| 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 |
| cmd.Env = []string{} |
| |
| 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 |
| } |