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keeper.go
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/
keeper.go
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package keeper
import (
"context"
"fmt"
"strconv"
"github.com/cosmos/cosmos-sdk/codec"
sdk "github.com/cosmos/cosmos-sdk/types"
paramtypes "github.com/cosmos/cosmos-sdk/x/params/types"
erc20keeper "github.com/datachainlab/cross-cdt/modules/erc20/keeper"
authtypes "github.com/datachainlab/cross/x/core/auth/types"
txtypes "github.com/datachainlab/cross/x/core/tx/types"
"github.com/pkg/errors"
"github.com/datachainlab/fabric-tendermint-cross-demo/contracts/erc20/modules/erc20mgr/types"
)
type Keeper struct {
m codec.Codec
erc20Keeper erc20keeper.Keeper
paramSpace paramtypes.Subspace
}
// NewKeeper creates a new keeper instance
func NewKeeper(m codec.Codec, erc20Keeper erc20keeper.Keeper, paramSpace paramtypes.Subspace) Keeper {
paramSpace = paramSpace.WithKeyTable(types.ParamKeyTable())
return Keeper{m: m, erc20Keeper: erc20Keeper, paramSpace: paramSpace}
}
// HandleContractCall is called by ContractModule
func (k Keeper) HandleContractCall(goCtx context.Context, signers []authtypes.Account, callInfo txtypes.ContractCallInfo) (*txtypes.ContractCallResult, error) {
var req types.ContractCallRequest
if err := k.m.UnmarshalJSON(callInfo, &req); err != nil {
return nil, err
}
ctx := sdk.UnwrapSDKContext(goCtx)
if len(signers) == 0 {
return nil, fmt.Errorf("can't get signer")
}
id := signers[0].Id.AccAddress()
switch req.Method {
case "mint":
return k.handleMint(ctx, id, req)
case "burn":
return k.handleBurn(ctx, id, req)
case "transfer":
return k.handleTransfer(ctx, id, req)
case "approve":
return k.handleApprove(ctx, id, req)
case "transferFrom":
return k.HandleTransferFrom(ctx, id, req)
default:
panic(fmt.Sprintf("unknown method '%v'", req.Method))
}
}
func (k Keeper) handleMint(ctx sdk.Context, id sdk.AccAddress, req types.ContractCallRequest) (*txtypes.ContractCallResult, error) {
admin, err := k.getAdmin(ctx)
if err != nil {
return nil, err
}
if !id.Equals(admin) {
return nil, errors.Errorf("failed to authorize. id: %s, admin id: %s", id.String(), admin.String())
}
if len(req.Args) != 2 {
return nil, errors.New("invalid argument")
}
account, err := sdk.AccAddressFromBech32(req.Args[0])
if err != nil {
return nil, err
}
amount, err := getAmount(req.Args[1])
if err != nil {
return nil, err
}
err = k.erc20Keeper.Mint(ctx, account.String(), amount)
if err != nil {
return nil, err
}
// TODO: set return values
return &txtypes.ContractCallResult{Data: []byte("")}, nil
}
func (k Keeper) handleBurn(ctx sdk.Context, id sdk.AccAddress, req types.ContractCallRequest) (*txtypes.ContractCallResult, error) {
admin, err := k.getAdmin(ctx)
if err != nil {
return nil, err
}
if !id.Equals(admin) {
return nil, errors.Errorf("failed to authorize. id: %s", id)
}
if len(req.Args) != 2 {
return nil, errors.New("invalid argument")
}
account, err := sdk.AccAddressFromBech32(req.Args[0])
if err != nil {
return nil, err
}
amount, err := getAmount(req.Args[1])
if err != nil {
return nil, err
}
err = k.erc20Keeper.Burn(ctx, account.String(), amount)
if err != nil {
return nil, err
}
// TODO: set return values
return &txtypes.ContractCallResult{Data: []byte("")}, nil
}
func (k Keeper) handleTransfer(ctx sdk.Context, sender sdk.AccAddress, req types.ContractCallRequest) (*txtypes.ContractCallResult, error) {
if len(req.Args) != 2 {
return nil, errors.New("invalid argument")
}
recipient, err := sdk.AccAddressFromBech32(req.Args[0])
if err != nil {
return nil, err
}
amount, err := getAmount(req.Args[1])
if err != nil {
return nil, err
}
return k.Transfer(ctx, sender, recipient, amount)
}
func (k Keeper) Transfer(ctx sdk.Context, sender, recipient sdk.AccAddress, amount int64) (*txtypes.ContractCallResult, error) {
err := k.erc20Keeper.Transfer(ctx, sender.String(), recipient.String(), amount)
if err != nil {
return nil, err
}
// TODO: set return values
return &txtypes.ContractCallResult{Data: []byte("")}, nil
}
func (k Keeper) handleApprove(ctx sdk.Context, owner sdk.AccAddress, req types.ContractCallRequest) (*txtypes.ContractCallResult, error) {
if len(req.Args) != 2 {
return nil, errors.New("invalid argument")
}
spender, err := sdk.AccAddressFromBech32(req.Args[0])
if err != nil {
return nil, err
}
amount, err := getAmount(req.Args[1])
if err != nil {
return nil, err
}
err = k.erc20Keeper.Approve(ctx, owner.String(), spender.String(), amount)
if err != nil {
return nil, err
}
// TODO: set return values
return &txtypes.ContractCallResult{Data: []byte("")}, nil
}
func (k Keeper) HandleTransferFrom(ctx sdk.Context, spender sdk.AccAddress, req types.ContractCallRequest) (*txtypes.ContractCallResult, error) {
if len(req.Args) != 3 {
return nil, errors.New("invalid argument")
}
owner, err := sdk.AccAddressFromBech32(req.Args[0])
if err != nil {
return nil, err
}
recipient, err := sdk.AccAddressFromBech32(req.Args[1])
if err != nil {
return nil, err
}
amount, err := getAmount(req.Args[2])
if err != nil {
return nil, err
}
err = k.erc20Keeper.TransferFrom(ctx, owner.String(), spender.String(), recipient.String(), amount)
if err != nil {
return nil, err
}
// TODO: set return values
return &txtypes.ContractCallResult{Data: []byte("")}, nil
}
func (k Keeper) Codec() codec.Codec {
return k.m
}
func (k Keeper) SetAdmin(ctx sdk.Context, admin sdk.AccAddress) error {
var isSetAdmin bool
k.paramSpace.GetIfExists(ctx, types.KeyIsSetAdmin, &isSetAdmin)
if isSetAdmin {
return errors.New("failed to set admin")
}
k.paramSpace.Set(ctx, types.KeyAdmin, admin.String())
k.paramSpace.Set(ctx, types.KeyIsSetAdmin, true)
return nil
}
func (k Keeper) getAdmin(ctx sdk.Context) (sdk.AccAddress, error) {
var admin string
k.paramSpace.GetIfExists(ctx, types.KeyAdmin, &admin)
if admin == "" {
return sdk.AccAddress{}, errors.New("failed to get admin")
}
acc, err := sdk.AccAddressFromBech32(admin)
if err != nil {
return sdk.AccAddress{}, err
}
return acc, nil
}
func getAmount(target string) (int64, error) {
return strconv.ParseInt(target, 10, 64)
}