debug_traceblock

How to use it

// yarn add @tatumio/tatum

import { TatumSDK, Klaytn, Network } from '@tatumio/tatum'

const tatum = await TatumSDK.init<Klaytn>({ network: Network.KLAYTN })

const result = await tatum.rpc.debugTraceBlock('0x80F8C7A', {
  tracer: 'callTracer',
  tracerConfig: {
    onlyTopCall: true,
    timeout: '5s',
  },
})

await tatum.destroy() // Destroy Tatum SDK - needed for stopping background jobs

Overview

debug_traceBlock is an RPC method that allows developers to trace all transactions within a block using a given tracer. This is particularly useful for analyzing the behavior of all transactions in a block, investigating potential issues, and understanding the flow of execution within smart contracts.

By using the debug_traceBlock, developers can obtain detailed insights into the execution flow of each transaction, allowing for in-depth analysis and debugging

Parameters

• block - String
  • RLP encoded block object.
• options (optional): An object containing configuration options for the tracer.
  • tracer: The tracer object with the following fields:
    • callTracer: The calltracer keeps track of all call frames, including depth 0 calls, made during a transaction.
    • prestateTracer: The prestateTracer replays the transaction and tracks every part of the state that occurred during the transaction.
  • tracerConfig: The object to specify the configurations of the tracer.
    • onlyTopCall: When set to true, it traces only the primary (top-level) call and not any sub-calls, eliminating additional processing for each call frame.

Return Object

The return object is an array of all invoked opcodes of all transaction that were included in this block.

• type: The type of the call.
• from: The address from which the transaction is sent.
• to: The address to which the transaction is directed.
• value: The integer value sent with this transaction.
• gas: The integer value of the gas provided for the transaction execution.
• gasUsed: The integer value of the gas used.
• input: The data given at the time of input.
• output: The data returned as an output.
• calls: A list of sub-calls made during the transaction, including detailed trace information for each sub-call.

{% hint style="info" %}
This method is available only on the full archive node.
{% endhint %}

JSON-RPC Request and Response Examples

Request

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "debug_traceBlock",
  "params": [
    "0x1dc....",
    {
      "tracer": "callTracer"
    }
  ]
}

Response

{
  "id": 1,
  "jsonrpc": "2.0",
  "result": [
    {
      "result": {
        "from": "0x8894e0a0c962cb723c1976a4421c95949be2d4e3",
        "gas": "0x2d48c",
        "gasUsed": "0xc7ab",
        "to": "0x55d398326f99059ff775485246999027b3197955",
        "input": "0xa9059cbb0000000000000000000000003b9f33b3a9d382fa60283c555bde8f78855957be00000000000000000000000000000000000000000000000d4e7f4f79da7c0000",
        "output": "0x0000000000000000000000000000000000000000000000000000000000000001",
        "value": "0x0",
        "type": "CALL"
      }
    }
  ]
}