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use std::collections::HashMap;
use anyhow::Result;
use log::*;
use serde::{Deserialize, Serialize};
// ---- Watch and retrieve Consul catalog ----
#[derive(Serialize, Deserialize, Debug)]
pub struct ConsulServiceEntry {
#[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 = "Services")]
pub services: HashMap<String, ConsulServiceEntry>,
}
#[derive(Clone)]
pub struct Consul {
client: reqwest::Client,
url: String,
idx: Option<u64>,
}
impl Consul {
pub fn new(url: &str) -> Self {
return Self {
client: reqwest::Client::new(),
url: url.to_string(),
idx: None,
};
}
pub fn watch_node_reset(&mut self) -> () {
self.idx = None;
}
pub async fn watch_node(&mut self, host: &str) -> Result<ConsulNodeCatalog> {
let url = match self.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?;
self.idx = match http.headers().get("X-Consul-Index") {
Some(v) => Some(v.to_str()?.parse::<u64>()?),
None => return Err(anyhow!("X-Consul-Index header not found")),
};
let resp: ConsulNodeCatalog = http.json().await?;
return Ok(resp);
}
}
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