Revert "deleted old client and adapter dirs, made singular and updated Cargo.toml"

This reverts commit 7caf15dc507b49b25f7a66cb7972de4b1fb485fd.

Cargo.toml

@@ -101,6 +101,26 @@ features = ["bundled", "sqlcipher"]
 default = ["bitcoin", "secp256k1", "electrum-client"]
 sol = ["solana-sdk", "solana-client", "tokio-tungstenite", "tokio", "ed25519-dalek" ]
 
+[[bin]]
+name = "lisp"
+path = "lisp/lisp.rs"
+
+[[bin]]
+name = "mimc"
+path = "src/old/mimc.rs"
+
+[[bin]]
+name = "mint-classic"
+path = "src/bin/mint-classic.rs"
+
+[[bin]]
+name = "spend-classic"
+path = "src/bin/spend-classic.rs"
+
+[[bin]]
+name = "tx"
+path = "src/bin/tx.rs"
+
 [[bin]]
 name = "gatewayd"
 path = "src/bin/gatewayd.rs"

src/client/client_old.rs

@@ -0,0 +1,415 @@
+use crate::blockchain::{rocks::columns, Rocks, RocksColumn, Slab};
+use crate::cli::TransferParams;
+use crate::crypto::{
+    load_params,
+    merkle::{CommitmentTree, IncrementalWitness},
+    merkle_node::MerkleNode,
+    note::{EncryptedNote, Note},
+    nullifier::Nullifier,
+    save_params, setup_mint_prover, setup_spend_prover,
+};
+use crate::rpc::adapters::user_adapter::UserAdapter;
+use crate::rpc::jsonserver;
+use crate::serial::Encodable;
+use crate::serial::{deserialize, Decodable};
+use crate::service::{CashierClient, GatewayClient, GatewaySlabsSubscriber};
+use crate::state::{state_transition, ProgramState, StateUpdate};
+use crate::wallet::WalletPtr;
+use crate::{tx, Result};
+
+use super::{ClientFailed, ClientResult};
+
+use async_executor::Executor;
+use bellman::groth16;
+use bls12_381::Bls12;
+use log::*;
+use rusqlite::Connection;
+
+use async_std::sync::{Arc, Mutex};
+use futures::FutureExt;
+use std::net::SocketAddr;
+use std::path::PathBuf;
+
+pub struct Client {
+    state: State,
+    secret: jubjub::Fr,
+    mint_params: bellman::groth16::Parameters<Bls12>,
+    spend_params: bellman::groth16::Parameters<Bls12>,
+    gateway: GatewayClient,
+}
+
+impl Client {
+    pub fn new(
+        secret: jubjub::Fr,
+        rocks: Arc<Rocks>,
+        gateway_addrs: (SocketAddr, SocketAddr),
+        params_paths: (PathBuf, PathBuf),
+        wallet_path: PathBuf,
+    ) -> Result<Self> {
+        let slabstore = RocksColumn::<columns::Slabs>::new(rocks.clone());
+        let merkle_roots = RocksColumn::<columns::MerkleRoots>::new(rocks.clone());
+        let nullifiers = RocksColumn::<columns::Nullifiers>::new(rocks);
+
+        let mint_params_path = params_paths.0.to_str().unwrap_or("mint.params");
+        let spend_params_path = params_paths.1.to_str().unwrap_or("spend.params");
+
+        // Auto create trusted ceremony parameters if they don't exist
+        if !params_paths.0.exists() {
+            let params = setup_mint_prover();
+            save_params(mint_params_path, &params)?;
+        }
+        if !params_paths.1.exists() {
+            let params = setup_spend_prover();
+            save_params(spend_params_path, &params)?;
+        }
+
+        // Load trusted setup parameters
+        let (mint_params, mint_pvk) = load_params(mint_params_path)?;
+        let (spend_params, spend_pvk) = load_params(spend_params_path)?;
+
+        let state = State {
+            tree: CommitmentTree::empty(),
+            merkle_roots,
+            nullifiers,
+            mint_pvk,
+            spend_pvk,
+            wallet_path,
+        };
+
+        // create gateway client
+        debug!(target: "CLIENT", "Creating GatewayClient");
+        let gateway = GatewayClient::new(gateway_addrs.0, gateway_addrs.1, slabstore)?;
