#!/bin/bash
#
# lib/kuryr
# Utilities for kuryr-kubernetes devstack
# bind_for_kubelet
#   Description: Creates an OVS internal port so that baremetal kubelet will be
#                able to make both liveness and readiness http/tcp probes.
#   Params:
#      project - Id or name of the project used for kuryr devstack
#      port    - Port to open for K8s API, relevant only for OpenStack infra

# Dependencies:
# (none)

function ovs_bind_for_kubelet() {
    local port_id
    local port_mac
    local fixed_ips
    local port_ips
    local port_subnets
    local prefix
    local project_id
    local port_number
    local security_group
    local ifname
    local service_subnet_cidr
    local pod_subnet_gw
    local cidrs

    project_id="$1"
    port_number="$2"
    security_group=$(openstack security group list \
        --project "$project_id" -c ID -c Name -f value | \
        awk '{if ($2=="default") print $1}')
    port_id=$(openstack port create \
        --device-owner compute:kuryr \
        --project "$project_id" \
        --security-group "$security_group" \
        --host "${HOSTNAME}" \
        --network "${KURYR_NEUTRON_DEFAULT_POD_NET}" \
        -f value -c id \
        kubelet-"${HOSTNAME}")
    # Need to enable Amphorae subnet access to the kubelet iface for API
    # access
    openstack port set "$port_id" --security-group service_pod_access

    ifname="kubelet${port_id}"
    ifname="${ifname:0:14}"
    service_subnet_cidr=$(openstack --os-cloud devstack-admin \
                         --os-region "$REGION_NAME" \
                         subnet show "$KURYR_NEUTRON_DEFAULT_SERVICE_SUBNET" \
                         -c cidr -f value)
    pod_subnet_gw=$(openstack subnet show "$KURYR_NEUTRON_DEFAULT_POD_SUBNET" \
                    -c gateway_ip -f value)

    port_mac=$(openstack port show "$port_id" -c mac_address -f value)
    fixed_ips=$(openstack port show "$port_id" -f value -c fixed_ips)
    port_ips=($(python3 -c "print(${fixed_ips}[0]['ip_address'])"))
    port_subnets=($(python3 -c "print(${fixed_ips}[0]['subnet_id'])"))

    sudo ovs-vsctl -- --may-exist add-port $OVS_BRIDGE "$ifname" \
        -- set Interface "$ifname" type=internal \
        -- set Interface "$ifname" external-ids:iface-status=active \
        -- set Interface "$ifname" external-ids:attached-mac="$port_mac" \
        -- set Interface "$ifname" external-ids:iface-id="$port_id"

    sudo ip link set dev "$ifname" address "$port_mac"
    sudo ip link set dev "$ifname" up
    for ((i=0; i < ${#port_ips[@]}; i++)); do
        prefix=$(openstack subnet show "${port_subnets[$i]}" \
            -c cidr -f value | \
            cut -f2 -d/)
        sudo ip addr add "${port_ips[$i]}/${prefix}" dev "$ifname"
    done
    if [[ "$KURYR_SUBNET_DRIVER" == "namespace" ]]; then
        if [ "$KURYR_IPV6" == "False" ]; then
            subnetpool_id=${KURYR_NEUTRON_DEFAULT_SUBNETPOOL_ID:-${SUBNETPOOL_V4_ID}}
        else
            subnetpool_id=${KURYR_NEUTRON_DEFAULT_SUBNETPOOL_ID:-${SUBNETPOOL_KURYR_V6_ID}}
        fi
        cidrs=$(openstack subnet pool show "${subnetpool_id}" -c prefixes -f value)
        subnetpool_cidr=$(python3 -c "print(${cidrs}[0])")
        sudo ip route add "$subnetpool_cidr" via "$pod_subnet_gw" dev "$ifname"
    else
        sudo ip route add "$service_subnet_cidr" via "$pod_subnet_gw" dev "$ifname"
    fi

    if [ -n "$port_number" ]; then
        # if openstack-INPUT chain doesn't exist we create it in INPUT (for
        # local development envs since openstack-INPUT is usually only in gates)
        if [ "$KURYR_IPV6" == "False" ]; then
          sudo iptables -I openstack-INPUT 1 \
              -p tcp -s 0.0.0.0/0 -d 0.0.0.0/0 --dport $port_number -j ACCEPT || \
          sudo iptables -I INPUT 1 \
              -p tcp -m conntrack --ctstate NEW \
              -m tcp --dport "$port_number" \
              -m comment --comment "kuryr-devstack: Access to OpenShift API" -j ACCEPT
        else
          sudo ip6tables -I openstack-INPUT 1 \
              -p tcp -s ::/0 -d ::/0 --dport $port_number -j ACCEPT || \
          sudo ip6tables -I INPUT 1 \
              -p tcp -m conntrack --ctstate NEW \
              -m tcp --dport "$port_number" \
              -m comment --comment "kuryr-devstack: Access to OpenShift API" -j ACCEPT
        fi
    fi
}

# get_container
#   Description: Pulls a container from Dockerhub
#   Params:
#      image_name - the name of the image in docker hub
#      version    - The version of the image to pull. Defaults to 'latest'
function get_container {
    local image
    local image_name
    local version
    image_name="$1"
    version="${2:-latest}"

    if [ "$image_name" == "" ]; then
        return 0
    fi

    image="${image_name}:${version}"
    if [ -z "$(container_runtime images -q "$image")" ]; then
        container_runtime pull "$image"
    fi
}

# run_container
#   Description: Runs a container and attaches devstack's logging to it
#   Params:
#      name - Name of the container to run
#      args - arguments to run the container with
function run_container {
    # Runs a detached container and uses devstack's run process to monitor
    # its logs
    local name

    name="$1"
    shift
    args="$@"
    container_runtime create --name $name $args

    if [[ ${CONTAINER_ENGINE} == 'crio' ]]; then
        run_process "$name"  "$(which podman) start --attach $name" root root
    else
        run_process "$name"  "$(which docker) start --attach $name"
    fi
}

