mirror of https://github.com/ethereum/go-ethereum
eth/tracers: add multiplexing tracer (#26086)
* eth/tracers: add native multiplexing tracer * minor improv callTracer * mv evm cancellation to apipull/26139/head
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// Copyright 2022 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package native |
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import ( |
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"encoding/json" |
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"math/big" |
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"time" |
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"github.com/ethereum/go-ethereum/common" |
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"github.com/ethereum/go-ethereum/core/vm" |
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"github.com/ethereum/go-ethereum/eth/tracers" |
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) |
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func init() { |
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register("muxTracer", newMuxTracer) |
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} |
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// muxTracer is a go implementation of the Tracer interface which
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// runs multiple tracers in one go.
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type muxTracer struct { |
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names []string |
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tracers []tracers.Tracer |
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} |
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// newMuxTracer returns a new mux tracer.
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func newMuxTracer(ctx *tracers.Context, cfg json.RawMessage) (tracers.Tracer, error) { |
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var config map[string]json.RawMessage |
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if cfg != nil { |
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if err := json.Unmarshal(cfg, &config); err != nil { |
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return nil, err |
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} |
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} |
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objects := make([]tracers.Tracer, 0, len(config)) |
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names := make([]string, 0, len(config)) |
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for k, v := range config { |
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t, err := tracers.New(k, ctx, v) |
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if err != nil { |
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return nil, err |
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} |
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objects = append(objects, t) |
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names = append(names, k) |
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} |
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return &muxTracer{names: names, tracers: objects}, nil |
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} |
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// CaptureStart implements the EVMLogger interface to initialize the tracing operation.
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func (t *muxTracer) CaptureStart(env *vm.EVM, from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) { |
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for _, t := range t.tracers { |
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t.CaptureStart(env, from, to, create, input, gas, value) |
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} |
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} |
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// CaptureEnd is called after the call finishes to finalize the tracing.
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func (t *muxTracer) CaptureEnd(output []byte, gasUsed uint64, elapsed time.Duration, err error) { |
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for _, t := range t.tracers { |
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t.CaptureEnd(output, gasUsed, elapsed, err) |
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} |
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} |
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// CaptureState implements the EVMLogger interface to trace a single step of VM execution.
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func (t *muxTracer) CaptureState(pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, rData []byte, depth int, err error) { |
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for _, t := range t.tracers { |
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t.CaptureState(pc, op, gas, cost, scope, rData, depth, err) |
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} |
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} |
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// CaptureFault implements the EVMLogger interface to trace an execution fault.
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func (t *muxTracer) CaptureFault(pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, depth int, err error) { |
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for _, t := range t.tracers { |
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t.CaptureFault(pc, op, gas, cost, scope, depth, err) |
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} |
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} |
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// CaptureEnter is called when EVM enters a new scope (via call, create or selfdestruct).
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func (t *muxTracer) CaptureEnter(typ vm.OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) { |
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for _, t := range t.tracers { |
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t.CaptureEnter(typ, from, to, input, gas, value) |
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} |
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} |
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// CaptureExit is called when EVM exits a scope, even if the scope didn't
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// execute any code.
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func (t *muxTracer) CaptureExit(output []byte, gasUsed uint64, err error) { |
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for _, t := range t.tracers { |
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t.CaptureExit(output, gasUsed, err) |
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} |
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} |
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func (t *muxTracer) CaptureTxStart(gasLimit uint64) { |
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for _, t := range t.tracers { |
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t.CaptureTxStart(gasLimit) |
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} |
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} |
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func (t *muxTracer) CaptureTxEnd(restGas uint64) { |
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for _, t := range t.tracers { |
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t.CaptureTxEnd(restGas) |
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} |
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} |
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// GetResult returns an empty json object.
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func (t *muxTracer) GetResult() (json.RawMessage, error) { |
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resObject := make(map[string]json.RawMessage) |
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for i, tt := range t.tracers { |
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r, err := tt.GetResult() |
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if err != nil { |
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return nil, err |
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} |
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resObject[t.names[i]] = r |
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} |
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res, err := json.Marshal(resObject) |
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if err != nil { |
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return nil, err |
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} |
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return res, nil |
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} |
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// Stop terminates execution of the tracer at the first opportune moment.
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func (t *muxTracer) Stop(err error) { |
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for _, t := range t.tracers { |
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t.Stop(err) |
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} |
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} |
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