106 lines
2.2 KiB
Go
106 lines
2.2 KiB
Go
/*
|
|
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 trace
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/binary"
|
|
"errors"
|
|
"github.com/openziti/channel/v3/trace/pb"
|
|
"google.golang.org/protobuf/proto"
|
|
"io"
|
|
"os"
|
|
)
|
|
|
|
type messageHandler interface {
|
|
Handle(msg interface{}) error
|
|
}
|
|
|
|
func Read(path string, handler messageHandler) error {
|
|
f, err := os.OpenFile(path, os.O_RDONLY, os.ModePerm)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
for {
|
|
typeData := make([]byte, 4)
|
|
n, err := f.Read(typeData)
|
|
if err == io.EOF {
|
|
return nil
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if n != 4 {
|
|
return errors.New("short read")
|
|
}
|
|
buf := bytes.NewBuffer(typeData)
|
|
var messageType int32
|
|
err = binary.Read(buf, binary.LittleEndian, &messageType)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
lenData := make([]byte, 4)
|
|
n, err = f.Read(lenData)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if n != 4 {
|
|
return errors.New("short read")
|
|
}
|
|
buf = bytes.NewBuffer(lenData)
|
|
var len int32 = -1
|
|
err = binary.Read(buf, binary.LittleEndian, &len)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
data := make([]byte, len)
|
|
n, err = f.Read(data)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if int32(n) != len {
|
|
return errors.New("short read")
|
|
}
|
|
|
|
switch messageType {
|
|
case int32(trace_pb.MessageType_ChannelStateType):
|
|
cs := &trace_pb.ChannelState{}
|
|
if err = proto.Unmarshal(data, cs); err != nil {
|
|
return err
|
|
}
|
|
if err = handler.Handle(cs); err != nil {
|
|
return err
|
|
}
|
|
|
|
case int32(trace_pb.MessageType_ChannelMessageType):
|
|
cm := &trace_pb.ChannelMessage{}
|
|
if err = proto.Unmarshal(data, cm); err != nil {
|
|
return err
|
|
}
|
|
if err = handler.Handle(cm); err != nil {
|
|
return err
|
|
}
|
|
|
|
default:
|
|
return errors.New("unexpected message")
|
|
}
|
|
}
|
|
}
|