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opossum - npm Package Compare versions
Comparing version 6.0.0 to 6.0.1
@@ -5,2 +5,10 @@ # Changelog | ||
| ### [6.0.1](https://www.github.com/nodeshift/opossum/compare/v6.0.0...v6.0.1) (2021-04-15) | ||
| ### Bug Fixes | ||
| * return errors from invocation filtered errors ([#567](https://www.github.com/nodeshift/opossum/issues/567)) ([737e1b1](https://www.github.com/nodeshift/opossum/commit/737e1b1bbd5e440791d0b06f5b837073c0d2bdbf)), closes [#556](https://www.github.com/nodeshift/opossum/issues/556) | ||
| * **docs:** Fix documentation for default value of rollingPercentilesEnabled ([#563](https://www.github.com/nodeshift/opossum/issues/563)) ([93d5969](https://www.github.com/nodeshift/opossum/commit/93d59697c614a4b567fee63d76201f151a6ecef8)) | ||
| ## [6.0.0](https://www.github.com/nodeshift/opossum/compare/v5.1.3...v6.0.0) (2021-03-18) | ||
@@ -7,0 +15,0 @@ |
@@ -1,2 +0,2 @@ | ||
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this[P]}},{key:"volumeThreshold",get:function(){return this[_]}},{key:"fallback",value:function(e){var t=e;return e instanceof f&&(t=function(){return e.fire.apply(e,arguments)}),this[E]=t,this}},{key:"fire",value:function(){for(var e=arguments.length,t=new Array(e),n=0;n<e;n++)t[n]=arguments[n];return this.call.apply(this,[this.action].concat(t))}},{key:"call",value:function(e){var t=this;if(this.isShutdown){var n=F("The circuit has been shutdown.","ESHUTDOWN");return Promise.reject(n)}for(var r=arguments.length,o=new Array(r>1?r-1:0),i=1;i<r;i++)o[i-1]=arguments[i];var u,c=Array.prototype.slice.call(o);if(this.emit("fire",c),void 0!==T.get(this))return this.emit("cacheHit"),T.get(this);if(this.options.cache&&this.emit("cacheMiss"),!this[k]){var s=this.action.apply(e,c);return"function"==typeof s.then?s:Promise.resolve(s)}if(!this.closed&&!this.pendingClose){var a=F("Breaker is open","EOPENBREAKER");return this.emit("reject",a),q(this,a,c)||Promise.reject(a)}this[w]=!1;var f=!1;return 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TypeError("Health check interval must be a number");var r=function(t){e.apply(n).catch((function(e){n.emit("healthCheckFailed",e),n.open()}))},o=setInterval(r,t);"function"==typeof o.unref&&o.unref(),r()}},{key:"enable",value:function(){this[k]=!0}},{key:"disable",value:function(){this[k]=!1}}])&&c(n.prototype,r),o&&c(n,o),f}(h);function R(e,t,n,r,i,u,c){var s;if(clearTimeout(n),(s=t.options).errorFilter.apply(s,[e].concat(o(r))))t.emit("success",e,i);else{!function(e,t,n,r){if(e.emit("failure",t,r,n),e.warmUp)return;var o=e.stats;if(o.fires<e.volumeThreshold&&!e.halfOpen)return;(o.failures/o.fires*100>e.options.errorThresholdPercentage||o.failures>=e.options.maxFailures||e.halfOpen)&&e.open()}(t,e,r,i);var a=q(t,e,r);if(a)return u(a)}c(e)}function q(e,t,n){if(e[E])try{var r=e[E].apply(e[E],[].concat(o(n),[t]));return e.emit("fallback",r,t),r instanceof Promise?r:Promise.resolve(r)}catch(e){return Promise.reject(e)}}function F(e,t){var n=new Error(e);return n.code=t,n[L]=!0,n}var 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e.copy&&"function"==typeof e.fill&&"function"==typeof e.readUInt8}},function(e,t){"function"==typeof Object.create?e.exports=function(e,t){e.super_=t,e.prototype=Object.create(t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}})}:e.exports=function(e,t){e.super_=t;var n=function(){};n.prototype=t.prototype,e.prototype=new n,e.prototype.constructor=e}},function(e,t,n){"use strict";(function(t){var r=n(10); | ||
| /*! | ||
@@ -3,0 +3,0 @@ * The buffer module from node.js, for the browser. |
@@ -55,3 +55,3 @@ 'use strict'; | ||
| * If they are disabled, all summary statistics (mean, percentiles) are | ||
| * returned as -1. Default: false | ||
| * returned as -1. Default: true | ||
| * @param {Number} options.capacity the number of concurrent requests allowed. | ||
@@ -659,14 +659,16 @@ * If the number currently executing function calls is equal to | ||
| let errorFiltered; | ||
| if ((errorFiltered = circuit.options.errorFilter(error, ...args))) { | ||
| if (circuit.options.errorFilter(error, ...args)) { | ||
| // The error was filtered, so emit 'success' | ||
| circuit.emit('success', error, latency); | ||
| resolve(errorFiltered); | ||
| } else { | ||
| // Error was not filtered, so emit 'failure' | ||
