ipam/host-local: Move allocator and config to backend

Signed-off-by: André Martins <aanm90@gmail.com>

plugins/ipam/host-local/backend/allocator/config.go

@@ -0,0 +1,71 @@
+// Copyright 2015 CNI authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package allocator
+
+import (
+	"encoding/json"
+	"fmt"
+	"net"
+
+	"github.com/containernetworking/cni/pkg/types"
+)
+
+// IPAMConfig represents the IP related network configuration.
+type IPAMConfig struct {
+	Name       string
+	Type       string        `json:"type"`
+	RangeStart net.IP        `json:"rangeStart"`
+	RangeEnd   net.IP        `json:"rangeEnd"`
+	Subnet     types.IPNet   `json:"subnet"`
+	Gateway    net.IP        `json:"gateway"`
+	Routes     []types.Route `json:"routes"`
+	DataDir    string        `json:"dataDir"`
+	Args       *IPAMArgs     `json:"-"`
+}
+
+type IPAMArgs struct {
+	types.CommonArgs
+	IP net.IP `json:"ip,omitempty"`
+}
+
+type Net struct {
+	Name string      `json:"name"`
+	IPAM *IPAMConfig `json:"ipam"`
+}
+
+// NewIPAMConfig creates a NetworkConfig from the given network name.
+func LoadIPAMConfig(bytes []byte, args string) (*IPAMConfig, error) {
+	n := Net{}
+	if err := json.Unmarshal(bytes, &n); err != nil {
+		return nil, err
+	}
+
+	if args != "" {
+		n.IPAM.Args = &IPAMArgs{}
+		err := types.LoadArgs(args, n.IPAM.Args)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if n.IPAM == nil {
+		return nil, fmt.Errorf("IPAM config missing 'ipam' key")
+	}
+
+	// Copy net name into IPAM so not to drag Net struct around
+	n.IPAM.Name = n.Name
+
+	return n.IPAM, nil
+}