Remove non-lock alternative, add cleanup, create pre-mint alternative - erc20-vend - Create ERC20 tokens the can be minted by existing ERC20 token balance

commit f47e9b96e87de5c2dbc5343156ab5349c5d3e613
parent 4e5ca4f62f9ff6febbf2dd0898b7f5078c4faea1
Author: lash <dev@holbrook.no>
Date:   Sun,  7 May 2023 16:20:56 +0100

Remove non-lock alternative, add cleanup, create pre-mint alternative

Diffstat:
M python/erc20_vend/data/Vend.bin  | 4 ++--
M python/erc20_vend/data/Vend.json  | 2 +-
M python/erc20_vend/data/Vend.metadata.json  | 2 +-
M python/erc20_vend/unittest/base.py  | 4 ++--
M python/erc20_vend/vend.py  | 12 ++++++------
M python/tests/test_base.py  | 49 ++++++++++++++++++++++++++++++++++++++++++++++---
M python/tests/test_events.py  | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
D python/tests/test_lock.py  | 107 -------------------------------------------------------------------------------
A python/tests/test_supply.py  | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M solidity/Vend.sol  | 132 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------------------

10 files changed, 316 insertions(+), 157 deletions(-)
diff --git a/python/erc20_vend/data/Vend.bin b/python/erc20_vend/data/Vend.bin
@@ -1 +1 @@
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+\ No newline at end of file
diff --git a/python/erc20_vend/data/Vend.json b/python/erc20_vend/data/Vend.json
@@ -1 +1 @@
-[{"inputs":[{"internalType":"address","name":"_controlToken","type":"address"},{"internalType":"uint8","name":"_decimals","type":"uint8"},{"internalType":"bool","name":"_lock","type":"bool"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"_idx","type":"uint256"},{"indexed":false,"internalType":"address","name":"_token","type":"address"}],"name":"TokenCreated","type":"event"},{"inputs":[{"internalType":"string","name":"_name","type":"string"},{"internalType":"string","name":"_symbol","type":"string"}],"name":"create","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_idx","type":"uint256"}],"name":"getTokenByIndex","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"mintFor","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"withdrawFor","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"}]
+[{"inputs":[{"internalType":"address","name":"_controlToken","type":"address"},{"internalType":"uint8","name":"_decimals","type":"uint8"},{"internalType":"bool","name":"_mint","type":"bool"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"_idx","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"_supply","type":"uint256"},{"indexed":false,"internalType":"address","name":"_token","type":"address"}],"name":"TokenCreated","type":"event"},{"inputs":[{"internalType":"address","name":"_minter","type":"address"}],"name":"addWriter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"clean","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"_name","type":"string"},{"internalType":"string","name":"_symbol","type":"string"}],"name":"create","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_minter","type":"address"}],"name":"deleteWriter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"getFor","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_idx","type":"uint256"}],"name":"getTokenByIndex","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_minter","type":"address"}],"name":"isWriter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"_sum","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"withdrawFor","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"}]
diff --git a/python/erc20_vend/data/Vend.metadata.json b/python/erc20_vend/data/Vend.metadata.json
@@ -1 +1 @@
-{"compiler":{"version":"0.8.19+commit.7dd6d404"},"language":"Solidity","output":{"abi":[{"inputs":[{"internalType":"address","name":"_controlToken","type":"address"},{"internalType":"uint8","name":"_decimals","type":"uint8"},{"internalType":"bool","name":"_lock","type":"bool"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"_idx","type":"uint256"},{"indexed":false,"internalType":"address","name":"_token","type":"address"}],"name":"TokenCreated","type":"event"},{"inputs":[{"internalType":"string","name":"_name","type":"string"},{"internalType":"string","name":"_symbol","type":"string"}],"name":"create","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_idx","type":"uint256"}],"name":"getTokenByIndex","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"mintFor","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"withdrawFor","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"}],"devdoc":{"kind":"dev","methods":{},"version":1},"userdoc":{"kind":"user","methods":{},"version":1}},"settings":{"compilationTarget":{"Vend.sol":"ERC20Vend"},"evmVersion":"byzantium","libraries":{},"metadata":{"bytecodeHash":"ipfs"},"optimizer":{"enabled":false,"runs":200},"remappings":[]},"sources":{"GiftableToken.sol":{"keccak256":"0xaa3263856dd73d7bb1ec06b4ca38dd86ddd0771e8cb2ca47b7c1e3c69be9c14a","license":"AGPL-3.0-or-later","urls":["bzz-raw://ddeb57c7ea151da4b52a95c6c12a225b54b80713c323821ea52f8c8ca295479c","dweb:/ipfs/QmZKwsNxRQFdQRjPsHP7RepfLtXDXhDEb3Qy2koPJdFoWG"]},"Vend.sol":{"keccak256":"0x7b5aea312830bd875fee47ab596648fb51a10bc4d27f65e2bb7bcc63d43e9496","license":"AGPL-3.0-or-later","urls":["bzz-raw://7692c21373cf253573df268aa6b80c9d83228345391bea4fbca14a0cedb508bb","dweb:/ipfs/QmbUxUuaz6ECoEKs99jzWcyvwjE111w9W8UN4qNEL8NwnH"]}},"version":1}
+{"compiler":{"version":"0.8.19+commit.7dd6d404"},"language":"Solidity","output":{"abi":[{"inputs":[{"internalType":"address","name":"_controlToken","type":"address"},{"internalType":"uint8","name":"_decimals","type":"uint8"},{"internalType":"bool","name":"_mint","type":"bool"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"_idx","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"_supply","type":"uint256"},{"indexed":false,"internalType":"address","name":"_token","type":"address"}],"name":"TokenCreated","type":"event"},{"inputs":[{"internalType":"address","name":"_minter","type":"address"}],"name":"addWriter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"clean","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"_name","type":"string"},{"internalType":"string","name":"_symbol","type":"string"}],"name":"create","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_minter","type":"address"}],"name":"deleteWriter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"getFor","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_idx","type":"uint256"}],"name":"getTokenByIndex","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_minter","type":"address"}],"name":"isWriter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"_sum","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"withdrawFor","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"}],"devdoc":{"kind":"dev","methods":{},"version":1},"userdoc":{"kind":"user","methods":{},"version":1}},"settings":{"compilationTarget":{"Vend.sol":"ERC20Vend"},"evmVersion":"byzantium","libraries":{},"metadata":{"bytecodeHash":"ipfs"},"optimizer":{"enabled":false,"runs":200},"remappings":[]},"sources":{"GiftableToken.sol":{"keccak256":"0xaa3263856dd73d7bb1ec06b4ca38dd86ddd0771e8cb2ca47b7c1e3c69be9c14a","license":"AGPL-3.0-or-later","urls":["bzz-raw://ddeb57c7ea151da4b52a95c6c12a225b54b80713c323821ea52f8c8ca295479c","dweb:/ipfs/QmZKwsNxRQFdQRjPsHP7RepfLtXDXhDEb3Qy2koPJdFoWG"]},"Vend.sol":{"keccak256":"0x64d539d4d363060e1ea38eb7812ed1786bfce0996e2571ed27aa3dea379cfbec","license":"AGPL-3.0-or-later","urls":["bzz-raw://59d229040c8fb38304113cfd4b40d6a0a87704e88df975a624f1775ffaff548b","dweb:/ipfs/QmNxar5xMx4YDqaHLtbCoKjJ9DRzRzCfnQtgHZhcPMW1En"]}},"version":1}
diff --git a/python/erc20_vend/unittest/base.py b/python/erc20_vend/unittest/base.py
@@ -35,10 +35,10 @@ class TestVendCore(TestGiftableToken):
         self.token_decimals = c.parse_decimals(r)
 
