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avoid memory leakage and circular reference #119

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avoid memory leakage and circular reference #119

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8601680
avoid memory leakage and circular reference
cyfung1031 Aug 16, 2023
a5ed639
moved "avoid memory leakage code" to `stateChangeCallback`
cyfung1031 Aug 16, 2023
3917284
fix: missing return value in setter
cyfung1031 Aug 16, 2023
712d00d
moved "avoid memory leakage code" to `handler.resolve` and `handler.r…
cyfung1031 Aug 16, 2023
4c5a4d0
code typo
cyfung1031 Aug 16, 2023
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41 changes: 33 additions & 8 deletions src/xhr-proxy.js
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Original file line number Diff line number Diff line change
Expand Up @@ -64,11 +64,22 @@ Handler[prototype] = Object.create({
triggerListener(xhr, eventReadyStateChange);
triggerListener(xhr, eventLoad);
triggerListener(xhr, eventLoadEnd);
if (xhr.readyState === 4) {
if (xhr.config) xhr.config.xhr = null;
xhr['on' + eventReadyStateChange] = null;
xhr.config = null;
}
},
reject: function reject(error) {
var xhr = this.xhr;
this.xhrProxy.status = 0;
triggerListener(this.xhr, error.type);
triggerListener(this.xhr, eventLoadEnd);
triggerListener(xhr, error.type);
triggerListener(xhr, eventLoadEnd);
if (xhr.readyState === 4) {
if (xhr.config) xhr.config.xhr = null;
xhr['on' + eventReadyStateChange] = null;
xhr.config = null;
}
}
});

Expand Down Expand Up @@ -149,10 +160,13 @@ function proxyAjax(proxy, win) {
}

function stateChangeCallback(xhr, xhrProxy) {
if (xhr.readyState === 4 && xhr.status !== 0) {
handleResponse(xhr, xhrProxy);
} else if (xhr.readyState !== 4) {
triggerListener(xhr, eventReadyStateChange);
var config = xhr ? xhr.config : null;
if (config && xhr && config.xhr === xhr) {
if (xhr.readyState === 4 && xhr.status !== 0) {
handleResponse(xhr, xhrProxy);
} else if (xhr.readyState !== 4) {
triggerListener(xhr, eventReadyStateChange);
}
}
return true;
}
Expand All @@ -175,11 +189,22 @@ function proxyAjax(proxy, win) {
config.async = args[2];
config.user = args[3];
config.password = args[4];
config.xhr = xhr;
Object.defineProperty(config, 'xhr', {
get() {
return xhr; // xhr wil be set to null after xhr.readyState === XMLHttpRequest.DONE (4)
},
set(nv) {
if (nv === null) xhr = null;
return true;
},
enumerable: false,
configurable: true
});
// config.xhr = xhr;
var evName = 'on' + eventReadyStateChange;
if (!xhr[evName]) {
xhr[evName] = function () {
return stateChangeCallback(xhr, _this);
return stateChangeCallback(this, _this);
};
}

Expand Down