# stop_container
#   Description: stops a container and its devstack logging
#   Params:
#      name - Name of the container to stop
function stop_container {
    local name
    name="$1"

    container_runtime kill "$name"
    container_runtime rm "$name"
    stop_process "$name"
}

# _allocation_range
#   Description: Writes out tab separated usable ip range for a CIDR
#   Params:
#       cidr - The cidr to get the range for
#       gateway_position - Whether to reserve at 'beginning' or at 'end'
function _allocation_range {
  python3 - <<EOF "$@"
import sys

from netaddr import IPNetwork
import six


n = IPNetwork(six.text_type(sys.argv[1]))
gateway_position = sys.argv[2]

if gateway_position == 'beginning':
    beg_offset = 2
    end_offset = 2
elif gateway_position == 'end':
    beg_offset = 1
    end_offset = 3
else:
    raise ValueError('Disallowed gateway position %s' % gateway_position)

print("%s\\t%s" % (n[beg_offset], n[-end_offset]))
EOF
}

# create_k8s_icmp_sg_rules
#   Description: Creates icmp sg rules for Kuryr-Kubernetes pods
#   Params:
#      sg_id       - Kuryr's security group id
#      direction   - egress or ingress direction
function create_k8s_icmp_sg_rules {
    local sg_id=$1
    local direction="$2"
    local project_id

    project_id=$(get_or_create_project \
        "$KURYR_NEUTRON_DEFAULT_PROJECT" default)
    icmp_sg_rules=$(openstack --os-cloud devstack-admin \
                              --os-region "$REGION_NAME" \
                              security group rule create \
                              --project "$project_id" \
                              --protocol icmp \
                              --ethertype "$KURYR_ETHERTYPE" \
                              --"$direction" "$sg_id")
    die_if_not_set $LINENO icmp_sg_rules \
        "Failure creating icmp sg ${direction} rule for ${sg_id}"
}

# create_k8s_subnet
#   Description: Creates a network and subnet for Kuryr-Kubernetes usage
#   Params:
#      project_id       - Kuryr's project uuid
#      net_name         - Name of the network to create
#      subnet_name      - Name of the subnet to create
#      subnetpool_id    - uuid of the subnet pool to use
#      router           - name of the router to plug the subnet to
#      split_allocation - Whether to allocate on all the subnet or only the
#                         latter half
function create_k8s_subnet {
    local project_id=$1
    local net_name="$2"
    local subnet_name="$3"
    local subnetpool_id="$4"
    local router="$5"
    local subnet_params="--project $project_id "
    local subnet_cidr
    local split_allocation

    split_allocation="${6:-False}"

    if [ "$KURYR_IPV6" == "False" ]; then
      subnet_params+="--ip-version 4 "
    else
      # NOTE(dulek): K8s API won't accept subnets bigger than 20 bits.
      #              And 20 will totally be fine for us.
      subnet_params+="--ip-version 6 --prefix-length 108 "
    fi
    subnet_params+="--no-dhcp --gateway none "
    subnet_params+="--subnet-pool $subnetpool_id "

    local net_id
    net_id=$(openstack --os-cloud devstack-admin \
                       --os-region "$REGION_NAME" \
                       network create --project "$project_id" \
                       "$net_name" \
                       -c id -f value)
    subnet_params+="--network $net_id $subnet_name"

    local subnet_id
    subnet_id=$(openstack --os-cloud devstack-admin \
                          --os-region "$REGION_NAME" \
                          subnet create $subnet_params \
                          --project "$project_id" \
                          -c id -f value)
    die_if_not_set $LINENO subnet_id \
        "Failure creating K8s ${subnet_name} IPv4 subnet for ${project_id}"

    subnet_cidr=$(openstack --os-cloud devstack-admin \
                             --os-region "$REGION_NAME" \
                             subnet show "$subnet_id" \
                             -c cidr -f value)
    die_if_not_set $LINENO subnet_cidr \
        "Failure getting K8s ${subnet_name} IPv4 subnet for $project_id"

    # Since K8s has its own IPAM for services and allocates the first IP from
    # service subnet CIDR to Kubernetes apiserver, we'll always put the router
    # interface at the end of the range.
    local router_ip
    local allocation_start
    local allocation_end
    local allocation_subnet
    router_ip=$(_cidr_range "$subnet_cidr" | cut -f2)
    if [[ "$split_allocation" == "True" ]]; then
        allocation_subnet=$(split_subnet "$subnet_cidr" | cut -f2)
        allocation_start=$(_allocation_range "$allocation_subnet" end | cut -f1)
        allocation_end=$(_allocation_range "$allocation_subnet" end | cut -f2)
    else
        allocation_start=$(_allocation_range "$subnet_cidr" end | cut -f1)
        allocation_end=$(_allocation_range "$subnet_cidr" end | cut -f2)
    fi
    die_if_not_set $LINENO router_ip \
        "Failed to determine K8s ${subnet_name} subnet router IP"
    openstack --os-cloud devstack-admin \
        --os-region "$REGION_NAME" subnet set \
        --gateway "$router_ip" --no-allocation-pool "$subnet_id" \
        || die $LINENO "Failed to update K8s ${subnet_name} subnet"
    # Set a new allocation pool for the subnet so ports can be created again
    openstack --os-cloud devstack-admin \
        --os-region "$REGION_NAME" subnet set \
        --allocation-pool "start=${allocation_start},end=${allocation_end}" \
        "$subnet_id" || die $LINENO "Failed to update K8s ${subnet_name} subnet"
    openstack --os-cloud devstack-admin \
              --os-region "$REGION_NAME" \
              router add subnet "$router" "$subnet_id" \
              || die $LINENO \
              "Failed to enable routing for K8s ${subnet_name} subnet"
}

