forked from rajasankars/ideacrawler
-
Notifications
You must be signed in to change notification settings - Fork 1
/
chromeclient.go
371 lines (339 loc) · 10.1 KB
/
chromeclient.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
/*************************************************************************
*
* Copyright 2018 Ideas2IT Technology Services Private Limited.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
***********************************************************************/
package chromeclient
import (
"context"
"encoding/json"
"fmt"
"github.com/mafredri/cdp"
"github.com/mafredri/cdp/devtool"
"github.com/mafredri/cdp/protocol/dom"
"github.com/mafredri/cdp/protocol/network"
"github.com/mafredri/cdp/protocol/page"
"github.com/mafredri/cdp/protocol/runtime"
"github.com/mafredri/cdp/rpcc"
"io/ioutil"
"log"
"net/http"
"net/url"
"os/exec"
"strconv"
"strings"
"sync"
"time"
"golang.org/x/sync/errgroup"
)
type ChromeClient struct {
cpath string // path to browser binary
devt *devtool.DevTools
pageTgt *devtool.Target
conn *rpcc.Conn
c *cdp.Client
ctx context.Context
cancel context.CancelFunc
chromeCmd *exec.Cmd
domLoadTime time.Duration
rspRcvd network.ResponseReceivedClient
started bool
mu sync.Mutex
}
func NewChromeClient(path string) *ChromeClient {
ctx, cancel := context.WithCancel(context.Background())
return &ChromeClient{
cpath: path,
devt: nil,
chromeCmd: nil,
ctx: ctx,
cancel: cancel,
domLoadTime: 5 * time.Second, // default 5 secs for page to load in browser before we get dump.
}
}
func (cc *ChromeClient) SetDomLoadTime(secs int32) {
cc.domLoadTime = time.Duration(secs) * time.Second
}
func (cc *ChromeClient) Stop() {
cc.conn.Close()
cc.cancel()
err := cc.chromeCmd.Process.Kill()
if err != nil {
log.Println(err)
}
}
func (cc *ChromeClient) Start() error {
var err error
cc.chromeCmd = exec.Command(cc.cpath, "--headless", "--disable-gpu", "--remote-debugging-port=9222")
err = cc.chromeCmd.Start()
time.Sleep(3 * time.Second) // TODO: make customizable. give a few seconds for browser to start.
if err != nil {
log.Panic("Unable to start chrome browser in path '" + cc.cpath + "'. Error - " + err.Error())
}
cc.devt = devtool.New("http://localhost:9222")
cc.pageTgt, err = cc.devt.Get(cc.ctx, devtool.Page)
if err != nil {
log.Println(err)
return err
}
cc.conn, err = rpcc.DialContext(cc.ctx, cc.pageTgt.WebSocketDebuggerURL)
if err != nil {
log.Println(err)
return err
}
// Create a new CDP Client that uses conn.
cc.c = cdp.NewClient(cc.conn)
if err = runBatch(
// Enable all the domain events that we're interested in.
func() error { return cc.c.DOM.Enable(cc.ctx) },
func() error { return cc.c.Network.Enable(cc.ctx, nil) },
func() error { return cc.c.Page.Enable(cc.ctx) },
func() error { return cc.c.Runtime.Enable(cc.ctx) },
); err != nil {
log.Panic(err)
}
cc.rspRcvd, err = cc.c.Network.ResponseReceived(cc.ctx)
if err != nil {
log.Panic(err)
}
return err
}
// "http://" types, or "crawljs-builtinjs://<hostname>/<js>?<url> or
// "crawljs-jscript://<hostname>/<builtin OP name>"
func (cc *ChromeClient) Do(req *http.Request) (resp *http.Response, err error) {
cc.mu.Lock()
defer cc.mu.Unlock()
if strings.HasPrefix(req.URL.Scheme, "crawljs") {
return cc.doJS(req)
}
return cc.doNavigate(req)
}
func (cc *ChromeClient) doNavigate(req *http.Request) (resp *http.Response, err error) {
var url = req.URL.String()
log.Printf("Chrome doing: %v\n", url)
domLoadTimer := time.After(cc.domLoadTime)
err = navigate(cc.ctx, cc.c.Page, url, cc.domLoadTime)
if err != nil {
log.Println(err)
return nil, err
}
<-domLoadTimer
navhist, _ := cc.c.Page.GetNavigationHistory(cc.ctx)
<-cc.rspRcvd.Ready()
rsp, err := cc.rspRcvd.Recv()
currUrl := navhist.Entries[navhist.CurrentIndex].URL
log.Printf("Current URL: %v\n", currUrl)
for {
if err != nil {
log.Println(err)
return nil, err
}
if rsp.Response.URL == currUrl || rsp.Response.URL+"/" == currUrl || rsp.Response.URL == currUrl+"/" {
break
}
<-cc.rspRcvd.Ready()
rsp, err = cc.rspRcvd.Recv()
}
doc, err := cc.c.DOM.GetDocument(cc.ctx, nil)
if err != nil {
log.Println(err)
return nil, err
}
ohtml, err := cc.c.DOM.GetOuterHTML(cc.ctx, &dom.GetOuterHTMLArgs{
NodeID: &doc.Root.NodeID,
})
if err != nil {
log.Println(err)
return nil, err
}
resp1 := &http.Response{
StatusCode: int(rsp.Response.Status),
Status: rsp.Response.StatusText,
Body: ioutil.NopCloser(strings.NewReader(ohtml.OuterHTML)),
Request: req,
Header: make(http.Header),
}
rspHdrs, _ := rsp.Response.Headers.Map()
for kk, vv := range rspHdrs {
if strings.ToLower(kk) == "content-type" {
resp1.Header.Set("Content-Type", vv)
break
}
}
return resp1, nil
}
func (cc *ChromeClient) doJS(req *http.Request) (resp *http.Response, err error) {
domLoadTimer := time.After(cc.domLoadTime)
jscommand, err := url.PathUnescape(req.URL.Path)
if err != nil {
log.Println(err)
return nil, err
}
tgtUrl, err := url.QueryUnescape(req.URL.RawQuery)
navhist, _ := cc.c.Page.GetNavigationHistory(cc.ctx)
currUrl := navhist.Entries[navhist.CurrentIndex].URL
if tgtUrl != currUrl && tgtUrl+"/" != currUrl && tgtUrl != currUrl+"/" {
domNavigateTimer := time.After(cc.domLoadTime)
log.Printf("Navigating to %v\n", tgtUrl)
tgtURL, err := url.Parse(tgtUrl)
if err != nil {
log.Printf("doJS: unable to parse tgt url: %v\n", err)
return nil, err
}
navRsp, err := cc.doNavigate(&http.Request{
URL: tgtURL,
})
if err != nil {
log.Printf("Navigation failed: %v\n", err)
return nil, err
}
if navRsp.StatusCode != 200 {
log.Printf("HTTP Status Code was: %v; Use AddPage in chrome mode instead, to get page sent back anyway.")
