From 166f5440d0afb782a61f011a19a5e4382a543a3e Mon Sep 17 00:00:00 2001
From: Pete Vilter <pete.vilter@gmail.com>
Date: Sun, 24 Nov 2024 17:45:43 -0500
Subject: [PATCH] Commodity market (#498)

* start commodity market

* set up form

* remove buy button

* tweaks

* start triggers

* trigger fixpoint loop

* iterations

* fix loop

* execute trade

* commodity market ddtest

* logging

* logging & tweaks

* update

* 'fix' missing writes

* tweak

* remove some logging

* add choose fn

* test the fuzzer
---
 apps/actors/systems/kvSync/client.ts          |    1 +
 apps/actors/systems/kvSync/common.ts          |   11 +
 apps/actors/systems/kvSync/ddTests.ts         |   13 +-
 .../kvSync/examples/commodityMarket.dd.txt    | 2088 +++++++++++++++++
 .../kvSync/examples/commodityMarket.tsx       |  328 +++
 apps/actors/systems/kvSync/examples/index.ts  |    6 +-
 .../examples/{market.tsx => itemMarket.tsx}   |    8 +-
 apps/actors/systems/kvSync/examples/types.ts  |   11 +-
 apps/actors/systems/kvSync/index.ts           |    8 +-
 apps/actors/systems/kvSync/mvcc.ts            |    6 +-
 apps/actors/systems/kvSync/server.ts          |   82 +-
 apps/actors/systems/kvSync/types.ts           |   10 +
 .../systems/kvSync/uiCommon/kvInspector.tsx   |    5 +-
 .../systems/kvSync/uiCommon/loginWrapper.tsx  |    2 +
 14 files changed, 2541 insertions(+), 38 deletions(-)
 create mode 100644 apps/actors/systems/kvSync/examples/commodityMarket.dd.txt
 create mode 100644 apps/actors/systems/kvSync/examples/commodityMarket.tsx
 rename apps/actors/systems/kvSync/examples/{market.tsx => itemMarket.tsx} (95%)

diff --git a/apps/actors/systems/kvSync/client.ts b/apps/actors/systems/kvSync/client.ts
index 41b181e7..aca970cb 100644
--- a/apps/actors/systems/kvSync/client.ts
+++ b/apps/actors/systems/kvSync/client.ts
@@ -118,6 +118,7 @@ function processLiveQueryUpdate(
   updateMsg: LiveQueryUpdate
 ): ClientState {
   const newData = { ...state.data };
+
   for (const update of updateMsg.updates) {
     const key = update.key;
     switch (update.type) {
diff --git a/apps/actors/systems/kvSync/common.ts b/apps/actors/systems/kvSync/common.ts
index 6d9a8c39..51378c0b 100644
--- a/apps/actors/systems/kvSync/common.ts
+++ b/apps/actors/systems/kvSync/common.ts
@@ -52,6 +52,17 @@ export class MutationContextImpl implements MutationCtx {
     return val.value;
   }
 
+  scan(prefix: string): Json[] {
+    const out: Json[] = [];
+    for (const [key, values] of Object.entries(this.kvData)) {
+      if (key.startsWith(prefix)) {
+        const value = getVisibleValue(this.isTxnCommitted, this.kvData, key);
+        out.push(value.value);
+      }
+    }
+    return out;
+  }
+
   write(key: string, value: Json) {
     const [newKVData, writeOp] = doWrite(
       this.kvData,
diff --git a/apps/actors/systems/kvSync/ddTests.ts b/apps/actors/systems/kvSync/ddTests.ts
index a6faff66..ab9a1fcf 100644
--- a/apps/actors/systems/kvSync/ddTests.ts
+++ b/apps/actors/systems/kvSync/ddTests.ts
@@ -23,6 +23,7 @@ import {
 import { explore } from "../../explore";
 import { mapObj } from "../../../../util/util";
 import { counter } from "./examples/counter";
+import { commodityMarket } from "./examples/commodityMarket";
 
 export function kvSyncTests(writeResults: boolean): Suite {
   return [
@@ -46,6 +47,16 @@ export function kvSyncTests(writeResults: boolean): Suite {
         );
       },
     },
+    {
+      name: "commodityMarket",
+      test() {
+        runDDTestAtPath(
+          "apps/actors/systems/kvSync/examples/commodityMarket.dd.txt",
+          (inputs) => kvSyncTest(commodityMarket, inputs),
+          writeResults
+        );
+      },
+    },
   ];
 }
 
@@ -56,7 +67,7 @@ function kvSyncTest(app: KVApp, testCases: string[]): TestOutput[] {
     state: KVSyncState,
     init: LoadedTickInitiator<KVSyncState, KVSyncMsg>
   ) => {
-    return update(app.mutations, state, init);
+    return update(app, state, init);
   };
 
