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wakeup.go
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/
wakeup.go
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package bed
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"os"
"sync"
"time"
"github.com/warthog618/gpiod"
)
type WakeUp struct {
fileName string
chip *gpiod.Chip
dataLock sync.RWMutex
data *Data
}
func NewWakeup(chipName string, fileName string) (*WakeUp, error) {
chip, err := gpiod.NewChip(chipName)
if err != nil {
return nil, fmt.Errorf("error initializing chip: %w", err)
}
var data Data
// read existing data, ignore non-existing file
storeData, err := os.ReadFile(fileName)
if err != nil && !os.IsNotExist(err) {
return nil, fmt.Errorf("error reading file: %v", err)
}
if len(storeData) > 0 {
if err = json.Unmarshal(storeData, &data); err != nil {
return nil, fmt.Errorf("error unmarshalling file: %v", err)
}
}
return &WakeUp{
chip: chip,
data: &data,
fileName: fileName,
}, nil
}
func (b *WakeUp) Run(ctx context.Context) error {
line, err := b.chip.RequestLine(10, gpiod.WithEventHandler(b.HandlePush), gpiod.WithRisingEdge)
if err != nil {
return fmt.Errorf("error creating line watch: %v", err)
}
// wait for context
<-ctx.Done()
if err := line.Close(); err != nil {
return fmt.Errorf("error closing line: %v", err)
}
return nil
}
func (b *WakeUp) Close() error {
return b.chip.Close()
}
func (b *WakeUp) HandlePush(evt gpiod.LineEvent) {
b.dataLock.Lock()
defer b.dataLock.Unlock()
b.data.Entries = append(b.data.Entries, &Entry{
When: time.Now(),
})
marshalled, err := json.Marshal(b.data)
if err != nil {
log.Printf("error marshalling entry: %v", err)
return
}
if err = ioutil.WriteFile(b.fileName, marshalled, os.ModePerm); err != nil {
log.Printf("error writing file: %v", err)
}
}
func (b *WakeUp) Entries() []*Entry {
b.dataLock.RLock()
defer b.dataLock.RUnlock()
return append([]*Entry(nil), b.data.Entries...)
}