adapters/sqlite: Add adapter

adapters/sqlite/README.md

@@ -0,0 +1,159 @@
+# SQLite Adapter
+
+A pure Go SQLite implementation for the workflow library's `RecordStore`, `TimeoutStore`, and `EventStreamer` interfaces.
+
+## Features
+
+- **Pure Go**: Uses `modernc.org/sqlite` (no CGO dependencies)
+- **Complete Implementation**: All three core interfaces supported
+- **Minimal Dependencies**: Only SQLite driver and workflow library
+- **Optimized Configuration**: WAL mode, proper pragmas, and retry logic
+- **Thread-Safe**: Safe for concurrent use within SQLite's limitations
+
+## Interfaces Implemented
+
+- ✅ **RecordStore**: Store and retrieve workflow records with transactional outbox pattern
+- ✅ **TimeoutStore**: Manage workflow timeouts with expiration tracking
+- ✅ **EventStreamer**: Event streaming with SQLite-based persistence and cursor tracking
+
+## Installation
+
+```go
+go get github.com/luno/workflow/adapters/sqlite
+```
+
+## Quick Start
+
+```go
+package main
+
+import (
+    "context"
+    "log"
+
+    "github.com/luno/workflow/adapters/sqlite"
+)
+
+func main() {
+    // Open database with optimized settings
+    db, err := sqlite.Open("workflow.db")
+    if err != nil {
+        log.Fatal(err)
+    }
+    defer db.Close()
+
+    // Initialize schema
+    if err := sqlite.InitSchema(db); err != nil {
+        log.Fatal(err)
+    }
+
+    // Create adapters
+    recordStore := sqlite.NewRecordStore(db)
+    timeoutStore := sqlite.NewTimeoutStore(db)
+    eventStreamer := sqlite.NewEventStreamer(db)
+
+    // Use with workflow builder
+    // builder := workflow.NewBuilder[MyType](...)
+    //     .AddRecordStore(recordStore)
+    //     .AddTimeoutStore(timeoutStore)
+    //     .AddEventStreamer(eventStreamer)
+}
+```
+
+## Configuration
+
+The `sqlite.Open()` function automatically configures SQLite for optimal workflow usage:
+
+- **WAL Mode**: Write-Ahead Logging for better concurrency
+- **Busy Timeout**: 5-second wait for database locks
+- **Cache Size**: Increased for better performance
+- **Single Connection**: Optimized for SQLite's architecture
+
+## Schema
+
+The adapter creates these tables automatically:
+
+- `workflow_records`: Store workflow execution records
+- `workflow_outbox`: Transactional outbox for events
+- `workflow_timeouts`: Timeout tracking with expiration
+- `workflow_events`: Event streaming log
+- `workflow_cursors`: Consumer position tracking
+
+## Usage Notes
+
+### Concurrency Limitations
+
+SQLite is designed for single-writer scenarios. While this adapter includes retry logic and optimizations:
+
+- ✅ **Good for**: Single-node applications, moderate load, development/testing
+- ⚠️ **Limited**: High-concurrency scenarios with many concurrent writers
+- ❌ **Not for**: Multi-node deployments, high-throughput production systems
+
+For high-concurrency scenarios, consider:
+- `sqlstore` + `sqltimeout` (MySQL/PostgreSQL)
+- `reflexstreamer` (dedicated event streaming)
+- `kafkastreamer` (Kafka-based streaming)
+
+### Event Streaming
+
+The EventStreamer implementation:
+- Stores events in SQLite tables (not in-memory)
+- Supports `StreamFromLatest()` option
+- Uses polling-based consumption (10ms intervals by default)
+- Includes automatic retry logic for database locks
+
+### Error Handling
+
+The adapter includes retry logic for common SQLite contention issues:
+- Automatic retry on `SQLITE_BUSY` errors
+- Exponential backoff for lock conflicts
+- Graceful handling of concurrent access patterns
+
+## Testing
+
+All adapters are tested against the standard adapter test suite:
+
+```bash
+go test -v
+```
+
+**Note**: The full `RunEventStreamerTest` may timeout in high-concurrency scenarios due to SQLite's single-writer nature. Individual interface tests pass completely.
+
+## Performance Characteristics
+
+- **Read Performance**: Excellent with proper indexing
+- **Write Performance**: Good for moderate loads
+- **Concurrent Reads**: Supported via WAL mode
+- **Concurrent Writes**: Limited by SQLite's single-writer design
+- **Storage**: Efficient, single-file database
+
+## Best Practices
+
+1. **Use for appropriate workloads**: Single-node, moderate concurrency
+2. **Monitor database size**: SQLite can handle large databases efficiently
+3. **Regular maintenance**: Use `PRAGMA optimize` periodically
+4. **Backup strategy**: Simple file-based backups work well
+5. **Connection management**: Use single connection per process
+
+## Comparison with Other Adapters
+
+| Feature | SQLite | SQL + Timeout | Reflex + Kafka | In-Memory |
+|---------|---------|---------------|----------------|-----------|
+| Setup Complexity | Low | Medium | High | None |
+| Production Ready | Limited | Yes | Yes | No |
+| Multi-Node | No | Yes | Yes | No |
+| Persistence | Yes | Yes | Yes | No |
+| High Concurrency | No | Yes | Yes | Yes |
+
+## Contributing
+
+This adapter follows the same patterns as other workflow adapters. When contributing:
+
+1. Run the full test suite
+2. Follow existing error handling patterns
+3. Maintain compatibility with the workflow interfaces
+4. Update documentation for any new features
+
+## License
+
+Same as the workflow library.

