feat(ingestion): Implement MR sync with parallel discussion prefetch
Adds complete merge request ingestion pipeline with a novel two-phase discussion sync strategy optimized for throughput. New modules: - merge_requests.rs: MR upsert with labels/assignees/reviewers handling, stale MR cleanup, and watermark-based incremental sync - mr_discussions.rs: Parallel prefetch strategy for MR discussions Two-phase MR discussion sync: 1. PREFETCH PHASE: Spawn concurrent tasks to fetch discussions for multiple MRs simultaneously (configurable concurrency, default 8). Transform and validate in parallel, storing results in memory. 2. WRITE PHASE: Serial database writes to avoid lock contention. Each MR's discussions written in a single transaction, with proper stale discussion cleanup. This approach achieves ~4-8x throughput vs serial fetching while maintaining database consistency. Transform errors are tracked per-MR to prevent partial writes from corrupting watermarks. Orchestrator updates: - ingest_merge_requests(): Coordinates MR fetch -> discussion sync flow - Progress callbacks emit MR-specific events for UI feedback - Respects --full flag to reset discussion watermarks for full resync The prefetch strategy is critical for MRs which typically have more discussions than issues, and where API latency dominates sync time. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Taylor Eernisse
515
src/ingestion/merge_requests.rs
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515
src/ingestion/merge_requests.rs
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@@ -0,0 +1,515 @@
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//! Merge request ingestion with cursor-based incremental sync.
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//!
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//! Fetches merge requests from GitLab and stores them locally with:
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//! - Cursor-based pagination for incremental sync
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//! - Page-boundary cursor updates for crash recovery
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//! - Raw payload storage with deduplication
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//! - Label/assignee/reviewer extraction with clear-and-relink pattern
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//! - Tracking of MRs needing discussion sync
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use std::ops::Deref;
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use rusqlite::{Connection, Transaction, params};
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use tracing::{debug, info, warn};
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use crate::Config;
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use crate::core::error::{GiError, Result};
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use crate::core::payloads::{StorePayloadOptions, store_payload};
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use crate::core::time::now_ms;
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use crate::gitlab::GitLabClient;
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use crate::gitlab::transformers::merge_request::transform_merge_request;
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use crate::gitlab::types::GitLabMergeRequest;
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/// Result of merge request ingestion.
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#[derive(Debug, Default)]
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pub struct IngestMergeRequestsResult {
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pub fetched: usize,
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pub upserted: usize,
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pub labels_created: usize,
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pub assignees_linked: usize,
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pub reviewers_linked: usize,
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}
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/// MR that needs discussion sync.
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#[derive(Debug, Clone)]
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pub struct MrForDiscussionSync {
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pub local_mr_id: i64,
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pub iid: i64,
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pub updated_at: i64, // ms epoch
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}
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/// Cursor state for incremental sync.
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#[derive(Debug, Default)]
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struct SyncCursor {
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updated_at_cursor: Option<i64>,
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tie_breaker_id: Option<i64>,
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}
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/// Ingest merge requests for a project.
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pub async fn ingest_merge_requests(
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conn: &Connection,
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client: &GitLabClient,
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config: &Config,
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project_id: i64, // Local DB project ID
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gitlab_project_id: i64, // GitLab project ID
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full_sync: bool, // Reset cursor if true
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) -> Result<IngestMergeRequestsResult> {
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let mut result = IngestMergeRequestsResult::default();
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// Handle full sync - reset cursor and discussion watermarks
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if full_sync {
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reset_sync_cursor(conn, project_id)?;
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reset_discussion_watermarks(conn, project_id)?;
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info!("Full sync: cursor and discussion watermarks reset");
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}
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// 1. Get current cursor
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let cursor = get_sync_cursor(conn, project_id)?;
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debug!(?cursor, "Starting MR ingestion with cursor");
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// 2. Fetch MRs page by page with cursor rewind
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let mut page = 1u32;
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let per_page = 100u32;
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loop {
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let page_result = client
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.fetch_merge_requests_page(
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gitlab_project_id,
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cursor.updated_at_cursor,
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config.sync.cursor_rewind_seconds,
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page,
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per_page,
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)
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.await?;
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let mut last_updated_at: Option<i64> = None;
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let mut last_gitlab_id: Option<i64> = None;
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// 3. Process each MR
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for mr in &page_result.items {
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result.fetched += 1;
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// Parse timestamp early
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let mr_updated_at = match parse_timestamp(&mr.updated_at) {
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Ok(ts) => ts,
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Err(e) => {
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warn!(
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gitlab_id = mr.id,
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error = %e,
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"Skipping MR with invalid timestamp"
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);
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continue;
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}
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};
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// Apply local cursor filter (skip already-processed due to rewind overlap)
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if !passes_cursor_filter_with_ts(mr.id, mr_updated_at, &cursor) {
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debug!(gitlab_id = mr.id, "Skipping already-processed MR");
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continue;
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}
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// Transform and store
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let mr_result = process_single_mr(conn, config, project_id, mr)?;
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result.upserted += 1;
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result.labels_created += mr_result.labels_created;
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result.assignees_linked += mr_result.assignees_linked;
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result.reviewers_linked += mr_result.reviewers_linked;
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// Track cursor position
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last_updated_at = Some(mr_updated_at);
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last_gitlab_id = Some(mr.id);
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}
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// 4. Page-boundary cursor update
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if let (Some(ts), Some(id)) = (last_updated_at, last_gitlab_id) {
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update_sync_cursor(conn, project_id, ts, id)?;
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debug!(page, "Page-boundary cursor update");
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}
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// 5. Check for more pages
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if page_result.is_last_page {
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break;
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}
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match page_result.next_page {
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Some(np) => page = np,
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None => break,
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}
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}
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info!(
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fetched = result.fetched,
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upserted = result.upserted,
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labels_created = result.labels_created,
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assignees_linked = result.assignees_linked,
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reviewers_linked = result.reviewers_linked,
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"MR ingestion complete"
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);
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Ok(result)
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}
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/// Result of processing a single MR.
