Added a very complicated AsyncIterableReader class.

The class was already implemented in
"https://deno.land/std@0.144.0/streams/conversion.ts".  So, I litterally
lost 1 day of work!  I hate myself.

src/restapi.ts

@@ -2,7 +2,9 @@ import { Context, Router } from "https://deno.land/x/oak/mod.ts";
 import { FileService } from "./fileservice.ts";
 import { readerFromStreamReader } from "https://deno.land/std@0.189.0/streams/mod.ts";
 import { asyncIterableToArray } from "./utils.ts";
-
+import { StringReader } from "https://deno.land/std@0.178.0/io/string_reader.ts";
+import { isReader } from "https://deno.land/x/oak@v12.5.0/util.ts";
+import { createMockNext } from "https://deno.land/x/oak@v12.1.0/testing.ts";
 
 
 type Handler = (ctx: Context) => void;
@@ -30,10 +32,19 @@ function createFileHandlerFactory(fileService: FileService): Handler {
 
 
 function getFileHandlerFactory(fileService: FileService): Handler {
-    return (ctx: Context) => {
+    return async (ctx: Context) => {
         const untypedCtx: any = ctx;
         const fileId = untypedCtx.params.file_id;
-        // ctx.response.body = await fileService.getRawBodyByPath()
+        const reader = await fileService.getBodyAsReader(fileId);
+        if(reader == null){
+            ctx.response.status = 404;
+            return;
+        }
+        ctx.response.status = 200;
+        ctx.response.body = reader;
+        ctx.response.type = "text/plain";
+        // ctx.send(reader)
+
     };
 }