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rpcserver.go
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rpcserver.go
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package main
import (
"context"
"encoding/binary"
"fmt"
"log"
"os"
"strconv"
"time"
"github.com/algorand/go-algorand-sdk/v2/crypto"
"github.com/algorand/go-algorand-sdk/v2/mnemonic"
"github.com/dancodery/algorand-state-channels/asrpc"
"github.com/dancodery/algorand-state-channels/payment"
"github.com/dancodery/algorand-state-channels/payment/testing"
"google.golang.org/protobuf/types/known/timestamppb"
)
type rpcServer struct {
// started int32
server *server
asrpc.UnimplementedASRPCServer
}
var _ asrpc.ASRPCServer = (*rpcServer)(nil)
func newRpcServer(s *server) *rpcServer {
return &rpcServer{
server: s,
}
}
func (r *rpcServer) Reset(ctx context.Context, in *asrpc.ResetRequest) (*asrpc.ResetResponse, error) {
timestamp_start := timestamppb.Now()
r.server.payment_channels_onchain_states = make(map[string]paymentChannelInfo)
r.server.payment_channels_offchain_states_log = make(map[string]map[int64]paymentChannelOffChainState)
r.server.algod_client = testing.GetAlgodClient()
// new: generate account from seed
seed_phrase := os.Getenv("SEED_PHRASE")
if seed_phrase == "" {
r.server.algo_account = crypto.GenerateAccount()
} else {
private_key, err := mnemonic.ToPrivateKey(seed_phrase)
if err != nil {
log.Fatalf("failed to generate account from seed: %v\n", err)
return nil, err
}
r.server.algo_account, err = crypto.AccountFromPrivateKey(private_key)
if err != nil {
log.Fatalf("failed to generate account from seed: %v\n", err)
return nil, err
}
}
fmt.Printf("\nReset executed\n")
fmt.Printf("My node ALGO address is: %v\n", r.server.algo_account.Address.String())
// fund account
testing.FundAccount(r.server.algod_client, r.server.algo_account.Address.String(), 10_000_000_000)
timestamp_end := timestamppb.Now()
runtime_recording := &asrpc.RuntimeRecording{
TimestampStart: timestamp_start,
TimestampEnd: timestamp_end,
}
return &asrpc.ResetResponse{
RuntimeRecording: runtime_recording,
}, nil
}
func (r *rpcServer) GetInfo(ctx context.Context, in *asrpc.GetInfoRequest) (*asrpc.GetInfoResponse, error) {
timestamp_start := timestamppb.Now()
algo_address := r.server.algo_account.Address.String()
algo_balance, err := r.server.getAlgoBalance(algo_address)
if err != nil {
return nil, err
}
timestamp_end := timestamppb.Now()
runtime_recording := &asrpc.RuntimeRecording{
TimestampStart: timestamp_start,
TimestampEnd: timestamp_end,
}
return &asrpc.GetInfoResponse{
AlgoAddress: algo_address,
AlgoBalance: algo_balance,
RuntimeRecording: runtime_recording,
}, nil
}
func (r *rpcServer) OpenChannel(ctx context.Context, in *asrpc.OpenChannelRequest) (*asrpc.OpenChannelResponse, error) {
timestamp_start := timestamppb.Now()
// 1. Create payment app
appID := payment.CreatePaymentApp(
r.server.algod_client,
r.server.algo_account,
in.PartnerNode.AlgoAddress,
in.PenaltyReserve,
in.DisputeWindow)
// 2. Fund payment app
payment.SetupPaymentApp(
r.server.algod_client,
appID,
r.server.algo_account,
in.FundingAmount)
fmt.Printf("\nCreated payment channel app with app_id: %v and funding amount: %v\n", appID, in.FundingAmount)
// 3. send notification to partner node
partner_response, err := sendRequest(in.PartnerNode.Host, P2PRequest{Command: "open_channel_request", Args: [][]byte{[]byte(strconv.Itoa(int(appID)))}})
if err != nil {
fmt.Printf("Error sending open channel request to partner node: %v\n", err)
return nil, err
}
// 4. read partner node's response
switch partner_response.Message {
case "approve":
// save the payment channel on chain state
onchain_state := &paymentChannelInfo{
app_id: appID,
partner_ip: in.PartnerNode.Host,
alice_address: r.server.algo_account.Address.String(),
