Merge branch 'main' into healthcheck

applied hot reload to health check logic
Merge pull request #4 from psun256/tests/adaptive_weights
2025-12-10 18:59:20 -05:00 · 2025-12-10 18:58:47 -05:00 · 2025-12-10 18:29:37 -05:00 · 2025-12-10 18:26:52 -05:00 · 2025-12-10 18:08:54 -05:00 · 2025-12-10 17:25:16 -05:00
14 changed files with 837 additions and 77 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -9,12 +9,30 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5a15f179cd60c4584b8a8c596927aadc462e27f2ca70c04e0071964a73ba7a75"
 dependencies = [
 "cfg-if",
- "getrandom",
+ "getrandom 0.3.4",
 "once_cell",
 "version_check",
 "zerocopy",
 ]

+[[package]]
+name = "aho-corasick"
+version = "1.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ddd31a130427c27518df266943a5308ed92d4b226cc639f5a8f1002816174301"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "anstream"
 version = "0.6.21"
@@ -65,6 +83,12 @@ dependencies = [
 "windows-sys 0.61.2",
 ]

+[[package]]
+name = "anyhow"
+version = "1.0.100"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a23eb6b1614318a8071c9b2521f36b424b2c83db5eb3a0fead4a6c0809af6e61"
+
 [[package]]
 name = "anywho"
 version = "0.1.2"
@@ -107,12 +131,34 @@ version = "2.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "812e12b5285cc515a9c72a5c1d3b6d46a19dac5acfef5265968c166106e31dd3"

+[[package]]
+name = "bumpalo"
+version = "3.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "46c5e41b57b8bba42a04676d81cb89e9ee8e859a1a66f80a5a72e1cb76b34d43"
+
+[[package]]
+name = "byteorder"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
+
 [[package]]
 name = "bytes"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b35204fbdc0b3f4446b89fc1ac2cf84a8a68971995d0bf2e925ec7cd960f9cb3"

+[[package]]
+name = "cc"
+version = "1.2.49"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "90583009037521a116abf44494efecd645ba48b6622457080f080b85544e2215"
+dependencies = [
+ "find-msvc-tools",
+ "shlex",
+]
+
 [[package]]
 name = "cfg-if"
 version = "1.0.4"
@@ -127,7 +173,20 @@ checksum = "99cbf41c6ec3c4b9eaf7f8f5c11a72cd7d3aa0428125c20d5ef4d09907a0f019"
 dependencies = [
 "cfg-if",
 "cpufeatures",
- "rand_core",
+ "rand_core 0.10.0-rc-2",
+]
+
+[[package]]
+name = "chrono"
+version = "0.4.42"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "145052bdd345b87320e369255277e3fb5152762ad123a901ef5c262dd38fe8d2"
+dependencies = [
+ "iana-time-zone",
+ "js-sys",
+ "num-traits",
+ "wasm-bindgen",
+ "windows-link",
 ]

 [[package]]
@@ -182,6 +241,12 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b05b61dc5112cbb17e4b6cd61790d9845d13888356391624cbe7e41efeac1e75"

+[[package]]
+name = "core-foundation-sys"
+version = "0.8.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
+
 [[package]]
 name = "cpufeatures"
 version = "0.2.17"
@@ -209,6 +274,35 @@ dependencies = [
 "encoding_rs",
 ]

+[[package]]
+name = "env_filter"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1bf3c259d255ca70051b30e2e95b5446cdb8949ac4cd22c0d7fd634d89f568e2"
+dependencies = [
+ "log",
+ "regex",
+]
+
+[[package]]
+name = "env_logger"
+version = "0.11.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "13c863f0904021b108aa8b2f55046443e6b1ebde8fd4a15c399893aae4fa069f"
+dependencies = [
+ "anstream",
+ "anstyle",
+ "env_filter",
+ "jiff",
+ "log",
+]
+
+[[package]]
+name = "find-msvc-tools"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3a3076410a55c90011c298b04d0cfa770b00fa04e1e3c97d3f6c9de105a03844"
+
 [[package]]
 name = "foldhash"
 version = "0.1.5"
@@ -224,6 +318,17 @@ dependencies = [
 "libc",
 ]

+[[package]]
+name = "getrandom"
+version = "0.2.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "335ff9f135e4384c8150d6f27c6daed433577f86b4750418338c01a1a2528592"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
 [[package]]
 name = "getrandom"
 version = "0.3.4"
@@ -260,6 +365,41 @@ version = "0.5.0"
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 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"

