🔀 Merge pull request #83 from perun-network/82-virtual-channels

Virtual channel watching and dispute test (Last part of large Virtual Channel PR)

backend/ethereum/channel/backend.go

@@ -49,6 +49,7 @@ var (
 	abiParams     abi.Type
 	abiState      abi.Type
 	abiProgress   abi.Method
+	abiRegister   abi.Method
 )
 
 func init() {
@@ -74,6 +75,10 @@ func init() {
 	if abiProgress, ok = adj.Methods["progress"]; !ok {
 		panic("Could not find method progress in adjudicator contract.")
 	}
+
+	if abiRegister, ok = adj.Methods["register"]; !ok {
+		panic("Could not find method register in adjudicator contract.")
+	}
 }
 
 // Backend implements the interface defined in channel/Backend.go.

backend/ethereum/channel/subscription.go

@@ -21,6 +21,7 @@ import (
 	"sync"
 
 	"github.com/ethereum/go-ethereum"
+	"github.com/ethereum/go-ethereum/accounts/abi"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/pkg/errors"
 
@@ -104,6 +105,7 @@ evloop:
 
 func (r *RegisteredSub) processNext(ctx context.Context, a *Adjudicator, _next *subscription.Event) (err error) {
 	next, ok := _next.Data.(*adjudicator.AdjudicatorChannelUpdate)
+	next.Raw = _next.Log
 	if !ok {
 		log.Panicf("unexpected event type: %T", _next.Data)
 	}
@@ -115,7 +117,7 @@ func (r *RegisteredSub) processNext(ctx context.Context, a *Adjudicator, _next *
 		// if newer version or same version and newer timeout, replace
 		if current.Version() < next.Version || current.Version() == next.Version && currentTimeout.Time < next.Timeout {
 			var e channel.AdjudicatorEvent
-			e, err = a.convertEvent(ctx, next, _next.Log.TxHash)
+			e, err = a.convertEvent(ctx, next)
 			if err != nil {
 				return
 			}
@@ -126,7 +128,7 @@ func (r *RegisteredSub) processNext(ctx context.Context, a *Adjudicator, _next *
 		}
 	default: // next-channel is empty
 		var e channel.AdjudicatorEvent
-		e, err = a.convertEvent(ctx, next, _next.Log.TxHash)
+		e, err = a.convertEvent(ctx, next)
 		if err != nil {
 			return
 		}
@@ -161,14 +163,40 @@ func (r *RegisteredSub) Err() error {
 	return <-r.err
 }
 
-func (a *Adjudicator) convertEvent(ctx context.Context, e *adjudicator.AdjudicatorChannelUpdate, txHash common.Hash) (channel.AdjudicatorEvent, error) {
+func (a *Adjudicator) convertEvent(ctx context.Context, e *adjudicator.AdjudicatorChannelUpdate) (channel.AdjudicatorEvent, error) {
 	base := channel.NewAdjudicatorEventBase(e.ChannelID, NewBlockTimeout(a.ContractInterface, e.Timeout), e.Version)
 	switch e.Phase {
 	case phaseDispute:
-		return &channel.RegisteredEvent{AdjudicatorEventBase: *base}, nil
+		args, err := a.fetchRegisterCallData(ctx, e.Raw.TxHash)
+		if err != nil {
+			return nil, errors.WithMessage(err, "fetching call data")
+		}
+
+		ch, ok := args.get(e.ChannelID)
+		if !ok {
+			return nil, errors.Errorf("channel not found in calldata: %v", e.ChannelID)
+		}
+
+		var app channel.App
+		var zeroAddress common.Address
+		if ch.Params.App == zeroAddress {
+			app = channel.NoApp()
+		} else {
+			app, err = channel.Resolve(wallet.AsWalletAddr(ch.Params.App))
+			if err != nil {
+				return nil, err
+			}
+		}
+		state := FromEthState(app, &ch.State)
+
+		return &channel.RegisteredEvent{
+			AdjudicatorEventBase: *base,
+			State:                &state,
+			Sigs:                 ch.Sigs,
+		}, nil
 
 	case phaseForceExec:
-		args, err := a.fetchProgressCallData(ctx, txHash)
+		args, err := a.fetchProgressCallData(ctx, e.Raw.TxHash)
 		if err != nil {
 			return nil, errors.WithMessage(err, "fetching call data")
 		}
@@ -200,24 +228,53 @@ type progressCallData struct {
 }
 