# create_k8s_fake_service
#   Description: Creates an endpoint-less kubernetes service to keep Kubernetes
#                API server from allocating this IP for another service
function create_k8s_fake_service {
    local fake_svc_name
    local fake_svc_ip

    fake_svc_name="$1"
    fake_svc_ip="$2"

    existing_svc_ip=$(/usr/local/bin/kubectl get svc --namespace kube-system -o jsonpath='{.items[?(@.metadata.name=='"\"${fake_svc_name}\""')].spec.clusterIP}')

    if [[ "$existing_svc_ip" == "" ]]; then
        # Create fake service so the clusterIP can't be reassigned
        cat <<EOF | /usr/local/bin/kubectl create -f -
kind: Service
apiVersion: v1
metadata:
  name: "${fake_svc_name}"
  namespace: kube-system
spec:
  type: ClusterIP
  clusterIP: "${fake_svc_ip}"
  ports:
    - protocol: TCP
      port: 80
EOF
    fi
}

# build_kuryr_containers
#   Description: Generates a Kuryr controller and Kuryr CNI docker images in
#       the local docker registry as kuryr/controller:latest and
#       kuryr/cni:latest respectively
function build_kuryr_containers() {
    local build_args
    local build_dir

    build_dir="${DEST}/kuryr-kubernetes"
    pushd "$build_dir"

    KURYR_CONTAINERS_USE_LOWER_CONSTRAINTS=$(trueorfalse False KURYR_CONTAINERS_USE_LOWER_CONSTRAINTS)
    if [[ "$KURYR_CONTAINERS_USE_LOWER_CONSTRAINTS" == "True" ]]; then
        build_args="--build-arg UPPER_CONSTRAINTS_FILE=/opt/kuryr-kubernetes/lower-constraints.txt"
    fi

    # Build images
    # FIXME(dulek): Until https://github.com/containers/buildah/issues/1206 is
    #               resolved instead of podman we need to use buildah directly,
    #               hence this awful if clause.
    if [[ ${CONTAINER_ENGINE} == 'crio' ]]; then
        sudo buildah bud -t docker.io/kuryr/controller -f controller.Dockerfile .
        sudo buildah bud -t docker.io/kuryr/cni -f cni.Dockerfile .
    else
        container_runtime build -t kuryr/controller -f controller.Dockerfile ${build_args}  .
        container_runtime build -t kuryr/cni -f cni.Dockerfile ${build_args} .
    fi
    popd
}

function indent() {
    sed 's/^/    /';
}

function generate_kuryr_configmap() {
    local output_dir
    local conf_path
    output_dir=$1
    conf_path=${2:-""}

    mkdir -p "$output_dir"
    rm -f ${output_dir}/config_map.yml

    cat >> "${output_dir}/config_map.yml" << EOF
apiVersion: v1
kind: ConfigMap
metadata:
  name: kuryr-config
  namespace: kube-system
data:
  kuryr.conf: |
EOF

    cat $conf_path | indent >> "${output_dir}/config_map.yml"
}

function generate_kuryr_certificates_secret() {
    local output_dir
    local certs_bundle_path
    output_dir=$1
    certs_bundle_path=${2:-""}

    mkdir -p "$output_dir"
    rm -f ${output_dir}/certificates_secret.yml

    CA_CERT=\"\"  # It's a "" string that will be inserted into yaml file.

    if [ $certs_bundle_path -a -f $certs_bundle_path ]; then
        CA_CERT=$(base64 -w0 < "$certs_bundle_path")
    fi

    cat >> "${output_dir}/certificates_secret.yml" << EOF
apiVersion: v1
kind: Secret
metadata:
  name: kuryr-certificates
  namespace: kube-system
type: Opaque
data:
  kuryr-ca-bundle.crt: $CA_CERT
EOF
}

function generate_kuryr_service_account() {
    output_dir=$1
    mkdir -p "$output_dir"
    rm -f ${output_dir}/service_account.yml
    cat >> "${output_dir}/service_account.yml" << EOF
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: kuryr-controller
  namespace: kube-system
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: kuryr-controller
rules:
- apiGroups:
  - ""
  verbs: ["*"]
  resources:
    - endpoints
    - pods
    - nodes
    - services
    - services/status
    - namespaces
- apiGroups:
    - openstack.org
  verbs: ["*"]
  resources:
    - kuryrnets
    - kuryrnetworks
    - kuryrnetpolicies
    - kuryrloadbalancers
- apiGroups: ["networking.k8s.io"]
  resources:
  - networkpolicies
  verbs:
  - get
  - list
  - watch
  - update
  - patch
- apiGroups: ["k8s.cni.cncf.io"]
  resources:
  - network-attachment-definitions
  verbs:
  - get
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: kuryr-controller-global
subjects:
- kind: ServiceAccount
  name: kuryr-controller
  namespace: kube-system
roleRef:
  kind: ClusterRole
  name: kuryr-controller
  apiGroup: rbac.authorization.k8s.io
EOF
}

function generate_controller_deployment() {
    output_dir=$1
    health_server_port=$2
    controller_ha=$3
    mkdir -p "$output_dir"
    rm -f ${output_dir}/controller_deployment.yml
    cat >> "${output_dir}/controller_deployment.yml" << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    name: kuryr-controller
  name: kuryr-controller
  namespace: kube-system
spec:
  replicas: ${KURYR_CONTROLLER_REPLICAS:-1}
  selector:
    matchLabels:
      name: kuryr-controller
EOF

