1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
|
package flamegraph
import (
"bytes"
"encoding/gob"
"errors"
"fmt"
"iter"
"os"
"strings"
"time"
"ior/internal/event"
"ior/internal/file"
"ior/internal/types"
"github.com/DataDog/zstd" // Go stdlib does not include zstd; third-party dep required
)
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 (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() {
// Close file on error paths; on success it is already closed before rename.
// Capture the close error and join it with retErr so filesystem issues
// (e.g. full disk detected only on close) are not silently discarded.
if retErr != nil {
if closeErr := file.Close(); closeErr != nil {
retErr = errors.Join(retErr, fmt.Errorf("close temp file %s: %w", tmpFilename, closeErr))
}
}
}()
encoder := zstd.NewWriter(file)
gobEncoder := gob.NewEncoder(encoder)
if err := gobEncoder.Encode(iod.records); err != nil {
return fmt.Errorf("encode ior records: %w", err)
}
// Close encoder before file to flush the final zstd frame, then close
// the file to flush OS buffers. Both must complete before rename.
if err := encoder.Close(); err != nil {
return fmt.Errorf("close zstd writer for %s: %w", tmpFilename, err)
}
if err := file.Close(); err != nil {
return fmt.Errorf("close temp file %s: %w", tmpFilename, 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) (retErr error) {
file, err := os.Open(filename)
if err != nil {
return fmt.Errorf("open %s: %w", filename, err)
}
defer func() {
if err := file.Close(); err != nil {
retErr = errors.Join(retErr, fmt.Errorf("close file %s: %w", filename, err))
}
}()
decoder := zstd.NewReader(file)
defer func() {
if err := decoder.Close(); err != nil {
retErr = errors.Join(retErr, fmt.Errorf("close zstd reader for %s: %w", filename, err))
}
}()
var records map[recordKey]Counter
if err := gob.NewDecoder(decoder).Decode(&records); err != nil {
return fmt.Errorf("decode ior records from %s: %w", filename, 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
}
}
}
}
|
