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//go:build cgo
// +build cgo
package tvmauth
import "C"
import (
"fmt"
"sync"
"a.yandex-team.ru/library/go/core/log"
)
// CGO pointer rules state:
//
// Go code may pass a Go pointer to C provided the Go memory to which it points **does not contain any Go pointers**.
//
// Logger is an interface and contains pointer to implementation. That means, we are forbidden from
// passing Logger to C code.
//
// Instead, we put logger into a global map and pass key to the C code.
//
// This might seem inefficient, but we are not concerned with performance here, since the logger is not on the hot path anyway.
var (
loggersLock sync.Mutex
nextSlot int
loggers = map[int]log.Logger{}
)
func registerLogger(l log.Logger) int {
loggersLock.Lock()
defer loggersLock.Unlock()
i := nextSlot
nextSlot++
loggers[i] = l
return i
}
func unregisterLogger(i int) {
loggersLock.Lock()
defer loggersLock.Unlock()
if _, ok := loggers[i]; !ok {
panic(fmt.Sprintf("attempt to unregister unknown logger %d", i))
}
delete(loggers, i)
}
func findLogger(i int) log.Logger {
loggersLock.Lock()
defer loggersLock.Unlock()
return loggers[i]
}
//export TVM_WriteToLog
//
// TVM_WriteToLog is technical artifact
func TVM_WriteToLog(logger int, level int, msgData *C.char, msgSize C.int) {
l := findLogger(logger)
msg := C.GoStringN(msgData, msgSize)
switch level {
case 3:
l.Error(msg)
case 4:
l.Warn(msg)
case 6:
l.Info(msg)
default:
l.Debug(msg)
}
}
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