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// Copyright 2014 Google Inc. All Rights Reserved.
//
// 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 driver
import (
"fmt"
"regexp"
"strconv"
"strings"
"github.com/google/pprof/internal/measurement"
"github.com/google/pprof/internal/plugin"
"github.com/google/pprof/profile"
)
var tagFilterRangeRx = regexp.MustCompile("([+-]?[[:digit:]]+)([[:alpha:]]+)?")
// applyFocus filters samples based on the focus/ignore options
func applyFocus(prof *profile.Profile, numLabelUnits map[string]string, cfg config, ui plugin.UI) error {
focus, err := compileRegexOption("focus", cfg.Focus, nil)
ignore, err := compileRegexOption("ignore", cfg.Ignore, err)
hide, err := compileRegexOption("hide", cfg.Hide, err)
show, err := compileRegexOption("show", cfg.Show, err)
showfrom, err := compileRegexOption("show_from", cfg.ShowFrom, err)
tagfocus, err := compileTagFilter("tagfocus", cfg.TagFocus, numLabelUnits, ui, err)
tagignore, err := compileTagFilter("tagignore", cfg.TagIgnore, numLabelUnits, ui, err)
prunefrom, err := compileRegexOption("prune_from", cfg.PruneFrom, err)
if err != nil {
return err
}
fm, im, hm, hnm := prof.FilterSamplesByName(focus, ignore, hide, show)
warnNoMatches(focus == nil || fm, "Focus", ui)
warnNoMatches(ignore == nil || im, "Ignore", ui)
warnNoMatches(hide == nil || hm, "Hide", ui)
warnNoMatches(show == nil || hnm, "Show", ui)
sfm := prof.ShowFrom(showfrom)
warnNoMatches(showfrom == nil || sfm, "ShowFrom", ui)
tfm, tim := prof.FilterSamplesByTag(tagfocus, tagignore)
warnNoMatches(tagfocus == nil || tfm, "TagFocus", ui)
warnNoMatches(tagignore == nil || tim, "TagIgnore", ui)
tagshow, err := compileRegexOption("tagshow", cfg.TagShow, err)
taghide, err := compileRegexOption("taghide", cfg.TagHide, err)
tns, tnh := prof.FilterTagsByName(tagshow, taghide)
warnNoMatches(tagshow == nil || tns, "TagShow", ui)
warnNoMatches(taghide == nil || tnh, "TagHide", ui)
if prunefrom != nil {
prof.PruneFrom(prunefrom)
}
return err
}
func compileRegexOption(name, value string, err error) (*regexp.Regexp, error) {
if value == "" || err != nil {
return nil, err
}
rx, err := regexp.Compile(value)
if err != nil {
return nil, fmt.Errorf("parsing %s regexp: %v", name, err)
}
return rx, nil
}
func compileTagFilter(name, value string, numLabelUnits map[string]string, ui plugin.UI, err error) (func(*profile.Sample) bool, error) {
if value == "" || err != nil {
return nil, err
}
tagValuePair := strings.SplitN(value, "=", 2)
var wantKey string
if len(tagValuePair) == 2 {
wantKey = tagValuePair[0]
value = tagValuePair[1]
}
if numFilter := parseTagFilterRange(value); numFilter != nil {
ui.PrintErr(name, ":Interpreted '", value, "' as range, not regexp")
labelFilter := func(vals []int64, unit string) bool {
for _, val := range vals {
if numFilter(val, unit) {
return true
}
}
return false
}
numLabelUnit := func(key string) string {
return numLabelUnits[key]
}
if wantKey == "" {
return func(s *profile.Sample) bool {
for key, vals := range s.NumLabel {
if labelFilter(vals, numLabelUnit(key)) {
return true
}
}
return false
}, nil
}
return func(s *profile.Sample) bool {
if vals, ok := s.NumLabel[wantKey]; ok {
return labelFilter(vals, numLabelUnit(wantKey))
}
return false
}, nil
}
var rfx []*regexp.Regexp
for _, tagf := range strings.Split(value, ",") {
fx, err := regexp.Compile(tagf)
if err != nil {
return nil, fmt.Errorf("parsing %s regexp: %v", name, err)
}
rfx = append(rfx, fx)
}
if wantKey == "" {
return func(s *profile.Sample) bool {
matchedrx:
for _, rx := range rfx {
for key, vals := range s.Label {
for _, val := range vals {
// TODO: Match against val, not key:val in future
if rx.MatchString(key + ":" + val) {
continue matchedrx
}
}
}
return false
}
return true
}, nil
}
return func(s *profile.Sample) bool {
if vals, ok := s.Label[wantKey]; ok {
for _, rx := range rfx {
for _, val := range vals {
if rx.MatchString(val) {
return true
}
}
}
}
return false
}, nil
}
// parseTagFilterRange returns a function to checks if a value is
// contained on the range described by a string. It can recognize
// strings of the form:
// "32kb" -- matches values == 32kb
// ":64kb" -- matches values <= 64kb
// "4mb:" -- matches values >= 4mb
// "12kb:64mb" -- matches values between 12kb and 64mb (both included).
func parseTagFilterRange(filter string) func(int64, string) bool {
ranges := tagFilterRangeRx.FindAllStringSubmatch(filter, 2)
if len(ranges) == 0 {
return nil // No ranges were identified
}
v, err := strconv.ParseInt(ranges[0][1], 10, 64)
if err != nil {
panic(fmt.Errorf("failed to parse int %s: %v", ranges[0][1], err))
}
scaledValue, unit := measurement.Scale(v, ranges[0][2], ranges[0][2])
if len(ranges) == 1 {
switch match := ranges[0][0]; filter {
case match:
return func(v int64, u string) bool {
sv, su := measurement.Scale(v, u, unit)
return su == unit && sv == scaledValue
}
case match + ":":
return func(v int64, u string) bool {
sv, su := measurement.Scale(v, u, unit)
return su == unit && sv >= scaledValue
}
case ":" + match:
return func(v int64, u string) bool {
sv, su := measurement.Scale(v, u, unit)
return su == unit && sv <= scaledValue
}
}
return nil
}
if filter != ranges[0][0]+":"+ranges[1][0] {
return nil
}
if v, err = strconv.ParseInt(ranges[1][1], 10, 64); err != nil {
panic(fmt.Errorf("failed to parse int %s: %v", ranges[1][1], err))
}
scaledValue2, unit2 := measurement.Scale(v, ranges[1][2], unit)
if unit != unit2 {
return nil
}
return func(v int64, u string) bool {
sv, su := measurement.Scale(v, u, unit)
return su == unit && sv >= scaledValue && sv <= scaledValue2
}
}
func warnNoMatches(match bool, option string, ui plugin.UI) {
if !match {
ui.PrintErr(option + " expression matched no samples")
}
}
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