Fix opcode global CallerApplicationID

CHANGELOG.md

@@ -62,6 +62,7 @@ from `algosdk` and sends it to the network.
 - Fix `gitxna 1 Logs 0` opcode. Previously any attempt to use this opcode would result in a "Not supported" error.
 - Fix `TxParams.noteb64` encoding - should use base64 decoder rather than TextEncoder.
 - Fix `ed25519verify` opcode implementation. Previously the signature was only checked against the data not the concatenation of "ProgData"||program||data. Additionally test scenarios was added to check the correct implementation. 
+- Fix `global CallerApplicationID` opcode. Previously the opcode get the wrong caller application ID. 
 
 ### Breaking Changes
 

packages/runtime/src/ctx.ts

@@ -215,6 +215,7 @@ export class Ctx implements Context {
 
 	getCallerApplicationID(): number {
 		let callerApplicationID = 0;
+		// the top value in the `innerTxAppIDCallStack` is the own appID not the caller appID
 		if (this.innerTxAppIDCallStack.length > 1) {
 			callerApplicationID = this.innerTxAppIDCallStack[this.innerTxAppIDCallStack.length - 2];
 		}

packages/runtime/test/src/interpreter/opcode-list.ts

@@ -3039,10 +3039,10 @@ describe("Teal Opcodes", function () {
 				interpreter.runtime.ctx.innerTxAppIDCallStack = [1, 2];
 			});
 			it("Tealv6: CalllerApplicationAddress", function () {
-				// caller app id = 2
+				// caller app id = 1
 				const op = new Global(["CallerApplicationAddress"], 1, interpreter);
 				op.execute(stack);
-				assert.deepEqual(decodeAddress(getApplicationAddress(2n)).publicKey, stack.pop());
+				assert.deepEqual(decodeAddress(getApplicationAddress(1n)).publicKey, stack.pop());
 
 				// no caller
 				interpreter.runtime.ctx.innerTxAppIDCallStack = [];
@@ -3051,10 +3051,10 @@ describe("Teal Opcodes", function () {
 			});
 
 			it("Tealv6: CallerApplicationID", function () {
-				// caller app id = 2
+				// caller app id = 1
 				const op = new Global(["CallerApplicationID"], 1, interpreter);
 				op.execute(stack);
-				assert.equal(2n, stack.pop());
+				assert.equal(1n, stack.pop());
 
 				// no caller
 				interpreter.runtime.ctx.innerTxAppIDCallStack = [];