AWS ?? ???? (2?) - ???? ??? ???? (??? & ???, AWS ???? ????) :: AWS DevDay2018
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AWS ?? ???? (2?) - ???? ??? ???? AWS?? Blockchain Service? ???? ?? ??? ?????. Cloud9?? dApp??? ?? ??? ???? Solidity ????? ?? ??? ?, AWS Network? ???? ??? ?????.
![? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved.
??? ???? ??
pragma solidity ^0.4.24;
contract LeaseProperty {
address[16] public lessees;
// Lease a property
function lease(uint propertyId) public returns (uint) {
require(propertyId >= 0 && propertyId <= 15);
lessees[propertyId] = msg.sender;
return propertyId;
}
// Retrieving the lessees
function getLessees() public view returns (address[16]) {
return lessees;
}
}
16? address ??
propertyId? ???
address? ??? SET
lessees ?? GET
contracts / LeaseProperty.sol
??
????
Step1 Step2 Step3 Step4 Step5 Step6
Smart
Contract
??
Ganache
???
??
??
?????
??
??
???
??
AWS
??
??](https://image.slidesharecdn.com/devday2018cloudnative2session3-181114044601/85/AWS-2-AWS-AWS-DevDay2018-14-320.jpg)
![? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved.
Set Get
????? ???? ???? ? ????? ???? ???? ?
????? ???.
(???? ??, SendTransaction ?)
????? ?? X
Value(ETH), Gas ?? Value(ETH), Gas ???? ??.
Hex string ??? ????. Hex string ?? ????.
Transaction? Mining????
callback ??? ???? ???.
get ??? ????
callback ??? ???? ??? ? ??.
??? Transaction? Mining????
???? ?? ?? ????.
callback ??? ???? ?? ????.
????? ? ??? ?? ???? ???? swarm? ?? p2p ????? ???? ?? ??.
[??] Set vs Get ??
????
Step1 Step2 Step3 Step4 Step5 Step6
Smart
Contract
??
Ganache
???
??
??
?????
??
??
???
??
AWS
??
??](https://image.slidesharecdn.com/devday2018cloudnative2session3-181114044601/85/AWS-2-AWS-AWS-DevDay2018-15-320.jpg)
![? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved.
truffle.js (truffle ????)
const HDWalletProvider = require("truffle-hdwallet-provider-privkey");
const privateKeys = ["afd2168f63635b5235cc8b4d69730faa4ffbea5cfcfab7b7d7625f91656e7d9f"];
module.exports = {
¡
networks: {
awsNetwork: {
provider: () => { return new HDWalletProvider(privateKeys, "http://<RPC-Endpoint>:8545") },
network_id: 1500,
gas: 300000
}
Provider: ??? RPC URL
privateKeys: ?? ?? Account? ???? ?
$ truffle migrate ¨Cnetwork awsNetwork
AWS ?? ?? ?? ??
????
Step1 Step2 Step3 Step4 Step5 Step6
Smart
Contract
??
Ganache
???
??
??
?????
??
??
???
??
AWS
??
??](https://image.slidesharecdn.com/devday2018cloudnative2session3-181114044601/85/AWS-2-AWS-AWS-DevDay2018-23-320.jpg)
![? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved.
[??] Blockchain Account
? ??? Account? ??. EOA, CA
Externally Owned
Account (EOA)
User
Create or Import ??????? ??
Address
Private Key
Balance
Contract
Account (CA)
Address
Code
Balance
??? ??
???? ??](https://image.slidesharecdn.com/devday2018cloudnative2session3-181114044601/85/AWS-2-AWS-AWS-DevDay2018-35-320.jpg)
![? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved.
sendTransaction(C,10)
( ???? )
Quiz msg.sender? ?????
