blob: f50e554c4c916434702e244dda4fe92ea76fa874 [file] [log] [blame]
/*
* Copyright (c) 2018 - present. Boling Consulting Solutions (bcsw.net)
* Copyright 2020-present Open Networking Foundation
* 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 meframe
import (
"errors"
"fmt"
"github.com/google/gopacket"
. "github.com/opencord/omci-lib-go"
me "github.com/opencord/omci-lib-go/generated"
)
func GetRequestFrame(m *me.ManagedEntity, opt options) (gopacket.SerializableLayer, error) {
// Given mask sent in (could be default of 0xFFFF) get what is allowable.
// This will be all allowed if 0xFFFF is passed in, or a subset if a fixed
// number of items.
maxMask, err := checkAttributeMask(m, opt.attributeMask)
if err != nil {
return nil, err
}
// Now scan attributes and reduce mask to only those requested
var mask uint16
mask, err = calculateAttributeMask(m, maxMask)
if err != nil {
return nil, err
}
if mask == 0 {
// TODO: Is a Get request with no attributes valid?
return nil, errors.New("no attributes requested for GetRequest")
}
meLayer := &GetRequest{
MeBasePacket: MeBasePacket{
EntityClass: m.GetClassID(),
EntityInstance: m.GetEntityID(),
Extended: opt.frameFormat == ExtendedIdent,
},
AttributeMask: mask,
}
return meLayer, nil
}
func GetResponseFrame(m *me.ManagedEntity, opt options) (gopacket.SerializableLayer, error) {
mask, err := checkAttributeMask(m, opt.attributeMask)
if err != nil {
return nil, err
}
mask, err = calculateAttributeMask(m, mask)
if err != nil {
return nil, err
}
meLayer := &GetResponse{
MeBasePacket: MeBasePacket{
EntityClass: m.GetClassID(),
EntityInstance: m.GetEntityID(),
Extended: opt.frameFormat == ExtendedIdent,
},
Result: opt.result,
AttributeMask: 0,
Attributes: make(me.AttributeValueMap),
}
if meLayer.Result == me.AttributeFailure {
meLayer.UnsupportedAttributeMask = opt.unsupportedMask
meLayer.FailedAttributeMask = opt.attrExecutionMask
}
// Encode whatever we can
if meLayer.Result == me.Success || meLayer.Result == me.AttributeFailure {
// Encode results
// Get payload space available
maxPayload := maxPacketAvailable(m, opt)
payloadAvailable := int(maxPayload) - 2 - 4 // Less attribute mask and attribute error encoding
meDefinition := m.GetManagedEntityDefinition()
attrDefs := meDefinition.GetAttributeDefinitions()
attrMap := m.GetAttributeValueMap()
if mask != 0 {
// Iterate down the attributes (Attribute 0 is the ManagedEntity ID)
var attrIndex uint
for attrIndex = 1; attrIndex <= 16; attrIndex++ {
// Is this attribute requested
if mask&(1<<(16-attrIndex)) != 0 {
// Get definitions since we need the name
attrDef, ok := attrDefs[attrIndex]
if !ok {
msg := fmt.Sprintf("Unexpected error, index %v not valued for ME %v",
attrIndex, meDefinition.GetName())
return nil, errors.New(msg)
}
var attrValue interface{}
attrValue, ok = attrMap[attrDef.Name]
if !ok {
msg := fmt.Sprintf("Unexpected error, attribute %v not provided in ME %v: %v",
attrDef.GetName(), meDefinition.GetName(), m)
return nil, errors.New(msg)
}
// Is space available?
if attrDef.Size <= payloadAvailable {
// Mark bit handled
mask &= ^attrDef.Mask
meLayer.AttributeMask |= attrDef.Mask
meLayer.Attributes[attrDef.Name] = attrValue
payloadAvailable -= attrDef.Size
} else if opt.failIfTruncated {
// TODO: Should we set truncate?
msg := fmt.Sprintf("out-of-space. Cannot fit attribute %v into GetResponse message",
attrDef.GetName())
return nil, me.NewMessageTruncatedError(msg)
} else {
// Add to existing 'failed' mask and update result
meLayer.FailedAttributeMask |= attrDef.Mask
meLayer.Result = me.AttributeFailure
}
}
}
}
}
return meLayer, nil
}