Add example for #394

examples/rot-specific-levels.js

@@ -0,0 +1,57 @@
+var bunyan = require('./'),
+    safeCycles = bunyan.safeCycles;
+var util = require('util');
+
+
+function SpecificLevelStream(levels, stream) {
+    var self = this;
+    this.levels = {};
+    levels.forEach(function (lvl) {
+        self.levels[bunyan.resolveLevel(lvl)] = true;
+    });
+    this.stream = stream;
+}
+SpecificLevelStream.prototype.write = function (rec) {
+    if (this.levels[rec.level] !== undefined) {
+        var str = JSON.stringify(rec, safeCycles()) + '\n';
+        this.stream.write(str);
+    }
+}
+
+
+var log = bunyan.createLogger({
+    name: 'rot-specific-levels',
+    streams: [
+        {
+            type: 'raw',
+            level: 'debug',
+            stream: new SpecificLevelStream(
+                ['debug'],
+                new bunyan.RotatingFileStream({
+                    path: './rot-specific-levels.debug.log',
+                    period: '3000ms',
+                    count: 10
+                })
+            )
+        },
+        {
+            type: 'raw',
+            level: 'info',
+            stream: new SpecificLevelStream(
+                ['info'],
+                new bunyan.RotatingFileStream({
+                    path: './rot-specific-levels.info.log',
+                    period: '3000ms',
+                    count: 10
+                })
+            )
+        }
+    ]
+});
+
+
+setInterval(function () {
+    log.trace('hi on trace')    // goes nowhere
+    log.debug('hi on debug')    // goes to rot-specific-levels.debug.log.*
+    log.info('hi on info')      // goes to rot-specific-levels.info.log.*
+}, 1000);