Blockchain Withdraw: Coin

Sprint: 7

Outcome:

Users can do coin withdrawal from any wallet to favorite address

File destination:

{$Dena_Path}/app/model/withdraw.rb
{$Dena_Path}/app/workers/amqp/withdraw_coin.rb

Implementation description:

after withdraw was created by the user through the API, the hooked method will be called and send the hash message (withdraw data) to RabbitMq relevant queue.
the class is responsible to handle the hash message is: WithdrawCoin

1- finding the Withdraw by the id in the hash message if not, an error will be logged that not found a record in DB and exit
2- locking the Withdraw
3- check state of the Withdraw is processing, if not, an error will be logged and exit
4- check destination address was present, if not, an error will be logged, the Withdraw will be failed and exit
5- logging warning message that withdraw is ready for sending to blockchain
6- find an active hot wallet, if not, an error will be logged, the Withdraw will be skipped, and exit
7- check the balance of the active hot wallet, if not appropriate log error, skip the Withdraw and exit
8- create an object from WalletService by the active hot wallet
9- **WalletService** call `build_withdrawal!` for the withdraw and return transaction
10- the `txid` of the Withdraw being update by the Hash of the transaction
11- changing withdraw the state from `processing` to `confirming` with `dispatch` function
12- save the Withdraw in DB

graph TD
    A[API] --> |post request| B[withdraw model]
    B --> |hooked method| C(RabbitMq)
    D(withdraw coin) --> |hash message in queue| C
    D --> E((WalletService))

WalletService

this class using as a middleman for connecting to every coin wallet.
In the time of creation object, the adapter (the hand of this class to talk the crypto coin wallet) receives its config.
The aim of WalletService class is to union and structurize all crypto coin wallets implemented in the Peatio.

build_withdrawal! function

this method create transaction on blockchain by the help of adapter and specific its config

graph LR
    A(Peatio) -->|Blockchain stuffs| B[BlockchainService using adapter]
    
    A --> |Wallet Deposit/Withdraw| C[WalletService using adapter]
    B --> |Blockchain stuffs| D((Btc Blockchain))
    B --> |Blockchain stuffs| E((Eth Blockchain))
    B --> |Blockchain stuffs| F((...))
    B --> A

    C --> |Wallet Deposit/Withdraw| G((Btc Wallet))
    C --> |Wallet Deposit/Withdraw| H((Eth Wallet))
    C --> |Wallet Deposit/Withdraw| I((...))
    C --> A

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