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fabric.go
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fabric.go
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// Copyright 2016 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package gomaasapi
import (
"github.com/juju/errors"
"github.com/juju/schema"
"github.com/juju/version"
)
type fabric struct {
// Add the controller in when we need to do things with the fabric.
// controller Controller
resourceURI string
id int
name string
classType string
vlans []*vlan
}
// ID implements Fabric.
func (f *fabric) ID() int {
return f.id
}
// Name implements Fabric.
func (f *fabric) Name() string {
return f.name
}
// ClassType implements Fabric.
func (f *fabric) ClassType() string {
return f.classType
}
// VLANs implements Fabric.
func (f *fabric) VLANs() []VLAN {
var result []VLAN
for _, v := range f.vlans {
result = append(result, v)
}
return result
}
func readFabrics(controllerVersion version.Number, source interface{}) ([]*fabric, error) {
checker := schema.List(schema.StringMap(schema.Any()))
coerced, err := checker.Coerce(source, nil)
if err != nil {
return nil, errors.Annotatef(err, "fabric base schema check failed")
}
valid := coerced.([]interface{})
var deserialisationVersion version.Number
for v := range fabricDeserializationFuncs {
if v.Compare(deserialisationVersion) > 0 && v.Compare(controllerVersion) <= 0 {
deserialisationVersion = v
}
}
if deserialisationVersion == version.Zero {
return nil, errors.Errorf("no fabric read func for version %s", controllerVersion)
}
readFunc := fabricDeserializationFuncs[deserialisationVersion]
return readFabricList(valid, readFunc)
}
// readFabricList expects the values of the sourceList to be string maps.
func readFabricList(sourceList []interface{}, readFunc fabricDeserializationFunc) ([]*fabric, error) {
result := make([]*fabric, 0, len(sourceList))
for i, value := range sourceList {
source, ok := value.(map[string]interface{})
if !ok {
return nil, errors.Errorf("unexpected value for fabric %d, %T", i, value)
}
fabric, err := readFunc(source)
if err != nil {
return nil, errors.Annotatef(err, "fabric %d", i)
}
result = append(result, fabric)
}
return result, nil
}
type fabricDeserializationFunc func(map[string]interface{}) (*fabric, error)
var fabricDeserializationFuncs = map[version.Number]fabricDeserializationFunc{
twoDotOh: fabric_2_0,
}
func fabric_2_0(source map[string]interface{}) (*fabric, error) {
fields := schema.Fields{
"resource_uri": schema.String(),
"id": schema.ForceInt(),
"name": schema.String(),
"class_type": schema.OneOf(schema.Nil(""), schema.String()),
"vlans": schema.List(schema.StringMap(schema.Any())),
}
checker := schema.FieldMap(fields, nil) // no defaults
coerced, err := checker.Coerce(source, nil)
if err != nil {
return nil, errors.Annotatef(err, "fabric 2.0 schema check failed")
}
valid := coerced.(map[string]interface{})
// From here we know that the map returned from the schema coercion
// contains fields of the right type.
vlans, err := readVLANList(valid["vlans"].([]interface{}), vlan_2_0)
if err != nil {
return nil, errors.Trace(err)
}
// Since the class_type is optional, we use the two part cast assignment. If
// the cast fails, then we get the default value we care about, which is the
// empty string.
classType, _ := valid["class_type"].(string)
result := &fabric{
resourceURI: valid["resource_uri"].(string),
id: valid["id"].(int),
name: valid["name"].(string),
classType: classType,
vlans: vlans,
}
return result, nil
}