allow reading arbitrary value

waybar-collectd/src/config.rs

@@ -17,14 +17,86 @@ pub struct GraphConfig {
     pub series: Vec<SeriesConfig>,
 }
 
+#[derive(PartialEq, Debug, Deserialize)]
+pub struct MetricSpecification {
+    pub name: String,
+    pub value: String,
+}
+
 #[derive(Debug, Deserialize)]
+#[serde(untagged)]
+enum MetricInput {
+    String(String),
+    Struct { name: String, value: String },
+}
+
+impl MetricInput {
+    fn into_metric(self) -> MetricSpecification {
+        match self {
+            MetricInput::String(name) => MetricSpecification {
+                name,
+                value: "value".to_string(),
+            },
+            MetricInput::Struct { name, value } => MetricSpecification { name, value },
+        }
+    }
+}
+
+fn deserialize_metrics<'de, D>(deserializer: D) -> Result<Vec<MetricSpecification>, D::Error>
+where
+    D: serde::Deserializer<'de>,
+{
+    let inputs = Vec::<MetricInput>::deserialize(deserializer)?;
+    Ok(inputs.into_iter().map(|m| m.into_metric()).collect())
+}
+
+#[derive(PartialEq, Debug, Deserialize)]
 pub struct SeriesConfig {
     pub name: String,
     pub color: (u8, u8, u8),
-    pub metrics: Vec<String>,
+
+    #[serde(deserialize_with = "deserialize_metrics")]
+    pub metrics: Vec<MetricSpecification>,
 }
 
 pub fn parse(path: &str) -> Config {
     let file = fs::read_to_string(path).expect("Could not open configuration file");
     toml::from_str(&file).expect("Could not parse configuration file")
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn test_parse_metrics() {
+        let parsed: SeriesConfig = toml::from_str(
+            "name = 'hello world'
+            color = [0, 0, 0]
+            metrics = [
+                'm1',
+                { name = 'm2', value = 'modified'},
+                
+            ]",
+        )
+        .unwrap();
+
+        let expected_metrics = vec![
+            MetricSpecification {
+                name: "m1".to_string(),
+                value: "value".to_string(),
+            },
+            MetricSpecification {
+                name: "m2".to_string(),
+                value: "modified".to_string(),
+            },
+        ];
+        let expected = SeriesConfig {
+            name: "hello world".to_string(),
+            color: (0, 0, 0),
+            metrics: expected_metrics,
+        };
+
+        assert_eq!(parsed, expected);
+    }
+}

waybar-collectd/src/observables.rs

@@ -1,21 +1,51 @@
 use protocol::{Protocol, ProtocolError};
 use regex::Regex;
 
+use crate::config::MetricSpecification;
+
 pub struct Observable {
     pub name: String,
-    metrics: Vec<String>,
+    metrics: Vec<Metric>,
+}
+
+struct MetricRegex {
+    pub name_regex: Regex,
+    pub value: String,
+}
+
+struct Metric {
+    pub metric_name: String,
+    pub value_name: String,
 }
 
 impl Observable {
     pub fn discover(
         proto: &mut Protocol,
         name: &str,
-        includes: &Vec<Regex>,
+        includes: &Vec<MetricSpecification>,
     ) -> Result<Observable, ProtocolError> {
         let all_values = proto.list()?;
+        let regexes: Vec<MetricRegex> = includes
+            .iter()
+            .map(|i| MetricRegex {
+                name_regex: Regex::new(&i.name).unwrap(),
+                value: i.value.to_string(),
+            })
+            .collect();
         let filtered_values = all_values
             .into_iter()
-            .filter(|v| includes.iter().any(|i| i.is_match(v)))
+            .filter_map(|v| {
+                for r in regexes.iter() {
+                    if r.name_regex.is_match(&v) {
+                        return Some(Metric {
+                            metric_name: v,
+                            value_name: r.value.to_string(),
+                        });
+                    }
+                }
+
+                None
+            })
             .collect();
 
         Ok(Observable {
@@ -28,7 +58,7 @@ impl Observable {
         let results = self
             .metrics
             .iter()
-            .map(|f| proto.get(f.into(), "value".to_string()))
+            .map(|f| proto.get(f.metric_name.to_string(), f.value_name.to_string()))
             .collect::<Result<Vec<f32>, ProtocolError>>()?;
 
         Ok(results.into_iter().sum::<f32>())

waybar-collectd/src/runner.rs

@@ -2,7 +2,6 @@ use core::fmt;
 
 use draw::{StackedConfig, StackedSeries, StackedSeriesConfig, stacked};
 use protocol::{Protocol, ProtocolError};
-use regex::Regex;
 
 use crate::{
     config::GraphConfig,
@@ -33,13 +32,7 @@ impl Graph {
             config
                 .series
                 .iter()
-                .map(|s| {
-                    Observable::discover(
-                        proto,
-                        &s.name,
-                        &s.metrics.iter().map(|m| Regex::new(&m).unwrap()).collect(),
-                    )
-                })
+                .map(|s| Observable::discover(proto, &s.name, &s.metrics))
                 .collect::<Result<Vec<Observable>, ProtocolError>>()
                 .expect("Could not discover required metrics"),
         );