91 lines
1.7 KiB
Go
91 lines
1.7 KiB
Go
package system
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import (
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"context"
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"fmt"
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"sync"
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"sync/atomic"
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"time"
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)
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// Runs a given work function every "d" duration until the provided context is canceled.
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func Every(ctx context.Context, d time.Duration, work func(t time.Time)) {
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ticker := time.NewTicker(d)
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go func() {
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for {
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select {
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case <-ctx.Done():
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ticker.Stop()
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return
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case t := <-ticker.C:
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work(t)
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}
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}
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}()
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}
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func FormatBytes(b int64) string {
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if b < 1024 {
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return fmt.Sprintf("%d B", b)
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}
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div, exp := int64(1024), 0
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for n := b / 1024; n >= 1024; n /= 1024 {
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div *= 1024
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exp++
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}
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return fmt.Sprintf("%.1f %ciB", float64(b)/float64(div), "KMGTPE"[exp])
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}
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type AtomicBool struct {
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flag uint32
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}
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func (ab *AtomicBool) Set(v bool) {
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i := 0
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if v {
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i = 1
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}
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atomic.StoreUint32(&ab.flag, uint32(i))
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}
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func (ab *AtomicBool) Get() bool {
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return atomic.LoadUint32(&ab.flag) == 1
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}
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// AtomicString allows for reading/writing to a given struct field without having to worry
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// about a potential race condition scenario. Under the hood it uses a simple sync.RWMutex
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// to control access to the value.
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type AtomicString struct {
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v string
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mu sync.RWMutex
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}
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func NewAtomicString(v string) AtomicString {
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return AtomicString{v: v}
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}
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// Stores the string value passed atomically.
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func (as *AtomicString) Store(v string) {
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as.mu.Lock()
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as.v = v
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as.mu.Unlock()
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}
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// Loads the string value and returns it.
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func (as *AtomicString) Load() string {
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as.mu.RLock()
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defer as.mu.RUnlock()
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return as.v
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}
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func (as *AtomicString) UnmarshalText(b []byte) error {
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as.Store(string(b))
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return nil
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}
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//goland:noinspection GoVetCopyLock
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func (as AtomicString) MarshalText() ([]byte, error) {
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return []byte(as.Load()), nil
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}
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