   return testCases.map((testCase) => {
diff --git a/apps/actors/systems/kvSync/examples/commodityMarket.dd.txt b/apps/actors/systems/kvSync/examples/commodityMarket.dd.txt
new file mode 100644
index 00000000..30bcb41d
--- /dev/null
+++ b/apps/actors/systems/kvSync/examples/commodityMarket.dd.txt
@@ -0,0 +1,2088 @@
+addClient{id: "0"}.
+signUp{clientID: "0", username: "alice", password: ""}.
+addClient{id: "1"}.
+signUp{clientID: "1", username: "bob", password: ""}.
+runMutation{from: "0", name: "Order", args: [10, 100, "sell"]}.
+runMutation{from: "1", name: "Order", args: [10, 50, "buy"]}.
+.jsonState
+----
+application/json
+{
+  "server": {
+    "/orders/0.31381383055244927": [
+      {
+        "transactionID": "0.00037566525896607457",
+        "value": {
+          "id": 0.31381383055244927,
+          "price": 10,
+          "amount": 100,
+          "side": "sell",
+          "status": "open",
+          "user": "alice"
+        }
+      },
+      {
+        "transactionID": "0.0003834916282291446",
+        "value": {
+          "id": 0.31381383055244927,
+          "price": 10,
+          "amount": 50,
+          "status": "open",
+          "side": "sell",
+          "user": "alice"
+        }
+      }
+    ],
+    "/orders/0.4453516187568676": [
+      {
+        "transactionID": "0.0003834916282291446",
+        "value": {
+          "id": 0.4453516187568676,
+          "price": 10,
+          "amount": 50,
+          "side": "buy",
+          "status": "open",
+          "user": "bob"
+        }
+      },
+      {
+        "transactionID": "0.0003834916282291446",
+        "value": {
+          "id": 0.4453516187568676,
+          "price": 10,
+          "amount": 0,
+          "status": "sold",
+          "side": "buy",
+          "user": "bob"
+        }
+      }
+    ],
+    "/trades/0.02466078710245042": [
+      {
+        "transactionID": "0.0003834916282291446",
+        "value": {
+          "id": 0.02466078710245042,
+          "buyOrder": 0.4453516187568676,
+          "sellOrder": 0.31381383055244927,
+          "amount": 50,
+          "price": 10
+        }
+      }
+    ]
+  },
+  "user0": {},
+  "client0": {
+    "/orders/0.31381383055244927": [
+      {
+        "transactionID": "0.00037566525896607457",
+        "value": {
+          "id": 0.31381383055244927,
+          "price": 10,
+          "amount": 100,
+          "side": "sell",
+          "status": "open",
+          "user": "alice"
+        }
+      }
+    ]
+  },
+  "user1": {},
+  "client1": {
+    "/orders/0.4453516187568676": [
+      {
+        "transactionID": "0.0003834916282291446",
+        "value": {
+          "id": 0.4453516187568676,
+          "price": 10,
+          "amount": 50,
+          "side": "buy",
+          "status": "open",
+          "user": "bob"
+        }
+      }
+    ]
+  }
+}
+
+addClient{id: "0"}.
+signUp{clientID: "0", username: "alice", password: ""}.
+addClient{id: "1"}.
+signUp{clientID: "1", username: "bob", password: ""}.
+explore{seed: 123548762349586, steps: 100}.
+.jsonState
+----
+application/json
+{
+  "server": {
+    "/orders/0.31381383055244927": [
+      {
+        "transactionID": "0.00037566525896607457",
+        "value": {
+          "id": 0.31381383055244927,
+          "price": 37.316768604625736,
+          "amount": 20.142637957020327,
+          "side": "sell",
+          "status": "open",
+          "user": "alice"
+        }
+      },
+      {
+        "transactionID": "0.5728273955852048",
+        "value": {
+          "id": 0.31381383055244927,
+          "price": 37.316768604625736,
+          "amount": 0,
+          "status": "sold",
+          "side": "sell",
+          "user": "alice"
+        }
+      }
+    ],
+    "/orders/0.015206331866985496": [
+      {
+        "transactionID": "0.26905546502122235",
+        "value": {
+          "id": 0.015206331866985496,
+          "price": 16.929892745735025,
+          "amount": 85.09055332754791,
+          "side": "buy",
+          "status": "open",
+          "user": "alice"
+        }
+      },
+      {
+        "transactionID": "0.2581415779498793",
+        "value": {
+          "id": 0.015206331866985496,
+          "price": 16.929892745735025,
+          "amount": 74.38574868662819,
+          "status": "open",
+          "side": "buy",
+          "user": "alice"
+        }
+      },
+      {
+        "transactionID": "0.619620117004607",
+        "value": {
+          "id": 0.015206331866985496,
+          "price": 16.929892745735025,
+          "amount": 67.19771946519401,
+          "status": "open",
+          "side": "buy",
+          "user": "alice"
+        }
+      },
+      {
+        "transactionID": "0.787366886890835",
+        "value": {
+          "id": 0.015206331866985496,
+          "price": 16.929892745735025,
+          "amount": 32.872100763835114,
+          "status": "open",
+          "side": "buy",
+          "user": "alice"
+        }
+      },
+      {
+        "transactionID": "0.8598554999193694",
+        "value": {
+          "id": 0.015206331866985496,
+          "price": 16.929892745735025,
+          "amount": 0,
+          "status": "sold",
+          "side": "buy",
+          "user": "alice"
+        }
+      }
+    ],
+    "/orders/0.5100409435201818": [
+      {
+        "transactionID": "0.5728273955852048",
+        "value": {
+          "id": 0.5100409435201818,
+          "price": 60.20900012013409,
+          "amount": 88.19302724506056,
+          "side": "buy",
+          "status": "open",
+          "user": "alice"
+        }
+      },
+      {
+        "transactionID": "0.5728273955852048",
+        "value": {
+          "id": 0.5100409435201818,
+          "price": 60.20900012013409,
+          "amount": 68.05038928804024,
+          "status": "open",
+          "side": "buy",
+          "user": "alice"
+        }
+      },
+      {
+        "transactionID": "0.2581415779498793",
+        "value": {
+          "id": 0.5100409435201818,
+          "price": 60.20900012013409,
+          "amount": 57.34558464712052,
+          "status": "open",
+          "side": "buy",
+          "user": "alice"
+        }
+      },
+      {
+        "transactionID": "0.0003834916282291446",
+        "value": {
+          "id": 0.5100409435201818,
+          "price": 60.20900012013409,
+          "amount": 0,
+          "status": "sold",
+          "side": "buy",
+          "user": "alice"
+        }
+      }
+    ],
+    "/trades/0.2581415779498793": [
