refactor(discord): share client rest helpers

src/discord/client.ts

@@ -0,0 +1,60 @@
+import { RequestClient } from "@buape/carbon";
+import type { RetryConfig } from "../infra/retry.js";
+import { loadConfig } from "../config/config.js";
+import { createDiscordRetryRunner, type RetryRunner } from "../infra/retry-policy.js";
+import { resolveDiscordAccount } from "./accounts.js";
+import { normalizeDiscordToken } from "./token.js";
+
+export type DiscordClientOpts = {
+  token?: string;
+  accountId?: string;
+  rest?: RequestClient;
+  retry?: RetryConfig;
+  verbose?: boolean;
+};
+
+function resolveToken(params: { explicit?: string; accountId: string; fallbackToken?: string }) {
+  const explicit = normalizeDiscordToken(params.explicit);
+  if (explicit) {
+    return explicit;
+  }
+  const fallback = normalizeDiscordToken(params.fallbackToken);
+  if (!fallback) {
+    throw new Error(
+      `Discord bot token missing for account "${params.accountId}" (set discord.accounts.${params.accountId}.token or DISCORD_BOT_TOKEN for default).`,
+    );
+  }
+  return fallback;
+}
+
+function resolveRest(token: string, rest?: RequestClient) {
+  return rest ?? new RequestClient(token);
+}
+
+export function createDiscordRestClient(opts: DiscordClientOpts, cfg = loadConfig()) {
+  const account = resolveDiscordAccount({ cfg, accountId: opts.accountId });
+  const token = resolveToken({
+    explicit: opts.token,
+    accountId: account.accountId,
+    fallbackToken: account.token,
+  });
+  const rest = resolveRest(token, opts.rest);
+  return { token, rest, account };
+}
+
+export function createDiscordClient(
+  opts: DiscordClientOpts,
+  cfg = loadConfig(),
+): { token: string; rest: RequestClient; request: RetryRunner } {
+  const { token, rest, account } = createDiscordRestClient(opts, cfg);
+  const request = createDiscordRetryRunner({
+    retry: opts.retry,
+    configRetry: account.config.retry,
+    verbose: opts.verbose,
+  });
+  return { token, rest, request };
+}
+
+export function resolveDiscordRest(opts: DiscordClientOpts) {
+  return createDiscordRestClient(opts).rest;
+}