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msg_dispatcher.go
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/
msg_dispatcher.go
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package keeper
import (
"encoding/json"
"fmt"
wasmkeeper "github.com/CosmWasm/wasmd/x/wasm/keeper"
wasmtypes "github.com/CosmWasm/wasmd/x/wasm/types"
wasmvmtypes "github.com/CosmWasm/wasmvm/types"
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
"github.com/axelarnetwork/axelar-core/utils"
"github.com/axelarnetwork/axelar-core/x/nexus/exported"
"github.com/axelarnetwork/axelar-core/x/nexus/types"
tss "github.com/axelarnetwork/axelar-core/x/tss/exported"
"github.com/axelarnetwork/utils/funcs"
)
var _ wasmkeeper.Messenger = (*Messenger)(nil)
type Messenger struct {
types.Nexus
}
// NewMessenger returns a new Messenger
func NewMessenger(nexus types.Nexus) Messenger {
return Messenger{nexus}
}
// DispatchMsg decodes the messages from the cosmowasm gateway and routes them to the nexus module if possible
func (m Messenger) DispatchMsg(ctx sdk.Context, contractAddr sdk.AccAddress, _ string, msg wasmvmtypes.CosmosMsg) (events []sdk.Event, data [][]byte, err error) {
req, err := encodeRoutingMessage(contractAddr, msg.Custom)
if err != nil {
return nil, nil, err
}
gateway := m.GetParams(ctx).Gateway
if gateway.Empty() {
return nil, nil, fmt.Errorf("gateway is not set")
}
if !gateway.Equals(contractAddr) {
return nil, nil, fmt.Errorf("contract address %s is not the gateway", contractAddr)
}
if err := m.routeMsg(ctx, req); err != nil {
return nil, nil, err
}
funcs.MustNoErr(ctx.EventManager().EmitTypedEvent(&types.WasmMessageRouted{Message: req}))
return nil, nil, nil
}
func (m Messenger) routeMsg(ctx sdk.Context, msg exported.WasmMessage) error {
destinationChain, ok := m.GetChain(ctx, msg.DestinationChain)
if !ok {
return fmt.Errorf("recipient chain %s is not a registered chain", msg.DestinationChain)
}
id, _, _ := m.GenerateMessageID(ctx)
sourceChain := exported.Chain{Name: msg.SourceChain, SupportsForeignAssets: false, KeyType: tss.None, Module: wasmtypes.ModuleName}
sender := exported.CrossChainAddress{Chain: sourceChain, Address: msg.SourceAddress}
recipient := exported.CrossChainAddress{Chain: destinationChain, Address: msg.DestinationAddress}
nexusMsg := exported.NewGeneralMessage(id, sender, recipient, msg.PayloadHash, msg.SourceTxID, msg.SourceTxIndex, nil)
if err := m.Nexus.SetNewMessage(ctx, nexusMsg); err != nil {
return err
}
// try routing the message
_ = utils.RunCached(ctx, m, func(ctx sdk.Context) (struct{}, error) {
return struct{}{}, m.RouteMessage(ctx, nexusMsg.ID)
})
return nil
}
// EncodeRoutingMessage encodes the message from the wasm contract into a sdk.Msg
func EncodeRoutingMessage(sender sdk.AccAddress, msg json.RawMessage) ([]sdk.Msg, error) {
req, err := encodeRoutingMessage(sender, msg)
if err != nil {
return nil, err
}
return []sdk.Msg{&req}, nil
}
func encodeRoutingMessage(sender sdk.AccAddress, msg json.RawMessage) (exported.WasmMessage, error) {
req := exported.WasmMessage{}
if err := json.Unmarshal(msg, &req); err != nil {
return exported.WasmMessage{}, sdkerrors.Wrap(wasmtypes.ErrUnknownMsg, err.Error())
}
req.Sender = sender
return req, nil
}