refactor: Event per log, streamline data handling (#1209)

---------

Signed-off-by: Devdutt Shenoi <[email protected]>

Author: de-sh

src/connectors/kafka/processor.rs

@@ -16,10 +16,9 @@
  *
  */
 
-use std::{collections::HashMap, sync::Arc};
+use std::sync::Arc;
 
 use async_trait::async_trait;
-use chrono::Utc;
 use futures_util::StreamExt;
 use rdkafka::consumer::{CommitMode, Consumer};
 use serde_json::Value;
@@ -58,38 +57,10 @@ impl ParseableSinkProcessor {
         let stream = PARSEABLE.get_stream(stream_name)?;
         let schema = stream.get_schema_raw();
         let time_partition = stream.get_time_partition();
+        let custom_partition = stream.get_custom_partition();
         let static_schema_flag = stream.get_static_schema_flag();
         let schema_version = stream.get_schema_version();
 
-        let (json_vec, total_payload_size) = Self::json_vec(records);
-        let batch_json_event = json::Event {
-            data: Value::Array(json_vec),
-        };
-
-        let (rb, is_first) = batch_json_event.into_recordbatch(
-            &schema,
-            Utc::now(),
-            static_schema_flag,
-            time_partition.as_ref(),
-            schema_version,
-        )?;
-
-        let p_event = ParseableEvent {
-            rb,
-            stream_name: stream_name.to_string(),
-            origin_format: "json",
-            origin_size: total_payload_size,
-            is_first_event: is_first,
-            parsed_timestamp: Utc::now().naive_utc(),
-            time_partition: None,
-            custom_partition_values: HashMap::new(),
-            stream_type: StreamType::UserDefined,
-        };
-
-        Ok(p_event)
-    }
-
-    fn json_vec(records: &[ConsumerRecord]) -> (Vec<Value>, u64) {
         let mut json_vec = Vec::with_capacity(records.len());
         let mut total_payload_size = 0u64;
 
@@ -100,19 +71,30 @@ impl ParseableSinkProcessor {
             }
         }
 
-        (json_vec, total_payload_size)
+        let p_event = json::Event::new(Value::Array(json_vec)).into_event(
+            stream_name.to_string(),
+            total_payload_size,
+            &schema,
+            static_schema_flag,
+            custom_partition.as_ref(),
+            time_partition.as_ref(),
+            schema_version,
+            StreamType::UserDefined,
+        )?;
+
+        Ok(p_event)
     }
 }
 
 #[async_trait]
 impl Processor<Vec<ConsumerRecord>, ()> for ParseableSinkProcessor {
     async fn process(&self, records: Vec<ConsumerRecord>) -> anyhow::Result<()> {
         let len = records.len();
-        debug!("Processing {} records", len);
+        debug!("Processing {len} records");
 
         self.build_event_from_chunk(&records).await?.process()?;
 
-        debug!("Processed {} records", len);
+        debug!("Processed {len} records");
         Ok(())
     }
 }

src/event/format/json.rs

@@ -23,22 +23,38 @@ use anyhow::anyhow;
 use arrow_array::RecordBatch;
 use arrow_json::reader::{infer_json_schema_from_iterator, ReaderBuilder};
 use arrow_schema::{DataType, Field, Fields, Schema};
+use chrono::{DateTime, NaiveDateTime, Utc};
 use datafusion::arrow::util::bit_util::round_upto_multiple_of_64;
 use itertools::Itertools;
 use serde_json::Value;
 use std::{collections::HashMap, sync::Arc};
 use tracing::error;
 
 use super::EventFormat;
-use crate::{metadata::SchemaVersion, utils::arrow::get_field};
+use crate::{metadata::SchemaVersion, storage::StreamType, utils::arrow::get_field};
 
 pub struct Event {
-    pub data: Value,
+    pub json: Value,
+    pub p_timestamp: DateTime<Utc>,
+}
+
+impl Event {
+    pub fn new(json: Value) -> Self {
+        Self {
+            json,
+            p_timestamp: Utc::now(),
+        }
+    }
 }
 
 impl EventFormat for Event {
     type Data = Vec<Value>;
 
