Add threads archive cron

Discord archives threads after specific number of days (max 7 days). But
our threads may need more time to be alive. This is a cron job that will
monitor threads and ask user to archive it or extend it to be long
living thread that won't get archived.

.gitignore

@@ -129,7 +129,7 @@ dist
 .yarn/install-state.gz
 .pnp.*
 
-brain.json
+data/
 
 # direnv
 .envrc

cron/thread-lifecycle.js

@@ -0,0 +1,78 @@
+const GUILD = process.env.GUILD
+
+const { MessageActionRow, MessageButton } = require("discord.js")
+const moment = require("moment")
+
+const { read } = require("../utils/storage")
+
+function weekdaysBefore(theMoment, days) {
+  let newMoment = theMoment.clone()
+  while (days > 0) {
+    if (newMoment.isoWeekday() < 6) {
+      days -= 1
+    }
+    newMoment = newMoment.subtract(1, "days")
+  }
+  return newMoment
+}
+
+function archiveThreadPrompt(client, thread) {
+  if (thread.ownerId === client.user.id) {
+    thread.setArchived(true)
+    return
+  }
+
+  const row = new MessageActionRow()
+    .addComponents(
+      new MessageButton()
+        .setCustomId("archive-thread")
+        .setLabel("Archive The Thread")
+        .setStyle("DANGER")
+    )
+    .addComponents(
+      new MessageButton()
+        .setCustomId("long-running-thread")
+        .setLabel("Long-Running Thread")
+        .setStyle("SECONDARY")
+    )
+
+  thread.send({
+    content: `<@${thread.ownerId}>, it's been a bit since this thread has seen activity. Ready to archive it?`,
+    components: [row],
+  })
+}
+
+module.exports = {
+  schedule: "*/15 * * * *",
+  timezone: "America/New_York",
+  execute(client) {
+    return async () => {
+      const guild = await client.guilds.fetch(GUILD)
+      const channels = await guild.channels.fetch()
+      const longRunningThreadIds = (await read("long-running-thread-ids")) || {}
+      const archiveThreshold = weekdaysBefore(moment(), 4)
+      channels
+        .filter((channel) => channel.isText() && channel.viewable)
+        .forEach(async (channel) => {
+          const threads = await channel.threads.fetch()
+          threads.threads.forEach(async (thread) => {
+            const messages = await thread.messages.fetch({ limit: 1 })
+            const lastActivity = Math.max(
+              (messages.first() && messages.first().createdTimestamp) || 0,
+              thread.archiveTimestamp
+            )
+            if (moment(lastActivity).isAfter(archiveThreshold)) {
+              return
+            }
+
+            if (longRunningThreadIds[thread.id]) {
+              await thread.setArchived(true)
+              thread.setArchived(false)
+            } else {
+              archiveThreadPrompt(client, thread)
+            }
+          })
+        })
+    }
+  },
+}

scripts/button-interactions.js

@@ -0,0 +1,30 @@
+const { read, write } = require("../utils/storage")
+
+async function archiveThread(client, interaction) {
+  const guild = await client.guilds.fetch(interaction.guildId)
+  const channel = await guild.channels.fetch(interaction.channelId)
+  await interaction.reply("Done!")
+  channel.setArchived(true)
+}
+
+async function markThreadLongRunning(interaction) {
+  let longRunningThreadIds = (await read("long-running-thread-ids")) || {}
+  longRunningThreadIds[interaction.channelId] = true
+  await write("long-running-thread-ids", longRunningThreadIds)
+  await interaction.reply("Alright. I'll keep the thread alive.")
+}
+
+module.exports = {
+  trigger: "interactionCreate",
+  execute(client) {
+    return async (interaction) => {
+      if (!interaction.isButton()) return
+      if (interaction.customId === "archive-thread") {
+        archiveThread(client, interaction)
+      }
+      if (interaction.customId === "long-running-thread") {
+        markThreadLongRunning(interaction)
+      }
+    }
+  },
+}

utils/storage.js

@@ -0,0 +1,37 @@
+const EventEmitter = require("events")
+
+let brainLock = false
+const emitter = new EventEmitter()
+const fs = require("fs")
+
+const storageFilePath = "data/storage.json"
+
+module.exports = {
+  async read(key) {
+    if (brainLock) {
+      await new Promise((resolve) => emitter.once("unlocked", resolve))
+    }
+    brainLock = true
+
+    const data = await fs.promises.readFile(storageFilePath)
+    const value = JSON.parse(data.toString())[key]
+
+    brainLock = false
+    emitter.emit("unlocked")
+    return value
+  },
+  async write(key, val) {
+    if (brainLock) {
+      await new Promise((resolve) => emitter.once("unlocked", resolve))
+    }
+    brainLock = true
+
+    const data = await fs.promises.readFile(storageFilePath)
+    let brain = JSON.parse(data.toString())
+    brain[key] = val
+    await fs.promises.writeFile(storageFilePath, JSON.stringify(brain, null, 2))
+
+    brainLock = false
+    emitter.emit("unlocked")
+  },
+}