Generify commands in blocking/tokio (#24)

nut-client/Cargo.toml

@@ -28,7 +28,7 @@ async = ["tokio"]
 async-ssl = ["async", "tokio-rustls", "ssl"]
 
 # a feature gate for examples
-async-rt = ["tokio/rt-multi-thread", "tokio/macros"]
+async-rt = ["async", "tokio/rt-multi-thread", "tokio/macros"]
 
 [[example]]
 name = "async"

nut-client/src/blocking/mod.rs

@@ -3,7 +3,7 @@ use std::net::{SocketAddr, TcpStream};
 
 use crate::blocking::stream::ConnectionStream;
 use crate::cmd::{Command, Response};
-use crate::{ClientError, Config, Host, NutError, Variable};
+use crate::{ClientError, Config, Host, NutError};
 
 mod stream;
 
@@ -20,41 +20,6 @@ impl Connection {
             Host::Tcp(host) => Ok(Self::Tcp(TcpConnection::new(config.clone(), &host.addr)?)),
         }
     }
-
-    /// Queries a list of UPS devices.
-    pub fn list_ups(&mut self) -> crate::Result<Vec<(String, String)>> {
-        match self {
-            Self::Tcp(conn) => conn.list_ups(),
-        }
-    }
-
-    /// Queries a list of client IP addresses connected to the given device.
-    pub fn list_clients(&mut self, ups_name: &str) -> crate::Result<Vec<String>> {
-        match self {
-            Self::Tcp(conn) => conn.list_clients(ups_name),
-        }
-    }
-
-    /// Queries the list of variables for a UPS device.
-    pub fn list_vars(&mut self, ups_name: &str) -> crate::Result<Vec<Variable>> {
-        match self {
-            Self::Tcp(conn) => Ok(conn
-                .list_vars(ups_name)?
-                .into_iter()
-                .map(|(key, val)| Variable::parse(key.as_str(), val))
-                .collect()),
-        }
-    }
-
-    /// Queries one variable for a UPS device.
-    pub fn get_var(&mut self, ups_name: &str, variable: &str) -> crate::Result<Variable> {
-        match self {
-            Self::Tcp(conn) => {
-                let var = conn.get_var(ups_name, variable)?;
-                Ok(Variable::parse(var.0.as_str(), var.1))
-            }
-        }
-    }
 }
 
 /// A blocking TCP NUT client connection.
@@ -129,7 +94,8 @@ impl TcpConnection {
             self.stream = self.stream.upgrade_ssl(sess)?;
 
             // Send a test command
-            self.get_network_version()?;
+            self.write_cmd(Command::NetworkVersion)?;
+            self.read_plain_response()?;
         }
         Ok(self)
     }
@@ -154,44 +120,7 @@ impl TcpConnection {
         Ok(())
     }
 
-    fn list_ups(&mut self) -> crate::Result<Vec<(String, String)>> {
-        let query = &["UPS"];
-        self.write_cmd(Command::List(query))?;
-
-        let list = self.read_list(query)?;
-        list.into_iter().map(|row| row.expect_ups()).collect()
-    }
-
-    fn list_clients(&mut self, ups_name: &str) -> crate::Result<Vec<String>> {
-        let query = &["CLIENT", ups_name];
-        self.write_cmd(Command::List(query))?;
-
-        let list = self.read_list(query)?;
-        list.into_iter().map(|row| row.expect_client()).collect()
-    }
-
-    fn list_vars(&mut self, ups_name: &str) -> crate::Result<Vec<(String, String)>> {
-        let query = &["VAR", ups_name];
-        self.write_cmd(Command::List(query))?;
-
-        let list = self.read_list(query)?;
-        list.into_iter().map(|row| row.expect_var()).collect()
-    }
-
-    fn get_var(&mut self, ups_name: &str, variable: &str) -> crate::Result<(String, String)> {
-        let query = &["VAR", ups_name, variable];
-        self.write_cmd(Command::Get(query))?;
-
-        self.read_response()?.expect_var()
-    }
-
-    #[allow(dead_code)]
-    fn get_network_version(&mut self) -> crate::Result<String> {
-        self.write_cmd(Command::NetworkVersion)?;
-        self.read_plain_response()
-    }
-
-    fn write_cmd(&mut self, line: Command) -> crate::Result<()> {
+    pub(crate) fn write_cmd(&mut self, line: Command) -> crate::Result<()> {
         let line = format!("{}\n", line);
         if self.config.debug {
             eprint!("DEBUG -> {}", line);
@@ -219,19 +148,19 @@ impl TcpConnection {
         Ok(args)
     }
 