+[[package]]
+name = "hostname"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c731c3e10504cc8ed35cfe2f1db4c9274c3d35fa486e3b31df46f068ef3e867"
+dependencies = [
+ "libc",
+ "match_cfg",
+ "winapi",
+]
+
+[[package]]
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+version = "0.1.64"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "33e57f83510bb73707521ebaffa789ec8caf86f9657cad665b092b581d40e9fb"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "iana-time-zone-haiku",
+ "js-sys",
+ "log",
+ "wasm-bindgen",
+ "windows-core",
+]
+
+[[package]]
+name = "iana-time-zone-haiku"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f31827a206f56af32e590ba56d5d2d085f558508192593743f16b2306495269f"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "inotify"
 version = "0.11.0"
@@ -292,6 +432,40 @@ version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4a5f13b858c8d314ee3e8f639011f7ccefe71f97f96e50151fb991f267928e2c"

+[[package]]
+name = "jiff"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49cce2b81f2098e7e3efc35bc2e0a6b7abec9d34128283d7a26fa8f32a6dbb35"
+dependencies = [
+ "jiff-static",
+ "log",
+ "portable-atomic",
+ "portable-atomic-util",
+ "serde_core",
+]
+
+[[package]]
+name = "jiff-static"
+version = "0.2.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "980af8b43c3ad5d8d349ace167ec8170839f753a42d233ba19e08afe1850fa69"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
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+version = "0.3.83"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "464a3709c7f55f1f721e5389aa6ea4e3bc6aba669353300af094b29ffbdde1d8"
+dependencies = [
+ "once_cell",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "kqueue"
 version = "1.1.1"
@@ -321,17 +495,19 @@ dependencies = [
 "cidr",
 "clap",
 "notify",
- "rand",
+ "rand 0.10.0-rc.5",
+ "rperf3-rs",
 "serde",
 "serde-saphyr",
+ "serde_json",
 "tokio",
 ]

 [[package]]
 name = "libc"
-version = "0.2.177"
+version = "0.2.178"
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-checksum = "2874a2af47a2325c2001a6e6fad9b16a53b802102b528163885171cf92b15976"
+checksum = "37c93d8daa9d8a012fd8ab92f088405fb202ea0b6ab73ee2482ae66af4f42091"

 [[package]]
 name = "lock_api"
@@ -348,6 +524,12 @@ version = "0.4.29"
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 checksum = "5e5032e24019045c762d3c0f28f5b6b8bbf38563a65908389bf7978758920897"

+[[package]]
+name = "match_cfg"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ffbee8634e0d45d258acb448e7eaab3fce7a0a467395d4d9f228e3c1f01fb2e4"
+
 [[package]]
 name = "memchr"
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@@ -356,9 +538,9 @@ checksum = "f52b00d39961fc5b2736ea853c9cc86238e165017a493d1d5c8eac6bdc4cc273"

 [[package]]
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-version = "1.1.0"
+version = "1.1.1"
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-checksum = "69d83b0086dc8ecf3ce9ae2874b2d1290252e2a30720bea58a5c6639b0092873"
+checksum = "a69bcab0ad47271a0234d9422b131806bf3968021e5dc9328caf2d4cd58557fc"
 dependencies = [
 "libc",
 "log",
@@ -446,6 +628,30 @@ version = "0.2.16"
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 checksum = "3b3cff922bd51709b605d9ead9aa71031d81447142d828eb4a6eba76fe619f9b"

+[[package]]
+name = "portable-atomic"
+version = "1.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f84267b20a16ea918e43c6a88433c2d54fa145c92a811b5b047ccbe153674483"
+
+[[package]]
+name = "portable-atomic-util"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d8a2f0d8d040d7848a709caf78912debcc3f33ee4b3cac47d73d1e1069e83507"
+dependencies = [
+ "portable-atomic",
+]
+
+[[package]]
+name = "ppv-lite86"
+version = "0.2.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85eae3c4ed2f50dcfe72643da4befc30deadb458a9b590d720cde2f2b1e97da9"
+dependencies = [
+ "zerocopy",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.103"
@@ -470,6 +676,17 @@ version = "5.3.0"
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 checksum = "69cdb34c158ceb288df11e18b4bd39de994f6657d83847bdffdbd7f346754b0f"

+[[package]]
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+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core 0.6.4",
+]
+
 [[package]]
 name = "rand"
 version = "0.10.0-rc.5"
@@ -477,8 +694,27 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "be866deebbade98028b705499827ad6967c8bb1e21f96a2609913c8c076e9307"
 dependencies = [
 "chacha20",
- "getrandom",
- "rand_core",
+ "getrandom 0.3.4",
+ "rand_core 0.10.0-rc-2",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
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+dependencies = [
+ "getrandom 0.2.16",
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 [[package]]
@@ -496,6 +732,63 @@ dependencies = [
 "bitflags 2.10.0",
 ]

+[[package]]
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+version = "1.12.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
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+ "memchr",
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+ "regex-syntax",
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+dependencies = [
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+ "hostname",
+ "libc",
+ "log",
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+ "rand 0.8.5",
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+ "tokio",
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+
 [[package]]
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@@ -589,10 +882,16 @@ dependencies = [
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 [[package]]
-name = "signal-hook-registry"
-version = "1.4.6"
+name = "shlex"
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@@ -627,15 +926,35 @@ checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"

