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use std::collections::HashMap;
use std::fmt::Write;
use std::sync::Arc;
use std::time::Duration;
use anyhow::Result;
use futures::future::BoxFuture;
use futures::stream::futures_unordered::FuturesUnordered;
use futures::{FutureExt, StreamExt};
use log::*;
use serde::{Deserialize, Serialize};
use tokio::select;
use tokio::sync::watch;
use crate::{Consul, WithIndex};
#[derive(Serialize, Deserialize, Debug, Clone)]
#[serde(rename_all = "PascalCase")]
pub struct ConsulNode {
pub node: String,
pub address: String,
pub meta: HashMap<String, String>,
}
#[derive(Serialize, Deserialize, Debug, Clone)]
#[serde(rename_all = "PascalCase")]
pub struct ConsulService {
pub service: String,
pub address: String,
pub port: u16,
pub tags: Vec<String>,
}
#[derive(Serialize, Deserialize, Debug)]
#[serde(rename_all = "PascalCase")]
pub struct ConsulCatalogNode {
pub node: ConsulNode,
pub services: HashMap<String, ConsulService>,
}
pub type ConsulServiceList = HashMap<String, Vec<String>>;
#[derive(Serialize, Deserialize, Debug)]
#[serde(rename_all = "PascalCase")]
pub struct ConsulServiceNode {
pub node: String,
pub address: String,
pub node_meta: HashMap<String, String>,
pub service_name: String,
pub service_tags: Vec<String>,
pub service_address: String,
pub service_port: u16,
}
#[derive(Serialize, Deserialize, Debug, Clone)]
#[serde(rename_all = "PascalCase")]
pub struct ConsulHealthServiceNode {
pub node: ConsulNode,
pub service: ConsulService,
pub checks: Vec<ConsulHealthCheck>,
}
#[derive(Serialize, Deserialize, Debug, Clone)]
#[serde(rename_all = "PascalCase")]
pub struct ConsulHealthCheck {
pub node: String,
#[serde(rename = "CheckID")]
pub check_id: String,
pub name: String,
pub status: String,
pub output: String,
#[serde(rename = "Type")]
pub type_: String,
}
pub type AllServiceHealth = HashMap<String, Arc<[ConsulHealthServiceNode]>>;
impl Consul {
pub async fn catalog_node_list(
&self,
last_index: Option<usize>,
) -> Result<WithIndex<Vec<ConsulNode>>> {
self.get_with_index(format!("{}/v1/catalog/nodes", self.url), last_index)
.await
}
pub async fn catalog_node(
&self,
host: &str,
last_index: Option<usize>,
) -> Result<WithIndex<Option<ConsulCatalogNode>>> {
self.get_with_index(format!("{}/v1/catalog/node/{}", self.url, host), last_index)
.await
}
pub async fn catalog_service_list(
&self,
last_index: Option<usize>,
) -> Result<WithIndex<ConsulServiceList>> {
self.get_with_index::<ConsulServiceList>(
format!("{}/v1/catalog/services", self.url),
last_index,
)
.await
}
pub async fn catalog_service_nodes(
&self,
service: &str,
last_index: Option<usize>,
) -> Result<WithIndex<Vec<ConsulServiceNode>>> {
self.get_with_index(
format!("{}/v1/catalog/service/{}", self.url, service),
last_index,
)
.await
}
pub async fn health_service_instances(
&self,
service: &str,
last_index: Option<usize>,
) -> Result<WithIndex<Vec<ConsulHealthServiceNode>>> {
self.get_with_index(
format!("{}/v1/health/service/{}", self.url, service),
last_index,
)
.await
}
pub fn watch_all_service_health(&self) -> watch::Receiver<AllServiceHealth> {
let (tx, rx) = watch::channel(HashMap::new());
tokio::spawn(do_watch_all_service_health(self.clone(), tx));
rx
}
async fn get_with_index<T: for<'de> Deserialize<'de>>(
&self,
mut url: String,
last_index: Option<usize>,
) -> Result<WithIndex<T>> {
if let Some(i) = last_index {
if url.contains('?') {
write!(&mut url, "&index={}", i).unwrap();
} else {
write!(&mut url, "?index={}", i).unwrap();
}
}
debug!("GET {} as {}", url, std::any::type_name::<T>());
let http = self.client.get(&url).send().await?;
Ok(WithIndex::<T>::index_from(&http)?.value(http.json().await?))
}
}
async fn do_watch_all_service_health(consul: Consul, tx: watch::Sender<AllServiceHealth>) {
let mut services = AllServiceHealth::new();
let mut service_watchers = FuturesUnordered::<BoxFuture<(String, Result<_>)>>::new();
let mut service_list: BoxFuture<Result<_>> = Box::pin(consul.catalog_service_list(None));
loop {
select! {
list_res = &mut service_list => {
match list_res {
Ok(list) => {
let list_index = list.index();
for service in list.into_inner().keys() {
if !services.contains_key(service) {
services.insert(service.to_string(), Arc::new([]));
let service = service.to_string();
service_watchers.push(Box::pin(async {
let res = consul.health_service_instances(&service, None).await;
(service, res)
}));
}
}
service_list = Box::pin(consul.catalog_service_list(Some(list_index)));
}
Err(e) => {
warn!("Error listing services: {}", e);
service_list = Box::pin(async {
tokio::time::sleep(Duration::from_secs(30)).await;
consul.catalog_service_list(None).await
});
}
}
}
(service, watch_res) = service_watchers.next().then(some_or_pending) => {
match watch_res {
Ok(nodes) => {
let index = nodes.index();
services.insert(service.clone(), nodes.into_inner().into());
let consul = &consul;
service_watchers.push(Box::pin(async move {
let res = consul.health_service_instances(&service, Some(index)).await;
(service, res)
}));
if tx.send(services.clone()).is_err() {
break;
}
}
Err(e) => {
warn!("Error getting service {}: {}", service, e);
service_watchers.push(Box::pin(async {
tokio::time::sleep(Duration::from_secs(30)).await;
let res = consul.health_service_instances(&service, None).await;
(service, res)
}));
}
}
}
_ = tx.closed() => {
break;
}
}
}
}
async fn some_or_pending<T>(value: Option<T>) -> T {
match value {
Some(v) => v,
None => futures::future::pending().await,
}
}
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