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decoder.go
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decoder.go
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/*
Copyright NetFoundry Inc.
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
https://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 xgress
import (
"fmt"
"github.com/michaelquigley/pfxlog"
"github.com/openziti/channel/v2"
)
type Decoder struct{}
const DECODER = "data"
func (d Decoder) Decode(msg *channel.Message) ([]byte, bool) {
switch msg.ContentType {
case int32(ContentTypePayloadType):
if payload, err := UnmarshallPayload(msg); err == nil {
return DecodePayload(payload)
} else {
pfxlog.Logger().WithError(err).Error("unexpected error unmarshalling payload msg")
}
case int32(ContentTypeAcknowledgementType):
if ack, err := UnmarshallAcknowledgement(msg); err == nil {
meta := channel.NewTraceMessageDecode(DECODER, "Acknowledgement")
meta["circuitId"] = ack.CircuitId
meta["sequence"] = fmt.Sprintf("len(%d)", len(ack.Sequence))
switch ack.GetOriginator() {
case Initiator:
meta["originator"] = "i"
case Terminator:
meta["originator"] = "e"
}
data, err := meta.MarshalTraceMessageDecode()
if err != nil {
return nil, true
}
return data, true
} else {
pfxlog.Logger().WithError(err).Error("unexpected error unmarshalling ack msg")
}
case int32(ContentTypeControlType):
if control, err := UnmarshallControl(msg); err == nil {
meta := channel.NewTraceMessageDecode(DECODER, "Control")
meta["circuitId"] = control.CircuitId
meta["type"] = control.Type.String()
if control.Type == ControlTypeTraceRoute || control.Type == ControlTypeTraceRouteResponse {
if ts, found := msg.GetUint64Header(ControlTimestamp); found {
meta["ts"] = ts
}
if hop, found := msg.GetUint32Header(ControlHopCount); found {
meta["hopCount"] = hop
}
if hopType, found := msg.GetStringHeader(ControlHopType); found {
meta["hopType"] = hopType
}
if hopId, found := msg.GetStringHeader(ControlHopId); found {
meta["hopId"] = hopId
}
if userVal, found := msg.GetUint32Header(ControlUserVal); found {
meta["uv"] = userVal
}
if hopErr, found := msg.GetUint32Header(ControlError); found {
meta["err"] = hopErr
}
}
data, err := meta.MarshalTraceMessageDecode()
if err != nil {
return nil, true
}
return data, true
} else {
pfxlog.Logger().WithError(err).Error("unexpected error unmarshalling control msg")
}
}
return nil, false
}
func DecodePayload(payload *Payload) ([]byte, bool) {
meta := channel.NewTraceMessageDecode(DECODER, "Payload")
meta["circuitId"] = payload.CircuitId
meta["sequence"] = payload.Sequence
switch payload.GetOriginator() {
case Initiator:
meta["originator"] = "i"
case Terminator:
meta["originator"] = "e"
}
if payload.Flags != 0 {
meta["flags"] = payload.Flags
}
meta["length"] = len(payload.Data)
data, err := meta.MarshalTraceMessageDecode()
if err != nil {
return nil, true
}
return data, true
}