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 "quote",
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+dependencies = [
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+ "quote",
+ "syn",
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+
 [[package]]
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@@ -707,6 +1026,67 @@ dependencies = [
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+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
 [[package]]
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 version = "0.1.11"
@@ -716,12 +1096,71 @@ dependencies = [
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 ]

+[[package]]
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+[[package]]
+name = "windows-interface"
+version = "0.59.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f316c4a2570ba26bbec722032c4099d8c8bc095efccdc15688708623367e358"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "windows-link"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"

+[[package]]
+name = "windows-result"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7781fa89eaf60850ac3d2da7af8e5242a5ea78d1a11c49bf2910bb5a73853eb5"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "windows-strings"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7837d08f69c77cf6b07689544538e017c1bfcf57e34b4c0ff58e6c2cd3b37091"
+dependencies = [
+ "windows-link",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.60.2"
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,6 +8,8 @@ anywho = "0.1.2"
 tokio = { version = "1.48.0", features = ["full"] }
 rand = "0.10.0-rc.5"
 serde = { version = "1.0.228", features = ["derive"] }
+serde_json = "1.0.145"
+rperf3-rs = "0.3.9"
 cidr = "0.3.1"
 serde-saphyr = "0.0.10"
 arc-swap = "1.7.1"
--- a/1
+++ b/1
@@ -36,4 +36,5 @@ FROM alpine:latest AS runtime
 # RUN apk add --no-cache ca-certificates curl netcat-openbsd bind-tools strace
 WORKDIR /enginewhy
 COPY --from=builder /enginewhy/target/x86_64-unknown-linux-musl/release/l4lb /usr/bin/l4lb
+COPY config.yaml .
 ENTRYPOINT ["l4lb"]
--- a/config.yaml
+++ b/config.yaml
@@ -1,3 +1,7 @@
+healthcheck_addr: "127.0.0.1:9000"
+
+iperf_addr: "0.0.0.0:5200"
+
 backends:
  - id: "srv-1"
    ip: "127.0.0.1"
@@ -16,7 +20,7 @@ clusters:

 rules:
  - clients:
-      - "0.0.0.0/0:8080"
+      - "0.0.0.0/0:8888"
    targets:
      - "main-api"
    strategy:
@@ -24,6 +28,7 @@ rules:

  - clients:
      - "0.0.0.0/0:6767"
+      - "0.0.0.0/0:6969"
    targets: # no issues with duplicate servers or clusters
      - "priority-api"
      - "priority-api"
--- a/infra/enginewhy-server.rs
+++ b/infra/enginewhy-server.rs
@@ -146,20 +146,14 @@ async fn main() -> std::io::Result<()> {
        }
        println!();

-        // Identify this process (client) by the local socket address used to connect
-        let server_identifier = match stream.local_addr() {
-            Ok(addr) => addr.to_string(),
-            Err(_) => format!("localhost:{}", PORT),
-        };
-
        let mut packet: HashMap<String, Value> = HashMap::new();
-        packet.insert("server_ip".to_string(), Value::String(server_identifier));
        packet.insert("cpu".to_string(), Value::from(cpu_usage));    // %
        packet.insert("mem".to_string(), Value::from(mem_usage));    // %
        packet.insert("net".to_string(), Value::from(net_usage_pct));
        packet.insert("io".to_string(), Value::from(io_usage));

        let serialized_packet = serde_json::to_string(&packet)?;
+        serialized_packet.push('\n');
        let _ = stream.write(serialized_packet.as_bytes());

        thread::sleep(Duration::from_secs(10));
--- a/src/backend/health.rs
+++ b/src/backend/health.rs
@@ -1 +1,134 @@
+use std::collections::HashMap;
+use std::net::{IpAddr, SocketAddr};
+use std::sync::{Arc, RwLock};
+use serde_json::Value;
+use rperf3::{Config, Server};
+use tokio::net::{TcpListener, TcpSocket, TcpStream};
+use tokio::io::AsyncBufReadExt;

