Resolve "feat: raw json (string or serde_json::Value) instead of structs"

Closes #14 (closed)

This MR adds the query_raw method which directly returns reqwest::Response. This gives the user control over how they want to handle the response, instead of de-serializing it by default.

src/lib.rs

@@ -12,7 +12,7 @@ use std::fmt::Display;
 use prometheus_http_query::Client;
 use query::{ops::Operable, IntoQuery};
 use reqwest::header::HeaderValue;
-use result::{IntoQryResult, QryResult};
+use result::{IntoResult, QryResult, RawResult};
 use seal::Sealed;
 use url::Url;
 
@@ -86,8 +86,28 @@ impl QueryManager {
             builder = builder.timeout(*timeout);
         }
         match self.method {
-            Method::Get => builder.get().await.into_qry_result(),
-            Method::Post => builder.post().await.into_qry_result(),
+            Method::Get => builder.get().await.into_result(),
+            Method::Post => builder.post().await.into_result(),
+        }
+    }
+
+    /// Send a query to the Prometheus server and retreive raw response ([`reqwest::Response`])
+    ///
+    /// This method accepts any type that implements the `IntoQuery` trait.
+    /// The trait is implemented for `&str`, `String`, `&String`, and __mquery's__
+    /// internal types such as [`query::Metric`], [`query::Scalar`] and others that result
+    /// from the query builder API.
+    pub async fn query_raw<Q: IntoQuery>(&self, query: Q) -> RawResult {
+        let mut builder = self.client.query(query.into_query().as_ref());
+        if let Some((name, val)) = self.auth.get_header() {
+            builder = builder.header(name, val);
+        }
+        if let Some(timeout) = self.timeout.as_ref() {
+            builder = builder.timeout(*timeout);
+        }
+        match self.method {
+            Method::Get => builder.get_raw().await.into_result(),
+            Method::Post => builder.post_raw().await.into_result(),
         }
     }
 
@@ -146,8 +166,8 @@ impl QueryManager {
             builder = builder.timeout(*timeout);
         }
         match self.method {
-            Method::Get => builder.get().await.into_qry_result(),
-            Method::Post => builder.post().await.into_qry_result(),
+            Method::Get => builder.get().await.into_result(),
+            Method::Post => builder.post().await.into_result(),
         }
     }
 }