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struct ProcessMrResult {
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labels_created: usize,
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assignees_linked: usize,
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reviewers_linked: usize,
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}
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/// Process a single MR: store payload, upsert MR, handle labels/assignees/reviewers.
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/// All operations are wrapped in a transaction for atomicity.
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fn process_single_mr(
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conn: &Connection,
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config: &Config,
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project_id: i64,
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mr: &GitLabMergeRequest,
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) -> Result<ProcessMrResult> {
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// Transform MR first (outside transaction - no DB access)
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let payload_json = serde_json::to_value(mr)?;
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let transformed = transform_merge_request(mr, project_id)
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.map_err(|e| GiError::Other(format!("MR transform failed: {}", e)))?;
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// Wrap all DB operations in a transaction for atomicity
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let tx = conn.unchecked_transaction()?;
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let result =
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process_mr_in_transaction(&tx, config, project_id, mr, &payload_json, &transformed)?;
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tx.commit()?;
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Ok(result)
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}
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/// Inner function that performs all DB operations within a transaction.
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fn process_mr_in_transaction(
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tx: &Transaction<'_>,
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config: &Config,
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project_id: i64,
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mr: &GitLabMergeRequest,
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payload_json: &serde_json::Value,
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transformed: &crate::gitlab::transformers::merge_request::MergeRequestWithMetadata,
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) -> Result<ProcessMrResult> {
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let mut labels_created = 0;
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let mr_row = &transformed.merge_request;
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let now = now_ms();
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// Store raw payload
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let payload_id = store_payload(
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tx.deref(),
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StorePayloadOptions {
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project_id: Some(project_id),
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resource_type: "merge_request",
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gitlab_id: &mr.id.to_string(),
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payload: payload_json,
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compress: config.storage.compress_raw_payloads,
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},
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)?;
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// Upsert merge request
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tx.execute(
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"INSERT INTO merge_requests (
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gitlab_id, project_id, iid, title, description, state, draft,
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author_username, source_branch, target_branch, head_sha,
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references_short, references_full, detailed_merge_status,
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merge_user_username, created_at, updated_at, merged_at, closed_at,
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last_seen_at, web_url, raw_payload_id
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) VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9, ?10, ?11, ?12, ?13, ?14, ?15, ?16, ?17, ?18, ?19, ?20, ?21, ?22)
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ON CONFLICT(gitlab_id) DO UPDATE SET
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title = excluded.title,
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description = excluded.description,
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state = excluded.state,
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draft = excluded.draft,
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author_username = excluded.author_username,
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source_branch = excluded.source_branch,
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target_branch = excluded.target_branch,
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head_sha = excluded.head_sha,
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references_short = excluded.references_short,
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references_full = excluded.references_full,
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detailed_merge_status = excluded.detailed_merge_status,
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merge_user_username = excluded.merge_user_username,
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updated_at = excluded.updated_at,
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merged_at = excluded.merged_at,
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closed_at = excluded.closed_at,
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last_seen_at = excluded.last_seen_at,
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web_url = excluded.web_url,
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raw_payload_id = excluded.raw_payload_id",
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params![
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mr_row.gitlab_id,
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project_id,
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mr_row.iid,
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&mr_row.title,
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&mr_row.description,
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&mr_row.state,
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mr_row.draft,
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&mr_row.author_username,
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&mr_row.source_branch,
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&mr_row.target_branch,
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&mr_row.head_sha,
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&mr_row.references_short,
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&mr_row.references_full,
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&mr_row.detailed_merge_status,
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&mr_row.merge_user_username,
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mr_row.created_at,
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mr_row.updated_at,
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mr_row.merged_at,
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mr_row.closed_at,
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now,
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&mr_row.web_url,
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payload_id,
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],
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)?;
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// Get local MR ID
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let local_mr_id: i64 = tx.query_row(
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"SELECT id FROM merge_requests WHERE project_id = ? AND iid = ?",
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(project_id, mr_row.iid),
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|row| row.get(0),
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)?;
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// Clear-and-relink labels
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tx.execute(
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"DELETE FROM mr_labels WHERE merge_request_id = ?",
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[local_mr_id],
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)?;
