1 // Copyright 2016 Google Inc. All Rights Reserved.
2 //
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
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
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.
14 15 package profile
16 17 import (
18 "fmt"
19 "strconv"
20 "strings"
21 )
22 23 // SampleIndexByName returns the appropriate index for a value of sample index.
24 // If numeric, it returns the number, otherwise it looks up the text in the
25 // profile sample types.
26 func (p *Profile) SampleIndexByName(sampleIndex string) (int, error) {
27 if sampleIndex == "" {
28 if dst := p.DefaultSampleType; dst != "" {
29 for i, t := range sampleTypes(p) {
30 if t == dst {
31 return i, nil
32 }
33 }
34 }
35 // By default select the last sample value
36 return len(p.SampleType) - 1, nil
37 }
38 if i, err := strconv.Atoi(sampleIndex); err == nil {
39 if i < 0 || i >= len(p.SampleType) {
40 return 0, fmt.Errorf("sample_index %s is outside the range [0..%d]", sampleIndex, len(p.SampleType)-1)
41 }
42 return i, nil
43 }
44 45 // Remove the inuse_ prefix to support legacy pprof options
46 // "inuse_space" and "inuse_objects" for profiles containing types
47 // "space" and "objects".
48 noInuse := strings.TrimPrefix(sampleIndex, "inuse_")
49 for i, t := range p.SampleType {
50 if t.Type == sampleIndex || t.Type == noInuse {
51 return i, nil
52 }
53 }
54 55 return 0, fmt.Errorf("sample_index %q must be one of: %v", sampleIndex, sampleTypes(p))
56 }
57 58 func sampleTypes(p *Profile) []string {
59 types := make([]string, len(p.SampleType))
60 for i, t := range p.SampleType {
61 types[i] = t.Type
62 }
63 return types
64 }
65