1 files changed, 62 insertions, 0 deletions
diff --git a/src/consul.rs b/src/consul.rs
new file mode 100644
index 0000000..81074f4
--- /dev/null
+++ b/src/consul.rs
@@ -0,0 +1,62 @@
+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);
+	}
+}