instead of puppeteer.exposeFunction(), use cdp function bindings directly to avoid issues custom toJSON overrides:

- add Runtime.addBinding for each exposed function, handle in one place with Runtime.bindingCalled
- convert binding names to BxFunctionBindings enum
- update to browsertrix-behaviors 0.7.1 to avoid waiting for return value
- fixes #770

package.json

@@ -18,7 +18,7 @@
   "dependencies": {
     "@novnc/novnc": "1.4.0",
     "@webrecorder/wabac": "^2.20.8",
-    "browsertrix-behaviors": "^0.7.0",
+    "browsertrix-behaviors": "^0.7.1",
     "client-zip": "^2.4.5",
     "css-selector-parser": "^3.0.5",
     "fetch-socks": "^1.3.0",

src/crawler.ts

@@ -40,9 +40,7 @@ import { collectCustomBehaviors, getInfoString } from "./util/file_reader.js";
 import { Browser } from "./util/browser.js";
 
 import {
-  ADD_LINK_FUNC,
-  BEHAVIOR_LOG_FUNC,
-  FETCH_FUNC,
+  BxFunctionBindings,
   DISPLAY,
   ExtractSelector,
   PAGE_OP_TIMEOUT_SECS,
@@ -768,17 +766,43 @@ export class Crawler {
       await this.screencaster.screencastPage(page, cdp, workerid);
     }
 
-    await page.exposeFunction(
-      ADD_LINK_FUNC,
-      (url: string) => callbacks.addLink && callbacks.addLink(url),
-    );
+    cdp.on("Runtime.bindingCalled", (params) => {
+      const { name, payload } = params;
+
+      switch (name as BxFunctionBindings) {
+        case BxFunctionBindings.AddLinkFunc:
+          callbacks.addLink && callbacks.addLink(payload);
+          break;
+
+        case BxFunctionBindings.BehaviorLogFunc:
+          {
+            const logdata: { data: string; type: string } = JSON.parse(payload);
+            this._behaviorLog(logdata, page.url(), workerid);
+          }
+          break;
+
+        case BxFunctionBindings.FetchFunc:
+          if (recorder) {
+            recorder.addExternalFetch(payload, cdp);
+          }
+          break;
+
+        case BxFunctionBindings.AddToSeenSet:
+          this.crawlState
+            .addToUserSet(payload)
+            .catch((e) => logger.warn("Adding to URL set error", e));
+          break;
+      }
+    });
+
+    await cdp.send("Runtime.addBinding", {
+      name: BxFunctionBindings.AddLinkFunc,
+    });
 
     if (this.params.behaviorOpts) {
-      await page.exposeFunction(
-        BEHAVIOR_LOG_FUNC,
-        (logdata: { data: string; type: string }) =>
-          this._behaviorLog(logdata, page.url(), workerid),
-      );
+      await cdp.send("Runtime.addBinding", {
+        name: BxFunctionBindings.BehaviorLogFunc,
+      });
       await this.browser.addInitScript(page, behaviors);
 
       const initScript = `
@@ -791,9 +815,11 @@ self.__bx_behaviors.selectMainBehavior();
         this.behaviorsChecked = true;
       }
 
-      await page.exposeFunction(FETCH_FUNC, (url: string) => {
-        return recorder ? recorder.addExternalFetch(url, cdp) : true;
-      });
+      if (recorder) {
+        await cdp.send("Runtime.addBinding", {
+          name: BxFunctionBindings.FetchFunc,
+        });
+      }
 
       await this.browser.addInitScript(page, initScript);
     }
@@ -873,11 +899,9 @@ self.__bx_behaviors.selectMainBehavior();
       }
     }
 
-    await page.exposeFunction("__bx_addSet", (data: string) =>
-      this.crawlState.addToUserSet(data),
-    );
-
-    // await page.exposeFunction("__bx_hasSet", (data: string) => this.crawlState.hasUserSet(data));
+    await cdp.send("Runtime.addBinding", {
+      name: BxFunctionBindings.AddToSeenSet,
+    });
   }
 
   async setupExecContextEvents(
@@ -2295,7 +2319,7 @@ self.__bx_behaviors.selectMainBehavior();
                 selector,
                 extract,
                 isAttribute,
-                addLinkFunc: ADD_LINK_FUNC,
+                addLinkFunc: BxFunctionBindings.AddLinkFunc,
               })
               .catch((e) =>
                 logger.warn("Link Extraction failed in frame", {

src/util/argParser.ts

@@ -10,7 +10,6 @@ import { hideBin } from "yargs/helpers";
 import { createParser } from "css-selector-parser";
 
 import {
-  BEHAVIOR_LOG_FUNC,
   WAIT_UNTIL_OPTS,
   EXTRACT_TEXT_TYPES,
   SERVICE_WORKER_OPTS,
@@ -18,6 +17,7 @@ import {
   BEHAVIOR_TYPES,
   ExtractSelector,
   DEFAULT_MAX_RETRIES,
+  BxFunctionBindings,
 } from "./constants.js";
 import { ScopedSeed } from "./seeds.js";
 import { interpolateFilename } from "./storage.js";
@@ -721,7 +721,7 @@ class ArgParser {
           );
         }
       });
-      behaviorOpts.log = BEHAVIOR_LOG_FUNC;
+      behaviorOpts.log = BxFunctionBindings.BehaviorLogFunc;
       behaviorOpts.startEarly = true;
       behaviorOpts.clickSelector = argv.clickSelector;
       argv.behaviorOpts = JSON.stringify(behaviorOpts);

src/util/constants.ts

@@ -22,9 +22,12 @@ export const DETECT_SITEMAP = "<detect>";
 
 export const EXTRACT_TEXT_TYPES = ["to-pages", "to-warc", "final-to-warc"];
 
-export const BEHAVIOR_LOG_FUNC = "__bx_log";
-export const ADD_LINK_FUNC = "__bx_addLink";
-export const FETCH_FUNC = "__bx_fetch";
+export enum BxFunctionBindings {
+  BehaviorLogFunc = "__bx_log",
+  AddLinkFunc = "__bx_addLink",
+  FetchFunc = "__bx_fetch",
+  AddToSeenSet = "__bx_addSet",
+}
 
 export const MAX_DEPTH = 1000000;
 export const DEFAULT_MAX_RETRIES = 2;

yarn.lock

@@ -1460,10 +1460,10 @@ browserslist@^4.24.0:
     node-releases "^2.0.18"
     update-browserslist-db "^1.1.1"
 
-browsertrix-behaviors@^0.7.0:
-  version "0.7.0"
-  resolved "https://registry.yarnpkg.com/browsertrix-behaviors/-/browsertrix-behaviors-0.7.0.tgz#a08b7d3e9cd449d0d76b14a438e28472124fd1a4"
-  integrity sha512-t0X74puXJsH8sVkkVZwEdo8L5E1PYtzX/RkVXM4fwwBIL804bOB8WIV+5Dfwov/odaukhB67KZhM00hN60SiBA==
+browsertrix-behaviors@^0.7.1:
+  version "0.7.1"
+  resolved "https://registry.yarnpkg.com/browsertrix-behaviors/-/browsertrix-behaviors-0.7.1.tgz#dcb30c038e4060ef2393eb001ce9f10e3ce71c39"
+  integrity sha512-tZ7Bv/IAWzLTNORf/yQqGHpPAQ4tP8sxql8YT491VHlCk939F1YIUrQ36XJOaSyfjmmm2WV9nCMXkDpCsw6zQg==
   dependencies:
     query-selector-shadow-dom "^1.0.1"