+      {
+        "transactionID": "0.5728273955852048",
+        "value": {
+          "id": 0.2581415779498793,
+          "buyOrder": 0.5100409435201818,
+          "sellOrder": 0.31381383055244927,
+          "amount": 20.142637957020327,
+          "price": 48.762884362379914
+        }
+      }
+    ],
+    "/orders/0.5855064094862961": [
+      {
+        "transactionID": "0.2581415779498793",
+        "value": {
+          "id": 0.5855064094862961,
+          "price": 15.652298755619952,
+          "amount": 10.70480464091972,
+          "side": "sell",
+          "status": "open",
+          "user": "alice"
+        }
+      },
+      {
+        "transactionID": "0.2581415779498793",
+        "value": {
+          "id": 0.5855064094862961,
+          "price": 15.652298755619952,
+          "amount": 0,
+          "status": "sold",
+          "side": "sell",
+          "user": "alice"
+        }
+      },
+      {
+        "transactionID": "0.2581415779498793",
+        "value": {
+          "id": 0.5855064094862961,
+          "price": 15.652298755619952,
+          "amount": 0,
+          "status": "sold",
+          "side": "sell",
+          "user": "alice"
+        }
+      }
+    ],
+    "/trades/0.6062274799740198": [
+      {
+        "transactionID": "0.2581415779498793",
+        "value": {
+          "id": 0.6062274799740198,
+          "buyOrder": 0.5100409435201818,
+          "sellOrder": 0.5855064094862961,
+          "amount": 10.70480464091972,
+          "price": 37.93064943787702
+        }
+      }
+    ],
+    "/trades/0.8652590050969823": [
+      {
+        "transactionID": "0.2581415779498793",
+        "value": {
+          "id": 0.8652590050969823,
+          "buyOrder": 0.015206331866985496,
+          "sellOrder": 0.5855064094862961,
+          "amount": 10.70480464091972,
+          "price": 16.29109575067749
+        }
+      }
+    ],
+    "/orders/0.4453516187568676": [
+      {
+        "transactionID": "0.0003834916282291446",
+        "value": {
+          "id": 0.4453516187568676,
+          "price": 45.81208093633138,
+          "amount": 91.73236223099042,
+          "side": "sell",
+          "status": "open",
+          "user": "bob"
+        }
+      },
+      {
+        "transactionID": "0.0003834916282291446",
+        "value": {
+          "id": 0.4453516187568676,
+          "price": 45.81208093633138,
+          "amount": 34.3867775838699,
+          "status": "open",
+          "side": "sell",
+          "user": "bob"
+        }
+      },
+      {
+        "transactionID": "0.40809971923762905",
+        "value": {
+          "id": 0.4453516187568676,
+          "price": 45.81208093633138,
+          "amount": 4.377739461490645,
+          "status": "open",
+          "side": "sell",
+          "user": "bob"
+        }
+      },
+      {
+        "transactionID": "0.8601966894792362",
+        "value": {
+          "id": 0.4453516187568676,
+          "price": 45.81208093633138,
+          "amount": 0,
+          "status": "sold",
+          "side": "sell",
+          "user": "bob"
+        }
+      }
+    ],
+    "/trades/0.02466078710245042": [
+      {
+        "transactionID": "0.0003834916282291446",
+        "value": {
+          "id": 0.02466078710245042,
+          "buyOrder": 0.5100409435201818,
+          "sellOrder": 0.4453516187568676,
+          "amount": 57.34558464712052,
+          "price": 53.01054052823274
+        }
+      }
+    ],
+    "/orders/0.8652590050969823": [
+      {
+        "transactionID": "0.6062274799740198",
+        "value": {
+          "id": 0.8652590050969823,
+          "price": 40.85953444322528,
+          "amount": 5.2026452545101245,
+          "side": "buy",
+          "status": "open",
+          "user": "alice"
+        }
+      },
+      {
+        "transactionID": "0.2855238856612927",
+        "value": {
+          "id": 0.8652590050969823,
+          "price": 40.85953444322528,
+          "amount": 0,
+          "status": "sold",
+          "side": "buy",
+          "user": "alice"
+        }
+      }
+    ],
+    "/orders/0.6594613051595737": [
+      {
+        "transactionID": "0.8863366133406168",
+        "value": {
+          "id": 0.6594613051595737,
+          "price": 50.936840475478064,
+          "amount": 22.160465058088736,
+          "side": "sell",
+          "status": "open",
+          "user": "alice"
+        }
+      },
+      {
+        "transactionID": "0.8601966894792362",
+        "value": {
+          "id": 0.6594613051595737,
+          "price": 50.936840475478064,
+          "amount": 0,
+          "status": "sold",
+          "side": "sell",
+          "user": "alice"
+        }
+      }
+    ],
+    "/orders/0.4738564640040104": [
+      {
+        "transactionID": "0.02466078710245042",
+        "value": {
+          "id": 0.4738564640040104,
+          "price": 33.81343161111086,
+          "amount": 13.419040444697291,
+          "side": "buy",
+          "status": "open",
+          "user": "bob"
+        }
+      },
+      {
+        "transactionID": "0.2855238856612927",
+        "value": {
+          "id": 0.4738564640040104,
+          "price": 33.81343161111086,
+          "amount": 0,
+          "status": "sold",
+          "side": "buy",
+          "user": "bob"
+        }
+      }
+    ],
+    "/orders/0.2643711262050747": [
+      {
+        "transactionID": "0.3051861941862723",
+        "value": {
+          "id": 0.2643711262050747,
+          "price": 43.23453176136551,
+          "amount": 3.453515426678132,
+          "side": "buy",
+          "status": "open",
+          "user": "bob"
+        }
+      },
+      {
+        "transactionID": "0.2855238856612927",
+        "value": {
+          "id": 0.2643711262050747,
+          "price": 43.23453176136551,
+          "amount": 0,
+          "status": "sold",
+          "side": "buy",
+          "user": "bob"
+        }
+      }
+    ],
+    "/orders/0.9319858592301475": [
+      {
+        "transactionID": "0.40809971923762905",
+        "value": {
+          "id": 0.9319858592301475,
+          "price": 61.90427058553721,
+          "amount": 30.009038122379255,
+          "side": "buy",
+          "status": "open",
+          "user": "alice"
+        }
+      },
+      {
+        "transactionID": "0.40809971923762905",
+        "value": {
+          "id": 0.9319858592301475,
+          "price": 61.90427058553721,
+          "amount": 0,
+          "status": "sold",
