Add call tracer js implementation by Frozen · Pull Request #5022 · harmony-one/harmony

Frozen · 2026-03-24T03:16:37Z

Adds a JavaScript-based callTracer implementation to the Harmony tracer subsystem, embedding the JS asset and registering a dedicated tracer lookup so callers can request callTracer by name.

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Pull request overview

Adds a JavaScript-based callTracer implementation to the Harmony tracer subsystem, embedding the JS asset and registering a dedicated tracer lookup so callers can request callTracer by name.

Changes:

Introduces hmy/tracers/js/call_tracer.go registering a non-wildcard lookup for "callTracer".
Embeds call_tracer.js as a gzipped byte payload with a small bindata-style loader.
Loads tracer assets during package init and routes "callTracer" construction through newJsTracer.

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mur-me · 2026-04-02T16:51:49Z

@Frozen please rebase it to the latest dev

mur-me · 2026-04-02T17:32:33Z

Tested on the archival endpoints:

debug_traceTransaction with "tracer": "callTracer" is still an issue

curl -q --location 'https://a.api.s0.t.hmny.io' --header 'Content-Type: application/json' --data '{
    "jsonrpc": "2.0",
    "method": "debug_traceTransaction",
    "params": [
        "0x26084ceb7e5b84c8b77cb5391ff2007fcd90b20fc2f6004100b3f8599ad2cc83",
        {
            "tracer": "callTracer"
        }
    ],
    "id": 0
}' | jq
{
  "jsonrpc": "2.0",
  "id": 0,
  "error": {
    "code": -32000,
    "message": "incorrect number of top-level calls"
  }
}

trace_transaction is working fine:

curl -q --location 'https://a.api.s0.t.hmny.io' --header 'Content-Type: application/json' --data-raw '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "trace_transaction",
    "params": ["0x11058254015c3c47b9d6f3be152bc637f853f29381b1fe36ef3c41441b9be046"]
}' | jq
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": [
    {
      "blockNumber": 86444511,
      "blockHash": "0x284ff7497588a114f97dee0b66a86991b9394e76da66167a2218e7bdebccc973",
...

Frozen · 2026-04-02T23:17:26Z

@Frozen please rebase it to the latest dev

Updated

mur-me · 2026-04-28T12:11:26Z

Hey @Frozen, can you please take a look on the failed test - https://app.travis-ci.com/github/harmony-one/harmony/jobs/639081720

>       assert response["gas"] == "0x0"
E       AssertionError: assert '0x5208' == '0x0'
E         - 0x0
E         + 0x5208

In fact, what we have right now is the following

response["gas"] == "0x5208"
response["gasUsed"] == "0x0"

On latest go-ethereum — currently Geth v1.17.2 stable — for your exact debug_traceCall + callTracer case, it should be:

assert response["gas"] == "0x5208"
assert response["gasUsed"] == "0x5208"

Latest Geth’s native callTracer includes the depth-0 frame, and docs define gas as "gas provided for call" and gasUsed as "gas used during call", link - https://geth.ethereum.org/docs/developers/evm-tracing/built-in-tracers#call-tracer

…registration

mur-me · 2026-05-07T15:07:22Z

Hooray, it is wokring!

curl --location -s 'https://api-aa.s0.b.hmny.io' --header 'Content-Type: application/json' --data '{
    "jsonrpc": "2.0",
    "method": "debug_traceTransaction",
    "params": [
        "0x6fcd44a78b9d6757cc6c439b24294aecb860c964ccaf73211afaa0da05b0a69c",
        {
            "tracer": "callTracer"
        }
    ],
    "id": 0
}' |jq

