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//! [Server](#server) and [client](#client) support for the [varlink protocol](http://varlink.org) //! //! # Server //! //! To create a varlink server in rust, place your varlink interface definition file in src/. //! E.g. `src/org.example.ping.varlink`: //! //! ```varlink //! # Example service //! interface org.example.ping //! //! # Returns the same string //! method Ping(ping: string) -> (pong: string) //! ``` //! //! Then create a `build.rs` file in your project directory: //! //! ```rust,ignore //! extern crate varlink_generator; //! //! fn main() { //! varlink_generator::cargo_build_tosource("src/org.example.ping.varlink", //! /* rustfmt */ true); //! } //! ``` //! //! For more code generation functions see the [`generator functions`]. //! //! Add to your ```Cargo.toml```: //! //! ```toml //! [package] //! build = "build.rs" //! [build-dependencies] //! varlink_generator = "<version>" //! ``` //! //! In your `main.rs` you can then use: //! //! ```rust,ignore //! mod org_example_ping; //! ``` //! and then implement the interface: //! //! ```rust //! # #![allow(non_camel_case_types)] //! # #![allow(non_snake_case)] //! # use std::io; //! # use varlink::{CallTrait, Result}; //! # struct Ping_Reply {pong: String} //! # impl varlink::VarlinkReply for Ping_Reply {} //! # struct _PingArgs {ping: String} //! # pub trait VarlinkCallError: varlink::CallTrait {} //! # impl<'a> VarlinkCallError for varlink::Call<'a> {} //! # pub trait Call_Ping: VarlinkCallError { //! # fn reply(&mut self, pong: String) -> Result<()> { Ok(()) } //! # } //! # impl<'a> Call_Ping for varlink::Call<'a> {} //! # pub trait VarlinkInterface { //! # fn ping(&self, call: &mut Call_Ping, ping: String) -> Result<()>; //! # fn call_upgraded(&self, _call: &mut varlink::Call, bufreader: &mut io::BufRead) -> //! # Result<Vec<u8>> {Ok(Vec::new())} //! # } //! # pub struct _InterfaceProxy {inner: Box<VarlinkInterface + Send + Sync>} //! # pub fn new(inner: Box<VarlinkInterface + Send + Sync>) -> _InterfaceProxy { //! # _InterfaceProxy { inner } //! # } //! # impl varlink::Interface for _InterfaceProxy { //! # fn get_description(&self) -> &'static str { "interface org.example.ping\n\ //! # method Ping(ping: string) -> (pong: string)" } //! # fn get_name(&self) -> &'static str { "org.example.ping" } //! # fn call_upgraded(&self, call: &mut varlink::Call, _bufreader: &mut io::BufRead) -> //! # Result<Vec<u8>> { Ok(Vec::new()) } //! # fn call(&self, call: &mut varlink::Call) -> Result<()> { Ok(()) } //! # } //! # fn main() {} //! struct MyOrgExamplePing; //! //! impl VarlinkInterface for MyOrgExamplePing { //! fn ping(&self, call: &mut Call_Ping, ping: String) -> Result<()> { //! return call.reply(ping); //! } //! } //! ``` //! to implement the interface methods. //! //! If your varlink method is called `TestMethod`, the rust method to be implemented is called //! `test_method`. The first parameter is of type `Call_TestMethod`, which has the method `reply()`. //! //! ```rust //! # #![allow(non_camel_case_types)] //! # #![allow(non_snake_case)] //! # use std::io; //! # use varlink::{CallTrait, Result}; //! # pub trait VarlinkCallError: varlink::CallTrait {} //! # impl<'a> VarlinkCallError for varlink::Call<'a> {} //! # pub trait Call_TestMethod: VarlinkCallError { //! # fn reply(&mut self) -> Result<()> { //! # self.reply_struct(varlink::Reply::parameters(None)) //! # } //! # } //! # impl<'a> Call_TestMethod for varlink::Call<'a> {} //! # struct TestService; //! # impl TestService { //! fn test_method(&self, call: &mut Call_TestMethod, /* more arguments */) -> Result<()> { //! /* ... */ //! return call.reply( /* more arguments */ ); //! } //! # } //! # fn main() {} //! ``` //! //! A typical server creates a `VarlinkService` and starts a server via [`varlink::listen`] //! //! ```rust //! # #![allow(non_camel_case_types)] //! # #![allow(non_snake_case)] //! # use std::io; //! # mod org_example_ping { //! # use std::io; //! # use varlink::{self, Result}; //! # struct Ping_Reply {pong: String} //! # impl varlink::VarlinkReply for Ping_Reply {} //! # struct _PingArgs {ping: String} //! # pub trait VarlinkCallError: varlink::CallTrait {} //! # impl<'a> VarlinkCallError for varlink::Call<'a> {} //! # pub trait Call_Ping: VarlinkCallError { //! # fn reply(&mut self, pong: String) -> Result<()> { Ok(()) } //! # } //! # impl<'a> Call_Ping for varlink::Call<'a> {} //! # pub trait VarlinkInterface { //! # fn ping(&self, call: &mut Call_Ping, ping: String) -> Result<()>; //! # fn call_upgraded(&self, _call: &mut varlink::Call, bufreader: &mut io::BufRead) -> //! # Result<Vec<u8>> {Ok(Vec::new())} //! # } //! # pub struct _InterfaceProxy {inner: Box<VarlinkInterface + Send + Sync>} //! # pub fn new(inner: Box<VarlinkInterface + Send + Sync>) -> _InterfaceProxy { //! # _InterfaceProxy { inner } //! # } //! # impl varlink::Interface for _InterfaceProxy { //! # fn get_description(&self) -> &'static str { "interface org.example.ping\n\ //! # method Ping(ping: