Improvements To Debug

Change the call signature, leverage built-in formatting on console. Move debug enablement checks to file load.
Replaces #363
Resolves #362

Co-Author Nirmal Patel <nirmal259907@gmail.com>

Author: chris-pardy

src/almanac.js

@@ -106,7 +106,7 @@ export default class Almanac {
     } else {
       fact = new Fact(id, valueOrMethod, options)
     }
-    debug(`almanac::addFact id:${factId}`)
+    debug('almanac::addFact', { id: factId })
     this.factMap.set(factId, fact)
     if (fact.isConstant()) {
       this._setFactValue(fact, {}, fact.value)
@@ -121,7 +121,7 @@ export default class Almanac {
    * @param {Mixed} value - constant value of the fact
    */
   addRuntimeFact (factId, value) {
-    debug(`almanac::addRuntimeFact id:${factId}`)
+    debug('almanac::addRuntimeFact', { id: factId })
     const fact = new Fact(factId, value)
     return this._addConstantFact(fact)
   }
@@ -151,22 +151,22 @@ export default class Almanac {
       const cacheVal = cacheKey && this.factResultsCache.get(cacheKey)
       if (cacheVal) {
         factValuePromise = Promise.resolve(cacheVal)
-        debug(`almanac::factValue cache hit for fact:${factId}`)
+        debug('almanac::factValue cache hit for fact', { id: factId })
       } else {
-        debug(`almanac::factValue cache miss for fact:${factId}; calculating`)
+        debug('almanac::factValue cache miss, calculating', { id: factId })
         factValuePromise = this._setFactValue(fact, params, fact.calculate(params, this))
       }
     }
     if (path) {
-      debug(`condition::evaluate extracting object property ${path}`)
+      debug('condition::evaluate extracting object', { property: path })
       return factValuePromise
         .then(factValue => {
           if (isObjectLike(factValue)) {
             const pathValue = this.pathResolver(factValue, path)
-            debug(`condition::evaluate extracting object property ${path}, received: ${JSON.stringify(pathValue)}`)
+            debug('condition::evaluate extracting object', { property: path, received: pathValue })
             return pathValue
           } else {
-            debug(`condition::evaluate could not compute object path(${path}) of non-object: ${factValue} <${typeof factValue}>; continuing with ${factValue}`)
+            debug('condition::evaluate could not compute object path of non-object', { path, factValue, type: typeof factValue })
             return factValue
           }
         })

src/condition.js

@@ -101,9 +101,12 @@ export default class Condition {
     ]).then(([rightHandSideValue, leftHandSideValue]) => {
       const result = op.evaluate(leftHandSideValue, rightHandSideValue)
       debug(
-        `condition::evaluate <${JSON.stringify(leftHandSideValue)} ${
-          this.operator
-        } ${JSON.stringify(rightHandSideValue)}?> (${result})`
+        'condition::evaluate', {
+          leftHandSideValue,
+          operator: this.operator,
+          rightHandSideValue,
+          result
+        }
       )
       return {
         result,

src/debug.js

@@ -1,10 +1,14 @@
-export default function debug (message) {
+
+function createDebug () {
   try {
     if ((typeof process !== 'undefined' && process.env && process.env.DEBUG && process.env.DEBUG.match(/json-rules-engine/)) ||
         (typeof window !== 'undefined' && window.localStorage && window.localStorage.debug && window.localStorage.debug.match(/json-rules-engine/))) {
-      console.log(message)
+      return console.debug.bind(console)
     }
   } catch (ex) {
     // Do nothing
   }
+  return () => {}
 }
+
+export default createDebug()

src/engine.js

@@ -133,7 +133,7 @@ class Engine extends EventEmitter {
     } else {
       operator = new Operator(operatorOrName, cb)
     }
-    debug(`engine::addOperator name:${operator.name}`)
+    debug('engine::addOperator', { name: operator.name })
     this.operators.set(operator.name, operator)
   }
 
@@ -168,7 +168,7 @@ class Engine extends EventEmitter {
     } else {
       fact = new Fact(id, valueOrMethod, options)
     }
-    debug(`engine::addFact id:${factId}`)
+    debug('engine::addFact', { id: factId })
     this.facts.set(factId, fact)
     return this
   }
@@ -237,11 +237,11 @@ class Engine extends EventEmitter {
   evaluateRules (ruleArray, almanac) {
     return Promise.all(ruleArray.map((rule) => {
       if (this.status !== RUNNING) {
-        debug(`engine::run status:${this.status}; skipping remaining rules`)
+        debug('engine::run, skipping remaining rules', { status: this.status })
         return Promise.resolve()
       }
       return rule.evaluate(almanac).then((ruleResult) => {
-        debug(`engine::run ruleResult:${ruleResult.result}`)
+        debug('engine::run', { ruleResult: ruleResult.result })
         almanac.addResult(ruleResult)
         if (ruleResult.result) {
           almanac.addEvent(ruleResult.event, 'success')
@@ -282,7 +282,7 @@ class Engine extends EventEmitter {
       }
 
       almanac.addFact(fact)
-      debug(`engine::run initialized runtime fact:${fact.id} with ${fact.value}<${typeof fact.value}>`)
+      debug('engine::run initialized runtime fact', { id: fact.id, value: fact.value, type: typeof fact.value })
     }
     const orderedSets = this.prioritizeRules()
     let cursor = Promise.resolve()

src/rule.js

@@ -249,7 +249,7 @@ class Rule extends EventEmitter {
       return Promise.all(
         conditions.map((condition) => evaluateCondition(condition))
       ).then((conditionResults) => {
-        debug('rule::evaluateConditions results', conditionResults)
+        debug('rule::evaluateConditions', { results: conditionResults })
         return method.call(conditionResults, (result) => result === true)
       })
     }