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
|
use std::collections::HashMap;
use anyhow::Result;
use bytes::Bytes;
use log::*;
use reqwest::StatusCode;
use serde::{Deserialize, Serialize};
// ---- Watch and retrieve Consul catalog ----
//
#[derive(Serialize, Deserialize, Debug)]
pub struct ConsulNode {
#[serde(rename = "Node")]
pub node: String,
#[serde(rename = "Address")]
pub address: String,
}
#[derive(Serialize, Deserialize, Debug)]
pub struct ConsulServiceEntry {
#[serde(rename = "Service")]
pub service: String,
#[serde(rename = "Address")]
pub address: String,
#[serde(rename = "Port")]
pub port: u16,
#[serde(rename = "Tags")]
pub tags: Vec<String>,
}
#[derive(Serialize, Deserialize, Debug)]
pub struct ConsulNodeCatalog {
#[serde(rename = "Node")]
pub node: ConsulNode,
#[serde(rename = "Services")]
pub services: HashMap<String, ConsulServiceEntry>,
}
// ---- Consul session management ----
#[derive(Serialize, Deserialize, Debug)]
pub struct ConsulSessionRequest {
#[serde(rename = "Name")]
pub name: String,
#[serde(rename = "Node")]
pub node: Option<String>,
#[serde(rename = "LockDelay")]
pub lock_delay: Option<String>,
#[serde(rename = "TTL")]
pub ttl: Option<String>,
#[serde(rename = "Behavior")]
pub behavior: Option<String>,
}
#[derive(Serialize, Deserialize, Debug)]
pub struct ConsulSessionResponse {
#[serde(rename = "ID")]
pub id: String,
}
#[derive(Clone)]
pub struct Consul {
client: reqwest::Client,
url: String,
kv_prefix: String,
pub local_node: String,
}
impl Consul {
pub fn new(url: &str, kv_prefix: &str, local_node: &str) -> Self {
return Self {
client: reqwest::Client::new(),
url: url.trim_end_matches('/').to_string(),
kv_prefix: kv_prefix.to_string(),
local_node: local_node.into(),
};
}
pub async fn list_nodes(&self) -> Result<Vec<String>> {
debug!("list_nodes");
let url = format!("{}/v1/catalog/nodes", self.url);
let http = self.client.get(&url).send().await?;
let resp: Vec<ConsulNode> = http.json().await?;
Ok(resp.into_iter().map(|n| n.node).collect::<Vec<_>>())
}
pub async fn watch_node(
&self,
host: &str,
idx: Option<usize>,
) -> Result<(ConsulNodeCatalog, usize)> {
debug!("watch_node {} {:?}", host, idx);
let url = match idx {
Some(i) => format!("{}/v1/catalog/node/{}?index={}", self.url, host, i),
None => format!("{}/v1/catalog/node/{}", self.url, host),
};
let http = self.client.get(&url).send().await?;
let new_idx = match http.headers().get("X-Consul-Index") {
Some(v) => v.to_str()?.parse::<usize>()?,
None => bail!("X-Consul-Index header not found"),
};
let resp: ConsulNodeCatalog = http.json().await?;
Ok((resp, new_idx))
}
// ---- KV get and put ----
pub async fn kv_get(&self, key: &str) -> Result<Option<Bytes>> {
debug!("kv_get {}", key);
let url = format!("{}/v1/kv/{}{}?raw", self.url, self.kv_prefix, key);
let http = self.client.get(&url).send().await?;
match http.status() {
StatusCode::OK => Ok(Some(http.bytes().await?)),
StatusCode::NOT_FOUND => Ok(None),
_ => Err(anyhow!(
"Consul request failed: {:?}",
http.error_for_status()
)),
}
}
pub async fn kv_get_json<T: for<'de> Deserialize<'de>>(&self, key: &str) -> Result<Option<T>> {
debug!("kv_get_json {}", key);
let url = format!("{}/v1/kv/{}{}?raw", self.url, self.kv_prefix, key);
let http = self.client.get(&url).send().await?;
match http.status() {
StatusCode::OK => Ok(Some(http.json().await?)),
StatusCode::NOT_FOUND => Ok(None),
_ => Err(anyhow!(
"Consul request failed: {:?}",
http.error_for_status()
)),
}
}
pub async fn kv_put(&self, key: &str, bytes: Bytes) -> Result<()> {
debug!("kv_put {}", key);
let url = format!("{}/v1/kv/{}{}", self.url, self.kv_prefix, key);
let http = self.client.put(&url).body(bytes).send().await?;
http.error_for_status()?;
Ok(())
}
pub async fn kv_put_json<T: Serialize>(&self, key: &str, value: &T) -> Result<()> {
debug!("kv_put_json {}", key);
let url = format!("{}/v1/kv/{}{}", self.url, self.kv_prefix, key);
let http = self.client.put(&url).json(value).send().await?;
http.error_for_status()?;
Ok(())
}
pub async fn kv_delete(&self, key: &str) -> Result<()> {
let url = format!("{}/v1/kv/{}{}", self.url, self.kv_prefix, key);
let http = self.client.delete(&url).send().await?;
http.error_for_status()?;
Ok(())
}
// ---- Locking ----
pub async fn create_session(&self, req: &ConsulSessionRequest) -> Result<String> {
debug!("create_session {:?}", req);
let url = format!("{}/v1/session/create", self.url);
let http = self.client.put(&url).json(req).send().await?;
let resp: ConsulSessionResponse = http.json().await?;
Ok(resp.id)
}
pub async fn acquire(&self, key: &str, bytes: Bytes, session: &str) -> Result<bool> {
debug!("acquire {}", key);
let url = format!(
"{}/v1/kv/{}{}?acquire={}",
self.url, self.kv_prefix, key, session
);
let http = self.client.put(&url).body(bytes).send().await?;
let resp: bool = http.json().await?;
Ok(resp)
}
pub async fn release(&self, key: &str, bytes: Bytes, session: &str) -> Result<()> {
debug!("release {}", key);
let url = format!(
"{}/v1/kv/{}{}?release={}",
self.url, self.kv_prefix, key, session
);
let http = self.client.put(&url).body(bytes).send().await?;
http.error_for_status()?;
Ok(())
}
}
|
