log views: show event diffs by default, toggle to show the full event.

lib/eventApi.js

@@ -1,9 +1,11 @@
-var eventDb = require('./eventDb');
+var eventDb     = require('./eventDb');
+var eventDiffer = require('./eventDiffer');
 
 module.exports = function (app) {
 
     app.get('/events', function (req, res) {
         eventDb.getEvents().then(function (events) {
+            eventDiffer.addDiffs(events);
             res.json({events: events});
         });
     });
@@ -11,6 +13,7 @@ module.exports = function (app) {
     app.get('/events/:name', function (req, res) {
         eventDb.getEventsFilterByName(req.params.name).then(function (events) {
             if (events) {
+                eventDiffer.addDiffs(events);
                 res.json(events);
             } else {
                 res.status(404).json({error: 'Could not find events'});
@@ -18,5 +21,4 @@ module.exports = function (app) {
         });
     });
 
-
 };

lib/eventDiffer.js

@@ -0,0 +1,74 @@
+var eventType     = require('./eventType');
+var diff          = require('deep-diff').diff;
+
+var strategyTypes = [
+    eventType.strategyCreated,
+    eventType.strategyDeleted
+];
+
+var featureTypes  = [
+    eventType.featureCreated,
+    eventType.featureUpdated,
+    eventType.featureArchive,
+    eventType.featureRevive
+];
+
+function baseTypeFor(event) {
+    if (featureTypes.indexOf(event.type) !== -1) {
+        return 'features';
+    } else if (strategyTypes.indexOf(event.type) !== -1) {
+        return 'strategies';
+    } else {
+        throw new Error('unknown event type: ' + JSON.stringify(event));
+    }
+}
+
+function groupByBaseTypeAndName(events) {
+    var groups = {};
+
+    events.forEach(function (event) {
+        var baseType = baseTypeFor(event);
+
+        groups[baseType] = groups[baseType] || {};
+        groups[baseType][event.data.name] = groups[baseType][event.data.name] || [];
+
+        groups[baseType][event.data.name].push(event);
+    });
+
+    return groups;
+}
+
+function eachConsecutiveEvent(events, callback) {
+    var groups = groupByBaseTypeAndName(events);
+
+    Object.keys(groups).forEach(function (baseType) {
+        var group = groups[baseType];
+
+        Object.keys(group).forEach(function (name) {
+            var events = group[name];
+            var left, right, i, l;
+            for (i = 0, l = events.length; i < l; i++) {
+                left  = events[i];
+                right = events[i + 1];
+
+                callback(left, right);
+            }
+        });
+    });
+}
+
+function addDiffs(events) {
+    eachConsecutiveEvent(events, function (left, right) {
+        if (right) {
+            left.diffs = diff(right.data, left.data);
+            left.diffs = left.diffs || [];
+        } else {
+            left.diffs = null;
+        }
+    });
+}
+
+
+module.exports = {
+    addDiffs: addDiffs
+};

package.json

@@ -36,6 +36,7 @@
         "bluebird": "2.6.2",
         "body-parser": "1.10.1",
         "db-migrate": "0.7.1",
+        "deep-diff": "^0.3.0",
         "errorhandler": "1.3.2",
         "express": "4.9.8",
         "express-validator": "2.8.0",

public/css/unleash.css

@@ -22,4 +22,16 @@
 code {
     word-wrap: break-word;
     white-space: pre;
+}
+
+code > .diff-N {
+    color: green;
+}
+
+code > .diff-D {
+    color: red;
+}
+
+code > .diff-A, .diff-E {
+    color: black;
 }

public/js/components/log/LogEntry.jsx

@@ -1,5 +1,19 @@
 var React = require('react');
 
