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attempt retries to spawn connection upon transient error #294

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attempt retries to spawn connection upon transient error #294

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32 changes: 32 additions & 0 deletions helpers/private/connection/spawn-connection.js
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,38 @@ module.exports = function spawnConnection(datastore, cb) {
return cb(err);
},
failed: function failedToConnect(err) {

function isTransientError(err) {
var errorMessage = err.message || (err.error || {}).message || "";
var errorCode = err.code || (err.error || {}).code || "";
return errorMessage.indexOf("Client has encountered a connection error") >= 0 ||
errorMessage.indexOf("terminating connection") >= 0 ||
errorMessage.indexOf("Connection terminated") >= 0 ||
["ECONNRESET", "ECONNREFUSED"].indexOf(errorCode) >= 0;
}

if (datastore.config.attemptRetries &&
isTransientError(err) &&
(datastore.retryCount || 0) < datastore.config.attemptRetries) {
console.error("Error is transient, trying again in " + 2 * 4 ** (datastore.retryCount || 0) + " seconds.");
try {
setTimeout(() => {
var newFirstParam = Object.assign({}, datastore, { retryCount: (datastore.retryCount || 0) + 1 });
spawnConnection(newFirstParam, (cbErr, cbResult) => {
if (cbErr) {
cb(cbErr);
return;
}
cb(null, cbResult);
});
}, 2000 * 4 ** (datastore.retryCount || 0));
} catch (retryError) {
console.error("Error during retry regimen");
cb(err);
}
return;
}

// Setup some basic troubleshooting tips
console.error('Troubleshooting tips:');
console.error('');
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