 
-    def publish(self, lock=False, decimals=0):
+    def publish(self, mint=False, decimals=0):
         nonce_oracle = RPCNonceOracle(self.accounts[0], conn=self.conn)
         c = Vend(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
-        (tx_hash, o) = c.constructor(self.accounts[0], self.token_address, lock=lock, decimals=decimals)
+        (tx_hash, o) = c.constructor(self.accounts[0], self.token_address, mint=mint, decimals=decimals)
         self.rpc.do(o)
         o = receipt(tx_hash)
         r = self.rpc.do(o)
diff --git a/python/erc20_vend/vend.py b/python/erc20_vend/vend.py
@@ -36,20 +36,20 @@ class Vend(TxFactory):
     __abi = None
     __bytecode = None
 
-    def constructor(self, sender_address, token_address, decimals=0, lock=False, tx_format=TxFormat.JSONRPC, version=None):
-        code = self.cargs(token_address, decimals=decimals, lock=lock, version=version)
+    def constructor(self, sender_address, token_address, decimals=0, mint=False, tx_format=TxFormat.JSONRPC, version=None):
+        code = self.cargs(token_address, decimals=decimals, mint=mint, version=version)
         tx = self.template(sender_address, None, use_nonce=True)
         tx = self.set_code(tx, code)
         return self.finalize(tx, tx_format)
 
