index: generalize retrying and alias listing

lib/index.js

@@ -74,7 +74,7 @@ export default class Now extends EventEmitter {
     const nowProperties = pkg.now || {};
     const engines = nowProperties.engines || pkg.engines;
 
-    const deployment = await retry(async (bail) => {
+    const deployment = await this.retry(async (bail) => {
       if (this._debug) console.time('> [debug] /now/create');
       const res = await this._fetch('/now/create', {
         method: 'POST',
@@ -210,7 +210,7 @@ export default class Now extends EventEmitter {
   async list (app) {
     const query = app ? `?app=${encodeURIComponent(app)}` : '';
 
-    const { deployments } = await retry(async (bail) => {
+    const { deployments } = await this.retry(async (bail) => {
       if (this._debug) console.time('> [debug] /list');
       const res = await this._fetch('/now/list' + query);
       if (this._debug) console.timeEnd('> [debug] /list');
@@ -233,10 +233,20 @@ export default class Now extends EventEmitter {
     return deployments;
   }
 
+  async listAliases (deploymentId) {
+    return this.retry(async (bail, attempt) => {
+      const res = await this._fetch(deploymentId
+        ? `/now/deployments/${deploymentId}/aliases`
+        : '/now/aliases');
+      const body = await res.json();
+      return body.aliases;
+    });
+  }
+
   async remove (deploymentId, { hard }) {
     const data = { deploymentId, hard };
 
-    await retry(async (bail) => {
+    await this.retry(async (bail) => {
       if (this._debug) console.time('> [debug] /remove');
       const res = await this._fetch('/now/remove', {
         method: 'DELETE',
@@ -255,11 +265,19 @@ export default class Now extends EventEmitter {
       if (200 !== res.status) {
         throw new Error('Removing deployment failed');
       }
-    }, { retries: 3, minTimeout: 2500, onRetry: this._onRetry });
+    });
 
     return true;
   }
 
+  retry (fn) {
+    return retry(fn, {
+      retries: 5,
+      randomize: true,
+      onRetry: this._onRetry
+    });
+  }
+
   _onRetry (err) {
     if (this._debug) {
       console.log(`> [debug] Retrying: ${err.stack}`);