+          "side": "buy",
+          "user": "alice"
+        }
+      }
+    ],
+    "/trades/0.8863366133406168": [
+      {
+        "transactionID": "0.40809971923762905",
+        "value": {
+          "id": 0.8863366133406168,
+          "buyOrder": 0.9319858592301475,
+          "sellOrder": 0.4453516187568676,
+          "amount": 30.009038122379255,
+          "price": 53.858175760934294
+        }
+      }
+    ],
+    "/orders/0.7999519010073989": [
+      {
+        "transactionID": "0.2855238856612927",
+        "value": {
+          "id": 0.7999519010073989,
+          "price": 26.76166373003429,
+          "amount": 62.511260865732346,
+          "side": "sell",
+          "status": "open",
+          "user": "bob"
+        }
+      },
+      {
+        "transactionID": "0.2855238856612927",
+        "value": {
+          "id": 0.7999519010073989,
+          "price": 26.76166373003429,
+          "amount": 59.057745439054216,
+          "status": "open",
+          "side": "sell",
+          "user": "bob"
+        }
+      },
+      {
+        "transactionID": "0.2855238856612927",
+        "value": {
+          "id": 0.7999519010073989,
+          "price": 26.76166373003429,
+          "amount": 57.30861561122222,
+          "status": "open",
+          "side": "sell",
+          "user": "bob"
+        }
+      },
+      {
+        "transactionID": "0.2855238856612927",
+        "value": {
+          "id": 0.7999519010073989,
+          "price": 26.76166373003429,
+          "amount": 49.09222042103505,
+          "status": "open",
+          "side": "sell",
+          "user": "bob"
+        }
+      },
+      {
+        "transactionID": "0.10559463277980186",
+        "value": {
+          "id": 0.7999519010073989,
+          "price": 26.76166373003429,
+          "amount": 8.353928996579661,
+          "status": "open",
+          "side": "sell",
+          "user": "bob"
+        }
+      },
+      {
+        "transactionID": "0.8601966894792362",
+        "value": {
+          "id": 0.7999519010073989,
+          "price": 26.76166373003429,
+          "amount": 0,
+          "status": "sold",
+          "side": "sell",
+          "user": "bob"
+        }
+      }
+    ],
+    "/trades/0.7916017969060706": [
+      {
+        "transactionID": "0.2855238856612927",
+        "value": {
+          "id": 0.7916017969060706,
+          "buyOrder": 0.2643711262050747,
+          "sellOrder": 0.7999519010073989,
+          "amount": 3.453515426678132,
+          "price": 34.9980977456999
+        }
+      }
+    ],
+    "/trades/0.45140223107431293": [
+      {
+        "transactionID": "0.2855238856612927",
+        "value": {
+          "id": 0.45140223107431293,
+          "buyOrder": 0.8652590050969823,
+          "sellOrder": 0.7999519010073989,
+          "amount": 5.2026452545101245,
+          "price": 33.810599086629786
+        }
+      }
+    ],
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+    "/orders/0.3257611713612091": [
+      {
+        "transactionID": "0.8601966894792362",
+        "value": {
+          "id": 0.3257611713612091,
+          "price": 82.06709235167791,
+          "amount": 72.08794352792943,
+          "side": "buy",
+          "status": "open",
+          "user": "bob"
+        }
+      }
+    ],
+    "/orders/0.08347707994606074": [
+      {
+        "transactionID": "0.06801234424860435",
+        "value": {
+          "id": 0.08347707994606074,
+          "price": 51.974749287566866,
+          "amount": 84.354850635263,
+          "side": "buy",
+          "status": "open",
+          "user": "bob"
+        }
+      }
+    ],
+    "/orders/0.06411381118382682": [
+      {
+        "transactionID": "0.9992898264893236",
+        "value": {
+          "id": 0.06411381118382682,
+          "price": 15.311881075903663,
+          "amount": 72.79795987792123,
+          "side": "buy",
+          "status": "open",
+          "user": "bob"
+        }
+      }
+    ]
+  }
+}
diff --git a/apps/actors/systems/kvSync/examples/commodityMarket.tsx b/apps/actors/systems/kvSync/examples/commodityMarket.tsx
new file mode 100644
index 00000000..55f018fc
--- /dev/null
+++ b/apps/actors/systems/kvSync/examples/commodityMarket.tsx
@@ -0,0 +1,328 @@
+import React, { useState } from "react";
+import { KVApp } from "./types";
+import {
+  MutationCtx,
+  MutationInvocation,
+  TSMutationDefns,
+  UserInput,
+  WriteOp,
+} from "../types";
+import { Client, makeClient, useLiveQuery } from "../hooks";
+import { ChooseFn, UIProps } from "../../../types";
+import { ClientState, QueryStatus, TransactionState } from "../client";
+import { LoginWrapper } from "../uiCommon/loginWrapper";
+import { Inspector } from "../uiCommon/inspector";
+import { Table } from "../../../../../uiCommon/generic/table";
+import { LoggedInHeader } from "../uiCommon/loggedInHeader";
+import { Json } from "../../../../../util/json";
+import { randomFromList, randStep2 } from "../../../../../util/util";
+
+function MarketUI(props: UIProps<ClientState, UserInput>) {
+  const client = makeClient(props);
+
+  return (
+    <LoginWrapper
+      client={client}
+      loggedIn={(user) => <MarketInner client={client} user={user} />}
+    />
+  );
+}
+
+function MarketInner(props: { client: Client; user: string }) {
+  const [orders, orderQueryStatus] = useOrders(props.client);
+  const [trades, tradeQueryStatus] = useTrades(props.client);
+
+  return (
+    <>
+      <LoggedInHeader user={props.user} client={props.client}>
+        <h2>Market</h2>
+      </LoggedInHeader>
+
+      <h3>Orders</h3>
+
+      {orderQueryStatus === "Loading" ? (
+        <em>Loading...</em>
+      ) : (
+        <Table<Order>
+          data={orders}
+          getKey={(order) => order.id.toString()}
+          columns={[
+            { name: "id", render: (order) => order.id },
+            { name: "price", render: (order) => `$${order.price}` },
+            { name: "amount", render: (order) => order.amount },
+            { name: "side", render: (order) => order.side },
+            { name: "user", render: (order) => order.user },
+            { name: "status", render: (order) => order.status },
+          ]}
+        />
+      )}
+
+      <h3>Create Order</h3>
+
+      <OrderForm client={props.client} />
+
+      <h3>Trades</h3>
+
+      {tradeQueryStatus === "Loading" ? (
+        <em>Loading...</em>
+      ) : (
+        <Table<Trade>
+          data={trades}
+          getKey={(trade) => trade.id.toString()}
