106 lines
2.2 KiB
Go
106 lines
2.2 KiB
Go
/*
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Copyright NetFoundry Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package trace
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import (
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"bytes"
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"encoding/binary"
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"errors"
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"github.com/openziti/channel/v4/trace/pb"
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"google.golang.org/protobuf/proto"
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"io"
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"os"
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)
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type messageHandler interface {
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Handle(msg interface{}) error
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}
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func Read(path string, handler messageHandler) error {
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f, err := os.OpenFile(path, os.O_RDONLY, os.ModePerm)
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if err != nil {
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return err
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}
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for {
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typeData := make([]byte, 4)
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n, err := f.Read(typeData)
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if err == io.EOF {
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return nil
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}
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if err != nil {
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return err
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}
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if n != 4 {
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return errors.New("short read")
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}
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buf := bytes.NewBuffer(typeData)
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var messageType int32
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err = binary.Read(buf, binary.LittleEndian, &messageType)
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if err != nil {
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return err
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}
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lenData := make([]byte, 4)
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n, err = f.Read(lenData)
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if err != nil {
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return err
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}
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if n != 4 {
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return errors.New("short read")
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}
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buf = bytes.NewBuffer(lenData)
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var len int32 = -1
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err = binary.Read(buf, binary.LittleEndian, &len)
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if err != nil {
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return err
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}
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data := make([]byte, len)
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n, err = f.Read(data)
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if err != nil {
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return err
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}
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if int32(n) != len {
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return errors.New("short read")
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}
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switch messageType {
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case int32(trace_pb.MessageType_ChannelStateType):
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cs := &trace_pb.ChannelState{}
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if err = proto.Unmarshal(data, cs); err != nil {
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return err
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}
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if err = handler.Handle(cs); err != nil {
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return err
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}
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case int32(trace_pb.MessageType_ChannelMessageType):
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cm := &trace_pb.ChannelMessage{}
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if err = proto.Unmarshal(data, cm); err != nil {
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return err
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}
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if err = handler.Handle(cm); err != nil {
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return err
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}
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default:
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return errors.New("unexpected message")
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}
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}
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}
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