refactor!: Move all Octokit code to own file

Separation of concerns. We want to completely separate the internals of
Octokit from this application, so move any reference/call to Octokit into
its own file to symbolize that.

src/OctokitWrapper.ts

@@ -0,0 +1,62 @@
+import * as core from "@actions/core"
+import * as github from "@actions/github"
+import { GitHub } from "@actions/github/lib/utils"
+
+import { nextflow_release, NextflowRelease } from "./NextflowRelease"
+
+const NEXTFLOW_REPO = { owner: "nextflow-io", repo: "nextflow" }
+
+export async function setup_octokit(
+  github_token: string
+): Promise<InstanceType<typeof GitHub>> {
+  let octokit = {} as InstanceType<typeof GitHub>
+  try {
+    octokit = github.getOctokit(github_token)
+  } catch (e: unknown) {
+    if (e instanceof Error) {
+      core.setFailed(
+        `Could not authenticate to GitHub Releases API with provided token\n${e.message}`
+      )
+    }
+  }
+  return octokit
+}
+
+export async function pull_releases(
+  octokit: InstanceType<typeof GitHub>
+): Promise<NextflowRelease[]> {
+  const all_release_data: object[] = await all_nf_release_data(octokit)
+  const all_releases: NextflowRelease[] = []
+  for (const data of all_release_data) {
+    all_releases.push(nextflow_release(data))
+  }
+
+  return all_releases
+}
+
+export async function all_nf_release_data(
+  ok: InstanceType<typeof GitHub>
+): Promise<object[]> {
+  return await ok.paginate(
+    ok.rest.repos.listReleases,
+    NEXTFLOW_REPO,
+    response => response.data
+  )
+}
+
+export async function latest_stable_release_data(
+  ok: InstanceType<typeof GitHub>
+): Promise<object> {
+  const { data: stable_release } = await ok.rest.repos.getLatestRelease(
+    NEXTFLOW_REPO
+  )
+
+  return stable_release
+}
+
+export async function pull_latest_stable_release(
+  ok: InstanceType<typeof GitHub>
+): Promise<NextflowRelease> {
+  const latest_release = await latest_stable_release_data(ok)
+  return nextflow_release(latest_release)
+}

src/functions.ts

@@ -1,33 +1,9 @@
 import * as core from "@actions/core"
-import { GitHub } from "@actions/github/lib/utils"
 import * as tc from "@actions/tool-cache"
 import retry from "async-retry"
 import * as fs from "fs"
 import semver from "semver"
 
-const NEXTFLOW_REPO = { owner: "nextflow-io", repo: "nextflow" }
-
-// HACK Private but I want to test this
-export async function all_nf_releases(
-  ok: InstanceType<typeof GitHub>
-): Promise<object[]> {
-  return await ok.paginate(
-    ok.rest.repos.listReleases,
-    NEXTFLOW_REPO,
-    response => response.data
-  )
-}
-
-// HACK Private but I want to test this
-export async function latest_stable_release_data(
-  ok: InstanceType<typeof GitHub>
-): Promise<object> {
-  const { data: stable_release } = await ok.rest.repos.getLatestRelease(
-    NEXTFLOW_REPO
-  )
-
-  return stable_release
-}
 
 export async function release_data(
   version: string,