spiresql 0.1.2

SQL interface for SpireDB
Documentation 
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//! Change Data Capture (CDC) for SpireDB
#![allow(dead_code)]

use super::consumer::Consumer;
use super::error::StreamError;
use super::types::{ChangeEvent, Op};

/// Builder for CDC subscriptions
pub struct CdcBuilder<'a> {
    consumer: Option<&'a Consumer>,
    bootstrap_servers: Option<String>,
    tables: Vec<String>,
    operations: Vec<Op>,
    from_beginning: bool,
}

impl<'a> CdcBuilder<'a> {
    /// Create a new CDC builder with bootstrap servers
    pub fn new(servers: impl Into<String>) -> Self {
        Self {
            consumer: None,
            bootstrap_servers: Some(servers.into()),
            tables: Vec::new(),
            operations: vec![Op::Insert, Op::Update, Op::Delete],
            from_beginning: false,
        }
    }

    /// Create a CDC builder from an existing consumer
    pub fn from_consumer(consumer: &'a Consumer) -> Self {
        Self {
            consumer: Some(consumer),
            bootstrap_servers: None,
            tables: Vec::new(),
            operations: vec![Op::Insert, Op::Update, Op::Delete],
            from_beginning: false,
        }
    }

    /// Set tables to capture changes from
    pub fn tables(mut self, tables: &[&str]) -> Self {
        self.tables = tables.iter().map(|s| s.to_string()).collect();
        self
    }

    /// Set operations to capture
    pub fn operations(mut self, ops: &[Op]) -> Self {
        self.operations = ops.to_vec();
        self
    }

    /// Start from beginning (all historical changes)
    pub fn beginning(mut self) -> Self {
        self.from_beginning = true;
        self
    }

    /// Start from now (only new changes)
    pub fn current(mut self) -> Self {
        self.from_beginning = false;
        self
    }

    /// Build and subscribe to CDC stream
    pub async fn build(self) -> Result<CdcStream, StreamError> {
        if self.tables.is_empty() {
            return Err(StreamError::Config(
                "at least one table is required".to_string(),
            ));
        }

        Ok(CdcStream {
            tables: self.tables,
            operations: self.operations,
            _from_beginning: self.from_beginning,
        })
    }

    /// Alias for build
    pub async fn subscribe(self) -> Result<CdcStream, StreamError> {
        self.build().await
    }
}

/// CDC stream for receiving change events
pub struct CdcStream {
    tables: Vec<String>,
    operations: Vec<Op>,
    _from_beginning: bool,
}

impl CdcStream {
    /// Poll for the next change event
    pub async fn poll(&self) -> Result<Option<ChangeEvent>, StreamError> {
        // In a real implementation, this would:
        // 1. Read from the change_log column family
        // 2. Filter by tables and operations
        // 3. Return the next matching change
        Ok(None)
    }

    /// Poll with timeout
    pub async fn poll_timeout(
        &self,
        _timeout: std::time::Duration,
    ) -> Result<Option<ChangeEvent>, StreamError> {
        self.poll().await
    }

    /// Get subscribed tables
    pub fn tables(&self) -> &[String] {
        &self.tables
    }

    /// Get subscribed operations
    pub fn operations(&self) -> &[Op] {
        &self.operations
    }

    /// Close the CDC stream
    pub async fn close(&self) -> Result<(), StreamError> {
        Ok(())
    }
}