polish the code

front_end/ndb/NetworkInterceptor.js

@@ -35,7 +35,7 @@ Ndb.NetworkInterceptor = class extends Ndb.ConnectionInterceptor {
 
  _sendRawMessage(rawMessage) {}
 
- _listen() {
+ async _listen() {
  InspectorFrontendHost.sendMessageToBackend = rawMessage => {
  const message = JSON.parse(rawMessage);
 
@@ -61,45 +61,39 @@ Ndb.NetworkInterceptor = class extends Ndb.ConnectionInterceptor {
  }
  };
 
- // we need to setTimeout here because the httpMonkeyPatchingSource is loaded
- // after this script
- setTimeout(async() => {
- while (this._target) {
- try {
- const raw = await this._target
- .runtimeAgent()
- .invoke_evaluate({
- expression: `process._fetchNetworkMessages()`,
- awaitPromise: true,
- returnByValue: true
- });
-
- const {
- result: { value: messages }
- } = raw;
-
- if (!messages) return;
-
- // messages is array-like
- const messagesArr = Array.from(JSON.parse(messages));
-
- for (const message of messagesArr) {
- const { type, payload } = message;
- this._cacheRequests.push(message);
-
- // this is on the way back, this way doesn't work
- if (type !== 'Network.getResponseBody') {
- // but this does
- SDK._mainConnection._onMessage(JSON.stringify({
- method: type,
- params: payload
- }));
- }
- }
- } catch (err) {
- console.log({ err });
+ while (this._target) {
+ const rawResponse = await this._target
+ .runtimeAgent()
+ .invoke_evaluate({
+ expression: `process._fetchNetworkMessages()`,
+ awaitPromise: true,
+ returnByValue: true
+ });
+
+ if (!rawResponse || !rawResponse.result) return;
+
+ const {
+ result: { value: messages }
+ } = rawResponse;
+
+ if (!messages) return;
+
+ // messages is array-like
+ const messagesArr = Array.from(JSON.parse(messages));
+
+ for (const message of messagesArr) {
+ const { type, payload } = message;
+ this._cacheRequests.push(message);
+
+ // this is on the way back, this way doesn't work
+ if (type !== 'Network.getResponseBody') {
+ // but this does
+ SDK._mainConnection._onMessage(JSON.stringify({
+ method: type,
+ params: payload
+ }));
  }
  }
- }, 0);
+ }
  }
 };