feat: skip unsafe foreign contract calls

tools/contract-as-class.js

@@ -0,0 +1,118 @@
+const {ObjectState} = require('object-rollback');
+
+class SmartWeaveGlobal {
+  get owner() {
+    return 'ppe';
+  }
+}
+
+// base contract that must be extended by all contracts
+// - contains methods for commit/rollback the state
+class JsWarpContract {
+  state
+  smartweave
+  #objectState
+
+  constructor(state, smartweave) {
+    this.state = state;
+    this.#objectState = new ObjectState(state);
+    this.smartweave = smartweave;
+  }
+
+  // to be called by SDK
+  get currentState() {
+    return JSON.parse(JSON.stringify(this.state));
+  }
+
+  // to be called by SDK
+  commit() {
+    this.#objectState = new ObjectState(this.state);
+  }
+
+  // to be called by SDK
+  rollback() {
+    this.#objectState.rollback();
+  }
+}
+
+// example contract
+class WarpPst extends JsWarpContract {
+  constructor(initialState, smartweave) {
+    super(initialState, smartweave);
+  }
+
+  transfer(target, qty) {
+    this.#transfer(target, qty);
+  }
+
+  transferAndThrow(target, qty) {
+    this.#transfer(target, qty);
+    throw new Error('Oops!');
+  }
+
+  #transfer(target, qty) {
+    if (!Reflect.has(this.state.balances, target)) {
+      this.state.balances[target] = 0;
+    }
+    this.state.balances[target] += qty;
+    this.state.balances[this.smartweave.owner] -= qty;
+  }
+}
+
+
+function main() {
+  // contract instance
+  const pst = new WarpPst({
+    name: 'just_ppe',
+    ticker: 'ppe',
+    balances: {
+      ppe: 100000000
+    }
+  }, new SmartWeaveGlobal());
+
+  const interactions = [
+    {
+      id: "1",
+      function: 'transfer',
+      args: {
+        target: 'jzi',
+        qty: 100
+      }
+    },
+    {
+      id: "2",
+      function: 'transfer',
+      args: {
+        target: 'jwo',
+        qty: 200
+      }
+    },
+    {
+      id: "3",
+      function: 'transferAndThrow',
+      args: {
+        target: 'xyz',
+        qty: 300
+      }
+    }
+  ];
+
+  console.log('State before', pst.currentState);
+
+  // sdk code
+  interactions.forEach((i) => {
+    try {
+      Reflect.get(pst, i.function).apply(pst, [i.args.target, i.args.qty]);
+      console.log(`State after ${i.id}`, pst.currentState);
+      pst.commit();
+    } catch (e) {
+      console.error(e.message);
+      pst.rollback();
+    }
+  });
+
+  console.log(`End state`, pst.currentState);
+}
+
+main();
+