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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Implements methods to filter samples from profiles.
package profile
import "regexp"
// FilterSamplesByName filters the samples in a profile and only keeps
// samples where at least one frame matches focus but none match ignore.
// Returns true is the corresponding regexp matched at least one sample.
func (p *Profile) FilterSamplesByName(focus, ignore, hide *regexp.Regexp) (fm, im, hm bool) {
focusOrIgnore := make(map[uint64]bool)
hidden := make(map[uint64]bool)
for _, l := range p.Location {
if ignore != nil && l.matchesName(ignore) {
im = true
focusOrIgnore[l.ID] = false
} else if focus == nil || l.matchesName(focus) {
fm = true
focusOrIgnore[l.ID] = true
}
if hide != nil && l.matchesName(hide) {
hm = true
l.Line = l.unmatchedLines(hide)
if len(l.Line) == 0 {
hidden[l.ID] = true
}
}
}
s := make([]*Sample, 0, len(p.Sample))
for _, sample := range p.Sample {
if focusedAndNotIgnored(sample.Location, focusOrIgnore) {
if len(hidden) > 0 {
var locs []*Location
for _, loc := range sample.Location {
if !hidden[loc.ID] {
locs = append(locs, loc)
}
}
if len(locs) == 0 {
// Remove sample with no locations (by not adding it to s).
continue
}
sample.Location = locs
}
s = append(s, sample)
}
}
p.Sample = s
return
}
// matchesName reports whether the function name or file in the
// location matches the regular expression.
func (loc *Location) matchesName(re *regexp.Regexp) bool {
for _, ln := range loc.Line {
if fn := ln.Function; fn != nil {
if re.MatchString(fn.Name) {
return true
}
if re.MatchString(fn.Filename) {
return true
}
}
}
return false
}
// unmatchedLines returns the lines in the location that do not match
// the regular expression.
func (loc *Location) unmatchedLines(re *regexp.Regexp) []Line {
var lines []Line
for _, ln := range loc.Line {
if fn := ln.Function; fn != nil {
if re.MatchString(fn.Name) {
continue
}
if re.MatchString(fn.Filename) {
continue
}
}
lines = append(lines, ln)
}
return lines
}
// focusedAndNotIgnored looks up a slice of ids against a map of
// focused/ignored locations. The map only contains locations that are
// explicitly focused or ignored. Returns whether there is at least
// one focused location but no ignored locations.
func focusedAndNotIgnored(locs []*Location, m map[uint64]bool) bool {
var f bool
for _, loc := range locs {
if focus, focusOrIgnore := m[loc.ID]; focusOrIgnore {
if focus {
// Found focused location. Must keep searching in case there
// is an ignored one as well.
f = true
} else {
// Found ignored location. Can return false right away.
return false
}
}
}
return f
}
// TagMatch selects tags for filtering
type TagMatch func(key, val string, nval int64) bool
// FilterSamplesByTag removes all samples from the profile, except
// those that match focus and do not match the ignore regular
// expression.
func (p *Profile) FilterSamplesByTag(focus, ignore TagMatch) (fm, im bool) {
samples := make([]*Sample, 0, len(p.Sample))
for _, s := range p.Sample {
focused, ignored := focusedSample(s, focus, ignore)
fm = fm || focused
im = im || ignored
if focused && !ignored {
samples = append(samples, s)
}
}
p.Sample = samples
return
}
// focusedTag checks a sample against focus and ignore regexps.
// Returns whether the focus/ignore regexps match any tags
func focusedSample(s *Sample, focus, ignore TagMatch) (fm, im bool) {
fm = focus == nil
for key, vals := range s.Label {
for _, val := range vals {
if ignore != nil && ignore(key, val, 0) {
im = true
}
if !fm && focus(key, val, 0) {
fm = true
}
}
}
for key, vals := range s.NumLabel {
for _, val := range vals {
if ignore != nil && ignore(key, "", val) {
im = true
}
if !fm && focus(key, "", val) {
fm = true
}
}
}
return fm, im
}
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