Upgrade to openmetrics parser 0.4.1

This contains a fix for #17, allowing empty metric sets to be parsed

Signed-off-by: sinkingpoint <colin@quirl.co.nz>

Cargo.toml

@@ -14,7 +14,7 @@ keywords = ["openmetrics", "prometheus", "pushgateway"]
 [dependencies]
 tokio = { version = "1", features = ["full"] }
 warp = "0.3"
-openmetrics-parser = "0.4.0"
+openmetrics-parser = "0.4.1"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 clap = "2.33.3"

src/aggregator_test.rs

@@ -150,3 +150,19 @@ async fn test_push_with_different_label_names() {
     assert!(agg.parse_and_merge("requests_num_total2{clearmode=\"mean5m\"} 1\n", &HashMap::new()).await.is_ok(), "failed to add metric with clearmode");
     assert!(agg.parse_and_merge("requests_num_total2{clearmode=\"mean5m\"} 1\n", &HashMap::new()).await.is_ok(), "failed to add second metric with clearmode");
 }
+
+#[tokio::test]
+async fn test_17() {
+    let mut agg = Aggregator::new();
+    let result = agg.parse_and_merge("# HELP metric_without_values_total This metric does not always have values
+# TYPE metric_without_values_total counter
+# HELP metric_with_values_total This metric will always have values
+# TYPE metric_with_values_total counter
+metric_with_values_total{a_label=\"label_value\",another_label=\"a_value\"} 1.0
+# HELP metric_with_values_created This metric will always have values
+# TYPE metric_with_values_created gauge
+metric_with_values_created{a_label=\"label_value\",another_label=\"a_value\"} 1.665577650707084e+09
+", &HashMap::new()).await;
+
+    assert!(result.is_ok(), "failed to parse valid metric: {:?}", result.err());
+}