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Feat: Include HAProxy and per-IP connection limits #156

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Feat: Include HAProxy and per-IP connection limits
junderw Jun 6, 2026
baad479
Don't choke on PROXY headers, but ignore them if we're not configured…
junderw Jun 6, 2026
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10 changes: 10 additions & 0 deletions Cargo.lock
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1 change: 1 addition & 0 deletions Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,7 @@ socket2 = { version = "0.4", features = ["all"] }
num_cpus = "1.12.0"
page_size = "0.4.2"
prometheus = "0.13"
ppp = "2.3.0"
rayon = "1.5.0"
rocksdb = "0.24.0"
serde = "1.0.118"
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18 changes: 18 additions & 0 deletions src/config.rs
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Expand Up @@ -69,6 +69,8 @@ pub struct Config {
pub electrum_max_subscriptions: usize,
pub electrum_max_clients: usize,
pub electrum_idle_timeout: u64,
pub electrum_haproxy_depth: usize,
pub electrum_connections_per_client: usize,
pub electrum_public_hosts: Option<crate::electrum::ServerHosts>,

#[cfg(feature = "liquid")]
Expand Down Expand Up @@ -301,6 +303,16 @@ impl Config {
.long("electrum-idle-timeout")
.help("Maximum idle time in seconds since the last client request before disconnecting the Electrum connection.")
.default_value("600")
).arg(
Arg::with_name("electrum_haproxy_depth")
.long("electrum-haproxy-depth")
.help("Which HAProxy PROXY-protocol header layer identifies the real client IP. 0 disables PROXY-protocol detection; 1 uses the first (outermost) address, 2 the second, and so on. If the requested layer or any PROXY header is absent, no client IP is associated with the connection.")
.default_value("0")
).arg(
Arg::with_name("electrum_connections_per_client")
.long("electrum-connections-per-client")
.help("Maximum number of concurrent Electrum connections allowed per client (keyed by the HAProxy-reported address when available, otherwise the peer IP). 0 disables the per-client limit.")
.default_value("10")
);

#[cfg(unix)]
Expand Down Expand Up @@ -576,6 +588,12 @@ impl Config {
electrum_max_subscriptions: value_t_or_exit!(m, "electrum_max_subscriptions", usize),
electrum_max_clients: value_t_or_exit!(m, "electrum_max_clients", usize),
electrum_idle_timeout: value_t_or_exit!(m, "electrum_idle_timeout", u64),
electrum_haproxy_depth: value_t_or_exit!(m, "electrum_haproxy_depth", usize),
electrum_connections_per_client: value_t_or_exit!(
m,
"electrum_connections_per_client",
usize
),
jsonrpc_import: m.is_present("jsonrpc_import"),
light_mode: m.is_present("light_mode"),
main_loop_delay: value_t_or_exit!(m, "main_loop_delay", u64),
Expand Down
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