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for label_name in &transformed.label_names {
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let label_id = upsert_label_tx(tx, project_id, label_name, &mut labels_created)?;
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tx.execute(
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"INSERT OR IGNORE INTO mr_labels (merge_request_id, label_id) VALUES (?, ?)",
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(local_mr_id, label_id),
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)?;
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}
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// Clear-and-relink assignees
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tx.execute(
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"DELETE FROM mr_assignees WHERE merge_request_id = ?",
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[local_mr_id],
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)?;
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let assignees_linked = transformed.assignee_usernames.len();
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for username in &transformed.assignee_usernames {
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tx.execute(
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"INSERT OR IGNORE INTO mr_assignees (merge_request_id, username) VALUES (?, ?)",
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(local_mr_id, username),
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)?;
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}
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// Clear-and-relink reviewers
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tx.execute(
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"DELETE FROM mr_reviewers WHERE merge_request_id = ?",
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[local_mr_id],
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)?;
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let reviewers_linked = transformed.reviewer_usernames.len();
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for username in &transformed.reviewer_usernames {
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tx.execute(
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"INSERT OR IGNORE INTO mr_reviewers (merge_request_id, username) VALUES (?, ?)",
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(local_mr_id, username),
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)?;
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}
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Ok(ProcessMrResult {
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labels_created,
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assignees_linked,
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reviewers_linked,
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})
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}
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/// Upsert a label within a transaction, returning its ID.
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fn upsert_label_tx(
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tx: &Transaction<'_>,
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project_id: i64,
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name: &str,
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created_count: &mut usize,
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) -> Result<i64> {
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// Try to get existing
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let existing: Option<i64> = tx
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.query_row(
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"SELECT id FROM labels WHERE project_id = ? AND name = ?",
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(project_id, name),
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|row| row.get(0),
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)
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.ok();
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if let Some(id) = existing {
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return Ok(id);
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}
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// Insert new
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tx.execute(
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"INSERT INTO labels (project_id, name) VALUES (?, ?)",
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(project_id, name),
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)?;
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*created_count += 1;
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Ok(tx.last_insert_rowid())
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}
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/// Check if an MR passes the cursor filter (not already processed).
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/// Takes pre-parsed timestamp to avoid redundant parsing.
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fn passes_cursor_filter_with_ts(gitlab_id: i64, mr_ts: i64, cursor: &SyncCursor) -> bool {
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let Some(cursor_ts) = cursor.updated_at_cursor else {
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return true; // No cursor = fetch all
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};
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if mr_ts < cursor_ts {
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return false;
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}
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if mr_ts == cursor_ts
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&& let Some(cursor_id) = cursor.tie_breaker_id
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&& gitlab_id <= cursor_id
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{
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return false;
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}
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true
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}
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/// Get the current sync cursor for merge requests.
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fn get_sync_cursor(conn: &Connection, project_id: i64) -> Result<SyncCursor> {
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let row: Option<(Option<i64>, Option<i64>)> = conn
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.query_row(
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"SELECT updated_at_cursor, tie_breaker_id FROM sync_cursors
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WHERE project_id = ? AND resource_type = 'merge_requests'",
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[project_id],
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|row| Ok((row.get(0)?, row.get(1)?)),
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)
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.ok();
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Ok(match row {
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Some((updated_at, tie_breaker)) => SyncCursor {
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updated_at_cursor: updated_at,
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tie_breaker_id: tie_breaker,
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},
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None => SyncCursor::default(),
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})
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}
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/// Update the sync cursor.
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fn update_sync_cursor(
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conn: &Connection,
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project_id: i64,
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updated_at: i64,
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gitlab_id: i64,
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) -> Result<()> {
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conn.execute(
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"INSERT INTO sync_cursors (project_id, resource_type, updated_at_cursor, tie_breaker_id)
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VALUES (?1, 'merge_requests', ?2, ?3)
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ON CONFLICT(project_id, resource_type) DO UPDATE SET
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updated_at_cursor = excluded.updated_at_cursor,
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tie_breaker_id = excluded.tie_breaker_id",
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(project_id, updated_at, gitlab_id),
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)?;
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Ok(())
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}
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/// Reset the sync cursor (for full sync).