adapters/sqlite/example_test.go

@@ -0,0 +1,80 @@
+package sqlite_test
+
+import (
+	"context"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"github.com/luno/workflow"
+	"github.com/stretchr/testify/require"
+
+	"github.com/luno/workflow/adapters/sqlite"
+)
+
+func TestSQLiteAdapterExample(t *testing.T) {
+	// Create a temporary database
+	tempDir := t.TempDir()
+	dbPath := filepath.Join(tempDir, "example.db")
+
+	// Open SQLite database with optimized settings
+	db, err := sqlite.Open(dbPath)
+	require.NoError(t, err)
+	defer db.Close()
+
+	// Initialize schema
+	err = sqlite.InitSchema(db)
+	require.NoError(t, err)
+
+	// Create adapters
+	recordStore := sqlite.NewRecordStore(db)
+	timeoutStore := sqlite.NewTimeoutStore(db)
+	eventStreamer := sqlite.NewEventStreamer(db)
+
+	ctx := context.Background()
+
+	// Example: RecordStore usage
+	record := &workflow.Record{
+		WorkflowName: "example_workflow",
+		ForeignID:    "user-123",
+		RunID:        "run-456",
+		RunState:     workflow.RunStateInitiated,
+		Status:       1,
+		Object:       []byte(`{"data":"example"}`),
+		Meta:         workflow.Meta{StatusDescription: "example status"},
+	}
+
+	err = recordStore.Store(ctx, record)
+	require.NoError(t, err)
+
+	// Lookup record
+	retrieved, err := recordStore.Lookup(ctx, "run-456")
+	require.NoError(t, err)
+	require.Equal(t, "user-123", retrieved.ForeignID)
+
+	// Example: TimeoutStore usage
+	expireAt := time.Now().Add(1 * time.Hour)
+	err = timeoutStore.Create(ctx, "example_workflow", "user-123", "run-456", 1, expireAt)
+	require.NoError(t, err)
+
+	timeouts, err := timeoutStore.List(ctx, "example_workflow")
+	require.NoError(t, err)
+	require.Len(t, timeouts, 1)
+
+	// Example: EventStreamer usage (basic)
+	sender, err := eventStreamer.NewSender(ctx, "example_topic")
+	require.NoError(t, err)
+	defer sender.Close()
+
+	headers := map[workflow.Header]string{
+		workflow.HeaderTopic:        "example_topic",
+		workflow.HeaderWorkflowName: "example_workflow",
+		workflow.HeaderForeignID:    "user-123",
+	}
+
+	err = sender.Send(ctx, "user-123", 1, headers)
+	require.NoError(t, err)
+
+	t.Log("SQLite adapters created successfully!")
+	t.Log("Database file:", dbPath)
+}

adapters/sqlite/go.mod

@@ -0,0 +1,40 @@
+module github.com/luno/workflow/adapters/sqlite
+
+go 1.24.2
+
+replace github.com/luno/workflow => ../..
+
+require (
+	github.com/luno/workflow v0.3.0
+	github.com/stretchr/testify v1.10.0
+	modernc.org/sqlite v1.34.4
+)
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/hashicorp/golang-lru/v2 v2.0.7 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/ncruces/go-strftime v0.1.9 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/prometheus/client_golang v1.22.0 // indirect
+	github.com/prometheus/client_model v0.6.1 // indirect
+	github.com/prometheus/common v0.62.0 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	golang.org/x/exp v0.0.0-20231108232855-2478ac86f678 // indirect
+	golang.org/x/sys v0.31.0 // indirect
+	google.golang.org/protobuf v1.36.6 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	k8s.io/utils v0.0.0-20240921022957-49e7df575cb6 // indirect
+	modernc.org/gc/v3 v3.0.0-20241004144649-1aea3fae8852 // indirect
+	modernc.org/libc v1.61.4 // indirect
+	modernc.org/mathutil v1.6.0 // indirect
+	modernc.org/memory v1.8.0 // indirect
+	modernc.org/strutil v1.2.0 // indirect
+	modernc.org/token v1.1.0 // indirect
+)

adapters/sqlite/go.sum

@@ -0,0 +1,90 @@
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+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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