+
+        Ok(Self {
+            state,
+            secret,
+            mint_params,
+            spend_params,
+            gateway,
+        })
+    }
+
+    pub async fn start(&mut self) -> Result<()> {
+        self.gateway.start().await?;
+        Ok(())
+    }
+
+    pub async fn connect_to_cashier(
+        &mut self,
+        executor: Arc<Executor<'_>>,
+        wallet: WalletPtr,
+        cashier_addr: SocketAddr,
+        rpc_url: SocketAddr,
+    ) -> Result<()> {
+        // create cashier client
+        debug!(target: "CLIENT", "Creating cashier client");
+        let mut cashier_client = CashierClient::new(cashier_addr)?;
+
+        // start subscribing
+        debug!(target: "CLIENT", "Start subscriber");
+        let gateway_slabs_sub: GatewaySlabsSubscriber =
+            self.gateway.start_subscriber(executor.clone()).await?;
+
+        // channels to request transfer from adapter
+        let (transfer_req_send, transfer_req_recv) = async_channel::unbounded::<TransferParams>();
+        let (transfer_rep_send, transfer_rep_recv) = async_channel::unbounded::<ClientResult<()>>();
+
+        // channels to request deposit from adapter, send DRK key and receive BTC key
+        let (deposit_req_send, deposit_req_recv) =
+            async_channel::unbounded::<jubjub::SubgroupPoint>();
+        let (deposit_rep_send, deposit_rep_recv) =
+            async_channel::unbounded::<ClientResult<bitcoin::util::address::Address>>();
+
+        // channel to request withdraw from adapter, send BTC key and receive DRK key
+        let (withdraw_req_send, withdraw_req_recv) = async_channel::unbounded::<String>();
+        let (withdraw_rep_send, withdraw_rep_recv) =
+            async_channel::unbounded::<ClientResult<jubjub::SubgroupPoint>>();
+
+        // start cashier_client
+        cashier_client.start().await?;
+
+        let adapter = Arc::new(UserAdapter::new(
+            wallet.clone(),
+            (transfer_req_send.clone(), transfer_rep_recv.clone()),
+            (deposit_req_send.clone(), deposit_rep_recv.clone()),
+            (withdraw_req_send.clone(), withdraw_rep_recv.clone()),
+        )?);
+
+        // start the rpc server
+        debug!(target: "CLIENT", "Start RPC server");
+        let io = Arc::new(adapter.handle_input()?);
+        let _ = jsonserver::start(executor.clone(), rpc_url, io).await?;
+
+        self.futures_broker(
+            &mut cashier_client,
+            wallet,
+            gateway_slabs_sub.clone(),
+            deposit_req_recv.clone(),
+            deposit_rep_send.clone(),
+            withdraw_req_recv.clone(),
+            withdraw_rep_send.clone(),
+            transfer_req_recv.clone(),
+            transfer_rep_send.clone(),
+        )
+        .await?;
+
+        Ok(())
+    }
+
+    pub async fn futures_broker(
+        &mut self,
+        cashier_client: &mut CashierClient,
+        wallet: WalletPtr,
+        gateway_slabs_sub: async_channel::Receiver<Slab>,
+        deposit_req: async_channel::Receiver<jubjub::SubgroupPoint>,
+        deposit_rep: async_channel::Sender<ClientResult<bitcoin::util::address::Address>>,
+        withdraw_req: async_channel::Receiver<String>,
+        withdraw_rep: async_channel::Sender<ClientResult<jubjub::SubgroupPoint>>,
+        transfer_req: async_channel::Receiver<TransferParams>,
+        transfer_rep: async_channel::Sender<ClientResult<()>>,
+    ) -> Result<()> {
+        loop {
+            futures::select! {
