1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
use std::collections::BTreeMap;
use std::path::{Path, PathBuf};
use std::sync::Arc;
use std::time::{Duration, SystemTime};
use tokio::sync::watch;
use crate::kube::{KubeClient, KubeError, NodeEvent};
use crate::nodes::{NodeList, NodeSet};
use crate::routes::{ANNOTATION_DID, ANNOTATION_ENDPOINT, EndpointBytes, RouteTable};
use crate::stats::Stats;
pub const PEERS_FILE_POLL: Duration = Duration::from_secs(2);
pub const KUBE_RETRY_MIN: Duration = Duration::from_secs(1);
pub const KUBE_RETRY_MAX: Duration = Duration::from_secs(30);
pub const ANNOTATE_RETRY: Duration = Duration::from_secs(5);
pub const NODE_READER_HINT: &str = "the node authorizer lets a node read only its own Node (AuthorizeNodeWithSelectors); apply rust/socialweb-meshd/deploy/node-reader-rbac.yaml to grant group system:nodes get/list/watch on nodes";
#[derive(Clone)]
pub struct SelfIdentity {
pub node_name: String,
pub endpoint: EndpointBytes,
pub endpoint_hex: String,
pub did: String,
}
#[derive(Debug)]
pub enum SourceError {
Config(String),
Forbidden(String),
}
impl std::fmt::Display for SourceError {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
SourceError::Config(msg) => write!(f, "{msg}"),
SourceError::Forbidden(msg) => write!(f, "{msg}"),
}
}
}
fn publish(
me: &SelfIdentity,
nodes: &NodeSet,
tx: &watch::Sender<Arc<RouteTable>>,
stats: &Stats,
) -> Arc<RouteTable> {
let table = Arc::new(RouteTable::compute(
&me.node_name,
&me.endpoint,
&nodes.to_vec(),
));
Stats::bump(&stats.node_list_updates);
let changed = **tx.borrow() != *table;
if changed {
tracing::info!(
event = "routes",
own_pod_cidrs = ?table.own_cidrs.iter().map(ToString::to_string).collect::<Vec<_>>(),
routes = ?table.routes.iter().map(|r| format!("{}->{}", r.cidr, r.node)).collect::<Vec<_>>(),
rejected = ?table.rejected.iter().map(|r| format!("{}: {}", r.node, r.reason)).collect::<Vec<_>>()
);
tx.send_replace(Arc::clone(&table));
}
table
}
pub fn read_peers_file(path: &Path) -> Result<NodeList, String> {
let bytes = std::fs::read(path).map_err(|err| format!("read {}: {err}", path.display()))?;
serde_json::from_slice(&bytes)
.map_err(|err| format!("parse {} as a NodeList: {err}", path.display()))
}
fn modified(path: &Path) -> Option<SystemTime> {
std::fs::metadata(path).and_then(|m| m.modified()).ok()
}
pub async fn run_peers_file(
path: PathBuf,
me: SelfIdentity,
tx: watch::Sender<Arc<RouteTable>>,
stats: Arc<Stats>,
first: NodeList,
) {
let mut seen = modified(&path);
publish(&me, &NodeSet::from_list(first), &tx, &stats);
loop {
tokio::time::sleep(PEERS_FILE_POLL).await;
let now = modified(&path);
if now == seen {
continue;
}
seen = now;
match read_peers_file(&path) {
Ok(list) => {
publish(&me, &NodeSet::from_list(list), &tx, &stats);
}
Err(err) => tracing::warn!(event = "peers_file_unreadable", error = %err),
}
}
}
fn annotations(me: &SelfIdentity) -> BTreeMap<String, String> {
BTreeMap::from([
(ANNOTATION_ENDPOINT.to_string(), me.endpoint_hex.clone()),
(ANNOTATION_DID.to_string(), me.did.clone()),
])
}
pub fn kube_client(path: &Path) -> Result<Option<KubeClient>, SourceError> {
if !path.exists() {
return Ok(None);
}
