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main.go
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main.go
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package main
import (
"errors"
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
"regexp"
"runtime"
"strconv"
"sync"
)
const (
exercismAddr = "https://exercism.io"
trackLang = "go"
)
var commands = map[string]func(tq chan<- task, args []string) error{
"total": totalCmd,
"download": downloadCmd,
"bench": benchCmd,
"clean": cleanCmd,
}
var (
exercise = ""
downloadDirFlag = "./solutions"
concurrencyFlag = false
maxProcsFlag = runtime.GOMAXPROCS(0)
)
var (
solutionPathRE = regexp.MustCompile("solutions/(([[:xdigit:]][[:xdigit:]]){16})")
solutionGroupsNumberRE = regexp.MustCompile(`solutions\?page=([[:digit:]]+)">Last`)
)
var errInvalidUsage = errors.New("invalid usage")
var mlog = log.New(os.Stderr, "", 0)
func main() {
flag.Usage = func() {
fmt.Fprintf(flag.CommandLine.Output(), `Usage: %s [flag...] <exercise-name> <command>
Commands:
total
calculate number of published solutions
download
download published solutions
bench
bench downloaded solutions
clean
remove downloaded solutions
Flags:
`, filepath.Base(os.Args[0]))
flag.PrintDefaults()
}
flag.StringVar(&downloadDirFlag, "d", downloadDirFlag, "directory to store solutions")
flag.BoolVar(&concurrencyFlag, "c", concurrencyFlag, "enable concurrency")
flag.IntVar(&maxProcsFlag, "mp", maxProcsFlag, "GOMAXPROCS value to set")
flag.Parse()
if err := run(flag.Args()); err != nil {
if err == errInvalidUsage {
flag.Usage()
os.Exit(2)
}
mlog.Printf("run error: %v", err)
os.Exit(1)
}
}
func run(args []string) (err error) {
// check args
if len(args) < 2 {
return errInvalidUsage
}
exercise = args[0]
cmd, ok := commands[args[1]]
if !ok {
return errInvalidUsage
}
// determine task queue size
tqSize := 1
runtime.GOMAXPROCS(maxProcsFlag)
if concurrencyFlag {
tqSize = runtime.GOMAXPROCS(0)
}
// create task queue and pool of general purpose workers
tq := make(chan task, tqSize)
defer close(tq)
for i := 0; i < tqSize; i++ {
go worker(tq)
}
// run a given command
return cmd(tq, args[2:])
}
type task func()
func worker(wq <-chan task) {
for {
t, ok := <-wq
if !ok {
return
}
t()
}
}
func totalCmd(tq chan<- task, args []string) error {
if len(args) != 0 {
return errInvalidUsage
}
uuids, err := getSolutionUUIDs(tq)
if err != nil {
return err
}
mlog.Printf("solutions total: %d", len(uuids))
return nil
}
func benchCmd(tq chan<- task, args []string) error {
if len(args) != 0 {
return errInvalidUsage
}
// get benchmark names
bnames, err := getBenchNames(solutionsDir("test-suite"))
if err != nil {
return err
}
if len(bnames) == 0 {
return errors.New("found 0 benchmarks")
}
mlog.Printf("found %d benchmarks:", len(bnames))
for _, n := range bnames {
mlog.Printf("- %s", n)
}
mlog.Println()
// get solutions total
fis, err := ioutil.ReadDir(solutionsDir())
if err != nil {
return err
}
// TODO: replace with a precise count of solutions?
// by default all files except test suite dir are considered as a solution code
total := len(fis) - 1
if total <= 0 {
return errors.New("found 0 solutions")
}
mlog.Printf("solutions total: %d", total)
mlog.Println()
wg := sync.WaitGroup{}
sstats := []*solutionStats{}
mx := sync.Mutex{}
// run all benches in test suite for all solutions
for _, fi := range fis {
if !regular(fi) {
continue
}
// enqueue bench task
wg.Add(1)
fname := fi.Name()
tq <- func() {
defer wg.Done()
// create temp dir
tmp, err := ioutil.TempDir("", "")
if err != nil {
mlog.Printf("temp dir create error: %v", err)
return
}
defer os.RemoveAll(tmp)
// copy all required files to temp dir
dpath := filepath.Join(tmp, fname)
if err = copyFile(solutionsDir(fname), dpath); err != nil {
mlog.Printf("copy file error: %v", err)
return
}
if err = copyFiles(solutionsDir("test-suite"), tmp); err != nil {
mlog.Printf("copy test suite files error: %v", err)
return
}
// run bench
bstats, err := runBench(tmp, ".")
