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// Copyright 2023 The Bazel Authors. All rights reserved.
//
// 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 python
import (
"bufio"
"context"
_ "embed"
"fmt"
"io"
"log"
"os"
"os/exec"
"strconv"
"strings"
"sync"
)
var (
stdModulesCmd *exec.Cmd
stdModulesStdin io.WriteCloser
stdModulesStdout io.Reader
stdModulesMutex sync.Mutex
stdModulesSeen map[string]struct{}
)
func startStdModuleProcess(ctx context.Context) {
stdModulesSeen = make(map[string]struct{})
// due to #691, we need a system interpreter to boostrap, part of which is
// to locate the hermetic interpreter.
stdModulesCmd = exec.CommandContext(ctx, "python3", helperPath, "std_modules")
stdModulesCmd.Stderr = os.Stderr
// All userland site-packages should be ignored.
stdModulesCmd.Env = []string{"PYTHONNOUSERSITE=1"}
stdin, err := stdModulesCmd.StdinPipe()
if err != nil {
log.Printf("failed to initialize std_modules: %v\n", err)
os.Exit(1)
}
stdModulesStdin = stdin
stdout, err := stdModulesCmd.StdoutPipe()
if err != nil {
log.Printf("failed to initialize std_modules: %v\n", err)
os.Exit(1)
}
stdModulesStdout = stdout
if err := stdModulesCmd.Start(); err != nil {
log.Printf("failed to initialize std_modules: %v\n", err)
os.Exit(1)
}
}
func shutdownStdModuleProcess() {
if err := stdModulesStdin.Close(); err != nil {
fmt.Fprintf(os.Stderr, "error closing std module: %v", err)
}
if err := stdModulesCmd.Wait(); err != nil {
log.Printf("failed to wait for std_modules: %v\n", err)
}
}
func isStdModule(m module) (bool, error) {
if _, seen := stdModulesSeen[m.Name]; seen {
return true, nil
}
stdModulesMutex.Lock()
defer stdModulesMutex.Unlock()
fmt.Fprintf(stdModulesStdin, "%s\n", m.Name)
stdoutReader := bufio.NewReader(stdModulesStdout)
line, err := stdoutReader.ReadString('\n')
if err != nil {
return false, err
}
if len(line) == 0 {
return false, fmt.Errorf("unexpected empty output from std_modules")
}
isStd, err := strconv.ParseBool(strings.TrimSpace(line))
if err != nil {
return false, err
}
if isStd {
stdModulesSeen[m.Name] = struct{}{}
return true, nil
}
return false, nil
}
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