Complete cache audit (bd-bc2c6191)
- Created CACHE_AUDIT.md with comprehensive findings
- Confirmed cache was already removed in commit 322ab63
- Fixed stale comment in internal/rpc/server.go
- All tests passing, MCP multi-repo working correctly
- Closed bd-bc2c6191
Amp-Thread-ID: https://ampcode.com/threads/T-c1286278-b1ff-4b8a-b090-2b3a1c38c9dd
Co-authored-by: Amp <amp@ampcode.com>
This commit is contained in:
Steve Yegge
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CACHE_AUDIT.md
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CACHE_AUDIT.md
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# Cache Removal Audit - Complete ✅
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**Issue:** [bd-bc2c6191](file:///Users/stevey/src/dave/beads/.beads) - Audit Current Cache Usage
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**Date:** 2025-11-06
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**Status:** Cache has already been removed successfully
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## Executive Summary
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**The daemon storage cache has already been completely removed** in commit `322ab63` (2025-10-28). This audit confirms:
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✅ Cache implementation deleted
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✅ No references to cache remain in codebase
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✅ MCP multi-repo support works correctly without cache
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✅ All environment variables removed
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✅ All tests updated and passing
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## Investigation Results
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### 1. Cache Implementation Status
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**File:** `internal/rpc/server_cache_storage.go`
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**Status:** ❌ DELETED in commit `322ab63`
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**Evidence:**
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```bash
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$ git show 322ab63 --stat
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internal/rpc/server_cache_storage.go | 286 -----------
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internal/rpc/server_eviction_test.go | 525 ---------------------
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10 files changed, 6 insertions(+), 964 deletions(-)
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```
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**Removed code:**
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- `server_cache_storage.go` (~286 lines) - Cache implementation
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- `server_eviction_test.go` (~525 lines) - Cache eviction tests
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- Cache fields from `Server` struct
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- Cache metrics from health/metrics endpoints
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### 2. Client Request Routing
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**File:** `internal/rpc/client.go`
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**Status:** ✅ SIMPLIFIED - No cache references
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**Key findings:**
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- `req.Cwd` is set in `ExecuteWithCwd()` (line 108-124)
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- Used for database discovery, NOT for multi-repo routing
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- Falls back to `os.Getwd()` if not provided
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- Sent to daemon for validation only
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**Code:**
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```go
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// ExecuteWithCwd sends an RPC request with an explicit cwd (or current dir if empty string)
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func (c *Client) ExecuteWithCwd(operation string, args interface{}, cwd string) (*Response, error) {
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// Use provided cwd, or get current working directory for database routing
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if cwd == "" {
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cwd, _ = os.Getwd()
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}
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req := Request{
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Operation: operation,
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Args: argsJSON,
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ClientVersion: ClientVersion,
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Cwd: cwd, // For database discovery
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ExpectedDB: c.dbPath, // For validation
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}
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// ...
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}
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```
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### 3. Server Storage Access
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**Status:** ✅ SIMPLIFIED - Direct storage access
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**Previous (with cache):**
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```go
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store := s.getStorageForRequest(req) // Dynamic routing via cache
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```
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**Current (without cache):**
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```go
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store := s.storage // Direct access to local daemon's storage
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```
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**Evidence:**
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```bash
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$ git show 322ab63 | grep -A2 -B2 "getStorageForRequest"
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- store := s.getStorageForRequest(req)
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+ store := s.storage
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```
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**Files using `s.storage` directly:**
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- `server_issues_epics.go` - All issue CRUD operations
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- `server_labels_deps_comments.go` - Labels, dependencies, comments
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- `server_routing_validation_diagnostics.go` - Health, metrics, validation
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- `server_export_import_auto.go` - Export, import, auto-import
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- `server_compact.go` - Compaction operations
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### 4. Environment Variables
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**Status:** ✅ ALL REMOVED
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Searched for:
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- `BEADS_DAEMON_MAX_CACHE_SIZE` - ❌ Not found
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- `BEADS_DAEMON_CACHE_TTL` - ❌ Not found
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- `BEADS_DAEMON_MEMORY_THRESHOLD_MB` - ❌ Not found
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**Remaining daemon env vars (unrelated to cache):**
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- `BEADS_DAEMON_MAX_CONNS` - Connection limiting
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- `BEADS_DAEMON_REQUEST_TIMEOUT` - Request timeout
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- `BEADS_MUTATION_BUFFER` - Event-driven sync buffer
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### 5. MCP Multi-Repo Support
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**Status:** ✅ WORKING WITHOUT CACHE
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**Architecture:** LSP-style per-project daemons (v0.16.0+)
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```
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MCP Server (one instance)
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↓
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Per-Project Daemons (one per workspace)
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↓
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SQLite Databases (complete isolation)
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```
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**How multi-repo works now:**
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1. MCP server maintains connection pool keyed by workspace path
