fix: retry and throttle GitHub API requests

Closes #35.

package.json

@@ -22,6 +22,8 @@
   "dependencies": {
     "@actions/core": "^1.10.0",
     "@actions/github": "^5.1.1",
+    "@octokit/plugin-throttling": "^5.2.3",
+    "@octokit/plugin-retry": "^4.1.6",
     "joi": "^17.9.2"
   },
   "devDependencies": {

src/index.js

@@ -2,11 +2,12 @@ const core = require('@actions/core');
 const github = require('@actions/github');
 
 const schema = require('./schema');
+const {getClient} = require('./utils');
 
 async function run() {
   try {
     const config = getConfig();
-    const client = github.getOctokit(config['github-token']);
+    const client = getClient(config['github-token']);
 
     const app = new App(config, client);
     await app.lockThreads();

src/utils.js

@@ -0,0 +1,36 @@
+const core = require('@actions/core');
+const github = require('@actions/github');
+const {retry} = require('@octokit/plugin-retry');
+const {throttling} = require('@octokit/plugin-throttling');
+
+function getClient(token) {
+  const rateLimitRetries = 3;
+
+  const rateLimitCallback = function (
+    retryAfter,
+    options,
+    octokit,
+    retryCount
+  ) {
+    core.info(
+      `Request quota exhausted for request ${options.method} ${options.url}`
+    );
+
+    if (retryCount < rateLimitRetries) {
+      core.info(`Retrying after ${retryAfter} seconds`);
+
+      return true;
+    }
+  };
+
+  const options = {
+    throttle: {
+      onSecondaryRateLimit: rateLimitCallback,
+      onRateLimit: rateLimitCallback
+    }
+  };
+
+  return github.getOctokit(token, options, retry, throttling);
+}
+
+module.exports = {getClient};