CrowdFund Token Contract
msg.sender = ?
transfer(A,10)
( ??? )
function () payable external {
require(!crowdsaleClosed);
uint amount = msg.value;
balanceOf[msg.sender] += amount;
amountRaised += amount;
tokenReward.transfer(msg.sender, amount / price);
FundTransfer(msg.sender, amount, true);
}
function transfer(address _to, uint256 _value) public {
require(_value <= balanceOf[msg.sender]);
require(balanceOf[_to] + _value >= balanceOf[_to] );
balanceOf[msg.sender] -= _value;
balanceOf[_to] += _value;
Transfer(msg.sender,_to,_value);
}
msg.sender = ?](https://image.slidesharecdn.com/devday2018cloudnative2session3-181114044601/85/AWS-2-AWS-AWS-DevDay2018-50-320.jpg)
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AWS ?? ???? (2?) - ???? ??? ???? (??? & ???, AWS ???? ????) :: AWS DevDay2018
- 1. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. AWS ?? ???? (2?) ???? dAPP ???? ??? & ??? ???? ???? AWS
- 2. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. ??? dAPP ?????? ????
- 3. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. ??&????&?? ??? ???&?? ??? ??? ??? ??? Smart Contract ?? IFTTT logic (IF-THIS-THEN-THAT logic). ??? ???? pragma solidity ^0.4.0; // version pragma contract SimpleHouse { uint storedHouse; function set(uint x) { storedHouse = x; } function get() constant returns (uint){ return storedHouse; } } ??? ??? O2O???
- 4. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Ethereum Node Transaction 01 Transaction 02 ¡ Block 1 Block 2 Block 700 Transaction 51 Transaction 52 ¡ Transaction 5050 Transaction 5051 ¡ EVM (Ethereum Virtual Machine) ??? 6060604052341561000f57600080fd5b60cb8 061001d6000396000f300606060405260003 57c010000000000000000000000000000000 0000000000000000000000000900463ffffffff1 6806360fe47b11460465780636d4ce63c146 06657600080fd5b3415605057600080fd5b60 646004808035906020019091905050608c56 5b005b3415607057600080fd5b6076609656 5b6040518082815260200191505060405180 910390f35b8060008190555050565b600080 549050905600a165627a7a7230582028bc74 92f6656c8724a031e0be80cda671951e9ad1 7517b1b76b9d7bcaccc0b50029 Smart Contract Bytecode pragma solidity ^0.4.0; contract SimpleStorage { uint storedData; function set(uint x) {storedData = x;} function get() constant returns (uint) { return storedData; } } Smart Contract Source ¢Ù Compile ¢Ú Deploy S PUSH1 0x60 PUSH1 0x40 MSTORE CALLVALUE ISZERO PUSH2 0xF JUMPI PUSH1 0x0 DUP1 REVERT JUMPDEST PUSH1 0xCB DUP1 PUSH2 0x1D PUSH1 0x0 CODECOPY PUSH1 0x0 RETURN STOP PUSH1 0x60 PUSH1 0x40 MSTORE PUSH1 0x0 CALLDATALOAD PUSH29 0x100000000000000000000000 00000000000000000000000000 0000000 SWAP1 DIV PUSH4 0xFFFFFFFF AND DUP1 PUSH4 0x60FE47B1 EQ PUSH1 0x46 JUMPI DUP1 PUSH4 0x6D4CE63C...... Smart Contract Opcode Dapp (decentralized Application) Web3.js WebApp (html/javascript/css) Json RPC ????? ¢Û ???? ?? (????? + ABI?? + ??? ) Smart Contract ?? ??
- 5. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Programming Language Solidity Viper Serpent LLL(Lisp Like Language) Source Code Referenceable Projects CryptoKitties Zilliqa Bread ALIS Developing Environment go-ethereum (geth) ganache cpp-ethereum pyethapp ethereumjs-lib parity EthereumJ ruby-ethereum ethereumH Developing Support Tools Truffle Open-Zeppelin Etherscan Web3(JS, Python, Haskell, Java, Scala) Mist MetaMask INFURA * * * * * * Smart Contracts ?? ??
- 6. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. House Rental dAPP? ??????
- 7. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. House Rental ???? ??? ?????