string) -> (pong: string)" } //! # fn get_name(&self) -> &'static str { "org.example.ping" } //! # fn call_upgraded(&self, call: &mut varlink::Call, _bufreader: &mut io::BufRead) -> //! # Result<Vec<u8>> { Ok(Vec::new()) } //! # fn call(&self, call: &mut varlink::Call) -> Result<()> { Ok(()) } //! # }} //! # use crate::org_example_ping::*; //! # //! # struct MyOrgExamplePing; //! # //! # impl org_example_ping::VarlinkInterface for MyOrgExamplePing { //! # fn ping(&self, call: &mut Call_Ping, ping: String) -> varlink::Result<()> { //! # return call.reply(ping); //! # } //! # } //! # fn main_func() { //! let args: Vec<_> = std::env::args().collect(); //! let myorgexampleping = MyOrgExamplePing; //! let myorgexampleping_interface = org_example_ping::new(Box::new(myorgexampleping)); //! //! let service = varlink::VarlinkService::new( //! "org.varlink", //! "test service", //! "0.1", //! "http://varlink.org", //! vec![ //! Box::new(myorgexampleping_interface), //! // more interfaces ... //! ], //! ); //! //! varlink::listen(service, &args[1], 1, 10, 0); //! # } //! # fn main() {} //! ``` //! //! where args[1] would follow the varlink //! [address specification](https://github.com/varlink/documentation/wiki#address). //! //! Currently supported address URIs are: //! //! - TCP `tcp:127.0.0.1:12345` hostname/IP address and port //! - UNIX socket `unix:/run/org.example.ftl` optional access `;mode=0666` parameter //! - UNIX abstract namespace socket `unix:@org.example.ftl` (on Linux only) //! //! # Client //! //! Setup your project, just like in the [server](#server) case with a varlink file //! and a ```build.rs``` file. //! //! In your `main.rs` you can then use: //! //! ```rust,ignore //! mod org_example_ping; //! use org_example_ping; //! let connection = Connection::with_address("unix:/tmp/org.example.ping").unwrap(); //! let mut ping_service = org_example_ping::VarlinkClient::new(connection); //! let reply = ping_service.ping(String::from("Test")).call()?; //! assert_eq!(String::from("Test"), reply.pong); //! ``` //! //! A connection can be established via the [`connection builder`] functions. //! The ```org_example_ping::VarlinkClient``` implements ```org_example_ping::VarlinkClientInterface```, //! which has all the varlink methods (names converted from camel case to lowercase snake case). //! The ```PingString()``` method would be named ```ping_string()```. //! //! To iterate over a ```more``` call //! ```rust,ignore //! for reply in my_more_service.test_more(/* params */).more()? { /*...*/ } //! ``` //! //! The reply struct is placed in a structure named after the method with ```_Reply``` appended. //! So, the reply to the ```Ping()``` method in our example is in a struct called ```Ping_Reply```. //! //! [`connection builder`]: struct.Connection.html#methods //! [`varlink::listen`]: fn.listen.html //! [`generator functions`]: https://docs.rs/varlink_generator #![doc( html_logo_url = "https://varlink.org/images/varlink.png", html_favicon_url = "https://varlink.org/images/varlink-small.png" )] use std::borrow::Cow; use std::collections::{HashMap, HashSet}; use std::convert::From; use std::io::{BufRead, BufReader, Read, Write}; use std::marker::PhantomData; use std::ops::{Deref, DerefMut}; use std::process::Child; use std::sync::{Arc, RwLock}; use serde::de::{self, DeserializeOwned}; use serde::ser::{Serialize, SerializeMap, Serializer}; use serde_derive::{Deserialize, Serialize}; use serde_json::{json, Value}; use tempfile::TempDir; pub use crate::client::VarlinkStream; use crate::client::{varlink_bridge, varlink_exec}; pub use crate::server::Stream as ServerStream; pub use crate::server::{listen, Listener}; #[macro_use] pub mod error; pub use error::{Error, ErrorKind, Result}; mod client; mod server; #[cfg(test)] mod test; #[derive(Serialize, Deserialize, Debug, PartialEq, Default)] pub struct ErrorInterfaceNotFound { pub interface: Option<String>, } #[derive(Serialize, Deserialize, Debug, PartialEq, Default)] pub struct ErrorInvalidParameter { pub parameter: Option<String>, } #[derive(Serialize, Deserialize, Debug, PartialEq, Default)] pub struct ErrorMethodNotImplemented { pub method: Option<String>, } #[derive(Serialize, Deserialize, Debug, PartialEq, Default)] pub struct ErrorMethodNotFound { pub method: Option<String>, } impl From<Reply> for ErrorKind { fn from(e: Reply) -> Self { match e { Reply { error: Some(ref t), .. } if t == "org.varlink.service.InterfaceNotFound" => match e { Reply { parameters: Some(p), .. } => match serde_json::from_value::<ErrorInterfaceNotFound>(p) { Ok(v) => ErrorKind::InterfaceNotFound(v.interface.unwrap_or_default()), Err(_) => ErrorKind::InterfaceNotFound(String::new()), }, _ => ErrorKind::InterfaceNotFound(String::new()), }, Reply { error: Some(ref t), .. } if t == "org.varlink.service.InvalidParameter" => match e { Reply { parameters: Some(p), .. } => match serde_json::from_value::<ErrorInvalidParameter>(p) { Ok(v) => ErrorKind::InvalidParameter(v.parameter.unwrap_or_default()), Err(_) => ErrorKind::InvalidParameter(String::new()), }, _ => ErrorKind::InvalidParameter(String::new()), }, Reply { error: Some(ref t), .. } if t == "org.varlink.service.MethodNotFound" => match e { Reply { parameters: Some(p), .. } => match serde_json::from_value::<ErrorMethodNotFound>(p) { Ok(v) => ErrorKind::MethodNotFound(v.method.unwrap_or_default()), Err(_) => ErrorKind::MethodNotFound(String::new()), }, _ => ErrorKind::MethodNotFound(String::new()), }, Reply { error: Some(ref t), .. } if t == "org.varlink.service.MethodNotImplemented" => match e { Reply { parameters: Some(p), .. } => match serde_json::from_value::<ErrorMethodNotImplemented>(p) { Ok(v) => ErrorKind::MethodNotImplemented(v.method.unwrap_or_default()), Err(_) => ErrorKind::MethodNotImplemented(String::new()), }, _ => ErrorKind::MethodNotImplemented(String::new()), }, _ => ErrorKind::VarlinkErrorReply(e), } } } impl ErrorKind { pub fn is_error(r: &Reply) -> bool { match r.error { Some(ref t) => match t.as_ref() { "org.varlink.service.InvalidParameter" => true, "org.varlink.service.InterfaceNotFound" => true, "org.varlink.service.MethodNotFound" => true, "org.varlink.service.MethodNotImplemented" => true, _ => false, }, _ => false, } } } /// This trait has to be implemented by any varlink interface implementor. /// All methods are generated by the varlink-rust-generator, so you don't have to care /// about them. pub trait Interface { fn get_description(&self) -> &'static str; fn get_name(&self) -> &'static str; fn call_upgraded(&self, call: &mut Call, bufreader: &mut BufRead) -> Result<Vec<u8>>; fn call(&self, call: &mut Call) -> Result<()>; } /// The structure of a varlink request. Used to serialize json into it. /// /// There should be no need to use this directly. #[derive(Serialize, Deserialize, Debug, PartialEq, Default, Clone)] pub struct Request<'a> { #[serde(skip_serializing_if = "Option::is_none")] pub more: Option<bool>, #[serde(skip_serializing_if = "Option::is_none")] pub oneway: Option<bool>, #[serde(skip_serializing_if = "Option::is_none")] pub upgrade: Option<bool>, pub method: Cow<'a, str>, #[serde(skip_serializing_if = "Option::is_none")] pub parameters: Option<Value>, } impl<'a> Request<'a> { pub fn create<S: Into<Cow<'a, str>>>(method: S, parameters: Option<Value>) -> Self { Request { more: None, oneway: None, upgrade: None, method: method.into(), parameters, } } } pub type StringHashMap<T> = HashMap<String, T>; #[derive(Debug, PartialEq, Default, Clone)] pub struct StringHashSet { inner: HashSet<String>, } impl StringHashSet { pub fn new() -> StringHashSet { StringHashSet { inner: HashSet::new(), } } } impl Deref for StringHashSet { type Target = HashSet<String>; fn deref(&self) -> &HashSet<String> { &self.inner } } impl DerefMut for StringHashSet { fn deref_mut(&mut self) -> &mut HashSet<String> { &mut self.inner } } impl Serialize for StringHashSet { fn serialize<S>(&self, serializer: S) -> ::std::result::Result<S::Ok, S::Error> where S: Serializer, { let null_obj: serde_json::Value = serde_json::Value::Object(serde_json::Map::new()); let mut map = serializer.serialize_map(Some(self.inner.len()))?; for k in &self.inner { map.serialize_entry(k, &null_obj)?; } map.end() } } impl<'de> de::Deserialize<'de> for StringHashSet { #[inline] fn deserialize<D>(deserializer: D) -> ::std::result::Result<Self, D::Error> where D: de::Deserializer<'de>, { struct Visitor; impl<'de> de::Visitor<'de> for Visitor { type Value = StringHashSet; fn expecting(&self, formatter: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { formatter.write_str("a map") } #[inline] fn visit_unit<E>(self) -> ::std::result::Result<Self::Value, E> where E: de::Error, { Ok(StringHashSet::new()) } #[inline] fn visit_map<V>(self, mut visitor: V) -> ::std::result::Result<Self::Value, V::Error> where V: de::MapAccess<'de>, { let mut values = StringHashSet::new(); while let Some(key) = visitor.next_key()? { values.insert(key); } Ok(values) } } deserializer.deserialize_map(Visitor) } } /// Marker trait for the rust code generated by the varlink-rust-generator /// /// There should be no need to use this directly. /// See the [CallTrait](trait.CallTrait.html) to use with the first Call parameter pub trait VarlinkReply {} /// The structure of a varlink reply. Used to deserialize it into json. /// /// There should be no need to use this directly. /// See the [CallTrait](trait.CallTrait.html) to use with the first Call parameter #[derive(Serialize, Deserialize, Debug, PartialEq, Default, Clone)] pub struct Reply { #[serde(skip_serializing_if = "Option::is_none")] pub continues: Option<bool>, #[serde(skip_serializing_if = "Option::is_none")] pub error: Option<Cow<'static, str>>, #[serde(skip_serializing_if = "Option::is_none")] pub parameters: Option<Value>, } impl Reply { pub fn parameters(parameters: Option<Value>) -> Self { Reply { continues: None, error: None, parameters, } } pub fn error<S: Into<Cow<'static, str>>>(name: S, parameters: Option<Value>) -> Self { Reply { continues: None, error: Some(name.into()), parameters, } } } impl<T> From<T> for