+          columns={[
+            { name: "id", render: (trade) => trade.id },
+            { name: "price", render: (trade) => `$${trade.price}` },
+            { name: "amount", render: (trade) => trade.amount },
+            { name: "buy order", render: (trade) => trade.buyOrder },
+            { name: "sell order", render: (trade) => trade.sellOrder },
+          ]}
+        />
+      )}
+
+      <Inspector client={props.client} />
+    </>
+  );
+}
+
+function OrderForm(props: { client: Client }) {
+  const [price, setPrice] = useState(10);
+  const [amount, setAmount] = useState(100);
+  const [side, setSide] = useState<OrderSide>("buy");
+
+  return (
+    <form
+      onSubmit={(evt) => {
+        evt.preventDefault();
+
+        props.client.runMutation("Order", [price, amount, side]);
+      }}
+    >
+      Amount:{" "}
+      <input
+        type="number"
+        placeholder="Amount"
+        value={amount}
+        onChange={(evt) => setAmount(parseInt(evt.target.value))}
+      />{" "}
+      Price:{" "}
+      <input
+        type="number"
+        placeholder="Price"
+        value={price}
+        onChange={(evt) => setPrice(parseInt(evt.target.value))}
+      />
+      <div>
+        <label>
+          <input
+            type="radio"
+            value="buy"
+            checked={side === "buy"}
+            onChange={(evt) => setSide("buy")}
+          />
+          Buy
+        </label>
+        <label>
+          <input
+            type="radio"
+            value="sell"
+            checked={side === "sell"}
+            onChange={(evt) => setSide("sell")}
+          />
+          Sell
+        </label>
+      </div>
+      <button type="submit">Create Order</button>
+    </form>
+  );
+}
+
+type OfferStatus = "open" | "sold";
+
+type OrderSide = "sell" | "buy";
+
+type Order = {
+  id: number;
+  price: number;
+  amount: number;
+  side: OrderSide;
+  user: string;
+  status: OfferStatus;
+};
+
+type Trade = {
+  id: number;
+  price: number;
+  amount: number;
+  buyOrder: number;
+  sellOrder: number;
+};
+
+type OrderWithState = Order & { state: TransactionState };
+
+function useOrders(client: Client): [OrderWithState[], QueryStatus] {
+  const [rawOrders, queryStatus] = useLiveQuery(client, "list-orders", {
+    prefix: "/orders/",
+  });
+
+  const orders = Object.entries(rawOrders).map(
+    ([id, rawOrder]): OrderWithState => {
+      const order = rawOrder.value as any;
+      const mapped = readOrder(order);
+      return {
+        ...mapped,
+        state: client.state.transactions[rawOrder.transactionID]?.state,
+      };
+    }
+  );
+
+  return [orders, queryStatus];
+}
+
+function readOrder(rawOrder: Json): Order {
+  const order = rawOrder as any;
+  return {
+    id: order.id as number,
+    price: order.price as number,
+    amount: order.amount as number,
+    status: order.status as OfferStatus,
+    side: order.side as OrderSide,
+    user: order.user as string,
+  };
+}
+
+function useTrades(client: Client): [Trade[], QueryStatus] {
+  const [rawTrades, queryStatus] = useLiveQuery(client, "list-trades", {
+    prefix: "/trades/",
+  });
+
+  const trades = Object.entries(rawTrades).map(([id, rawTrade]): Trade => {
+    const trade = rawTrade.value as any;
+    return readTrade(trade);
+  });
+
+  return [trades, queryStatus];
+}
+
+function readTrade(rawTrade: Json): Trade {
+  const trade = rawTrade as any;
+  return {
+    id: trade.id as number,
+    price: trade.price as number,
+    amount: trade.amount as number,
+    buyOrder: trade.buyOrder as number,
+    sellOrder: trade.sellOrder as number,
+  };
+}
+
+const mutations: TSMutationDefns = {
+  Order: (ctx, [price, amount, side]) => {
+    const id = ctx.rand();
+    ctx.write(`/orders/${id}`, {
+      id,
+      price,
+      amount,
+      side,
+      status: "open",
+      user: ctx.curUser,
+    });
+  },
+};
+
+function matchOrders(ctx: MutationCtx, evt: WriteOp) {
+  // Prevent us from going on forever
+  if (evt.desc.type !== "Insert") {
+    return;
+  }
+
+  const orders = ctx.scan("/orders/").map(readOrder);
+
+  const buys = orders
+    .filter((order) => order.side === "buy" && order.status === "open")
+    .sort((a, b) => b.price - a.price);
+  const sells = orders
+    .filter((order) => order.side === "sell" && order.status === "open")
+    .sort((a, b) => a.price - b.price);
+
+  for (const buy of buys) {
+    // TODO: keep buying while there's more to buy
+    for (const sell of sells) {
+      if (buy.price >= sell.price) {
+        const amount = Math.min(buy.amount, sell.amount);
+        const price = (buy.price + sell.price) / 2;
+
+        // Execute the trade
+        const newBuyAmount = buy.amount - amount;
+        const newBuy: Order = {
+          ...buy,
+          amount: newBuyAmount,
+          status: newBuyAmount === 0 ? "sold" : "open",
+        };
+        ctx.write(`/orders/${buy.id}`, newBuy);
+
+        const newSellAmount = sell.amount - amount;
+        const newSell: Order = {
+          ...sell,
+          amount: newSellAmount,
+          status: newSellAmount === 0 ? "sold" : "open",
+        };
+        ctx.write(`/orders/${sell.id}`, newSell);
+
+        // console.log("matchOrders", { newBuy, newSell });
+
+        const tradeID = ctx.rand();
+        ctx.write(`/trades/${tradeID}`, {
+          id: tradeID,
+          buyOrder: buy.id,
+          sellOrder: sell.id,
+          amount,
+          price,
+        });
+
+        if (newBuyAmount === 0) {
+          break;
+        }
+      }
+    }
+  }
+}
+
+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: [price * 100, amount1 * 100, side],
+      },
+    },
+    randomSeed3,
+  ];
+}
+
+export const commodityMarket: KVApp = {
+  name: "Commodity Market",
+  mutations,
+  ui: MarketUI,
+  triggers: [
+    {
+      prefix: "/orders/",
+      fn: matchOrders,
+    },
+  ],
+  choose,
+};
diff --git a/apps/actors/systems/kvSync/examples/index.ts b/apps/actors/systems/kvSync/examples/index.ts
index 63801f10..c0e10776 100644
--- a/apps/actors/systems/kvSync/examples/index.ts
+++ b/apps/actors/systems/kvSync/examples/index.ts
@@ -2,13 +2,15 @@ import { bank } from "./bank";
 import { chat } from "./chat";
 import { counter } from "./counter";
 import { todoMVC } from "./todoMVC";
-import { market } from "./market";
+import { itemMarket } from "./itemMarket";
 import { KVApp } from "./types";
+import { commodityMarket } from "./commodityMarket";
 
