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|
package flags
import (
"flag"
"fmt"
"os"
"regexp"
"slices"
"strings"
"sync"
"sync/atomic"
"time"
)
var (
singleton = Flags{
TUIExportEnable: true,
}
once sync.Once
parseErr error
pidFilter atomic.Int64
tidFilter atomic.Int64
tuiExportEnable atomic.Bool
)
func init() {
pidFilter.Store(-1)
tidFilter.Store(-1)
tuiExportEnable.Store(true)
}
var (
validCollapsedFields = []string{
"path",
"comm",
"tracepoint",
"pid",
"tid",
"flags",
}
validCollapsedCounts = []string{
"count",
"duration",
"durationToPrev",
"bytes",
}
)
type Flags struct {
PidFilter int
TidFilter int
EventMapSize int
CommFilter string
PathFilter string
PprofEnable bool
Duration int
// Tracepints flags
TracepointsToAttach []*regexp.Regexp
TracepointsToExclude []*regexp.Regexp
// Flamegraph flags
PlainMode bool
FlamegraphEnable bool
LiveFlamegraph bool
LiveInterval time.Duration
FlamegraphName string
TUIExportEnable bool
// To convert ior data into native SVG format
IorDataFile string
CollapsedFields []string
CountField string
}
func Get() Flags {
out := singleton
out.PidFilter = int(pidFilter.Load())
out.TidFilter = int(tidFilter.Load())
out.TUIExportEnable = tuiExportEnable.Load()
return out
}
// SetPidFilter updates the active PID filter used for subsequent tracing runs.
func SetPidFilter(pid int) {
pidFilter.Store(int64(pid))
}
// SetTidFilter updates the active TID filter used for subsequent tracing runs.
func SetTidFilter(tid int) {
tidFilter.Store(int64(tid))
}
// SetTUIExportEnable toggles TUI snapshot export file writing.
func SetTUIExportEnable(enabled bool) {
tuiExportEnable.Store(enabled)
}
func Parse() error {
once.Do(func() {
parseErr = parse()
})
return parseErr
}
func parse() error {
flag.IntVar(&singleton.PidFilter, "pid", -1, "Filter for processes ID")
flag.IntVar(&singleton.TidFilter, "tid", -1, "Filter for thread ID")
flag.IntVar(&singleton.EventMapSize, "mapSize", 4096*16, "BPF FD event ring buffer map size")
flag.IntVar(&singleton.Duration, "duration", 60, "Probe duration in seconds")
flag.StringVar(&singleton.CommFilter, "comm", "", "Command to filter for")
flag.StringVar(&singleton.PathFilter, "path", "", "Path to filter for")
flag.BoolVar(&singleton.PprofEnable, "pprof", false, "Enable profiling")
tracepointsToAttach := flag.String("tps", "", "Comma separated list regexes for tracepoints to load")
tracepointsToExclude := flag.String("tpsExclude", "", "Comma separated list regexes for tracepoints to exclude")
flag.BoolVar(&singleton.PlainMode, "plain", false, "Enable plain CSV output mode (disable TUI)")
flag.BoolVar(&singleton.FlamegraphEnable, "flamegraph", false, "Enable flamegraph builder")
flag.BoolVar(&singleton.LiveFlamegraph, "live", false, "Enable live flamegraph mode")
flag.DurationVar(&singleton.LiveInterval, "live-interval", 200*time.Millisecond, "Live flamegraph refresh interval")
flag.StringVar(&singleton.FlamegraphName, "name", "default", "Name of the flamegraph, used to generate the SVG file")
flag.BoolVar(&singleton.TUIExportEnable, "tuiExport", true, "Enable writing TUI snapshot export files")
flag.StringVar(&singleton.IorDataFile, "ior", "", "IOR data file to convert into native SVG flamegraph")
fields := flag.String("fields", "",
fmt.Sprintf("Comma separated list of fields to collapse, valid are: %v", validCollapsedFields))
flag.StringVar(&singleton.CountField, "count", "count",
fmt.Sprintf("Count field to collapse, valid are: %v", validCollapsedCounts))
if err := flag.CommandLine.Parse(os.Args[1:]); err != nil {
return err
}
pidFilter.Store(int64(singleton.PidFilter))
tidFilter.Store(int64(singleton.TidFilter))
tuiExportEnable.Store(singleton.TUIExportEnable)
var err error
singleton.TracepointsToAttach, err = extractTracepointFlags(*tracepointsToAttach)
if err != nil {
return err
}
singleton.TracepointsToExclude, err = extractTracepointFlags(*tracepointsToExclude)
if err != nil {
return err
}
// Keep this list empty by default.
// As of February 23, 2026, open_by_handle_at and name_to_handle_at were
// re-evaluated on newer kernels and do not require CO-RE-based exclusions.
// If future kernels regress, add targeted exclusions here.
if *fields == "" {
singleton.CollapsedFields = []string{"comm", "path", "tracepoint"}
} else {
singleton.CollapsedFields = strings.Split(*fields, ",")
}
for _, field := range singleton.CollapsedFields {
if !slices.Contains(validCollapsedFields, field) {
return fmt.Errorf("invalid field for collapse: %s", field)
}
}
if !slices.Contains(validCollapsedCounts, singleton.CountField) {
return fmt.Errorf("invalid count field: %s", singleton.CountField)
}
return nil
}
func extractTracepointFlags(tracepoints string) (regexes []*regexp.Regexp, err error) {
if len(tracepoints) == 0 {
return regexes, nil
}
for _, name := range strings.Split(tracepoints, ",") {
re, err := regexp.Compile(name)
if err != nil {
return nil, fmt.Errorf("unable to compile regex %q: %w", name, err)
}
regexes = append(regexes, re)
}
return regexes, nil
}
func (flags Flags) ShouldIAttachTracepoint(tracepointName string) bool {
for _, re := range flags.TracepointsToExclude {
if re.MatchString(tracepointName) {
return false
}
}
if len(flags.TracepointsToAttach) == 0 {
return true
}
for _, re := range flags.TracepointsToAttach {
if re.MatchString(tracepointName) {
return true
}
}
return false
}
|
