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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::ConsulDiscoveryConfig;
#[derive(Deserialize, Clone, Debug)]
struct ConsulQueryEntry {
#[serde(rename = "Address")]
address: String,
#[serde(rename = "ServicePort")]
service_port: u16,
#[serde(rename = "NodeMeta")]
node_meta: HashMap<String, String>,
}
#[derive(Serialize, Clone, Debug)]
struct ConsulPublishEntry {
#[serde(rename = "Node")]
node: String,
#[serde(rename = "Address")]
address: IpAddr,
#[serde(rename = "NodeMeta")]
node_meta: HashMap<String, String>,
#[serde(rename = "Service")]
service: ConsulPublishService,
}
#[derive(Serialize, Clone, Debug)]
struct ConsulPublishService {
#[serde(rename = "ID")]
service_id: String,
#[serde(rename = "Service")]
service_name: String,
#[serde(rename = "Tags")]
tags: Vec<String>,
#[serde(rename = "Address")]
address: IpAddr,
#[serde(rename = "Port")]
port: u16,
}
// ----
pub struct ConsulDiscovery {
config: ConsulDiscoveryConfig,
client: reqwest::Client,
}
impl ConsulDiscovery {
pub fn new(config: ConsulDiscoveryConfig) -> Result<Self, ConsulError> {
let client = match (&config.client_cert, &config.client_key) {
(Some(client_cert), Some(client_key)) => {
let mut client_cert_buf = vec![];
File::open(client_cert)?.read_to_end(&mut client_cert_buf)?;
let mut client_key_buf = vec![];
File::open(client_key)?.read_to_end(&mut client_key_buf)?;
let identity = reqwest::Identity::from_pem(
&[&client_cert_buf[..], &client_key_buf[..]].concat()[..],
)?;
if config.tls_skip_verify {
reqwest::Client::builder()
.use_rustls_tls()
.danger_accept_invalid_certs(true)
.identity(identity)
.build()?
} else if let Some(ca_cert) = &config.ca_cert {
let mut ca_cert_buf = vec![];
File::open(ca_cert)?.read_to_end(&mut ca_cert_buf)?;
reqwest::Client::builder()
.use_rustls_tls()
.add_root_certificate(reqwest::Certificate::from_pem(&ca_cert_buf[..])?)
.identity(identity)
.build()?
} else {
reqwest::Client::builder()
.use_rustls_tls()
.identity(identity)
.build()?
}
}
(None, None) => reqwest::Client::new(),
_ => return Err(ConsulError::InvalidTLSConfig),
};
Ok(Self { client, config })
}
// ---- READING FROM CONSUL CATALOG ----
pub async fn get_consul_nodes(&self) -> Result<Vec<(NodeID, SocketAddr)>, ConsulError> {
let url = format!(
"http://{}/v1/catalog/service/{}",
self.config.consul_host, self.config.service_name
);
let http = self.client.get(&url).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
.node_meta
.get("pubkey")
.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 advertisement = ConsulPublishEntry {
node: node.clone(),
address: rpc_public_addr.ip(),
node_meta: [
("pubkey".to_string(), hex::encode(node_id)),
("hostname".to_string(), hostname.to_string()),
]
.iter()
.cloned()
.collect(),
service: ConsulPublishService {
service_id: node.clone(),
service_name: self.config.service_name.clone(),
tags: vec!["advertised-by-garage".into(), hostname.into()],
address: rpc_public_addr.ip(),
port: rpc_public_addr.port(),
},
};
let url = format!("http://{}/v1/catalog/register", self.config.consul_host);
let http = self.client.put(&url).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 Consul TLS configuration")]
InvalidTLSConfig,
}
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