 export const EXAMPLES: { [name: string]: KVApp } = {
   bank,
   chat,
   counter,
   todoMVC,
-  market,
+  itemMarket,
+  commodityMarket,
 };
diff --git a/apps/actors/systems/kvSync/examples/market.tsx b/apps/actors/systems/kvSync/examples/itemMarket.tsx
similarity index 95%
rename from apps/actors/systems/kvSync/examples/market.tsx
rename to apps/actors/systems/kvSync/examples/itemMarket.tsx
index 81ecbeb9..1f24a5bf 100644
--- a/apps/actors/systems/kvSync/examples/market.tsx
+++ b/apps/actors/systems/kvSync/examples/itemMarket.tsx
@@ -36,7 +36,7 @@ function MarketInner(props: { client: Client; user: string }) {
       ) : (
         <Table<Offer>
           data={offers}
-          getKey={(offer) => offer.item}
+          getKey={(offer) => offer.id.toString()}
           columns={[
             { name: "item", render: (offer) => offer.item },
             { name: "price", render: (offer) => offer.price },
@@ -110,7 +110,7 @@ type Offer = {
 };
 
 function useOffers(client: Client): [Offer[], QueryStatus] {
-  const [rawOffers, queryStatus] = useLiveQuery(client, "list-todos", {
+  const [rawOffers, queryStatus] = useLiveQuery(client, "list-offers", {
     prefix: "/offers/",
   });
 