 
     @staticmethod
-    def cargs(token_address, decimals=0, lock=False, version=None):
+    def cargs(token_address, decimals=0, mint=False, version=None):
         code = Vend.bytecode(version=version)
         enc = ABIContractEncoder()
         enc.address(token_address)
         enc.uintn(decimals, 8)
-        enc.bool(lock)
+        enc.bool(mint)
         args = enc.get()
         code += args
         logg.debug('constructor code: ' + args)
@@ -94,9 +94,9 @@ class Vend(TxFactory):
         return tx
 
 
-    def mint_for(self, contract_address, sender_address, token_address, tx_format=TxFormat.JSONRPC, id_generator=None):
+    def get_for(self, contract_address, sender_address, token_address, tx_format=TxFormat.JSONRPC, id_generator=None):
         enc = ABIContractEncoder()
-        enc.method('mintFor')
+        enc.method('getFor')
         enc.typ(ABIContractType.ADDRESS)
         enc.address(token_address)
         data = add_0x(enc.get())
diff --git a/python/tests/test_base.py b/python/tests/test_base.py
@@ -42,7 +42,6 @@ class TestVendBase(TestVend):
         symbol = c.parse_symbol(r)
         self.assertEqual(symbol, 'FOOVEND')
         
-    
     def test_vend_token(self):
         nonce_oracle = RPCNonceOracle(self.accounts[0], conn=self.conn)
         c = Vend(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
@@ -54,7 +53,7 @@ class TestVendBase(TestVend):
         vended_token_address = c.parse_token(r)
 
         vend_amount = 100
-        src_amount = vend_amount * (10 ** self.token_decimals)
+        src_amount = vend_amount * (10 ** (self.token_decimals))
         c = GiftableToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
         (tx_hash, o) = c.mint_to(self.token_address, self.accounts[0], self.alice, src_amount)
         self.rpc.do(o)
@@ -64,7 +63,21 @@ class TestVendBase(TestVend):
 
         nonce_oracle = RPCNonceOracle(self.alice, conn=self.conn)
         c = Vend(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
-        (tx_hash, o) = c.mint_for(self.vend_address, self.alice, vended_token_address)
+        (tx_hash, o) = c.get_for(self.vend_address, self.alice, vended_token_address)
+        self.rpc.do(o)
+        o = receipt(tx_hash)
+        r = self.rpc.do(o)
+        self.assertEqual(r['status'], 0)
+
+        c = ERC20(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
+        (tx_hash, o) = c.approve(self.token_address, self.alice, self.vend_address, src_amount)
+        self.rpc.do(o)
+        o = receipt(tx_hash)
+        r = self.rpc.do(o)
+        self.assertEqual(r['status'], 1)
+
+        c = Vend(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
+        (tx_hash, o) = c.get_for(self.vend_address, self.alice, vended_token_address)
         self.rpc.do(o)
         o = receipt(tx_hash)
         r = self.rpc.do(o)
@@ -79,8 +92,38 @@ class TestVendBase(TestVend):
         o = c.balance_of(self.token_address, self.alice, sender_address=self.accounts[0])
         r = self.rpc.do(o)
         balance = c.parse_balance(r)
+        self.assertEqual(balance, 0)
+
+        c = Vend(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
+        (tx_hash, o) = c.withdraw_for(self.vend_address, self.alice, vended_token_address)
+        self.rpc.do(o)
+        o = receipt(tx_hash)
+        r = self.rpc.do(o)
+        self.assertEqual(r['status'], 0)
+
+        c = ERC20(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
+        (tx_hash, o) = c.approve(vended_token_address, self.alice, self.vend_address, vend_amount)
+        self.rpc.do(o)
+
+        c = Vend(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
+        (tx_hash, o) = c.withdraw_for(self.vend_address, self.alice, vended_token_address)
+        self.rpc.do(o)
+        o = receipt(tx_hash)
+        r = self.rpc.do(o)
+        self.assertEqual(r['status'], 1)
+
+        c = ERC20(self.chain_spec)
+        o = c.balance_of(vended_token_address, self.alice, sender_address=self.accounts[0])
+        r = self.rpc.do(o)
+        balance = c.parse_balance(r)
+        self.assertEqual(balance, 0)
+
+        o = c.balance_of(self.token_address, self.alice, sender_address=self.accounts[0])
+        r = self.rpc.do(o)
+        balance = c.parse_balance(r)
         self.assertEqual(balance, src_amount)
 
 
+
 if __name__ == '__main__':
     unittest.main()
diff --git a/python/tests/test_events.py b/python/tests/test_events.py
@@ -11,7 +11,7 @@ from giftable_erc20_token import GiftableToken
 from hexathon import same as same_hex
 