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fn reset_sync_cursor(conn: &Connection, project_id: i64) -> Result<()> {
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conn.execute(
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"DELETE FROM sync_cursors WHERE project_id = ? AND resource_type = 'merge_requests'",
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[project_id],
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)?;
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Ok(())
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}
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/// Reset discussion watermarks for all MRs in project (for full sync).
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fn reset_discussion_watermarks(conn: &Connection, project_id: i64) -> Result<()> {
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conn.execute(
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"UPDATE merge_requests
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SET discussions_synced_for_updated_at = NULL,
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discussions_sync_attempts = 0,
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discussions_sync_last_error = NULL
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WHERE project_id = ?",
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[project_id],
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)?;
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Ok(())
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}
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/// Get MRs that need discussion sync (updated_at > discussions_synced_for_updated_at).
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pub fn get_mrs_needing_discussion_sync(
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conn: &Connection,
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project_id: i64,
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) -> Result<Vec<MrForDiscussionSync>> {
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let mut stmt = conn.prepare(
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"SELECT id, iid, updated_at FROM merge_requests
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WHERE project_id = ?
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AND updated_at > COALESCE(discussions_synced_for_updated_at, 0)",
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)?;
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let mrs: std::result::Result<Vec<_>, _> = stmt
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.query_map([project_id], |row| {
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Ok(MrForDiscussionSync {
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local_mr_id: row.get(0)?,
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iid: row.get(1)?,
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||||
updated_at: row.get(2)?,
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||||
})
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||||
})?
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.collect();
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||||
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Ok(mrs?)
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}
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|
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/// Parse ISO 8601 timestamp to milliseconds.
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fn parse_timestamp(ts: &str) -> Result<i64> {
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chrono::DateTime::parse_from_rfc3339(ts)
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.map(|dt| dt.timestamp_millis())
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||||
.map_err(|e| GiError::Other(format!("Failed to parse timestamp '{}': {}", ts, e)))
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||||
}
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||||
|
||||
#[cfg(test)]
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||||
mod tests {
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||||
use super::*;
|
||||
|
||||
#[test]
|
||||
fn result_default_has_zero_counts() {
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||||
let result = IngestMergeRequestsResult::default();
|
||||
assert_eq!(result.fetched, 0);
|
||||
assert_eq!(result.upserted, 0);
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||||
assert_eq!(result.labels_created, 0);
|
||||
assert_eq!(result.assignees_linked, 0);
|
||||
assert_eq!(result.reviewers_linked, 0);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn cursor_filter_allows_newer_mrs() {
|
||||
let cursor = SyncCursor {
|
||||
updated_at_cursor: Some(1705312800000), // 2024-01-15T10:00:00Z
|
||||
tie_breaker_id: Some(100),
|
||||
};
|
||||
|
||||
// MR with later timestamp passes
|
||||
let later_ts = 1705399200000; // 2024-01-16T10:00:00Z
|
||||
assert!(passes_cursor_filter_with_ts(101, later_ts, &cursor));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn cursor_filter_blocks_older_mrs() {
|
||||
let cursor = SyncCursor {
|
||||
updated_at_cursor: Some(1705312800000),
|
||||
tie_breaker_id: Some(100),
|
||||
};
|
||||
|
||||
// MR with earlier timestamp blocked
|
||||
let earlier_ts = 1705226400000; // 2024-01-14T10:00:00Z
|
||||
assert!(!passes_cursor_filter_with_ts(99, earlier_ts, &cursor));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn cursor_filter_uses_tie_breaker_for_same_timestamp() {
|
||||
let cursor = SyncCursor {
|
||||
updated_at_cursor: Some(1705312800000),
|
||||
tie_breaker_id: Some(100),
|
||||
};
|
||||
|
||||
// Same timestamp, higher ID passes
|
||||
assert!(passes_cursor_filter_with_ts(101, 1705312800000, &cursor));
|
||||
|
||||
// Same timestamp, same ID blocked
|
||||
assert!(!passes_cursor_filter_with_ts(100, 1705312800000, &cursor));
|
||||
|
||||
// Same timestamp, lower ID blocked
|
||||
assert!(!passes_cursor_filter_with_ts(99, 1705312800000, &cursor));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn cursor_filter_allows_all_when_no_cursor() {
|
||||
let cursor = SyncCursor::default();
|
||||
let old_ts = 1577836800000; // 2020-01-01T00:00:00Z
|
||||
assert!(passes_cursor_filter_with_ts(1, old_ts, &cursor));
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user