- 8. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. House Rental ? ??? ????? ¢Ú ??? ???? ???? ?? ? ?? ¢Û ???? ?? ????? ?? (Web.js) ¢Ù ¡®Lease¡¯ ?? ?? ¡¾ dAPP ?? ????? ¡¿ ¡¾ ?? ???? ?? ¡¿ ??? ??? ¡¾ Web ????? ¡¿ ¡¾ Ethereum ???? ¡¿ ???? ???? ???? ???? ??? Ganache
- 9. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. House Rentals ?? ?? ?? ???? Step1 Step2 Step3 Step4 Step5 Step6 Smart Contract ?? Ganache ??? ?? ?? ????? ?? ?? ??? ?? AWS ?? ?? ¢Ù Smart Contract ?? ¢Ú Smart Contract Compile ¢Û Smart Contract Test ¢Ü Smart Contract Migrate
- 10. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. ?? ?? ?? ¢Ù NPM https://nodejs.org ¢Ú Truffle Framework https://github.com/trufflesuite/truffle ¡ù npm install -g truffle ? ?? ¢Û Ganache http://truffleframework.com/ganache ¢Ü IDE: (eg. AWS Cloud 9, Intelij, Visual Studio, WebStorm etc.) (Optional) Syntax Highlighting for your IDE: Solidity ¢Ý Metamask https://metamask.io ?? ???? Step1 Step2 Step3 Step4 Step5 Step6 Smart Contract ?? Ganache ??? ?? ?? ????? ?? ?? ??? ?? AWS ?? ??
- 11. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. ?? ?? ?? - IDE Visual Studio Intellij ?? ???? Step1 Step2 Step3 Step4 Step5 Step6 Smart Contract ?? Ganache ??? ?? ?? ????? ?? ?? ??? ?? AWS ?? ?? AWS Cloud 9
- 12. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. ?? ?? ?? - Truffle ?? ???? Step1 Step2 Step3 Step4 Step5 Step6 Smart Contract ?? Ganache ??? ?? ?? ????? ?? ?? ??? ?? AWS ?? ??
- 13. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. ©À©¤©¤ contracts ©¦ ©À©¤©¤ migrations ©¦ ©À©¤©¤ src ©¦ ©À©¤©¤ test ©¦ ©¸©¤©¤ truffle.js ? Truffle Configuration ?? ???? ??? ????? ???? ????? /truffle.js ? ?? ? Solidity ?? ??? ?? ?? ?? ? ??? ????? ???? ????? Deploy ?? Javascript ?? ? ?? ????? ?? ?? ? ??? Contract ? Unit Test ?? ??? ???? ?? ?? ???? Step1 Step2 Step3 Step4 Step5 Step6 Smart Contract ?? Ganache ??? ?? ?? ????? ?? ?? ??? ?? AWS ?? ??
- 14. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. ??? ???? ?? pragma solidity ^0.4.24; contract LeaseProperty { address[16] public lessees; // Lease a property function lease(uint propertyId) public returns (uint) { require(propertyId >= 0 && propertyId <= 15); lessees[propertyId] = msg.sender; return propertyId; } // Retrieving the lessees function getLessees() public view returns (address[16]) { return lessees; } } 16? address ?? propertyId? ??? address? ??? SET lessees ?? GET contracts / LeaseProperty.sol ?? ???? Step1 Step2 Step3 Step4 Step5 Step6 Smart Contract ?? Ganache ??? ?? ?? ????? ?? ?? ??? ?? AWS ?? ??
- 15. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Set Get ????? ???? ???? ? ????? ???? ???? ? ????? ???. (???? ??, SendTransaction ?) ????? ?? X Value(ETH), Gas ?? Value(ETH), Gas ???? ??. Hex string ??? ????. Hex string ?? ????. Transaction? Mining???? callback ??? ???? ???. get ??? ???? callback ??? ???? ??? ? ??. ??? Transaction? Mining???? ???? ?? ?? ????. callback ??? ???? ?? ????. ????? ? ??? ?? ???? ???? swarm? ?? p2p ????? ???? ?? ??. [??] Set vs Get ?? ???? Step1 Step2 Step3 Step4 Step5 Step6 Smart Contract ?? Ganache ??? ?? ?? ????? ?? ?? ??? ?? AWS ?? ??
- 16. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Ganache ??? ?? ?? ???? Step1 Step2 Step3 Step4 Step5 Step6 Smart Contract ?? Ganache ??? ?? ?? ????? ?? ?? ??? ?? AWS ?? ??