+// Physical server health statistics, used for certain load balancing algorithms
+#[derive(Debug, Default)]
+pub struct ServerMetrics {
+    pub cpu: f64,
+    pub mem: f64,
+    pub net: f64,
+    pub io: f64,
+}
+
+impl ServerMetrics {
+    pub fn update(&mut self, cpu: f64, mem: f64, net: f64, io: f64) {
+        self.cpu = cpu;
+        self.mem = mem;
+        self.net = net;
+        self.io = io;
+    }
+}
+
+pub async fn start_healthcheck_listener(
+    addr: &str,
+    healths: HashMap<IpAddr, Arc<RwLock<ServerMetrics>>>,
+) -> std::io::Result<()> {
+    let addrs = tokio::net::lookup_host(addr).await?;
+    let mut listener = None;
+
+    for a in addrs {
+        let socket = match a {
+            SocketAddr::V4(_) => TcpSocket::new_v4()?,
+            SocketAddr::V6(_) => TcpSocket::new_v6()?,
+        };
+
+        socket.set_reuseaddr(true)?;
+
+        if socket.bind(a).is_ok() {
+            listener = Some(socket.listen(1024)?);
+            break;
+        }
+    }
+
+    let listener = listener.ok_or_else(|| {
+        eprintln!("health listener could not bind to port");
+        std::io::Error::new(std::io::ErrorKind::Other, "health listener failed")
+    })?;
+
+    println!("healthcheck server listening on {}", addr);
+    loop {
+        let (stream, remote_addr) = match listener.accept().await {
+            Ok(v) => v,
+            Err(e) => {
+                continue;
+            }
+        };
+
+        if let Err(e) = handle_metrics_stream(stream, &healths).await {
+            eprintln!("connection handler error: {}", e);
+        }
+    }
+}
+
+pub async fn start_iperf_server(addr: &str) -> Result<(), Box<dyn std::error::Error>> {
+    let sock = addr.parse::<SocketAddr>()?;
+    let mut config = Config::server(sock.port());
+    config.bind_addr = Some(sock.ip());
+    let server = Server::new(config);
+    println!("iperf server listening on {}", addr);
+    server.run().await?;
+    Ok(())
+}
+
+async fn handle_metrics_stream(
+    stream: TcpStream,
+    healths: &HashMap<IpAddr, Arc<RwLock<ServerMetrics>>>,
+) -> std::io::Result<()> {
+    let server_ip = stream.peer_addr()?.ip();
+    let mut reader = tokio::io::BufReader::new(stream);
+    let mut line = String::new();
+
+    loop {
+        line.clear();
+
+        match reader.read_line(&mut line).await {
+            Ok(0) => break,
+            Ok(_) => {
+                if let Err(e) = process_metrics(server_ip, &line, healths) {
+                    eprintln!("skipping invalid packet: {}", e);
+                }
+            }
+            Err(e) => {
+                eprintln!("connection error: {}", e);
+                break;
+            }
+        }
+    }
+    Ok(())
+}
+
+fn process_metrics(
+    server_ip: IpAddr,
+    json_str: &str,
+    healths: &HashMap<IpAddr, Arc<RwLock<ServerMetrics>>>,
+) -> Result<(), String> {
+    let parsed: Value =
+        serde_json::from_str(json_str).map_err(|e| format!("parse error: {}", e))?;
+
+    let metrics_lock = healths
+        .get(&server_ip)
+        .ok_or_else(|| format!("unknown server: {}", server_ip))?;
+
+    let get_f64 = |key: &str| -> Result<f64, String> {
+        parsed
+            .get(key)
+            .and_then(|v| v.as_f64())
+            .ok_or_else(|| format!("invalid '{}'", key))
+    };
+
+    if let Ok(mut guard) = metrics_lock.write() {
+        guard.update(
+            get_f64("cpu")?,
+            get_f64("mem")?,
+            get_f64("net")?,
+            get_f64("io")?,
+        );
+    }
+
+    Ok(())
+}
--- a/src/backend/mod.rs
+++ b/src/backend/mod.rs
@@ -1,29 +1,12 @@
 pub mod health;

+use crate::backend::health::ServerMetrics;
 use core::fmt;
 use std::net::SocketAddr;
 use std::sync::Arc;
 use std::sync::RwLock;
 use std::sync::atomic::{AtomicUsize, Ordering};

-// Physical server health statistics, used for certain load balancing algorithms
-#[derive(Debug, Default)]
-pub struct ServerMetrics {
-    pub cpu: f64,
-    pub mem: f64,
-    pub net: f64,
-    pub io: f64,
-}
-
-impl ServerMetrics {
-    pub fn update(&mut self, cpu: f64, mem: f64, net: f64, io: f64) {
-        self.cpu = cpu;
-        self.mem = mem;
-        self.net = net;
-        self.io = io;
-    }
-}
-
 // A possible endpoint for a proxied connection.
 // Note that multiple may live on the same server, hence the Arc<RwLock<ServerMetric>>
 #[derive(Debug)]
--- a/src/balancer/adaptive_weight.rs
+++ b/src/balancer/adaptive_weight.rs
@@ -1,4 +1,5 @@
-use crate::backend::{Backend, BackendPool, ServerMetrics};
+use crate::backend::{Backend, BackendPool};
+use crate::backend::health::ServerMetrics;
 use crate::balancer::{Balancer, ConnectionInfo};
 use rand::prelude::*;
 use rand::rngs::SmallRng;
@@ -27,7 +28,7 @@ impl AdaptiveWeightBalancer {
            .iter()
            .map(|b| AdaptiveNode {
                backend: b.clone(),
-                weight: 0f64,
+                weight: 1f64,
            })
            .collect();

