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url_parser.go
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package launcher
import (
"context"
"errors"
"io"
"io/ioutil"
"net/http"
"net/url"
"regexp"
"strings"
"sync"
"github.com/go-rod/rod/lib/utils"
"github.com/ysmood/gson"
)
var _ io.Writer = &URLParser{}
// URLParser to get control url from stderr
type URLParser struct {
URL chan string
Buffer string // buffer for the browser stdout
lock *sync.Mutex
ctx context.Context
done bool
}
// NewURLParser instance
func NewURLParser() *URLParser {
return &URLParser{
URL: make(chan string),
lock: &sync.Mutex{},
ctx: context.Background(),
}
}
var regWS = regexp.MustCompile(`ws://.+/`)
// Context sets the context
func (r *URLParser) Context(ctx context.Context) *URLParser {
r.ctx = ctx
return r
}
// Write interface
func (r *URLParser) Write(p []byte) (n int, err error) {
r.lock.Lock()
defer r.lock.Unlock()
if !r.done {
r.Buffer += string(p)
str := regWS.FindString(r.Buffer)
if str != "" {
u, err := url.Parse(strings.TrimSpace(str))
utils.E(err)
select {
case <-r.ctx.Done():
case r.URL <- "http://" + u.Host:
}
r.done = true
r.Buffer = ""
}
}
return len(p), nil
}
// Err returns the common error parsed from stdout and stderr
func (r *URLParser) Err() error {
r.lock.Lock()
defer r.lock.Unlock()
msg := "[launcher] Failed to get the debug url: "
if strings.Contains(r.Buffer, "error while loading shared libraries") {
msg = "[launcher] Failed to launch the browser, the doc might help https://go-rod.github.io/#/compatibility?id=os: "
}
return errors.New(msg + r.Buffer)
}
// MustResolveURL is similar to ResolveURL
func MustResolveURL(u string) string {
u, err := ResolveURL(u)
utils.E(err)
return u
}
var regPort = regexp.MustCompile(`^\:?(\d+)$`)
var regProtocol = regexp.MustCompile(`^\w+://`)
// ResolveURL by requesting the u, it will try best to normalize the u.
// The format of u can be "9222", ":9222", "host:9222", "ws://host:9222", "wss://host:9222",
// "https://host:9222" "http://host:9222". The return string will look like:
// "ws://host:9222/devtools/browser/4371405f-84df-4ad6-9e0f-eab81f7521cc"
func ResolveURL(u string) (string, error) {
if u == "" {
u = "9222"
}
u = strings.TrimSpace(u)
u = regPort.ReplaceAllString(u, "127.0.0.1:$1")
if !regProtocol.MatchString(u) {
u = "http://" + u
}
parsed, err := url.Parse(u)
if err != nil {
return "", err
}
parsed = toHTTP(*parsed)
parsed.Path = "/json/version"
res, err := http.Get(parsed.String())
if err != nil {
return "", err
}
defer func() { _ = res.Body.Close() }()
data, err := ioutil.ReadAll(res.Body)
utils.E(err)
return gson.New(data).Get("webSocketDebuggerUrl").Str(), nil
}