    # When running without HA we should make sure that we won't have more than
    # one kuryr-controller pod in the deployment.
    if [ "$controller_ha" == "False" ]; then
        cat >> "${output_dir}/controller_deployment.yml" << EOF
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 0
      maxUnavailable: 1
EOF
    fi

    cat >> "${output_dir}/controller_deployment.yml" << EOF
  template:
    metadata:
      labels:
        name: kuryr-controller
      name: kuryr-controller
    spec:
      serviceAccountName: kuryr-controller
      automountServiceAccountToken: true
      hostNetwork: true
      containers:
EOF

    if [ "$controller_ha" == "True" ]; then
        cat >> "${output_dir}/controller_deployment.yml" << EOF
      - image: gcr.io/google_containers/leader-elector:0.5
        name: leader-elector
        args:
        - "--election=kuryr-controller"
        - "--http=0.0.0.0:${KURYR_CONTROLLER_HA_PORT:-16401}"
        - "--election-namespace=kube-system"
        - "--ttl=5s"
        ports:
        - containerPort: ${KURYR_CONTROLLER_HA_PORT:-16401}
          protocol: TCP
EOF
    fi

    cat >> "${output_dir}/controller_deployment.yml" << EOF
      - image: kuryr/controller:latest
        imagePullPolicy: Never
        name: controller
        terminationMessagePath: "/dev/termination-log"
        volumeMounts:
        - name: config-volume
          mountPath: "/etc/kuryr"
        - name: certificates-volume
          mountPath: "/etc/ssl/certs"
          readOnly: true
        readinessProbe:
          httpGet:
            path: /ready
            port: ${health_server_port}
            scheme: HTTP
          timeoutSeconds: 5
        livenessProbe:
          httpGet:
            path: /alive
            port: ${health_server_port}
          initialDelaySeconds: 15
EOF

    cat >> "${output_dir}/controller_deployment.yml" << EOF
      volumes:
      - name: config-volume
        configMap:
          name: kuryr-config
      - name: certificates-volume
        secret:
          secretName: kuryr-certificates
      restartPolicy: Always
      tolerations:
      - key: "node-role.kubernetes.io/master"
        operator: "Exists"
        effect: "NoSchedule"
      - key: "node.kubernetes.io/not-ready"
        operator: "Exists"
        effect: "NoSchedule"
EOF
}

function generate_cni_daemon_set() {
    output_dir=$1
    cni_health_server_port=$2
    cni_bin_dir=${3:-/opt/cni/bin}
    cni_conf_dir=${4:-/etc/cni/net.d}
    mkdir -p "$output_dir"
    rm -f ${output_dir}/cni_ds.yml
    cat >> "${output_dir}/cni_ds.yml" << EOF
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: kuryr-cni-ds
  namespace: kube-system
  labels:
    tier: node
    app: kuryr-cni
spec:
  selector:
    matchLabels:
      app: kuryr-cni
  template:
    metadata:
      labels:
        tier: node
        app: kuryr-cni
    spec:
      hostNetwork: true
      tolerations:
      - key: node-role.kubernetes.io/master
        operator: Exists
        effect: NoSchedule
      - key: "node.kubernetes.io/not-ready"
        operator: "Exists"
        effect: "NoSchedule"
      serviceAccountName: kuryr-controller
      containers:
      - name: kuryr-cni
        image: kuryr/cni:latest
        imagePullPolicy: Never
        command: [ "cni_ds_init" ]
        env:
        - name: KUBERNETES_NODE_NAME
          valueFrom:
            fieldRef:
              fieldPath: spec.nodeName
        - name: KURYR_CNI_POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        securityContext:
          privileged: true
        volumeMounts:
        - name: bin
          mountPath: /opt/cni/bin
        - name: net-conf
          mountPath: /etc/cni/net.d
        - name: config-volume
          mountPath: /etc/kuryr
        - name: proc
          mountPath: /host_proc
        - name: var-pci
          mountPath: /var/pci_address
EOF
    if [[ -n "$VAR_RUN_PATH" ]]; then
        cat >> "${output_dir}/cni_ds.yml" << EOF
        - name: openvswitch
          mountPath: /var/run
EOF
    fi
    cat >> "${output_dir}/cni_ds.yml" << EOF
        readinessProbe:
          httpGet:
            path: /ready
            port: ${cni_health_server_port}
            scheme: HTTP
          initialDelaySeconds: 60
          timeoutSeconds: 10
        livenessProbe:
          httpGet:
            path: /alive
            port: ${cni_health_server_port}
          initialDelaySeconds: 60
      volumes:
        - name: bin
          hostPath:
            path: ${cni_bin_dir}
        - name: net-conf
          hostPath:
            path: ${cni_conf_dir}
        - name: config-volume
          configMap:
            name: kuryr-config
        - name: proc
          hostPath:
            path: /proc
        - name: var-pci
          hostPath:
            path: /var/pci_address
EOF
    if [[ -n "$VAR_RUN_PATH" ]]; then
        cat >> "${output_dir}/cni_ds.yml" << EOF
        - name: openvswitch
          hostPath:
            path: ${VAR_RUN_PATH}
EOF
    fi
}

# install_openshift_binary
#   Description: Fetches the configured binary release of OpenShift and
#                installs it in the system
function install_openshift_binary {
    mkdir -p "$OPENSHIFT_BIN"

    curl -L ${OPENSHIFT_BINARY_BASE_URL}/${OPENSHIFT_BINARY_VERSION}/CHECKSUM --silent | \
        awk -v "ver=${OPENSHIFT_BINARY_VERSION}" \
            -v "dest=${OPENSHIFT_BIN}/openshift.tar.gz" \
            -v "baseurl=${OPENSHIFT_BINARY_BASE_URL}" \
            '/server/ {system("curl -L " baseurl "/" ver "/" $2 " --retry 2 -o " dest)}'

    tar xzvf "${OPENSHIFT_BIN}/openshift.tar.gz" --strip 1 -C "$OPENSHIFT_BIN"

    # Make openshift run from its untarred directory
    cat << EOF | sudo tee /usr/local/bin/openshift
#!/bin/bash
cd ${OPENSHIFT_BIN}
exec ./openshift "\$@"
EOF
    sudo chmod a+x /usr/local/bin/openshift

    # For releases >= 3.11 we'll need hyperkube as well
    cat << EOF | sudo tee /usr/local/bin/hyperkube
#!/bin/bash
cd ${OPENSHIFT_BIN}
exec ./hyperkube "\$@"
EOF
    sudo chmod a+x /usr/local/bin/hyperkube