if err != nil {
mlog.Printf("bench of %s failed: %v", fname, err)
return
}
// prepare stats
size, err := getCodeSize(dpath)
if err != nil {
mlog.Printf("bench of %s failed: %v", fname, err)
return
}
st := &solutionStats{
name: fname,
bstats: bstats,
size: size,
}
mx.Lock()
sstats = append(sstats, st)
count := len(sstats)
mx.Unlock()
// report progress
mlog.Printf("benched %-64s: %5d / %5d - %5.1f%%",
st.name, count, total, float32(count)/float32(total)*100)
}
}
// wait all tasks
wg.Wait()
// print stats in sorted way
mlog.Println()
for _, bn := range bnames {
mlog.Printf("------------------------------ %s ------------------------------", bn)
mlog.Println()
sortSolutionStatsByBench(sstats, bn)
for i, st := range sstats {
mlog.Printf("[%5d] %-64s: %s %15d symbols",
i+1, st.name, st.bstats[bn], st.size)
}
mlog.Println()
}
return nil
}
func downloadCmd(tq chan<- task, args []string) error {
if len(args) != 0 {
return errInvalidUsage
}
// get all paths
uuids, err := getSolutionUUIDs(tq)
if err != nil {
return err
}
mlog.Printf("solutions total: %d", len(uuids))
mlog.Println()
// download each solution
count := 0
mx := sync.Mutex{}
if err = getSolutionCodes(tq, uuids, func(uuid, author string) {
mx.Lock()
count++
c := count
mx.Unlock()
mlog.Printf("downloaded %s of %-32s: %5d / %5d - %5.1f%%",
uuid, author, c, len(uuids), float32(c)/float32(len(uuids))*100)
}); err != nil {
return err
}
return nil
}
func cleanCmd(_ chan<- task, args []string) error {
if len(args) != 0 {
return errInvalidUsage
}
cp := solutionsDir()
if err := os.RemoveAll(cp); err != nil {
return err
}
mlog.Printf("%s removed", cp)
return nil
}
func solutionsDir(path ...string) string {
return filepath.Join(append([]string{downloadDirFlag, trackLang, exercise}, path...)...)
}
type uuidMap map[string]struct{}
func getSolutionUUIDs(tq chan<- task) (uuids uuidMap, err error) {
// get first solutions group page
firstGroupPage, solutionsURL, err := getSolutionPage("", nil)
if err != nil {
err = fmt.Errorf("download of %s failed: %v", solutionsURL, err)
return
}
// get total of solutions pages
ms := solutionGroupsNumberRE.FindStringSubmatch(firstGroupPage)
if ms == nil {
err = errors.New("can't find solution groups number")
return
}
total, err := strconv.ParseUint(ms[1], 10, 64)
if err != nil {
return
}
// schedule downloads
wg := sync.WaitGroup{}
mx := sync.Mutex{}
uuids = make(uuidMap)
for i := uint64(0); i < total; i++ {
n := i
wg.Add(1)
tq <- func() {
defer wg.Done()
// get solution group page
groupPage, groupURL, err := getSolutionPage("", map[string]string{
"page": strconv.FormatUint(n+1, 10),
})
if err != nil {
mlog.Printf("download of %s failed: %v", groupURL, err)
return
}
// get solution UUIDs
mss := solutionPathRE.FindAllStringSubmatch(groupPage, -1)
if mss == nil {
mlog.Printf("can't find solution UUIDs in %s", groupURL)
return
}
for _, ms := range mss {
// ignore duplicates if they appear
mx.Lock()
uuids[ms[1]] = struct{}{}
mx.Unlock()
}
}
}
// wait all tasks
wg.Wait()
return uuids, nil
}
func getSolutionCodes(tq chan<- task, uuids uuidMap, got func(uuid, author string)) error {
if err := os.MkdirAll(solutionsDir(), 0700); err != nil {
return err
}
// get test suite
for uuid := range uuids {
solutionPage, solutionURL, err := getSolutionPage(uuid, nil)
if err != nil {
mlog.Printf("download of test suite %s failed: %v", solutionURL, err)
return err
}
// store test suite
ts, err := extractTestSuite(solutionPage)
if err != nil {
return err
}
tsp := solutionsDir("test-suite")
_ = os.Mkdir(tsp, 0700)
for fn, fc := range ts {
fp := filepath.Join(tsp, fn)
if err := ioutil.WriteFile(fp, []byte(fc), 0600); err != nil {
mlog.Printf("write of test file %s failed: %v", fp, err)
}
}
break
}
// schedule downloads and stores
wg := sync.WaitGroup{}
for k := range uuids {
uuid := k
wg.Add(1)
tq <- func() {
defer wg.Done()
// get solution page
solutionPage, solutionURL, err := getSolutionPage(uuid, nil)
if err != nil {
mlog.Printf("download of %s failed: %v", solutionURL, err)
return
}
// extract solution code
code, author, err := extractSolutionCode(solutionPage)
if err != nil {
mlog.Printf("code extraction for %s failed: %v", solutionURL, err)
return
}
// store solution code
fp := solutionsDir(uuid + "-" + author + ".go")
if err := ioutil.WriteFile(fp, []byte(code), 0600); err != nil {
mlog.Printf("write of %s failed: %v", fp, err)
}
got(uuid, author)
}
}
// wait all tasks
wg.Wait()
return nil
}