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use std::collections::HashMap;
use std::fs::File;
use std::io::Read;
use std::net::{IpAddr, SocketAddr};
use err_derive::Error;
use serde::{Deserialize, Serialize};
use netapp::NodeID;
use garage_util::config::ConsulServiceConfig;
const META_PREFIX: &str = "fr-deuxfleurs-garagehq";
#[derive(Deserialize, Clone, Debug)]
struct ConsulQueryEntry {
#[serde(rename = "Address")]
address: String,
#[serde(rename = "ServicePort")]
service_port: u16,
#[serde(rename = "ServiceMeta")]
service_meta: HashMap<String, String>,
}
#[derive(Serialize, Clone, Debug)]
struct ConsulPublishService {
#[serde(rename = "ID")]
service_id: String,
#[serde(rename = "Name")]
service_name: String,
#[serde(rename = "Tags")]
tags: Vec<String>,
#[serde(rename = "Address")]
address: IpAddr,
#[serde(rename = "Port")]
port: u16,
#[serde(rename = "Meta")]
meta: HashMap<String, String>,
}
// ----
pub struct ConsulServiceDiscovery {
config: ConsulServiceConfig,
client: reqwest::Client,
}
impl ConsulServiceDiscovery {
pub fn new(config: ConsulServiceConfig) -> Result<Self, ConsulError> {
let mut builder: reqwest::ClientBuilder = match &config.ca_cert {
Some(client_ca) => {
let mut ca_cert_buf = vec![];
File::open(client_ca)?.read_to_end(&mut ca_cert_buf)?;
let req: reqwest::ClientBuilder = reqwest::Client::builder()
.add_root_certificate(reqwest::Certificate::from_pem(&ca_cert_buf[..])?)
.use_rustls_tls();
if config.tls_skip_verify {
req.danger_accept_invalid_certs(true)
} else {
req
}
}
None => reqwest::Client::builder(),
};
if let Some(token) = &config.consul_http_token {
let mut headers = reqwest::header::HeaderMap::new();
headers.insert("x-consul-token", reqwest::header::HeaderValue::from_str(&token)?);
builder = builder.default_headers(headers);
}
let client = builder.build()?;
Ok(Self { client, config })
}
// ---- READING FROM CONSUL CATALOG ----
pub async fn get_consul_services(&self) -> Result<Vec<(NodeID, SocketAddr)>, ConsulError> {
let url = format!(
"{}/v1/catalog/service/{}",
self.config.consul_http_addr, self.config.service_name
);
let req = self.client.get(&url);
let http = req.send().await?;
let entries: Vec<ConsulQueryEntry> = http.json().await?;
let mut ret = vec![];
for ent in entries {
let ip = ent.address.parse::<IpAddr>().ok();
let pubkey = ent
.service_meta
.get(&format!("{}-pubkey", META_PREFIX))
.and_then(|k| hex::decode(k).ok())
.and_then(|k| NodeID::from_slice(&k[..]));
if let (Some(ip), Some(pubkey)) = (ip, pubkey) {
ret.push((pubkey, SocketAddr::new(ip, ent.service_port)));
} else {
warn!(
"Could not process node spec from Consul: {:?} (invalid IP or public key)",
ent
);
}
}
debug!("Got nodes from Consul: {:?}", ret);
Ok(ret)
}
// ---- PUBLISHING TO CONSUL CATALOG ----
pub async fn publish_consul_service(
&self,
node_id: NodeID,
hostname: &str,
rpc_public_addr: SocketAddr,
) -> Result<(), ConsulError> {
let node = format!("garage:{}", hex::encode(&node_id[..8]));
let tags = [
vec!["advertised-by-garage".into(), hostname.into()],
self.config.tags.clone(),
]
.concat();
let advertisement: ConsulPublishService = ConsulPublishService {
service_id: node.clone(),
service_name: self.config.service_name.clone(),
tags,
meta: [
(format!("{}-pubkey", META_PREFIX), hex::encode(node_id)),
(format!("{}-hostname", META_PREFIX), hostname.to_string()),
]
.iter()
.cloned()
.collect(),
address: rpc_public_addr.ip(),
port: rpc_public_addr.port(),
};
let url = format!(
"{}/v1/agent/service/register?replace-existing-checks",
self.config.consul_http_addr
);
let req = self.client.put(&url);
let http = req.json(&advertisement).send().await?;
http.error_for_status()?;
Ok(())
}
}
/// Regroup all Consul discovery errors
#[derive(Debug, Error)]
pub enum ConsulError {
#[error(display = "IO error: {}", _0)]
Io(#[error(source)] std::io::Error),
#[error(display = "HTTP error: {}", _0)]
Reqwest(#[error(source)] reqwest::Error),
#[error(display = "Invalid HTTP header error: {}", _0)]
HeaderValue(#[error(source)] reqwest::header::InvalidHeaderValue),
}
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