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use crate::{Message, MessageType, BusName, Path, Interface, Member};
#[derive(Clone, Debug, Default)]
/// A "match rule", that can match Messages on its headers.
///
/// A field set to "None" means no filter for that header,
/// a field set to "Some(_)" must match exactly.
pub struct MatchRule<'a> {
/// Match on message type (you typically want to do this)
pub msg_type: Option<MessageType>,
/// Match on message sender
pub sender: Option<BusName<'a>>,
/// Match on message object path
pub path: Option<Path<'a>>,
/// Match on message interface
pub interface: Option<Interface<'a>>,
/// Match on message member (signal or method name)
pub member: Option<Member<'a>>,
_more_fields_may_come: (),
}
fn msg_type_str(m: MessageType) -> &'static str {
use MessageType::*;
match m {
Signal => "signal",
MethodCall => "method_call",
MethodReturn => "method_return",
Error => "error",
Invalid => unreachable!(),
}
}
impl<'a> MatchRule<'a> {
/// Make a string which you can use in the call to "add_match".
///
/// Panics: if msg_type is set to Some(MessageType::Invalid)
pub fn match_str(&self) -> String {
let mut v = vec!();
if let Some(x) = self.msg_type { v.push(("type", msg_type_str(x))) };
if let Some(ref x) = self.sender { v.push(("sender", &x)) };
if let Some(ref x) = self.path { v.push(("path", &x)) };
if let Some(ref x) = self.interface { v.push(("interface", &x)) };
if let Some(ref x) = self.member { v.push(("member", &x)) };
// For now we don't need to worry about internal quotes in strings as those are not valid names.
// If we start matching against arguments, we need to worry.
let v: Vec<_> = v.into_iter().map(|(k, v)| format!("{}='{}'", k, v)).collect();
v.join(",")
}
/// Returns whether or not the message matches the rule.
pub fn matches(&self, msg: &Message) -> bool {
if let Some(x) = self.msg_type { if x != msg.msg_type() { return false; }};
if self.sender.is_some() && msg.sender() != self.sender { return false };
if self.path.is_some() && msg.path() != self.path { return false };
if self.interface.is_some() && msg.interface() != self.interface { return false };
if self.member.is_some() && msg.member() != self.member { return false };
true
}
/// Create a new struct which matches every message.
pub fn new() -> Self { Default::default() }
/// Returns a clone with no static references
pub fn into_static(&self) -> MatchRule<'static> {
MatchRule {
msg_type: self.msg_type,
sender: self.sender.as_ref().map(|x| x.clone().into_static()),
path: self.path.as_ref().map(|x| x.clone().into_static()),
interface: self.interface.as_ref().map(|x| x.clone().into_static()),
member: self.member.as_ref().map(|x| x.clone().into_static()),
_more_fields_may_come: (),
}
}
}
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