+                slab = gateway_slabs_sub.recv().fuse() => {
+                    let slab = slab?;
+                    let tx = tx::Transaction::decode(&slab.get_payload()[..])?;
+                    let update = state_transition(&self.state, tx)?;
+                    self.state.apply(update, wallet.clone()).await?;
+                }
+                deposit_addr = deposit_req.recv().fuse() => {
+                    let btc_public = cashier_client.get_address(deposit_addr?).await.map_err(|err| {ClientFailed::from(err)});
+
+                    if let Err(err) = btc_public {
+                        deposit_rep.send(Err(err)).await?;
+                    } else {
+                        if let Some(btc_addr) = btc_public? {
+                            deposit_rep.send(Ok(btc_addr)).await?;
+                        }else {
+                            deposit_rep.send(Err(ClientFailed::UnableToGetDepositAddress)).await?;
+                        }
+                    }
+                }
+                withdraw_addr = withdraw_req.recv().fuse() => {
+                    let drk_public = cashier_client.withdraw(withdraw_addr?).await.map_err(|err| {ClientFailed::from(err)});
+
+                    if let Err(err) = drk_public {
+                        withdraw_rep.send(Err(err)).await?;
+                    } else {
+                        if let Some(drk_addr) = drk_public? {
+                            withdraw_rep.send(Ok(drk_addr)).await?;
+                        }else {
+                            withdraw_rep.send(Err(ClientFailed::UnableToGetWithdrawAddress)).await?;
+                        }
+                    }
+                }
+                transfer_params = transfer_req.recv().fuse() => {
+
+                    let result = self.transfer(
+                        transfer_params?,
+                        wallet.clone()
+                    ).await;
+
+                    if let Err(err) = result {
+                        transfer_rep.send(Err(err)).await?;
+                    } else {
+                        transfer_rep.send(Ok(())).await?;
+                    }
+
+                }
+
+            }
+        }
+    }
+
+    pub async fn transfer(
+        &mut self,
+        transfer_params: TransferParams,
+        wallet: WalletPtr,
+    ) -> ClientResult<()> {
+        let pub_key = transfer_params.pub_key;
+
+        let address = bs58::decode(pub_key.clone())
+            .into_vec()
+            .map_err(|_| ClientFailed::UnvalidAddress(pub_key.clone()))?;
+
+        let address: jubjub::SubgroupPoint =
+            deserialize(&address).map_err(|_| ClientFailed::UnvalidAddress(pub_key))?;
+
+        let amount = transfer_params.amount;
+
+        if amount <= 0.0 {
+            return Err(ClientFailed::UnvalidAmount(amount as u64));
+        }
+
+        // check if there are coins
+        let own_coins = wallet.get_own_coins()?;
+
+        if own_coins.is_empty() {
+            return Err(ClientFailed::NotEnoughValue(0));
+        }
+
+        let witness = &own_coins[0].3;
+        let merkle_path = witness.path().unwrap();
+
+        // Construct a new tx spending the coin
+        let builder = tx::TransactionBuilder {
+            clear_inputs: vec![],
+            inputs: vec![tx::TransactionBuilderInputInfo {
+                merkle_path,
+                secret: self.secret.clone(),
+                note: own_coins[0].1.clone(),
+            }],
+            // We can add more outputs to this list.
