Add quoter example contract for decimals translation

python/erc20_pool/data/DecimalQuote.bin

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python/erc20_pool/data/DecimalQuote.json

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+[{"inputs":[{"internalType":"address","name":"_outToken","type":"address"},{"internalType":"address","name":"_inToken","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"valueFor","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"}]

python/erc20_pool/data/DecimalQuote.metadata.json

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+{"compiler":{"version":"0.8.19+commit.7dd6d404"},"language":"Solidity","output":{"abi":[{"inputs":[{"internalType":"address","name":"_outToken","type":"address"},{"internalType":"address","name":"_inToken","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"valueFor","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"}],"devdoc":{"kind":"dev","methods":{},"version":1},"userdoc":{"kind":"user","methods":{},"version":1}},"settings":{"compilationTarget":{"DecimalQuote.sol":"DecimalQuote"},"evmVersion":"byzantium","libraries":{},"metadata":{"bytecodeHash":"ipfs"},"optimizer":{"enabled":false,"runs":200},"remappings":[]},"sources":{"DecimalQuote.sol":{"keccak256":"0x9e5bc44ea381d6794c6bc992b8cee0b68fb700ab0ad888e5cec390d2261fd5f2","license":"AGPL-3.0-or-later","urls":["bzz-raw://a1d11d7ee1286203963eef4846272465fc7abdeb5c4e054f84fe9dada91b10ee","dweb:/ipfs/QmZQDttgfUBAJxxRpxW8JkwkWi61hNQ79NNrWD64Ak92vw"]}},"version":1}

python/erc20_pool/quote.py

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+# standard imports
+import logging
+import os
+import enum
+
+# external imports
+from chainlib.eth.constant import ZERO_ADDRESS
+from chainlib.eth.constant import ZERO_CONTENT
+from chainlib.eth.contract import (
+    ABIContractEncoder,
+    ABIContractDecoder,
+    ABIContractType,
+    abi_decode_single,
+)
+from chainlib.eth.jsonrpc import to_blockheight_param
+from chainlib.eth.error import RequestMismatchException
+from chainlib.eth.tx import (
+    TxFactory,
+    TxFormat,
+)
+from chainlib.jsonrpc import JSONRPCRequest
+from chainlib.block import BlockSpec
+from hexathon import (
+    add_0x,
+    strip_0x,
+)
+from chainlib.eth.cli.encode import CLIEncoder
+
+# local imports
+from erc20_pool.data import data_dir
+
+logg = logging.getLogger()
+
+
+class DecimalQuote(TxFactory):
+
+    __abi = None
+    __bytecode = None
+
+    def constructor(self, sender_address, tx_format=TxFormat.JSONRPC, version=None):
+        code = self.cargs(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(version=None):
+        code = DecimalQuote.bytecode(version=version)
+        enc = ABIContractEncoder()
+        args = enc.get()
+        code += args
+        logg.debug('constructor code: ' + args)
+        return code
+
+
+    @staticmethod
+    def gas(code=None):
+        return 4000000
+
+
+    @staticmethod
+    def abi():
+        if DecimalQuote.__abi == None:
+            f = open(os.path.join(data_dir, 'DecimalQuote.json'), 'r')
+            DecimalQuote.__abi = json.load(f)
+            f.close()
+        return DecimalQuote.__abi
+
+
+    @staticmethod
+    def bytecode(version=None):
+        if DecimalQuote.__bytecode == None:
+            f = open(os.path.join(data_dir, 'DecimalQuote.bin'))
+            DecimalQuote.__bytecode = f.read()
+            f.close()
+        return DecimalQuote.__bytecode
+
+
+    def value_for(self, contract_address, token_address_out, token_address_in, value_in, sender_address=ZERO_ADDRESS, id_generator=None):
+        j = JSONRPCRequest(id_generator)
+        o = j.template()
+        o['method'] = 'eth_call'
+        enc = ABIContractEncoder()
+        enc.method('valueFor')
+        enc.typ(ABIContractType.ADDRESS)
+        enc.typ(ABIContractType.ADDRESS)
+        enc.typ(ABIContractType.UINT256)
+        enc.address(token_address_out)
+        enc.address(token_address_in)
+        enc.uint256(value_in)
+        data = add_0x(enc.get())
+        tx = self.template(sender_address, contract_address)
+        tx = self.set_code(tx, data)
+        o['params'].append(self.normalize(tx))
+        o['params'].append('latest')
+        o = j.finalize(o)
+        return o

