Better caching

Now saves all hashes,links to persistent csv file
Now clears temporary files from disk after uploading to imgur and saving cache

.gitignore

@@ -29,3 +29,5 @@ build/Release
 node_modules
 
 target
+
+cache.csv

cache.js

@@ -0,0 +1,34 @@
+import fs from 'fs';
+import {parse} from 'csv';
+import {promisify} from 'bluebird';
+
+let parseAsync = promisify(parse);
+
+export class Cache {
+    constructor(file) {
+        this.file = file;
+        this.cache = new Map();
+    }
+
+    static fromCsvFile(file) {
+        let cacheInstance = new Cache(file);
+        fs.readFileAsync('cache.csv', {flag: 'a+'})
+            .then(parseAsync)
+            .then(parsed => {
+                debugger;
+                cacheInstance.cache = parsed.reduce((map, row) => map.set(row[0], row[1]), new Map());
+                return Promise.resolve();
+            })
+            .then(() => console.log('Cache is ready!'));
+        return cacheInstance;
+    }
+
+    get(hash) {
+        return this.cache.get(hash);
+    }
+
+    set(hash, link) {
+        this.cache.set(hash, link);
+        return fs.appendFileAsync(this.file, hash+","+link+"\n")
+    }
+}

package.json

@@ -12,6 +12,7 @@
     "babel": "^5.5.8",
     "bluebird": "^2.9.30",
     "body-parser": "^1.13.0",
+    "csv": "^0.4.5",
     "del": "^1.2.0",
     "express": "^4.12.4",
     "gm": "^1.18.1",

realIndex.js

@@ -11,6 +11,8 @@ import fs from 'fs';
 import url from 'url';
 import crypto from 'crypto';
 
+import {Cache} from './cache';
+
 let delAsync = Promise.promisify(del);
 
 let app = express();
@@ -20,12 +22,16 @@ Promise.promisifyAll(fs);
 Promise.promisifyAll(gm.prototype);
 
 let targetDir = process.env.CAPTION_MAKER_TARGET_DIR || "target";
-let cache = new Map();
+let cache = Cache.fromCsvFile('cache.csv');
 
 app.use(json());
 app.use(urlencoded({extended: false}));
 app.post('/', async function handlePost(req, res) {
     console.log(req.body);
+
+    req.body.top = req.body.top.toUpperCase();
+    req.body.bottom = req.body.bottom.toUpperCase();
+
     let sha = sha1(JSON.stringify(req.body));
     console.log("SHA1:", sha);
     if (cache.get(sha)) {
@@ -41,6 +47,8 @@ app.post('/', async function handlePost(req, res) {
     let json = await imgur.uploadFile(`${location}/output`);
     console.log("Done. Imgur link", json.data.link, "Adding to cache");
     cache.set(sha, json.data.link);
+    console.log("Removing from filesystem");
+    await delAsync(location);
     res.end(json.data.link);
 });