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reports.go
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reports.go
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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package upload
import (
"crypto/rand"
"encoding/binary"
"encoding/json"
"fmt"
"math"
"os"
"path/filepath"
"strings"
"golang.org/x/telemetry"
"golang.org/x/telemetry/internal/configstore"
it "golang.org/x/telemetry/internal/telemetry"
)
// the upload configuration
var (
uploadConfig *telemetry.UploadConfig
configVersion string
)
// reports generates reports from inactive count files
func reports(todo work) error {
if it.Mode() == "off" {
return nil // no reports
}
// lastWeek is needed for that field in reports
lastWeek := latestReport(todo.uploaded)
countFiles := make(map[string][]string) // date->filename
for _, f := range todo.countfiles {
countFiles[expiryDate(f)] = append(countFiles[expiryDate(f)], f)
}
for k, v := range countFiles {
if notNeeded(k, todo) {
// the report already exists. There's another check in createReport.
continue
}
fname, err := createReport(k, v, lastWeek)
if err != nil {
return err
}
// the report has been created, so delete the count files
for _, f := range v {
if err := os.Remove(f); err != nil {
// ignore. if this happens it's maybe a race
// which is mostly handled in createReport.
// Conversely, on Windows, err may be nil and
// the file not deleted if anyone has it open.
}
}
todo.readyfiles = append(todo.readyfiles, fname)
}
return nil
}
// latestReport returns the YYYY-MM-DD of the last report uploaded
// or the empty string if there are no reports.
func latestReport(uploaded map[string]bool) string {
var latest string
for name := range uploaded {
if strings.HasSuffix(name, ".json") {
if name > latest {
latest = name
}
}
}
if latest == "" {
return ""
}
// strip off the .json
return latest[:len(latest)-len(".json")]
}
// notNeeded returns true if the report for date has already been created
func notNeeded(date string, todo work) bool {
if todo.uploaded != nil && todo.uploaded[date+".json"] {
return true
}
// maybe the report is already in todo.readyfiles
for _, f := range todo.readyfiles {
if strings.Contains(f, date) {
return true
}
}
return false
}
// createReports for all the count files for the same date
// it returns the absolute path name of the file containing the report
func createReport(date string, files []string, lastWeek string) (string, error) {
if uploadConfig == nil {
a, v, err := configstore.Download("latest", nil)
if err != nil {
logger.Print(err) // or something (e.g., panic(err))
}
uploadConfig = &a
configVersion = v
}
uploadOK := true
if uploadConfig == nil || it.Mode() == "local" {
uploadOK = false // no config, nothing to upload
}
if tooOld(date) {
uploadOK = false
}
// should we check that all the x.Meta are consistent for GOOS, GOARCH, etc?
report := &telemetry.Report{
Config: configVersion,
X: computeRandom(), // json encodes all the bits
Week: date,
LastWeek: lastWeek,
}
// X is not being used as a probability to decide which counters to upload,
// but it could be.
var succeeded bool
for _, f := range files {
x, err := parse(string(f))
if err != nil {
logger.Printf("unparseable (%v) %s", err, f)
continue
}
prog := findProgReport(x.Meta, report)
for k, v := range x.Count {
if strings.Contains(k, "\n") {
// stack
prog.Stacks[k] += int64(v)
} else {
// counter
prog.Counters[k] += int64(v)
}
succeeded = true
}
}
if !succeeded {
return "", fmt.Errorf("all %d count files were unparseable", len(files))
}
// 1. generate the local report
localContents, err := json.MarshalIndent(report, "", " ")
if err != nil {
return "", fmt.Errorf("failed to marshal report (%v)", err)
}
// check that the report can be read back
// TODO(pjw): remove for production?
var x telemetry.Report
if err := json.Unmarshal(localContents, &x); err != nil {
return "", fmt.Errorf("failed to unmarshal local report (%v)", err)
}
// 2. create the uploadable version
upload := &telemetry.Report{
Week: report.Week,
LastWeek: report.LastWeek,
X: report.X,
Config: report.Config,
}
for _, p := range report.Programs {
// does the uploadConfig want this program?