+var DIFF_PREFIXES = {
+    A: ' ',
+    E: ' ',
+    D: '-',
+    N: '+'
+}
+
+var SPADEN_CLASS = {
+    A: 'blue', // array edited
+    E: 'blue', // edited
+    D: 'negative', // deleted
+    N: 'positive', // added
+}
+
 var LogEntry = React.createClass({
     propTypes: {
         event: React.PropTypes.object.isRequired
@@ -7,25 +21,64 @@ var LogEntry = React.createClass({
 
     render: function() {
         var d = new Date(this.props.event.createdAt);
+
+        return (
+            <tr>
+            <td>
+            {d.getDate() + "." + (d.getMonth() + 1) + "." + d.getFullYear()}<br />
+            kl. {d.getHours() + "." + d.getMinutes()}
+            </td>
+            <td>
+            <strong>{this.props.event.data.name}</strong><em>[{this.props.event.type}]</em>
+            </td>
+            <td style={{maxWidth: 300}}>
+              {this.renderEventDiff()}
+            </td>
+            <td>{this.props.event.createdBy}</td>
+            </tr>
+        );
+    },
+
+    renderFullEventData: function() {
         var localEventData = JSON.parse(JSON.stringify(this.props.event.data));
         delete localEventData.description;
         delete localEventData.name;
-        return (
-            <tr>
-                <td>
-                    {d.getDate() + "." + d.getMonth() + "." + d.getFullYear()}<br />
-                    kl. {d.getHours() + "." + d.getMinutes()}
-                </td>
-                <td>
-                    <strong>{this.props.event.data.name}</strong><em>[{this.props.event.type}]</em>
-                </td>
-                <td style={{maxWidth: 300}}>
-                    <code className='JSON smalltext man'>{JSON.stringify(localEventData, null, 2)}</code>
-                </td>
-                <td>{this.props.event.createdBy}</td>
-            </tr>
-        );
+
+        var prettyPrinted = JSON.stringify(localEventData, null, 2);
+
+        return (<code className='JSON smalltext man'>{prettyPrinted}</code>)
+    },
+
+    renderEventDiff: function() {
+        if (!this.props.showFullEvents && this.props.event.diffs) {
+            var changes = this.props.event.diffs.map(this.buildDiff);
+            return (<code className='smalltext man'>{changes.length === 0 ? '(no changes)' : changes}</code>)
+        } else {
+            return this.renderFullEventData();
+        }
+    },
+
+    buildDiff: function(diff, idx) {
+        var change;
+        var key = diff.path.join('.');
+
+        if (diff.lhs !== undefined && diff.rhs !== undefined) {
+            change = (
+                <div>
+                  <div className={SPADEN_CLASS.D}>- {key}: {JSON.stringify(diff.lhs)}</div>
+                  <div className={SPADEN_CLASS.N}>+ {key}: {JSON.stringify(diff.rhs)}</div>
+                </div>
+            );
+        } else {
+            var spadenClass = SPADEN_CLASS[diff.kind]
+            var prefix      = DIFF_PREFIXES[diff.kind];
+
+            change = (<div className={spadenClass}>{prefix} {key}: {JSON.stringify(diff.rhs)}</div>)
+        }
+
+        return (<div key={idx}>{change}</div>)
     }
+
 });
 
 module.exports = LogEntry;

public/js/components/log/LogEntryList.jsx

@@ -6,18 +6,32 @@ var LogEntryList = React.createClass({
         events: React.PropTypes.array.isRequired
     },
 
+    getInitialState: function() {
+        return {
+            showFullEvents: false
+        }
+    },
+
     render: function() {
         var logEntryNodes = this.props.events.map(function(event) {
-            return <LogEntry event={event} key={event.name} />;
-        });
+            return <LogEntry event={event} key={event.id} showFullEvents={this.state.showFullEvents} />;
+        }.bind(this));
+
         return (
-            <div className=''>
+            <div>
+               <label className="prs fright-ht768 smalltext">
+                 Show full events
+                 <input type="checkbox" className="mlm" value={this.state.fullEvents} onChange={this.toggleFullEvents}></input>
+                </label>
+
                 <table className='outerborder zebra-striped'>
                     <thead>
                         <tr>
                             <th>When</th>
                             <th>Action</th>
-                            <th>Data</th>
+                            <th>
+                              Data
+                            </th>
                             <th>Author</th>
                         </tr>
                     </thead>
@@ -27,7 +41,12 @@ var LogEntryList = React.createClass({
                 </table>
             </div>
             );
+    },
+
+    toggleFullEvents: function(e) {
+        this.setState({showFullEvents: !this.state.showFullEvents});
     }
+
 });
 
