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keeper.go
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keeper.go
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package keeper
import (
"context"
"fmt"
"github.com/cosmos/cosmos-sdk/codec"
paramtypes "github.com/cosmos/cosmos-sdk/x/params/types"
authtypes "github.com/datachainlab/cross/x/core/auth/types"
txtypes "github.com/datachainlab/cross/x/core/tx/types"
"github.com/datachainlab/fabric-besu-cross-demo/contracts/erc20/erc20mgr/types"
"github.com/pkg/errors"
"strconv"
sdk "github.com/cosmos/cosmos-sdk/types"
erc20keeper "github.com/datachainlab/cross-cdt/modules/erc20/keeper"
)
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 := types.IDFromAccount(signers[0].Id)
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 types.ID, req types.ContractCallRequest) (*txtypes.ContractCallResult, error) {
admin, err := k.getAdmin(ctx)
if err != nil {
return nil, err
}
if id != admin {
return nil, errors.Errorf("failed to authorize. id: %s", id)
}
if len(req.Args) != 2 {
return nil, errors.New("invalid argument")
}
account := types.ID(req.Args[0])
amount, err := strconv.ParseInt(req.Args[1], 10, 64)
if err != nil {
return nil, err
}
err = k.erc20Keeper.Mint(ctx, string(account), 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 types.ID, req types.ContractCallRequest) (*txtypes.ContractCallResult, error) {
admin, err := k.getAdmin(ctx)
if err != nil {
return nil, err
}
if id != admin {
return nil, errors.Errorf("failed to authorize. id: %s", id)
}
if len(req.Args) != 2 {
return nil, errors.New("invalid argument")
}
account := types.ID(req.Args[0])
amount, err := strconv.ParseInt(req.Args[1], 10, 64)
if err != nil {
return nil, err
}
err = k.erc20Keeper.Burn(ctx, string(account), 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 types.ID, req types.ContractCallRequest) (*txtypes.ContractCallResult, error) {
if len(req.Args) != 2 {
return nil, errors.New("invalid argument")
}
recipient := types.ID(req.Args[0])
amount, err := strconv.ParseInt(req.Args[1], 10, 64)
if err != nil {
return nil, err
}
err = k.erc20Keeper.Transfer(ctx, string(sender), string(recipient), 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 types.ID, req types.ContractCallRequest) (*txtypes.ContractCallResult, error) {
if len(req.Args) != 2 {
return nil, errors.New("invalid argument")
}
spender := types.ID(req.Args[0])
// TODO: Check amount <= balance
amount, err := strconv.ParseInt(req.Args[1], 10, 64)
if err != nil {
return nil, err
}
err = k.erc20Keeper.Approve(ctx, string(owner), string(spender), 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 types.ID, req types.ContractCallRequest) (*txtypes.ContractCallResult, error) {
if len(req.Args) != 3 {
return nil, errors.New("invalid argument")
}
owner := types.ID(req.Args[0])
recipient := types.ID(req.Args[1])
amount, err := strconv.ParseInt(req.Args[2], 10, 64)
if err != nil {
return nil, err
}
err = k.erc20Keeper.TransferFrom(ctx, string(owner), string(spender), string(recipient), 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 types.ID) 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, string(admin))
k.paramSpace.Set(ctx, types.KeyIsSetAdmin, true)
return nil
}
func (k Keeper) getAdmin(ctx sdk.Context) (types.ID, error) {
var admin string
k.paramSpace.GetIfExists(ctx, types.KeyAdmin, &admin)
if admin == "" {
return "", errors.New("failed to get admin")
}
return types.ID(admin), nil
}