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vmQueryGetter.go
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vmQueryGetter.go
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package blockchain
import (
"context"
"fmt"
"math/big"
"strconv"
"github.com/multiversx/mx-chain-core-go/core"
"github.com/multiversx/mx-chain-core-go/core/check"
logger "github.com/multiversx/mx-chain-logger-go"
"github.com/multiversx/mx-sdk-go/builders"
"github.com/multiversx/mx-sdk-go/data"
)
const (
okCodeAfterExecution = "ok"
internalError = "internal error"
)
// ArgsVmQueryGetter is the arguments DTO used in the NewvmQueryGetter constructor
type ArgsVmQueryGetter struct {
Proxy Proxy
Log logger.Logger
}
type vmQueryGetter struct {
proxy Proxy
log logger.Logger
}
// NewVmQueryGetter creates a new instance of the vmQueryGetter type
func NewVmQueryGetter(args ArgsVmQueryGetter) (*vmQueryGetter, error) {
if check.IfNil(args.Proxy) {
return nil, ErrNilProxy
}
if check.IfNil(args.Log) {
return nil, core.ErrNilLogger
}
return &vmQueryGetter{
proxy: args.Proxy,
log: args.Log,
}, nil
}
// ExecuteQueryReturningBytes will try to execute the provided query and return the result as slice of byte slices
func (dataGetter *vmQueryGetter) ExecuteQueryReturningBytes(ctx context.Context, request *data.VmValueRequest) ([][]byte, error) {
if request == nil {
return nil, ErrNilRequest
}
response, err := dataGetter.proxy.ExecuteVMQuery(ctx, request)
if err != nil {
return nil, err
}
dataGetter.log.Debug("executed VMQuery", "FuncName", request.FuncName,
"Args", request.Args, "SC address", request.Address, "Caller", request.CallerAddr,
"response.ReturnCode", response.Data.ReturnCode,
"response.ReturnData", fmt.Sprintf("%+v", response.Data.ReturnData))
if response.Data.ReturnCode != okCodeAfterExecution {
return nil, NewQueryResponseError(
response.Data.ReturnCode,
response.Data.ReturnMessage,
request.FuncName,
request.Address,
request.Args...,
)
}
return response.Data.ReturnData, nil
}
// ExecuteQueryReturningBool will try to execute the provided query and return the result as bool
func (dataGetter *vmQueryGetter) ExecuteQueryReturningBool(ctx context.Context, request *data.VmValueRequest) (bool, error) {
response, err := dataGetter.ExecuteQueryReturningBytes(ctx, request)
if err != nil {
return false, err
}
if len(response) == 0 {
return false, nil
}
return dataGetter.parseBool(response[0], request.FuncName, request.Address, request.Args...)
}
func (dataGetter *vmQueryGetter) parseBool(buff []byte, funcName string, address string, args ...string) (bool, error) {
if len(buff) == 0 {
return false, nil
}
result, err := strconv.ParseBool(fmt.Sprintf("%d", buff[0]))
if err != nil {
return false, NewQueryResponseError(
internalError,
fmt.Sprintf("error converting the received bytes to bool, %s", err.Error()),
funcName,
address,
args...,
)
}
return result, nil
}
// ExecuteQueryReturningUint64 will try to execute the provided query and return the result as uint64
func (dataGetter *vmQueryGetter) ExecuteQueryReturningUint64(ctx context.Context, request *data.VmValueRequest) (uint64, error) {
response, err := dataGetter.ExecuteQueryReturningBytes(ctx, request)
if err != nil {
return 0, err
}
if len(response) == 0 {
return 0, nil
}
if len(response[0]) == 0 {
return 0, nil
}
num, err := parseUInt64FromByteSlice(response[0])
if err != nil {
return 0, NewQueryResponseError(
internalError,
err.Error(),
request.FuncName,
request.Address,
request.Args...,
)
}
return num, nil
}
func parseUInt64FromByteSlice(bytes []byte) (uint64, error) {
num := big.NewInt(0).SetBytes(bytes)
if !num.IsUint64() {
return 0, ErrNotUint64Bytes
}
return num.Uint64(), nil
}
// ExecuteQueryFromBuilder will try to execute the provided query and return the result as slice of byte slices
func (dataGetter *vmQueryGetter) ExecuteQueryFromBuilder(ctx context.Context, builder builders.VMQueryBuilder) ([][]byte, error) {
vmValuesRequest, err := builder.ToVmValueRequest()
if err != nil {
return nil, err
}
return dataGetter.ExecuteQueryReturningBytes(ctx, vmValuesRequest)
}
// ExecuteQueryUint64FromBuilder will try to execute the provided query and return the result as uint64
func (dataGetter *vmQueryGetter) ExecuteQueryUint64FromBuilder(ctx context.Context, builder builders.VMQueryBuilder) (uint64, error) {
vmValuesRequest, err := builder.ToVmValueRequest()
if err != nil {
return 0, err
}
return dataGetter.ExecuteQueryReturningUint64(ctx, vmValuesRequest)
}
// ExecuteQueryBoolFromBuilder will try to execute the provided query and return the result as bool
func (dataGetter *vmQueryGetter) ExecuteQueryBoolFromBuilder(ctx context.Context, builder builders.VMQueryBuilder) (bool, error) {
vmValuesRequest, err := builder.ToVmValueRequest()
if err != nil {
return false, err
}
return dataGetter.ExecuteQueryReturningBool(ctx, vmValuesRequest)
}
// IsInterfaceNil returns true if there is no value under the interface
func (dataGetter *vmQueryGetter) IsInterfaceNil() bool {
return dataGetter == nil
}