 # local imports
-from erc20_vend.unittest import TestVend
+from erc20_vend.unittest.base import TestVendCore
 from erc20_vend import Vend
 
 
@@ -19,9 +19,10 @@ logging.basicConfig(level=logging.DEBUG)
 logg = logging.getLogger()
 
 
-class TestVendBase(TestVend):
+class TestVendBase(TestVendCore):
 
     def test_create_token_event(self):
+        self.publish(mint=True)
         nonce_oracle = RPCNonceOracle(self.accounts[0], conn=self.conn)
         c = Vend(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
         (tx_hash, o) = c.create(self.vend_address, self.accounts[0], 'foo vend', 'FOOVEND')
@@ -37,13 +38,16 @@ class TestVendBase(TestVend):
         dec = ABIContractLogDecoder()
         dec.topic('TokenCreated')
         dec.typ(ABIContractType.UINT256)
+        dec.typ(ABIContractType.UINT256)
         dec.typ(ABIContractType.ADDRESS)
         dec.apply(rlog['topics'], [rlog['data']])
         self.assertEqual(int(dec.contents[0], 16), 0)
-        self.assertEqual(int(dec.contents[1], 16), int(vended_token_address, 16))
+        self.assertEqual(int(dec.contents[1], 16), 0)
+        self.assertEqual(int(dec.contents[2], 16), int(vended_token_address, 16))
 
 
     def test_mint_event(self):
+        self.publish(mint=True)
         nonce_oracle = RPCNonceOracle(self.accounts[0], conn=self.conn)
         c = Vend(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
         (tx_hash, o) = c.create(self.vend_address, self.accounts[0], 'foo vend', 'FOOVEND')
@@ -61,10 +65,11 @@ class TestVendBase(TestVend):
 
         nonce_oracle = RPCNonceOracle(self.alice, conn=self.conn)
         c = Vend(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
-        (tx_hash, o) = c.mint_for(self.vend_address, self.alice, vended_token_address)
+        (tx_hash, o) = c.get_for(self.vend_address, self.alice, vended_token_address)
         self.rpc.do(o)
         o = receipt(tx_hash)
         r = self.rpc.do(o)
+        self.assertEqual(r['status'], 1)
         rlog = r['logs'][0]
 
         dec = ABIContractLogDecoder()
@@ -78,5 +83,72 @@ class TestVendBase(TestVend):
         self.assertEqual(int(dec.contents[2], 16), vend_amount)
 
