feat: handle both thread and channel replies

src/services/slack.ts

@@ -17,18 +17,6 @@ export interface SlackBotProfile {
   team_id: string
 }
 
-export interface SlackBotMessage {
-  bot_id: string
-  type: string
-  text: string
-  user: string
-  ts: string
-  app_id: string
-  blocks: Record<string, unknown>[]
-  team: string
-  bot_profile: SlackBotProfile
-}
-
 export interface SlackReplies {
   messages: SlackMessage[]
   has_more: boolean
@@ -37,11 +25,13 @@ export interface SlackReplies {
 }
 
 export interface SlackMessage {
+  bot_id?: string
   client_msg_id?: string
   type: string
   text: string
   user: string
   ts: string
+  app_id?: string
   blocks?: Record<string, unknown>[]
   reply_count?: number
   subscribed?: boolean
@@ -50,22 +40,67 @@ export interface SlackMessage {
   team?: string
   thread_ts: string
   parent_user_id?: string
+  bot_profile?: SlackBotProfile
 }
 
 export interface SlackResponseMetadata {
   next_cursor: string
 }
 
-export type SlackSendMessageOptions = {
+export type SlackAttachment = {
+  [key: string]: any
+}
+
+export type SlackBlock = {
+  [key: string]: any
+}
+
+export type SlackPostMessageParams = {
+  /**
+   * The ID of the channel to send the message to.
+   */
+  channel: string
+
   /**
    * The text of the message to send.
    */
   text: string
 
   /**
-   * The channel ID to send the message to.
+   * The timestamp of a parent message to send the message as a reply to.
    */
-  channelId: string
+  thread_ts?: string
+  attachments?: SlackAttachment[]
+  blocks?: SlackBlock[]
+  icon_emoji?: string
+  icon_url?: string
+  link_names?: boolean
+  parse?: 'full' | 'none'
+  reply_broadcast?: boolean
+  unfurl_links?: boolean
+  unfurl_media?: boolean
+  username?: string
+}
+
+export type SlackConversationHistoryParams = {
+  channel: string
+  oldest?: string
+  cursor?: string
+  latest?: string
+  limit?: number
+  inclusive?: boolean
+  include_all_metadata?: boolean
+}
+
+export type SlackConversationRepliesParams = {
+  channel: string
+  ts: string
+  cursor?: string
+  latest?: string
+  oddest?: string
+  limit?: number
+  inclusive?: boolean
+  include_thread_metadata?: boolean
 }
 
 export type SlackSendAndWaitOptions = {
@@ -75,9 +110,9 @@ export type SlackSendAndWaitOptions = {
   text: string
 
   /**
-   * The channel ID to send the message to.
+   * The ID of the channel to send the message to.
    */
-  channelId: string
+  channel?: string
 
   /**
    * The timeout in milliseconds to wait for a reply before throwing an error.
@@ -93,17 +128,26 @@ export type SlackSendAndWaitOptions = {
    * A function to validate the reply message. If the function returns `true`, the reply is considered valid and the function will return the message. If the function returns `false`, the reply is considered invalid and the function will continue to wait for a reply until the timeout is reached.
    */
   validate?: (message: SlackMessage) => boolean
+
+  /**
+   * A stop signal from an [`AbortController`](https://developer.mozilla.org/en-US/docs/Web/API/AbortController), which can be used to abort retrying. More specifically, when `AbortController.abort(reason)` is called, the function will throw an error with the `reason` argument as the error message.
+   */
+  stopSignal?: AbortSignal
 }
 
 export class SlackClient {
   private api: typeof ky
 
+  protected defaultChannel?: string
+
   constructor({
     apiKey = process.env.SLACK_API_KEY,
-    baseUrl = SLACK_API_BASE_URL
+    baseUrl = SLACK_API_BASE_URL,
+    defaultChannel = process.env.SLACK_DEFAULT_CHANNEL
   }: {
     apiKey?: string
     baseUrl?: string
+    defaultChannel?: string
   } = {}) {
     if (!apiKey) {
       throw new Error(`Error SlackClient missing required "apiKey"`)
@@ -114,34 +158,66 @@ export class SlackClient {
         Authorization: `Bearer ${apiKey}`
       }
     })
+    this.defaultChannel = defaultChannel
   }
 
