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tx_evalution.go
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tx_evalution.go
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// Copyright 2021 Matt Ho
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ogmigo
import (
"context"
"encoding/json"
"errors"
"fmt"
"github.com/buger/jsonparser"
"github.com/thuannguyen2010/ogmigo/ouroboros/chainsync"
)
type EvaluationResponse struct {
Type string
Version string
ServiceName string `json:"servicename"`
MethodName string `json:"methodname"`
Reflection interface{}
Result json.RawMessage
}
// EvaluateTx evaluate the execution units of scripts present in a given transaction, without actually submitting the transaction
// https://ogmios.dev/mini-protocols/local-tx-submission/#evaluatetx
func (c *Client) EvaluateTx(ctx context.Context, cborHex string) (redeemer chainsync.Redeemer, err error) {
var (
payload = makePayload("EvaluateTx", Map{"evaluate": cborHex})
raw json.RawMessage
)
if err := c.query(ctx, payload, &raw); err != nil {
return nil, fmt.Errorf("failed to evaluate tx: %w", err)
}
return readEvaluateTx(raw)
}
func readEvaluateTx(data []byte) (chainsync.Redeemer, error) {
value, dataType, _, err := jsonparser.Get(data, "result", "EvaluationFailure")
if err != nil {
if errors.Is(err, jsonparser.KeyPathNotFoundError) {
redeemerRaw, _, _, err := jsonparser.Get(data, "result", "EvaluationResult")
if err != nil {
return nil, err
}
var v chainsync.Redeemer
err = json.Unmarshal(redeemerRaw, &v)
if err != nil {
return nil, fmt.Errorf("cannot parse result: %v to redeemer: %w", string(value), err)
}
return v, nil
}
return nil, fmt.Errorf("failed to parse EvaluateTx response: %w", err)
}
switch dataType {
case jsonparser.Object:
return nil, EvaluateTxError{message: value}
default:
return nil, fmt.Errorf("EvaluateTx failed: %v", string(value))
}
}
// EvaluateTxV6 evaluate the execution units of scripts present in a given transaction, without actually submitting the transaction
// https://ogmios.dev/mini-protocols/local-tx-submission/#evaluatetx
func (c *Client) EvaluateTxV6(ctx context.Context, cborHex string) (redeemer chainsync.Redeemer, err error) {
var (
payload = makePayloadV6("evaluateTransaction", Map{"transaction": Map{"cbor": cborHex}})
raw json.RawMessage
)
if err := c.query(ctx, payload, &raw); err != nil {
return nil, fmt.Errorf("failed to evaluate tx: %w", err)
}
return readEvaluateTxV6(raw)
}
// EvaluateTxError encapsulates the EvaluateTx errors and allows the results to be parsed
type EvaluateTxError struct {
message json.RawMessage
}
// Messages returns the raw messages from EvaluateTxError
func (s EvaluateTxError) Messages() json.RawMessage {
return s.message
}
// Error implements the error interface
func (s EvaluateTxError) Error() string {
return fmt.Sprintf("EvaluateTx failed: %v", string(s.message))
}
func readEvaluateTxV6(data []byte) (chainsync.Redeemer, error) {
value, dataType, _, err := jsonparser.Get(data, "error")
if err != nil {
if errors.Is(err, jsonparser.KeyPathNotFoundError) {
redeemerRaw, _, _, err := jsonparser.Get(data, "result")
if err != nil {
return nil, err
}
var v chainsync.EvaluationResult
err = json.Unmarshal(redeemerRaw, &v)
if err != nil {
return nil, fmt.Errorf("cannot parse result: %v to redeemer: %w", string(value), err)
}
result := make(chainsync.Redeemer)
for _, item := range v {
var redeemerValue chainsync.RedeemerValue
redeemerValue.Memory = item.Budget.Memory
redeemerValue.Steps = item.Budget.Steps
result[chainsync.RedeemerKey(item.Validator)] = redeemerValue
}
return result, nil
}
return nil, fmt.Errorf("failed to parse EvaluateTx response: %w", err)
}
switch dataType {
case jsonparser.Object:
return nil, EvaluateTxError{message: value}
default:
return nil, fmt.Errorf("EvaluateTx failed: %v", string(value))
}
}