-    fn read_response(&mut self) -> crate::Result<Response> {
+    pub(crate) fn read_response(&mut self) -> crate::Result<Response> {
         let mut reader = BufReader::new(&mut self.stream);
         let args = Self::parse_line(&mut reader, self.config.debug)?;
         Response::from_args(args)
     }
 
-    fn read_plain_response(&mut self) -> crate::Result<String> {
+    pub(crate) fn read_plain_response(&mut self) -> crate::Result<String> {
         let mut reader = BufReader::new(&mut self.stream);
         let args = Self::parse_line(&mut reader, self.config.debug)?;
         Ok(args.join(" "))
     }
 
-    fn read_list(&mut self, query: &[&str]) -> crate::Result<Vec<Response>> {
+    pub(crate) fn read_list(&mut self, query: &[&str]) -> crate::Result<Vec<Response>> {
         let mut reader = BufReader::new(&mut self.stream);
         let args = Self::parse_line(&mut reader, self.config.debug)?;
 

nut-client/src/cmd.rs

@@ -1,6 +1,6 @@
 use core::fmt;
 
-use crate::{ClientError, NutError};
+use crate::{ClientError, NutError, Variable};
 
 #[derive(Debug, Clone)]
 pub enum Command<'a> {
@@ -214,9 +214,9 @@ impl Response {
         }
     }
 
