opossum - npm Package Compare versions

Comparing version 6.0.1 to 6.1.0

CHANGELOG.md

@@ -5,2 +5,9 @@ # Changelog
 
+## [6.1.0](https://www.github.com/nodeshift/opossum/compare/v6.0.1...v6.1.0) (2021-05-06)
+
+
+### Features
+
+* Add the ability to prime a breaker with previous stats ([#568](https://www.github.com/nodeshift/opossum/issues/568)) ([be26d74](https://www.github.com/nodeshift/opossum/commit/be26d74e30e7c13386cd2b2eacf89ca964e1467d))
+
 ### [6.0.1](https://www.github.com/nodeshift/opossum/compare/v6.0.0...v6.0.1) (2021-04-15)
@@ -7,0 +14,0 @@

dist/opossum.min.js

@@ -1,2 +0,2 @@
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+*/var r=Object.getOwnPropertySymbols,o=Object.prototype.hasOwnProperty,i=Object.prototype.propertyIsEnumerable;function u(e){if(null==e)throw new TypeError("Object.assign cannot be called with null or undefined");return Object(e)}e.exports=function(){try{if(!Object.assign)return!1;var e=new String("abc");if(e[5]="de","5"===Object.getOwnPropertyNames(e)[0])return!1;for(var t={},n=0;n<10;n++)t["_"+String.fromCharCode(n)]=n;if("0123456789"!==Object.getOwnPropertyNames(t).map((function(e){return t[e]})).join(""))return!1;var r={};return"abcdefghijklmnopqrst".split("").forEach((function(e){r[e]=e})),"abcdefghijklmnopqrst"===Object.keys(Object.assign({},r)).join("")}catch(e){return!1}}()?Object.assign:function(e,t){for(var n,c,s=u(e),a=1;a<arguments.length;a++){for(var f in n=Object(arguments[a]))o.call(n,f)&&(s[f]=n[f]);if(r){c=r(n);for(var l=0;l<c.length;l++)i.call(n,c[l])&&(s[c[l]]=n[c[l]])}}return s}},function(e,t,n){"use strict";function r(e){return(r="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}function o(e,t){var n=Object.keys(e);if(Object.getOwnPropertySymbols){var r=Object.getOwnPropertySymbols(e);t&&(r=r.filter((function(t){return Object.getOwnPropertyDescriptor(e,t).enumerable}))),n.push.apply(n,r)}return n}function i(e){for(var t=1;t<arguments.length;t++){var n=null!=arguments[t]?arguments[t]:{};t%2?o(Object(n),!0).forEach((function(t){u(e,t,n[t])})):Object.getOwnPropertyDescriptors?Object.defineProperties(e,Object.getOwnPropertyDescriptors(n)):o(Object(n)).forEach((function(t){Object.defineProperty(e,t,Object.getOwnPropertyDescriptor(n,t))}))}return e}function u(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}function c(e,t){for(var n=0;n<t.length;n++){var r=t[n];r.enumerable=r.enumerable||!1,r.configurable=!0,"value"in r&&(r.writable=!0),Object.defineProperty(e,r.key,r)}}function s(e,t){return(s=Object.setPrototypeOf||function(e,t){return e.__proto__=t,e})(e,t)}function a(e){var t=function(){if("undefined"==typeof Reflect||!Reflect.construct)return!1;if(Reflect.construct.sham)return!1;if("function"==typeof Proxy)return!0;try{return Boolean.prototype.valueOf.call(Reflect.construct(Boolean,[],(function(){}))),!0}catch(e){return!1}}();return function(){var n,r=l(e);if(t){var o=l(this).constructor;n=Reflect.construct(r,arguments,o)}else n=r.apply(this,arguments);return f(this,n)}}function f(e,t){return!t||"object"!==r(t)&&"function"!=typeof t?function(e){if(void 0===e)throw new ReferenceError("this hasn't been initialised - 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 //# sourceMappingURL=opossum.min.map

lib/circuit.js

@@ -34,2 +34,4 @@ 'use strict';
  * @param {Object} options Options for the {@link CircuitBreaker}
+ * @param {Status} options.status A {@link Status} object that might
+ *   have pre-prime stats
  * @param {Number} options.timeout The time in milliseconds that action should
@@ -114,2 +116,16 @@ * be allowed to execute before timing out. Timeout can be disabled by setting
 
+   /**
+  * Create a new Status object,
+  * helpful when you need to prime a breaker with stats
+  * @param {Object} options -
+  * @param {Number} options.rollingCountBuckets number of buckets in the window
+  * @param {Number} options.rollingCountTimeout the duration of the window
+  * @param {Boolean} options.rollingPercentilesEnabled whether to calculate
+  * @param {Object} options.stats user supplied stats
+  * @returns {Status} a new {@link Status} object
+  */
+  static newStatus(options) {
+    return new Status(options);
+  }
+
   constructor (action, options = {}) {
@@ -143,3 +159,16 @@ super();
     this[WARMING_UP] = options.allowWarmUp === true;
-    this[STATUS] = new Status(this.options);
+
+    // The user can pass in a Status object to inialize the Status/stats
+    if (this.options.status) {
+      // Do a check that this is a Status Object,
+      if (this.options.status instanceof Status) {
+        this[STATUS] = this.options.status;
+      } else {
+        // should it error if it is not a Status Object
+        throw new TypeError('Not a Status Object.  The status option must be an instance of Status');
+      }
+    } else {
+      this[STATUS] = new Status(this.options);
+    }
+
     this[STATE] = CLOSED;
@@ -146,0 +175,0 @@ this[FALLBACK_FUNCTION] = null;