Reply where T: VarlinkReply + Serialize, { fn from(a: T) -> Self { Reply::parameters(Some(serde_json::to_value(a).unwrap())) } } /// Call is a struct, which is passed as the first argument to the interface methods /// in a derived form. /// /// See also the [CallTrait](trait.CallTrait.html) to use with the first Call parameter /// /// If your varlink method is called `TestMethod`, the rust method to be implemented is called /// `test_method`. The first parameter is of type `Call_TestMethod`, which has the method `reply()`. /// /// # Examples /// /// ```rust /// # #![allow(non_camel_case_types)] /// # #![allow(non_snake_case)] /// # use std::io; /// # pub trait VarlinkCallError: varlink::CallTrait {} /// # impl<'a> VarlinkCallError for varlink::Call<'a> {} /// # pub trait Call_TestMethod: VarlinkCallError { /// # fn reply(&mut self) -> varlink::Result<()> { /// # self.reply_struct(varlink::Reply::parameters(None)) /// # } /// # } /// # impl<'a> Call_TestMethod for varlink::Call<'a> {} /// # struct TestService; /// # impl TestService { /// fn test_method(&self, call: &mut Call_TestMethod, /* more arguments */) -> varlink::Result<()> { /// /* ... */ /// return call.reply( /* more arguments */ ); /// } /// # } /// # fn main() {} /// ``` pub struct Call<'a> { pub writer: &'a mut Write, pub request: Option<&'a Request<'a>>, continues: bool, upgraded: bool, } /// CallTrait provides convenience methods for the `Call` struct, which is passed as /// the first argument to the interface methods. /// /// # Examples /// /// For an invalid parameter: /// /// ```rust /// # #![allow(non_camel_case_types)] /// # #![allow(non_snake_case)] /// # use std::io; /// # pub trait VarlinkCallError: varlink::CallTrait {} /// # impl<'a> VarlinkCallError for varlink::Call<'a> {} /// # pub trait Call_TestMethod: VarlinkCallError { /// # fn reply(&mut self) -> varlink::Result<()> { /// # self.reply_struct(varlink::Reply::parameters(None)) /// # } /// # } /// # impl<'a> Call_TestMethod for varlink::Call<'a> {} /// # struct TestService; /// # impl TestService { /// fn test_method(&self, call: &mut Call_TestMethod, testparam: i64) -> varlink::Result<()> { /// match testparam { /// 0 ... 100 => {} /// _ => { /// return call.reply_invalid_parameter("testparam".into()); /// } /// } /// /* ... */ /// Ok(()) /// } /// # } /// # fn main() {} /// ``` /// /// For not yet implemented methods: /// /// ```rust /// # #![allow(non_camel_case_types)] /// # #![allow(non_snake_case)] /// # use std::io; /// # pub trait VarlinkCallError: varlink::CallTrait {} /// # impl<'a> VarlinkCallError for varlink::Call<'a> {} /// # pub trait Call_TestMethodNotImplemented: VarlinkCallError { /// # fn reply(&mut self) -> varlink::Result<()> { /// # self.reply_struct(varlink::Reply::parameters(None)) /// # } /// # } /// # impl<'a> Call_TestMethodNotImplemented for varlink::Call<'a> {} /// # struct TestService; /// # impl TestService { /// fn test_method_not_implemented(&self, call: &mut Call_TestMethodNotImplemented) /// -> varlink::Result<()> { /// return call.reply_method_not_implemented("TestMethodNotImplemented".into()); /// } /// # } /// # fn main() {} /// ``` pub trait CallTrait { /// Don't use this directly. Rather use the standard `reply()` method. fn reply_struct(&mut self, reply: Reply) -> Result<()>; /// Set this to `true` to indicate, that more replies are following. /// /// # Examples /// /// ```rust /// # #![allow(non_camel_case_types)] /// # #![allow(non_snake_case)] /// # use std::io; /// # pub trait VarlinkCallError: varlink::CallTrait {} /// # impl<'a> VarlinkCallError for varlink::Call<'a> {} /// # pub trait Call_TestMethod: VarlinkCallError { /// # fn reply(&mut self) -> varlink::Result<()> { /// # self.reply_struct(varlink::Reply::parameters(None)) /// # } /// # } /// # impl<'a> Call_TestMethod for varlink::Call<'a> {} /// # struct TestService; /// # impl TestService { /// fn test_method(&self, call: &mut Call_TestMethod) -> varlink::Result<()> { /// call.set_continues(true); /// call.reply( /* more args*/ )?; /// call.reply( /* more args*/ )?; /// call.reply( /* more args*/ )?; /// call.set_continues(false); /// return call.reply( /* more args*/ ); /// } /// # } /// # fn main() {} /// ``` fn set_continues(&mut self, cont: bool); fn to_upgraded(&mut self); /// True, if this request does not want a reply. fn is_oneway(&self) -> bool; /// True, if this request accepts more than one reply. fn wants_more(&self) -> bool; fn get_request(&self) -> Option<&Request>; /// reply with the standard varlink `org.varlink.service.MethodNotFound` error fn reply_method_not_found(&mut self, method_name: String) -> Result<()> { self.reply_struct(Reply::error( "org.varlink.service.MethodNotFound", Some( serde_json::to_value(ErrorMethodNotFound { method: Some(method_name), }) .map_err(map_context!())?, ), )) } /// reply with the standard varlink `org.varlink.service.MethodNotImplemented` error fn reply_method_not_implemented(&mut self, method_name: String) -> Result<()> { self.reply_struct(Reply::error( "org.varlink.service.MethodNotImplemented", Some( serde_json::to_value(ErrorMethodNotImplemented { method: Some(method_name), }) .map_err(map_context!