 module.exports = LogEntryList;

test/eventDifferTest.js

@@ -0,0 +1,97 @@
+var eventDiffer = require('../lib/eventDiffer');
+var eventType   = require('../lib/eventType');
+var assert      = require('assert');
+
+describe('eventDiffer', function () {
+    it('fails if events include an unknown event type', function () {
+        var events = [
+            {type: eventType.featureCreated, data: {}},
+            {type: 'unknown-type', data: {}}
+        ];
+
+        assert.throws(function () {
+            eventDiffer.addDiffs(events);
+        });
+    });
+
+    it('diffs a feature-update event', function () {
+        var name = 'foo';
+        var desc = 'bar';
+
+        var events = [
+            {
+                type: eventType.featureUpdated,
+                data: {name: name, description: desc, strategy: 'default', enabled: true, parameters: {value: 2 }}
+            },
+            {
+                type: eventType.featureCreated,
+                data: {name: name, description: desc, strategy: 'default', enabled: false, parameters: {value: 1}}
+            }
+        ];
+
+        eventDiffer.addDiffs(events);
+
+        assert.deepEqual(events[0].diffs, [
+            {kind: 'E', path: ["enabled"], lhs: false, rhs: true},
+            {kind: 'E', path: ["parameters", "value"], lhs: 1, rhs: 2}
+        ]);
+
+        assert.strictEqual(events[1].diffs, null);
+    });
+
+    it('diffs only against features with the same name', function () {
+        var events = [
+            {
+                type: eventType.featureUpdated,
+                data: {name: 'bar', description: 'desc', strategy: 'default', enabled: true, parameters: {}}
+            },
+            {
+                type: eventType.featureUpdated,
+                data: {name: 'foo', description: 'desc', strategy: 'default', enabled: false, parameters: {}}
+            },
+            {
+                type: eventType.featureCreated,
+                data: {name: 'bar', description: 'desc', strategy: 'default', enabled: false, parameters: {}}
+            },
+            {
+                type: eventType.featureCreated,
+                data: {name: 'foo', description: 'desc', strategy: 'default', enabled: true, parameters: {}}
+            }
+        ];
+
+        eventDiffer.addDiffs(events);
+
+        assert.strictEqual(events[0].diffs[0].rhs, true);
+        assert.strictEqual(events[1].diffs[0].rhs, false);
+        assert.strictEqual(events[2].diffs, null);
+        assert.strictEqual(events[3].diffs, null);
+    });
+
+    it('sets an empty array of diffs if nothing was changed', function () {
+        var events = [
+            {
+                type: eventType.featureUpdated,
+                data: {name: 'foo', description: 'desc', strategy: 'default', enabled: true, parameters: {}}
+            },
+            {
+                type: eventType.featureCreated,
+                data: {name: 'foo', description: 'desc', strategy: 'default', enabled: true, parameters: {}}
+            }
+        ];
+
+        eventDiffer.addDiffs(events);
+        assert.deepEqual(events[0].diffs, []);
+    });
+
+    it('sets diffs to null if there was nothing to diff against', function () {
+        var events = [
+            {
+                type: eventType.featureUpdated,
+                data: {name: 'foo', description: 'desc', strategy: 'default', enabled: true, parameters: {}}
+            }
+        ];
+
+        eventDiffer.addDiffs(events);
+        assert.strictEqual(events[0].diffs, null);
+    });
+});