datapath_type=${OVS_DATAPATH_TYPE}
    fi
    sudo ovs-vsctl --no-wait br-set-external-id $bridge bridge-id $bridge
}

function neutron_ovs_base_cleanup {
    # remove all OVS ports that look like Neutron created ports
    for port in $(sudo ovs-vsctl list port | grep -o -e [a-zA-Z\-]*tap[0-9a-f\-]* -e q[rg]-[0-9a-f\-]*); do
        sudo ovs-vsctl del-port ${port}
    done

    # remove all OVS bridges created by Neutron
    for bridge in $(sudo ovs-vsctl list-br | grep -o -e ${OVS_BRIDGE} -e ${PUBLIC_BRIDGE}); do
        sudo ovs-vsctl del-br ${bridge}
    done
}

function _neutron_ovs_base_install_ubuntu_dkms {
    # install Dynamic Kernel Module Support packages if needed
    local kernel_version=$(uname -r)
    local kernel_major_minor=`echo $kernel_version | cut -d. -f1-2`
    # From kernel 3.13 on, openvswitch-datapath-dkms is not needed
    if [ `vercmp_numbers "$kernel_major_minor" "3.13"` -lt "0" ]; then
        install_package "dkms openvswitch-datapath-dkms linux-headers-$kernel_version"
    fi
}

function _neutron_ovs_base_install_agent_packages {
    # Install deps
    install_package $(get_packages "openvswitch")
    if is_ubuntu; then
        _neutron_ovs_base_install_ubuntu_dkms
        restart_service openvswitch-switch
    elif is_fedora; then
        restart_service openvswitch
    elif is_suse; then
        restart_service openvswitch-switch
    fi
}

function _neutron_ovs_base_configure_debug_command {
    if [ "$Q_USE_PROVIDERNET_FOR_PUBLIC" = "True" ]; then
        iniset $NEUTRON_TEST_CONFIG_FILE DEFAULT external_network_bridge ""
    else
        iniset $NEUTRON_TEST_CONFIG_FILE DEFAULT external_network_bridge $PUBLIC_BRIDGE
    fi
}

function _neutron_ovs_base_configure_firewall_driver {
    if [[ "$Q_USE_SECGROUP" == "True" ]]; then
        iniset /$Q_PLUGIN_CONF_FILE securitygroup firewall_driver neutron.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver
    else
        iniset /$Q_PLUGIN_CONF_FILE securitygroup firewall_driver neutron.agent.firewall.NoopFirewallDriver
    fi
}

function _neutron_ovs_base_configure_l3_agent {
    if [ "$Q_USE_PROVIDERNET_FOR_PUBLIC" = "True" ]; then
        iniset $Q_L3_CONF_FILE DEFAULT external_network_bridge ""
    else
        iniset $Q_L3_CONF_FILE DEFAULT external_network_bridge $PUBLIC_BRIDGE
    fi

    neutron-ovs-cleanup
    if [[ "$Q_USE_PUBLIC_VETH" = "True" ]]; then
        ip link show $Q_PUBLIC_VETH_INT > /dev/null 2>&1 ||
        sudo ip link add $Q_PUBLIC_VETH_INT type veth \
            peer name $Q_PUBLIC_VETH_EX
        sudo ip link set $Q_PUBLIC_VETH_INT up
        sudo ip link set $Q_PUBLIC_VETH_EX up
        sudo ip addr flush dev $Q_PUBLIC_VETH_EX
    else
        # --no-wait causes a race condition if $PUBLIC_BRIDGE is not up when ip addr flush is called
        sudo ovs-vsctl -- --may-exist add-br $PUBLIC_BRIDGE
        sudo ovs-vsctl br-set-external-id $PUBLIC_BRIDGE bridge-id $PUBLIC_BRIDGE
        # ensure no IP is configured on the public bridge
        sudo ip addr flush dev $PUBLIC_BRIDGE
    fi
}

function _neutron_ovs_base_configure_nova_vif_driver {
    :
}

# Restore xtrace
$OVSB_XTRACE