feat(fast-usdc): publish feeConfig to vstorage

packages/boot/test/fast-usdc/fast-usdc.test.ts

@@ -117,6 +117,15 @@ test.serial('writes feed policy to vstorage', async t => {
   await documentStorageSchema(t, storage, doc);
 });
 
+test.serial('writes fee config to vstorage', async t => {
+  const { storage } = t.context;
+  const doc = {
+    node: 'fastUsdc.feeConfig',
+    owner: 'the fee configuration for Fast USDC',
+  };
+  await documentStorageSchema(t, storage, doc);
+});
+
 test.serial('writes status updates to vstorage', async t => {
   const { walletFactoryDriver: wd, storage } = t.context;
   const wallet = await wd.provideSmartWallet(

packages/boot/test/fast-usdc/snapshots/fast-usdc.test.ts.md

@@ -18,6 +18,20 @@ Generated by [AVA](https://avajs.dev).
       ],
     ]
 
+## writes fee config to vstorage
+
+> Under "published", the "fastUsdc.feeConfig" node is delegated to the fee configuration for Fast USDC.
+> The example below illustrates the schema of the data published there.
+> 
+> See also board marshalling conventions (_to appear_).
+
+    [
+      [
+        'published.fastUsdc.feeConfig',
+        '{"blockHeight":"0","values":["{\\"body\\":\\"#{\\\\\\"contractRate\\\\\\":{\\\\\\"denominator\\\\\\":{\\\\\\"brand\\\\\\":\\\\\\"$0.Alleged: USDC brand\\\\\\",\\\\\\"value\\\\\\":\\\\\\"+10\\\\\\"},\\\\\\"numerator\\\\\\":{\\\\\\"brand\\\\\\":\\\\\\"$0\\\\\\",\\\\\\"value\\\\\\":\\\\\\"+2\\\\\\"}},\\\\\\"flat\\\\\\":{\\\\\\"brand\\\\\\":\\\\\\"$0\\\\\\",\\\\\\"value\\\\\\":\\\\\\"+10000\\\\\\"},\\\\\\"maxVariable\\\\\\":{\\\\\\"brand\\\\\\":\\\\\\"$0\\\\\\",\\\\\\"value\\\\\\":\\\\\\"+5000000\\\\\\"},\\\\\\"variableRate\\\\\\":{\\\\\\"denominator\\\\\\":{\\\\\\"brand\\\\\\":\\\\\\"$0\\\\\\",\\\\\\"value\\\\\\":\\\\\\"+100\\\\\\"},\\\\\\"numerator\\\\\\":{\\\\\\"brand\\\\\\":\\\\\\"$0\\\\\\",\\\\\\"value\\\\\\":\\\\\\"+1\\\\\\"}}}\\",\\"slots\\":[\\"board01029\\"]}"]}',
+      ],
+    ]
+
 ## writes status updates to vstorage
 
 > Under "published", the "fastUsdc.status" node is delegated to the statuses of fast USDC transfers identified by their tx hashes.

packages/fast-usdc/src/fast-usdc.contract.js

@@ -30,12 +30,14 @@ import * as flows from './fast-usdc.flows.js';
 const trace = makeTracer('FastUsdc');
 
 const STATUS_NODE = 'status';
+const FEE_NODE = 'feeConfig';
 
 /**
  * @import {HostInterface} from '@agoric/async-flow';
  * @import {CosmosChainInfo, Denom, DenomDetail, OrchestrationAccount} from '@agoric/orchestration';
  * @import {OrchestrationPowers, OrchestrationTools} from '@agoric/orchestration/src/utils/start-helper.js';
- * @import {Vow} from '@agoric/vow';
+ * @import {Remote} from '@agoric/internal';
+ * @import {Marshaller, StorageNode} from '@agoric/internal/src/lib-chainStorage.js'
  * @import {Zone} from '@agoric/zone';
  * @import {OperatorKit} from './exos/operator-kit.js';
  * @import {CctpTxEvidence, FeeConfig} from './types.js';
@@ -63,6 +65,17 @@ export const meta = {
 };
 harden(meta);
 
+/**
+ * @param {Remote<StorageNode>} node
+ * @param {ERef<Marshaller>} marshaller
+ * @param {FeeConfig} feeConfig
+ */
+const publishFeeConfig = async (node, marshaller, feeConfig) => {
+  const feeNode = E(node).makeChildNode(FEE_NODE);
+  const value = await E(marshaller).toCapData(feeConfig);
+  return E(feeNode).setValue(JSON.stringify(value));
+};
+
 /**
  * @param {ZCF<FastUsdcTerms>} zcf
  * @param {OrchestrationPowers & {
@@ -80,14 +93,13 @@ export const contract = async (zcf, privateArgs, zone, tools) => {
   assert('USDC' in terms.brands, 'no USDC brand');
   assert('usdcDenom' in terms, 'no usdcDenom');
 
-  const { feeConfig, marshaller } = privateArgs;
+  const { feeConfig, marshaller, storageNode } = privateArgs;
   const { makeRecorderKit } = prepareRecorderKitMakers(
     zone.mapStore('vstorage'),
     marshaller,
   );
 
-  const makeStatusNode = () =>
-    E(privateArgs.storageNode).makeChildNode(STATUS_NODE);
+  const makeStatusNode = () => E(storageNode).makeChildNode(STATUS_NODE);
   const statusManager = prepareStatusManager(zone, makeStatusNode);
 
   const { USDC } = terms.brands;
@@ -209,6 +221,8 @@ export const contract = async (zcf, privateArgs, zone, tools) => {
   // So we use zone.exoClassKit above to define the liquidity pool kind
   // and pass the shareMint into the maker / init function.
 
+  void publishFeeConfig(storageNode, marshaller, feeConfig);
+
   const shareMint = await provideSingleton(
     zone.mapStore('mint'),
     'PoolShare',