Roughing out the demo app

node_modules/json-server/lib/cli/run.js

@@ -0,0 +1,233 @@
+"use strict";
+
+const fs = require('fs');
+
+const path = require('path');
+
+const jph = require('json-parse-helpfulerror');
+
+const _ = require('lodash');
+
+const chalk = require('chalk');
+
+const enableDestroy = require('server-destroy');
+
+const pause = require('connect-pause');
+
+const is = require('./utils/is');
+
+const load = require('./utils/load');
+
+const jsonServer = require('../server');
+
+function prettyPrint(argv, object, rules) {
+  const root = `http://${argv.host}:${argv.port}`;
+  console.log();
+  console.log(chalk.bold('  Resources'));
+
+  for (const prop in object) {
+    console.log(`  ${root}/${prop}`);
+  }
+
+  if (rules) {
+    console.log();
+    console.log(chalk.bold('  Other routes'));
+
+    for (var rule in rules) {
+      console.log(`  ${rule} -> ${rules[rule]}`);
+    }
+  }
+
+  console.log();
+  console.log(chalk.bold('  Home'));
+  console.log(`  ${root}`);
+  console.log();
+}
+
+function createApp(db, routes, middlewares, argv) {
+  const app = jsonServer.create();
+  const {
+    foreignKeySuffix
+  } = argv;
+  const router = jsonServer.router(db, foreignKeySuffix ? {
+    foreignKeySuffix
+  } : undefined);
+  const defaultsOpts = {
+    logger: !argv.quiet,
+    readOnly: argv.readOnly,
+    noCors: argv.noCors,
+    noGzip: argv.noGzip,
+    bodyParser: true
+  };
+
+  if (argv.static) {
+    defaultsOpts.static = path.join(process.cwd(), argv.static);
+  }
+
+  const defaults = jsonServer.defaults(defaultsOpts);
+  app.use(defaults);
+
+  if (routes) {
+    const rewriter = jsonServer.rewriter(routes);
+    app.use(rewriter);
+  }
+
+  if (middlewares) {
+    app.use(middlewares);
+  }
+
+  if (argv.delay) {
+    app.use(pause(argv.delay));
+  }
+
+  router.db._.id = argv.id;
+  app.db = router.db;
+  app.use(router);
+  return app;
+}
+
+module.exports = function (argv) {
+  const source = argv._[0];
+  let app;
+  let server;
+
+  if (!fs.existsSync(argv.snapshots)) {
+    console.log(`Error: snapshots directory ${argv.snapshots} doesn't exist`);
+    process.exit(1);
+  } // noop log fn
+
+
+  if (argv.quiet) {
+    console.log = () => {};
+  }
+
+  console.log();
+  console.log(chalk.cyan('  \\{^_^}/ hi!'));
+
+  function start(cb) {
+    console.log();
+    console.log(chalk.gray('  Loading', source));
+    server = undefined; // create db and load object, JSON file, JS or HTTP database
+
+    return load(source).then(db => {
+      // Load additional routes
+      let routes;
+
+      if (argv.routes) {
+        console.log(chalk.gray('  Loading', argv.routes));
+        routes = JSON.parse(fs.readFileSync(argv.routes));
+      } // Load middlewares
+
+
+      let middlewares;
+
+      if (argv.middlewares) {
+        middlewares = argv.middlewares.map(function (m) {
+          console.log(chalk.gray('  Loading', m));
+          return require(path.resolve(m));
+        });
+      } // Done
+
+
+      console.log(chalk.gray('  Done')); // Create app and server
+
+      app = createApp(db, routes, middlewares, argv);
+      server = app.listen(argv.port, argv.host); // Enhance with a destroy function
+
+      enableDestroy(server); // Display server informations
+
+      prettyPrint(argv, db.getState(), routes); // Catch and handle any error occurring in the server process
+
+      process.on('uncaughtException', error => {
+        if (error.errno === 'EADDRINUSE') console.log(chalk.red(`Cannot bind to the port ${error.port}. Please specify another port number either through --port argument or through the json-server.json configuration file`));else console.log('Some error occurred', error);
+        process.exit(1);
+      });
+    });
+  } // Start server
+
+
+  start().then(() => {
+    // Snapshot
+    console.log(chalk.gray('  Type s + enter at any time to create a snapshot of the database')); // Support nohup
+    // https://github.com/typicode/json-server/issues/221
+
+    process.stdin.on('error', () => {
+      console.log(`  Error, can't read from stdin`);
+      console.log(`  Creating a snapshot from the CLI won't be possible`);
+    });
+    process.stdin.setEncoding('utf8');
+    process.stdin.on('data', chunk => {
+      if (chunk.trim().toLowerCase() === 's') {
+        const filename = `db-${Date.now()}.json`;
+        const file = path.join(argv.snapshots, filename);
+        const state = app.db.getState();
+        fs.writeFileSync(file, JSON.stringify(state, null, 2), 'utf-8');
+        console.log(`  Saved snapshot to ${path.relative(process.cwd(), file)}\n`);
+      }
+    }); // Watch files
+
+    if (argv.watch) {
+      console.log(chalk.gray('  Watching...'));
+      console.log();
+      const source = argv._[0]; // Can't watch URL
+
+      if (is.URL(source)) throw new Error("Can't watch URL"); // Watch .js or .json file
+      // Since lowdb uses atomic writing, directory is watched instead of file
+
+      const watchedDir = path.dirname(source);
+      let readError = false;
+      fs.watch(watchedDir, (event, file) => {
+        // https://github.com/typicode/json-server/issues/420
+        // file can be null
+        if (file) {
+          const watchedFile = path.resolve(watchedDir, file);
+
+          if (watchedFile === path.resolve(source)) {
+            if (is.FILE(watchedFile)) {
+              let obj;
+
+              try {
+                obj = jph.parse(fs.readFileSync(watchedFile));
+
+                if (readError) {
+                  console.log(chalk.green(`  Read error has been fixed :)`));
+                  readError = false;
+                }
+              } catch (e) {
+                readError = true;
+                console.log(chalk.red(`  Error reading ${watchedFile}`));
+                console.error(e.message);
+                return;
+              } // Compare .json file content with in memory database
+
+
+              const isDatabaseDifferent = !_.isEqual(obj, app.db.getState());
+
+              if (isDatabaseDifferent) {
+                console.log(chalk.gray(`  ${source} has changed, reloading...`));
+                server && server.destroy(() => start());
+              }
+            }
+          }
+        }
+      }); // Watch routes
+
+      if (argv.routes) {
+        const watchedDir = path.dirname(argv.routes);
+        fs.watch(watchedDir, (event, file) => {
+          if (file) {
+            const watchedFile = path.resolve(watchedDir, file);
+
+            if (watchedFile === path.resolve(argv.routes)) {
+              console.log(chalk.gray(`  ${argv.routes} has changed, reloading...`));
+              server && server.destroy(() => start());
+            }
+          }
+        });
+      }
+    }
+  }).catch(err => {
+    console.log(err);
+    process.exit(1);
+  });
+};