remove unneeded deps

prom-client/Cargo.toml

@@ -11,7 +11,6 @@ async-trait = { workspace = true }
 chrono = { workspace = true }
 displaydoc = { workspace = true }
 reqwest = { workspace = true }
-rust_decimal = { workspace = true }
 serde = { workspace = true }
 tracing = { workspace = true }
 url = { workspace = true }

prom-client/src/lib.rs

@@ -29,7 +29,7 @@ pub use labels::{ExtractLabels, Labels};
 mod messages;
 use messages::PromResponse;
 pub use messages::{
-    AlertInfo, AlertStatus, AlertsResponse, MetricTimeseries, MetricValue, PromData,
+    AlertInfo, AlertStatus, AlertsResponse, MetricTimeseries, MetricVal, MetricValue, PromData,
 };
 
 #[cfg(feature = "plot")]

prom-client/src/messages.rs

@@ -26,11 +26,38 @@
 
 use crate::Error;
 use chrono::{DateTime, Utc};
-use rust_decimal::Decimal;
-use serde::{Deserialize, de::DeserializeOwned};
-use std::{collections::HashMap, fmt::Debug};
+use serde::{Deserialize, Deserializer, de::DeserializeOwned};
+use std::{collections::HashMap, fmt::{self, Debug, Display}};
 use tracing::warn;
 
+/// Wrapper for f64 that deserializes from a string (prometheus returns numeric values as strings)
+#[derive(Clone, Copy, Debug)]
+pub struct MetricVal(pub f64);
+
+impl Display for MetricVal {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        Display::fmt(&self.0, f)
+    }
+}
+
+impl AsRef<f64> for MetricVal {
+    fn as_ref(&self) -> &f64 {
+        &self.0
+    }
+}
+
+impl<'de> Deserialize<'de> for MetricVal {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let s = <&str>::deserialize(deserializer)?;
+        s.parse::<f64>()
+            .map(MetricVal)
+            .map_err(serde::de::Error::custom)
+    }
+}
+
 #[derive(Clone, Debug, Deserialize)]
 #[serde(bound = "KV: DeserializeOwned")]
 pub struct MetricValue<KV = HashMap<String, String>>
@@ -39,7 +66,7 @@ where
 {
     pub metric: KV,
     #[serde(default)]
-    pub value: Option<(f64, Decimal)>,
+    pub value: Option<(f64, MetricVal)>,
     // TODO: Include histograms
 }
 
@@ -51,7 +78,7 @@ where
 {
     pub metric: KV,
     #[serde(default)]
-    pub values: Vec<(f64, Decimal)>,
+    pub values: Vec<(f64, MetricVal)>,
     // TODO: Include histograms
 }
 

prom-client/src/plot.rs

@@ -1,7 +1,6 @@
 use crate::{ExtractLabels, MetricTimeseries};
 use chrono::{DateTime, FixedOffset, TimeZone, Utc};
 use plotters::prelude::*;
-use rust_decimal::prelude::ToPrimitive;
 use std::{
     borrow::Borrow,
     error::Error,
@@ -235,7 +234,7 @@ impl PreparedPlot {
                     .iter()
                     .filter_map(|(k, v)| {
                         let x = f64_to_datetime(k)?;
-                        let y = v.to_f64()?;
+                        let y = *v.as_ref();
                         extend_range(&mut x_range, &x);
                         extend_range(&mut y_range, &y);