 func (a *Adjudicator) fetchProgressCallData(ctx context.Context, txHash common.Hash) (*progressCallData, error) {
+	var args progressCallData
+	err := a.fetchCallData(ctx, txHash, abiProgress, &args)
+	return &args, errors.WithMessage(err, "fetching call data")
+}
+
+type registerCallData struct {
+	Channel     adjudicator.AdjudicatorSignedState
+	SubChannels []adjudicator.AdjudicatorSignedState
+}
+
+func (args *registerCallData) get(id channel.ID) (*adjudicator.AdjudicatorSignedState, bool) {
+	ch := &args.Channel
+	if ch.State.ChannelID == id {
+		return ch, true
+	}
+	for _, ch := range args.SubChannels {
+		if ch.State.ChannelID == id {
+			return &ch, true
+		}
+	}
+	return nil, false
+}
+
+func (a *Adjudicator) fetchRegisterCallData(ctx context.Context, txHash common.Hash) (*registerCallData, error) {
+	var args registerCallData
+	err := a.fetchCallData(ctx, txHash, abiRegister, &args)
+	return &args, errors.WithMessage(err, "fetching call data")
+}
+
+func (a *Adjudicator) fetchCallData(ctx context.Context, txHash common.Hash, method abi.Method, args interface{}) error {
 	tx, _, err := a.ContractBackend.TransactionByHash(ctx, txHash)
 	if err != nil {
 		err = cherrors.CheckIsChainNotReachableError(err)
-		return nil, errors.WithMessage(err, "getting transaction")
+		return errors.WithMessage(err, "getting transaction")
 	}
 
-	argsData := tx.Data()[len(abiProgress.ID):]
+	argsData := tx.Data()[len(method.ID):]
 
-	argsI, err := abiProgress.Inputs.UnpackValues(argsData)
+	argsI, err := method.Inputs.UnpackValues(argsData)
 	if err != nil {
-		return nil, errors.WithMessage(err, "unpacking")
+		return errors.WithMessage(err, "unpacking")
 	}
 
-	var args progressCallData
-	err = abiProgress.Inputs.Copy(&args, argsI)
+	err = method.Inputs.Copy(args, argsI)
 	if err != nil {
-		return nil, errors.WithMessage(err, "copying into struct")
+		return errors.WithMessage(err, "copying into struct")
 	}
 
-	return &args, nil
+	return nil
 }

channel/adjudicator.go

@@ -144,6 +144,8 @@ type (
 	// registration on the blockchain.
 	RegisteredEvent struct {
 		AdjudicatorEventBase // Channel ID and Refutation phase timeout
+		State                *State
+		Sigs                 []wallet.Sig
 	}
 
 	// ConcludedEvent signals channel conclusion.
@@ -191,13 +193,15 @@ func (b AdjudicatorEventBase) Timeout() Timeout { return b.TimeoutV }
 func (b AdjudicatorEventBase) Version() uint64 { return b.VersionV }
 
 // NewRegisteredEvent creates a new RegisteredEvent.
-func NewRegisteredEvent(id ID, timeout Timeout, version uint64) *RegisteredEvent {
+func NewRegisteredEvent(id ID, timeout Timeout, version uint64, state *State, sigs []wallet.Sig) *RegisteredEvent {
 	return &RegisteredEvent{
 		AdjudicatorEventBase: AdjudicatorEventBase{
 			IDV:      id,
 			TimeoutV: timeout,
 			VersionV: version,
 		},
+		State: state,
+		Sigs:  sigs,
 	}
 }
 
@@ -214,6 +218,17 @@ func NewProgressedEvent(id ID, timeout Timeout, state *State, idx Index) *Progre
 	}
 }
 
+// NewConcludedEvent creates a new ConcludedEvent.
+func NewConcludedEvent(id ID, timeout Timeout, version uint64) *ConcludedEvent {
+	return &ConcludedEvent{
+		AdjudicatorEventBase: AdjudicatorEventBase{
+			IDV:      id,
+			TimeoutV: timeout,
+			VersionV: version,
+		},
+	}
+}
+
 // ElapsedTimeout is a Timeout that is always elapsed.
 type ElapsedTimeout struct{}