 
+    def test_create_token_nomint_event(self):
+        self.publish()
+        nonce_oracle = RPCNonceOracle(self.accounts[0], conn=self.conn)
+        c = Vend(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
+        (tx_hash, o) = c.create(self.vend_address, self.accounts[0], 'foo vend', 'FOOVEND')
+        self.rpc.do(o)
+        o = receipt(tx_hash)
+        r = self.rpc.do(o)
+        self.assertEqual(r['status'], 1)
+        rlog = r['logs'][1]
+        
+        o = c.get_token(self.vend_address, 0, sender_address=self.accounts[0])
+        r = self.rpc.do(o)
+        vended_token_address = c.parse_token(r)
+
+        dec = ABIContractLogDecoder()
+        dec.topic('TokenCreated')
+        dec.typ(ABIContractType.UINT256)
+        dec.typ(ABIContractType.UINT256)
+        dec.typ(ABIContractType.ADDRESS)
+        dec.apply(rlog['topics'], [rlog['data']])
+        self.assertEqual(int(dec.contents[0], 16), 0)
+        self.assertEqual(int(dec.contents[1], 16), self.initial_supply)
+        self.assertEqual(int(dec.contents[2], 16), int(vended_token_address, 16))
+
+
+    def test_mint_event(self):
+        self.publish()
+        nonce_oracle = RPCNonceOracle(self.accounts[0], conn=self.conn)
+        c = Vend(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
+        (tx_hash, o) = c.create(self.vend_address, self.accounts[0], 'foo vend', 'FOOVEND')
+        self.rpc.do(o)
+
+        o = c.get_token(self.vend_address, 0, sender_address=self.accounts[0])
+        r = self.rpc.do(o)
+        vended_token_address = c.parse_token(r)
+
+        vend_amount = 100
+        src_amount = vend_amount * (10 ** self.token_decimals)
+        c = GiftableToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
+        (tx_hash, o) = c.mint_to(self.token_address, self.accounts[0], self.alice, src_amount)
+        self.rpc.do(o)
+
+        nonce_oracle = RPCNonceOracle(self.alice, conn=self.conn)
+        c = ERC20(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
+        (tx_hash, o) = c.approve(self.token_address, self.alice, self.vend_address, src_amount)
+        self.rpc.do(o)
+
+        c = Vend(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
+        (tx_hash, o) = c.get_for(self.vend_address, self.alice, vended_token_address)
+        self.rpc.do(o)
+        o = receipt(tx_hash)
+        r = self.rpc.do(o)
+        self.assertEqual(r['status'], 1)
+        rlog = r['logs'][1]
+
+        dec = ABIContractLogDecoder()
+        dec.topic('Transfer')
+        dec.typ(ABIContractType.ADDRESS)
+        dec.typ(ABIContractType.ADDRESS)
+        dec.typ(ABIContractType.UINT256)
+        dec.apply(rlog['topics'], [rlog['data']])
+        self.assertEqual(int(dec.contents[0], 16), int(self.vend_address, 16))
+        self.assertEqual(int(dec.contents[1], 16), int(self.alice, 16))
+        self.assertEqual(int(dec.contents[2], 16), vend_amount)
+
+
 if __name__ == '__main__':
     unittest.main()
diff --git a/python/tests/test_lock.py b/python/tests/test_lock.py
@@ -1,107 +0,0 @@
-# standard imports
-import unittest
-import logging
-import os
-from chainlib.eth.nonce import RPCNonceOracle
-from chainlib.eth.contract import ABIContractEncoder
-from chainlib.eth.contract import ABIContractType
-from chainlib.eth.tx import TxFormat
-from chainlib.eth.tx import receipt
-from eth_erc20 import ERC20
-from giftable_erc20_token import GiftableToken
-from hexathon import add_0x
-
-# local imports
-from erc20_vend.unittest import TestVendParams
-from erc20_vend import Vend
-
-
-logging.basicConfig(level=logging.DEBUG)
-logg = logging.getLogger()
-
-class TestVendLocked(TestVendParams):
-
-    def test_vend_token_lock(self):
-        nonce_oracle = RPCNonceOracle(self.accounts[0], conn=self.conn)
-        c = Vend(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
-        (tx_hash, o) = c.create(self.vend_address, self.accounts[0], 'foo vend', 'FOOVEND')
-        self.rpc.do(o)
-
-        o = c.get_token(self.vend_address, 0, sender_address=self.accounts[0])
-        r = self.rpc.do(o)
-        vended_token_address = c.parse_token(r)
-
-        vend_amount = 100
-        src_amount = vend_amount * (10 ** (self.token_decimals - 2))
-        c = GiftableToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
-        (tx_hash, o) = c.mint_to(self.token_address, self.accounts[0], self.alice, src_amount)
-        self.rpc.do(o)
-        o = receipt(tx_hash)
-        r = self.rpc.do(o)
-        self.assertEqual(r['status'], 1)
-
-        nonce_oracle = RPCNonceOracle(self.alice, conn=self.conn)
-        c = Vend(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
-        (tx_hash, o) = c.mint_for(self.vend_address, self.alice, vended_token_address)
-        self.rpc.do(o)
-        o = receipt(tx_hash)
-        r = self.rpc.do(o)
-        self.assertEqual(r['status'], 0)
-
-        c = ERC20(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
-        (tx_hash, o) = c.approve(self.token_address, self.alice, self.vend_address, src_amount)
-        self.rpc.do(o)
-        o = receipt(tx_hash)
-        r = self.rpc.do(o)
-        self.assertEqual(r['status'], 1)
-
