20170516 T.E.M

1. Facebook

2. • communicates to a local node through RPC calls.
• works with any Ethereum node, which exposes an RPC layer
• rpcapi
eth,web3,personal …

4. getTransaction

5. Node A Node BAWS EC2 micro tier
geth 1.5.9 , node.js 7.8.0
write_data.js read_data.js

6. data:web3.toHex(dataStr)
web3.eth.sendTransaction(transactionObject , callback);

7. filter.watch(callback);
function callback(err,result) {
var tx = web3.eth.getTransaction(result);
var txData = web3.toAscii(tx.input);
}

8. Time to Play
Round 1

10. Node A Node BAWS EC2 micro tier
geth 1.5.9 , node.js 7.8.0
deploy_contract.js
call_contract.js
watch_transaction_2.js

12. compiledContract = solc.compile(source);
var bytecode = compiledContract.contracts[contractName].bytecode;
var abi = JSON.parse(compiledContract.contracts[contractName].interface);
var MyContract = web3.eth.contract(abi);
MyContract.new(config ,callback);

13. myContract.setValue(argv ,config,callback);

14. filter.watch(callback);
function callback(err,result) {
myContract.value();
}

15. Time to Play
Round 2

17. Node A Node BAWS EC2 micro tier
geth 1.5.9 , node.js 7.8.0
deploy_contract.js
call_contract_2.js
watch_transaction_2.js

18. event

19. compiledContract = solc.compile(source);
var bytecode = compiledContract.contracts[contractName].bytecode;
var abi = JSON.parse(compiledContract.contracts[contractName].interface);
var MyContract = web3.eth.contract(abi);
MyContract.new(config ,callback);

20. myContract.setValue2(argv1,argv2 ,config,callback);

21. filter.watch(callback);
function callback(err,result) {
var txReceipt = web3.eth.getTransactionReceipt(transactionHash);
txReceipt.logs[0].data
}

22. Time to Play
Round 3

23. Thank You
Facebook