())?, ), )) } /// reply with the standard varlink `org.varlink.service.InvalidParameter` error fn reply_invalid_parameter(&mut self, parameter_name: String) -> Result<()> { self.reply_struct(Reply::error( "org.varlink.service.InvalidParameter", Some( serde_json::to_value(ErrorInvalidParameter { parameter: Some(parameter_name), }) .map_err(map_context!())?, ), )) } } impl<'a> CallTrait for Call<'a> { fn reply_struct(&mut self, mut reply: Reply) -> Result<()> { if self.continues && (!self.wants_more()) { Err(context!(ErrorKind::CallContinuesMismatch))?; } if self.continues { reply.continues = Some(true); } // serde_json::to_writer(&mut *self.writer, &reply)?; let b = serde_json::to_string(&reply).map_err(map_context!())? + "\0"; self.writer .write_all(b.as_bytes()) .map_err(map_context!())?; self.writer.flush().map_err(map_context!())?; Ok(()) } fn set_continues(&mut self, cont: bool) { self.continues = cont; } fn to_upgraded(&mut self) { self.upgraded = true; } /// True, if this request does not want a reply. fn is_oneway(&self) -> bool { match self.request { Some(Request { oneway: Some(true), .. }) => true, _ => false, } } /// True, if this request accepts more than one reply. fn wants_more(&self) -> bool { match self.request { Some(Request { more: Some(true), .. }) => true, _ => false, } } fn get_request(&self) -> Option<&Request> { self.request } } impl<'a> Call<'a> { pub fn new(writer: &'a mut Write, request: &'a Request<'a>) -> Self { Call { writer, request: Some(request), continues: false, upgraded: false, } } fn new_upgraded(writer: &'a mut Write) -> Self { Call { writer, request: None, continues: false, upgraded: true, } } pub fn reply_interface_not_found(&mut self, arg: Option<String>) -> Result<()> { self.reply_struct(Reply::error( "org.varlink.service.InterfaceNotFound", match arg { Some(a) => Some( serde_json::to_value(ErrorInterfaceNotFound { interface: Some(a) }) .map_err(map_context!())?, ), None => None, }, )) } fn reply_parameters(&mut self, parameters: Value) -> Result<()> { let reply = Reply::parameters(Some(parameters)); //serde_json::to_writer(&mut *self.writer, &reply)?; let b = serde_json::to_string(&reply).map_err(map_context!())? + "\0"; self.writer .write_all(b.as_bytes()) .map_err(map_context!())?; self.writer.flush().map_err(map_context!())?; Ok(()) } } /// A client connection builder to a varlink service. #[derive(Default)] pub struct Connection { pub reader: Option<BufReader<Box<Read + Send + Sync>>>, pub writer: Option<Box<Write + Send + Sync>>, address: String, #[allow(dead_code)] // For the stream Drop() pub stream: Option<client::VarlinkStream>, pub child: Option<Child>, pub tempdir: Option<TempDir>, } impl Connection { /// Create a connection with a varlink URI /// /// see [with_address](#method.with_address) #[allow(clippy::new_ret_no_self)] pub fn new<S: ?Sized + AsRef<str>>(address: &S) -> Result<Arc<RwLock<Self>>> { Self::with_address(address) } /// Create a connection with a varlink URI /// /// following the varlink /// [address specification](https://github.com/varlink/documentation/wiki#address). /// /// Currently supported address URIs are: /// /// - TCP `tcp:127.0.0.1:12345` hostname/IP address and port /// - UNIX socket `unix:/run/org.example.ftl` /// - UNIX abstract namespace socket `unix:@org.example.ftl` (on Linux only) /// /// # Examples /// /// ```rust,ignore /// let connection = Connection::with_address("unix:/tmp/org.example.myservice"); /// let connection = Connection::with_address("tcp:127.0.0.1:12345"); /// ``` pub fn with_address<S: ?Sized + AsRef<str>>(address: &S) -> Result<Arc<RwLock<Self>>> { let (mut stream, address) = client::VarlinkStream::connect(address)?; let (r, w) = stream.split()?; let bufreader = BufReader::new(r); Ok(Arc::new(RwLock::new(Connection { reader: Some(bufreader), writer: Some(w), address, stream: Some(stream), child: None, tempdir: None, }))) } /// Create a connection to a service, which is executed in the background. /// /// Create a connection to a service, which is started with `command` and passed a socket pair /// via socket activation. The address of the unix socket is set in the environment variable /// `VARLINK_ADDRESS`. Additionally the socket activation variables `LISTEN_FDS=1`, /// `LISTEN_FDNAMES=varlink` and `LISTEN_PID` are set. /// /// # Examples /// /// ```rust,ignore /// let connection = Connection::with_activate("myservice --varlink=$VARLINK_ADDRESS"); /// ``` pub fn with_activate<S: ?Sized + AsRef<str>>(command: &S) -> Result<Arc<RwLock<Self>>> { let (child, unix_address, temp_dir) = varlink_exec(command)?; let (mut stream, address) = client::VarlinkStream::connect(&unix_address)?; let (reader, writer) = stream.split()?; let bufreader = BufReader::new(reader); Ok(Arc::new(RwLock::new(Connection { reader: Some(bufreader), writer: Some(writer), address, stream: Some(stream), child: Some(child), tempdir: temp_dir, }))) } /// Create