-        c = Vend(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
-        (tx_hash, o) = c.mint_for(self.vend_address, self.alice, vended_token_address)
-        self.rpc.do(o)
-        o = receipt(tx_hash)
-        r = self.rpc.do(o)
-        self.assertEqual(r['status'], 1)
-
-        c = ERC20(self.chain_spec)
-        o = c.balance_of(vended_token_address, self.alice, sender_address=self.accounts[0])
-        r = self.rpc.do(o)
-        balance = c.parse_balance(r)
-        self.assertEqual(balance, vend_amount)
-
-        o = c.balance_of(self.token_address, self.alice, sender_address=self.accounts[0])
-        r = self.rpc.do(o)
-        balance = c.parse_balance(r)
-        self.assertEqual(balance, 0)
-
-        c = Vend(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
-        (tx_hash, o) = c.withdraw_for(self.vend_address, self.alice, vended_token_address)
-        self.rpc.do(o)
-        o = receipt(tx_hash)
-        r = self.rpc.do(o)
-        self.assertEqual(r['status'], 0)
-
-        c = ERC20(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
-        (tx_hash, o) = c.approve(vended_token_address, self.alice, self.vend_address, vend_amount)
-        self.rpc.do(o)
-
-        c = Vend(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
-        (tx_hash, o) = c.withdraw_for(self.vend_address, self.alice, vended_token_address)
-        self.rpc.do(o)
-        o = receipt(tx_hash)
-        r = self.rpc.do(o)
-        self.assertEqual(r['status'], 1)
-
-        c = ERC20(self.chain_spec)
-        o = c.balance_of(vended_token_address, self.alice, sender_address=self.accounts[0])
-        r = self.rpc.do(o)
-        balance = c.parse_balance(r)
-        self.assertEqual(balance, 0)
-
-        o = c.balance_of(self.token_address, self.alice, sender_address=self.accounts[0])
-        r = self.rpc.do(o)
-        balance = c.parse_balance(r)
-        self.assertEqual(balance, src_amount)
-
-
-if __name__ == '__main__':
-    unittest.main()
diff --git a/python/tests/test_supply.py b/python/tests/test_supply.py
@@ -0,0 +1,81 @@
+# standard imports
+import unittest
+import logging
+import os
+from chainlib.eth.nonce import RPCNonceOracle
+from chainlib.eth.contract import ABIContractLogDecoder
+from chainlib.eth.contract import ABIContractType
+from chainlib.eth.tx import receipt
+from eth_erc20 import ERC20
+from giftable_erc20_token import GiftableToken
+from hexathon import same as same_hex
+
+# local imports
+from erc20_vend.unittest.base import TestVendCore
+from erc20_vend import Vend
+
+
+logging.basicConfig(level=logging.DEBUG)
+logg = logging.getLogger()
+
+
+class TestVendBase(TestVendCore):
+
+    def test_create_token_event(self):
+        self.publish()
+
+        nonce_oracle = RPCNonceOracle(self.accounts[0], conn=self.conn)
+        c = Vend(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
+        (tx_hash, o) = c.create(self.vend_address, self.accounts[0], 'foo vend', 'FOOVEND')
+        self.rpc.do(o)
+        
+        o = c.get_token(self.vend_address, 0, sender_address=self.accounts[0])
+        r = self.rpc.do(o)
+        vended_token_address = c.parse_token(r)
+
+        c = ERC20(self.chain_spec)
+        o = c.total_supply(vended_token_address, sender_address=self.accounts[0])
+        r = self.rpc.do(o)
+        self.assertEqual(int(r, 16), self.initial_supply)
+
+
+    def test_create_token_nomint_event(self):
+        self.publish(mint=True)
+
+        nonce_oracle = RPCNonceOracle(self.accounts[0], conn=self.conn)
+        c = Vend(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
+        (tx_hash, o) = c.create(self.vend_address, self.accounts[0], 'foo vend', 'FOOVEND')
+        self.rpc.do(o)
+        
+        o = c.get_token(self.vend_address, 0, sender_address=self.accounts[0])
+        r = self.rpc.do(o)
+        vended_token_address = c.parse_token(r)
+
+        c = ERC20(self.chain_spec)
+        o = c.total_supply(vended_token_address, sender_address=self.accounts[0])
+        r = self.rpc.do(o)
+        self.assertEqual(int(r, 16), 0)
+
+        vend_amount = 100
+        src_amount = vend_amount * (10 ** self.token_decimals)
+        c = GiftableToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
+        (tx_hash, o) = c.mint_to(self.token_address, self.accounts[0], self.alice, src_amount)
+        self.rpc.do(o)
+
+        nonce_oracle = RPCNonceOracle(self.alice, conn=self.conn)
+        c = ERC20(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
+        (tx_hash, o) = c.approve(self.token_address, self.alice, self.vend_address, src_amount)
+        self.rpc.do(o)
+
+        c = Vend(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
+        (tx_hash, o) = c.get_for(self.vend_address, self.alice, vended_token_address)
+        self.rpc.do(o)
+
+        c = ERC20(self.chain_spec)
+        o = c.total_supply(vended_token_address, sender_address=self.accounts[0])
+        r = self.rpc.do(o)
+        self.assertEqual(int(r, 16), vend_amount)
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/solidity/Vend.sol b/solidity/Vend.sol
@@ -8,40 +8,71 @@ pragma solidity ^0.8.0;
 import "GiftableToken.sol";
 