+            // The only constraint is that sum(value in) == sum(value out)
+            outputs: vec![tx::TransactionBuilderOutputInfo {
+                value: amount as u64,
+                asset_id: 1,
+                public: address,
+            }],
+        };
+        // Build the tx
+        let mut tx_data = vec![];
+        {
+            let tx = builder.build(&self.mint_params, &self.spend_params);
+            tx.encode(&mut tx_data).expect("encode tx");
+        }
+
+        // build slab from the transaction
+        let slab = Slab::new(tx_data);
+
+        self.gateway.put_slab(slab).await?;
+
+        Ok(())
+    }
+
+    pub async fn connect_to_subscriber(
+        client: Arc<Mutex<Client>>,
+        executor: Arc<Executor<'_>>,
+        wallet: WalletPtr,
+    ) -> Result<()> {
+        // start subscribing
+        debug!(target: "CLIENT", "Start subscriber");
+        let gateway_slabs_sub: GatewaySlabsSubscriber = client
+            .lock()
+            .await
+            .gateway
+            .start_subscriber(executor.clone())
+            .await?;
+
+        loop {
+            let slab = gateway_slabs_sub.recv().await?;
+            let tx = tx::Transaction::decode(&slab.get_payload()[..])?;
+            let mut client = client.lock().await;
+            let update = state_transition(&client.state, tx)?;
+            client.state.apply(update, wallet.clone()).await?;
+        }
+    }
+}
+
+pub struct State {
+    // The entire merkle tree state
+    pub tree: CommitmentTree<MerkleNode>,
+    // List of all previous and the current merkle roots
+    // This is the hashed value of all the children.
+    pub merkle_roots: RocksColumn<columns::MerkleRoots>,
+    // Nullifiers prevent double spending
+    pub nullifiers: RocksColumn<columns::Nullifiers>,
+    // Mint verifying key used by ZK
+    pub mint_pvk: groth16::PreparedVerifyingKey<Bls12>,
+    // Spend verifying key used by ZK
+    pub spend_pvk: groth16::PreparedVerifyingKey<Bls12>,
+    // TODO: remove this
+    wallet_path: PathBuf,
+}
+
+impl ProgramState for State {
+    fn is_valid_cashier_public_key(&self, _public: &jubjub::SubgroupPoint) -> bool {
+        // TODO: use walletdb instead of connecting with sqlite directly
+        let conn =
+            Connection::open(self.wallet_path.clone()).expect("Connect to database");
+        let mut stmt = conn
+            .prepare("SELECT key_public FROM cashier WHERE key_public IN (SELECT key_public)")
+            .expect("Generate statement");
+        stmt.exists([1i32]).expect("Read database")
+        // do actual validity check
+    }
+
+    fn is_valid_merkle(&self, merkle_root: &MerkleNode) -> bool {
+        self.merkle_roots
+            .key_exist(*merkle_root)
+            .expect("Check if the merkle_root valid")
+    }
+
+    fn nullifier_exists(&self, nullifier: &Nullifier) -> bool {
+        self.nullifiers
+            .key_exist(nullifier.repr)
+            .expect("Check if nullifier exists")
+    }
+
+    // load from disk
+    fn mint_pvk(&self) -> &groth16::PreparedVerifyingKey<Bls12> {
+        &self.mint_pvk
+    }
+
+    fn spend_pvk(&self) -> &groth16::PreparedVerifyingKey<Bls12> {
+        &self.spend_pvk
+    }
+}
+
+impl State {
+    pub async fn apply(&mut self, update: StateUpdate, wallet: WalletPtr) -> Result<()> {
+        // Extend our list of nullifiers with the ones from the update
+        for nullifier in update.nullifiers {
+            self.nullifiers.put(nullifier, vec![] as Vec<u8>)?;
+        }
+
+        // Update merkle tree and witnesses
+        for (coin, enc_note) in update.coins.into_iter().zip(update.enc_notes.into_iter()) {
+            // Add the new coins to the merkle tree
+            let node = MerkleNode::from_coin(&coin);
+            self.tree.append(node).expect("Append to merkle tree");
+
+            // Keep track of all merkle roots that have existed
+            self.merkle_roots.put(self.tree.root(), vec![] as Vec<u8>)?;
+
+            // Also update all the coin witnesses
+            for witness in wallet.witnesses.lock().await.iter_mut() {
+                witness.append(node).expect("Append to witness");
+            }
+
+            if let Some((note, secret)) = self.try_decrypt_note(wallet.clone(), enc_note).await {
+                // We need to keep track of the witness for this coin.
+                // This allows us to prove inclusion of the coin in the merkle tree with ZK.
+                // Just as we update the merkle tree with every new coin, so we do the same with
+                // the witness.