lib/status.js

@@ -35,2 +35,3 @@ 'use strict';
  * percentiles
+ * @param {Object} options.stats object of previous stats
  * @example
@@ -55,4 +56,4 @@ * // Creates a 1 second window consisting of ten time slices,
     // Set up our statistical rolling window
-    this[BUCKETS] = options.rollingCountBuckets;
-    this[TIMEOUT] = options.rollingCountTimeout;
+    this[BUCKETS] = options.rollingCountBuckets || 10;
+    this[TIMEOUT] = options.rollingCountTimeout || 10000;
     this[WINDOW] = new Array(this[BUCKETS]);
@@ -62,3 +63,4 @@ this[PERCENTILES] = [0.0, 0.25, 0.5, 0.75, 0.9, 0.95, 0.99, 0.995, 1];
     // Default this value to true
-    this.rollingPercentilesEnabled = options.rollingPercentilesEnabled;
+    this.rollingPercentilesEnabled
+      = options.rollingPercentilesEnabled !== false;
 
@@ -90,2 +92,6 @@ // prime the window with buckets
     }
+
+    if (options.stats) {
+      this[WINDOW][0] = { ...bucket(), ...options.stats };
+    }
   }
@@ -92,0 +98,0 @@

package.json

 {
   "name": "opossum",
-  "version": "6.0.1",
+  "version": "6.1.0",
   "author": "Red Hat, Inc.",
   "license": "Apache-2.0",
   "scripts": {
-    "prebuild": "npm run lint",
+    "prepare": "husky install",
+    "prebuild": "npm run pretest",
     "build": "./test/browser/generate-index.sh && npm run build:browser && npm run build:docs",
@@ -13,3 +14,3 @@ "build:browser": "webpack --config=config/webpack.config.js",
     "build:docs:markdown": "documentation build index.js -f md -o docs/opossum.md",
-    "pretest": "npm run lint",
+    "pretest": "eslint --ignore-path .gitignore .",
     "test": "nyc tape test/*.js | tap-spec",
@@ -52,2 +53,10 @@ "test:headless": "node test/browser/webpack-test.js",
     "documentation": "^13.1.1",
+    "eslint": "^7.24.0",
+    "eslint-config-semistandard": "^15.0.1",
+    "eslint-config-standard": "^16.0.2",
+    "eslint-plugin-import": "^2.22.1",
+    "eslint-plugin-node": "^11.1.0",
+    "eslint-plugin-promise": "^5.1.0",
+    "eslint-plugin-standard": "^5.0.0",
+    "husky": "^6.0.0",
     "nyc": "~15.1.0",
@@ -57,3 +66,2 @@ "opener": "1.5.2",
     "standard-version": "9.1.1",
-    "standardx": "^5.0.0",
     "tap-spec": "~5.0.0",
@@ -75,3 +83,3 @@ "tape": "~5.2.0",
   "engines": {
-    "node": "^15 || ^14 || ^12 || ^10"
+    "node": "^16 || ^14 || ^12 || ^10"
   },
@@ -78,0 +86,0 @@ "dependencies": {},

README.md

@@ -90,3 +90,53 @@ # opossum
 ```
+### Status Initialization
 
+There may be times where you will need to pre-populate the stats of the Circuit Breaker Status Object.  Primary use cases for this are in a serverless environment such as Knative or AWS Lambda, or any container based platform, where the container being deployed is ephemeral.
+
+Getting the existing cumalative stats for a breaker can be done like this:
+
+```
+const stats = breaker.stats;
+```
+
+`stats` will be an object that might look similar to this:
+
+```
+{
+  failures: 11,
+  fallbacks: 0,
+  successes: 5,
+  rejects: 0,
+  fires: 16,
+  timeouts: 0,
+  cacheHits: 0,
+  cacheMisses: 0,
+  semaphoreRejections: 0,
+  percentiles: {
+    '0': 0,
+    '1': 0,
+    '0.25': 0,
+    '0.5': 0,
+    '0.75': 0,
+    '0.9': 0,
+    '0.95': 0,
+    '0.99': 0,
+    '0.995': 0
+  },
+  latencyTimes: [ 0 ],
+  latencyMean: 0
+}
+```
+
+To then re-import those stats, first create a new `Status` object with the previous stats and then pass that as an option to the CircuitBreaker constructor:
+
+```
+const statusOptions = {
+  stats: {....}
+};
+
+const newStatus = CircuitBreaker.newStatus(statusOptions);
+
+const breaker = new CircuitBreaker({status: newStatus});
+```
+
 ### Browser
@@ -93,0 +143,0 @@

New alerts

License Policy Violation

License

This package is not allowed per your license policy. Review the package's license to ensure compliance.

Found 1 instance in 1 package

Fixed alerts

License Policy Violation

License

This package is not allowed per your license policy. Review the package's license to ensure compliance.

Found 1 instance in 1 package

Improved metrics

Total package byte prevSize

830756

increased by1.2%

Lines of code

4128

increased by1.75%

Number of lines in readme file

389

increased by14.75%

Worsened metrics

Dev dependency count

22

increased by46.67%

No dependency changes