make building the example optional

Cargo.toml

@@ -9,20 +9,34 @@ crate-type = ["rlib", "cdylib"]
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-boxcar = "0.2.5"
+boxcar = { version = "0.2.5", optional = true }
 ctor = { version = "0.2.8", optional = true }
-filetime = "0.2.24"
+filetime = { version = "0.2.24", optional = true }
-ipnet = { version = "2.9.0", features = ["serde"] }
+ipnet = { version = "2.9.0", features = ["serde"], optional = true }
-iptrie = "0.8.5"
+iptrie = { version = "0.8.5", optional = true }
-libc = "0.2.155"
+libc = { version = "0.2.155", optional = true }
-mnl = { version = "0.2.2", features = ["mnl-1-0-4"] }
+mnl = { version = "0.2.2", features = ["mnl-1-0-4"], optional = true }
-nftnl = { version = "0.6.2", features = ["nftnl-1-1-2"] }
+nftnl = { version = "0.6.2", features = ["nftnl-1-1-2"], optional = true }
-nix = { version = "0.29.0", features = ["poll", "user"] }
+nix = { version = "0.29.0", features = ["poll", "user"], optional = true }
-radix_trie = "0.2.1"
+radix_trie = { version = "0.2.1", optional = true }
-serde = { version = "1.0.205", features = ["derive"] }
+serde = { version = "1.0.205", features = ["derive"], optional = true }
-serde_json = "1.0.122"
+serde_json = { version = "1.0.122", optional = true }
-smallvec = "1.13.2"
+smallvec = { version = "1.13.2", optional = true }
 
 [features]
-example = ["ctor"]
+example = [
+	"boxcar",
+	"ctor",
+	"filetime",
+	"ipnet",
+	"iptrie",
+	"libc",
+	"mnl",
+	"nftnl",
+	"nix",
+	"radix_trie",
+	"serde",
+	"serde_json",
+	"smallvec",
+]
 default = ["example"]

src/example/mod.rs

@@ -22,15 +22,23 @@ use serde::{
 use smallvec::SmallVec;
 
 use crate::{
-    domain_tree::PrefixSet,
-    nftables::{nftables_thread, NftData},
     unbound::{rr_class, rr_type, ModuleEvent, ModuleExtState, ReplyInfo},
     UnboundMod,
 };
+use domain_tree::PrefixSet;
+use nftables::{nftables_thread, NftData};
+
+mod domain_tree;
+mod nftables;
 
 type Domain = SmallVec<[u8; 32]>;
 type DomainSeg = SmallVec<[u8; 16]>;
 
+#[ctor]
+fn setup() {
+    crate::set_unbound_mod::<ExampleMod>();
+}
+
 struct IpNetDeser(IpNet);
 struct IpNetVisitor;
 impl<'de> Visitor<'de> for IpNetVisitor {
@@ -738,11 +746,6 @@ impl UnboundMod for ExampleMod {
     }
 }
 
-#[ctor]
-fn setup() {
-    crate::set_unbound_mod::<ExampleMod>();
-}
-
 #[cfg(test)]
 mod test {
     use std::{net::Ipv4Addr, os::unix::fs::MetadataExt, path::PathBuf, str::FromStr, sync::mpsc};

src/example/nftables.rs

@@ -471,7 +471,7 @@ pub(crate) fn nftables_thread(
         }
     }
     let socket = mnl::Socket::new(mnl::Bus::Netfilter).unwrap();
-    let all_sets = crate::nftables::get_sets(&socket).unwrap();
+    let all_sets = get_sets(&socket).unwrap();
     for set in all_sets {
         for ruleset in &mut rulesets {
             if set.table_name_str() == Some("global") && set.family() == libc::NFPROTO_INET as u32 {
@@ -531,9 +531,7 @@ mod test {
     use ipnet::{Ipv4Net, Ipv6Net};
     use iptrie::RTrieSet;
 
-    use crate::nftables::{iter_ip_trie, should_add};
+    use super::{get_sets, iter_ip_trie, should_add};
-
-    use super::get_sets;
 
     #[test]
     fn test_nftables() {

src/lib.rs

@@ -15,11 +15,9 @@ use unbound::ModuleExtState;
 )]
 mod bindings;
 mod combine;
-mod domain_tree;
 #[cfg(feature = "example")]
 mod example;
 mod exports;
-mod nftables;
 mod unbound;
 
 pub trait UnboundMod: Send + Sync + Sized + RefUnwindSafe + UnwindSafe {

src/nftables_lib.rs

@@ -1,15 +0,0 @@
-fn run<T: ToString>(
-    family: &str,
-    table: &str,
-    set: &str,
-    flush: bool,
-    items: impl IntoIterator<T>,
-) {
-    let nft = libnftables1_sys::Nftables::new();
-    let mut cmd = String::new();
-    if flush {
-        cmd.push_str(&format!("flush set {family} {table} {set}"));
-        nft.run_cmd(c)
-    }
-    nft.set_numeric_time
-}