| fail(circuit, error, args, latency); | ||
| // Only call the fallback function if there errorFilter doesn't succeed | ||
| // Only call the fallback function if errorFilter doesn't succeed | ||
| // If the fallback function succeeds, resolve | ||
| const fb = fallback(circuit, error, args); | ||
| if (fb) resolve(fb); | ||
| else reject(error); | ||
| if (fb) return resolve(fb); | ||
| } | ||
| // In all other cases, reject | ||
| reject(error); | ||
| } | ||
@@ -673,0 +675,0 @@ |
| { | ||
| "name": "opossum", | ||
| "version": "6.0.0", | ||
| "version": "6.0.1", | ||
| "author": "Red Hat, Inc.", | ||
@@ -21,3 +21,4 @@ "license": "Apache-2.0", | ||
| "lint": "standardx test/*.js index.js lib/*.js test/*/*.js", | ||
| "clean": "rm -rf node_modules dist/*.js test/browser/webpack-test.js" | ||
| "clean": "rm -rf node_modules dist/*.js test/browser/webpack-test.js", | ||
| "prepublishOnly": "npm run build" | ||
| }, | ||
@@ -24,0 +25,0 @@ "standard-version": { |
@@ -246,2 +246,55 @@ # opossum | ||
| ### Calculating errorThresholdPercentage | ||
| The `errorThresholdPercentage` value is compared to the error rate. That rate is determined by dividing the number of failures by the number of times the circuit has been fired. You can see this comparison here: | ||
| ```js | ||
| // check stats to see if the circuit should be opened | ||
| const stats = circuit.stats; | ||
| if ((stats.fires < circuit.volumeThreshold) && !circuit.halfOpen) return; | ||
| const errorRate = stats.failures / stats.fires * 100; | ||
| if (errorRate > circuit.options.errorThresholdPercentage || | ||
| stats.failures >= circuit.options.maxFailures || | ||
| circuit.halfOpen) { | ||
| circuit.open(); | ||
| } | ||
| ``` | ||
| The numbers for `fires` and `failures` come from the stats that are indeed governed by `rollingCountTimeout` and `rollingCountBuckets`. The timeout value is the total number of seconds for which the stats are being maintained, and the buckets value is the number of slots in the window. The defaults are 10 seconds and 10 buckets. So, the statistics that are being compared against `errorThresholdPercentage` are based on 10 samples, one per second over the last 10 seconds. | ||
| Example: a circuit is fired 24 times over 10 seconds with a somewhat bursty pattern, failing three times. | ||
| ``` | ||
| | fires: 2 | fires: 1 | fires: 3 | fires: 0 | fires: 9 | fires: 3 | fires: 2 | fires: 0 | fires: 8 | fires: 0 | | ||
| | fails: 0 | fails: 0 | fails: 0 | fails: 0 | fails: 0 | fails: 3 | fails: 0 | fails: 0 | fails: 0 | fails: 0 | | ||
| ``` | ||
| The failure rate here is 3/24 or 1/8 or 12.5%. The default error threshold is 50%, so in this case, the circuit would not open. However, if you modified the `rollingCountTimeout` to 3 seconds, and the `rollingCountBuckets` to 3 (not recommended), then the stats array might look like these three seconds from above. | ||
| ``` | ||
| | fires: 3 | fires: 2 | fires: 0 | | ||
| | fails: 3 | fails: 0 | fails: 0 | | ||
| ``` | ||
| Now, without changing `errorThresholdPercentage` our circuit will open because our error rate is now 3/5 or 60%. It's tricky to test this stuff because the array of statistics is a rolling count. Every second the oldest bucket is removed and a new one is added, so the totals change constantly in a way that may not be intuitive. | ||
| For example, if the first example is shifted right, dropping the first bucket and adding another with `fires: 3` the total number of `fires` now in the stats is not 27 (24+3) but 25 (24-2+3). | ||
| The code that is summing the stats samples is here: | ||
| ```js | ||
| const totals = this[WINDOW].reduce((acc, val) => { | ||
| if (!val) { return acc; } | ||
| Object.keys(acc).forEach(key => { | ||
| if (key !== 'latencyTimes' && key !== 'percentiles') { | ||
| (acc[key] += val[key] || 0); | ||
| } | ||
| }); | ||
| if (this.rollingPercentilesEnabled) { | ||
| acc.latencyTimes.push.apply(acc.latencyTimes, val.latencyTimes || []); | ||
| } | ||
| return acc; | ||
| }, bucket()); | ||
| ``` | ||
| ### Typings | ||
@@ -248,0 +301,0 @@ |
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Improved metrics
- Total package byte prevSize
- increased by0.47%
820918
- Lines of code
- increased by0.1%
4057
- Number of lines in readme file
- increased by18.53%
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