feat(new encoding): add pretty json encoding

changelog.d/20384_pretty_json_config.enhancement.md

@@ -0,0 +1,3 @@
+Add `use_pretty_json` option to json coded to output a prettified json format.
+
+authors: lsampras

config/vector.yaml

@@ -38,6 +38,8 @@ sinks:
     inputs: ["parse_logs"]
     encoding:
       codec: "json"
+      json:
+        use_pretty_json: true
 
 # Vector's GraphQL API (disabled by default)
 # Uncomment to try it out with the `vector top` command or

lib/codecs/src/encoding/format/json.rs

@@ -14,17 +14,33 @@ pub struct JsonSerializerConfig {
     /// metric.  When set to `full`, all metric tags are exposed as separate assignments.
     #[serde(default, skip_serializing_if = "vector_core::serde::is_default")]
     pub metric_tag_values: MetricTagValues,
+
+    /// Options for the JsonSerializer.
+    #[serde(default, rename = "json")]
+    pub options: JsonSerializerOptions,
+}
+
+/// Options for the JsonSerializer.
+#[crate::configurable_component]
+#[derive(Debug, Clone, Default)]
+pub struct JsonSerializerOptions {
+    /// Whether to use pretty JSON formatting.
+    #[serde(default)]
+    pub use_pretty_json: bool,
 }
 
 impl JsonSerializerConfig {
     /// Creates a new `JsonSerializerConfig`.
-    pub const fn new(metric_tag_values: MetricTagValues) -> Self {
-        Self { metric_tag_values }
+    pub const fn new(metric_tag_values: MetricTagValues, options: JsonSerializerOptions) -> Self {
+        Self {
+            metric_tag_values,
+            options,
+        }
     }
 
     /// Build the `JsonSerializer` from this configuration.
-    pub const fn build(&self) -> JsonSerializer {
-        JsonSerializer::new(self.metric_tag_values)
+    pub fn build(&self) -> JsonSerializer {
+        JsonSerializer::new(self.metric_tag_values, self.options.clone())
     }
 
     /// The data type of events that are accepted by `JsonSerializer`.
@@ -44,12 +60,16 @@ impl JsonSerializerConfig {
 #[derive(Debug, Clone)]
 pub struct JsonSerializer {
     metric_tag_values: MetricTagValues,
+    options: JsonSerializerOptions,
 }
 
 impl JsonSerializer {
     /// Creates a new `JsonSerializer`.
-    pub const fn new(metric_tag_values: MetricTagValues) -> Self {
-        Self { metric_tag_values }
+    pub const fn new(metric_tag_values: MetricTagValues, options: JsonSerializerOptions) -> Self {
+        Self {
+            metric_tag_values,
+            options,
+        }
     }
 
     /// Encode event and represent it as JSON value.
@@ -68,15 +88,28 @@ impl Encoder<Event> for JsonSerializer {
 