return nil, err
}
<-domNavigateTimer
}
if strings.HasSuffix(req.URL.Scheme, "builtinjs") {
switch jscommand {
case "/scrollToEnd":
expression := `window.scrollTo(0, document.body.scrollHeight)`
evalArgs := runtime.NewEvaluateArgs(expression)
_, err := cc.c.Runtime.Evaluate(cc.ctx, evalArgs)
if err != nil {
log.Println(err)
return nil, err
}
case "/infiniteScrollToEnd":
expression := `new Promise((resolve, reject) => {
prevHeight=document.body.scrollHeight;
window.scrollTo(0, document.body.scrollHeight);
setTimeout(() => {
newHeight=document.body.scrollHeight;
resolve({"O": prevHeight, "N": newHeight});
}, ` + strconv.Itoa(int(cc.domLoadTime/time.Millisecond)) + `);
});
`
for {
evalArgs := runtime.NewEvaluateArgs(expression).SetAwaitPromise(true).SetReturnByValue(true)
eval, err := cc.c.Runtime.Evaluate(cc.ctx, evalArgs)
if err != nil {
log.Println(err)
return nil, err
}
heights := &struct {
O int
N int
}{}
if err = json.Unmarshal(eval.Result.Value, &heights); err != nil {
log.Println(err)
return nil, err
}
if heights.O == heights.N {
log.Printf("Old height = new height = %v. We're probably done scrolling.\n", heights.O)
break
}
log.Printf("Old height: %v; New height: %v; Continuing to scroll down.\n", heights.O, heights.N)
}
}
} else if strings.HasSuffix(req.URL.Scheme, "jscript") {
evalArgs := runtime.NewEvaluateArgs(jscommand)
_, err := cc.c.Runtime.Evaluate(cc.ctx, evalArgs)
if err != nil {
log.Println(err)
return nil, err
}
}
<-domLoadTimer
doc, err := cc.c.DOM.GetDocument(cc.ctx, nil)
if err != nil {
log.Println(err)
return nil, err
}
ohtml, err := cc.c.DOM.GetOuterHTML(cc.ctx, &dom.GetOuterHTMLArgs{
NodeID: &doc.Root.NodeID,
})
if err != nil {
log.Println(err)
return nil, err
}
navhist, _ = cc.c.Page.GetNavigationHistory(cc.ctx)
currURL, err := url.Parse(navhist.Entries[navhist.CurrentIndex].URL)
if err != nil {
log.Println(err)
return nil, err
}
req.URL = currURL
resp1 := &http.Response{
StatusCode: 900,
Status: "",
Body: ioutil.NopCloser(strings.NewReader(ohtml.OuterHTML)),
Request: req,
Header: make(http.Header),
}
resp1.Header.Set("Content-Type", "text/html")
return resp1, nil
}
func navigate(ctx context.Context, pageClient cdp.Page, url string, timeout time.Duration) error {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, timeout)
defer cancel()
// Make sure Page events are enabled.
err := pageClient.Enable(ctx)
if err != nil {
return err
}
// Open client for DOMContentEventFired to block until DOM has fully loaded.
domContentEventFired, err := pageClient.DOMContentEventFired(ctx)
if err != nil {
return err
}
defer domContentEventFired.Close()
_, err = pageClient.Navigate(ctx, page.NewNavigateArgs(url))
if err != nil {
return err
}
_, err = domContentEventFired.Recv()
return err
}
// runBatchFunc is the function signature for runBatch.
type runBatchFunc func() error
// runBatch runs all functions simultaneously and waits until
// execution has completed or an error is encountered.
func runBatch(fn ...runBatchFunc) error {
eg := errgroup.Group{}
for _, f := range fn {
eg.Go(f)
}
return eg.Wait()
}
func zmain() {
cl := NewChromeClient("/usr/lib64/chromium-browser/headless_shell")
cl.Start()
defer cl.Stop()
urlobj, _ := url.Parse("http://books.toscrape.com/")
req := &http.Request{
URL: urlobj,
}
r, err := cl.Do(req)
pagebody, err := ioutil.ReadAll(r.Body)
fmt.Println(err, string(pagebody))
urlobj, _ = url.Parse("http://quotes.toscrape.com/")
req = &http.Request{
URL: urlobj,
}
r, err = cl.Do(req)
pagebody, err = ioutil.ReadAll(r.Body)
fmt.Println(err, string(pagebody))
}