- 17. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. ?? ????? ?? ©À©¤©¤ contracts ©¦ ©À©¤©¤ migrations ©¦ ©À©¤©¤ src ©¦ ©À©¤©¤ js ©¦ ©¦ ©¸©¤ app.js ©¦ ©¦ : ©¦ ©¸©¤©¤ index.html ©¦ ©À©¤©¤ test ©¦ ©¸©¤©¤ truffle.js ? ?? ????? ?? ?? ? ????? ?? ? Web3, Contract ?? ? ?? ??? ?? ? ?? ??? lease() ??? ???? ?? ?? ? ?? UI ???? ?? ???? Step1 Step2 Step3 Step4 Step5 Step6 Smart Contract ?? Ganache ??? ?? ?? ????? ?? ?? ??? ?? AWS ?? ??
- 18. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. ????? ?? ???? Step1 Step2 Step3 Step4 Step5 Step6 Smart Contract ?? Ganache ??? ?? ?? ????? ?? ?? ??? ?? AWS ?? ??
- 19. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. ?? ???? Step1 Step2 Step3 Step4 Step5 Step6 Smart Contract ?? Ganache ??? ?? ?? ????? ?? ?? ??? ?? AWS ?? ?? ¢Ú ¢Û ¢Ü ¢Ù Ganache Mnemonic?? Account???? ????? ?? (1/3)
- 20. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. ¢Ý ¢Þ ¢ß ¢à ¢á Ganache TestRPC ?? ????? ?? (2/3) ?? ???? Step1 Step2 Step3 Step4 Step5 Step6 Smart Contract ?? Ganache ??? ?? ?? ????? ?? ?? ??? ?? AWS ?? ??
- 21. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. ¡¯Lease¡¯ ?? ??? ???? ?? ?? ????? ?? (3/3) ?? ???? Step1 Step2 Step3 Step4 Step5 Step6 Smart Contract ?? Ganache ??? ?? ?? ????? ?? ?? ??? ?? AWS ?? ??
- 22. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. AWS ?? ?? ?? JSON RPC Private Key: Afd2168f63635b5235¡.. RPC : http://<RPC-Endpoint>:8545 ???? ?? ??? ???? EVM + ???? ???? Dapp Smart Contract JSON RPC ??? ??? ?? ???? Step1 Step2 Step3 Step4 Step5 Step6 Smart Contract ?? Ganache ??? ?? ?? ????? ?? ?? ??? ?? AWS ?? ??
- 23. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. truffle.js (truffle ????) const HDWalletProvider = require("truffle-hdwallet-provider-privkey"); const privateKeys = ["afd2168f63635b5235cc8b4d69730faa4ffbea5cfcfab7b7d7625f91656e7d9f"]; module.exports = { ¡ networks: { awsNetwork: { provider: () => { return new HDWalletProvider(privateKeys, "http://<RPC-Endpoint>:8545") }, network_id: 1500, gas: 300000 } Provider: ??? RPC URL privateKeys: ?? ?? Account? ???? ? $ truffle migrate ¨Cnetwork awsNetwork AWS ?? ?? ?? ?? ???? Step1 Step2 Step3 Step4 Step5 Step6 Smart Contract ?? Ganache ??? ?? ?? ????? ?? ?? ??? ?? AWS ?? ??
- 24. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. https://github.com/awslego/house-rental
- 25. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Quiz!! ??? ??? AWS Credit ??! Feats. Amazon Polly ??
- 26. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Quiz! ?? ? ???? ??? ?? ????? ??? ? 1. ???? 2. ???? 3. ???? 4. ? ?? ??. ?? : 3. ????
- 27. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Quiz! ?? ? ???? ??? ?? Framework? ? 1. Travel 2. Trumph 3. Truffle 4. Trouble ?? : 3. Truffle
- 28. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Quiz! ?? ? ???? ??? ?? ???? ???? ????? ? 1. Galashow 2. Ganache 3. GanaChocolate 4. ? ?? ??. ?? : 2. Ganache
- 29. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Quiz! ?? ? ??? ????? ?? ?? ???? ? 1. Metallica 2. Metal Mask 3. Meta Mask 4. Iron Mask ?? : 3. Meta Mask
- 30. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Advanced dAPP : CrowdFund ??
