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restic/internal/ui/progress/counter.go

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package progress
import (
"sync"
"time"
)
// A Func is a callback for a Counter.
//
// The final argument is true if Counter.Done has been called,
// which means that the current call will be the last.
type Func func(value uint64, total uint64, runtime time.Duration, final bool)
// A Counter tracks a running count and controls a goroutine that passes its
// value periodically to a Func.
//
// The Func is also called when SIGUSR1 (or SIGINFO, on BSD) is received.
type Counter struct {
Updater
valueMutex sync.Mutex
value uint64
max uint64
}
// NewCounter starts a new Counter.
func NewCounter(interval time.Duration, total uint64, report Func) *Counter {
c := &Counter{
max: total,
}
c.Updater = *NewUpdater(interval, func(runtime time.Duration, final bool) {
v, max := c.Get()
report(v, max, runtime, final)
})
return c
}
// Add v to the Counter. This method is concurrency-safe.
func (c *Counter) Add(v uint64) {
if c == nil {
return
}
c.valueMutex.Lock()
c.value += v
c.valueMutex.Unlock()
}
// SetMax sets the maximum expected counter value. This method is concurrency-safe.
func (c *Counter) SetMax(max uint64) {
if c == nil {
return
}
c.valueMutex.Lock()
c.max = max
c.valueMutex.Unlock()
}
// Get returns the current value and the maximum of c.
// This method is concurrency-safe.
func (c *Counter) Get() (v, max uint64) {
c.valueMutex.Lock()
v, max = c.value, c.max
c.valueMutex.Unlock()
return v, max
}
func (c *Counter) Done() {
if c != nil {
c.Updater.Done()
}
}