@@ -85,7 +86,6 @@ impl Balancer for AdaptiveWeightBalancer {
            };

            let ratio = risk / node.weight;
-
            if ratio <= threshold {
                return Some(node.backend.clone());
            }
@@ -142,3 +142,126 @@ impl Balancer for AdaptiveWeightBalancer {
        }
    }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::backend::Backend;
+    use std::net::SocketAddr;
+
+    fn backend_factory(id: &str, ip: &str, port: u16) -> Arc<Backend> {
+        Arc::new(Backend::new(
+            id.to_string(),
+            SocketAddr::new(ip.parse().unwrap(), port),
+            Arc::new(RwLock::new(ServerMetrics::default())),
+        ))
+    }
+
+    fn unused_ctx() -> ConnectionInfo {
+        ConnectionInfo {
+            client_ip: ("0.0.0.0".parse().unwrap()),
+        }
+    }
+
+    #[test]
+    fn basic_weight_update_and_choose() {
+        let backends = BackendPool::new(vec![
+            backend_factory("server-0", "127.0.0.1", 3000),
+            backend_factory("server-1", "127.0.0.1", 3001),
+        ]);
+        let mut b = AdaptiveWeightBalancer::new(backends.clone(), [0.5, 0.2, 0.2, 0.1], 0.5);
+        // initially equal weights
+        // update one backend to be heavily loaded
+        {
+            let mut sm0_guard = backends.backends.get(0).unwrap().metrics.write().unwrap();
+            sm0_guard.update(90.0, 80.0, 10.0, 5.0);
+        }
+        {
+            let mut sm1_guard = backends.backends.get(1).unwrap().metrics.write().unwrap();
+            sm1_guard.update(10.0, 5.0, 1.0, 1.0);
+        }
+
+        // Choose backend: should pick the less loaded host server1
+        let chosen = b
+            .choose_backend(unused_ctx())
+            .expect("should choose a backend");
+
+        let sm0: &ServerMetrics = &backends.backends.get(0).unwrap().metrics.read().unwrap();
+        let sm1: &ServerMetrics = &backends.backends.get(1).unwrap().metrics.read().unwrap();
+        println!("{:?}, {:?}", sm0, sm1);
+        assert_eq!(chosen.id, "server-1");
+    }
+
+    #[test]
+    fn choose_none_when_empty() {
+        let mut b =
+            AdaptiveWeightBalancer::new(BackendPool::new(vec![]), [0.5, 0.2, 0.2, 0.1], 0.5);
+        assert!(b.choose_backend(unused_ctx()).is_none());
+    }
+
+    #[test]
+    fn ratio_triggers_immediate_selection() {
+        // Arrange two servers where server 1 has composite load 0 and server 2 has composite load 100.
+        // With alpha = 1.0 and two servers, threshold = 1.0 * (r_sum / w_sum) = 1.0 * (100 / 2) = 50.
+        // Server 0 ratio = 0 / 1 = 0 <= 50 so it should be chosen immediately.
+        let backends = BackendPool::new(vec![
+            backend_factory("server-0", "127.0.0.1", 3000),
+            backend_factory("server-1", "127.0.0.1", 3001),
+        ]);
+        let mut b = AdaptiveWeightBalancer::new(backends.clone(), [0.25, 0.25, 0.25, 0.25], 1.0);
+
+        {
+            let mut sm0_guard = backends.backends.get(0).unwrap().metrics.write().unwrap();
+            sm0_guard.update(0.0, 0.0, 0.0, 0.0);
+        }
+        {
+            let mut sm1_guard = backends.backends.get(1).unwrap().metrics.write().unwrap();
+            sm1_guard.update(100.0, 100.0, 100.0, 100.0);
+        }
+
+        let chosen = b
+            .choose_backend(unused_ctx())
+            .expect("should choose a backend");
+        assert_eq!(chosen.id, "server-0");
+    }
+
+    #[test]
+    fn choose_min_current_load_when_no_ratio() {
+        // Arrange three servers with identical composite loads so no server satisfies Ri/Wi <= threshold
+        // (set alpha < 1 so threshold < ratio). The implementation then falls back to picking the
+        // server with minimum current_load
+        let backends = BackendPool::new(vec![
+            backend_factory("server-0", "127.0.0.1", 3000),
+            backend_factory("server-1", "127.0.0.1", 3001),
+            backend_factory("server-2", "127.0.0.1", 3002),
+        ]);
+
+        // set current_loads (field expected to be public)
+
+        {
+            let mut sm0_guard = backends.backends.get(0).unwrap().metrics.write().unwrap();
+            sm0_guard.update(10.0, 10.0, 10.0, 10.0);
+        }
+        {
+            let mut sm1_guard = backends.backends.get(1).unwrap().metrics.write().unwrap();
+            sm1_guard.update(5.0, 5.0, 5.0, 5.0);
+        }
+        {
+            let mut sm2_guard = backends.backends.get(2).unwrap().metrics.write().unwrap();
+            sm2_guard.update(20.0, 20.0, 20.0, 20.0);
+        }
+
+        // Use coeffs that only consider CPU so composite load is easy to reason about.
+        let mut bal = AdaptiveWeightBalancer::new(backends.clone(), [1.0, 0.0, 0.0, 0.0], 0.5);
+
+        // set identical composite loads > 0 for all so ratio = x and threshold = alpha * x < x
+        // you will have threshold = 25 for all 3 backend servers and ratio = 50
+        // so that forces to choose the smallest current load backend
+
+        let chosen = bal
+            .choose_backend(unused_ctx())
+            .expect("should choose a backend");
+        // expect server with smallest current_load server-1
+        assert_eq!(chosen.id, "server-1");
+    }
+}
--- a/src/balancer/ip_hashing.rs
+++ b/src/balancer/ip_hashing.rs
@@ -1,7 +1,7 @@
 use crate::backend::{Backend, BackendPool};
 use crate::balancer::{Balancer, ConnectionInfo};
 use std::hash::{DefaultHasher, Hash, Hasher};
-use std::sync::{Arc, RwLock};
+use std::sync::Arc;

