func enable()

in main/cmds.go [157:196]
29 lines of code
6 McCabe index (conditional complexity)

func enable(ctx *log.Context, h HandlerEnvironment, seqNum int) (string, error) {
	// parse the extension handler settings (not available prior to 'enable')
	cfg, err := parseAndValidateSettings(ctx, h.HandlerEnvironment.ConfigFolder, seqNum)
	if err != nil {
		return "", errors.Wrap(err, "failed to get configuration")
	}

	dir := filepath.Join(dataDir, downloadDir, fmt.Sprintf("%d", seqNum))
	if err := downloadFiles(ctx, dir, cfg); err != nil {
		return "", errors.Wrap(err, "processing file downloads failed")
	}

	// execute the command, save its error
	runErr := runCmd(ctx, dir, cfg)

	// collect the logs if available
	stdoutF, stderrF := logPaths(dir)
	stdoutTail, err := tailFile(stdoutF, maxTailLen)
	if err != nil {
		ctx.Log("message", "error tailing stdout logs", "error", err)
	}
	stderrTail, err := tailFile(stderrF, maxTailLen)
	if err != nil {
		ctx.Log("message", "error tailing stderr logs", "error", err)
	}

	isSuccess := runErr == nil
	telemetry("Output", "-- stdout/stderr omitted from telemetry pipeline --", isSuccess, 0)

	if isSuccess {
		ctx.Log("event", "enabled")
	} else {
		ctx.Log("event", "enable script failed")
	}

	msg := fmt.Sprintf("\n[stdout]\n%s\n[stderr]\n%s", string(stdoutTail), string(stderrTail))
	// Always report nil for error because extension should not fail if script throws error
	// Error still will be reported in the message
	return msg, nil
}