 contract ERC20Vend {
+	address owner;
 	uint256 constant UINT256_MAX = 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff;
 	address controlToken;
 	uint8 controlDecimals;
 	uint8 decimals;
+	uint256 supply;
 	uint256 decimalDivisor;
-	bool lock;
+	mapping ( address => uint256 ) returned;
 	GiftableToken[] vendToken;
 	mapping ( address => mapping ( address => uint256 ) ) used;
 
-	event TokenCreated(uint256 indexed _idx, address _token);
+	mapping(address => bool) writers;
 
-	constructor(address _controlToken, uint8 _decimals, bool _lock) {
+	event TokenCreated(uint256 indexed _idx, uint256 indexed _supply, address _token);
+
+	constructor(address _controlToken, uint8 _decimals, bool _mint) {
 		bool r;
 		bytes memory v;
 
 		controlToken = _controlToken;
 		decimals = _decimals;
-		lock = _lock;
 
 		(r, v) = controlToken.call(abi.encodeWithSignature("decimals()"));
 		require(r, "ERR_TOKEN");
 		controlDecimals = abi.decode(v, (uint8));
 		require(controlDecimals >= decimals);
 
+		if (!_mint) {
+			(r, v) = controlToken.call(abi.encodeWithSignature("totalSupply()"));
+			require(r, "ERR_TOKEN");
+			supply = abi.decode(v, (uint256));
+		}
+
 		decimalDivisor = (10 ** (controlDecimals - _decimals));
 		if (decimalDivisor == 0) {
 			decimalDivisor = 1;
 		}
+		owner = msg.sender;
+	}
+
+	// Implements Writer
+	function addWriter(address _minter) public returns (bool) {
+		require(msg.sender == owner);
+		writers[_minter] = true;
+		return true;
 	}
 
+	// Implements Writer
+	function deleteWriter(address _minter) public returns (bool) {
+		require(msg.sender == owner || msg.sender == _minter);
+		writers[_minter] = false;
+		return true;
+	}
+
+	// Implements Writer
+	function isWriter(address _minter) public view returns(bool) {
+		return writers[_minter] || _minter == owner;
+	}
+
+	// Retrieve address of vended token by sequential index.
 	function getTokenByIndex(uint256 _idx) public view returns(address) {
 		return address(vendToken[_idx]);
 	}
 
+	// Create a new vended token.
 	function create(string calldata _name, string calldata _symbol) public returns (address) {
 		GiftableToken l_contract;
 		address l_address;
@@ -51,11 +82,16 @@ contract ERC20Vend {
 		l_address = address(l_contract);
 		l_idx = vendToken.length;
 		vendToken.push(l_contract);
-		emit TokenCreated(l_idx, l_address);
+
+		if (supply > 0) {
+			l_contract.mintTo(address(this), supply);
+		}
+		emit TokenCreated(l_idx, supply, l_address);
 		return l_address;
 	}
 
-	function mintFor(address _token) public returns (uint256) {
+	// Receive the vended token for the currently held balance.
+	function getFor(address _token) public returns (uint256) {
 		GiftableToken l_token;
 		bool r;
 		bytes memory v;
@@ -75,27 +111,34 @@ contract ERC20Vend {
 			return 0;
 		}
 
-		if (lock) {
-			(r, v) = controlToken.call(abi.encodeWithSignature("transferFrom(address,address,uint256)", msg.sender, this, l_controlBalance));
-			require(r, "ERR_TOKEN");
-			r = abi.decode(v, (bool));
-			require(r, "ERR_TOKEN_TRANSFER");
-			used[msg.sender][address(l_token)] = l_controlBalance;
-		} else {
-			used[msg.sender][address(l_token)] = UINT256_MAX;
-		}
+		(r, v) = controlToken.call(abi.encodeWithSignature("transferFrom(address,address,uint256)", msg.sender, this, l_controlBalance));
+		require(r, "ERR_TOKEN");
+		r = abi.decode(v, (bool));
+		require(r, "ERR_TOKEN_TRANSFER");
+		used[msg.sender][address(l_token)] = l_controlBalance;
 
 		if (decimalDivisor == 0) {
 			l_ratioedValue = l_controlBalance;
 		} else {
 			l_ratioedValue = l_controlBalance / decimalDivisor;
 		}
-		if (!l_token.mintTo(msg.sender, l_ratioedValue)) {
-			revert("ERR_MINT");
+
+		if (supply == 0) {
+			if (!l_token.mintTo(msg.sender, l_ratioedValue)) {
+				revert("ERR_MINT");
+			}
+		} else {
+			(r, v) = _token.call(abi.encodeWithSignature("transfer(address,uint256)", msg.sender, l_ratioedValue));
+			require(r, "ERR_TOKEN");
+			r = abi.decode(v, (bool));
+			require(r, "ERR_VEND_TOKEN_TRANSFER");
 		}
 		return l_ratioedValue;
 	}
 