bob_address: in.PartnerNode.AlgoAddress,
alice_onchain_balance: in.FundingAmount,
bob_onchain_balance: 0,
total_deposit: in.FundingAmount,
penalty_reserve: in.PenaltyReserve,
dispute_window: in.DisputeWindow,
}
r.server.payment_channels_onchain_states[in.PartnerNode.AlgoAddress] = *onchain_state
r.server.UpdateWatchtowerState()
// save the payment channel off chain state
off_chain_state := &paymentChannelOffChainState{
timestamp: time.Now().UnixNano(),
alice_balance: onchain_state.alice_onchain_balance,
bob_balance: onchain_state.bob_onchain_balance,
algorand_port: 4161,
app_id: onchain_state.app_id,
}
if r.server.payment_channels_offchain_states_log[in.PartnerNode.AlgoAddress] == nil {
r.server.payment_channels_offchain_states_log[in.PartnerNode.AlgoAddress] = make(map[int64]paymentChannelOffChainState)
}
r.server.payment_channels_offchain_states_log[in.PartnerNode.AlgoAddress][off_chain_state.timestamp] = *off_chain_state
// print all payment channel states
fmt.Printf("All Current Payment Channels: %+v\n\n", r.server.payment_channels_onchain_states)
case "reject":
fmt.Printf("Partner node rejected open channel request\n")
return nil, fmt.Errorf("partner node rejected open channel request")
default:
fmt.Printf("Partner node sent invalid response to open channel request\n")
return nil, fmt.Errorf("partner node sent invalid response to open channel request")
}
timestamp_end := timestamppb.Now()
runtime_recording := &asrpc.RuntimeRecording{
TimestampStart: timestamp_start,
TimestampEnd: timestamp_end,
}
return &asrpc.OpenChannelResponse{
AppId: appID,
RuntimeRecording: runtime_recording,
}, nil
}
func (r *rpcServer) Pay(ctx context.Context, in *asrpc.PayRequest) (*asrpc.PayResponse, error) {
timestamp_start := timestamppb.Now()
// 1. get on chain state
onchain_state, ok := r.server.payment_channels_onchain_states[in.AlgoAddress]
if !ok {
fmt.Printf("Error: payment channel with partner node %v does not exist\n", in.AlgoAddress)
return nil, fmt.Errorf("payment channel with partner node %v does not exist", in.AlgoAddress)
}
// 2. retrieve old balances
payment_log, ok := r.server.payment_channels_offchain_states_log[in.AlgoAddress]
if !ok {
fmt.Printf("Error: payment channel with partner node %v does not exist\n", in.AlgoAddress)
return nil, fmt.Errorf("payment channel with partner node %v does not exist", in.AlgoAddress)
}
latestOffChainState, err := getLatestOffChainState(payment_log)
if err != nil {
fmt.Printf("Error: %v\n", err)
return nil, err
}
var me_alice bool
var my_balance uint64
var counterparty_balance uint64
if onchain_state.alice_address == r.server.algo_account.Address.String() {
me_alice = true
my_balance = latestOffChainState.alice_balance
counterparty_balance = latestOffChainState.bob_balance
} else {
me_alice = false
my_balance = latestOffChainState.bob_balance
counterparty_balance = latestOffChainState.alice_balance
}
// 3. calculate new balances and timestamp
new_my_balance := my_balance - in.Amount
new_counterparty_balance := counterparty_balance + in.Amount
timestamp_now := time.Now().UnixNano()
// fmt.Printf("New timestamp: %v\n", timestamp_now)
// fmt.Printf("Latest timestamp: %v\n", latestOffChainState.timestamp)
var new_alice_balance uint64
var new_bob_balance uint64
if me_alice {
new_alice_balance = new_my_balance
new_bob_balance = new_counterparty_balance
} else {
new_alice_balance = new_counterparty_balance
new_bob_balance = new_my_balance
}
// 4. sign new state
var my_signature []byte
my_signature, err = payment.SignState(
onchain_state.app_id,
r.server.algo_account,
new_alice_balance,
new_bob_balance,
4161,
timestamp_now)
if err != nil {
fmt.Printf("Error signing state: %v\n", err)
}
// 5. send new state to partner node
newAliceBalanceBytes := make([]byte, 8)
newBobBalanceBytes := make([]byte, 8)
