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channel_peekhandler.go
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/
channel_peekhandler.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 trace
import (
"fmt"
"github.com/michaelquigley/pfxlog"
"github.com/openziti/channel/v2"
"github.com/openziti/channel/v2/trace/pb"
"github.com/openziti/ziti/common/pb/ctrl_pb"
"github.com/openziti/ziti/common/pb/mgmt_pb"
"github.com/openziti/ziti/router/xgress"
"github.com/openziti/foundation/v2/concurrenz"
"google.golang.org/protobuf/proto"
"sync/atomic"
"time"
)
var decoders = []channel.TraceMessageDecoder{channel.Decoder{}, ctrl_pb.Decoder{}, xgress.Decoder{}, mgmt_pb.Decoder{}}
type ChannelPeekHandler struct {
appId string
ch channel.Channel
enabled atomic.Bool
controller Controller
decoders []channel.TraceMessageDecoder
eventSinks concurrenz.CopyOnWriteSlice[EventHandler]
}
func (self *ChannelPeekHandler) EnableTracing(sourceType SourceType, matcher SourceMatcher, handler EventHandler, resultChan chan<- ToggleApplyResult) {
self.ToggleTracing(sourceType, matcher, true, handler, resultChan)
}
func (self *ChannelPeekHandler) DisableTracing(sourceType SourceType, matcher SourceMatcher, handler EventHandler, resultChan chan<- ToggleApplyResult) {
self.ToggleTracing(sourceType, matcher, false, handler, resultChan)
}
func (self *ChannelPeekHandler) ToggleTracing(sourceType SourceType, matcher SourceMatcher, enable bool, handler EventHandler, resultChan chan<- ToggleApplyResult) {
name := self.ch.LogicalName()
matched := sourceType == SourceTypePipe && matcher.Matches(name)
prevState := self.IsEnabled()
nextState := prevState
if matched {
nextState = enable
if enable {
self.enabled.Store(true)
self.eventSinks.Append(handler)
} else {
self.eventSinks.Delete(handler)
if len(self.eventSinks.Value()) == 0 {
self.enabled.Store(false)
}
}
}
resultChan <- &ToggleApplyResultImpl{matched,
fmt.Sprintf("Link %v.%v matched? %v. Old trace state: %v, New trace state: %v",
self.appId, name, matched, prevState, nextState)}
}
func NewChannelPeekHandler(appId string, ch channel.Channel, controller Controller) *ChannelPeekHandler {
handler := &ChannelPeekHandler{
appId: appId,
ch: ch,
controller: controller,
decoders: decoders,
}
controller.AddSource(handler)
return handler
}
func (self *ChannelPeekHandler) IsEnabled() bool {
return self.enabled.Load()
}
func (*ChannelPeekHandler) Connect(channel.Channel, string) {
}
func (self *ChannelPeekHandler) Rx(msg *channel.Message, ch channel.Channel) {
self.trace(msg, ch, false)
}
func (self *ChannelPeekHandler) Tx(msg *channel.Message, ch channel.Channel) {
self.trace(msg, ch, true)
}
func (self *ChannelPeekHandler) Close(channel.Channel) {
self.controller.RemoveSource(self)
}
func (self *ChannelPeekHandler) trace(msg *channel.Message, ch channel.Channel, rx bool) {
if !self.IsEnabled() || msg.ContentType == int32(ctrl_pb.ContentType_TraceEventType) ||
msg.ContentType == int32(mgmt_pb.ContentType_StreamTracesEventType) {
return
}
var decode []byte
for _, decoder := range self.decoders {
if str, ok := decoder.Decode(msg); ok {
decode = str
break
}
}
traceMsg := &trace_pb.ChannelMessage{
Timestamp: time.Now().UnixNano(),
Identity: self.appId,
Channel: ch.LogicalName(),
IsRx: rx,
ContentType: msg.ContentType,
Sequence: msg.Sequence(),
ReplyFor: msg.ReplyFor(),
Length: int32(len(msg.Body)),
Decode: decode,
}
// This can result in a message send. Doing a send from inside a peekhandler can cause deadlocks, so it's best avoided
for _, eventSink := range self.eventSinks.Value() {
go eventSink.Accept(traceMsg)
}
}
func NewChannelSink(ch channel.Channel) EventHandler {
return &channelSink{ch}
}
type channelSink struct {
ch channel.Channel
}
func (sink *channelSink) Accept(event *trace_pb.ChannelMessage) {
log := pfxlog.Logger()
bytes, err := proto.Marshal(event)
if err != nil {
log.Errorf("Failed to encode metrics message: %v", err)
return
}
chMsg := channel.NewMessage(int32(ctrl_pb.ContentType_TraceEventType), bytes)
err = sink.ch.Send(chMsg)
if err != nil {
log.Errorf("Failed to send trace message: %v", err)
} else {
log.Tracef("Reported trace to fabric controller")
}
}