hystrix-too-busy
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Provides a backpressure management hystrix command partially based on too-busy module logic and utilizing hystrix metrics accumulation and circuit breaking
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">'use strict';
const Hystrix = require('hystrixjs');
const commandFactory = Hystrix.commandFactory;
const circuitFactory = Hystrix.circuitFactory;
const metricsFactory = Hystrix.metricsFactory;
const GROUP = 'TooBusyGroup';
const PREFIX = 'too-busy-';
const toobusy = require('toobusy-js');
Object.assign(module.exports, toobusy);
const DEFAULT_CONFIG = {
circuitBreakerErrorThresholdPercentage: 50, // optional
circuitBreakerForceClosed: false, // optional
circuitBreakerForceOpened: false, // optional
circuitBreakerRequestVolumeThreshold: 20, // optional
circuitBreakerSleepWindowInMilliseconds: 5000, // optional
requestVolumeRejectionThreshold: 0, // optional
statisticalWindowNumberOfBuckets: 10, // optional
statisticalWindowLength: 10000, // optional
percentileWindowNumberOfBuckets: 6, // optional
percentileWindowLength: 60000 // optional
};
let tooBusyConfig = {
default: DEFAULT_CONFIG
};
/*
Too busy module lacks a floating window of observations over time which leads to false positives for
too busy signal.
By using hystrix we get a flowting monitor window which should eliminate false positives.
The tresholds are controlled by hsyrtix command configuration.
Now it will emit tooBusy only when the system accumulated many of them
*/
module.exports.getStatus = function getStatus(name, callback) {
if (arguments.length === 1) {
callback = name;
name = undefined;
}
getCommand(name)
.execute()
.then(() => callback(false))
.catch(err => {
if (err.message === 'OpenCircuitError') {
return callback(true);
}
// otherwise we are all good and supress too busy error
callback(false);
});
};
function getCommand(name) {
const commandName = PREFIX + (name || 'hystrix-command');
const builder = commandFactory
.getOrCreate(commandName, GROUP);
const commandConfig = tooBusyConfig.commands && tooBusyConfig.commands[name];
builder.config = commandConfig ||
tooBusyConfig.default;
builder.run(function run() {
return new Promise((resolve, reject) => {
if (module.exports.deps.toobusy()) {
return reject(new Error('TooBusy'));
}
resolve();
});
});
return builder.build();
}
// expose for easy testing
module.exports.deps = {
Hystrix: Hystrix,
toobusy: toobusy
};
Object.defineProperty(module.exports, 'command', {
get: function () {
return getCommand();
}
});
module.exports.init = function init(config) {
commandFactory.resetCache();
circuitFactory.resetCache();
metricsFactory.resetCache();
config = config || {};
if (config.default) {
tooBusyConfig.default = Object.assign(tooBusyConfig.default,
config.default);
}
if (config.commands) {
tooBusyConfig.commands = tooBusyConfig.commands || {};
Object.keys(config.commands).forEach(name => {
tooBusyConfig.commands[name] =
Object.assign({}, tooBusyConfig.default,
config.commands[name]);
});
}
if (config.latencyThreshold) {
module.exports.maxLag(config.latencyThreshold);
}
if (config.interval) {
module.exports.interval(config.interval);
}
if (config.smoothingFactor) {
module.exports.smoothingFactor(config.smoothingFactor);
}
};
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