binary.BigEndian.PutUint64(newAliceBalanceBytes, new_alice_balance)
binary.BigEndian.PutUint64(newBobBalanceBytes, new_bob_balance)
timestampBytes := make([]byte, 8)
binary.BigEndian.PutUint64(timestampBytes, uint64(timestamp_now))
server_response, err := sendRequest(onchain_state.partner_ip, P2PRequest{Command: "pay_request", Args: [][]byte{
[]byte(r.server.algo_account.Address.String()), // 1. my address
newAliceBalanceBytes, // 2. my new balance
newBobBalanceBytes, // 3. partner's new balance
timestampBytes, // 4. timestamp
my_signature, // 5. my signature
}})
if err != nil {
fmt.Printf("Error sending pay request to partner node: %v\n", err)
return nil, err
}
// 6. read partner node's response
fmt.Printf("Payment partner node's response: %v\n", server_response.Message)
if server_response.Message != "approve" {
fmt.Printf("Partner node rejected pay request\n")
return nil, fmt.Errorf("partner node rejected pay request")
}
// 7. verify partner node's signature
partner_signature := server_response.Data[0]
partner_verified := payment.VerifyState(
onchain_state.app_id,
new_alice_balance,
new_bob_balance,
4161,
partner_signature,
in.AlgoAddress,
timestamp_now)
if !partner_verified {
fmt.Printf("Partner node's signature is invalid\n")
return nil, fmt.Errorf("partner node's signature is invalid")
}
// 8. save new state
off_chain_state := &paymentChannelOffChainState{
timestamp: timestamp_now,
alice_balance: new_alice_balance,
bob_balance: new_bob_balance,
alice_signature: my_signature,
bob_signature: partner_signature,
algorand_port: 4161,
app_id: onchain_state.app_id,
}
if r.server.payment_channels_offchain_states_log[in.AlgoAddress] == nil {
r.server.payment_channels_offchain_states_log[in.AlgoAddress] = make(map[int64]paymentChannelOffChainState)
}
r.server.payment_channels_offchain_states_log[in.AlgoAddress][timestamp_now] = *off_chain_state
// 9. update on chain state
fmt.Printf("Processed payment of %v microalgos\n", in.Amount)
fmt.Printf("Alice new balance: %v\n", r.server.payment_channels_offchain_states_log[in.AlgoAddress][timestamp_now].alice_balance)
fmt.Printf("Bob new balance: %v\n\n", r.server.payment_channels_offchain_states_log[in.AlgoAddress][timestamp_now].bob_balance)
timestamp_end := timestamppb.Now()
runtime_recording := &asrpc.RuntimeRecording{
TimestampStart: timestamp_start,
TimestampEnd: timestamp_end,
}
return &asrpc.PayResponse{
RuntimeRecording: runtime_recording,
}, nil
}
func (r *rpcServer) InitiateCloseChannel(ctx context.Context, in *asrpc.InitiateCloseChannelRequest) (*asrpc.InitiateCloseChannelResponse, error) {
timestamp_start := timestamppb.Now()
// 1. get on chain state
onchain_state, ok := r.server.payment_channels_onchain_states[in.AlgoAddress]
if !ok {
fmt.Printf("Error: payment channel with partner node %v does not exist\n", in.AlgoAddress)
return nil, fmt.Errorf("payment channel with partner node %v does not exist", in.AlgoAddress)
}
// 2. retrieve latest off chain state
payment_log, ok := r.server.payment_channels_offchain_states_log[in.AlgoAddress]
if !ok {
fmt.Printf("Error: payment channel with partner node %v does not exist\n", in.AlgoAddress)
return nil, fmt.Errorf("payment channel with partner node %v does not exist", in.AlgoAddress)
}
latestOffChainState, err := getLatestOffChainState(payment_log)
if err != nil {
fmt.Printf("Error: %v\n", err)
return nil, err
}
// check if alice or bob have not enough balance to close channel
if latestOffChainState.alice_balance < 1000 || latestOffChainState.bob_balance < 1000 {
fmt.Printf("Error: not enough balance to close channel\n\n")
return nil, fmt.Errorf("not enough balance to close channel")
}
payment.InitiateCloseChannel(
r.server.algod_client,
r.server.algo_account,
4161,
onchain_state.app_id,
latestOffChainState.alice_balance,