{
  "jsonrpc": "2.0",
  "id": 0,
  "result": {
    "type": "CALL",
    "from": "0xf59de020d650e69ef0755bf37f3d16b80ee132f5",
    "to": "0xc22834581ebc8527d974f8a1c97e1bea4ef910bc",
    "value": "0x0",
    "gas": "0x3d2de",
    "gasUsed": "0x3c57e",
    "input": "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",
    "output": "0x000000000000000000000000e6c18776027c2da24a487e352ec93eb3acef62f2",
    "time": "17.859278ms",
    "calls": [
      {
        "type": "CREATE2",
        "from": "0xc22834581ebc8527d974f8a1c97e1bea4ef910bc",
        "to": "0xe6c18776027c2da24a487e352ec93eb3acef62f2",
        "value": "0x0",
        "gas": "0x33d16",
        "gasUsed": "0xd80d",
        "input": "0x608060405234801561001057600080fd5b506040516101e63803806101e68339818101604052602081101561003357600080fd5b8101908080519060200190929190505050600073ffffffffffffffffffffffffffffffffffffffff168173ffffffffffffffffffffffffffffffffffffffff1614156100ca576040517f08c379a00000000000000000000000000000000000000000000000000000000081526004018080602001828103825260228152602001806101c46022913960400191505060405180910390fd5b806000806101000a81548173ffffffffffffffffffffffffffffffffffffffff021916908373ffffffffffffffffffffffffffffffffffffffff1602179055505060ab806101196000396000f3fe608060405273ffffffffffffffffffffffffffffffffffffffff600054167fa619486e0000000000000000000000000000000000000000000000000000000060003514156050578060005260206000f35b3660008037600080366000845af43d6000803e60008114156070573d6000fd5b3d6000f3fea2646970667358221220d1429297349653a4918076d650332de1a1068c5f3e07c5c82360c277770b955264736f6c63430007060033496e76616c69642073696e676c65746f6e20616464726573732070726f7669646564000000000000000000000000fb1bffc9d739b8d520daf37df666da4c687191ea",
        "output": "0x608060405273ffffffffffffffffffffffffffffffffffffffff600054167fa619486e0000000000000000000000000000000000000000000000000000000060003514156050578060005260206000f35b3660008037600080366000845af43d6000803e60008114156070573d6000fd5b3d6000f3fea2646970667358221220d1429297349653a4918076d650332de1a1068c5f3e07c5c82360c277770b955264736f6c63430007060033"
      },
      {
        "type": "CALL",
        "from": "0xc22834581ebc8527d974f8a1c97e1bea4ef910bc",
        "to": "0xe6c18776027c2da24a487e352ec93eb3acef62f2",
        "value": "0x0",
        "gas": "0x26535",
        "gasUsed": "0x25be4",
        "input": "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",
        "output": "0x",
        "calls": [
          {
            "type": "DELEGATECALL",
            "from": "0xe6c18776027c2da24a487e352ec93eb3acef62f2",
            "to": "0xfb1bffc9d739b8d520daf37df666da4c687191ea",
            "gas": "0x25546",
            "gasUsed": "0x25546",
            "input": "0xb63e800d0000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000160000000000000000000000000017062a1de2fe6b99be3d9d37841fed19f5738040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000000f59de020d650e69ef0755bf37f3d16b80ee132f500000000000000000000000045b96ed5d5b18f4f865266d8371c662cd241e6d50000000000000000000000000000000000000000000000000000000000000000",
            "output": "0x"
          }
        ]
      }
    ]
  }
}

mur-me · 2026-05-07T15:11:40Z

Same for the trace_transaction

curl -q --location 'https://api-aa.s0.b.hmny.io' --header 'Content-Type: application/json' --data-raw '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "trace_transaction",
    "params": ["0x6fcd44a78b9d6757cc6c439b24294aecb860c964ccaf73211afaa0da05b0a69c"]
}' | jq

