cli: Add global pex config

bridge/src/config.rs

@@ -171,6 +171,26 @@ where
     }
 }
 
+impl<T> ConfigEntry<T>
+where
+    T: Serialize + DeserializeOwned + fmt::Debug + Default,
+{
+    pub async fn modify<F>(&self, f: F) -> Result<(), ConfigError>
+    where
+        F: FnOnce(&mut T),
+    {
+        let mut value = match self.get().await {
+            Ok(value) => value,
+            Err(ConfigError::NotFound) => T::default(),
+            Err(error) => return Err(error),
+        };
+
+        f(&mut value);
+
+        self.set(&value).await
+    }
+}
+
 #[derive(Error, Debug)]
 pub enum ConfigError {
     #[error("config entry not found")]

bridge/src/network.rs

@@ -43,6 +43,8 @@ const LAST_USED_UDP_PORT_COMMENT: &str =
      This, in turn, is mainly useful for users who can't or don't want to use UPnP and have to\n\
      default to manually setting up port forwarding on their routers.";
 
+const PEX_KEY: ConfigKey<PexConfig> = ConfigKey::new("pex", "Peer exchange configuration");
+
 #[derive(Eq, PartialEq, Debug, Serialize, Deserialize)]
 pub struct NetworkDefaults {
     pub port_forwarding_enabled: bool,
@@ -72,6 +74,10 @@ pub async fn init(network: &Network, config: &ConfigStore, defaults: NetworkDefa
     for peer in peers {
         network.add_user_provided_peer(&peer);
     }
+
+    let PexConfig { send, recv } = config.entry(PEX_KEY).get().await.unwrap_or_default();
+    network.set_pex_send_enabled(send);
+    network.set_pex_recv_enabled(recv);
 }
 
 /// Binds the network to the specified addresses.
@@ -162,6 +168,28 @@ pub async fn user_provided_peers(config: &ConfigStore) -> Vec<PeerAddr> {
     config.entry(PEERS_KEY).get().await.unwrap_or_default()
 }
 
+/// Enables/disables sending contacts over PEX.
+pub async fn set_pex_send_enabled(network: &Network, config: &ConfigStore, enabled: bool) {
+    config
+        .entry(PEX_KEY)
+        .modify(|pex_config| pex_config.send = enabled)
+        .await
+        .ok();
+
+    network.set_pex_send_enabled(enabled);
+}
+
+/// Enables/disables receiving contacts over PEX.
+pub async fn set_pex_recv_enabled(network: &Network, config: &ConfigStore, enabled: bool) {
+    config
+        .entry(PEX_KEY)
+        .modify(|pex_config| pex_config.recv = enabled)
+        .await
+        .ok();
+
+    network.set_pex_recv_enabled(enabled);
+}
+
 /// Utility to help reuse bind ports across network restarts.
 struct LastUsedPorts {
     quic_v4: u16,
@@ -269,6 +297,23 @@ impl LastUsedPorts {
     }
 }
 
+#[derive(Debug, Serialize, Deserialize)]
+struct PexConfig {
+    // Is sending contacts over PEX enabled?
+    send: bool,
+    // Is receiving contacts over PEX enabled?
+    recv: bool,
+}
+
+impl Default for PexConfig {
+    fn default() -> Self {
+        Self {
+            send: true,
+            recv: true,
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

cli/src/handler/local.rs

@@ -382,14 +382,48 @@ impl ouisync_bridge::transport::Handler for LocalHandler {
                     Ok(holder.registration.is_dht_enabled().into())
                 }
             }
-            Request::Pex { name, enabled } => {
-                let holder = self.state.repositories.find(&name)?;
+            Request::Pex {
+                name,
+                enabled,
+                send,
+                recv,
+            } => {
+                if let Some(name) = name {
+                    let holder = self.state.repositories.find(&name)?;
+
+                    if let Some(enabled) = enabled {
+                        holder.registration.set_pex_enabled(enabled).await;
+                        Ok(().into())
+                    } else {
+                        Ok(holder.registration.is_pex_enabled().into())
+                    }
+                } else if send.is_some() || recv.is_some() {
+                    if let Some(send) = send {
+                        ouisync_bridge::network::set_pex_send_enabled(
+                            &self.state.network,
+                            &self.state.config,
+                            send,
+                        )
+                        .await;
+                    }
+
+                    if let Some(recv) = recv {
+                        ouisync_bridge::network::set_pex_recv_enabled(
+                            &self.state.network,
+                            &self.state.config,
+                            recv,
+                        )
+                        .await;
+                    }
 
-                if let Some(enabled) = enabled {
-                    holder.registration.set_pex_enabled(enabled).await;
                     Ok(().into())
                 } else {
-                    Ok(holder.registration.is_pex_enabled().into())
+                    Ok(format!(
+                        "send: {} recv: {}",
+                        self.state.network.is_pex_send_enabled(),
+                        self.state.network.is_pex_recv_enabled(),
+                    )
+                    .into())
                 }
             }
             Request::Quota {

cli/src/protocol.rs

@@ -1,5 +1,8 @@
 use chrono::{DateTime, SecondsFormat, Utc};
-use clap::{builder::BoolishValueParser, Subcommand, ValueEnum};
+use clap::{
+    builder::{ArgPredicate, BoolishValueParser},
+    Subcommand, ValueEnum,
+};
 use ouisync_lib::{AccessMode, PeerAddr, PeerInfo, PeerSource, PeerState, StorageSize};
 use serde::{Deserialize, Serialize};
 use std::{
@@ -210,13 +213,39 @@ pub(crate) enum Request {
         #[arg(value_parser = BoolishValueParser::new())]
         enabled: Option<bool>,
     },
-    /// Enable or disable Peer Exchange (PEX)
+    /// Configure Peer Exchange (PEX)
     Pex {
+        /// Name of the repository to enable/disable PEX for.
         #[arg(short = 'n', long)]
-        name: String,
+        name: Option<String>,
 
-        /// Whether to enable or disable. If omitted, prints the current state.
-        #[arg(value_parser = BoolishValueParser::new())]
+        /// Globally enable/disable sending contacts over PEX. If all of name, send, recv are
+        /// omitted, prints the current state.
+        #[arg(
+            short,
+            long,
+            conflicts_with_all = ["name", "enabled"],
+            value_parser = BoolishValueParser::new(),
+            value_name = "ENABLED"
+        )]
+        send: Option<bool>,
+
+        /// Globally enable/disable receiving contacts over PEX. If all of name, send, recv are
+        /// omitted, prints the current state.
+        #[arg(
+            short,
+            long,
+            conflicts_with_all = ["name", "enabled"],
+            value_parser = BoolishValueParser::new(),
+            value_name = "ENABLED"
+        )]
+        recv: Option<bool>,
+
+        /// Enable/disable PEX for the specified repository. If omitted, prints the current state.
+        #[arg(
+            requires_if(ArgPredicate::IsPresent, "name"),
+            value_parser = BoolishValueParser::new(),
+        )]
         enabled: Option<bool>,
     },
     /// Get or set storage quota
@@ -316,6 +345,12 @@ impl From<String> for Response {
     }
 }
 
+impl<'a> From<&'a str> for Response {
+    fn from(value: &'a str) -> Self {
+        Self::String(value.to_owned())
+    }
+}
+
 impl From<Vec<String>> for Response {
     fn from(value: Vec<String>) -> Self {
         Self::Strings(value)