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
65 func (d StatType) String() string {
69 case SimpleCounterVector:
70 return "SimpleCounterVector"
71 case CombinedCounterVector:
72 return "CombinedCounterVector"
78 return fmt.Sprintf("UnknownStatType(%d)", d)
81 // StatDir defines directory of stats entries created by PrepareDir.
88 // StatEntry represents single stat entry. The type of stat stored in Data
89 // is defined by Type.
90 type StatEntry struct {
96 // Counter represents simple counter with single value, which is usually packet count.
99 // CombinedCounter represents counter with two values, for packet count and bytes count.
100 type CombinedCounter [2]uint64
102 func (s CombinedCounter) Packets() uint64 {
106 func (s CombinedCounter) Bytes() uint64 {
110 // Name represents string value stored under name vector.
113 func (n Name) String() string {
117 // Stat represents some type of stat which is usually defined by StatType.
118 type Stat interface {
119 // IsZero returns true if all of its values equal to zero.
122 // isStat is intentionally unexported to limit implementations of interface to this package,
126 // ScalarStat represents stat for ScalarIndex.
127 type ScalarStat float64
129 // ErrorStat represents stat for ErrorIndex. The array represents workers.
130 type ErrorStat []Counter
132 // SimpleCounterStat represents stat for SimpleCounterVector.
133 // The outer array represents workers and the inner array represents interface/node/.. indexes.
134 // Values should be aggregated per interface/node for every worker.
135 // ReduceSimpleCounterStatIndex can be used to reduce specific index.
136 type SimpleCounterStat [][]Counter
138 // CombinedCounterStat represents stat for CombinedCounterVector.
139 // The outer array represents workers and the inner array represents interface/node/.. indexes.
140 // Values should be aggregated per interface/node for every worker.
141 // ReduceCombinedCounterStatIndex can be used to reduce specific index.
142 type CombinedCounterStat [][]CombinedCounter
144 // NameStat represents stat for NameVector.
147 func (ScalarStat) isStat() {}
148 func (ErrorStat) isStat() {}
149 func (SimpleCounterStat) isStat() {}
150 func (CombinedCounterStat) isStat() {}
151 func (NameStat) isStat() {}
153 func (s ScalarStat) IsZero() bool {
156 func (s ErrorStat) IsZero() bool {
160 for _, ss := range s {
167 func (s SimpleCounterStat) IsZero() bool {
171 for _, ss := range s {
172 for _, sss := range ss {
180 func (s CombinedCounterStat) IsZero() bool {
184 for _, ss := range s {
188 for _, sss := range ss {
189 if sss[0] != 0 || sss[1] != 0 {
196 func (s NameStat) IsZero() bool {
200 for _, ss := range s {
208 // ReduceSimpleCounterStatIndex returns reduced SimpleCounterStat s for index i.
209 func ReduceSimpleCounterStatIndex(s SimpleCounterStat, i int) uint64 {
211 for _, w := range s {
217 // ReduceCombinedCounterStatIndex returns reduced CombinedCounterStat s for index i.
218 func ReduceCombinedCounterStatIndex(s CombinedCounterStat, i int) [2]uint64 {
220 for _, w := range s {
221 val[0] += uint64(w[i][0])
222 val[1] += uint64(w[i][1])