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package flamegraph
import (
"bytes"
"encoding/gob"
"errors"
"fmt"
"iter"
"os"
"strings"
"time"
"ior/internal/event"
"ior/internal/file"
"ior/internal/types"
// Is there a zstd library part of Go 1.25
"github.com/DataDog/zstd"
)
type pathType = string
type traceIdType = types.TraceId
type commType = string
type pidType = uint32
type tidType = uint32
type flagsType = file.Flags
var hostnameFn = os.Hostname
type recordKey struct {
Path pathType
TraceID traceIdType
Comm commType
Pid pidType
Tid tidType
Flags flagsType
}
type iorData struct {
records map[recordKey]Counter
}
func newIorData() iorData {
return iorData{records: make(map[recordKey]Counter)}
}
func newIorDataFromFile(filename string) (iorData, error) {
iod := newIorData()
if err := iod.loadFromFile(filename); err != nil {
return iorData{}, err
}
return iod, nil
}
// LoadFromFile loads an .ior.zst file and returns an iterator over all records.
func LoadFromFile(filename string) (iter.Seq[IterRecord], error) {
iod, err := newIorDataFromFile(filename)
if err != nil {
return nil, fmt.Errorf("load ior data from %s: %w", filename, err)
}
return iod.iter(), nil
}
func cloneString(s string) string {
// Clone the string by creating a new string with the same content
// This is a workaround to avoid using unsafe package
return string([]byte(s))
}
func (iod iorData) addEventPair(ev *event.Pair) {
cnt := Counter{Count: 1, Duration: ev.Duration, DurationToPrev: ev.DurationToPrev, Bytes: ev.Bytes}
iod.add(ev.FileName(), ev.EnterEv.GetTraceId(), strings.TrimSpace(ev.Comm), ev.EnterEv.GetPid(),
ev.EnterEv.GetTid(), ev.Flags(), cnt)
}
func (iod iorData) add(path pathType, traceId traceIdType, comm commType,
pid pidType, tid tidType, flags flagsType, addCnt Counter) {
key := recordKey{
Path: path,
TraceID: traceId,
Comm: comm,
Pid: pid,
Tid: tid,
Flags: flags,
}
cnt, ok := iod.records[key]
if !ok {
iod.records[key] = addCnt
return
}
iod.records[key] = cnt.add(addCnt)
}
func (iod iorData) merge(other iorData) iorData {
for key, cnt := range other.records {
iod.add(key.Path, key.TraceID, key.Comm, key.Pid, key.Tid, key.Flags, cnt)
}
return iod
}
func (iod iorData) serializeToFile(flamegraphName string) (retErr error) {
hostname, err := hostnameFn()
if err != nil {
return fmt.Errorf("get hostname: %w", err)
}
if flamegraphName == "" {
flamegraphName = "default"
}
filename := fmt.Sprintf("%s-%s-%s.ior.zst", hostname, flamegraphName,
time.Now().Format("2006-01-02_15:04:05"))
fmt.Println("Writing", filename)
tmpFilename := fmt.Sprintf("%s.tmp", filename)
file, err := os.Create(tmpFilename)
if err != nil {
return fmt.Errorf("create temp file %s: %w", tmpFilename, err)
}
defer func() {
if err := file.Close(); err != nil {
retErr = errors.Join(retErr, fmt.Errorf("close temp file %s: %w", tmpFilename, err))
}
}()
encoder := zstd.NewWriter(file)
defer func() {
if err := encoder.Close(); err != nil {
retErr = errors.Join(retErr, fmt.Errorf("close zstd writer for %s: %w", tmpFilename, err))
}
}()
gobEncoder := gob.NewEncoder(encoder)
if err := gobEncoder.Encode(iod.records); err != nil {
return fmt.Errorf("encode ior records: %w", err)
}
if err := encoder.Flush(); err != nil {
return fmt.Errorf("flush ior records: %w", err)
}
if err := os.Rename(tmpFilename, filename); err != nil {
return fmt.Errorf("rename %s to %s: %w", tmpFilename, filename, err)
}
return nil
}
func (iod *iorData) loadFromFile(filename string) error {
file, err := os.Open(filename)
if err != nil {
return err
}
defer file.Close()
decoder := zstd.NewReader(file)
defer decoder.Close()
var records map[recordKey]Counter
if err := gob.NewDecoder(decoder).Decode(&records); err != nil {
return err
}
if records == nil {
records = make(map[recordKey]Counter)
}
iod.records = records
return nil
}
func (iod iorData) serialize() ([]byte, error) {
var buf bytes.Buffer
enc := gob.NewEncoder(&buf)
err := enc.Encode(iod.records)
return buf.Bytes(), err
}
func (iod *iorData) deserialize(buf *bytes.Buffer) error {
var records map[recordKey]Counter
if err := gob.NewDecoder(bytes.NewReader(buf.Bytes())).Decode(&records); err != nil {
return err
}
if records == nil {
records = make(map[recordKey]Counter)
}
iod.records = records
return nil
}
// IterRecord is a single record returned by the iterator.
type IterRecord struct {
Path string
TraceID types.TraceId
Comm string
Pid uint32
Tid uint32
Flags file.Flags
Cnt Counter
}
// StringByName returns the string representation of a field by name.
// Returns an error if the field name is not recognized.
func (ir IterRecord) StringByName(name string) (string, error) {
switch name {
case "path":
return strings.Join(strings.Split(ir.Path, "/"), ";/"), nil
case "comm":
return ir.Comm, nil
case "tracepoint":
return ir.TraceID.String(), nil
case "pid":
return fmt.Sprint(ir.Pid), nil
case "tid":
return fmt.Sprint(ir.Tid), nil
case "flags":
return ir.Flags.String(), nil
default:
return "", fmt.Errorf("unknown field %q in record", name)
}
}
func (iod iorData) iter() iter.Seq[IterRecord] {
return func(yield func(IterRecord) bool) {
for key, cnt := range iod.records {
record := IterRecord{
Path: key.Path,
TraceID: key.TraceID,
Comm: key.Comm,
Pid: key.Pid,
Tid: key.Tid,
Flags: key.Flags,
Cnt: cnt,
}
if !yield(record) {
return
}
}
}
}
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