feat: error handling (#3)

### Explanation

_No response_

### Issue

_No response_

### Attestations

- [x] I have read and agree to the [Code of Conduct](https://docs.nhcarrigan.com/community/coc/)
- [x] I have read and agree to the [Community Guidelines](https://docs.nhcarrigan.com/community/guide/).
- [x] My contribution complies with the [Contributor Covenant](https://docs.nhcarrigan.com/dev/covenant/).

### Dependencies

- [ ] I have pinned the dependencies to a specific patch version.

### Style

- [x] I have run the linter and resolved any errors.
- [x] My pull request uses an appropriate title, matching the conventional commit standards.
- [x] My scope of feat/fix/chore/etc. correctly matches the nature of changes in my pull request.

### Tests

- [ ] My contribution adds new code, and I have added tests to cover it.
- [ ] My contribution modifies existing code, and I have updated the tests to reflect these changes.
- [ ] All new and existing tests pass locally with my changes.
- [ ] Code coverage remains at or above the configured threshold.

### Documentation

_No response_

### Versioning

_No response_

Reviewed-on: #3
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

src/index.ts

@@ -28,6 +28,22 @@ const commands: Record<
   "summarise": summarise,
 };
 
+process.on("unhandledRejection", (error) => {
+  if (error instanceof Error) {
+    void logger.error("Unhandled Rejection", error);
+    return;
+  }
+  void logger.error("unhandled rejection", new Error(String(error)));
+});
+
+process.on("uncaughtException", (error) => {
+  if (error instanceof Error) {
+    void logger.error("Uncaught Exception", error);
+    return;
+  }
+  void logger.error("uncaught exception", new Error(String(error)));
+});
+
 const client = new Client({
   intents: [],
 });

src/modules/about.ts

@@ -13,14 +13,18 @@ import {
   MessageFlags,
   type ChatInputCommandInteraction,
 } from "discord.js";
+import { logger } from "../utils/logger.js";
+import { replyToError } from "../utils/replyToError.js";
 
 /**
  * Responds with information about the bot.
  * @param interaction -- The interaction payload from Discord.
  */
+// eslint-disable-next-line max-lines-per-function -- Refactor at a later time.
 export const about = async(
   interaction: ChatInputCommandInteraction,
 ): Promise<void> => {
+  try {
     await interaction.deferReply({ flags: [ MessageFlags.Ephemeral ] });
 
     const version = process.env.npm_package_version ?? "Unknown";
@@ -65,4 +69,10 @@ export const about = async(
       components: [ row ],
       embeds:     [ embed ],
     });
+  } catch (error) {
+    await replyToError(interaction);
+    if (error instanceof Error) {
+      await logger.error("about command", error);
+    }
+  }
 };

src/modules/alt.ts

@@ -8,6 +8,8 @@ import { personality } from "../config/personality.js";
 import { ai } from "../utils/ai.js";
 import { calculateCost } from "../utils/calculateCost.js";
 import { isSubscribed } from "../utils/isSubscribed.js";
+import { logger } from "../utils/logger.js";
+import { replyToError } from "../utils/replyToError.js";
 import type { ImageBlockParam } from "@anthropic-ai/sdk/resources/index.js";
 
 const isValidContentType = (
@@ -31,6 +33,7 @@ const isValidContentType = (
 export const alt = async(
   interaction: ChatInputCommandInteraction,
 ): Promise<void> => {
+  try {
     await interaction.deferReply({ flags: [ MessageFlags.Ephemeral ] });
     const sub = await isSubscribed(interaction);
     if (!sub) {
@@ -113,4 +116,10 @@ export const alt = async(
 
     const { usage } = messages;
     await calculateCost(usage, interaction.user.username, "alt-text");
+  } catch (error) {
+    await replyToError(interaction);
+    if (error instanceof Error) {
+      await logger.error("alt-text command", error);
+    }
+  }
 };

src/modules/evaluate.ts

@@ -8,6 +8,8 @@ import { personality } from "../config/personality.js";
 import { ai } from "../utils/ai.js";
 import { calculateCost } from "../utils/calculateCost.js";
 import { isSubscribed } from "../utils/isSubscribed.js";
+import { logger } from "../utils/logger.js";
+import { replyToError } from "../utils/replyToError.js";
 
 /**
  * Accepts an arbitrary code snippet from the user, then sends
@@ -17,6 +19,7 @@ import { isSubscribed } from "../utils/isSubscribed.js";
 export const evaluate = async(
   interaction: ChatInputCommandInteraction,
 ): Promise<void> => {
+  try {
     await interaction.deferReply({ flags: [ MessageFlags.Ephemeral ] });
     const sub = await isSubscribed(interaction);
     if (!sub) {
@@ -44,4 +47,10 @@ export const evaluate = async(
 
     const { usage } = messages;
     await calculateCost(usage, interaction.user.username, "evaluate");
+  } catch (error) {
+    await replyToError(interaction);
+    if (error instanceof Error) {
+      await logger.error("evaluate command", error);
+    }
+  }
 };

src/modules/mood.ts

@@ -8,6 +8,8 @@ import { personality } from "../config/personality.js";
 import { ai } from "../utils/ai.js";
 import { calculateCost } from "../utils/calculateCost.js";
 import { isSubscribed } from "../utils/isSubscribed.js";
+import { logger } from "../utils/logger.js";
+import { replyToError } from "../utils/replyToError.js";
 