python/erc20_pool/unittest/quote.py

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+# standard imports
+import logging
+import time
+# external imports
+from chainlib.eth.unittest.ethtester import EthTesterCase
+from chainlib.connection import RPCConnection
+from chainlib.eth.nonce import RPCNonceOracle
+from chainlib.eth.tx import receipt
+from chainlib.eth.address import to_checksum_address
+from giftable_erc20_token.unittest import TestGiftableToken
+from eth_erc20 import ERC20
+from chainlib.eth.block import block_latest
+from eth_accounts_index.unittest import TestAccountsIndex
+from eth_accounts_index.registry import AccountRegistry
+from giftable_erc20_token import GiftableToken
+from erc20_limiter.unittest import TestLimiter
+
+# local imports
+from erc20_pool.quote import DecimalQuote
+
+logg = logging.getLogger(__name__)
+
+class TestDecimalQuote(EthTesterCase):
+
+    def setUp(self):
+        super(TestDecimalQuote, self).setUp()
+        self.conn = RPCConnection.connect(self.chain_spec, 'default')
+
+        nonce_oracle = RPCNonceOracle(self.accounts[0], conn=self.conn)
+        c = DecimalQuote(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
+        (tx_hash, o) = c.constructor(self.accounts[0])
+        self.rpc.do(o)
+        o = receipt(tx_hash)
+        r = self.rpc.do(o)
+        self.assertEqual(r['status'], 1)
+        self.quoter_address = to_checksum_address(r['contract_address'])
+        logg.debug('published quoter {}'.format(self.quoter_address))

python/tests/test_quoter.py

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+# standard imports
+import unittest
+import logging
+import os
+from chainlib.eth.nonce import RPCNonceOracle
+from chainlib.eth.tx import receipt
+from chainlib.eth.block import block_latest
+from hexathon import same as same_hex
+from eth_erc20 import ERC20
+from giftable_erc20_token import GiftableToken
+from erc20_limiter import Limiter
+
+# local imports
+from erc20_pool.quote import DecimalQuote
+from erc20_pool.unittest.quote import TestDecimalQuote
+
+logging.basicConfig(level=logging.DEBUG)
+logg = logging.getLogger()
+
+class TestQuote(TestDecimalQuote):
+
+    def setUp(self):
+        super(TestQuote, self).setUp()
+        self.tokens = {}
+        self.publish_token('Foo token', 'FOO', 14)
+        self.publish_token('Bar token', 'BAR', 18)
+        self.publish_token('Baz token', 'BAZ', 11)
+
+    def publish_token(self, name, symbol, decimals):
+        nonce_oracle = RPCNonceOracle(self.accounts[0], conn=self.conn)
+        c = GiftableToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
+        self.symbol = name
+        self.name = symbol
+        self.decimals = decimals
+        (tx_hash, o) = c.constructor(self.accounts[0], self.name, self.symbol, self.decimals, expire=0)
+        self.rpc.do(o)
+        o = receipt(tx_hash)
+        r = self.rpc.do(o)
+        self.assertEqual(r['status'], 1)
+        address = r['contract_address'] 
+        logg.debug('published "{}" ("{}") on address {} with hash {}'.format(name, symbol, address, tx_hash))
+        self.tokens[symbol] = address
+
+
+    def test_quote(self):
+        c = DecimalQuote(self.chain_spec)
+        o = c.value_for(self.quoter_address, self.tokens['FOO'], self.tokens['FOO'], 10**18, sender_address=self.accounts[0])
+        r = self.rpc.do(o)
+        self.assertEqual(int(r, 16), 10**18)
+
+        o = c.value_for(self.quoter_address, self.tokens['FOO'], self.tokens['BAR'], 10**18, sender_address=self.accounts[0])
+        r = self.rpc.do(o)
+        self.assertEqual(int(r, 16), 10**14)
+
+        o = c.value_for(self.quoter_address, self.tokens['FOO'], self.tokens['BAZ'], 10**18, sender_address=self.accounts[0])
+        r = self.rpc.do(o)
+        self.assertEqual(int(r, 16), 10**21)
+
+
+if __name__ == '__main__':
+    unittest.main()