bf693228a3
This adds a JS tracer runtime environment based on the Goja VM. The new runtime replaces the duktape runtime, which will be removed soon. Goja is implemented in Go and is faster for cases where the Go <-> JS transition overhead dominates overall performance. It is faster because duktape is written in C, and the transition cost includes the cost of using cgo. Another reason for using Goja is that go-duktape is not maintained anymore. We expect the performace of JS tracing to be at least as good or better with this change.
60 lines
1.8 KiB
Go
60 lines
1.8 KiB
Go
// Copyright 2017 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 tracers contains the actual JavaScript tracer assets.
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package tracers
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import (
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"embed"
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"io/fs"
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"strings"
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"unicode"
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)
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//go:embed *.js
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var files embed.FS
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// Load reads the built-in JS tracer files embedded in the binary and
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// returns a mapping of tracer name to source.
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func Load() (map[string]string, error) {
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var assetTracers = make(map[string]string)
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err := fs.WalkDir(files, ".", func(path string, d fs.DirEntry, err error) error {
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if err != nil {
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return err
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}
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if d.IsDir() {
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return nil
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}
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b, err := fs.ReadFile(files, path)
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if err != nil {
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return err
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}
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name := camel(strings.TrimSuffix(path, ".js"))
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assetTracers[name] = string(b)
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return nil
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})
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return assetTracers, err
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}
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// camel converts a snake cased input string into a camel cased output.
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func camel(str string) string {
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pieces := strings.Split(str, "_")
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for i := 1; i < len(pieces); i++ {
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pieces[i] = string(unicode.ToUpper(rune(pieces[i][0]))) + pieces[i][1:]
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}
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return strings.Join(pieces, "")
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}
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