57 lines
1.6 KiB
Go
57 lines
1.6 KiB
Go
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package netxlite
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import (
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"context"
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"errors"
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)
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// getaddrinfoLookupHost performs a DNS lookup and returns the
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// results. If we were compiled with CGO_ENABLED=0, then this
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// function calls net.DefaultResolver.LookupHost. Otherwise,
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// we call getaddrinfo. In such a case, if getaddrinfo returns a nonzero
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// return value, we'll return as error an instance of the
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// ErrGetaddrinfo error. This error will contain the specific
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// code returned by getaddrinfo in its .Code field.
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func getaddrinfoLookupHost(ctx context.Context, domain string) ([]string, error) {
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addrs, _, err := getaddrinfoLookupANY(ctx, domain)
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return addrs, err
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}
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// ErrGetaddrinfo represents a getaddrinfo failure.
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type ErrGetaddrinfo struct {
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// Err is the error proper.
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Underlying error
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// Code is getaddrinfo's return code.
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Code int64
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}
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// newErrGetaddrinfo creates a new instance of the ErrGetaddrinfo type.
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func newErrGetaddrinfo(code int64, err error) *ErrGetaddrinfo {
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return &ErrGetaddrinfo{
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Underlying: err,
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Code: code,
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}
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}
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// Error returns the underlying error's string.
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func (err *ErrGetaddrinfo) Error() string {
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return err.Underlying.Error()
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}
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// Unwrap allows to get the underlying error value.
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func (err *ErrGetaddrinfo) Unwrap() error {
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return err.Underlying
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}
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// ErrorToGetaddrinfoRetval converts an arbitrary error to
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// the return value of getaddrinfo. If err is nil or is not
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// an instance of ErrGetaddrinfo, we just return zero.
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func ErrorToGetaddrinfoRetval(err error) int64 {
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var aierr *ErrGetaddrinfo
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if err != nil && errors.As(err, &aierr) {
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return aierr.Code
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}
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return 0
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}
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