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": [
    {
      "blockNumber": 48958229,
      "blockHash": "0xbf7771c798a2e33203d8d16864b2b2507e8d5c559d6467f8b6f61a65e60cc419",
      "transactionHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
      "transactionPosition": 0,
      "subtraces": 2,
      "traceAddress": [],
      "type": "call",
      "action": {
        "callType": "call",
        "value": "0x0",
        "to": "0xc22834581ebc8527d974f8a1c97e1bea4ef910bc",
        "gas": "0x3d2de",
        "from": "0xf59de020d650e69ef0755bf37f3d16b80ee132f5",
        "input": "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"
      },
      "result": {
        "output": "0x000000000000000000000000e6c18776027c2da24a487e352ec93eb3acef62f2",
        "gasUsed": "0x3c57e"
      }
    },
    {
      "blockNumber": 48958229,
      "blockHash": "0xbf7771c798a2e33203d8d16864b2b2507e8d5c559d6467f8b6f61a65e60cc419",
      "transactionHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
      "transactionPosition": 0,
      "subtraces": 0,
      "traceAddress": [
        0
      ],
      "type": "create",
      "action": {
        "from": "0xc22834581ebc8527d974f8a1c97e1bea4ef910bc",
        "gas": "0x33d16",
        "init": "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",
        "value": "0x0"
      },
      "result": {
        "address": "0xe6c18776027c2da24a487e352ec93eb3acef62f2",
        "code": "0x608060405273ffffffffffffffffffffffffffffffffffffffff600054167fa619486e0000000000000000000000000000000000000000000000000000000060003514156050578060005260206000f35b3660008037600080366000845af43d6000803e60008114156070573d6000fd5b3d6000f3fea2646970667358221220d1429297349653a4918076d650332de1a1068c5f3e07c5c82360c277770b955264736f6c63430007060033",
        "gasUsed": "0xd80d"
      }
    },
    {
      "blockNumber": 48958229,
      "blockHash": "0xbf7771c798a2e33203d8d16864b2b2507e8d5c559d6467f8b6f61a65e60cc419",
      "transactionHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
      "transactionPosition": 0,
      "subtraces": 1,
      "traceAddress": [
        1
      ],
      "type": "call",
      "action": {
        "callType": "call",
        "value": "0x0",
        "to": "0xe6c18776027c2da24a487e352ec93eb3acef62f2",
        "gas": "0x26535",
        "from": "0xc22834581ebc8527d974f8a1c97e1bea4ef910bc",
        "input": "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"
      },
      "result": {
        "output": "0x",
        "gasUsed": "0x25be4"
      }
    },
    {
      "blockNumber": 48958229,
      "blockHash": "0xbf7771c798a2e33203d8d16864b2b2507e8d5c559d6467f8b6f61a65e60cc419",
      "transactionHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
      "transactionPosition": 0,
      "subtraces": 0,
      "traceAddress": [
        1,
        0
      ],
      "type": "call",
      "action": {
        "callType": "delegatecall",
        "to": "0xfb1bffc9d739b8d520daf37df666da4c687191ea",
        "gas": "0x25546",
        "from": "0xe6c18776027c2da24a487e352ec93eb3acef62f2",
        "input": "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"
      },
      "result": {
        "output": "0x",
        "gasUsed": "0x25546"
      }
    }
  ]
}

mur-me · 2026-05-08T13:09:09Z

Hey @Frozen, please also remove this debug log that is just landing in our stdout https://github.com/harmony-one/harmony/blob/dev/hmy/tracer.go#L779

Frozen · 2026-05-08T21:51:17Z

removed @mur-me

mur-me · 2026-05-11T09:45:42Z

Checking this on the testnet rn

mur-me · 2026-05-11T11:27:38Z

Nice, now more such logs, approved, let's merge

Frozen self-assigned this Mar 24, 2026

Frozen changed the title ~~Add call tracer implementation with asset loading~~ Add call tracer js implementation Mar 24, 2026

Frozen requested a review from Copilot March 26, 2026 14:38

Copilot started reviewing on behalf of Frozen March 26, 2026 14:38 View session

Copilot AI reviewed Mar 26, 2026

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Comment thread hmy/tracers/js/call_tracer.go

Comment thread hmy/tracers/js/call_tracer.go

Comment thread hmy/tracers/js/call_tracer.go Outdated

Comment thread hmy/tracers/js/call_tracer.go

Comment thread hmy/tracers/js/call_tracer.go

mur-me requested review from GheisMohammadi and mur-me April 1, 2026 13:11

harmony-one deleted a comment from Copilot AI Apr 1, 2026

Frozen force-pushed the fixed-call-tracer branch 3 times, most recently from 77405bc to 98698d1 Compare April 2, 2026 23:15

Frozen added 3 commits April 29, 2026 17:49

feat(tracers): add call tracer implementation with asset loading

3583825

refactor(tracers): remove unnecessary log statement from call tracer …

c417aab

…registration

refactor(tracers): remove init function for call tracer registration

e68df47

Frozen force-pushed the fixed-call-tracer branch from 735dc9b to e68df47 Compare April 29, 2026 21:49

fix(goja): update gas context value to use dynamic gas variable

fa6f711

mur-me approved these changes May 7, 2026

View reviewed changes

refactor(tracers): remove debug print statement from ParityBlockTracer

df53904

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Pull request overview

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mur-me commented Apr 2, 2026

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Frozen commented Mar 24, 2026 •

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