// if so, copy over the Stacks and Counters
// that the uploadConfig mentions.
if progConfig, found := findUploadProg(p); found {
x := &telemetry.ProgramReport{
Program: p.Program,
Version: p.Version,
GOOS: p.GOOS,
GOARCH: p.GOARCH,
GoVersion: p.GoVersion,
Counters: make(map[string]int64),
Stacks: make(map[string]int64),
}
upload.Programs = append(upload.Programs, x)
// for each Counter found in uploadp, add it to x.Counters
for _, c := range progConfig.Counters {
if v, found := p.Counters[c.Name]; found {
x.Counters[c.Name] = v
}
}
// and the same for Stacks
for _, s := range progConfig.Stacks {
// this can be made more efficient, when it matters
for k, v := range p.Stacks {
before, _, _ := strings.Cut(k, "\n")
if before == s.Name {
x.Stacks[k] = v
}
}
}
}
}
uploadContents, err := json.MarshalIndent(upload, "", " ")
if err != nil {
return "", fmt.Errorf("failed to marshal upload report (%v)", err)
}
localFileName := filepath.Join(it.LocalDir, "local."+date+".json")
uploadFileName := filepath.Join(it.LocalDir, date+".json")
// if either file exists, someone has been here ahead of us
// (there is still a race, but this check shortens the open window)
if _, err := os.Stat(localFileName); err == nil {
return "", fmt.Errorf("report %s already exists", localFileName)
}
if _, err := os.Stat(uploadFileName); err == nil {
return "", fmt.Errorf("local report %s already exists", uploadFileName)
}
// write the uploadable file
var errUpload, errLocal error
if uploadOK {
errUpload = os.WriteFile(uploadFileName, uploadContents, 0644)
}
// save all local reports.
errLocal = os.WriteFile(localFileName, localContents, 0644)
// even though these errors won't occur, what should happen
// if errUpload == nil and it is ok to upload, and errLocal != nil?
if errLocal != nil {
return "", fmt.Errorf("failed to write local file %s (%v)", uploadFileName, errLocal)
}
if errUpload != nil {
return "", fmt.Errorf("failed to write upload file %s (%v)", uploadFileName, errUpload)
}
return uploadFileName, nil
}
// return an existing ProgremReport, or create anew
func findProgReport(meta map[string]string, report *telemetry.Report) *telemetry.ProgramReport {
for _, prog := range report.Programs {
if prog.Program == meta["Program"] && prog.Version == meta["Version"] &&
prog.GoVersion == meta["GoVersion"] && prog.GOOS == meta["GOOS"] &&
prog.GOARCH == meta["GOARCH"] {
return prog
}
}
prog := telemetry.ProgramReport{
Program: meta["Program"],
Version: meta["Version"],
GoVersion: meta["GoVersion"],
GOOS: meta["GOOS"],
GOARCH: meta["GOARCH"],
Counters: make(map[string]int64),
Stacks: make(map[string]int64),
}
report.Programs = append(report.Programs, &prog)
return &prog
}
// turn 8 random bytes into a float64 in [0,1]
func computeRandom() float64 {
for {
b := make([]byte, 8)
_, err := rand.Read(b)
if err != nil {
logger.Fatalf("rand.Read: %v", err)
}
// and turn it into a float64
x := math.Float64frombits(binary.LittleEndian.Uint64(b))
if math.IsNaN(x) || math.IsInf(x, 0) {
continue
}
x = math.Abs(x)
if x < 0x1p-1000 { // avoid underflow patterns
continue
}
frac, _ := math.Frexp(x) // 52 bits of randomness
return frac*2 - 1
}
}
func findUploadProg(p *telemetry.ProgramReport) (*telemetry.ProgramConfig, bool) {
for _, u := range uploadConfig.Programs {
if u.Name != p.Program {
continue
}
if len(u.Versions) == 0 || isIn(p.Version, u.Versions) {
return u, true
}
}
return nil, false
}
func isIn(x string, l []string) bool {
for _, s := range l {
if x == s {
return true
}
}
return false
}