     fn encode(&mut self, event: Event, buffer: &mut BytesMut) -> Result<(), Self::Error> {
         let writer = buffer.writer();
-        match event {
-            Event::Log(log) => serde_json::to_writer(writer, &log),
-            Event::Metric(mut metric) => {
-                if self.metric_tag_values == MetricTagValues::Single {
-                    metric.reduce_tags_to_single();
+        if self.options.use_pretty_json {
+            match event {
+                Event::Log(log) => serde_json::to_writer_pretty(writer, &log),
+                Event::Metric(mut metric) => {
+                    if self.metric_tag_values == MetricTagValues::Single {
+                        metric.reduce_tags_to_single();
+                    }
+                    serde_json::to_writer_pretty(writer, &metric)
                 }
-                serde_json::to_writer(writer, &metric)
+                Event::Trace(trace) => serde_json::to_writer_pretty(writer, &trace),
+            }
+        } else {
+            match event {
+                Event::Log(log) => serde_json::to_writer(writer, &log),
+                Event::Metric(mut metric) => {
+                    if self.metric_tag_values == MetricTagValues::Single {
+                        metric.reduce_tags_to_single();
+                    }
+                    serde_json::to_writer(writer, &metric)
+                }
+                Event::Trace(trace) => serde_json::to_writer(writer, &trace),
             }
-            Event::Trace(trace) => serde_json::to_writer(writer, &trace),
         }
         .map_err(Into::into)
     }
@@ -191,6 +224,7 @@ mod tests {
         let bytes = serialize(
             JsonSerializerConfig {
                 metric_tag_values: MetricTagValues::Full,
+                options: JsonSerializerOptions::default(),
             },
             metric2(),
         );
@@ -206,6 +240,7 @@ mod tests {
         let bytes = serialize(
             JsonSerializerConfig {
                 metric_tag_values: MetricTagValues::Single,
+                options: JsonSerializerOptions::default(),
             },
             metric2(),
         );
@@ -236,4 +271,208 @@ mod tests {
         config.build().encode(input, &mut buffer).unwrap();
         buffer.freeze()
     }
+
+    mod pretty_json {
+
+        use super::*;
+        use bytes::{Bytes, BytesMut};
+        use chrono::{TimeZone, Timelike, Utc};
+        use vector_core::event::{LogEvent, Metric, MetricKind, MetricValue, StatisticKind, Value};
+        use vector_core::metric_tags;
+        use vrl::btreemap;
+
+        fn get_pretty_json_config() -> JsonSerializerConfig {
+            JsonSerializerConfig {
+                options: JsonSerializerOptions {
+                    use_pretty_json: true,
+                },
+                ..Default::default()
+            }
+        }
+
+        #[test]
+        fn serialize_json_log() {
+            let event = Event::Log(LogEvent::from(
+                btreemap! {"x" => Value::from("23"),"z" => Value::from(25),"a" => Value::from("0"),},
+            ));
+            let bytes = serialize(get_pretty_json_config(), event);
+            assert_eq!(
+                bytes,
+                r#"{
+  "a": "0",
+  "x": "23",
+  "z": 25
+}"#
+            );
+        }
+        #[test]
+        fn serialize_json_metric_counter() {
+            let event = Event::Metric(
+                Metric::new(
+                    "foos",
+                    MetricKind::Incremental,
+                    MetricValue::Counter { value: 100.0 },
+                )
+                .with_namespace(Some("vector"))
+                .with_tags(Some(
+                    metric_tags!("key2" => "value2","key1" => "value1","Key3" => "Value3",),
+                ))
+                .with_timestamp(Some(
+                    Utc.with_ymd_and_hms(2018, 11, 14, 8, 9, 10)
+                        .single()
+                        .and_then(|t| t.with_nanosecond(11))
+                        .expect("invalid timestamp"),
+                )),
+            );
+            let bytes = serialize(get_pretty_json_config(), event);
+            assert_eq!(
+                bytes,
+                r#"{
+  "name": "foos",
+  "namespace": "vector",
+  "tags": {
+    "Key3": "Value3",
+    "key1": "value1",
+    "key2": "value2"
+  },
+  "timestamp": "2018-11-14T08:09:10.000000011Z",
+  "kind": "incremental",
+  "counter": {
+    "value": 100.0
+  }
+}"#
+            );
+        }
+        #[test]
+        fn serialize_json_metric_set() {
+            let event = Event::Metric(Metric::new(
+                "users",
+                MetricKind::Incremental,
+                MetricValue::Set {
+                    values: vec!["bob".into()].into_iter().collect(),
+                },
+            ));
+            let bytes = serialize(get_pretty_json_config(), event);
+            assert_eq!(
+                bytes,
+                r#"{
+  "name": "users",
+  "kind": "incremental",
+  "set": {
+    "values": [
+      "bob"
+    ]
+  }
+}"#
+            );
+        }
+        #[test]
+        fn serialize_json_metric_histogram_without_timestamp() {
+            let event = Event::Metric(Metric::new(
+                "glork",
+                MetricKind::Incremental,
+                MetricValue::Distribution {
+                    samples: vector_core::samples![10.0 => 1],
+                    statistic: StatisticKind::Histogram,
+                },
+            ));
+            let bytes = serialize(get_pretty_json_config(), event);
+            assert_eq!(
+                bytes,
+                r#"{
+  "name": "glork",
+  "kind": "incremental",
+  "distribution": {
+    "samples": [
+      {
+        "value": 10.0,
+        "rate": 1
+      }
+    ],
+    "statistic": "histogram"
+  }
+}"#
+            );
+        }
+        #[test]
+        fn serialize_equals_to_json_value() {
+            let event = Event::Log(LogEvent::from(btreemap! {"foo" => Value::from("bar")}));
+            let mut serializer = get_pretty_json_config().build();
+            let mut bytes = BytesMut::new();
+            serializer.encode(event.clone(), &mut bytes).unwrap();
+            let json = serializer.to_json_value(event).unwrap();
+            assert_eq!(bytes.freeze(), serde_json::to_string_pretty(&json).unwrap());
+        }
+        #[test]
+        fn serialize_metric_tags_full() {
+            let bytes = serialize(
+                JsonSerializerConfig {
+                    metric_tag_values: MetricTagValues::Full,
+                    options: JsonSerializerOptions {
+                        use_pretty_json: true,
+                    },
+                },
+                metric2(),
+            );
+            assert_eq!(
+                bytes,
+                r#"{
+  "name": "counter",
+  "tags": {
+    "a": [
+      "first",
+      null,
+      "second"
+    ]
+  },
+  "kind": "incremental",
+  "counter": {
+    "value": 1.0
+  }
+}"#
+            );
+        }
+        #[test]
+        fn serialize_metric_tags_single() {
+            let bytes = serialize(
+                JsonSerializerConfig {
+                    metric_tag_values: MetricTagValues::Single,
+                    options: JsonSerializerOptions {
+                        use_pretty_json: true,
+                    },
+                },
+                metric2(),
+            );
+            assert_eq!(
+                bytes,
+                r#"{
+  "name": "counter",
+  "tags": {
+    "a": "second"
+  },
+  "kind": "incremental",
+  "counter": {
+    "value": 1.0
+  }
+}"#
+            );
+        }
+        fn metric2() -> Event {
+            Event::Metric(
+                Metric::new(
+                    "counter",
+                    MetricKind::Incremental,
+                    MetricValue::Counter { value: 1.0 },
+                )
+                .with_tags(Some(
+                    metric_tags! ("a" => "first","a" => None,"a" => "second",),
+                )),
+            )
+        }
+        fn serialize(config: JsonSerializerConfig, input: Event) -> Bytes {
+            let mut buffer = BytesMut::new();
+            config.build().encode(input, &mut buffer).unwrap();
+            buffer.freeze()
+        }
+    }
 }