latestOffChainState.bob_balance,
uint64(latestOffChainState.timestamp),
latestOffChainState.alice_signature,
latestOffChainState.bob_signature)
fmt.Printf("Initiated channel closure for app_id: %v\n\n", onchain_state.app_id)
timestamp_end := timestamppb.Now()
runtime_recording := &asrpc.RuntimeRecording{
TimestampStart: timestamp_start,
TimestampEnd: timestamp_end,
}
return &asrpc.InitiateCloseChannelResponse{
RuntimeRecording: runtime_recording,
}, nil
}
func (r *rpcServer) FinalizeCloseChannel(ctx context.Context, in *asrpc.FinalizeCloseChannelRequest) (*asrpc.FinalizeCloseChannelResponse, error) {
timestamp_start := timestamppb.Now()
// 1. get on chain state
onchain_state, ok := r.server.payment_channels_onchain_states[in.AlgoAddress]
if !ok {
fmt.Printf("Error: payment channel with partner node %v does not exist\n", in.AlgoAddress)
return nil, fmt.Errorf("payment channel with partner node %v does not exist", in.AlgoAddress)
}
var counterparty_address string
if r.server.algo_account.Address.String() == onchain_state.alice_address {
counterparty_address = onchain_state.bob_address
} else {
counterparty_address = onchain_state.alice_address
}
// 2. call finalize close channel
payment.FinalizeCloseChannel(
r.server.algod_client,
r.server.algo_account,
counterparty_address,
onchain_state.app_id)
fmt.Printf("Finalized channel closure for app_id: %v\n\n", onchain_state.app_id)
// 3. delete on chain state
delete(r.server.payment_channels_onchain_states, in.AlgoAddress)
timestamp_end := timestamppb.Now()
runtime_recording := &asrpc.RuntimeRecording{
TimestampStart: timestamp_start,
TimestampEnd: timestamp_end,
}
return &asrpc.FinalizeCloseChannelResponse{
RuntimeRecording: runtime_recording,
}, nil
}
func (r *rpcServer) CooperativeCloseChannel(ctx context.Context, in *asrpc.CooperativeCloseChannelRequest) (*asrpc.CooperativeCloseChannelResponse, error) {
timestamp_start := timestamppb.Now()
// 1. get on chain state
onchain_state, ok := r.server.payment_channels_onchain_states[in.AlgoAddress]
if !ok {
fmt.Printf("Error: payment channel with partner node %v does not exist\n", in.AlgoAddress)
return nil, fmt.Errorf("payment channel with partner node %v does not exist", in.AlgoAddress)
}
// 2. retrieve latest off chain state
payment_log, ok := r.server.payment_channels_offchain_states_log[in.AlgoAddress]
if !ok {
fmt.Printf("Error: payment channel with partner node %v does not exist\n", in.AlgoAddress)
return nil, fmt.Errorf("payment channel with partner node %v does not exist", in.AlgoAddress)
}
latestOffChainState, err := getLatestOffChainState(payment_log)
if err != nil {
fmt.Printf("Error: %v\n", err)
return nil, err
}
// 3. check if alice or bob have not enough balance to close channel
if latestOffChainState.alice_balance < 1000 || latestOffChainState.bob_balance < 1000 {
fmt.Printf("Error: not enough balance to close channel\n\n")
return nil, fmt.Errorf("not enough balance to close channel")
}
// 4. sign cooperative close state
var my_signature []byte
my_signature, err = payment.SignClose(
onchain_state.app_id,
r.server.algo_account,
latestOffChainState.alice_balance,
latestOffChainState.bob_balance,
4161,
latestOffChainState.timestamp,
)
if err != nil {
fmt.Printf("Error signing state: %v\n", err)
}
// 5. send cooperative close request to partner node
server_response, err := sendRequest(onchain_state.partner_ip, P2PRequest{Command: "close_channel_request", Args: [][]byte{
[]byte(r.server.algo_account.Address.String()), // 1. my address
my_signature, // 2. my signature
}})
if err != nil {
fmt.Printf("Error sending pay request to partner node: %v\n", err)
return nil, err
}
// 6. read partner node's response
fmt.Printf("Payment partner node's response: %v\n", server_response.Message)
if server_response.Message != "approve" {
