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Golang chrome debug protocol 库推荐

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推荐几个chrome debug protocol 库,直接面向 chrome debug protocol api

Golang chrome debug protocol 库推荐

chromedp 截图示例:

Go: chromedp 截图示例
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package main

import (
    "context"
    "io/ioutil"
    "log"

    "github.com/chromedp/chromedp"
)

func main() {
    // create context
    ctx, cancel := chromedp.NewContext(context.Background())
    defer cancel()

    // run task list
    var buf []byte
    err := chromedp.Run(ctx, screenshot(`https://www.google.com/`, `#main`, &buf))
    if err != nil {
        log.Fatal(err)
    }

    // save the screenshot to disk
    if err = ioutil.WriteFile("screenshot.png", buf, 0644); err != nil {
        log.Fatal(err)
    }
}

func screenshot(urlstr, sel string, res *[]byte) chromedp.Tasks {
    return chromedp.Tasks{
        chromedp.Navigate(urlstr),
        chromedp.WaitVisible(sel, chromedp.ByID),
        chromedp.Screenshot(sel, res, chromedp.NodeVisible, chromedp.ByID),
    }
}

godet 截图等示例:

Go: godet 截图等示例
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package main

import "fmt"
import "time"

import "github.com/raff/godet"

func main() {
    // connect to Chrome instance
    remote, err := godet.Connect("localhost:9222", false)
    if err != nil {
        fmt.Println("cannot connect to Chrome instance:", err)
        return
    }

    // disconnect when done
    defer remote.Close()

    // get browser and protocol version
    version, _ := remote.Version()
    fmt.Println(version)

    // get list of open tabs
    tabs, _ := remote.TabList("")
    fmt.Println(tabs)

    // install some callbacks
    remote.CallbackEvent(godet.EventClosed, func(params godet.Params) {
        fmt.Println("RemoteDebugger connection terminated.")
    })

    remote.CallbackEvent("Network.requestWillBeSent", func(params godet.Params) {
        fmt.Println("requestWillBeSent",
            params["type"],
            params["documentURL"],
            params["request"].(map[string]interface{})["url"])
    })

    remote.CallbackEvent("Network.responseReceived", func(params godet.Params) {
        fmt.Println("responseReceived",
            params["type"],
            params["response"].(map[string]interface{})["url"])
    })

    remote.CallbackEvent("Log.entryAdded", func(params godet.Params) {
        entry := params["entry"].(map[string]interface{})
        fmt.Println("LOG", entry["type"], entry["level"], entry["text"])
    })

    // block loading of most images
    _ = remote.SetBlockedURLs("*.jpg", "*.png", "*.gif")

    // create new tab
    tab, _ := remote.NewTab("https://www.google.com")
    fmt.Println(tab)

    // enable event processing
    remote.RuntimeEvents(true)
    remote.NetworkEvents(true)
    remote.PageEvents(true)
    remote.DOMEvents(true)
    remote.LogEvents(true)

    // navigate in existing tab
    _ = remote.ActivateTab(tabs[0])

    //remote.StartPreciseCoverage(true, true)

    // re-enable events when changing active tab
    remote.AllEvents(true) // enable all events

    _, _ = remote.Navigate("https://www.google.com")

    // evaluate Javascript expression in existing context
    res, _ := remote.EvaluateWrap(`
            console.log("hello from godet!")
            return 42;
        `)
    fmt.Println(res)

    // take a screenshot
    _ = remote.SaveScreenshot("screenshot.png", 0644, 0, true)

    time.Sleep(time.Second)

    // or save page as PDF
    _ = remote.SavePDF("page.pdf", 0644, godet.PortraitMode(), godet.Scale(0.5), godet.Dimensions(6.0, 2.0))

    // if err := remote.SetInputFiles(0, []string{"hello.txt"}); err != nil {
    //     fmt.Println("setInputFiles", err)
    // }

    time.Sleep(5 * time.Second)

    //remote.StopPreciseCoverage()

    r, err := remote.GetPreciseCoverage(true)
    if err != nil {
        fmt.Println("error profiling", err)
    } else {
        fmt.Println(r)
    }

    // Allow downloads
    _ = remote.SetDownloadBehavior(godet.AllowDownload, "/tmp/")
    _, _ = remote.Navigate("http://httpbin.org/response-headers?Content-Type=text/plain;%20charset=UTF-8&Content-Disposition=attachment;%20filename%3d%22test.jnlp%22")

    time.Sleep(time.Second)

