Move packages to root dir from src/

This is supposed to work slightly better with go import paths. I think.

function-run/nodejs/server.js

@@ -0,0 +1,74 @@
+'use strict';
+
+const fs = require('fs');
+const process = require('process');
+const express = require('express');
+const app = express();
+const bodyParser = require('body-parser');
+
+// Command line opts
+const argv = require('minimist')(process.argv.slice(1));
+if (!argv.codepath || !argv.port) {
+    console.error("Need --codepath and --port");
+    process.exit(1);
+}
+
+// User function.  Starts out undefined.
+let userFunction;
+
+//
+// Specialize this server to a given user function.  The user function
+// is read from argv.codepath; it's expected to be placed there by the
+// fission runtime.
+//
+function specialize(req, res) {
+    // Make sure we're a generic container.  (No reuse of containers.
+    // Once specialized, the container remains specialized.)
+    if (userFunction) {
+        res.status(400).send("Not a generic container");
+        return;
+    }
+
+    // Read and load the code. It's placed there securely by the fission runtime.
+    try {
+        var startTime = process.hrtime();
+        userFunction = require(argv.codepath);
+        var elapsed = process.hrtime(startTime);
+        console.log(`user code loaded in ${elapsed[0]}sec ${elapsed[1]/1000000}ms`);
+    } catch(e) {
+        console.error(`user code load error: ${e}`);
+        res.status(500).send(JSON.stringify(e));
+        return;
+    }
+    res.status(202).send();
+}
+
+
+app.use(bodyParser.json());
+app.post('/specialize', specialize);
+
+// Generic route -- all http requests go to the user function.
+app.all('/', function (req, res) {
+    if (!userFunction) {
+        res.status(500).send("Generic container: no requests supported");
+        return;
+    }
+    const context = {
+        request: req,
+        response: res
+        // TODO: context should also have: URL template params, query string, ...anything else?
+    };
+    function callback(status, body, headers) {
+        if (!status)
+            return;
+        if (headers) {
+            for (let name of Object.keys(headers)) {
+                res.set(name, headers[name]);
+            }
+        }
+        res.status(status).send(body);
+    }
+    userFunction(context, callback);
+});
+
+app.listen(argv.port);