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Add retry mechanism #1068

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Add retry mechanism #1068

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70c3e47
init
1204552371 Oct 8, 2023
681f461
eslint fix
1204552371 Oct 8, 2023
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21 changes: 19 additions & 2 deletions lib/policies/proxy/proxy.js
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Original file line number Diff line number Diff line change
Expand Up @@ -61,11 +61,28 @@ module.exports = function (params, config) {
proxyOptions.agent = new ProxyAgent(intermediateProxyUrl);
}

const retryCountMap = {};
const proxy = httpProxy.createProxyServer(Object.assign(params, proxyOptions));
// when http request suucess,clear map
proxy.on('end', (req, res) => {
delete retryCountMap[req.egContext.requestID];
});

// retry function
const maxAutoRetries = params.maxAutoRetries || 1;
proxy.on('error', (err, req, res) => {
logger.warn(err);

const requestID = req.egContext.requestID;
let retryCount = retryCountMap[requestID] || 0;
if (retryCount < maxAutoRetries) {
retryCount++;
retryCountMap[requestID] = retryCount;
// console.log(`retry count: ${retryCount} `, req.originalUrl);
proxyHandler(req, res);
return;
}
delete retryCountMap[requestID];
if (!res.headersSent) {
res.status(502).send('Bad gateway.');
} else {
Expand Down Expand Up @@ -100,10 +117,9 @@ module.exports = function (params, config) {
}
} : () => { };

return function proxyHandler(req, res) {
function proxyHandler(req, res) {
const target = balancer.nextTarget();
const headers = Object.assign({ 'eg-request-id': req.egContext.requestID }, proxyOptions.headers);

stripPathFn(req);

logger.debug(`proxying to ${target.href}, ${req.method} ${req.url}`);
Expand All @@ -115,6 +131,7 @@ module.exports = function (params, config) {
agent: !intermediateProxyUrl ? target.protocol === 'https:' ? httpsAgent : httpAgent : proxyOptions.agent
});
};
return proxyHandler;

// multiple urls will load balance, defaulting to round-robin
};
Expand Down