go-ethereum/eth/tracers/internal/tracetest/util.go

package tracetest

import (
	"encoding/json"
	"reflect"
	"strings"
	"unicode"

	// Force-load native and js packages, to trigger registration
	_ "github.com/ethereum/go-ethereum/eth/tracers/js"
	_ "github.com/ethereum/go-ethereum/eth/tracers/native"
)

// To generate a new callTracer test, copy paste the makeTest method below into
// a Geth console and call it with a transaction hash you which to export.

/*
// makeTest generates a callTracer test by running a prestate reassembled and a
// call trace run, assembling all the gathered information into a test case.
var makeTest = function(tx, rewind) {
  // Generate the genesis block from the block, transaction and prestate data
  var block   = eth.getBlock(eth.getTransaction(tx).blockHash);
  var genesis = eth.getBlock(block.parentHash);

  delete genesis.gasUsed;
  delete genesis.logsBloom;
  delete genesis.parentHash;
  delete genesis.receiptsRoot;
  delete genesis.sha3Uncles;
  delete genesis.size;
  delete genesis.transactions;
  delete genesis.transactionsRoot;
  delete genesis.uncles;

  genesis.gasLimit  = genesis.gasLimit.toString();
  genesis.number    = genesis.number.toString();
  genesis.timestamp = genesis.timestamp.toString();

  genesis.alloc = debug.traceTransaction(tx, {tracer: "prestateTracer", rewind: rewind});
  for (var key in genesis.alloc) {
    var nonce = genesis.alloc[key].nonce;
    if (nonce) {
      genesis.alloc[key].nonce = nonce.toString();
    }
  }
  genesis.config = admin.nodeInfo.protocols.eth.config;

  // Generate the call trace and produce the test input
  var result = debug.traceTransaction(tx, {tracer: "callTracer", rewind: rewind});
  delete result.time;

  console.log(JSON.stringify({
    genesis: genesis,
    context: {
      number:     block.number.toString(),
      difficulty: block.difficulty,
      timestamp:  block.timestamp.toString(),
      gasLimit:   block.gasLimit.toString(),
      miner:      block.miner,
    },
    input:  eth.getRawTransaction(tx),
    result: result,
  }, null, 2));
}
*/

// jsonEqual is similar to reflect.DeepEqual, but does a 'bounce' via json prior to
// comparison
func jsonEqual(xi, yi, xt, yt interface{}) bool {
	if xj, err := json.Marshal(xi); err == nil {
		json.Unmarshal(xj, xt)
	} else {
		return false
	}
	if yj, err := json.Marshal(yi); err == nil {
		json.Unmarshal(yj, yt)
	} else {
		return false
	}
	return reflect.DeepEqual(xt, yt)
}

// camel converts a snake cased input string into a camel cased output.
func camel(str string) string {
	pieces := strings.Split(str, "_")
	for i := 1; i < len(pieces); i++ {
		pieces[i] = string(unicode.ToUpper(rune(pieces[i][0]))) + pieces[i][1:]
	}
	return strings.Join(pieces, "")
}