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geth.go
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geth.go
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// Copyright 2020 Coinbase, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package optimism
import (
"bufio"
"context"
"fmt"
"io"
"log"
"os"
"os/exec"
"strings"
"golang.org/x/sync/errgroup"
)
const (
gethLogger = "geth"
gethStdErrLogger = "geth err"
)
// logPipe prints out logs from geth. We don't end when context
// is canceled beacause there are often logs printed after this.
func logPipe(pipe io.ReadCloser, identifier string) error {
reader := bufio.NewReader(pipe)
for {
str, err := reader.ReadString('\n')
if err != nil {
log.Println("closing", identifier, err)
return err
}
message := strings.ReplaceAll(str, "\n", "")
log.Println(identifier, message)
}
}
// StartGeth starts a geth daemon in another goroutine
// and logs the results to the console.
func StartGeth(ctx context.Context, arguments string, g *errgroup.Group) error {
parsedArgs := strings.Split(arguments, " ")
cmd := exec.Command(
"/app/geth",
parsedArgs...,
) // #nosec G204
stdout, err := cmd.StdoutPipe()
if err != nil {
return err
}
stderr, err := cmd.StderrPipe()
if err != nil {
return err
}
g.Go(func() error {
return logPipe(stdout, gethLogger)
})
g.Go(func() error {
return logPipe(stderr, gethStdErrLogger)
})
if err := cmd.Start(); err != nil {
return fmt.Errorf("%w: unable to start geth", err)
}
g.Go(func() error {
<-ctx.Done()
log.Println("sending interrupt to geth")
return cmd.Process.Signal(os.Interrupt)
})
return cmd.Wait()
}