1 // Copyright (c) 2019 Cisco and/or its affiliates.
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at:
7 // http://www.apache.org/licenses/LICENSE-2.0
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
23 // DefaultStatsSocket defines a default socket file path for VPP stats API.
24 DefaultStatsSocket = "/run/vpp/stats.sock"
28 ErrStatsDataBusy = errors.New("stats data busy")
29 ErrStatsDirStale = errors.New("stats dir stale")
30 ErrStatsDisconnected = errors.New("stats disconnected")
31 ErrStatsAccessFailed = errors.New("stats access failed")
34 // StatsAPI provides connection to VPP stats API.
35 type StatsAPI interface {
36 // Connect establishes client connection to the stats API.
38 // Disconnect terminates client connection.
41 // ListStats lists names for stats matching patterns.
42 ListStats(patterns ...string) (names []string, err error)
43 // DumpStats dumps all stat entries.
44 DumpStats(patterns ...string) (entries []StatEntry, err error)
46 // PrepareDir prepares new stat dir for entries that match any of prefixes.
47 PrepareDir(patterns ...string) (*StatDir, error)
48 // UpdateDir updates stat dir and all of their entries.
49 UpdateDir(dir *StatDir) error
52 // StatType represents type of stat directory and simply
53 // defines what type of stat data is stored in the stat entry.
58 ScalarIndex StatType = 1
59 SimpleCounterVector StatType = 2
60 CombinedCounterVector StatType = 3
61 ErrorIndex StatType = 4
62 NameVector StatType = 5
66 func (d StatType) String() string {
70 case SimpleCounterVector:
71 return "SimpleCounterVector"
72 case CombinedCounterVector:
73 return "CombinedCounterVector"
81 return fmt.Sprintf("UnknownStatType(%d)", d)
84 // StatDir defines directory of stats entries created by PrepareDir.
91 // StatEntry represents single stat entry. The type of stat stored in Data
92 // is defined by Type.
93 type StatEntry struct {
99 // Counter represents simple counter with single value, which is usually packet count.
102 // CombinedCounter represents counter with two values, for packet count and bytes count.
103 type CombinedCounter [2]uint64
105 func (s CombinedCounter) Packets() uint64 {
109 func (s CombinedCounter) Bytes() uint64 {
113 // Name represents string value stored under name vector.
116 func (n Name) String() string {
120 // Stat represents some type of stat which is usually defined by StatType.
121 type Stat interface {
122 // IsZero returns true if all of its values equal to zero.
125 // isStat is intentionally unexported to limit implementations of interface to this package,
129 // ScalarStat represents stat for ScalarIndex.
130 type ScalarStat float64
132 // ErrorStat represents stat for ErrorIndex. The array represents workers.
133 type ErrorStat []Counter
135 // SimpleCounterStat represents stat for SimpleCounterVector.
136 // The outer array represents workers and the inner array represents interface/node/.. indexes.
137 // Values should be aggregated per interface/node for every worker.
138 // ReduceSimpleCounterStatIndex can be used to reduce specific index.
139 type SimpleCounterStat [][]Counter
141 // CombinedCounterStat represents stat for CombinedCounterVector.
142 // The outer array represents workers and the inner array represents interface/node/.. indexes.
143 // Values should be aggregated per interface/node for every worker.
144 // ReduceCombinedCounterStatIndex can be used to reduce specific index.
145 type CombinedCounterStat [][]CombinedCounter
147 // NameStat represents stat for NameVector.
150 // EmptyStat represents removed counter directory
151 type EmptyStat string
153 func (ScalarStat) isStat() {}
154 func (ErrorStat) isStat() {}
155 func (SimpleCounterStat) isStat() {}
156 func (CombinedCounterStat) isStat() {}
157 func (NameStat) isStat() {}
158 func (EmptyStat) isStat() {}
160 func (s ScalarStat) IsZero() bool {
163 func (s ErrorStat) IsZero() bool {
167 for _, ss := range s {
174 func (s SimpleCounterStat) IsZero() bool {
178 for _, ss := range s {
179 for _, sss := range ss {
187 func (s CombinedCounterStat) IsZero() bool {
191 for _, ss := range s {
195 for _, sss := range ss {
196 if sss[0] != 0 || sss[1] != 0 {
203 func (s NameStat) IsZero() bool {
207 for _, ss := range s {
214 func (s EmptyStat) IsZero() bool {
218 // ReduceSimpleCounterStatIndex returns reduced SimpleCounterStat s for index i.
219 func ReduceSimpleCounterStatIndex(s SimpleCounterStat, i int) uint64 {
221 for _, w := range s {
227 // ReduceCombinedCounterStatIndex returns reduced CombinedCounterStat s for index i.
228 func ReduceCombinedCounterStatIndex(s CombinedCounterStat, i int) [2]uint64 {
230 for _, w := range s {
231 val[0] += uint64(w[i][0])
232 val[1] += uint64(w[i][1])