+    /// Returns the time at ingestion, i.e. the `p_timestamp` value
+    fn get_p_timestamp(&self) -> DateTime<Utc> {
+        self.p_timestamp
+    }
+
     // convert the incoming json to a vector of json values
     // also extract the arrow schema, tags and metadata from the incoming json
     fn to_data(
@@ -52,7 +68,7 @@ impl EventFormat for Event {
         // incoming event may be a single json or a json array
         // but Data (type defined above) is a vector of json values
         // hence we need to convert the incoming event to a vector of json values
-        let value_arr = match self.data {
+        let value_arr = match self.json {
             Value::Array(arr) => arr,
             value @ Value::Object(_) => vec![value],
             _ => unreachable!("flatten would have failed beforehand"),
@@ -120,6 +136,87 @@ impl EventFormat for Event {
             Ok(None) => unreachable!("all records are added to one rb"),
         }
     }
+
+    /// Converts a JSON event into a Parseable Event
+    fn into_event(
+        self,
+        stream_name: String,
+        origin_size: u64,
+        storage_schema: &HashMap<String, Arc<Field>>,
+        static_schema_flag: bool,
+        custom_partitions: Option<&String>,
+        time_partition: Option<&String>,
+        schema_version: SchemaVersion,
+        stream_type: StreamType,
+    ) -> Result<super::Event, anyhow::Error> {
+        let custom_partition_values = match custom_partitions.as_ref() {
+            Some(custom_partition) => {
+                let custom_partitions = custom_partition.split(',').collect_vec();
+                extract_custom_partition_values(&self.json, &custom_partitions)
+            }
+            None => HashMap::new(),
+        };
+
+        let parsed_timestamp = match time_partition {
+            Some(time_partition) => extract_and_parse_time(&self.json, time_partition)?,
+            _ => self.p_timestamp.naive_utc(),
+        };
+
+        let (rb, is_first_event) = self.into_recordbatch(
+            storage_schema,
+            static_schema_flag,
+            time_partition,
+            schema_version,
+        )?;
+
+        Ok(super::Event {
+            rb,
+            stream_name,
+            origin_format: "json",
+            origin_size,
+            is_first_event,
+            parsed_timestamp,
+            time_partition: None,
+            custom_partition_values,
+            stream_type,
+        })
+    }
+}
+
+/// Extracts custom partition values from provided JSON object
+/// e.g. `json: {"status": 400, "msg": "Hello, World!"}, custom_partition_list: ["status"]` returns `{"status" => 400}`
+pub fn extract_custom_partition_values(
+    json: &Value,
+    custom_partition_list: &[&str],
+) -> HashMap<String, String> {
+    let mut custom_partition_values: HashMap<String, String> = HashMap::new();
+    for custom_partition_field in custom_partition_list {
+        let custom_partition_value = json.get(custom_partition_field.trim()).unwrap().to_owned();
+        let custom_partition_value = match custom_partition_value {
+            e @ Value::Number(_) | e @ Value::Bool(_) => e.to_string(),
+            Value::String(s) => s,
+            _ => "".to_string(),
+        };
+        custom_partition_values.insert(
+            custom_partition_field.trim().to_string(),
+            custom_partition_value,
+        );
+    }
+    custom_partition_values
+}
+
+/// Returns the parsed timestamp of deignated time partition from json object
+/// e.g. `json: {"timestamp": "2025-05-15T15:30:00Z"}` returns `2025-05-15T15:30:00`
+fn extract_and_parse_time(
+    json: &Value,
+    time_partition: &str,
+) -> Result<NaiveDateTime, anyhow::Error> {
+    let current_time = json
+        .get(time_partition)
+        .ok_or_else(|| anyhow!("Missing field for time partition in json: {time_partition}"))?;
+    let parsed_time: DateTime<Utc> = serde_json::from_value(current_time.clone())?;
+
+    Ok(parsed_time.naive_utc())
 }
 
 // Returns arrow schema with the fields that are present in the request body
@@ -225,3 +322,37 @@ fn valid_type(data_type: &DataType, value: &Value, schema_version: SchemaVersion
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use std::str::FromStr;
+
+    use serde_json::json;
+
+    use super::*;
+
+    #[test]
+    fn parse_time_parition_from_value() {
+        let json = json!({"timestamp": "2025-05-15T15:30:00Z"});
+        let parsed = extract_and_parse_time(&json, "timestamp");
+
+        let expected = NaiveDateTime::from_str("2025-05-15T15:30:00").unwrap();
+        assert_eq!(parsed.unwrap(), expected);
+    }
+
+    #[test]
+    fn time_parition_not_in_json() {
+        let json = json!({"hello": "world!"});
+        let parsed = extract_and_parse_time(&json, "timestamp");
+
+        assert!(parsed.is_err());
+    }
+
+    #[test]
+    fn time_parition_not_parseable_as_datetime() {
+        let json = json!({"timestamp": "not time"});
+        let parsed = extract_and_parse_time(&json, "timestamp");
+
+        assert!(parsed.is_err());
+    }
+}

src/event/format/mod.rs

@@ -32,10 +32,11 @@ use serde_json::Value;
 
 use crate::{
     metadata::SchemaVersion,
+    storage::StreamType,
     utils::arrow::{get_field, get_timestamp_array, replace_columns},
 };
 
-use super::DEFAULT_TIMESTAMP_KEY;
+use super::{Event, DEFAULT_TIMESTAMP_KEY};
 
 pub mod json;
 
@@ -105,14 +106,17 @@ pub trait EventFormat: Sized {
 
     fn decode(data: Self::Data, schema: Arc<Schema>) -> Result<RecordBatch, AnyError>;
 
+    /// Returns the UTC time at ingestion
+    fn get_p_timestamp(&self) -> DateTime<Utc>;
+
     fn into_recordbatch(
         self,
         storage_schema: &HashMap<String, Arc<Field>>,
-        p_timestamp: DateTime<Utc>,
         static_schema_flag: bool,
         time_partition: Option<&String>,
         schema_version: SchemaVersion,
     ) -> Result<(RecordBatch, bool), AnyError> {
+        let p_timestamp = self.get_p_timestamp();
         let (data, mut schema, is_first) =
             self.to_data(storage_schema, time_partition, schema_version)?;
 
@@ -173,6 +177,19 @@ pub trait EventFormat: Sized {
         }
         true
     }
+
+    #[allow(clippy::too_many_arguments)]
+    fn into_event(
+        self,
+        stream_name: String,
+        origin_size: u64,
+        storage_schema: &HashMap<String, Arc<Field>>,
+        static_schema_flag: bool,
+        custom_partitions: Option<&String>,
+        time_partition: Option<&String>,
+        schema_version: SchemaVersion,
+        stream_type: StreamType,
+    ) -> Result<Event, AnyError>;
 }
 
 pub fn get_existing_field_names(

src/event/mod.rs

@@ -81,7 +81,7 @@ impl Event {
             self.origin_format,
             self.origin_size,
             self.rb.num_rows(),
-            self.parsed_timestamp,
+            self.parsed_timestamp.date(),
         );
 
         crate::livetail::LIVETAIL.process(&self.stream_name, &self.rb);