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golib.go
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golib.go
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package golib
import (
"fmt"
"io"
"net/http"
"sync"
"time"
)
var (
tagMtx sync.Mutex
tag string
timeChan = make(chan string)
strChan = make(chan string)
)
func GetURL(url string) (string, error) {
time.Sleep(time.Second * 3)
//nolint:noctx
res, err := http.Get(url)
if err != nil {
return "", err
}
defer res.Body.Close()
resData, err := io.ReadAll(res.Body)
if err != nil {
return "", err
}
return string(resData), nil
}
func Hello() {
fmt.Println("Hello!")
}
func SetTag(newt string) {
tagMtx.Lock()
tag = newt
tagMtx.Unlock()
}
// produceTime writes into timeChan
func produceTime() {
for {
tagMtx.Lock()
t := tag
tagMtx.Unlock()
s := fmt.Sprintf("%s - %s", t,
time.Now().Format("2006-01-02 15:04:05.000 MST -0700"))
timeChan <- s
}
}
// NextTime reads from timeChan (blocks).
func NextTime() string {
nt := <-timeChan
return nt
}
func WriteStr(s string) {
tagMtx.Lock()
t := tag
tagMtx.Unlock()
strChan <- t + " " + s
}
func ReadStr() string {
return <-strChan
}
type ReadLoopCB interface {
F(string)
}
func ReadLoop(cb ReadLoopCB) {
go func() {
for {
cb.F(<-strChan)
}
}()
}
func init() {
go produceTime()
}