1 files changed, 70 insertions, 0 deletions
diff --git a/core/trace.go b/core/trace.go
new file mode 100644
index 0000000..b818657
--- /dev/null
+++ b/core/trace.go
@@ -0,0 +1,70 @@
+// Copyright (c) 2021 Cisco and/or its affiliates.
+//
+// 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 core
+
+import (
+	"go.fd.io/govpp/api"
+	"sort"
+	"sync"
+	"sync/atomic"
+)
+
+// trace is the API tracer object synchronizing and keeping recoded messages.
+type trace struct {
+	list []*api.Record
+	mux  *sync.Mutex
+
+	isEnabled int32
+}
+
+func (c *trace) Enable(enable bool) {
+	if enable && atomic.CompareAndSwapInt32(&c.isEnabled, 0, 1) {
+		log.Debugf("API trace enabled")
+	} else if atomic.CompareAndSwapInt32(&c.isEnabled, 1, 0) {
+		log.Debugf("API trace disabled")
+	}
+}
+
+func (c *trace) GetRecords() (list []*api.Record) {
+	c.mux.Lock()
+	for _, entry := range c.list {
+		list = append(list, entry)
+	}
+	c.mux.Unlock()
+	sort.Slice(list, func(i, j int) bool {
+		return list[i].Timestamp.Before(list[j].Timestamp)
+	})
+	return list
+}
+
+func (c *trace) GetRecordsForChannel(chId uint16) (list []*api.Record) {
+	c.mux.Lock()
+	for _, entry := range c.list {
+		if entry.ChannelID == chId {
+			list = append(list, entry)
+		}
+	}
+	c.mux.Unlock()
+	sort.Slice(list, func(i, j int) bool {
+		return list[i].Timestamp.Before(list[j].Timestamp)
+	})
+	return list
+}
+
+func (c *trace) Clear() {
+	c.mux.Lock()
+	c.list = make([]*api.Record, 0)
+	c.mux.Unlock()
+}