+
+                // Derive the current witness from the current tree.
+                // This is done right after we add our coin to the tree (but before any other
+                // coins are added)
+
+                // Make a new witness for this coin
+                let witness = IncrementalWitness::from_tree(&self.tree);
+
+                wallet.put_own_coins(coin.clone(), note.clone(), witness.clone(), secret)?;
+            }
+        }
+        Ok(())
+    }
+
+    async fn try_decrypt_note(
+        &self,
+        wallet: WalletPtr,
+        ciphertext: EncryptedNote,
+    ) -> Option<(Note, jubjub::Fr)> {
+        let secret = wallet.get_private().ok()?;
+        match ciphertext.decrypt(&secret) {
+            Ok(note) => {
+                // ... and return the decrypted note for this coin.
+                return Some((note, secret.clone()));
+            }
+            Err(_) => {}
+        }
+        // We weren't able to decrypt the note with our key.
+        None
+    }
+}

src/rpc/adapters_old/cashier_adapter.rs

@@ -0,0 +1,78 @@
+use crate::wallet::CashierDb;
+use crate::Result;
+use async_std::sync::Arc;
+
+pub struct CashierAdapter {
+    pub wallet: Arc<CashierDb>,
+}
+
+impl CashierAdapter {
+    pub fn new(wallet: Arc<CashierDb>) -> Result<Self> {
+        Ok(Self { wallet })
+    }
+
+    pub fn handle_input(self: Arc<Self>) -> Result<jsonrpc_core::IoHandler> {
+        let mut io = jsonrpc_core::IoHandler::new();
+        io.add_sync_method("cashier_hello", |_| {
+            Ok(jsonrpc_core::Value::String("hello world!".into()))
+        });
+        Ok(io)
+        //    let self1 = self.clone();
+        //    io.add_method("get_key", move |_| {
+        //        let self2 = self1.clone();
+        //        async move {
+        //            let pub_key = self2.get_key()?;
+        //            Ok(jsonrpc_core::Value::String(pub_key))
+        //        }
+        //    });
+
+        //    let self1 = self.clone();
+        //    io.add_method("get_cash_public", move |_| {
+        //        let self2 = self1.clone();
+        //        async move {
+        //            let cash_key = self2.get_cash_public()?;
+        //            Ok(jsonrpc_core::Value::String(cash_key))
+        //        }
+        //    });
+
+        //    let self1 = self.clone();
+        //    io.add_method("get_info", move |_| {
+        //        let self2 = self1.clone();
+        //        async move {
+        //            self2.get_info();
+        //            Ok(jsonrpc_core::Value::Null)
+        //        }
+        //    });
+
+        //    let self1 = self.clone();
+        //    io.add_method("stop", move |_| {
+        //        let self2 = self1.clone();
+        //        async move {
+        //            self2.stop();
+        //            Ok(jsonrpc_core::Value::Null)
+        //        }
+        //    });
+        //    let self1 = self.clone();
+
+        //    io.add_method("create_wallet", move |_| {
+        //        let self2 = self1.clone();
+        //        async move {
+        //            self2.init_db()?;
+        //            Ok(jsonrpc_core::Value::String(
+        //                "wallet creation successful".into(),
+        //            ))
+        //        }
+        //    });
+
+        //    let self1 = self.clone();
+        //    io.add_method("key_gen", move |_| {
+        //        let self2 = self1.clone();
+        //        async move {
+        //            self2.key_gen()?;
+        //            Ok(jsonrpc_core::Value::String(
+        //                "key generation successful".into(),
+        //            ))
+        //        }
+        //    });
+    }
+}

src/rpc/adapters_old/mod.rs

@@ -0,0 +1,4 @@
+pub mod cashier_adapter;
+pub mod user_adapter;
+
+pub use user_adapter::{UserAdapter, UserAdapterPtr};

src/rpc/adapters_old/user_adapter.rs

@@ -0,0 +1,245 @@