@@ -150,8 +150,8 @@ const mutations: TSMutationDefns = {
   },
 };
 
-export const market: KVApp = {
-  name: "Market",
+export const itemMarket: KVApp = {
+  name: "Item Market",
   mutations,
   ui: MarketUI,
 };
diff --git a/apps/actors/systems/kvSync/examples/types.ts b/apps/actors/systems/kvSync/examples/types.ts
index 52d0a7c5..721c6b3b 100644
--- a/apps/actors/systems/kvSync/examples/types.ts
+++ b/apps/actors/systems/kvSync/examples/types.ts
@@ -1,18 +1,25 @@
 import { UIProps } from "../../../types";
 import { ClientState } from "../client";
-import { MutationInvocation, TSMutationDefns, UserInput } from "../types";
+import {
+  MutationInvocation,
+  TriggerDefn,
+  TSMutationDefns,
+  UserInput,
+} from "../types";
 
-type ChooseFn = (
+export type ChooseFn = (
   clients: {
     [id: string]: ClientState;
   },
   randomSeed: number
 ) => [{ clientID: string; invocation: MutationInvocation } | null, number];
 
+// TODO: move to other types file?
 export type KVApp = {
   name: string;
   mutations: TSMutationDefns;
   initialKVPairs?: {};
   ui: (props: UIProps<ClientState, UserInput>) => React.ReactElement;
   choose?: ChooseFn;
+  triggers?: TriggerDefn[];
 };
diff --git a/apps/actors/systems/kvSync/index.ts b/apps/actors/systems/kvSync/index.ts
index a591e106..a8b76bb8 100644
--- a/apps/actors/systems/kvSync/index.ts
+++ b/apps/actors/systems/kvSync/index.ts
@@ -28,7 +28,7 @@ export function makeActorSystem(app: KVApp): System<KVSyncState, KVSyncMsg> {
     state: KVSyncState,
     init: LoadedTickInitiator<KVSyncState, KVSyncMsg>
   ) => {
-    return update(app.mutations, state, init);
+    return update(app, state, init);
   };
   return {
     name: `KV: ${app.name}`,
@@ -74,20 +74,20 @@ function kvSyncChooseMove(app: KVApp): ChooseFn<KVSyncState, KVSyncMsg> {
 }
 
 export function update(
-  mutations: TSMutationDefns,
+  app: KVApp,
   state: KVSyncState,
   init: LoadedTickInitiator<KVSyncState, KVSyncMsg>
 ): ActorResp<KVSyncState, KVSyncMsg> {
   switch (state.type) {
     case "ClientState":
       return updateClient(
-        mutations,
+        app.mutations,
         state,
         init as LoadedTickInitiator<ClientState, MsgToClient>
       );
     case "ServerState":
       return updateServer(
-        mutations,
+        app,
         state,
         init as LoadedTickInitiator<ServerState, MsgToServer>
       );
diff --git a/apps/actors/systems/kvSync/mvcc.ts b/apps/actors/systems/kvSync/mvcc.ts
index 1f4156a0..9827fa7c 100644
--- a/apps/actors/systems/kvSync/mvcc.ts
+++ b/apps/actors/systems/kvSync/mvcc.ts
@@ -27,8 +27,8 @@ export function addNewVersion(
   // Check if the transactionID is already in the list
   // This can result from overlapping live queries
   // TODO: this is O(n) and could be O(1)
-  if (versions.some((v) => v.transactionID === newVersion.transactionID)) {
-    return versions;
-  }
+  // if (versions.some((v) => v.transactionID === newVersion.transactionID)) {
+  //   return versions;
+  // }
   return [...versions, newVersion];
 }
diff --git a/apps/actors/systems/kvSync/server.ts b/apps/actors/systems/kvSync/server.ts
index 37dfedd4..8dfc9613 100644
--- a/apps/actors/systems/kvSync/server.ts
+++ b/apps/actors/systems/kvSync/server.ts
@@ -11,7 +11,6 @@ import {
   MutationResponse,
   Query,
   TransactionMetadata,
-  TSMutationDefns,
   WriteOp,
 } from "./types";
 import * as effects from "../../effects";
@@ -19,6 +18,7 @@ import { filterMap, mapObj, randStep2, removeKey } from "../../../../util/util";
 import { Json, jsonEq } from "../../../../util/json";
 import { keyInQuery, runQuery } from "./query";
 import { MutationContextImpl } from "./common";
+import { KVApp } from "./examples/types";
 
 export type ServerState = {
   type: "ServerState";
@@ -86,12 +86,13 @@ function processLiveQueryRequest(
 }
 
 function runMutationOnServer(
-  mutationDefns: TSMutationDefns,
+  app: KVApp,
   state: ServerState,
   user: string,
   req: MutationRequest,
   clientID: string
 ): [ServerState, MutationResponse, LiveQueryUpdate[]] {
+  const mutationDefns = app.mutations;
   const isTxnCommitted = (txnID: string) => true;
   const txnTime = state.time;
 