- 31. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. CrowdFund ??? ?? ? ?? ???? ?? ¡°MISSION: IMPOSSIBLE FALLOUT" ??? ?? ???? ?? ???? ???? ???. ?? ??? ???? ?? 500 ??? ?????.
- 32. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. CrowdFund ??? ?? ? ???? 1. ???? ??? ????, ??? ??? ???? ??(??)? ????. 2. ?? ??? ?? ??? 1:1? ??. 3. ?? ?? ?? ??? ???? ?? ????? ?? ??? ????. 4. ?? ?? ?? ??? ???? ??? ?????? ??? ??? ????.
- 33. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. CrowdFund ??? ???? WAS Ethereum Node EVM JSON RPC Smart Contract Node Node P2P ??? dAPP
- 34. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. ¡®???? ??¡¯ ???? A ? ? ? ? A?? ?? ?? ¢Û sendTransaction ¢Ü (fallback) ¢Ý event Watch ??? ¢Ù getFundAmount ¢Ú getTokenAmount ?? ?? ?? ?? ?? ?? ?? ¢Þ withdraw ?? ?? SET GET ??? ?? Token Contract ?? ?? ?? A 100 TDs ?? ?? ?? A 100 ETH CrowdFund Contract ??? A B C ???? ?? ??? ?? ?? ?? : 500
- 35. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. [??] Blockchain Account ? ??? Account? ??. EOA, CA Externally Owned Account (EOA) User Create or Import ??????? ?? Address Private Key Balance Contract Account (CA) Address Code Balance ??? ?? ???? ??
- 36. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. ?? ?? ?? ¨C Account ??? ?? ??? ?? ?? ?? Externally Owned Account (EOA) Contract Account (CA) ?????? ?? ?????? ?? ? ? ? ? ?
- 37. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. ?? ?? ?? - https://github.com/awslego/crowdfunding
- 38. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. ?? ?? ?? - http://remix.ethereum.org 1 2
- 39. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. ?? ?? ?? ¨C ?? ?? ? ?? ?? $ git clone https://github.com/awslego/crowdfunding $ cd crowdfunding $ npm install npm start $ node -v $ npm install express -g ¡ù ?? ?? ?? http://127.0.0.1:3000 Node ??// ???? https://nodejs.org/ko/download/ Express ?? ?? ???? ??? ?? ?? ? ??
- 40. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. ?? ?? ?? ¨C Directory ?? /bin/www: ?? ??? ?? ??? ??. ????? ???? ??? ??? app.js ??? ??? ??? HTTP ??? ???? ??? ???? /routes: ???? ?? ?? ??? ??? ?? ??? ??? ??? ??? ?? /node_modules : ??? ?? ?? ??. package.json ??? ?? dependencies ?? ??? ??? ??? ?????? node_modules ??? ?? app.js: /bin/www ?? ???? ????? ??? ?? ?? ?? /public: ?? ??? ?? ???? ?????? ??, ??? ??, ????? ? /views: ??? Jade ??. ??? ?? ? redner()???? ?? /dAPP: web3? ???? ?? ?????
- 41. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. CrowdFund ??? ?? ??? ?? ( http://localhost:3000/makers )??? ?? ( http://localhost:3000/users ) CrowdFund ???? ?? ?? ?? ??? ?? ?? (ETH) ?? ?? ?? (ETH)
- 42. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. dAPP : CrowdFund ??(7??)
- 43. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Step1 : ERC20 Token ???? ?? Token ???? ??(?)? ??? ??. Main ???? WalletCompatibleToken.sol ? ???? Fund ? ?? ??? ???. * Token ???? ?? ???? 1. tokenName : FallOut Token 2. tokenSymbol : TDs 3. decimalUnits : 0 4. InitialSupply : 1000 ??? ???? ????? ????.
- 44. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Step1 : ERC20 Token ???? ?? CAABI
- 45. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Step2 : CrowdFund ???? ?? CrowdFund.sol ? ???? ??? ????? ????. * CrowdFund ???? ?? ???? 1. IfSuccessfulSendTo : ??? ??(?) 2. fundingGoalInEthers : 500 3. durationInMinutes : 10 4. etherCostOfEachToken : 1 5. addressOfTokenUsedAsReward : Token ????? ??(?) ??? ???? ????? ????.