+use crate::cli::{TransferParams, WithdrawParams};
+use crate::client::ClientResult;
+use crate::serial::serialize;
+use crate::service::btc::PubAddress;
+use crate::wallet::WalletDb;
+use crate::{Error, Result};
+
+use log::*;
+
+use async_std::sync::Arc;
+
+pub type UserAdapterPtr = Arc<UserAdapter>;
+
+pub type TransferChannel = (
+    async_channel::Sender<TransferParams>,
+    async_channel::Receiver<ClientResult<()>>,
+);
+
+pub type DepositChannel = (
+    async_channel::Sender<jubjub::SubgroupPoint>,
+    async_channel::Receiver<ClientResult<bitcoin::util::address::Address>>,
+);
+
+pub type WithdrawChannel = (
+    async_channel::Sender<String>,
+    async_channel::Receiver<ClientResult<jubjub::SubgroupPoint>>,
+);
+
+pub struct UserAdapter {
+    pub wallet: Arc<WalletDb>,
+    transfer_channel: TransferChannel,
+    deposit_channel: DepositChannel,
+    withdraw_channel: WithdrawChannel,
+}
+
+impl UserAdapter {
+    pub fn new(
+        wallet: Arc<WalletDb>,
+        transfer_channel: TransferChannel,
+        deposit_channel: DepositChannel,
+        withdraw_channel: WithdrawChannel,
+    ) -> Result<Self> {
+        debug!(target: "RPC USER ADAPTER", "new() [CREATING NEW WALLET]");
+        Ok(Self {
+            wallet,
+            transfer_channel,
+            deposit_channel,
+            withdraw_channel,
+        })
+    }
+
+    pub fn handle_input(self: Arc<Self>) -> Result<jsonrpc_core::IoHandler> {
+        let mut io = jsonrpc_core::IoHandler::new();
+
+        io.add_sync_method("say_hello", |_| {
+            Ok(jsonrpc_core::Value::String("hello world!".into()))
+        });
+
+        let self1 = self.clone();
+        io.add_method("get_key", move |_| {
+            let self2 = self1.clone();
+            async move {
+                let pub_key = self2.get_key()?;
+                Ok(jsonrpc_core::Value::String(pub_key))
+            }
+        });
+
+        let self1 = self.clone();
+        io.add_method("get_cash_public", move |_| {
+            let self2 = self1.clone();
+            async move {
+                let cash_key = self2.get_cash_public()?;
+                Ok(jsonrpc_core::Value::String(cash_key))
+            }
+        });
+
+        let self1 = self.clone();
+        io.add_method("get_info", move |_| {
+            let self2 = self1.clone();
+            async move {
+                self2.get_info();
+                Ok(jsonrpc_core::Value::Null)
+            }
+        });
+
+        let self1 = self.clone();
+        io.add_method("stop", move |_| {
+            let self2 = self1.clone();
+            async move {
+                self2.stop();
+                Ok(jsonrpc_core::Value::Null)
+            }
+        });
+        let self1 = self.clone();
+
+        io.add_method("create_wallet", move |_| {
+            let self2 = self1.clone();
+            async move {
+                self2.init_db()?;
+                Ok(jsonrpc_core::Value::String(
+                    "wallet creation successful".into(),
+                ))
+            }
+        });
+
+        let self1 = self.clone();
+        io.add_method("key_gen", move |_| {
+            let self2 = self1.clone();
+            async move {
+                self2.key_gen()?;
+                Ok(jsonrpc_core::Value::String(
+                    "key generation successful".into(),
+                ))
+            }
+        });
+
+        let self1 = self.clone();
+        io.add_method("deposit", move |_| {
+            let self2 = self1.clone();
+            async move {
+                let btckey = self2.deposit().await?;
+                Ok(jsonrpc_core::Value::String(format!("{}", btckey)))
+            }
+        });
+
+        let self1 = self.clone();
+        io.add_method("transfer", move |params: jsonrpc_core::Params| {
+            let self2 = self1.clone();
+            async move {
+                let parsed: TransferParams = params.parse().unwrap();
