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package main
import (
"fmt"
"os"
"sort"
"strings"
"sync"
"time"
)
type JobWaitGroup struct {
lock sync.RWMutex
jobs map[string]bool
wg sync.WaitGroup
}
func (jwg *JobWaitGroup) Do(name string, fn func()) {
jwg.lock.Lock()
defer jwg.lock.Unlock()
if jwg.jobs == nil {
jwg.jobs = make(map[string]bool)
}
if _, dup := jwg.jobs[name]; dup {
panic(fmt.Sprintf("job %q already exists", name))
}
jwg.jobs[name] = true
jwg.wg.Add(1)
go func() {
defer func() {
jwg.lock.Lock()
defer jwg.lock.Unlock()
jwg.jobs[name] = false
jwg.wg.Done()
}()
fn()
}()
}
func (jwg *JobWaitGroup) Wait() {
jwg.wg.Wait()
}
func (jwg *JobWaitGroup) Status() (int, []string) {
jwg.lock.RLock()
n := len(jwg.jobs)
var jobs []string
for job, active := range jwg.jobs {
if active {
jobs = append(jobs, job)
}
}
defer jwg.lock.RUnlock()
sort.Strings(jobs)
return n, jobs
}
func (jwg *JobWaitGroup) Watch(d time.Duration) {
ticker := time.NewTicker(d)
done := make(chan struct{})
go func() {
jwg.Wait()
ticker.Stop()
done <- struct{}{}
}()
for {
select {
case <-ticker.C:
n, jobs := jwg.Status()
if len(jobs) == 0 {
panic("no active jobs, but wg still waiting")
}
line := fmt.Sprintf("%d/%d : %v", len(jobs), n, strings.Join(jobs, ", "))
if len(line) > 70 {
line = line[:67] + "..."
}
fmt.Fprintf(os.Stderr, "\r%-70s", line)
case <-done:
fmt.Fprintf(os.Stderr, "\r%-70s\n", "done")
return
}
}
}
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