endhost_api_client/
client.rs

1// Copyright 2025 Anapaya Systems
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//   http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14//! # Endhost API client
15//!
16//! An [EndhostApiClient] provides the application with the information
17//! necessary to send and receive SCION-packets in the routing domain that is
18//! associated with the endhost API.
19//!
20//! The implementation [CrpcEndhostApiClient] is a concrete implementation
21//! following the current specification of the endhost-API.
22//!
23//! ## Example Usage
24//!
25//! ```no_run
26//! use std::{net::SocketAddr, str::FromStr};
27//!
28//! use endhost_api_client::client::{CrpcEndhostApiClient, EndhostApiClient};
29//! use scion_proto::address::IsdAsn;
30//!
31//! pub async fn get_all_udp_sockaddrs() -> anyhow::Result<Vec<SocketAddr>> {
32//!     let crpc_client =
33//!         CrpcEndhostApiClient::new(&url::Url::parse("http://10.0.0.1:48080/").unwrap())?;
34//!
35//!     let res = crpc_client
36//!         .list_underlays(IsdAsn::from_str("1-ff00:0:110").unwrap())
37//!         .await?
38//!         .udp_underlay
39//!         .iter()
40//!         .map(|router| router.internal_interface)
41//!         .collect();
42//!
43//!     Ok(res)
44//! }
45//! ```
46
47use std::{ops::Deref, sync::Arc};
48
49use endhost_api::routes::{
50    ENDHOST_API_V1, LIST_PATHS, LIST_UNDERLAYS, PATH_SERVICE, UNDERLAY_SERVICE,
51};
52use endhost_api_models::underlays::Underlays;
53use endhost_api_protobuf::endhost::api_service::v1::{
54    ListSegmentsRequest, ListSegmentsResponse, ListUnderlaysRequest, ListUnderlaysResponse,
55};
56use scion_proto::{address::IsdAsn, path::segment::Segments};
57use scion_sdk_reqwest_connect_rpc::{
58    client::{CrpcClient, CrpcClientError},
59    token_source::TokenSource,
60};
61
62/// Endhost API client trait.
63///
64/// This allows for a client mock implementation in tests.
65#[async_trait::async_trait]
66pub trait EndhostApiClient: Send + Sync {
67    /// List the available underlays for a given ISD-AS.
68    ///
69    /// # Arguments
70    /// * `isd_as` - The ISD-AS to list the underlays for. For a wildcard ISD AS
71    ///   (`IsdAsn::WILDCARD`), all existing underlays will be returned.
72    ///
73    /// # Returns
74    /// A future that resolves to the list of underlays.
75    async fn list_underlays(&self, isd_as: IsdAsn) -> Result<Underlays, CrpcClientError>;
76    /// List the available segments between a source and destination ISD-AS.
77    ///
78    /// # Arguments
79    /// * `src` - The source ISD-AS.
80    /// * `dst` - The destination ISD-AS.
81    /// * `page_size` - The maximum number of segments to return.
82    /// * `page_token` - The token to use for pagination.
83    async fn list_segments(
84        &self,
85        src: IsdAsn,
86        dst: IsdAsn,
87        page_size: i32,
88        page_token: String,
89    ) -> Result<Segments, CrpcClientError>;
90}
91
92/// Connect RPC endhost API client.
93pub struct CrpcEndhostApiClient {
94    client: CrpcClient,
95}
96
97impl Deref for CrpcEndhostApiClient {
98    type Target = CrpcClient;
99
100    fn deref(&self) -> &Self::Target {
101        &self.client
102    }
103}
104
105impl CrpcEndhostApiClient {
106    /// Creates a new endhost API client from the given base URL.
107    pub fn new(base_url: &url::Url) -> anyhow::Result<Self> {
108        Ok(CrpcEndhostApiClient {
109            client: CrpcClient::new(base_url)?,
110        })
111    }
112
113    /// Creates a new endhost API client from the given base URL and [`reqwest::Client`].
114    pub fn new_with_client(base_url: &url::Url, client: reqwest::Client) -> anyhow::Result<Self> {
115        Ok(CrpcEndhostApiClient {
116            client: CrpcClient::new_with_client(base_url, client)?,
117        })
118    }
119
120    /// Uses the provided token source for authentication.
121    pub fn use_token_source(&mut self, token_source: Arc<dyn TokenSource>) -> &mut Self {
122        self.client.use_token_source(token_source);
123        self
124    }
125}
126
127#[async_trait::async_trait]
128impl EndhostApiClient for CrpcEndhostApiClient {
129    async fn list_underlays(&self, isd_as: IsdAsn) -> Result<Underlays, CrpcClientError> {
130        self.client
131            .unary_request::<ListUnderlaysRequest, ListUnderlaysResponse>(
132                &format!("{ENDHOST_API_V1}.{UNDERLAY_SERVICE}{LIST_UNDERLAYS}"),
133                ListUnderlaysRequest {
134                    isd_as: Some(isd_as.into()),
135                },
136            )
137            .await?
138            .try_into()
139            .map_err(|e: url::ParseError| {
140                CrpcClientError::DecodeError {
141                    context: "parsing underlay address as URL".into(),
142                    source: e.into(),
143                    body: None,
144                }
145            })
146            .inspect(|resp| {
147                tracing::debug!(%resp, "Listed underlays");
148            })
149    }
150
151    async fn list_segments(
152        &self,
153        src: IsdAsn,
154        dst: IsdAsn,
155        page_size: i32,
156        page_token: String,
157    ) -> Result<Segments, CrpcClientError> {
158        self.client
159            .unary_request::<ListSegmentsRequest, ListSegmentsResponse>(
160                &format!("{ENDHOST_API_V1}.{PATH_SERVICE}{LIST_PATHS}"),
161                ListSegmentsRequest {
162                    src_isd_as: src.0,
163                    dst_isd_as: dst.0,
164                    page_size,
165                    page_token,
166                },
167            )
168            .await?
169            .try_into()
170            .map_err(
171                |e: scion_proto::path::convert::segment::InvalidSegmentError| {
172                    CrpcClientError::DecodeError {
173                        context: "decoding segments".into(),
174                        source: e.into(),
175                        body: None,
176                    }
177                },
178            )
179            .inspect(|resp| {
180                tracing::debug!(%resp, "Listed segments");
181            })
182    }
183}
endhost_api_client/client.rs

endhost_api_client/
client.rs