+                let amount = parsed.amount.clone();
+                let address = parsed.pub_key.clone();
+                self2.transfer(parsed).await?;
+                Ok(jsonrpc_core::Value::String(format!(
+                    "transfered {} DRK to {}",
+                    amount, address
+                )))
+            }
+        });
+
+        let self1 = self.clone();
+        io.add_method("withdraw", move |params: jsonrpc_core::Params| {
+            let self2 = self1.clone();
+            async move {
+                let parsed: WithdrawParams = params.parse().unwrap();
+                let amount = parsed.amount;
+                let address = self2.withdraw(parsed).await?;
+                Ok(jsonrpc_core::Value::String(format!(
+                    "sending {} dbtc to provided address for withdrawing: {} ",
+                    amount, address
+                )))
+            }
+        });
+
+        Ok(io)
+    }
+
+    pub fn init_db(&self) -> Result<()> {
+        debug!(target: "RPC USER ADAPTER", "init_db() [START]");
+        self.wallet.init_db()?;
+        Ok(())
+    }
+
+    pub fn key_gen(&self) -> Result<()> {
+        debug!(target: "RPC USER ADAPTER", "key_gen() [START]");
+        let (public, private) = self.wallet.key_gen();
+        debug!(target: "RPC USER ADAPTER", "Created keypair...");
+        debug!(target: "RPC USER ADAPTER", "Attempting to write to database...");
+        self.wallet.put_keypair(public, private)?;
+        Ok(())
+    }
+
+    pub fn get_key(&self) -> Result<String> {
+        debug!(target: "RPC USER ADAPTER", "get_key() [START]");
+        let key_public = self.wallet.get_public()?;
+        let bs58_address = bs58::encode(serialize(&key_public)).into_string();
+        Ok(bs58_address)
+    }
+
+    pub fn get_cash_public(&self) -> Result<String> {
+        debug!(target: "RPC USER ADAPTER", "get_cash_public() [START]");
+        let cashier_public = self.wallet.get_cashier_public()?;
+        let bs58_address = bs58::encode(serialize(&cashier_public)).into_string();
+        Ok(bs58_address)
+    }
+
+    pub async fn deposit(&self) -> Result<PubAddress> {
+        debug!(target: "RPC USER ADAPTER", "deposit: START");
+        let (public, private) = self.wallet.key_gen();
+        self.wallet.put_keypair(public, private)?;
+        let dkey = self.wallet.get_public()?;
+        self.deposit_channel.0.send(dkey).await?;
+        self.deposit_channel
+            .1
+            .recv()
+            .await?
+            .map_err(|err| Error::from(err))
+    }
+
+    async fn transfer(&self, transfer_params: TransferParams) -> Result<()> {
+        self.transfer_channel.0.send(transfer_params).await?;
+
+        self.transfer_channel
+            .1
+            .recv()
+            .await?
+            .map_err(|err| Error::from(err))
+    }
+
+    async fn withdraw(&self, withdraw_params: WithdrawParams) -> Result<String> {
+        debug!(target: "RPC USER ADAPTER", "withdraw: START");
+        self.withdraw_channel
+            .0
+            .send(withdraw_params.pub_key)
+            .await?;
+
+        // receive dbtc address
+        let key = self
+            .withdraw_channel
+            .1
+            .recv()
+            .await?
+            .map_err(|err| Error::from(err))?;
+
+        // transfer the dbtc
+        let key = bs58::encode(serialize(&key)).into_string();
+        let mut transfer_params = TransferParams::new();
+        transfer_params.pub_key = key.clone();
+        transfer_params.amount = withdraw_params.amount;
+        self.transfer_channel.0.send(transfer_params).await?;
+        self.transfer_channel
+            .1
+            .recv()
+            .await?
+            .map_err(|err| Error::from(err))?;
+
+        Ok(key)
+    }
+
+    pub fn get_info(&self) {}
+
+    pub fn say_hello(&self) {}
+
+    pub fn stop(&self) {}
+}