Merge branch '20-feat-initial-implementation-of-promql-macro-for-validation' into 'main'

Feat: initial implementation of promql macro for validation

Closes #20

See merge request !10

Cargo.toml

@@ -13,11 +13,13 @@ url = "2.5.0"
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 [dev-dependencies]
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mquery-macros/Cargo.toml

+[package]
+name = "mquery-macros"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+promql-parser = "0.3.1"
+quote = "1.0.33"
+
+[lib]
+proc-macro = true

mquery-macros/src/lib.rs

+extern crate proc_macro;
+
+use proc_macro::TokenStream;
+use quote::quote;
+
+/// Compile time validation of PromQL queries
+///
+/// The macro takes a query as input (unquoted), and returns a `ValidatedQuery<&'static str>` if it's valid
+/// or generates a compiler error based on what's wrong with the provided query.
+///
+/// Note, in its current implementation, the macro is recommended only for development purposes.
+///
+/// # Example
+/// ```
+/// let query = promql!(sum(http_requests)); // returns `ValidatedQuery<&str>`
+/// ```
+#[proc_macro]
+pub fn promql(stream: TokenStream) -> TokenStream {
+    let query = stream.to_string();
+    match promql_parser::parser::parse(&query) {
+        Ok(_) => quote!(::mquery::ValidatedQuery(#query)).into(),
+        Err(e) => quote!(compile_error!(#e)).into(),
+    }
+}

src/lib.rs

 #![doc = include_str!("../README.md")]
 
+#[cfg(feature = "macros")]
+pub mod macros;
 pub mod query;
 pub mod result;
 #[cfg(feature = "utils")]
 pub mod utils;
 
+use std::fmt::Display;
+
 use prometheus_http_query::Client;
-use query::IntoQuery;
+use query::{ops::Operable, IntoQuery};
 use reqwest::header::HeaderValue;
 use result::{IntoQryResult, QryResult};
+use seal::Sealed;
 use url::Url;
 
 /// The primary way to send queries and get deserialized responses from the metrics server
@@ -156,3 +161,24 @@ pub enum Method {
 mod seal {
     pub trait Sealed {}
 }
+
+/// Signifies that a query has been validated through some of the validation methods
+/// offered by the library
+pub struct ValidatedQuery<T: AsRef<str>>(pub T);
+
+impl<T: AsRef<str>> IntoQuery for ValidatedQuery<T> {
+    type Target = T;
+
+    fn into_query(self) -> Self::Target {
+        self.0
+    }
+}
+
+impl<T: AsRef<str>> Display for ValidatedQuery<T> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        self.0.as_ref().fmt(f)
+    }
+}
+
+impl<T: AsRef<str>> Operable for ValidatedQuery<T> {}
+impl<T: AsRef<str>> Sealed for ValidatedQuery<T> {}

src/macros.rs

+//! Dealing with queries with compile-time magic
+//!
+//! Enable this module with the feature flag `macros`
+
+pub use mquery_macros::promql;