Struct ClickHouseEventsBackend 

pub struct ClickHouseEventsBackend(/* private fields */);

Remote ClickHouse structured-event storage.

connect opens the ClickHouse client and creates the Spectra events table when needed. Pair it with ClickHouseMetricsBackend because Spectra::builder() requires both storage paths.

Examples

Facade wiring through Spectra::builder() (requires the spectra crate with the clickhouse feature):

use std::sync::Arc;
use spectra::{ClickHouseEventsBackend, ClickHouseMetricsBackend, Spectra};

let url = "http://127.0.0.1:8123";
let spectra = Spectra::builder()
    .metrics_backend(Arc::new(ClickHouseMetricsBackend::connect(url).await?))
    .events_backend(Arc::new(ClickHouseEventsBackend::connect(url).await?))
    .build()?;

Implementations

impl ClickHouseEventsBackend

pub async fn connect(url: &str) -> Result<ClickHouseEventsBackend, Error>

Connect to ClickHouse over HTTP or native protocol and ensure event tables exist.

url is typically http://host:8123. The call is async and executes DDL, so the ClickHouse credentials need table-creation permission.

Examples

use spectra_backend_clickhouse::ClickHouseEventsBackend;

let backend = ClickHouseEventsBackend::connect("http://127.0.0.1:8123").await?;

pub fn in_memory_stub() -> ClickHouseEventsBackend

In-memory stub that preserves the ClickHouse engine type for storage-contract tests.

Examples

use spectra_backend_clickhouse::ClickHouseEventsBackend;
use spectra_core::{EventStorageBackend, StorageEngineType};

let backend = ClickHouseEventsBackend::in_memory_stub();
assert_eq!(backend.engine_type(), StorageEngineType::ClickHouse);

Trait Implementations

impl EventStorageBackend for ClickHouseEventsBackend

fn engine_type(&self) -> StorageEngineType

Returns the engine type for this backend.

fn append_row<'life0, 'life1, 'life2, 'life3, 'async_trait>( &'life0 self, table: &'life1 str, fields: &'life2 Value, ts: DateTime<Utc>, correlation_id: Option<&'life3 str>, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, 'life3: 'async_trait, ClickHouseEventsBackend: 'async_trait,

Appends one event row.

fn append_rows_batch<'life0, 'life1, 'async_trait>( &'life0 self, rows: &'life1 [EventWriteRow], ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, ClickHouseEventsBackend: 'async_trait,

Batch append event rows (default: per-row dispatch).

fn query_rows<'life0, 'async_trait>( &'life0 self, filter: EventsQueryFilter, ) -> Pin<Box<dyn Future<Output = Result<Vec<EventRow>, Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, ClickHouseEventsBackend: 'async_trait,

Queries event rows matching the filter.

fn query_aggregate<'life0, 'async_trait>( &'life0 self, filter: EventsAggregateFilter, ) -> Pin<Box<dyn Future<Output = Result<EventAggregateResult, Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, ClickHouseEventsBackend: 'async_trait,

Queries aggregated chart data.