 /**
  * Accepts a text snippet from the user. Submits it to Anthropic
@@ -17,6 +19,7 @@ import { isSubscribed } from "../utils/isSubscribed.js";
 export const mood = async(
   interaction: ChatInputCommandInteraction,
 ): Promise<void> => {
+  try {
     await interaction.deferReply({ flags: [ MessageFlags.Ephemeral ] });
     const sub = await isSubscribed(interaction);
     if (!sub) {
@@ -45,4 +48,10 @@ export const mood = async(
 
     const { usage } = messages;
     await calculateCost(usage, interaction.user.username, "mood");
+  } catch (error) {
+    await replyToError(interaction);
+    if (error instanceof Error) {
+      await logger.error("mood command", error);
+    }
+  }
 };

src/modules/proofread.ts

@@ -8,6 +8,8 @@ import { personality } from "../config/personality.js";
 import { ai } from "../utils/ai.js";
 import { calculateCost } from "../utils/calculateCost.js";
 import { isSubscribed } from "../utils/isSubscribed.js";
+import { logger } from "../utils/logger.js";
+import { replyToError } from "../utils/replyToError.js";
 
 /**
  * Accepts a text snippet from the user. Submits it to Anthropic
@@ -17,6 +19,7 @@ import { isSubscribed } from "../utils/isSubscribed.js";
 export const proofread = async(
   interaction: ChatInputCommandInteraction,
 ): Promise<void> => {
+  try {
     await interaction.deferReply({ flags: [ MessageFlags.Ephemeral ] });
     const sub = await isSubscribed(interaction);
     if (!sub) {
@@ -45,4 +48,10 @@ export const proofread = async(
 
     const { usage } = messages;
     await calculateCost(usage, interaction.user.username, "proofread");
+  } catch (error) {
+    await replyToError(interaction);
+    if (error instanceof Error) {
+      await logger.error("proofread command", error);
+    }
+  }
 };

src/modules/query.ts

@@ -8,6 +8,8 @@ import { personality } from "../config/personality.js";
 import { ai } from "../utils/ai.js";
 import { calculateCost } from "../utils/calculateCost.js";
 import { isSubscribed } from "../utils/isSubscribed.js";
+import { logger } from "../utils/logger.js";
+import { replyToError } from "../utils/replyToError.js";
 
 /**
  * Accepts an arbitrary question from the user, then sends it to Anthropic
@@ -17,6 +19,7 @@ import { isSubscribed } from "../utils/isSubscribed.js";
 export const query = async(
   interaction: ChatInputCommandInteraction,
 ): Promise<void> => {
+  try {
     await interaction.deferReply({ flags: [ MessageFlags.Ephemeral ] });
     const sub = await isSubscribed(interaction);
     if (!sub) {
@@ -45,4 +48,10 @@ export const query = async(
 
     const { usage } = messages;
     await calculateCost(usage, interaction.user.username, "query");
+  } catch (error) {
+    await replyToError(interaction);
+    if (error instanceof Error) {
+      await logger.error("query command", error);
+    }
+  }
 };

src/modules/summarise.ts

@@ -8,6 +8,8 @@ import { personality } from "../config/personality.js";
 import { ai } from "../utils/ai.js";
 import { calculateCost } from "../utils/calculateCost.js";
 import { isSubscribed } from "../utils/isSubscribed.js";
+import { logger } from "../utils/logger.js";
+import { replyToError } from "../utils/replyToError.js";
 
 /**
  * Accepts a text snippet from the user. Submits it to Anthropic
@@ -17,6 +19,7 @@ import { isSubscribed } from "../utils/isSubscribed.js";
 export const summarise = async(
   interaction: ChatInputCommandInteraction,
 ): Promise<void> => {
+  try {
     await interaction.deferReply({ flags: [ MessageFlags.Ephemeral ] });
     const sub = await isSubscribed(interaction);
     if (!sub) {
@@ -45,4 +48,10 @@ export const summarise = async(
 
     const { usage } = messages;
     await calculateCost(usage, interaction.user.username, "summarise");
+  } catch (error) {
+    await replyToError(interaction);
+    if (error instanceof Error) {
+      await logger.error("summarise command", error);
+    }
+  }
 };

src/utils/replyToError.ts

@@ -0,0 +1,38 @@
+/**
+ * @copyright nhcarrigan
+ * @license Naomi's Public License
+ * @author Naomi Carrigan
+ */
+import {
+  ActionRowBuilder,
+  ButtonBuilder,
+  ButtonStyle,
+  type ChatInputCommandInteraction,
+  type MessageContextMenuCommandInteraction,
+} from "discord.js";
+
+/**
+ * Responds to an interaction with a generic error message.
+ * @param interaction -- The interaction payload from Discord.
+ */
+export const replyToError = async(
+  interaction:
+    | ChatInputCommandInteraction
+    | MessageContextMenuCommandInteraction,
+): Promise<void> => {
+  const button = new ButtonBuilder().setLabel("Need help?").
+    setStyle(ButtonStyle.Link).
+    setURL("https://chat.nhcarrigan.com");
+  const row = new ActionRowBuilder<ButtonBuilder>().addComponents(button);
+  if (interaction.deferred || interaction.replied) {
+    await interaction.editReply({
+      components: [ row ],
+      content:    "An error occurred while running this command.",
+    });
+    return;
+  }
+  await interaction.reply({
+    components: [ row ],
+    content:    "An error occurred while running this command.",
+  });
+};