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eth/tracers/js: add coinbase addr to ctx #30231

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Merged
merged 1 commit into from
Aug 15, 2024
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eth/tracers/js: add coinbase addr to ctx #30231

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6 changes: 6 additions & 0 deletions eth/tracers/js/goja.go
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Original file line number Diff line number Diff line change
Expand Up @@ -254,6 +254,12 @@ func (t *jsTracer) OnTxStart(env *tracing.VMContext, tx *types.Transaction, from
return
}
t.ctx["gasPrice"] = gasPriceBig
coinbase, err := t.toBuf(t.vm, env.Coinbase.Bytes())
if err != nil {
t.err = err
return
}
t.ctx["coinbase"] = t.vm.ToValue(coinbase)
}

// OnTxEnd implements the Tracer interface and is invoked at the end of
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3 changes: 3 additions & 0 deletions eth/tracers/js/tracer_test.go
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Expand Up @@ -154,6 +154,9 @@ func TestTracer(t *testing.T) {
want: "",
fail: "reached limit for padding memory slice: 1049568 at step (<eval>:1:83(20)) in server-side tracer function 'step'",
contract: []byte{byte(vm.PUSH1), byte(0xff), byte(vm.PUSH1), byte(0x00), byte(vm.MSTORE8), byte(vm.STOP)},
}, { // tests ctx.coinbase
code: "{lengths: [], step: function(log) { }, fault: function() {}, result: function(ctx) { var coinbase = ctx.coinbase; return toAddress(coinbase); }}",
want: `{"0":0,"1":0,"2":0,"3":0,"4":0,"5":0,"6":0,"7":0,"8":0,"9":0,"10":0,"11":0,"12":0,"13":0,"14":0,"15":0,"16":0,"17":0,"18":0,"19":0}`,
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@holiman holiman Aug 15, 2024

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I don't get it. What is this mapping? How does this correspond to return toAddress(coinbase); ?

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@lightclient lightclient Aug 15, 2024

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The mapping seems to be "string index" -> decimal value of byte at index. It's weird. But that's how the other tracer tests work.

It maps to the default coinbase of 0x0. We could change it to a non-zero value, but I don't see much benefit. If this PR isn't working correctly, it will return nothing (bc no ctx value for coinbase).

},
} {
if have, err := execTracer(tt.code, tt.contract); tt.want != string(have) || tt.fail != err {
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