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pooler.go
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pooler.go
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package gui
import (
"fmt"
"time"
"github.com/ebfe/scard"
"github.com/ubavic/bas-celik/card"
)
func pooler() {
loaded := false
breakCardLoop := false
selectedReader := ""
selectedReaderIndex := 0
var readersNames []string
setStartPage("Konekcija sa čitačem...", "", nil)
for {
breakCardLoop = false
ctx, err := scard.EstablishContext()
if err != nil {
loaded = false
setStartPage(
"Greška pri upotrebi drajvera za pametne kartice",
"Da li program ima neophodne dozvole?",
fmt.Errorf("establishing context: %w", err))
time.Sleep(1000 * time.Millisecond)
continue
}
readersNames, err = ctx.ListReaders()
if err != nil {
loaded = false
setStartPage(
"Greška pri pretrazi dostupnih čitača",
"Da li je čitač povezan za računar?",
fmt.Errorf("listing readers: %w", err))
goto RELEASE
} else if len(readersNames) == 0 {
loaded = false
setStartPage(
"Nijedan čitač nije detektovan",
"Da li je čitač povezan za računar?",
fmt.Errorf("no reader found"))
goto RELEASE
}
state.mu.Lock()
selectedReader = state.toolbar.GetReaderName()
selectedReaderIndex = indexOf(selectedReader, readersNames)
if selectedReaderIndex < 0 {
selectedReaderIndex = 0
}
state.toolbar.SetReaders(readersNames)
state.mu.Unlock()
for !breakCardLoop {
sCard, err := ctx.Connect(readersNames[selectedReaderIndex], scard.ShareShared, scard.ProtocolAny)
if err == nil {
if !loaded {
setStartPage("Čitam sa kartice...", "", nil)
doc, err := card.ReadCard(sCard)
if err != nil {
setStartPage(
"Greška pri čitanju kartice",
"",
fmt.Errorf("reading from card: %w", err))
} else {
setStatus("Dokument uspešno pročitan", nil)
setUI(doc)
loaded = true
}
}
_ = sCard.Disconnect(scard.LeaveCard)
} else {
loaded = false
setStartPage(
"Greška pri čitanju kartice",
"Da li je kartica prisutna?",
fmt.Errorf("connecting reader %s: %w", readersNames[selectedReaderIndex], err))
}
state.mu.Lock()
breakCardLoop = state.toolbar.ReaderChanged()
state.mu.Unlock()
if !breakCardLoop {
time.Sleep(500 * time.Millisecond)
}
}
setStartPage(
"Povezivanje se čitačem u toku...",
"",
nil)
RELEASE:
_ = ctx.Release()
time.Sleep(1000 * time.Millisecond)
}
}
func indexOf(element string, elements []string) int {
for k, v := range elements {
if element == v {
return k
}
}
return -1
}