-    pub fn expect_var(&self) -> crate::Result<(String, String)> {
+    pub fn expect_var(&self) -> crate::Result<Variable> {
         if let Self::Var(name, value) = &self {
-            Ok((name.to_owned(), value.to_owned()))
+            Ok(Variable::parse(name, value.to_owned()))
         } else {
             Err(NutError::UnexpectedResponse.into())
         }
@@ -238,3 +238,195 @@ impl Response {
         }
     }
 }
+
+/// A macro for implementing `LIST` commands.
+///
+/// Each function should return a 2-tuple with
+///     (1) the query to pass to `LIST`
+///     (2) a closure for mapping each `Response` row to the return type  
+macro_rules! implement_list_commands {
+    (
+        $(
+            $(#[$attr:meta])+
+            fn $name:ident($($argname:ident: $argty:ty),*) -> $retty:ty {
+                (
+                    $query:block,
+                    $mapper:block,
+                )
+            }
+        )*
+    ) => {
+        impl crate::blocking::Connection {
+            $(
+                $(#[$attr])*
+                pub fn $name(&mut self$(, $argname: $argty)*) -> crate::Result<$retty> {
+                    match self {
+                        Self::Tcp(conn) => {
+                            conn.write_cmd(Command::List($query))?;
+                            let list = conn.read_list($query)?;
+                            list.into_iter().map($mapper).collect()
+                        },
+                    }
+                }
+            )*
+        }
+
+        #[cfg(feature = "async")]
+        impl crate::tokio::Connection {
+            $(
+                $(#[$attr])*
+                pub async fn $name(&mut self$(, $argname: $argty)*) -> crate::Result<$retty> {
+                    match self {
+                        Self::Tcp(conn) => {
+                            conn.write_cmd(Command::List($query)).await?;
+                            let list = conn.read_list($query).await?;
+                            list.into_iter().map($mapper).collect()
+                        },
+                    }
+                }
+            )*
+        }
+    };
+}
+
+/// A macro for implementing `GET` commands.
+///
+/// Each function should return a 2-tuple with
+///     (1) the query to pass to `GET`
+///     (2) a closure for mapping the `Response` row to the return type
+macro_rules! implement_get_commands {
+    (
+        $(
+            $(#[$attr:meta])+
+            fn $name:ident($($argname:ident: $argty:ty),*) -> $retty:ty {
+                (
+                    $query:block,
+                    $mapper:block,
+                )
+            }
+        )*
+    ) => {
+        impl crate::blocking::Connection {
+            $(
+                $(#[$attr])*
+                pub fn $name(&mut self$(, $argname: $argty)*) -> crate::Result<$retty> {
+                    match self {
+                        Self::Tcp(conn) => {
+                            conn.write_cmd(Command::Get($query))?;
+                            ($mapper)(conn.read_response()?)
+                        },
+                    }
+                }
+            )*
+        }
+
+        #[cfg(feature = "async")]
+        impl crate::tokio::Connection {
+            $(
+                $(#[$attr])*
+                pub async fn $name(&mut self$(, $argname: $argty)*) -> crate::Result<$retty> {
+                    match self {
+                        Self::Tcp(conn) => {
+                            conn.write_cmd(Command::Get($query)).await?;
+                            ($mapper)(conn.read_response().await?)
+                        },
+                    }
+                }
+            )*
+        }
+    };
+}
+
+/// A macro for implementing simple/direct commands.
+///
+/// Each function should return a 2-tuple with
+///     (1) the command to pass
+///     (2) a closure for mapping the `String` row to the return type
+macro_rules! implement_simple_commands {
+    (
+        $(
+            $(#[$attr:meta])+
+            fn $name:ident($($argname:ident: $argty:ty),*) -> $retty:ty {
+                (
+                    $cmd:block,
+                    $mapper:block,
+                )
+            }
+        )*
+    ) => {
+        impl crate::blocking::Connection {
+            $(
+                $(#[$attr])*
+                pub fn $name(&mut self$(, $argname: $argty)*) -> crate::Result<$retty> {
+                    match self {
+                        Self::Tcp(conn) => {
+                            conn.write_cmd($cmd)?;
+                            ($mapper)(conn.read_plain_response()?)
+                        },
+                    }
+                }
+            )*
+        }
+
+        #[cfg(feature = "async")]
+        impl crate::tokio::Connection {
+            $(
+                $(#[$attr])*
+                pub async fn $name(&mut self$(, $argname: $argty)*) -> crate::Result<$retty> {
+                    match self {
+                        Self::Tcp(conn) => {
+                            conn.write_cmd($cmd).await?;
+                            ($mapper)(conn.read_plain_response().await?)
+                        },
+                    }
+                }
+            )*
+        }
+    };
+}
+
+implement_list_commands! {
+    /// Queries a list of UPS devices.
+    fn list_ups() -> Vec<(String, String)> {
+        (
+            { &["UPS"] },
+            { |row: Response| row.expect_ups() },
+        )
+    }
+
+    /// Queries a list of client IP addresses connected to the given device.
+    fn list_clients(ups_name: &str) -> Vec<String> {
+        (
+            { &["CLIENT", ups_name] },
+            { |row: Response| row.expect_client() },
+        )
+    }
+
+    /// Queries the list of variables for a UPS device.
+    fn list_vars(ups_name: &str) -> Vec<Variable> {
+        (
+            { &["VAR", ups_name] },
+            { |row: Response| row.expect_var() },
+        )
+    }
+}
+
+implement_get_commands! {
+    /// Queries one variable for a UPS device.
+    fn get_var(ups_name: &str, variable: &str) -> Variable {
+        (
+            { &["VAR", ups_name, variable] },
+            { |row: Response| row.expect_var() },
+        )
+    }
+}
+
+implement_simple_commands! {
+    /// Queries the network protocol version.
+    fn get_network_version() -> String {
+        (
+            { Command::NetworkVersion },
+            { |row: String| Ok(row) },
+        )
+    }
+}

nut-client/src/lib.rs

@@ -12,7 +12,7 @@ pub use var::*;
 /// Blocking client implementation for NUT.
 pub mod blocking;
 /// Async client implementation for NUT, using Tokio.
-#[cfg(feature = "tokio")]
+#[cfg(feature = "async")]
 pub mod tokio;
 
 mod cmd;