 #[derive(Debug)]
 pub struct SourceIPHash {
@@ -30,8 +30,9 @@ impl Balancer for SourceIPHash {
 #[cfg(test)]
 mod tests {
    use super::*;
+    use crate::backend::health::ServerMetrics;
    use std::net::IpAddr;
-    use crate::backend::ServerMetrics;
+    use std::sync::RwLock;

    fn create_dummy_backends(count: usize) -> BackendPool {
        let mut backends = Vec::new();
--- a/src/balancer/least_connections.rs
+++ b/src/balancer/least_connections.rs
@@ -1 +1 @@
-use super::*;
+// use super::*;
--- a/src/balancer/round_robin.rs
+++ b/src/balancer/round_robin.rs
@@ -1,7 +1,7 @@
 use crate::backend::{Backend, BackendPool};
 use crate::balancer::{Balancer, ConnectionInfo};
 use std::fmt::Debug;
-use std::sync::{Arc, RwLock};
+use std::sync::Arc;

 // only the main thread for receiving connections should be
 // doing the load balancing. alternatively, each thread
--- a/src/config/loader.rs
+++ b/src/config/loader.rs
@@ -3,6 +3,7 @@ use std::collections::HashMap;
 use std::net::{IpAddr, SocketAddr};
 use std::sync::{Arc, RwLock};

+use crate::backend::health::*;
 use crate::backend::*;
 use crate::balancer::Balancer;
 use crate::balancer::adaptive_weight::AdaptiveWeightBalancer;
@@ -18,24 +19,26 @@ pub type PortListeners = HashMap<u16, RoutingTable>;

 fn parse_client(s: &str) -> Result<(IpCidr, u16), String> {
    // just splits "0.0.0.0/0:80" into ("0.0.0.0/0", 80)
-    let (ip_part, port_part) = s.rsplit_once(':')
+    let (ip_part, port_part) = s
+        .rsplit_once(':')
        .ok_or_else(|| format!("badly formatted client: {}", s))?;

-    let port = port_part.parse()
-        .map_err(|_| format!("bad port: {}", s))?;
-    let cidr = ip_part.parse()
-        .map_err(|_| format!("bad ip/mask: {}", s))?;
+    let port = port_part.parse().map_err(|_| format!("bad port: {}", s))?;
+    let cidr = ip_part.parse().map_err(|_| format!("bad ip/mask: {}", s))?;

    Ok((cidr, port))
 }

-
-pub fn build_lb(config: AppConfig) -> Result<(PortListeners, HashMap<IpAddr, Arc<RwLock<ServerMetrics>>>), String> {
+pub fn build_lb(
+    config: &AppConfig,
+) -> Result<(PortListeners, HashMap<IpAddr, Arc<RwLock<ServerMetrics>>>), String> {
    let mut healths: HashMap<IpAddr, Arc<RwLock<ServerMetrics>>> = HashMap::new();
    let mut backends: HashMap<String, Arc<Backend>> = HashMap::new();

-    for backend_cfg in config.backends {
-        let ip: IpAddr = backend_cfg.ip.parse()
+    for backend_cfg in &config.backends {
+        let ip: IpAddr = backend_cfg
+            .ip
+            .parse()
            .map_err(|_| format!("bad ip: {}", backend_cfg.ip))?;
        let addr = SocketAddr::new(ip, backend_cfg.port);

@@ -46,12 +49,12 @@ pub fn build_lb(config: AppConfig) -> Result<(PortListeners, HashMap<IpAddr, Arc

        let backend = Arc::new(Backend::new(backend_cfg.id.clone(), addr, health));

-        backends.insert(backend_cfg.id, backend);
+        backends.insert(backend_cfg.id.clone(), backend);
    }

    let mut listeners: PortListeners = HashMap::new();

