feat: add proxy

src/cli.ts

@@ -0,0 +1,65 @@
+import {execSync} from 'child_process';
+import * as config from 'config';
+import * as Dockerode from 'dockerode';
+import {readFile, writeFileSync} from 'fs-extra';
+import {render} from 'mustache';
+import {ConfigFile, logger} from './common';
+import {getContainers, getTemplateView} from './main';
+
+// handle unhandled promise rejections
+process.on('unhandledRejection', (error: Error) => {
+  logger.error(error.message);
+  logger.info(error.stack);
+  process.exit(1);
+});
+
+let containerHashCache = '';
+const configFile: ConfigFile = config.util.toObject();
+
+/**
+ * Reads the container information from the docker socket and updates
+ * the nginx config if necessary
+ * 
+ * The function will call itself again every 10s
+ */
+async function updateNginxConfig() {
+
+  const containers = await getContainers();
+
+  const containerHash = containers.map((container: Dockerode.ContainerInfo) => {
+    return container.Id;
+  }).join(',');
+
+  // if containers changed -> write config file, reload nginx
+  if (containerHash !== containerHashCache) {
+    logger.log('docker container changed');
+    logger.log('Generating new NGINX configuration');
+
+    // render nginx config file
+    const nginxConfig = render(await readFile('nginx.conf.template', 'utf8'), await getTemplateView(containers));
+
+    logger.log(`containers (${containerHash}) matched the configuration.`);
+
+    containerHashCache = containerHash;
+
+    logger.log(`Writing new config file "${configFile.output}"`);
+    // overwrite nginx config file with our rendered one
+    writeFileSync(configFile.output, nginxConfig, 'utf8');
+
+    logger.log('Executing "nginx -s reload" to tell nginx to reload the configuration file');
+    execSync('nginx -s reload');
+  }
+}
+
+function forever() {
+  // start the process of dynamic nginx configuration
+  updateNginxConfig().then(() => {
+    // check for changes again in 10 seconds
+    setTimeout(forever, 10000);
+  }).catch((err) => {
+    throw err;
+  });
+}
+
+// start the process that checks the docker socket periodically
+forever();