    # Make oc easily available
    cat << EOF | sudo tee /usr/local/bin/oc
#!/bin/bash
CURL_CA_BUNDLE=${OPENSHIFT_DATA_DIR}/master/ca.crt \
    KUBECONFIG=${OPENSHIFT_DATA_DIR}/master/admin.kubeconfig \
    ${OPENSHIFT_BIN}/oc "\$@"
EOF
    sudo chmod a+x /usr/local/bin/oc

    # Make kubectl easily available
    cat << EOF | sudo tee /usr/local/bin/kubectl
#!/bin/bash
CURL_CA_BUNDLE=${OPENSHIFT_DATA_DIR}/master/ca.crt \
    KUBECONFIG=${OPENSHIFT_DATA_DIR}/master/admin.kubeconfig \
    ${OPENSHIFT_BIN}/kubectl "\$@"
EOF
    sudo chmod a+x /usr/local/bin/kubectl
}

# run_openshift_master
#   Description: Starts the openshift master
function run_openshift_master {
    local cmd
    local pod_subnet_cidr
    local service_subnet_cidr
    local portal_net

    sudo install -d -o "$STACK_USER" "$OPENSHIFT_DATA_DIR"

    pod_subnet_cidr=$(openstack --os-cloud devstack-admin \
                         --os-region "$REGION_NAME" \
                         subnet show "$KURYR_NEUTRON_DEFAULT_POD_SUBNET" \
                         -c cidr -f value)
    service_subnet_cidr=$(openstack --os-cloud devstack-admin \
                         --os-region "$REGION_NAME" \
                         subnet show "$KURYR_NEUTRON_DEFAULT_SERVICE_SUBNET" \
                         -c cidr -f value)

    if is_service_enabled octavia; then
        portal_net=$(split_subnet "$service_subnet_cidr" | cut -f1)
    else
        portal_net="$service_subnet_cidr"
    fi

    # Generate master config
    "${OPENSHIFT_BIN}/openshift" start master \
        "--etcd=http://${SERVICE_HOST}:${ETCD_PORT}" \
        "--network-cidr=${pod_subnet_cidr}" \
        "--portal-net=${portal_net}" \
        "--listen=0.0.0.0:${OPENSHIFT_API_PORT}" \
        "--master=${OPENSHIFT_API_URL}" \
        "--write-config=${OPENSHIFT_DATA_DIR}/master"

    # Enable externalIPs
    sed -i 's/externalIPNetworkCIDRs: null/externalIPNetworkCIDRs: ["0.0.0.0\/0"]/' "${OPENSHIFT_DATA_DIR}/master/master-config.yaml"

    # Reconfigure Kuryr-Kubernetes to use the certs generated
    iniset "$KURYR_CONFIG" kubernetes ssl_client_crt_file "${OPENSHIFT_DATA_DIR}/master/admin.crt"
    iniset "$KURYR_CONFIG" kubernetes ssl_client_key_file "${OPENSHIFT_DATA_DIR}/master/admin.key"
    iniset "$KURYR_CONFIG" kubernetes ssl_ca_crt_file "${OPENSHIFT_DATA_DIR}/master/ca.crt"

    sudo chown "${STACK_USER}:${STACK_USER}" -R "$OPENSHIFT_DATA_DIR"

    # Generate kubelet kubeconfig
    "${OPENSHIFT_BIN}/oc" adm create-kubeconfig \
        "--client-key=${OPENSHIFT_DATA_DIR}/master/master.kubelet-client.key" \
        "--client-certificate=${OPENSHIFT_DATA_DIR}/master/master.kubelet-client.crt" \
        "--certificate-authority=${OPENSHIFT_DATA_DIR}/master/ca.crt" \
        "--master=${OPENSHIFT_API_URL}" \
        "--kubeconfig=${OPENSHIFT_DATA_DIR}/master/master.kubelet-client.kubeconfig"

    cmd="/usr/local/bin/openshift start master \
        --config=${OPENSHIFT_DATA_DIR}/master/master-config.yaml"

    wait_for "etcd" "http://${SERVICE_HOST}:${ETCD_PORT}/v2/machines"

    run_process openshift-master "$cmd" root root
}

# make_admin_cluster_admin
#   Description: Gives the system:admin permissions over the cluster
function make_admin_cluster_admin {
    wait_for "OpenShift API Server" "$OPENSHIFT_API_URL" \
        "${OPENSHIFT_DATA_DIR}/master/ca.crt"
    /usr/local/bin/oc adm policy add-cluster-role-to-user cluster-admin admin \
        "--config=${OPENSHIFT_DATA_DIR}/master/openshift-master.kubeconfig"
    /usr/local/bin/oc adm policy add-cluster-role-to-user cluster-admin system:openshift-node-admin \
        "--config=${OPENSHIFT_DATA_DIR}/master/openshift-master.kubeconfig"
}

# run_openshift_node
#   Description: Starts the openshift node
function run_openshift_node {
    local command

    #install required CNI loopback driver
    sudo mkdir -p "$CNI_BIN_DIR"
    curl -L "$OPENSHIFT_CNI_BINARY_URL" | sudo tar -C "$CNI_BIN_DIR" -xzvf - ./loopback

    # Since 3.11 we should run upstream kubelet through hyperkube.
    declare -r min_no_node_ver="v3.11.0"
    if [[ "$min_no_node_ver" == "$(echo -e "${OPENSHIFT_BINARY_VERSION}\n${min_no_node_ver}" | sort -V | head -n 1)" ]]; then
        # generate kubelet configuration and certs
        local name
        name=`hostname`
        oc adm create-node-config --node-dir ${OPENSHIFT_DATA_DIR}/node \
                                  --node ${name} \
                                  --hostnames ${name} \
                                  --certificate-authority ${OPENSHIFT_DATA_DIR}/master/ca.crt \
                                  --signer-cert ${OPENSHIFT_DATA_DIR}/master/ca.crt \
                                  --signer-key=${OPENSHIFT_DATA_DIR}/master/ca.key \
                                  --signer-serial ${OPENSHIFT_DATA_DIR}/master/ca.serial.txt \
                                  --node-client-certificate-authority=${OPENSHIFT_DATA_DIR}/master/ca.crt

        command="/usr/local/bin/hyperkube kubelet \
        --network-plugin=cni \
        --address=0.0.0.0 \
        --port=10250 \
        --cgroup-driver $(docker info|awk '/Cgroup/ {print $NF}') \
        --fail-swap-on=false \
        --allow-privileged=true \
        --v=2 \
        --tls-cert-file=${OPENSHIFT_DATA_DIR}/node/server.crt \
        --tls-private-key-file=${OPENSHIFT_DATA_DIR}/node/server.key"
    else
        command="/usr/local/bin/openshift start node \
        --enable=kubelet,plugins \
        --network-plugin=cni \
        --listen=https://0.0.0.0:8442"
    fi
    command+=" --kubeconfig=${OPENSHIFT_DATA_DIR}/master/master.kubelet-client.kubeconfig"