@@ -134,16 +135,6 @@ function runMutationOnServer(
     throw e;
   }
 
-  const newState: ServerState = {
-    ...state,
-    time: state.time + 1,
-    randSeed: ctx.randState,
-    transactionMetadata: {
-      ...state.transactionMetadata,
-      [req.txnID]: { serverTimestamp: txnTime, invocation: req.invocation },
-    },
-    data: ctx.kvData,
-  };
   if (!jsonEq(ctx.trace, req.trace)) {
     console.warn("SERVER: rejecting txn due to trace mismatch", {
       serverTrace: ctx.trace,
@@ -167,23 +158,42 @@ function runMutationOnServer(
       [],
     ];
   }
+
+  // run triggers
+  runTriggers(app, ctx);
+
+  const newState: ServerState = {
+    ...state,
+    time: state.time + 1,
+    randSeed: ctx.randState,
+    transactionMetadata: {
+      ...state.transactionMetadata,
+      [req.txnID]: { serverTimestamp: txnTime, invocation: req.invocation },
+    },
+    data: ctx.kvData,
+  };
+
   // live query updates
-  const writes: WriteOp[] = ctx.trace.filter(
-    (op) => op.type === "Write"
-  ) as WriteOp[];
+  const writes: WriteOp[] = getJustWrites(ctx);
+
+  // console.log("live queries for writes", writes);
+
   const liveQueryUpdates: LiveQueryUpdate[] = filterMap(
     state.liveQueries,
     (liveQuery) => {
       const matchingWrites = writes.filter((write) =>
         keyInQuery(write.key, liveQuery.query)
       );
+
+      // console.log("matching writes", liveQuery, matchingWrites);
+
       if (matchingWrites.length === 0) {
         return null;
       }
       // skip originating client
-      if (liveQuery.clientID === clientID) {
-        return null;
-      }
+      // if (liveQuery.clientID === clientID) {
+      //   return null;
+      // }
 
       return {
         type: "LiveQueryUpdate",
@@ -214,9 +224,40 @@ function runMutationOnServer(
   ];
 }
 
+const MAX_ITERS = 100;
+
+function runTriggers(app: KVApp, ctx: MutationContextImpl) {
+  let iters = 0;
+  const queue: WriteOp[] = getJustWrites(ctx);
+  while (queue.length > 0) {
+    if (iters > MAX_ITERS) {
+      throw new Error("Infinite loop in triggers");
+    }
+
+    const op = queue.shift();
+    const lengthBefore = getJustWrites(ctx).length;
+
+    for (const trigger of app.triggers || []) {
+      if (op.key.startsWith(trigger.prefix)) {
+        trigger.fn(ctx, op);
+      }
+    }
+
+    const newTriggers = getJustWrites(ctx).slice(lengthBefore);
+    for (const trigger of newTriggers) {
+      queue.push(trigger);
+    }
+    iters++;
+  }
+}
+
+function getJustWrites(ctx: MutationContextImpl): WriteOp[] {
+  return ctx.trace.filter((op) => op.type === "Write") as WriteOp[];
+}
+
 // TODO: maybe move this out to index.ts? idk
 export function updateServer(
-  mutations: TSMutationDefns,
+  app: KVApp,
   state: ServerState,
   init: LoadedTickInitiator<ServerState, MsgToServer>
 ): ActorResp<ServerState, MsgToClient> {
@@ -289,12 +330,13 @@ export function updateServer(
             }
             case "MutationRequest": {
               const [newState, mutationResp, updates] = runMutationOnServer(
-                mutations,
+                app,
                 state,
                 user,
                 innerMsg,
                 init.from
               );
+
               const outgoing: OutgoingMessage<MsgToClient>[] = [
                 { to: init.from, msg: mutationResp },
                 ...updates.map((update) => ({
diff --git a/apps/actors/systems/kvSync/types.ts b/apps/actors/systems/kvSync/types.ts
index 350a1451..b826017f 100644
--- a/apps/actors/systems/kvSync/types.ts
+++ b/apps/actors/systems/kvSync/types.ts
@@ -94,6 +94,7 @@ export type MutationCtx = {
   curUser: string;
   rand: () => number;
   read: (key: string, _default?: Json) => Json;
+  scan: (prefix: string) => Json[];
   write: (key: string, value: Json) => void;
 };
 
@@ -198,3 +199,12 @@ export type MutationInvocation = {
   name: string;
   args: Json[];
 };
+
+// Triggers
+
+type TriggerFn = (ctx: MutationCtx, evt: WriteOp) => void;
+
+export type TriggerDefn = {
+  prefix: string;
+  fn: TriggerFn;
+};
diff --git a/apps/actors/systems/kvSync/uiCommon/kvInspector.tsx b/apps/actors/systems/kvSync/uiCommon/kvInspector.tsx
index cf9d8bad..d5f8d16a 100644
--- a/apps/actors/systems/kvSync/uiCommon/kvInspector.tsx
+++ b/apps/actors/systems/kvSync/uiCommon/kvInspector.tsx
@@ -34,7 +34,7 @@ export function KVInspector(props: {
         {
           name: "Statuses",
           render: ([key, vvs]) =>
-            vvs.map((vv) => (
+            vvs.map((vv, idx) => (
               // TODO: clicking on this should show the txn trace
               <span
                 title={vv.transactionID}
@@ -45,7 +45,8 @@ export function KVInspector(props: {
                       ? "underline"
                       : "none",
                 }}
-                key={vv.transactionID}
+                // TODO: currently there can be multiple writes with the same txn id
+                key={`${vv.transactionID}-${idx}`}
                 onClick={() => props.onSelectTxn(vv.transactionID)}
               >
                 {iconForState(
diff --git a/apps/actors/systems/kvSync/uiCommon/loginWrapper.tsx b/apps/actors/systems/kvSync/uiCommon/loginWrapper.tsx
index d657539f..f5c1e94f 100644
--- a/apps/actors/systems/kvSync/uiCommon/loginWrapper.tsx
+++ b/apps/actors/systems/kvSync/uiCommon/loginWrapper.tsx
@@ -39,6 +39,7 @@ function LoginSignupForm(props: { client: Client }) {
           <input
             type="text"
             value={username}
+            autoComplete="off"
             onChange={(evt) => setUsername(evt.target.value)}
           />
         </p>
@@ -48,6 +49,7 @@ function LoginSignupForm(props: { client: Client }) {
           <input
             type="password"
             value={password}
+            autoComplete="off"
             onChange={(evt) => setPassword(evt.target.value)}
           />
         </p>