- 46. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Step2 : CrowdFund ???? ?? CA ABI
- 47. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Step3 : CrowdFund ????? Token ?? ?? ??? 50%? 500 Token? CrowdFund ????? ????. ??? ???? ??? ????. * Transfer ????? ?? 1. _to : CrowdFund ???? ?? (?) 2. _value : 500 ???? CrowdFund ? ???? ?, Token? ???? ????? CrowdFund ? Token ? ???? ??.
- 48. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Step4 : CrowdFund ?? ?? http://localhost:3000/users CrowdFund ????(?) ?? ?? ?? ?? ?? (ETH) ??? ???? ?? ?? ???? ????. CrowdFund ??? ???? ?? ???? ????.
- 49. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Step5 : CrowdFund ? ?? CrowdFund ????? ??? ????. http://localhost:3000/users/join ??? ?? (ETH) ???(?)? ?? ???(?) ????? Passphrase ??? ???? ?? ??? ??.
- 50. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. sendTransaction(C,10) ( ???? ) Quiz msg.sender? ????? CrowdFund Token Contract msg.sender = ? transfer(A,10) ( ??? ) function () payable external { require(!crowdsaleClosed); uint amount = msg.value; balanceOf[msg.sender] += amount; amountRaised += amount; tokenReward.transfer(msg.sender, amount / price); FundTransfer(msg.sender, amount, true); } function transfer(address _to, uint256 _value) public { require(_value <= balanceOf[msg.sender]); require(balanceOf[_to] + _value >= balanceOf[_to] ); balanceOf[msg.sender] -= _value; balanceOf[_to] += _value; Transfer(msg.sender,_to,_value); } msg.sender = ?
- 51. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Step6 : CrowdFund ? ??? ?? ?? http://localhost:3000/users/<??? ??(?)> CrowdFund ?? ?? ?? ?? ?, ???(?)? ?? ?? ???? ?? ?? ??? ????. ?? ?, ?? ?? ?? (ETH)
- 52. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Step7 : CrowdFund ??? ?? ??? ???? ????? ???? ????. http://localhost:3000/makers ?? ???, ??? ??(?)?? ??? ?? safeWithdrawal() ?? checkGoalReached() : ?? ?? ?? ?? ?? ?? YES YES NO ??? ???? ?? ??? ???? ?? safeWithdrawal() ?? ?, ???? ?? ?? (ETH)
- 53. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. ?? ?? ??
- 54. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. crowdfunding/solidity/CrowdFund.sol 1 2
- 55. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. crowdfunding/solidity/CrowdFund.sol ?? ??? ???? ??? ?? ?? ?? ?? (??) ??? ??? ?? (?) ??? ??? ?? ??. ???? ??? ??? ??? 1
- 56. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. crowdfunding/solidity/CrowdFund.sol 2 3 4 1
- 57. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. crowdfunding/solidity/CrowdFund.sol 1 2
- 58. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. crowdfunding/solidity/CrowdFund.sol 1 2
- 59. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. crowdfunding/solidity/WalletCompatibleToken.sol 1
- 60. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. crowdfunding/dapp/constant.js
- 61. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. crowdfunding/dapp/eth.js 1
- 62. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. crowdfunding/dapp/eth.js 1 2
- 63. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. crowdfunding/dapp/eth.js 1
- 64. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. crowdfunding/dapp/eth.js 1
- 65. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. crowdfunding/dapp/eth.js 1
- 66. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. crowdfunding/dapp/eth.js 1
- 67. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. ??? ??
- 68. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Quiz ??/?? ??? ??????. ?? CrowdFund ???? ??? ???? ????? ?? ??? ??? ??? ???? ?????, ? UI? ???? ??? ????!!! ? ??? ???? Pull Request? ?????.
- 69. ? 2018, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Q&A ? ?? ?, ??? ??? ??? ?? ? ??? ??? ????. ? #AWSDevDay ?? ??? ??? ?????!