    # Link master config necessary for bootstrapping
    # TODO: This needs to be generated so we don't depend on it on multinode
    mkdir -p "${OPENSHIFT_BIN}/openshift.local.config"
    ln -fs "${OPENSHIFT_DATA_DIR}/master" "${OPENSHIFT_BIN}/openshift.local.config/master"
    mkdir -p "${OPENSHIFT_DATA_DIR}/node"
    ln -fs "${OPENSHIFT_DATA_DIR}/node" "${OPENSHIFT_BIN}/openshift.local.config/node"

    # Link stack CNI to location expected by openshift node
    sudo mkdir -p /etc/cni
    sudo rm -fr /etc/cni/net.d
    sudo rm -fr /opt/cni/bin
    sudo ln -fs "${CNI_CONF_DIR}" /etc/cni/net.d
    sudo mkdir -p /opt/cni
    sudo ln -fs "${CNI_BIN_DIR}" /opt/cni/bin


    run_process openshift-node "$command" root root
}

# lb_state
#   Description: Returns the state of the load balancer
#   Params:
#      id - Id or name of the loadbalancer the state of which needs to be
#           retrieved.
function lb_state {
    local lb_id

    lb_id="$1"
    openstack loadbalancer show "$lb_id" | \
        awk '/provisioning_status/ {print $4}'
}

function wait_for_lb {
    local lb_name
    local curr_time
    local time_diff
    local start_time

    lb_name="$1"
    timeout=${2:-$KURYR_WAIT_TIMEOUT}

    echo -n "Waiting for LB:$lb_name"
    start_time=$(date +%s)

    while [[ "$(lb_state "$lb_name")" != "ACTIVE" ]]; do
        echo -n "Waiting till LB=$lb_name is ACTIVE."
        curr_time=$(date +%s)
        time_diff=$((curr_time - start_time))
        [[ $time_diff -le $timeout ]] || die "Timed out waiting for $lb_name"
        sleep 5
    done
}

# create_load_balancer
#   Description: Creates an OpenStack Load Balancer with either neutron LBaaS
#                or Octavia
#   Params:
#       lb_name: Name to give to the load balancer.
#       lb_vip_subnet: Id or name of the subnet where lb_vip should be
#                      allocated.
#       project_id: Id of the project where the load balancer should be
#                   allocated.
#       lb_vip: Virtual IP to give to the load balancer - optional.
function create_load_balancer {
    local lb_name
    local lb_vip_subnet
    local lb_params
    local project_id

    lb_name="$1"
    lb_vip_subnet="$2"
    project_id="$3"

    lb_params=" --name $lb_name "
    if [ -z "$4" ]; then
        echo -n "create_load_balancer LB=$lb_name, lb_vip not provided."
    else
        lb_params+=" --vip-address $4"
    fi

    lb_params+=" --project ${project_id} --vip-subnet-id $lb_vip_subnet"
    openstack loadbalancer create $lb_params
}

# create_load_balancer_listener
#   Description: Creates an OpenStack Load Balancer Listener for the specified
#                Load Balancer with either neutron LBaaS or Octavia
#   Params:
#       name: Name to give to the load balancer listener.
#       protocol: Whether it is HTTP, HTTPS, TCP, etc.
#       port: The TCP port number to listen to.
#       data_timeouts: Octavia's timeouts for client and server inactivity.
#       lb: Id or name of the Load Balancer we want to add the Listener to.
#       project_id: Id of the project where this listener belongs to.
function create_load_balancer_listener {
    local name
    local protocol
    local port
    local lb
    local data_timeouts
    local max_timeout
    local project_id

    name="$1"
    protocol="$2"
    port="$3"
    lb="$4"
    project_id="$5"
    data_timeouts="$6"

    max_timeout=1200
    # Octavia needs the LB to be active for the listener
    wait_for_lb $lb $max_timeout

    openstack loadbalancer listener create --name "$name" \
        --protocol "$protocol" \
        --protocol-port "$port" \
        --timeout-client-data "$data_timeouts" \
        --timeout-member-data "$data_timeouts" \
        "$lb"
}

# create_load_balancer_pool
#   Description: Creates an OpenStack Load Balancer Pool for the specified
#                Load Balancer listener with either neutron LBaaS or Octavia
#   Params:
#       name: Name to give to the load balancer listener.
#       protocol: Whether it is HTTP, HTTPS, TCP, etc.
#       algorithm: Load Balancing algorithm to use.
#       listener: Id or name of the Load Balancer Listener we want to add the
#                 pool to.
#       project_id: Id of the project where this pool belongs to.
#       lb: Id or name of the Load Balancer we want to add the pool to
#           (optional).
function create_load_balancer_pool {
    local name
    local protocol
    local algorithm
    local listener
    local lb
    local project_id

    name="$1"
    protocol="$2"
    algorithm="$3"
    listener="$4"
    project_id="$5"
    lb="$6"

    # We must wait for the LB to be active before we can put a Pool for it
    wait_for_lb $lb

    openstack loadbalancer pool create --name "$name" \
        --listener "$listener" \
        --protocol "$protocol" \
        --lb-algorithm "$algorithm"
}

