VOL-4788 : Lib in in voltha-libs-go for support of prometheus counters in voltha
Change-Id: I1a4a81f775595b89dbc2a5e4411e84034e30e1af
diff --git a/pkg/stats/manager.go b/pkg/stats/manager.go
new file mode 100644
index 0000000..fdc8cc0
--- /dev/null
+++ b/pkg/stats/manager.go
@@ -0,0 +1,76 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+
+ * 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 stats
+
+import (
+ "context"
+ "time"
+)
+
+type CollectorName string
+
+const (
+ OltAdapter CollectorName = "adapter_olt"
+ OnuAdapter CollectorName = "adapter_onu"
+ VCore CollectorName = "rw_core"
+)
+
+func (s CollectorName) String() string {
+ switch s {
+ case OltAdapter:
+ return "adapter_olt"
+ case OnuAdapter:
+ return "adapter_onu"
+ case VCore:
+ return "rw_core"
+ }
+ return "unknown"
+}
+
+type StatsManager interface {
+ // Start starts the statistics manager with name and makes the collected stats available at port p.
+ Start(ctx context.Context, p int, name CollectorName)
+
+ //CountForDevice counts the number of times the counterName happens for device devId with serial number sn. Each call to Count increments it by one.
+ CountForDevice(devId, sn string, counterName DeviceCounter)
+
+ //AddForDevice adds val to counter.
+ AddForDevice(devId, sn string, counter DeviceCounter, val float64)
+
+ //CollectDurationForDevice calculates the duration from startTime to time.Now() for device devID with serial number sn.
+ CollectDurationForDevice(devID, sn string, dName NonDeviceDuration, startTime time.Time)
+
+ //Count counts the number of times the counterName happens. Each call to Count increments it by one.
+ Count(counter NonDeviceCounter)
+
+ //Add adds val to counter.
+ Add(counter NonDeviceCounter, val float64)
+
+ //CollectDuration calculates the duration from startTime to time.Now().
+ CollectDuration(dName NonDeviceDuration, startTime time.Time)
+}
+
+type NullStatsServer struct {
+}
+
+func (n *NullStatsServer) Start(ctx context.Context, p int, name CollectorName) {}
+func (n *NullStatsServer) CountForDevice(devId, sn string, counterName DeviceCounter) {}
+func (n *NullStatsServer) AddForDevice(devId, sn string, counter DeviceCounter, val float64) {}
+func (n *NullStatsServer) CollectDurationForDevice(devID, sn string, dName NonDeviceDuration, startTime time.Time) {
+}
+func (n *NullStatsServer) Count(counter NonDeviceCounter) {}
+func (n *NullStatsServer) Add(counter NonDeviceCounter, val float64) {}
+func (n *NullStatsServer) CollectDuration(dName NonDeviceDuration, startTime time.Time) {}