a connection to a service via stdin/stdout of a specified command. /// /// Create a "bridge" to e.g. another host via `ssh` or other connection commands. /// On the remote side `varlink bridge` is typically started. /// The connection will go through stdin/stdout of the command and the remote bridge command /// will multiplex to the wanted varlink services. /// /// Of course with `ssh` there are better options, like unix socket /// forwarding `-L local_socket:remote_socket`. /// /// # Examples /// /// ```rust,ignore /// let connection = Connection::with_bridge("ssh my.example.org -- varlink bridge"); /// ``` pub fn with_bridge<S: ?Sized + AsRef<str>>(command: &S) -> Result<Arc<RwLock<Self>>> { let (child, mut stream) = varlink_bridge(command)?; let (r, w) = stream.split()?; let bufreader = BufReader::new(r); Ok(Arc::new(RwLock::new(Connection { reader: Some(bufreader), writer: Some(w), address: "bridge".into(), stream: Some(stream), child: Some(child), tempdir: None, }))) } /// Return the `address` used by the connection. /// /// Only useful, if you want to clone a connection built /// [with_activate](#method.with_activate) or [with_address](#method.with_address) pub fn address(&self) -> String { self.address.clone() } } impl Drop for Connection { fn drop(&mut self) { if let Some(ref mut stream) = self.stream { let _r = stream.shutdown(); } /* if let Some(ref mut child) = self.child { let _res = child.kill(); let _res = child.wait(); } */ if self.tempdir.is_some() { if let Some(dir) = self.tempdir.take() { use std::fs; let _r = fs::remove_dir_all(dir); } } } } pub struct MethodCall<MRequest, MReply, MError> where MRequest: Serialize, MReply: DeserializeOwned, MError: From<Error>, { connection: Arc<RwLock<Connection>>, request: Option<MRequest>, method: Option<Cow<'static, str>>, reader: Option<BufReader<Box<Read + Send + Sync>>>, writer: Option<Box<Write + Send + Sync>>, continues: bool, phantom_reply: PhantomData<MReply>, phantom_error: PhantomData<MError>, } impl<MRequest, MReply, MError> Iterator for MethodCall<MRequest, MReply, MError> where MRequest: Serialize, MReply: DeserializeOwned, MError: From<Error>, { type Item = std::result::Result<MReply, MError>; fn next(&mut self) -> Option<std::result::Result<MReply, MError>> { if !self.continues { return None; } Some(self.recv()) } } impl<MRequestParameters, MReply, MError> MethodCall<MRequestParameters, MReply, MError> where MRequestParameters: Serialize, MReply: DeserializeOwned, MError: From<Error>, { pub fn new<S: Into<Cow<'static, str>>>( connection: Arc<RwLock<Connection>>, method: S, parameters: MRequestParameters, ) -> Self { MethodCall::<MRequestParameters, MReply, MError> { connection, request: Some(parameters), method: Some(method.into()), continues: false, reader: None, writer: None, phantom_reply: PhantomData, phantom_error: PhantomData, } } fn send(&mut self, oneway: bool, more: bool, upgrade: bool) -> std::result::Result<(), MError> { { let mut conn = self.connection.write().unwrap(); let mut req = match (self.method.take(), self.request.take()) { (Some(method), Some(request)) => Request::create( method, Some( serde_json::to_value(request) .map_err(map_context!()) .map_err(Error::from)?, ), ), _ => { return Err(MError::from(Error::from(context!( ErrorKind::MethodCalledAlready )))); } }; if conn.reader.is_none() || conn.writer.is_none() { return Err(Error::from(context!(ErrorKind::ConnectionBusy)).into()); } if oneway { req.oneway = Some(true); } else { self.reader = conn.reader.take(); } if more { req.more = Some(true); } if upgrade { req.upgrade = Some(true); } let mut w = conn.writer.take().unwrap(); let b = serde_json::to_string(&req) .map_err(map_context!()) .map_err(Error::from)? + "\0"; w.write_all(b.as_bytes()) .map_err(map_context!()) .map_err(Error::from)?; w.flush() .map_err(map_context!()) .map_err(Error::from)?; if oneway { conn.writer = Some(w); } else { self.writer = Some(w); } } Ok(()) } pub fn call(&mut self) -> std::result::Result<MReply, MError> { self.send(false, false, false)?; self.recv() } pub fn upgrade(&mut self) -> std::result::Result<MReply, MError> { self.send(false, false, true)?; self.recv() } pub fn oneway(&mut self) -> std::result::Result<(), MError> { self.send(true, false, false) } pub fn more(&mut self) -> std::result::Result<&mut Self, MError> { self.continues = true; self.send(false, true, false)?; Ok(self) } pub fn recv(&mut self) -> std::result::Result<MReply, MError> { if self.reader.is_none() || self.writer.is_none() { return Err(Error::from(context!(ErrorKind::IteratorOldReply)).into()); } let mut buf = Vec::new(); let mut reader = self.reader.take().unwrap(); reader .read_until(0, &mut buf) .map_err(map_context!()) .map_err(Error::from)?; self.reader = Some(reader); if buf.is_empty() { return Err(Error::from(context!(ErrorKind::ConnectionClosed)).into()); } buf.pop(); let reply: Reply = serde_json::from_slice(&buf) .map_err(map_context!