refactor: move server logic to own file

Author: johanbook

src/index.js

@@ -1,78 +1,3 @@
-const fs = require("node:fs");
-const http = require("node:http");
-const path = require("node:path");
+const { createServer } = require("./server");
 
-const mime = require("mime");
-
-const logger = require("./logger");
-
-const DEFAULT_INDEX_FILE = process.env.DEFAULT_INDEX_FILE || "index.html";
-const FALLBACK_FILE = process.env.FALLBACK_FILE || null;
-const PORT = process.env.PORT || 8080;
-const ROOT_FILE_PATH = process.env.ROOT_FILE_PATH || "build";
-
-function getFile(filePath) {
-  try {
-    const file = fs.readFileSync(filePath);
-    return file;
-  } catch {
-    logger.error(`Could not find file "${filePath}"`);
-    return;
-  }
-}
-
-function getFileMime(filePath) {
-  return mime.getType(filePath);
-}
-
-function getDomainFromRequest(req) {
-  const headers = req.headers;
-  const host = headers.host;
-  const domain = host.split(":")[0];
-  return domain;
-}
-
-function getFilePathFromRequest(req) {
-  return req.url.split("?")[0];
-}
-
-function createFilePath(domain, filePath) {
-  if (filePath === "/") {
-    filePath = DEFAULT_INDEX_FILE;
-  }
-  return path.join(ROOT_FILE_PATH, domain, filePath);
-}
-
-function handleRequest(req, res) {
-  const domain = getDomainFromRequest(req);
-  const filePath = getFilePathFromRequest(req);
-  logger.debug(`Requesting ${domain}${filePath}`);
-
-  const actualFilePath = createFilePath(domain, filePath);
-  let file = getFile(actualFilePath);
-
-  if (!file && FALLBACK_FILE) {
-    const fallbackFilePath = createFilePath(domain, FALLBACK_FILE);
-    logger.debug(`Serving fallback file: ${fallbackFilePath}`);
-    file = getFile(fallbackFilePath);
-  }
-
-  if (!file) {
-    res.writeHead(404);
-    res.end();
-    logger.accessLog(req, res);
-    return;
-  }
-
-  const mimeType = getFileMime(actualFilePath);
-
-  res.setHeader("Content-Type", mimeType);
-  res.writeHead(200);
-  res.end(file);
-  logger.accessLog(req, res);
-}
-
-const server = http.createServer(handleRequest);
-server.listen(PORT);
-
-logger.info(`Listening on port ${PORT}`);
+createServer();

src/server.js

@@ -0,0 +1,81 @@
+const fs = require("node:fs");
+const http = require("node:http");
+const path = require("node:path");
+
+const mime = require("mime");
+
+const logger = require("./logger");
+
+const DEFAULT_INDEX_FILE = process.env.DEFAULT_INDEX_FILE || "index.html";
+const FALLBACK_FILE = process.env.FALLBACK_FILE || null;
+const PORT = process.env.PORT || 8080;
+const ROOT_FILE_PATH = process.env.ROOT_FILE_PATH || "build";
+
+function getFile(filePath) {
+  try {
+    const file = fs.readFileSync(filePath);
+    return file;
+  } catch {
+    logger.error(`Could not find file "${filePath}"`);
+    return;
+  }
+}
+
+function getFileMime(filePath) {
+  return mime.getType(filePath);
+}
+
+function getDomainFromRequest(req) {
+  const headers = req.headers;
+  const host = headers.host;
+  const domain = host.split(":")[0];
+  return domain;
+}
+
+function getFilePathFromRequest(req) {
+  return req.url.split("?")[0];
+}
+
+function createFilePath(domain, filePath) {
+  if (filePath === "/") {
+    filePath = DEFAULT_INDEX_FILE;
+  }
+  return path.join(ROOT_FILE_PATH, domain, filePath);
+}
+
+function handleRequest(req, res) {
+  const domain = getDomainFromRequest(req);
+  const filePath = getFilePathFromRequest(req);
+  logger.debug(`Requesting ${domain}${filePath}`);
+
+  const actualFilePath = createFilePath(domain, filePath);
+  let file = getFile(actualFilePath);
+
+  if (!file && FALLBACK_FILE) {
+    const fallbackFilePath = createFilePath(domain, FALLBACK_FILE);
+    logger.debug(`Serving fallback file: ${fallbackFilePath}`);
+    file = getFile(fallbackFilePath);
+  }
+
+  if (!file) {
+    res.writeHead(404);
+    res.end();
+    logger.accessLog(req, res);
+    return;
+  }
+
+  const mimeType = getFileMime(actualFilePath);
+
+  res.setHeader("Content-Type", mimeType);
+  res.writeHead(200);
+  res.end(file);
+  logger.accessLog(req, res);
+}
+
+exports.createServer = function (port = PORT) {
+  const server = http.createServer(handleRequest);
+  server.listen(port);
+
+  logger.info(`Listening on port ${port}`);
+  return server;
+};