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
|
use std::sync::Arc;
use std::time::Duration;
use tokio::sync::watch;
use tokio::sync::Mutex;
use netapp::endpoint::Endpoint;
use netapp::peering::fullmesh::FullMeshPeeringStrategy;
use netapp::NodeID;
use garage_util::config::Config;
use garage_util::data::*;
use garage_util::error::*;
use garage_util::persister::Persister;
use super::*;
use crate::rpc_helper::*;
use crate::system::*;
pub struct LayoutManager {
replication_factor: usize,
persist_cluster_layout: Persister<LayoutHistory>,
pub layout_watch: watch::Receiver<Arc<LayoutHistory>>,
update_layout: Mutex<watch::Sender<Arc<LayoutHistory>>>,
pub(crate) rpc_helper: RpcHelper,
system_endpoint: Arc<Endpoint<SystemRpc, System>>,
}
impl LayoutManager {
pub fn new(
config: &Config,
node_id: NodeID,
system_endpoint: Arc<Endpoint<SystemRpc, System>>,
fullmesh: Arc<FullMeshPeeringStrategy>,
replication_factor: usize,
) -> Result<Self, Error> {
let persist_cluster_layout: Persister<LayoutHistory> =
Persister::new(&config.metadata_dir, "cluster_layout");
let cluster_layout = match persist_cluster_layout.load() {
Ok(x) => {
if x.current().replication_factor != replication_factor {
return Err(Error::Message(format!(
"Prevous cluster layout has replication factor {}, which is different than the one specified in the config file ({}). The previous cluster layout can be purged, if you know what you are doing, simply by deleting the `cluster_layout` file in your metadata directory.",
x.current().replication_factor,
replication_factor
)));
}
x
}
Err(e) => {
info!(
"No valid previous cluster layout stored ({}), starting fresh.",
e
);
LayoutHistory::new(replication_factor)
}
};
let (update_layout, layout_watch) = watch::channel(Arc::new(cluster_layout));
let rpc_helper = RpcHelper::new(
node_id.into(),
fullmesh,
layout_watch.clone(),
config.rpc_timeout_msec.map(Duration::from_millis),
);
Ok(Self {
replication_factor,
persist_cluster_layout,
layout_watch,
update_layout: Mutex::new(update_layout),
system_endpoint,
rpc_helper,
})
}
// ---- PUBLIC INTERFACE ----
pub async fn update_cluster_layout(&self, layout: &LayoutHistory) -> Result<(), Error> {
self.handle_advertise_cluster_layout(layout).await?;
Ok(())
}
pub fn history(&self) -> watch::Ref<Arc<LayoutHistory>> {
self.layout_watch.borrow()
}
pub(crate) async fn pull_cluster_layout(&self, peer: Uuid) {
let resp = self
.rpc_helper
.call(
&self.system_endpoint,
peer,
SystemRpc::PullClusterLayout,
RequestStrategy::with_priority(PRIO_HIGH),
)
.await;
if let Ok(SystemRpc::AdvertiseClusterLayout(layout)) = resp {
let _: Result<_, _> = self.handle_advertise_cluster_layout(&layout).await;
}
}
// ---- INTERNALS ---
/// Save network configuration to disc
async fn save_cluster_layout(&self) -> Result<(), Error> {
let layout: Arc<LayoutHistory> = self.layout_watch.borrow().clone();
self.persist_cluster_layout
.save_async(&layout)
.await
.expect("Cannot save current cluster layout");
Ok(())
}
// ---- RPC HANDLERS ----
pub(crate) fn handle_pull_cluster_layout(&self) -> SystemRpc {
let layout = self.layout_watch.borrow().as_ref().clone();
SystemRpc::AdvertiseClusterLayout(layout)
}
pub(crate) async fn handle_advertise_cluster_layout(
&self,
adv: &LayoutHistory,
) -> Result<SystemRpc, Error> {
if adv.current().replication_factor != self.replication_factor {
let msg = format!(
"Received a cluster layout from another node with replication factor {}, which is different from what we have in our configuration ({}). Discarding the cluster layout we received.",
adv.current().replication_factor,
self.replication_factor
);
error!("{}", msg);
return Err(Error::Message(msg));
}
let update_layout = self.update_layout.lock().await;
// TODO: don't clone each time an AdvertiseClusterLayout is received
let mut layout: LayoutHistory = self.layout_watch.borrow().as_ref().clone();
let prev_layout_check = layout.check().is_ok();
if layout.merge(adv) {
if prev_layout_check && layout.check().is_err() {
error!("New cluster layout is invalid, discarding.");
return Err(Error::Message(
"New cluster layout is invalid, discarding.".into(),
));
}
update_layout.send(Arc::new(layout.clone()))?;
drop(update_layout);
/* TODO
tokio::spawn(async move {
if let Err(e) = system
.rpc_helper()
.broadcast(
&system.system_endpoint,
SystemRpc::AdvertiseClusterLayout(layout),
RequestStrategy::with_priority(PRIO_HIGH),
)
.await
{
warn!("Error while broadcasting new cluster layout: {}", e);
}
});
*/
self.save_cluster_layout().await?;
}
Ok(SystemRpc::Ok)
}
}
|
