Merge pull request #2 from platform9/nodejs-function-run-container

NodeJS Function Run Container

src/function-run/nodejs/Dockerfile

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+# A docker image for the func container.
+
+FROM node:4-onbuild
+
+ADD server.js /usr/src/app/server.js
+
+EXPOSE 8888

src/function-run/nodejs/package.json

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+{
+    "name": "fission-nodejs-runtime",
+    "version": "0.0.0",
+    "author": "Soam Vasani",
+    "contributors": [
+        {
+            "name": "Soam Vasani",
+            "email": "soamvasani@platform9.com"
+        }
+    ],
+    "description": "NodeJS run container for the fission framework",
+    "engines": {
+        "node": ">=4.2.2"
+    },
+    "dependencies": {
+        "express": "",
+        "minimist": "",
+        "body-parser": ""
+    }
+}

src/function-run/nodejs/server.js

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+'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);

src/function-run/nodejs/test/test.js

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+module.exports = function (context, callback) {
+  console.log("Test function entered");
+  callback(200, "Hello, world!\n");
+  console.log("Test function exit");
+}

src/function-run/nodejs/test/test.sh

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+#!/bin/sh
+
+# TODO placeholder until we have better tests :)
+
+set +x
+set -e
+
+DIR=$(dirname $0)
+
+echo "-- Starting server"
+node $DIR/../server.js --codepath $DIR/test.js --port 8888 &
+function cleanup() {
+    echo "-- Cleanup"
+    kill %1
+}
+trap cleanup EXIT
+sleep 2
+
+echo "-- Specializing"
+curl -f -X POST http://localhost:8888/specialize
+
+echo "-- Running user function"
+curl -f -X GET http://localhost:8888
+curl -f -X POST http://localhost:8888
+curl -f -X PUT http://localhost:8888
+curl -f -X DELETE http://localhost:8888
+curl -f -X TRACE http://localhost:8888
+curl -f -X OPTIONS http://localhost:8888
+
+# -I causes curl to make a HEAD request.
+curl -f -I http://localhost:8888