-    for rule in config.rules {
+    for rule in &config.rules {
        let mut target_backends = Vec::new();

        for target_name in &rule.targets {
@@ -84,7 +87,7 @@ pub fn build_lb(config: AppConfig) -> Result<(PortListeners, HashMap<IpAddr, Arc
        // cost of minor penalty to load balancing "quality" when you have several client ports.
        let mut port_groups: HashMap<u16, Vec<IpCidr>> = HashMap::new();

-        for client_def in rule.clients {
+        for client_def in &rule.clients {
            let (cidr, port) = parse_client(&client_def)?;
            port_groups.entry(port).or_default().push(cidr);
        }
--- a/src/config/mod.rs
+++ b/src/config/mod.rs
@@ -16,11 +16,27 @@ pub mod loader;
 use serde::Deserialize;
 use std::collections::HashMap;

+fn default_healthcheck_addr() -> String {
+    "0.0.0.0:8080".to_string()
+}
+
+fn default_iperf_addr() -> String {
+    "0.0.0.0:5201".to_string()
+}
+
 #[derive(Debug, Deserialize)]
 pub struct AppConfig {
+    #[serde(default = "default_healthcheck_addr")]
+    pub healthcheck_addr: String,
+
+    #[serde(default = "default_iperf_addr")]
+    pub iperf_addr: String,
+
    pub backends: Vec<BackendConfig>,
+
    #[serde(default)]
    pub clusters: HashMap<String, Vec<String>>,
+
    pub rules: Vec<RuleConfig>,
 }

--- a/src/main.rs
+++ b/src/main.rs
@@ -3,29 +3,35 @@ mod balancer;
 mod config;
 mod proxy;

-use std::collections::HashMap;
-use crate::balancer::{ConnectionInfo};
+use crate::backend::health::{start_healthcheck_listener, start_iperf_server, ServerMetrics};
+use crate::balancer::ConnectionInfo;
+use crate::config::loader::{build_lb, RoutingTable};
 use crate::proxy::tcp::proxy_tcp_connection;
+use anywho::Error;
+use std::collections::HashMap;
 use std::fs::File;
+use std::hash::Hash;
+use std::net::{IpAddr, SocketAddr};
 use std::path::PathBuf;
-use std::net::IpAddr;
 use std::sync::atomic::{AtomicU64, Ordering};
 use std::sync::{Arc, Mutex, RwLock};
 use std::time::Duration;
-use anywho::Error;
+use tokio::io::AsyncBufReadExt;
 use tokio::net::TcpListener;
 use tokio::sync::mpsc;
-use crate::backend::ServerMetrics;
-use crate::config::loader::{build_lb, RoutingTable};
-
-use notify::{Watcher, RecursiveMode, Event};
 use clap::Parser;
+use notify::{Event, RecursiveMode, Watcher};
+use std::cmp;

 static NEXT_CONN_ID: AtomicU64 = AtomicU64::new(1);

 struct ProgramState {
    tx_rt_map: HashMap<u16, mpsc::UnboundedSender<RoutingTable>>,
    healths: HashMap<IpAddr, Arc<RwLock<ServerMetrics>>>,
+    health_listener: Option<tokio::task::JoinHandle<()>>,
+    iperf_server: Option<tokio::task::JoinHandle<()>>,
+    health_listener_addr: Option<String>,
+    iperf_server_addr: Option<String>,
 }

 #[derive(Parser, Debug)]
@@ -49,6 +55,10 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let state = Arc::new(Mutex::new(ProgramState {
        tx_rt_map: HashMap::new(),
        healths: HashMap::new(),
+        health_listener: None,
+        iperf_server: None,
+        health_listener_addr: None,
+        iperf_server_addr: None,
    }));

    if let Err(e) = load_config(&args.config, state.clone()).await {
@@ -57,6 +67,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {

    let config_path = args.config.clone();
    let state_clone = state.clone();
+
    tokio::spawn(async move {
        let (tx, mut rx) = mpsc::channel(1);

@@ -66,26 +77,42 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
                    let _ = tx.blocking_send(());
                }
            }
-        }).unwrap();
+        })
+        .unwrap();

-        watcher.watch(&config_path, RecursiveMode::NonRecursive).unwrap();
+        watcher
+            .watch(&config_path, RecursiveMode::NonRecursive)
+            .unwrap();
        println!("watching for changes to {:?}", config_path);

        while rx.recv().await.is_some() {
+            // for some reason, saving on certain text editors fires several events,
+            // and this causes us to reload a lot. try to flush some events, add a tiny delay
+            // to mitigate this
+
+            while rx.try_recv().is_ok() {}
+            tokio::time::sleep(Duration::from_millis(50)).await;
+            while rx.try_recv().is_ok() {}
+
            if let Err(e) = load_config(&config_path, state_clone.clone()).await {
                eprintln!("loading config failed: {}", e);
            }
        }
    });

