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package python
import (
"bufio"
"context"
"fmt"
"io"
"log"
"os"
"os/exec"
"strconv"
"strings"
"sync"
"time"
"github.com/bazelbuild/rules_go/go/tools/bazel"
)
var (
stdModulesStdin io.Writer
stdModulesStdout io.Reader
stdModulesMutex sync.Mutex
stdModulesSeen map[string]struct{}
)
func init() {
stdModulesSeen = make(map[string]struct{})
stdModulesScriptRunfile, err := bazel.Runfile("gazelle/std_modules")
if err != nil {
log.Printf("failed to initialize std_modules: %v\n", err)
os.Exit(1)
}
ctx := context.Background()
ctx, stdModulesCancel := context.WithTimeout(ctx, time.Minute*5)
cmd := exec.CommandContext(ctx, stdModulesScriptRunfile)
cmd.Stderr = os.Stderr
// All userland site-packages should be ignored.
cmd.Env = []string{"PYTHONNOUSERSITE=1"}
stdin, err := cmd.StdinPipe()
if err != nil {
log.Printf("failed to initialize std_modules: %v\n", err)
os.Exit(1)
}
stdModulesStdin = stdin
stdout, err := cmd.StdoutPipe()
if err != nil {
log.Printf("failed to initialize std_modules: %v\n", err)
os.Exit(1)
}
stdModulesStdout = stdout
if err := cmd.Start(); err != nil {
log.Printf("failed to initialize std_modules: %v\n", err)
os.Exit(1)
}
go func() {
defer stdModulesCancel()
if err := cmd.Wait(); err != nil {
log.Printf("failed to wait for std_modules: %v\n", err)
os.Exit(1)
}
}()
}
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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