# create_load_balancer_member
#   Description: Creates an OpenStack load balancer pool member
#   Params:
#       name: Name to give to the load balancer pool member.
#       address: Whether it is HTTP, HTTPS, TCP, etc.
#       port: Port number the pool member is listening on.
#       pool: Id or name of the Load Balancer pool this member belongs to.
#       subnet: Id or name of the subnet the member address belongs to.
#       lb: Id or name of the load balancer the member belongs to.
#       project_id: Id of the project where this pool belongs to.
function create_load_balancer_member {
    local name
    local address
    local port
    local pool
    local subnet
    local lb
    local project_id

    name="$1"
    address="$2"
    port="$3"
    pool="$4"
    subnet="$5"
    lb="$6"
    project_id="$7"

    # We must wait for the pool creation update before we can add members
    wait_for_lb $lb

    openstack loadbalancer member create --name "$name" \
        --address "$address" \
        --protocol-port "$port" \
        "$pool"
}

# split_subnet
#   Description: Splits a subnet in two subnets that constitute its halves
#   Params:
#       cidr: Subnet CIDR to split
#   Returns: tab separated CIDRs of the two halves.
function split_subnet {
    # precondition: The passed cidr must be of a prefix <= 30
    python3 - <<EOF "$@"
import sys

from netaddr import IPNetwork
import six


n = IPNetwork(six.text_type(sys.argv[1]))
first, last = n.subnet(n.prefixlen+1)

print("%s\\t%s" % (first, last))
EOF
}

# get_loadbalancer_attribute
#   Description: Get load balancer attribute
#   Params:
#       lb_name: Load balancer name
#       lb_attr: attribute name
function get_loadbalancer_attribute {
    local lb_name
    local lb_attr

    lb_name="$1"
    lb_attr="$2"

    openstack loadbalancer show "$lb_name" -c "$lb_attr" -f value
}

# openshift_node_set_dns_config
#   Description: Configures Openshift node's DNS section atomically
#   Params:
#       node_conf_path: path_to_node_config
#       upstream_dns_ip: IP of the upstream DNS
function openshift_node_set_dns_config {
    local openshift_dnsmasq_recursive_resolv
    local upstream_dns_ip
    openshift_dnsmasq_recursive_resolv="${OPENSHIFT_DATA_DIR}/node/resolv.conf"

    upstream_dns_ip="$2"
    cat > "$openshift_dnsmasq_recursive_resolv" << EOF
nameserver $upstream_dns_ip
EOF

    python3 - <<EOF "$@"
import os
import sys
import tempfile
import traceback
import yaml

if len(sys.argv) < 3:
    sys.exit(1)
node_conf_path = sys.argv[1]
conf_dir = os.path.dirname(node_conf_path)

def dns_configure_copy(conf):
    new_conf = conf.copy()
    # 127.0.0.1 is used by unbound in gates, let's use another localshost addr
    new_conf['dnsBindAddress'] = '127.0.0.11:53'
    new_conf['dnsDomain'] = 'cluster.local'
    new_conf['dnsIP'] = '0.0.0.0'
    new_conf['dnsRecursiveResolvConf'] = '${openshift_dnsmasq_recursive_resolv}'
    return new_conf

old_config = {}
while True:
    tp = tempfile.NamedTemporaryFile(dir=conf_dir, delete=False, mode='w')
    try:
        with open(node_conf_path) as node_conf:
            current_conf = yaml.load(node_conf.read())
            if current_conf == old_config:
                tp.write(yaml.dump(new_conf, default_flow_style=False))
                tp.flush()
                os.fsync(tp.fileno())
                tp.close()
                os.rename(tp.name, node_conf_path)
                break
            else:
                new_conf = dns_configure_copy(current_conf)
                old_config = current_conf
                tp.close()
                os.unlink(tp.name)
    except Exception as e:
        traceback.print_exc(file=sys.stdout)
        tp.close()
        os.unlink(tp.name)
EOF
}

# run_openshift_dnsmasq
#   Description: Configures and runs a dnsmasq instance to be run as the node
#       DNS server that will choose between openshift's DNS and the
#       upstream DNS depending on the domain
#   Params:
#       upstream_dns_ip: IP of the upstream DNS
function run_openshift_dnsmasq {
    local dnmasq_binary
    local cmd
    local upstream_dns_ip
    local openshift_dnsmasq_conf_path
    local search_domains

    upstream_dns_ip="$1"
    openshift_dnsmasq_conf_path="${OPENSHIFT_DATA_DIR}/node/node_dnsmasq.conf"
    install_package dnsmasq
    cat > "$openshift_dnsmasq_conf_path" << EOF
server=${upstream_dns_ip}
no-resolv
domain-needed
no-negcache
max-cache-ttl=1
# Enable dbus so openshift dns can use it to set cluster.local rules
enable-dbus
dns-forward-max=10000
cache-size=10000
bind-dynamic
# Do not bind to localhost addresses 127.0.0.1/8 (where skydns binds)
except-interface=lo
EOF

    #Open port 53 so pods can reach the DNS server
    sudo iptables -I INPUT 1 -p udp -m udp --dport 53 -m comment --comment "kuryr-devstack: Access to OpenShift API" -j ACCEPT

    dnsmasq_binary="$(command -v dnsmasq)"
    cmd="${dnsmasq_binary} -k -C ${openshift_dnsmasq_conf_path}"
    run_process openshift-dnsmasq "$cmd" root root

    sudo cp /etc/resolv.conf /etc/resolv.conf.orig
    search_domains=$(awk '/search/ {for (i=2; i<NF; i++) printf $i " "; print $NF}' /etc/resolv.conf.orig)
    search_domains="cluster.local ${search_domains}"
    echo "search ${search_domains}" | sudo tee /etc/resolv.conf.openshift_devstack
    echo "options ndots:4" | sudo tee /etc/resolv.conf.openshift_devstack
    echo "nameserver ${HOST_IP}" | sudo tee --append /etc/resolv.conf.openshift_devstack
    grep "nameserver" /etc/resolv.conf.orig | sudo tee --append  /etc/resolv.conf.openshift_devstack
    sudo mv /etc/resolv.conf.openshift_devstack /etc/resolv.conf
}

function reinstate_old_dns_config {
    sudo mv /etc/resolv.conf.orig /etc/resolv.conf
}


