52 lines
953 B
Go
52 lines
953 B
Go
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package adapters
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import (
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"bufio"
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"errors"
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"io"
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"regexp"
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"strings"
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"time"
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)
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// wsAddrPattern is a regex used to read the WebSocket address from the node's
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// log
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var wsAddrPattern = regexp.MustCompile(`ws://[\d.:]+`)
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func matchWSAddr(str string) (string, bool) {
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if !strings.Contains(str, "WebSocket endpoint opened") {
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return "", false
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}
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return wsAddrPattern.FindString(str), true
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}
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// findWSAddr scans through reader r, looking for the log entry with
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// WebSocket address information.
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func findWSAddr(r io.Reader, timeout time.Duration) (string, error) {
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ch := make(chan string)
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go func() {
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s := bufio.NewScanner(r)
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for s.Scan() {
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addr, ok := matchWSAddr(s.Text())
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if ok {
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ch <- addr
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}
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}
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close(ch)
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}()
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var wsAddr string
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select {
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case wsAddr = <-ch:
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if wsAddr == "" {
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return "", errors.New("empty result")
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}
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case <-time.After(timeout):
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return "", errors.New("timed out")
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}
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return wsAddr, nil
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}
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