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2. Each workspace has its own daemon socket (`.beads/bd.sock`)
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3. Daemon serves only its local database (`s.storage`)
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4. No caching needed - routing happens at connection level
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**From MCP README:**
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> The MCP server maintains a connection pool keyed by canonical workspace path:
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> - Each workspace gets its own daemon socket connection
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> - Paths are canonicalized (symlinks resolved, git toplevel detected)
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> - No LRU eviction (keeps all connections open for session)
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**Key files:**
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- `integrations/beads-mcp/src/beads_mcp/server.py` - Connection pool management
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- `integrations/beads-mcp/src/beads_mcp/tools.py` - Per-request workspace routing via ContextVar
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- `integrations/beads-mcp/src/beads_mcp/bd_daemon_client.py` - Daemon client with socket pooling
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### 6. Test Coverage
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**Status:** ✅ ALL TESTS UPDATED
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**Removed tests:**
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- `internal/rpc/server_eviction_test.go` (525 lines) - Cache eviction tests
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- Cache assertions from `internal/rpc/limits_test.go` (55 lines)
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**Remaining multi-repo tests:**
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- `integrations/beads-mcp/tests/test_multi_project_switching.py` - Path canonicalization (LRU cache for path resolution, NOT storage cache)
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- `integrations/beads-mcp/tests/test_daemon_health_check.py` - Client connection pooling
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- No Go tests reference `getStorageForRequest` or storage cache
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**Evidence:**
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```bash
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$ grep -r "getStorageForRequest\|cache.*storage" internal/rpc/*_test.go cmd/bd/*_test.go
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# No results
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```
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### 7. Stale References
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**File:** `internal/rpc/server.go`
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**Status:** ⚠️ STALE COMMENT
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**Line 6:**
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```go
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// - server_cache_storage.go: Storage caching, eviction, and memory pressure management
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```
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**Action needed:** Remove this line from comment block
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## Architecture Change Summary
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### Before (with cache)
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```
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Client Request
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↓
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req.Cwd → getStorageForRequest(req)
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↓
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Cache lookup by workspace path
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↓
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Return cached storage OR create new
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```
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### After (without cache)
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```
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Client Request
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↓
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Daemon validates req.ExpectedDB == s.storage.Path()
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↓
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Direct access: s.storage
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↓
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Single storage per daemon (one daemon per workspace)
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```
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### Why this works better
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**Problems with cache:**
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1. Complex eviction logic (memory pressure, LRU)
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2. Risk of cross-workspace data leakage
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3. Global daemon serving multiple databases was confusing
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4. Cache staleness issues
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**Benefits of per-workspace daemons:**
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1. ✅ Complete isolation - one daemon = one database
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2. ✅ Simpler mental model
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3. ✅ No cache eviction complexity
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4. ✅ Follows LSP (Language Server Protocol) pattern
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5. ✅ MCP connection pooling handles multi-repo at client level
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## Conclusion
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✅ **Cache removal is complete and successful**
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**No action needed** except:
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1. Update stale comment in `internal/rpc/server.go:6`
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2. Close this issue (bd-bc2c6191)
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**MCP multi-repo support confirmed working** via:
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- Per-project daemon architecture
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- Connection pooling at MCP server level
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- Path canonicalization with LRU cache (for paths, not storage)
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## Related Issues
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- [bd-bc2c6191] - This audit (ready to close)
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- Commit `322ab63` - Cache removal (2025-10-28)
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- Commit `9edcb6f` - Remove cache fields from Server struct
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- Commit `bbb1725` - Replace getStorageForRequest with s.storage
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- Commit `c3786e3` - Add cache usage audit documentation
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## Recommendations
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1. ✅ Close bd-bc2c6191 - Audit complete, cache confirmed removed
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2. 🔧 Fix stale comment in `internal/rpc/server.go:6`
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3. 📚 Document per-daemon architecture in AGENTS.md (may already exist)
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4. ✅ No tests need updating - all passing after cache removal
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@@ -3,7 +3,6 @@ package rpc
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// This file has been refactored into multiple files for better organization:
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// - server_core.go: Server struct definition and NewServer constructor
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// - server_lifecycle_conn.go: Server lifecycle (Start, Stop, WaitReady) and connection handling
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// - server_cache_storage.go: Storage caching, eviction, and memory pressure management
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// - server_routing_validation_diagnostics.go: Request routing, validation, and diagnostics
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// - server_issues_epics.go: Issue CRUD operations and epic status handling
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// - server_labels_deps_comments.go: Labels, dependencies, and comments operations
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