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cdp.go
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cdp.go
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package runn
import (
"context"
"errors"
"fmt"
"os"
"path/filepath"
"reflect"
"strings"
"time"
"github.com/chromedp/chromedp"
)
const cdpNewKey = "new"
const (
cdpTimeoutByStep = 30 * time.Second
cdpWindowWidth = 1920
cdpWindowHeight = 1080
)
type cdpRunner struct {
name string
ctx context.Context
cancel context.CancelFunc
store map[string]interface{}
operator *operator
}
type CDPActions []CDPAction
type CDPAction struct {
Fn string
Args map[string]interface{}
}
func newCDPRunner(name, remote string) (*cdpRunner, error) {
if remote != cdpNewKey {
return nil, errors.New("remote connect mode is planned, but not yet implemented")
}
opts := append(chromedp.DefaultExecAllocatorOptions[:],
chromedp.WindowSize(cdpWindowWidth, cdpWindowHeight),
)
if os.Getenv("RUNN_DISABLE_HEADLESS") != "" {
opts = append(opts,
chromedp.Flag("headless", false),
chromedp.Flag("hide-scrollbars", false),
chromedp.Flag("mute-audio", false),
)
}
allocCtx, cancel := chromedp.NewExecAllocator(context.Background(), opts...)
ctx, _ := chromedp.NewContext(allocCtx)
return &cdpRunner{
name: name,
ctx: ctx,
cancel: cancel,
store: map[string]interface{}{},
}, nil
}
func (rnr *cdpRunner) Close() error {
if rnr.cancel == nil {
return nil
}
rnr.cancel()
rnr.cancel = nil
return nil
}
func (rnr *cdpRunner) Run(_ context.Context, cas CDPActions) error {
rnr.operator.capturers.captureCDPStart(rnr.name)
defer rnr.operator.capturers.captureCDPEnd(rnr.name)
// Set a timeout (cdpTimeoutByStep) for each step because Chrome operations may get stuck depending on the actions: specified.
called := false
defer func() {
called = true
}()
timer := time.NewTimer(cdpTimeoutByStep)
go func() {
<-timer.C
if !called {
rnr.Close()
}
}()
before := []chromedp.Action{
chromedp.EmulateViewport(cdpWindowWidth, cdpWindowHeight),
}
if err := chromedp.Run(rnr.ctx, before...); err != nil {
return err
}
for i, ca := range cas {
rnr.operator.capturers.captureCDPAction(ca)
as, err := rnr.evalAction(ca)
if err != nil {
return fmt.Errorf("actions[%d] error: %w", i, err)
}
if err := chromedp.Run(rnr.ctx, as...); err != nil {
return fmt.Errorf("actions[%d] error: %w", i, err)
}
fn, err := findCDPFn(ca.Fn)
if err != nil {
return fmt.Errorf("actions[%d] error: %w", i, err)
}
ras := fn.Args.ResArgs()
if len(ras) > 0 {
// capture
res := map[string]interface{}{}
for _, arg := range ras {
v := rnr.store[arg.Key]
switch vv := v.(type) {
case *string:
res[arg.Key] = *vv
case *map[string]string:
res[arg.Key] = *vv
case *[]byte:
res[arg.Key] = *vv
default:
res[arg.Key] = vv
}
}
rnr.operator.capturers.captureCDPResponse(ca, res)
}
}
// record
r := map[string]interface{}{}
for k, v := range rnr.store {
switch vv := v.(type) {
case *string:
r[k] = *vv
case *map[string]string:
r[k] = *vv
case *[]byte:
r[k] = *vv
default:
r[k] = vv
}
}
rnr.operator.record(r)
rnr.store = map[string]interface{}{} // clear
return nil
}
func (rnr *cdpRunner) evalAction(ca CDPAction) ([]chromedp.Action, error) {
fn, err := findCDPFn(ca.Fn)
if err != nil {
return nil, err
}
// path resolution for setUploadFile.path
if ca.Fn == "setUploadFile" {
p, ok := ca.Args["path"]
if !ok {
return nil, fmt.Errorf("invalid action: %v: arg '%s' not found", ca, "path")
}
pp, ok := p.(string)
if !ok {
return nil, fmt.Errorf("invalid action: %v", ca)
}
if !strings.HasPrefix(pp, "/") {
ca.Args["path"] = filepath.Join(rnr.operator.root, pp)
}
}
fv := reflect.ValueOf(fn.Fn)
vs := []reflect.Value{}
for i, a := range fn.Args {
switch a.Typ {
case CDPArgTypeArg:
v, ok := ca.Args[a.Key]
if !ok {
return nil, fmt.Errorf("invalid action: %v: arg '%s' not found", ca, a.Key)
}
if v == nil {
return nil, fmt.Errorf("invalid action arg: %s.%s = %v", ca.Fn, a.Key, v)
}
vs = append(vs, reflect.ValueOf(v))
case CDPArgTypeRes:
k := a.Key
switch reflect.TypeOf(fn.Fn).In(i).Elem().Kind() {
case reflect.String:
var v string
rnr.store[k] = &v
vs = append(vs, reflect.ValueOf(&v))
case reflect.Map:
// ex. attributes
v := map[string]string{}
rnr.store[k] = &v
vs = append(vs, reflect.ValueOf(&v))
case reflect.Slice:
var v []byte
rnr.store[k] = &v
vs = append(vs, reflect.ValueOf(&v))
default:
return nil, fmt.Errorf("invalid action: %v", ca)
}
default:
return nil, fmt.Errorf("invalid action: %v", ca)
}
}
res := fv.Call(vs)
a, ok := res[0].Interface().(chromedp.Action)
if ok {
return []chromedp.Action{a}, nil
}
as, ok := res[0].Interface().([]chromedp.Action)
if ok {
return as, nil
}
return nil, fmt.Errorf("invalid action: %v", ca)
}