From ed73c5705ec4ab626636622b7706d7b1885ac773 Mon Sep 17 00:00:00 2001
From: Chris Hibbert <hibbert@agoric.com>
Date: Mon, 23 May 2022 15:47:12 -0700
Subject: [PATCH] refactor: add notifier and subscription to state

---
 packages/run-protocol/src/vpool-xyk-amm/pool.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/packages/run-protocol/src/vpool-xyk-amm/pool.js b/packages/run-protocol/src/vpool-xyk-amm/pool.js
index b169a1f28a95..67f6d4cc9c64 100644
--- a/packages/run-protocol/src/vpool-xyk-amm/pool.js
+++ b/packages/run-protocol/src/vpool-xyk-amm/pool.js
@@ -42,6 +42,8 @@ export const publicPrices = prices => {
  * @typedef {{
  * updater: IterationObserver<any>,
  * notifier: Notifier<any>,
+ * metricsPublication: IterationObserver<PoolMetricsNotification>,
+ * metricsSubscription: Subscription<PoolMetricsNotification>
  * poolSeat: ZCFSeat,
  * liqTokenSupply: bigint,
  * }} MutableState
@@ -123,7 +125,9 @@ const helperBehavior = {
     facets.helper.updateMetrics();
     return 'Added liquidity.';
   },
-  updateMetrics: ({ state, facets }) => {
+  /** @param {MethodContext} context */
+  updateMetrics: context => {
+    const { state, facets } = context;
     const payload = harden({
       Central: facets.pool.getCentralAmount(),
       Secondary: facets.pool.getSecondaryAmount(),