/
detector.go
175 lines (146 loc) · 5.25 KB
/
detector.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2016-present Datadog, Inc.
// Package languagedetection determines the language that a process is written or compiled in.
package languagedetection
import (
"regexp"
"runtime"
"strings"
"time"
"github.com/DataDog/datadog-agent/pkg/config"
"github.com/DataDog/datadog-agent/pkg/languagedetection/internal/detectors"
"github.com/DataDog/datadog-agent/pkg/languagedetection/languagemodels"
"github.com/DataDog/datadog-agent/pkg/process/net"
"github.com/DataDog/datadog-agent/pkg/telemetry"
"github.com/DataDog/datadog-agent/pkg/util/log"
)
var cliDetectors = []languagemodels.Detector{
detectors.JRubyDetector{},
}
type languageFromCLI struct {
name languagemodels.LanguageName
validator func(exe string) bool
}
// rubyPattern is a regexp validator for the ruby prefix
var rubyPattern = regexp.MustCompile(`^ruby\d+\.\d+$`)
// knownPrefixes maps languages names to their prefix
var knownPrefixes = map[string]languageFromCLI{
"python": {name: languagemodels.Python},
"java": {name: languagemodels.Java, validator: func(exe string) bool {
return exe != "javac"
}},
"ruby": {name: languagemodels.Ruby, validator: func(exe string) bool {
return rubyPattern.MatchString(exe)
}},
}
// exactMatches maps an exact exe name match to a prefix
var exactMatches = map[string]languageFromCLI{
"py": {name: languagemodels.Python},
"python": {name: languagemodels.Python},
"java": {name: languagemodels.Java},
"npm": {name: languagemodels.Node},
"node": {name: languagemodels.Node},
"dotnet": {name: languagemodels.Dotnet},
"ruby": {name: languagemodels.Ruby},
"rubyw": {name: languagemodels.Ruby},
}
// languageNameFromCmdline returns a process's language from its command.
// If the language is not detected, languagemodels.Unknown is returned.
func languageNameFromCommand(command string) languagemodels.LanguageName {
// First check to see if there is an exact match
if lang, ok := exactMatches[command]; ok {
return lang.name
}
for prefix, language := range knownPrefixes {
if strings.HasPrefix(command, prefix) {
if language.validator != nil {
isValidResult := language.validator(command)
if !isValidResult {
continue
}
}
return language.name
}
}
return languagemodels.Unknown
}
const subsystem = "language_detection"
var (
detectLanguageRuntimeMs = telemetry.NewHistogram(subsystem, "detect_language_ms", nil,
"The amount of time it took for the call to DetectLanguage to complete.", nil)
systemProbeLanguageDetectionMs = telemetry.NewHistogram(subsystem, "system_probe_rpc_ms", nil,
"The amount of time it took for the process agent to message the system probe.", nil)
)
// DetectLanguage uses a combination of commandline parsing and binary analysis to detect a process' language
func DetectLanguage(procs []languagemodels.Process, sysprobeConfig config.Reader) []*languagemodels.Language {
detectLanguageStart := time.Now()
defer func() {
detectLanguageRuntimeMs.Observe(float64(time.Since(detectLanguageStart).Milliseconds()))
}()
langs := make([]*languagemodels.Language, len(procs))
unknownPids := make([]int32, 0, len(procs))
langsToModify := make(map[int32]*languagemodels.Language, len(procs))
for i, proc := range procs {
// Language-specific detectors should precede matches on the command/exe
for _, detector := range cliDetectors {
lang, err := detector.DetectLanguage(proc)
if err != nil {
log.Warnf("unable to detect language for process %d: %s", proc.GetPid(), err)
continue
}
if lang.Name != languagemodels.Unknown {
langs[i] = &lang
break
}
}
if langs[i] != nil {
continue
}
exe := getExe(proc.GetCmdline())
languageName := languageNameFromCommand(exe)
if languageName == languagemodels.Unknown {
languageName = languageNameFromCommand(proc.GetCommand())
}
lang := &languagemodels.Language{Name: languageName}
langs[i] = lang
if lang.Name == languagemodels.Unknown {
unknownPids = append(unknownPids, proc.GetPid())
langsToModify[proc.GetPid()] = lang
}
}
if privilegedLanguageDetectionEnabled(sysprobeConfig) {
rpcStart := time.Now()
defer func() {
systemProbeLanguageDetectionMs.Observe(float64(time.Since(rpcStart).Milliseconds()))
}()
log.Trace("[language detection] Requesting language from system probe")
util, err := net.GetRemoteSystemProbeUtil(
sysprobeConfig.GetString("system_probe_config.sysprobe_socket"),
)
if err != nil {
log.Warn("[language detection] Failed to request language:", err)
return langs
}
privilegedLangs, err := util.DetectLanguage(unknownPids)
if err != nil {
log.Warn("[language detection] Failed to request language:", err)
return langs
}
for i, pid := range unknownPids {
*langsToModify[pid] = privilegedLangs[i]
}
}
return langs
}
func privilegedLanguageDetectionEnabled(sysProbeConfig config.Reader) bool {
if sysProbeConfig == nil {
return false
}
// System probe language detection only works on linux operating systems for the moment.
if runtime.GOOS != "linux" {
return false
}
return sysProbeConfig.GetBool("system_probe_config.language_detection.enabled")
}