   /**
    * Sends a message to a channel.
    */
-  public async sendMessage({ text, channelId }: SlackSendMessageOptions) {
+  public async sendMessage(options: SlackPostMessageParams) {
     const res = await this.api.post('chat.postMessage', {
-      json: {
-        channel: channelId,
-        text: text
-      }
+      json: options
     })
-    return res.json<SlackBotMessage>()
+    return res.json<SlackMessage>()
+  }
+
+  /**
+   * Fetches a conversation's history of messages and events.
+   */
+  public async fetchConversationHistory(
+    options: SlackConversationHistoryParams
+  ) {
+    const response = await this.api.get('conversations.history', {
+      searchParams: options
+    })
+    return response.json<SlackReplies>()
   }
 
   /**
    * Fetches replies to a message in a channel.
    */
-  protected async fetchReplies(channelId: string, messageTs: string) {
+  protected async fetchReplies(options: SlackConversationRepliesParams) {
     const response = await this.api.get('conversations.replies', {
-      searchParams: {
-        channel: channelId,
-        ts: messageTs
-      }
+      searchParams: options
     })
     return response.json<SlackReplies>()
   }
 
+  /**
+   * Returns a list of messages that were sent in a channel after a given timestamp both directly and in threads.
+   */
+  private async fetchCandidates(channel: string, ts: string) {
+    let candidates: SlackMessage[] = []
+    const history = await this.fetchConversationHistory({ channel })
+    const directReplies = await this.fetchReplies({ channel, ts })
+    if (directReplies.ok) {
+      candidates = candidates.concat(directReplies.messages)
+    }
+    if (history.ok) {
+      candidates = candidates.concat(history.messages)
+    }
+    // Filter out older messages before the message was sent and drop bot messages:
+    candidates = candidates.filter(
+      (message) => message.ts > ts && !message.bot_id
+    )
+
+    // Sort by timestamp so that the most recent messages come first:
+    candidates.sort((a, b) => {
+      return parseFloat(b.ts) - parseFloat(a.ts)
+    })
+    return candidates
+  }
+
   /**
    * Sends a message to a channel and waits for a reply to the message, which is returned if it passes validation.
    *
@@ -151,32 +227,56 @@ export class SlackClient {
    */
   public async sendAndWaitForReply({
     text,
-    channelId,
+    channel = this.defaultChannel,
     timeoutMs = DEFAULT_SLACK_TIMEOUT_MS,
     intervalMs = DEFAULT_SLACK_INTERVAL_MS,
-    validate = () => true
+    validate = () => true,
+    stopSignal
   }: SlackSendAndWaitOptions) {
-    const res = await this.sendMessage({ text, channelId })
+    if (!channel) {
+      throw new Error(`Error SlackClient missing required "channel"`)
+    }
+    let aborted = false
+    stopSignal?.addEventListener(
+      'abort',
+      () => {
+        aborted = true
+      },
+      { once: true }
+    )
+
+    const res = await this.sendMessage({ text, channel })
     if (!res.ts) {
       throw new Error('Missing ts in response')
     }
     const start = Date.now()
-    while (Date.now() - start < timeoutMs) {
-      const response = await this.fetchReplies(channelId, res.ts)
-      if (response.ok && response.messages.length > 1) {
-        // first message is the original message
-        const candidate = response.messages[response.messages.length - 1]
-        if (validate(candidate)) {
-          return candidate
+    let nUserMessages = 0
+    do {
+      if (aborted) {
+        const reason = stopSignal?.reason || 'Aborted waiting for reply'
+        if (reason instanceof Error) {
+          throw reason
         } else {
-          await this.sendMessage({
-            text: `Invalid response: ${candidate.text}. Please try again with a valid response format.`,
-            channelId
-          })
+          throw new Error(reason)
         }
       }
+      const candidates = await this.fetchCandidates(channel, res.ts)
+      if (candidates.length > 0) {
+        const candidate = candidates[0]
+        if (validate(candidate)) {
+          return candidate
+        }
+        if (nUserMessages !== candidates.length) {
+          await this.sendMessage({
+            text: `Invalid response: ${candidate.text}. Please try again following the instructions.`,
+            channel,
+            thread_ts: candidate.ts
+          })
+        }
+        nUserMessages = candidates.length
+      }
       await sleep(intervalMs)
-    }
+    } while (Date.now() - start < timeoutMs)
     throw new Error('Reached timeout waiting for reply')
   }
 }