    // Block downloads
    _ = remote.SetDownloadBehavior(godet.DenyDownload, "")
    _, _ = remote.Navigate("http://httpbin.org/response-headers?Content-Type=text/plain;%20charset=UTF-8&Content-Disposition=attachment;%20filename%3d%22test.jnlp%22")
}

gcd 截图示例:

Go: gcd 截图示例
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package main

import (
    "encoding/base64"
    "flag"
    "fmt"
    "log"
    "net/url"
    "os"
    "runtime"
    "sync"
    "time"

    "github.com/wirepair/gcd"
    "github.com/wirepair/gcd/gcdapi"
)

const (
    numTabs = 5
)

var debugger *gcd.Gcd
var wg sync.WaitGroup

var path string
var dir string
var port string

func init() {
    switch runtime.GOOS {
    case "windows":
        flag.StringVar(&path, "chrome", "C:\\Program Files (x86)\\Google\\Chrome\\Application\\chrome.exe", "path to chrome")
        flag.StringVar(&dir, "dir", "C:\\temp\\", "user directory")
    case "darwin":
        flag.StringVar(&path, "chrome", "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome", "path to chrome")
        flag.StringVar(&dir, "dir", "/tmp/", "user directory")
    case "linux":
        flag.StringVar(&path, "chrome", "/usr/bin/chromium-browser", "path to chrome")
        flag.StringVar(&dir, "dir", "/tmp/", "user directory")
    }

    flag.StringVar(&port, "port", "9222", "Debugger port")
}

func main() {
    var err error
    urls := []string{"http://www.google.com", "http://www.veracode.com", "http://www.microsoft.com", "http://bbc.co.uk", "http://www.reddit.com/r/golang"}

    flag.Parse()

    debugger = gcd.NewChromeDebugger()
    debugger.StartProcess(path, dir, port)
    defer debugger.ExitProcess()

    targets := make([]*gcd.ChromeTarget, numTabs)

    for i := 0; i < numTabs; i++ {
        wg.Add(1)
        targets[i], err = debugger.NewTab()
        if err != nil {
            log.Fatalf("error getting targets")
        }
        page := targets[i].Page
        page.Enable()
        targets[i].Subscribe("Page.loadEventFired", pageLoaded)
        // navigate
        navigateParams := &gcdapi.PageNavigateParams{Url: urls[i]}
        _, _, _, err := page.NavigateWithParams(navigateParams)
        if err != nil {
            log.Fatalf("error: %s\n", err)
        }
    }
    wg.Wait()
    for i := 0; i < numTabs; i++ {
        takeScreenShot(targets[i])
    }
}

func pageLoaded(target *gcd.ChromeTarget, event []byte) {
    target.Unsubscribe("Page.loadEventFired")
    wg.Done()
}

func takeScreenShot(target *gcd.ChromeTarget) {
    dom := target.DOM
    page := target.Page
    doc, err := dom.GetDocument(-1, true)
    if err != nil {
        fmt.Printf("error getting doc: %s\n", err)
        return
    }

    debugger.ActivateTab(target)
    time.Sleep(1 * time.Second) // give it a sec to paint
    u, urlErr := url.Parse(doc.DocumentURL)
    if urlErr != nil {
        fmt.Printf("error parsing url: %s\n", urlErr)
        return
    }

    fmt.Printf("Taking screen shot of: %s\n", u.Host)
    screenShotParams := &gcdapi.PageCaptureScreenshotParams{Format: "png", FromSurface: true}
    img, errCap := page.CaptureScreenshotWithParams(screenShotParams)
    if errCap != nil {
        fmt.Printf("error getting doc: %s\n", errCap)
        return
    }

    imgBytes, errDecode := base64.StdEncoding.DecodeString(img)
    if errDecode != nil {
        fmt.Printf("error decoding image: %s\n", errDecode)
        return
    }

    f, errFile := os.Create(u.Host + ".png")
    defer f.Close()
    if errFile != nil {
        fmt.Printf("error creating image file: %s\n", errFile)
        return
    }
    f.Write(imgBytes)
    debugger.CloseTab(target)
}

总结

从体验上看,godet 比较简洁。

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