diff options
Diffstat (limited to 'src/source.rs')
-rw-r--r-- | src/source.rs | 58 |
1 files changed, 52 insertions, 6 deletions
diff --git a/src/source.rs b/src/source.rs index dc5f3b5..831e4c4 100644 --- a/src/source.rs +++ b/src/source.rs @@ -2,6 +2,8 @@ use std::collections::HashMap; use std::fmt::Debug; use std::str::FromStr; +use async_trait::async_trait; + use crate::error::*; use crate::path; use crate::value::{Value, ValueKind}; @@ -14,21 +16,65 @@ pub trait Source: Debug { /// a HashMap. fn collect(&self) -> Result<HashMap<String, Value>>; + /// Collects all configuration properties to a provided cache. fn collect_to(&self, cache: &mut Value) -> Result<()> { self.collect()? .iter() - .for_each(|(key, val)| match path::Expression::from_str(key) { - // Set using the path - Ok(expr) => expr.set(cache, val.clone()), + .for_each(|(key, val)| set_value(cache, key, val)); - // Set diretly anyway - _ => path::Expression::Identifier(key.clone()).set(cache, val.clone()), - }); + Ok(()) + } +} + +fn set_value(cache: &mut Value, key: &str, value: &Value) { + match path::Expression::from_str(key) { + // Set using the path + Ok(expr) => expr.set(cache, value.clone()), + + // Set diretly anyway + _ => path::Expression::Identifier(key.to_string()).set(cache, value.clone()), + } +} + +/// Describes a generic _source_ of configuration properties capable of using an async runtime. +/// +/// At the moment this library does not implement it, although it allows using its implementations +/// within builders. Due to the scattered landscape of asynchronous runtimes, it is impossible to +/// cater to all needs with one implementation. Also, this trait might be most useful with remote +/// configuration sources, reachable via the network, probably using HTTP protocol. Numerous HTTP +/// libraries exist, making it even harder to find one implementation that rules them all. +/// +/// For those reasons, it is left to other crates to implement runtime-specific or proprietary +/// details. +/// +/// It is advised to use `async_trait` crate while implementing this trait. +/// +/// See examples for sample implementation. +#[async_trait] +pub trait AsyncSource: Debug + Sync { + // Sync is supertrait due to https://docs.rs/async-trait/0.1.50/async_trait/index.html#dyn-traits + + /// Collects all configuration properties available from this source and return + /// a HashMap as an async operations. + async fn collect(&self) -> Result<HashMap<String, Value>>; + + /// Collects all configuration properties to a provided cache. + async fn collect_to(&self, cache: &mut Value) -> Result<()> { + self.collect() + .await? + .iter() + .for_each(|(key, val)| set_value(cache, key, val)); Ok(()) } } +impl Clone for Box<dyn AsyncSource + Send + Sync> { + fn clone(&self) -> Self { + self.to_owned() + } +} + impl Clone for Box<dyn Source + Send + Sync> { fn clone(&self) -> Box<dyn Source + Send + Sync> { self.clone_into_box() |