sl4f_lib/common_utils/
fidl.rs

1// Copyright 2021 The Fuchsia Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4use anyhow::Error;
5use fidl::endpoints::{ClientEnd, ProtocolMarker};
6
7use glob::glob;
8
9/// Connects to a protocol served at a path that matches a glob pattern.
10///
11/// Returns a proxy to the first path that matches a pattern in `glob_paths`,
12/// or None if no matching paths exist.
13pub fn connect_in_paths<T: ProtocolMarker>(glob_paths: &[&str]) -> Result<Option<T::Proxy>, Error> {
14    let proxy = glob_paths
15        .iter()
16        .map(|glob_path| {
17            let found_path = glob(glob_path)?.find_map(Result::ok);
18            match found_path {
19                Some(path) => {
20                    let (client, server) = zx::Channel::create();
21                    fdio::service_connect(path.to_string_lossy().as_ref(), server)?;
22                    let client_end = ClientEnd::<T>::new(client);
23                    Ok(Some(client_end.into_proxy()))
24                }
25                None => Ok(None),
26            }
27        })
28        .collect::<Result<Vec<Option<T::Proxy>>, Error>>()?
29        .into_iter()
30        .find(|proxy| proxy.is_some())
31        .flatten();
32    Ok(proxy)
33}