feat: support domain name as the ceresdb node addr (#852)

* feat: support domain name as the ceresdb node addr

* chore: remove unused imports

Author: ShiKaiWi

src/bin/ceresdb-server.rs

@@ -1,8 +1,8 @@
-// Copyright 2022 CeresDB Project Authors. Licensed under Apache-2.0.
+// Copyright 2022-2023 CeresDB Project Authors. Licensed under Apache-2.0.
 
 //! The main entry point to start the server
 
-use std::{env, net::IpAddr};
+use std::env;
 
 use ceresdb::{
     config::{ClusterDeployment, Config},
@@ -12,8 +12,11 @@ use clap::{App, Arg};
 use common_util::{panic, toml};
 use log::info;
 
-/// The ip address of current node.
+/// By this environment variable, the address of current node can be overridden.
+/// And it could be domain name or ip address, but no port follows it.
 const NODE_ADDR: &str = "CERESDB_SERVER_ADDR";
+/// By this environment variable, the cluster name of current node can be
+/// overridden.
 const CLUSTER_NAME: &str = "CLUSTER_NAME";
 
 fn fetch_version() -> String {
@@ -36,14 +39,6 @@ fn fetch_version() -> String {
     .join("\n")
 }
 
-// Parse the raw addr and panic if it is invalid.
-fn parse_node_addr_or_fail(raw_addr: &str) -> IpAddr {
-    let socket_addr: IpAddr = raw_addr
-        .parse()
-        .unwrap_or_else(|_| panic!("invalid node addr, raw_addr:{raw_addr}"));
-    socket_addr
-}
-
 fn main() {
     let version = fetch_version();
     let matches = App::new("CeresDB Server")
@@ -67,8 +62,7 @@ fn main() {
     };
 
     if let Ok(node_addr) = env::var(NODE_ADDR) {
-        let ip = parse_node_addr_or_fail(&node_addr);
-        config.node.addr = ip.to_string();
+        config.node.addr = node_addr;
     }
     if let Ok(cluster) = env::var(CLUSTER_NAME) {
         if let Some(ClusterDeployment::WithMeta(v)) = &mut config.cluster_deployment {

src/config.rs

@@ -12,6 +12,8 @@ use server::{
 #[derive(Clone, Debug, Deserialize, Serialize)]
 #[serde(default)]
 pub struct NodeInfo {
+    /// The address of the ceresdb node. It can be a domain name or an IP
+    /// address without port followed.
     pub addr: String,
     pub zone: String,
     pub idc: String,