I'm having trouble trying to create a simple contract that "just log" to the blockchain what is being sent from a java client. The transaction executing the log looks to be correct (how can I be sure about it?) but I find no way to retrieve the logs from the java client:
The smart-contract looks similar to:
pragma solidity ^0.4.2;
contract MyLogContract {
event genericLog(
uint256 indexed _index1, uint256 indexed _index2, uint256 indexed _index3, string _log);
function writeGenericLog01(
uint256 _index1, uint256 _index2, uint256 _index3,
string _log)
returns (bool success) {
genericLog(_index1, _index2, _index3, _log);
return true;
}
}
The java code looks similar to (userWrapper4Logs => use java wrapper, otherwise use hand-made transaction):
TransactionReceipt receipt;
if (!userWrapper4Logs){
String encodedFunction = FunctionEncoder.encode(
new Function("writeGenericLog01",
Arrays.asList(Uint256.DEFAULT,
Uint256.DEFAULT, Uint256.DEFAULT,
new Utf8String("Best log in Town!")) ,
Arrays.asList(new TypeReference<Uint256>() {} )
)
);
String from = ownerAddress;
BigInteger gasPrice = BigInteger.valueOf(1),
gasLimit = BigInteger.valueOf(1000000L);
nonce = null; // <- Ummm?
String to = bc.listenerAPI_contractAddress;
Transaction transaction = Transaction.
createFunctionCallTransaction(
from, nonce, gasPrice, gasLimit, to, encodedFunction);
Optional<TransactionReceipt> transactionResponse =
auxExecuteTransaction(transaction);
receipt = transactionResponse.get();
}
if (userWrapper4Logs) {
MyLogContract wrapper = getContract(contractAddress, owner);
receipt = wrapper.writeGenericLog01(
Uint256.DEFAULT,
Uint256.DEFAULT,
Uint256.DEFAULT,
new Utf8String("Best log in the wild wild West!")
).get();
}
System.out.println( ""
+ "\n BlockNumber() : " + receipt.getBlockNumber()
+ "\n Cumulativ eGasUsed() : " + receipt.getCumulativeGasUsed()
+ "\n Log size : " + receipt.getLogs().size() );
The transaction looks to execute properly and after mining 5 blocks the receipt is returned. Nothingness the log size is always zero. The STDOUT output looks similar to:
BlockNumber() : 2528
Cumulativ eGasUsed() : 22872
Log size : 0
I have some doubts about whether testrpc is able to handle log transactions or maybe they are just discarded by this sort of javascript node simulator, so I also tested with a real geth using next parameters (maybe something else is also needed):
$ geth --verbosity 4 --dev --maxpeers 0 --nodiscover --rpc --rpcaddr 0.0.0.0 --networkid 1500 --mine --fakepow --minerthreads=1 --etherbase=0x......
(I also tried without the --dev option but then transaction looks to be never confirmed).
Thanks in advance for any help/hint or link!
Update 201-05-09: I tested the same contract with Truffle/web3js and logs are detected properly by the client, even using testrpc (only restricted to setup the event listener before submitting the transaction).
