44 lines
820 B
Go
44 lines
820 B
Go
package dnsforward
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import (
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"fmt"
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"net"
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"os"
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"path"
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"runtime"
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"strings"
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)
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func isConnClosed(err error) bool {
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if err == nil {
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return false
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}
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nerr, ok := err.(*net.OpError)
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if !ok {
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return false
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}
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if strings.Contains(nerr.Err.Error(), "use of closed network connection") {
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return true
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}
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return false
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}
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// ---------------------
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// debug logging helpers
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// ---------------------
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func trace(format string, args ...interface{}) {
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pc := make([]uintptr, 10) // at least 1 entry needed
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runtime.Callers(2, pc)
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f := runtime.FuncForPC(pc[0])
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var buf strings.Builder
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buf.WriteString(fmt.Sprintf("%s(): ", path.Base(f.Name())))
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text := fmt.Sprintf(format, args...)
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buf.WriteString(text)
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if len(text) == 0 || text[len(text)-1] != '\n' {
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buf.WriteRune('\n')
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}
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fmt.Fprint(os.Stderr, buf.String())
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}
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