+	// If contract locks exchanged tokens, this can be called to retrieve the locked tokens.
+	// The vended token balance MUST match the original balance emitted on the exchange.
+	// The caller must have given allowance for the full amount.
 	function withdrawFor(address _token) public returns (uint256) {
 		bool r;
 		bytes memory v;
@@ -110,13 +153,16 @@ contract ERC20Vend {
 		l_vendBalance = checkLock(_token, msg.sender);
 		used[msg.sender][_token] = UINT256_MAX;
 
-		if (l_vendBalance < UINT256_MAX) {	
-			(r, v) = _token.call(abi.encodeWithSignature("transferFrom(address,address,uint256)", msg.sender, this, l_vendBalance));
-			require(r, "ERR_TOKEN");
-			r = abi.decode(v, (bool));
-			require(r, "ERR_TOKEN_TRANSFER");
+		if (l_vendBalance == UINT256_MAX) {
+			return 0;
 		}
 
+		(r, v) = _token.call(abi.encodeWithSignature("transferFrom(address,address,uint256)", msg.sender, this, l_vendBalance));
+		require(r, "ERR_TOKEN");
+		r = abi.decode(v, (bool));
+		require(r, "ERR_TOKEN_TRANSFER");
+		returned[_token] += l_vendBalance;
+
 		(r, v) = controlToken.call(abi.encodeWithSignature("transfer(address,uint256)", msg.sender, l_balance));
 		require(r, "ERR_TOKEN");
 		r = abi.decode(v, (bool));
@@ -125,22 +171,46 @@ contract ERC20Vend {
 		return l_balance;
 	}
 
+	// burn used vend tokens.
+	// should self-destruct contract if possible when supply reaches 0.
+	function burnFor(address _token) public returns(uint256) {
+		bool r;
+		bytes memory v;
+		uint256 l_burnValue;
+
+		l_burnValue = returned[_token];
+		(r, v) = _token.call(abi.encodeWithSignature("burn(uint256)", l_burnValue));
+		require(r, "ERR_TOKEN");
+		r = abi.decode(v, (bool));
+		require(r, "ERR_TOKEN_BURN");
+		returned[_token] = 0;
+		return l_burnValue;
+	}
+	
 	// returns UINT256_MAX if lock is inactive
-	// reverts if locked and target does not have the original balance
+	// reverts if target does not have the original balance
 	function checkLock(address _token, address _target) private returns (uint256) {
 		bool r;
 		bytes memory v;
 		uint256 l_currentBalance;
 		uint256 l_heldBalance;
 
-		if (lock) {
-			(r, v) = _token.call(abi.encodeWithSignature("balanceOf(address)", _target));
-			require(r, "ERR_TOKEN");
-			l_currentBalance = abi.decode(v, (uint256));
-			l_heldBalance = used[_target][_token];
-			require(l_currentBalance * decimalDivisor == l_heldBalance, "ERR_LOCKED");
-			return l_currentBalance;
+		(r, v) = _token.call(abi.encodeWithSignature("balanceOf(address)", _target));
+		require(r, "ERR_TOKEN");
+		l_currentBalance = abi.decode(v, (uint256));
+		l_heldBalance = used[_target][_token];
+		require(l_currentBalance * decimalDivisor == l_heldBalance, "ERR_LOCKED");
+		return l_currentBalance;
+	}
+
+	// Implements EIP165
+	function supportsInterface(bytes4 _sum) public pure returns (bool) {
+		if (_sum == 0x01ffc9a7) { // EIP165
+			return true;
+		}
+		if (_sum == 0xabe1f1f5) { // Writer
+			return true;
 		}
-		return UINT256_MAX;
+		return false;
 	}
 }

	erc20-vend Create ERC20 tokens the can be minted by existing ERC20 token balance
	Log \| Files \| Refs

M	python/erc20_vend/data/Vend.bin	\|	4	++--
M	python/erc20_vend/data/Vend.json	\|	2	+-
M	python/erc20_vend/data/Vend.metadata.json	\|	2	+-
M	python/erc20_vend/unittest/base.py	\|	4	++--
M	python/erc20_vend/vend.py	\|	12	++++++------
M	python/tests/test_base.py	\|	49	++++++++++++++++++++++++++++++++++++++++++++++---
M	python/tests/test_events.py	\|	80	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
D	python/tests/test_lock.py	\|	107	-------------------------------------------------------------------------------
A	python/tests/test_supply.py	\|	81	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M	solidity/Vend.sol	\|	132	++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------------------