()) .map_err(Error::from)?; match reply.continues { Some(true) => self.continues = true, _ => { self.continues = false; let mut conn = self.connection.write().unwrap(); conn.reader = self.reader.take(); conn.writer = self.writer.take(); } } if reply.error != None { return Err(Error::from(context!(ErrorKind::from(reply))).into()); } match reply { Reply { parameters: Some(p), .. } => { let mreply: MReply = serde_json::from_value(p) .map_err(map_context!()) .map_err(Error::from)?; Ok(mreply) } Reply { parameters: None, .. } => { let mreply: MReply = serde_json::from_value(serde_json::Value::Object(serde_json::Map::new())) .map_err(map_context!()) .map_err(Error::from)?; Ok(mreply) } } } } #[derive(Serialize, Deserialize, Debug, PartialEq, Default, Clone)] pub struct GetInterfaceDescriptionArgs<'a> { pub interface: Cow<'a, str>, } #[derive(Serialize, Deserialize, Debug, PartialEq, Default, Clone)] pub struct ServiceInfo { pub vendor: Cow<'static, str>, pub product: Cow<'static, str>, pub version: Cow<'static, str>, pub url: Cow<'static, str>, pub interfaces: Vec<Cow<'static, str>>, } #[derive(Serialize, Deserialize, Debug, PartialEq, Default, Clone)] pub struct GetInfoArgs; #[derive(Serialize, Deserialize, Debug, PartialEq, Default, Clone)] pub struct GetInterfaceDescriptionReply { #[serde(skip_serializing_if = "Option::is_none")] pub description: Option<String>, } impl VarlinkReply for GetInterfaceDescriptionReply {} pub struct OrgVarlinkServiceClient { connection: Arc<RwLock<Connection>>, } impl OrgVarlinkServiceClient { pub fn new(connection: Arc<RwLock<Connection>>) -> Self { OrgVarlinkServiceClient { connection } } } pub trait OrgVarlinkServiceInterface { fn get_info(&mut self) -> Result<ServiceInfo>; fn get_interface_description<S: Into<Cow<'static, str>>>( &mut self, interface: S, ) -> Result<GetInterfaceDescriptionReply>; } impl OrgVarlinkServiceInterface for OrgVarlinkServiceClient { fn get_info(&mut self) -> Result<ServiceInfo> { MethodCall::<GetInfoArgs, ServiceInfo, Error>::new( self.connection.clone(), "org.varlink.service.GetInfo", GetInfoArgs {}, ) .call() } fn get_interface_description<S: Into<Cow<'static, str>>>( &mut self, interface: S, ) -> Result<GetInterfaceDescriptionReply> { MethodCall::<GetInterfaceDescriptionArgs, GetInterfaceDescriptionReply, Error>::new( self.connection.clone(), "org.varlink.service.GetInterfaceDescription", GetInterfaceDescriptionArgs { interface: interface.into(), }, ) .call() } } /// VarlinkService handles all the I/O and dispatches method calls to the registered interfaces. pub struct VarlinkService { info: ServiceInfo, ifaces: HashMap<Cow<'static, str>, Box<Interface + Send + Sync>>, } impl Interface for VarlinkService { fn get_description(&self) -> &'static str { r#"# The Varlink Service Interface is provided by every varlink service. It # describes the service and the interfaces it implements. interface org.varlink.service # Get a list of all the interfaces a service provides and information # about the implementation. method GetInfo() -> ( vendor: string, product: string, version: string, url: string, interfaces: []string ) # Get the description of an interface that is implemented by this service. method GetInterfaceDescription(interface: string) -> (description: string) # The requested interface was not found. error InterfaceNotFound (interface: string) # The requested method was not found error MethodNotFound (method: string) # The interface defines the requested method, but the service does not # implement it. error MethodNotImplemented (method: string) # One of the passed parameters is invalid. error InvalidParameter (parameter: string) "# } fn get_name(&self) -> &'static str { "org.varlink.service" } fn call_upgraded(&self, call: &mut Call, _bufreader: &mut BufRead) -> Result<Vec<u8>> { call.upgraded = false; Ok(Vec::new()) } fn call(&self, call: &mut Call) -> Result<()> { // call.request starts at least with "org.varlink.service." let req = call.request.unwrap(); match req { Request { method: ref m, .. } if m == "org.varlink.service.GetInfo" => call .reply_parameters( serde_json::to_value(&self.info).map_err(map_context!())?, ), Request { method: ref m, parameters: Some(params), .. } if m == "org.varlink.service.GetInterfaceDescription" => { let args: GetInterfaceDescriptionArgs = serde_json::from_value(params.clone()).map_err(map_context!())?; match args.interface.as_ref() { "org.varlink.service" => { call.reply_parameters(json!({"description": self.get_description()})) } key if self.ifaces.contains_key(key) => call.reply_parameters( json!