♻️ Add helpers for uptime, config, octokit

Author: AnandChowdhary

src/helpers/calculate-uptime.ts

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+import { readFile } from "fs-extra";
+import { safeLoad } from "js-yaml";
+import { getOctokit } from "./github";
+import { join } from "path";
+import { SiteHistory } from "../interfaces";
+
+/**
+ * Get the number of seconds a website has been down
+ * @param slug - Slug of the site
+ */
+const getDowntimeSecondsForSite = async (slug: string): Promise<number> => {
+  let [owner, repo] = (process.env.GITHUB_REPOSITORY || "").split("/");
+  const octokit = await getOctokit();
+  let msDown = 0;
+
+  // Get all the issues for this website
+  const { data } = await octokit.issues.listForRepo({
+    owner,
+    repo,
+    labels: `status,${slug}`,
+    filter: "all",
+    per_page: 100,
+  });
+
+  // If this issue has been closed already, calculate the difference
+  // between when it was closed and when it was opened
+  // If this issue is still open, calculate the time since it was opened
+  data.forEach(
+    (issue) =>
+      (msDown +=
+        new Date(issue.closed_at || new Date()).getTime() - new Date(issue.created_at).getTime())
+  );
+
+  return Math.round(msDown / 1000);
+};
+
+/**
+ * Get the uptime percentage for a website
+ * @returns Percent string, e.g., 94.43%
+ * @param slug - Slug of the site
+ */
+export const getUptimePercentForSite = async (slug: string): Promise<string> => {
+  const site = safeLoad(await readFile(join(".", "history", `${slug}.yml`), "utf8")) as SiteHistory;
+  // Time when we started tracking this website's downtime
+  const startDate = new Date(site.startTime ?? new Date());
+
+  // Number of seconds we have been tracking this site
+  const totalSeconds = (new Date().getTime() - startDate.getTime()) / 1000;
+
+  // Number of seconds the site has been down
+  const downtimeSeconds = await getDowntimeSecondsForSite(slug);
+
+  // Return a percentage string
+  return `${((downtimeSeconds / totalSeconds) * 100).toFixed(2)}%`;
+};

src/helpers/config.ts

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+import { readFile } from "fs-extra";
+import { safeLoad } from "js-yaml";
+import { join } from "path";
+import { UpptimeConfig } from "../interfaces";
+
+let __config: UpptimeConfig | undefined = undefined;
+export const getConfig = async (): Promise<UpptimeConfig> => {
+  if (__config) return __config;
+  const config = safeLoad(await readFile(join(".", ".upptimerc.yml"), "utf8")) as UpptimeConfig;
+  __config = config;
+  return config;
+};

src/helpers/github.ts

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+import { Octokit } from "@octokit/rest";
+import { getConfig } from "./config";
+
+export const getOctokit = async (): Promise<Octokit> => {
+  const config = await getConfig();
+  return new Octokit({
+    auth: config.PAT || process.env.GH_PAT || process.env.GITHUB_TOKEN,
+    userAgent: config["user-agent"] || process.env.USER_AGENT || "KojBot",
+  });
+};