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handler.go
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handler.go
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package ethbridge
import (
"fmt"
"github.com/cosmos/cosmos-sdk/codec"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/x/bank"
"github.com/cosmos/peggy/x/ethbridge/types"
"github.com/cosmos/peggy/x/oracle"
)
// NewHandler returns a handler for "ethbridge" type messages.
func NewHandler(oracleKeeper oracle.Keeper, bankKeeper bank.Keeper, cdc *codec.Codec, codespace sdk.CodespaceType) sdk.Handler {
return func(ctx sdk.Context, msg sdk.Msg) sdk.Result {
switch msg := msg.(type) {
case MsgCreateEthBridgeClaim:
return handleMsgCreateEthBridgeClaim(ctx, cdc, oracleKeeper, bankKeeper, msg, codespace)
default:
errMsg := fmt.Sprintf("unrecognized ethbridge message type: %v", msg.Type())
return sdk.ErrUnknownRequest(errMsg).Result()
}
}
}
// Handle a message to create a bridge claim
func handleMsgCreateEthBridgeClaim(ctx sdk.Context, cdc *codec.Codec, oracleKeeper oracle.Keeper, bankKeeper bank.Keeper, msg MsgCreateEthBridgeClaim, codespace sdk.CodespaceType) sdk.Result {
oracleClaim, err := types.CreateOracleClaimFromEthClaim(cdc, types.EthBridgeClaim(msg))
if err != nil {
return types.ErrJSONMarshalling(codespace).Result()
}
status, sdkErr := oracleKeeper.ProcessClaim(ctx, oracleClaim)
if sdkErr != nil {
return sdkErr.Result()
}
if status.Text == oracle.SuccessStatus {
sdkErr = processSuccessfulClaim(ctx, bankKeeper, status.FinalClaim)
if sdkErr != nil {
return sdkErr.Result()
}
}
return sdk.Result{Log: status.Text.String()}
}
func processSuccessfulClaim(ctx sdk.Context, bankKeeper bank.Keeper, claim string) sdk.Error {
oracleClaim, err := types.CreateOracleClaimFromOracleString(claim)
if err != nil {
return err
}
receiverAddress := oracleClaim.CosmosReceiver
_, _, err = bankKeeper.AddCoins(ctx, receiverAddress, oracleClaim.Amount)
if err != nil {
return err
}
return nil
}