# run_openshift_dns
#   Description: Starts openshift's DNS
function run_openshift_dns {
    local command

    command="/usr/local/bin/openshift start network \
        --enable=dns \
        --config=${OPENSHIFT_DATA_DIR}/node/node-config.yaml \
        --kubeconfig=${OPENSHIFT_DATA_DIR}/node/node.kubeconfig"

    run_process openshift-dns "$command" root root
}

# cleanup_kuryr_devstack_iptables
#    Description: Fins all the iptables rules we set and deletes them
function cleanup_kuryr_devstack_iptables {
    local chains

    chains=( INPUT FORWARD OUTPUT )
    for chain in ${chains[@]}; do
        sudo iptables -n -L "$chain" -v --line-numbers | \
            awk -v chain="$chain" \
                '/kuryr-devstack/ {print "sudo iptables -D " chain " " $1}' | \
            tac | bash /dev/stdin
    done
}

# run_openshift_registry
#   Description: Deploys Openshift's registry as a DeploymentConfig
function run_openshift_registry {
    local registry_yaml
    local registry_ip="$1"

    mkdir -p "${OPENSHIFT_DATA_DIR}/registry"
    registry_yaml=$(mktemp)
    oc adm registry \
        --config=${OPENSHIFT_DATA_DIR}/master/admin.kubeconfig \
        --service-account=registry \
        --mount-host=${OPENSHIFT_DATA_DIR}/registry \
        --tls-certificate=${OPENSHIFT_DATA_DIR}/master/registry.crt \
        --tls-key=${OPENSHIFT_DATA_DIR}/master/registry.key \
        -o yaml > $registry_yaml

    python3 - <<EOF "$registry_yaml" "$registry_ip"
import copy
import os
import sys
import tempfile
import traceback
import yaml

if len(sys.argv) < 3:
    sys.exit(1)
registry_conf_path = sys.argv[1]
registry_cluster_ip = sys.argv[2]
conf_dir = os.path.dirname(registry_conf_path)

def service_configure_registry_clusterIP(conf):
    new_conf = copy.deepcopy(conf)
    for object in new_conf['items']:
        if object['kind'] == 'Service':
            object['spec']['clusterIP'] = registry_cluster_ip
    return new_conf

old_conf = {}
while True:
    tp = tempfile.NamedTemporaryFile(dir=conf_dir, delete=False, mode='w')
    try:
        with open(registry_conf_path) as registry_conf:
            current_conf = yaml.load(registry_conf.read())
            if current_conf == old_conf:
                tp.write(yaml.dump(new_conf, default_flow_style=False))
                tp.flush()
                os.fsync(tp.fileno())
                tp.close()
                os.rename(tp.name, registry_conf_path)
                break
            else:
                new_conf = service_configure_registry_clusterIP(current_conf)
                old_conf = current_conf
                tp.close()
                os.unlink(tp.name)
    except Exception as e:
        traceback.print_exc(file=sys.stdout)
        tp.close()
        os.unlink(tp.name)
EOF

oc adm policy add-scc-to-user privileged -z registry -n default
oc create -f "$registry_yaml"
}

# oc_generate_server_certificates
#   Description: Generates and CA signs openshift cert & key for server
#   Params:
#     - name: filename without extension of the cert and key
#     - hostnames: the comma separated hostnames to sign the cert for
function oc_generate_server_certificates {
    local name
    local cert_hostnames

    name="$1"
    cert_hostnames="$2"
    oc adm ca create-server-cert \
    --signer-cert="${OPENSHIFT_DATA_DIR}/master/ca.crt" \
    --signer-key="${OPENSHIFT_DATA_DIR}/master/ca.key" \
    --signer-serial="${OPENSHIFT_DATA_DIR}/master/ca.serial.txt" \
    --hostnames="$cert_hostnames" \
    --cert="${OPENSHIFT_DATA_DIR}/master/${name}.crt" \
    --key="${OPENSHIFT_DATA_DIR}/master/${name}.key"
}

# docker_install_ca_certs
#   Description: Installs registry openshift_ca_certs to docker
#   Params:
#     - registry_hostnames: the comma separated hostnames to give the CA for
function docker_install_ca_certs {
    local registry_hostnames
    local destdir

    # TODO(dulek): Support for CRI-O.
    registry_hostnames=(${1//,/ })
    for hostname in ${registry_hostnames[@]}; do
        destdir="/etc/docker/certs.d/${hostname}:5000"
        sudo install -d -o "$STACK_USER" "$destdir"
        sudo install -o "$STACK_USER" "${OPENSHIFT_DATA_DIR}/master/ca.crt" "${destdir}/"
    done
}


function _nth_cidr_ip {
    local cidr
    local position

    cidr="$1"
    position="$2"
    python3 - <<EOF "$cidr" "$position"
import sys
from netaddr import IPAddress, IPNetwork

cmdname, cidr, position = sys.argv
n = IPNetwork(cidr)
print("%s" % IPAddress(n.first + int(position)))
EOF
}

function configure_and_run_registry {
    local service_cidr
    local registry_ip
    local hostnames

    # TODO(dulek): Support for CRI-O.
    service_cidr=$(openstack --os-cloud devstack-admin \
                             --os-region "$REGION_NAME" \
                             subnet show "$KURYR_NEUTRON_DEFAULT_SERVICE_SUBNET" \
                             -c cidr -f value)
    registry_ip=$(_nth_cidr_ip "$service_cidr" 2)
    hostnames="docker-registry.default.svc.cluster.local,docker-registry.default.svc,${registry_ip}"

    docker_install_ca_certs "$hostnames"
    oc_generate_server_certificates registry "$hostnames"
    run_openshift_registry "$registry_ip"
}