Bring back cache stuff to mitigate Wordnik API limits.

cached-named-levels-class.js

@@ -0,0 +1,40 @@
+var getNamedLevelsClass = require('./named-levels-class');
+var level = require('level');
+var callNextTick = require('call-next-tick');
+
+var db = level(__dirname + '/data/named-levels-classes.db', {
+  keyEncoding: 'json',
+  valueEncoding: 'json'
+});
+
+function cachedGetNamedLevelsClass(opts, done) {
+  db.get(opts, checkGet);
+
+  function checkGet(error, profile) {
+    if (error && error.type === 'NotFoundError') {
+      getNamedLevelsClass(opts, saveResult);
+    } else if (error) {
+      done(error);
+    } else {
+      done(error, profile);
+    }
+  }
+
+  function saveResult(error, profile) {
+    if (error) {
+      done(error);
+    } else {
+      db.put(opts, profile, passProfile);
+    }
+
+    function passProfile(error) {
+      if (error) {
+        done(error);
+      } else {
+        done(error, profile);
+      }
+    }
+  }
+}
+
+module.exports = cachedGetNamedLevelsClass;

namedlevels-api.js

@@ -1,7 +1,7 @@
 #!/usr/bin/env node
 
 var restify = require('restify');
-var getNamedLevelsClass = require('./named-levels-class');
+var getNamedLevelsClass = require('./cached-named-levels-class');
 var getRandomClassName = require('./get-random-class-name');
 
 function respond(req, res, next) {