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// Copyright (c) 2019 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 adapter
import (
"errors"
"fmt"
)
const (
// DefaultStatsSocket defines a default socket file path for VPP stats API.
DefaultStatsSocket = "/run/vpp/stats.sock"
)
var (
ErrStatDirBusy = errors.New("stat dir busy")
ErrStatDumpBusy = errors.New("stat dump busy")
)
// StatsAPI provides connection to VPP stats API.
type StatsAPI interface {
// Connect establishes client connection to the stats API.
Connect() error
// Disconnect terminates client connection.
Disconnect() error
// ListStats lists names for all stats.
ListStats(patterns ...string) (statNames []string, err error)
// DumpStats dumps all stat entries.
DumpStats(patterns ...string) ([]*StatEntry, error)
}
// StatType represents type of stat directory and simply
// defines what type of stat data is stored in the stat entry.
type StatType int
const (
_ StatType = 0
ScalarIndex StatType = 1
SimpleCounterVector StatType = 2
CombinedCounterVector StatType = 3
ErrorIndex StatType = 4
NameVector StatType = 5
)
func (d StatType) String() string {
switch d {
case ScalarIndex:
return "ScalarIndex"
case SimpleCounterVector:
return "SimpleCounterVector"
case CombinedCounterVector:
return "CombinedCounterVector"
case ErrorIndex:
return "ErrorIndex"
case NameVector:
return "NameVector"
}
return fmt.Sprintf("UnknownStatType(%d)", d)
}
// StatEntry represents single stat entry. The type of stat stored in Data
// is defined by Type.
type StatEntry struct {
Name string
Type StatType
Data Stat
}
// Counter represents simple counter with single value.
type Counter uint64
// CombinedCounter represents counter with two values, for packet count and bytes count.
type CombinedCounter struct {
Packets Counter
Bytes Counter
}
// Name represents string value stored under name vector.
type Name string
// ScalarStat represents stat for ScalarIndex.
type ScalarStat float64
// ErrorStat represents stat for ErrorIndex.
type ErrorStat Counter
// SimpleCounterStat represents stat for SimpleCounterVector.
// The outer array represents workers and the inner array represents interface/node/.. indexes.
// Values should be aggregated per interface/node for every worker.
type SimpleCounterStat [][]Counter
// CombinedCounterStat represents stat for CombinedCounterVector.
// The outer array represents workers and the inner array represents interface/node/.. indexes.
// Values should be aggregated per interface/node for every worker.
type CombinedCounterStat [][]CombinedCounter
// NameStat represents stat for NameVector.
type NameStat []Name
// Data represents some type of stat which is usually defined by StatType.
type Stat interface {
// isStat is unexported to limit implementations of Data interface to this package,
isStat()
}
func (ScalarStat) isStat() {}
func (ErrorStat) isStat() {}
func (SimpleCounterStat) isStat() {}
func (CombinedCounterStat) isStat() {}
func (NameStat) isStat() {}
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