lib/codecs/src/encoding/format/mod.rs

@@ -21,7 +21,7 @@ pub use self::csv::{CsvSerializer, CsvSerializerConfig};
 pub use avro::{AvroSerializer, AvroSerializerConfig, AvroSerializerOptions};
 use dyn_clone::DynClone;
 pub use gelf::{GelfSerializer, GelfSerializerConfig};
-pub use json::{JsonSerializer, JsonSerializerConfig};
+pub use json::{JsonSerializer, JsonSerializerConfig, JsonSerializerOptions};
 pub use logfmt::{LogfmtSerializer, LogfmtSerializerConfig};
 pub use native::{NativeSerializer, NativeSerializerConfig};
 pub use native_json::{NativeJsonSerializer, NativeJsonSerializerConfig};

lib/k8s-e2e-tests/tests/vector-agent.rs

@@ -993,6 +993,8 @@ async fn custom_selectors() -> Result<(), Box<dyn std::error::Error>> {
               inputs: [kubernetes_logs]
               encoding:
                 codec: json
+                json:
+                    use_pretty_json: false
     "#};
 
     let vector = framework
@@ -1395,6 +1397,8 @@ async fn glob_pattern_filtering() -> Result<(), Box<dyn std::error::Error>> {
               inputs: [kubernetes_logs]
               encoding:
                 codec: json
+                json:
+                    use_pretty_json: false
     "#};
 
     let vector = framework

src/components/validation/resources/event.rs

@@ -5,6 +5,7 @@ use serde::Deserialize;
 use serde_json::Value;
 use snafu::Snafu;
 use tokio_util::codec::Encoder as _;
+use vector_lib::codecs::encoding::format::JsonSerializerOptions;
 
 use crate::codecs::Encoder;
 use vector_lib::codecs::{
@@ -179,7 +180,11 @@ pub fn encode_test_event(
             } else {
                 Encoder::<encoding::Framer>::new(
                     NewlineDelimitedEncoder::new().into(),
-                    JsonSerializer::new(MetricTagValues::default()).into(),
+                    JsonSerializer::new(
+                        MetricTagValues::default(),
+                        JsonSerializerOptions::default(),
+                    )
+                    .into(),
                 )
             };