-    loop { tokio::time::sleep(Duration::from_hours(1)).await; }
+    loop {
+        tokio::time::sleep(Duration::from_hours(1)).await;
+    }
 }

 async fn load_config(path: &PathBuf, state: Arc<Mutex<ProgramState>>) -> Result<(), Error> {
    let f = File::open(path)?;
    let app_config: config::AppConfig = match serde_saphyr::from_reader(f) {
        Ok(app_config) => app_config,
-        Err(e) => { eprintln!("error parsing config {}", e); return Ok(()); }
+        Err(e) => {
+            eprintln!("error parsing config {}", e);
+            return Ok(());
+        }
    };

    println!(
@@ -94,7 +121,7 @@ async fn load_config(path: &PathBuf, state: Arc<Mutex<ProgramState>>) -> Result<
        app_config.rules.len()
    );

-    let (mut listeners, health_monitors) = match build_lb(app_config) {
+    let (mut listeners, health_monitors) = match build_lb(&app_config) {
        Ok(v) => v,
        Err(e) => {
            eprintln!("config has logical errors: {}", e);
@@ -103,7 +130,8 @@ async fn load_config(path: &PathBuf, state: Arc<Mutex<ProgramState>>) -> Result<
    };
    let mut prog_state = state.lock().unwrap();

-    let ports_to_remove: Vec<u16> = prog_state.tx_rt_map
+    let ports_to_remove: Vec<u16> = prog_state
+        .tx_rt_map
        .keys()
        .cloned()
        .filter(|port| !listeners.contains_key(port))
@@ -113,6 +141,38 @@ async fn load_config(path: &PathBuf, state: Arc<Mutex<ProgramState>>) -> Result<
        prog_state.tx_rt_map.remove(&port);
    }

+    if let Some(handle) = prog_state.health_listener.take() {
+        handle.abort();
+    }
+    let health_map: HashMap<IpAddr, Arc<RwLock<ServerMetrics>>> = health_monitors.clone();
+    let health_addr = app_config.healthcheck_addr.clone();
+    let health_addr_c = health_addr.clone();
+    let health_handle = tokio::spawn(async move {
+        if let Err(e) = start_healthcheck_listener(&health_addr, health_map).await {
+            eprintln!("health check listener failed: {}", e);
+        }
+    });
+    prog_state.health_listener = Some(health_handle);
+    prog_state.health_listener_addr = Some(health_addr_c);
+
+    // maybe restart iperf server
+    let iperf_addr = app_config.iperf_addr.clone();
+    if prog_state.iperf_server_addr.as_ref() != Some(&iperf_addr) {
+        if let Some(handle) = prog_state.iperf_server.take() {
+            handle.abort();
+        }
+
+        let iperf_addr_c = iperf_addr.clone();
+        let iperf_handle = tokio::spawn(async move {
+            if let Err(e) = start_iperf_server(iperf_addr.as_str()).await {
+                eprintln!("iperf server failed: {}", e);
+            }
+        });
+
+        prog_state.iperf_server = Some(iperf_handle);
+        prog_state.iperf_server_addr = Some(iperf_addr_c);
+    }
+
    prog_state.healths = health_monitors;
    for (port, routing_table) in listeners.drain() {
        if let Some(x) = prog_state.tx_rt_map.get_mut(&port) {
@@ -133,7 +193,7 @@ async fn load_config(path: &PathBuf, state: Arc<Mutex<ProgramState>>) -> Result<
 async fn run_listener(
    port: u16,
    mut rx_rt: mpsc::UnboundedReceiver<RoutingTable>,
-    mut current_table: RoutingTable
+    mut current_table: RoutingTable,
 ) {
    let addr = format!("0.0.0.0:{}", port);
    println!("Starting tcp listener on {}", addr);
Author	SHA1	Message	Date
Ning Qi (Paul) Sun	5e165b0c6a	Merge branch 'main' into healthcheck	2025-12-10 18:59:20 -05:00
psun256	09966c1e85	applied hot reload to health check logic	2025-12-10 18:58:47 -05:00
Phong Nguyen	8d3ce72649	Merge pull request #4 from psun256/tests/adaptive_weights feat: adaptive weight tests	2025-12-10 18:29:37 -05:00
nnhphong	7a68e4b17b	fix the test	2025-12-10 18:26:52 -05:00
nnhphong	a9db727bde	fix the test, all pass now	2025-12-10 18:08:54 -05:00
Jeremy Janella	3b96043dc6	feat: adaptive weight tests	2025-12-10 17:25:16 -05:00
Ning Qi (Paul) Sun	9c24f172e9	Merge branch 'main' into healthcheck	2025-12-10 16:49:16 -05:00
Ning Qi (Paul) Sun	047753ef70	Merge pull request #2 from psun256/auto-reload added config hot reload	2025-12-10 16:38:38 -05:00
psun256	b5547acb42	fix server metrics framing issue	2025-12-10 16:28:51 -05:00
nnhphong	99e39e82c1	too much changes, idek anymore	2025-12-10 15:36:51 -05:00