fmt.Printf("Partner node rejected pay request\n")
return nil, fmt.Errorf("partner node rejected pay request")
}
// 7. verify partner node's signature
partner_signature := server_response.Data[0]
partner_verified := payment.VerifyClose(
onchain_state.app_id,
latestOffChainState.alice_balance,
latestOffChainState.bob_balance,
4161,
partner_signature,
in.AlgoAddress,
latestOffChainState.timestamp,
)
if !partner_verified {
fmt.Printf("Error: partner node's signature is not valid\n")
return nil, fmt.Errorf("partner node's signature is not valid")
}
var is_alice bool
if onchain_state.alice_address == r.server.algo_account.Address.String() {
is_alice = true
} else {
is_alice = false
}
var alice_signature []byte
var bob_signature []byte
if is_alice {
alice_signature = my_signature
bob_signature = partner_signature
} else {
alice_signature = partner_signature
bob_signature = my_signature
}
// 8. call cooperative close channel
payment.CooperativeCloseChannel(
r.server.algod_client,
r.server.algo_account,
in.AlgoAddress,
4161,
onchain_state.app_id,
latestOffChainState.alice_balance,
latestOffChainState.bob_balance,
uint64(latestOffChainState.timestamp),
alice_signature,
bob_signature)
fmt.Printf("Cooperative channel closure for app_id: %v\n\n", onchain_state.app_id)
// 9. delete payment channel from on chain state
delete(r.server.payment_channels_onchain_states, in.AlgoAddress)
timestamp_end := timestamppb.Now()
runtime_recording := &asrpc.RuntimeRecording{
TimestampStart: timestamp_start,
TimestampEnd: timestamp_end,
}
return &asrpc.CooperativeCloseChannelResponse{
RuntimeRecording: runtime_recording,
}, nil
}
func (r *rpcServer) TryToCheat(ctx context.Context, in *asrpc.TryToCheatRequest) (*asrpc.TryToCheatResponse, error) {
timestamp_start := timestamppb.Now()
// 1. get on chain state
onchain_state, ok := r.server.payment_channels_onchain_states[in.AlgoAddress]
if !ok {
fmt.Printf("Error: payment channel with partner node %v does not exist\n", in.AlgoAddress)
return nil, fmt.Errorf("payment channel with partner node %v does not exist", in.AlgoAddress)
}
// 2. retrieve off chain state with highest balance
payment_log, ok := r.server.payment_channels_offchain_states_log[in.AlgoAddress]
if !ok {
fmt.Printf("Error: payment channel with partner node %v does not exist\n", in.AlgoAddress)
return nil, fmt.Errorf("payment channel with partner node %v does not exist", in.AlgoAddress)
}
var is_alice bool
if onchain_state.alice_address == r.server.algo_account.Address.String() {
is_alice = true
} else {
is_alice = false
}
highesBalanceOffChainState, err := getHighestBalanceOffChainState(is_alice, payment_log)
if err != nil {
fmt.Printf("Error: %v\n", err)
return nil, err
}
// 3. check if alice or bob have not enough balance to close channel
if highesBalanceOffChainState.alice_balance < 1000 || highesBalanceOffChainState.bob_balance < 1000 {
fmt.Printf("Error: not enough balance to close channel\n\n")
return nil, fmt.Errorf("not enough balance to close channel")
}
// 4. intiate close channel
payment.InitiateCloseChannel(
r.server.algod_client,
r.server.algo_account,
4161,
onchain_state.app_id,
highesBalanceOffChainState.alice_balance,
highesBalanceOffChainState.bob_balance,
uint64(highesBalanceOffChainState.timestamp),
highesBalanceOffChainState.alice_signature,
highesBalanceOffChainState.bob_signature)
fmt.Printf("Try to cheat for app_id: %v\n", onchain_state.app_id)
fmt.Printf("Alice cheating balance: %v\n", highesBalanceOffChainState.alice_balance)
fmt.Printf("Bob cheating balance: %v\n\n", highesBalanceOffChainState.bob_balance)
timestamp_end := timestamppb.Now()
runtime_recording := &asrpc.RuntimeRecording{
TimestampStart: timestamp_start,
TimestampEnd: timestamp_end,
}
return &asrpc.TryToCheatResponse{
RuntimeRecording: runtime_recording,
}, nil
}