Market tweaks (#499)

* split into own folder

* round the amounts

* sort the order book

* add test

* don't let one sell go to multiple buys

apps/actors/systems/kvSync/ddTests.ts

@@ -51,7 +51,7 @@ export function kvSyncTests(writeResults: boolean): Suite {
       name: "commodityMarket",
       test() {
         runDDTestAtPath(
-          "apps/actors/systems/kvSync/examples/commodityMarket.dd.txt",
+          "apps/actors/systems/kvSync/examples/commodityMarket/commodityMarket.dd.txt",
           (inputs) => kvSyncTest(commodityMarket, inputs),
           writeResults
         );

apps/actors/systems/kvSync/examples/commodityMarket/choose.ts

@@ -0,0 +1,32 @@
+import { randomFromList, randStep2 } from "../../../../../../util/util";
+import { ClientState } from "../../client";
+import { MutationInvocation } from "../../types";
+import { OrderSide } from "./types";
+
+export function choose(
+  clients: {
+    [id: string]: ClientState;
+  },
+  randomSeed: number
+): [{ clientID: string; invocation: MutationInvocation } | null, number] {
+  const [clientID, randomSeed1] = randomFromList(
+    randomSeed,
+    Object.keys(clients)
+  );
+
+  const [amount1, randomSeed2] = randStep2(randomSeed1);
+  const [price, randomSeed3] = randStep2(randomSeed2);
+  const side = randomFromList(randomSeed3, ["buy", "sell"])[0] as OrderSide;
+
+  return [
+    {
+      clientID,
+      invocation: {
+        type: "Invocation",
+        name: "Order",
+        args: [Math.round(price * 100), Math.round(amount1 * 100), side],
+      },
+    },
+    randomSeed3,
+  ];
+}