({"description": self.ifaces[key].get_description()}), ), _ => call.reply_invalid_parameter("interface".into()), } } Request { method: ref m, parameters: None, .. } if m == "org.varlink.service.GetInterfaceDescription" => { call.reply_invalid_parameter("parameters".into()) } Request { method: m, .. } => call.reply_method_not_found(m.to_string()), } } } impl VarlinkService { /// Create a new `VarlinkService`. /// /// See the [Service](https://github.com/varlink/documentation/wiki/Service) section of the /// varlink wiki about the `vendor`, `product`, `version` and `url`. /// /// The `interfaces` vector is an array of varlink `Interfaces` this service provides. /// /// # Examples /// /// ```rust /// # use std::io; /// # struct Interface; /// # impl varlink::Interface for Interface { /// # fn get_description(&self) -> &'static str { /// # "interface org.example.ping\nmethod Ping(ping: string) -> (pong: string)" } /// # fn get_name(&self) -> &'static str { "org.example.ping" } /// # fn call_upgraded(&self, call: &mut varlink::Call, _bufreader: &mut io::BufRead) -> /// # varlink::Result<Vec<u8>> { Ok(Vec::new()) } /// # fn call(&self, call: &mut varlink::Call) -> varlink::Result<()> { Ok(()) } /// # } /// # fn main_f() { /// # let interface_foo = Interface{}; /// # let interface_bar = Interface{}; /// # let interface_baz = Interface{}; /// let service = varlink::VarlinkService::new( /// "org.varlink", /// "test service", /// "0.1", /// "http://varlink.org", /// vec![ /// Box::new(interface_foo), /// Box::new(interface_bar), /// Box::new(interface_baz), /// ], /// ); /// # } /// # fn main() {} /// ``` pub fn new<S: Into<Cow<'static, str>>>( vendor: S, product: S, version: S, url: S, interfaces: Vec<Box<Interface + Send + Sync>>, ) -> Self { let mut ifhashmap = HashMap::<Cow<'static, str>, Box<Interface + Send + Sync>>::new(); for i in interfaces { ifhashmap.insert(i.get_name().into(), i); } let mut ifnames: Vec<Cow<'static, str>> = Vec::new(); ifnames.push("org.varlink.service".into()); ifnames.extend(ifhashmap.keys().cloned()); VarlinkService { info: ServiceInfo { vendor: vendor.into(), product: product.into(), version: version.into(), url: url.into(), interfaces: ifnames, }, ifaces: ifhashmap, } } fn call(&self, iface: &str, call: &mut Call) -> Result<()> { match iface { "org.varlink.service" => self::Interface::call(self, call), key => { if self.ifaces.contains_key(key) { self.ifaces[key].call(call) } else { call.reply_interface_not_found(Some(iface.into())) } } } } fn call_upgraded( &self, iface: &str, call: &mut Call, bufreader: &mut BufRead, ) -> Result<Vec<u8>> { match iface { "org.varlink.service" => self::Interface::call_upgraded(self, call, bufreader), key => { if self.ifaces.contains_key(key) { self.ifaces[key].call_upgraded(call, bufreader) } else { call.reply_interface_not_found(Some(iface.into()))?; Ok(Vec::new()) } } } } } pub trait ConnectionHandler { fn handle( &self, bufreader: &mut BufRead, writer: &mut Write, upgraded_iface: Option<String>, ) -> Result<(Vec<u8>, Option<String>)>; } impl ConnectionHandler for VarlinkService { /// ```handle()``` consumes every null terminated message from ```reader``` /// and writes the reply to ```writer```. /// /// This method can be used to implement your own server. /// Pass it one or more null terminated received messages in a ```BufReader``` and reply to the /// sender with the filled ```writer``` buffer. /// /// Returns Ok(true), if the connection is ```upgraded```. For ```upgraded``` connections /// messages are in legacy format and /// /// # Examples // /// ```rust /// # #![allow(non_camel_case_types)] /// # #![allow(non_snake_case)] /// # use std::io; /// use varlink::{ConnectionHandler, VarlinkService}; // /// # fn main_func() { /// let service = VarlinkService::new( /// "org.varlink", /// "test service", /// "0.1", /// "http://varlink.org", /// vec![], // more interfaces ... /// ); /// let mut in_buf = io::BufReader::new("received null terminated message(s) go here \000".as_bytes()); /// let mut out: Vec<u8> = Vec::new(); /// assert!(service.handle(&mut in_buf, &mut out, None).is_ok()); /// # } /// # fn main() {} fn handle( &self, bufreader: &mut BufRead, writer: &mut Write, upgraded_last_interface: Option<String>, ) -> Result<(Vec<u8>, Option<String>)> { let mut upgraded_iface = upgraded_last_interface.clone(); loop { if let Some(iface) = upgraded_iface { let mut call = Call::new_upgraded(writer); let unread = self.call_upgraded(&iface, &mut call, bufreader)?; return Ok((unread, Some(iface))); } let mut buf = Vec::new(); let len = bufreader .read_until(b'\0', &mut buf) .map_err(map_context!())?; if len == 0 { // EOF return Ok((buf, None)); } if buf.get(len - 1).unwrap_or(&b'x') != &b'\0' { // Incomplete message return Ok((buf, None)); } // pop the last zero byte buf.pop(); let req: Request = serde_json::from_slice(&buf).map_err(|e| { context!( e, ErrorKind::SerdeJsonDe(String::from_utf8_lossy(&buf).to_string()) ) })?; let n: usize = match req.method.rfind('.') { None => { let method: String = String::from(req.method.as_ref()); let mut call = Call::new(writer, &req); call.reply_interface_not_found(Some(method))?; return Ok((Vec::new(), None)); } Some(x) => x, }; let iface = String::from(&req.method[..n]); let mut call = Call::new(writer, &req); self.call(&iface, &mut call)?; if call.upgraded { upgraded_iface = Some(iface); break; } } #[cfg(any(feature = "bufreader_buffer", feature = "nightly"))] return Ok((bufreader.buffer(), upgraded_iface)); #[cfg(not(any(feature = "bufreader_buffer", feature = "nightly")))] return Ok((Vec::new(), upgraded_iface)); } }