match KubeClient::from_kubeconfig(path) {
Ok(client) => Ok(Some(client)),
Err(KubeError::Config(msg)) if msg.starts_with("read ") => Ok(None),
Err(err) => Err(SourceError::Config(err.to_string())),
}
}
pub async fn run_annotator(
kubeconfig: PathBuf,
me: SelfIdentity,
mut routes: watch::Receiver<Arc<RouteTable>>,
) -> Result<(), SourceError> {
loop {
let needs = {
let table = routes.borrow_and_update();
table.self_view.seen && !table.self_annotated_with(&me.endpoint_hex, &me.did)
};
if needs {
if let Some(client) = kube_client(&kubeconfig)? {
match client
.patch_node_annotations(&me.node_name, &annotations(&me))
.await
{
Ok(()) => {
tracing::info!(event = "node_annotated", node = %me.node_name, endpoint = %me.endpoint_hex, did = %me.did);
}
Err(KubeError::Status { code: 403, body }) => {
return Err(SourceError::Forbidden(format!(
"patching Node {} was forbidden ({body}); --node-name must be the node the kubeconfig's identity is",
me.node_name
)));
}
Err(err) => {
tracing::warn!(event = "annotate_failed", node = %me.node_name, error = %err);
}
}
}
tokio::select! {
changed = routes.changed() => if changed.is_err() { return Ok(()) },
() = tokio::time::sleep(ANNOTATE_RETRY) => {}
}
} else if routes.changed().await.is_err() {
return Ok(());
}
}
}
pub async fn run_kube(
kubeconfig: PathBuf,
me: SelfIdentity,
tx: watch::Sender<Arc<RouteTable>>,
stats: Arc<Stats>,
) -> Result<(), SourceError> {
let mut retry = KUBE_RETRY_MIN;
loop {
let client = match kube_client(&kubeconfig)? {
Some(client) => client,
None => {
tracing::info!(event = "kubeconfig_waiting", path = %kubeconfig.display());
tokio::time::sleep(retry).await;
retry = (retry * 2).min(KUBE_RETRY_MAX);
continue;
}
};
let list = match client.list_nodes().await {
Ok(list) => list,
Err(KubeError::Status { code: 403, body }) => {
tracing::error!(
event = "list_nodes_forbidden",
error = %body,
hint = NODE_READER_HINT,
retry_in_ms = retry.as_millis() as u64
);
tokio::time::sleep(retry).await;
retry = (retry * 2).min(KUBE_RETRY_MAX);
continue;
}
Err(err) => {
tracing::warn!(event = "list_nodes_failed", error = %err, retry_in_ms = retry.as_millis() as u64);
tokio::time::sleep(retry).await;
retry = (retry * 2).min(KUBE_RETRY_MAX);
continue;
}
};
retry = KUBE_RETRY_MIN;
let version = list.metadata.resource_version.clone().unwrap_or_default();
let mut nodes = NodeSet::from_list(list);
let table = publish(&me, &nodes, &tx, &stats);
if !table.self_view.seen {
tracing::info!(event = "own_node_waiting", node = %me.node_name);
}
let watch_started = tokio::time::Instant::now();
let watched = client
.watch_nodes(&version, |event| {
let dirty = match event {
NodeEvent::Upsert(node) => {
nodes.upsert(*node);
true
}
NodeEvent::Delete(name, _) => {
nodes.remove(&name);
true
}
NodeEvent::Bookmark(_) | NodeEvent::Gone => false,
};
if dirty {
publish(&me, &nodes, &tx, &stats);
}
})
.await;
match watched {
Ok(_) => tracing::debug!(event = "watch_ended_relisting"),
Err(err) if err.is_gone() => tracing::info!(event = "watch_expired_relisting"),
Err(err) => tracing::warn!(event = "watch_failed", error = %err),
}
if watch_started.elapsed() < KUBE_RETRY_MIN {
tokio::time::sleep(KUBE_RETRY_MIN).await;
}
}
}
