Add basic Save and Get operations to the event store

management/server/event/event.go

@@ -11,25 +11,45 @@ const (
 
 type Type string
 
-// Sink provides an interface to store or stream events.
-type Sink interface {
-	// Add an event to the sink.
-	Add(event *Event) error
+// Store provides an interface to store or stream events.
+type Store interface {
+	// Save an event in the store
+	Save(event Event) (*Event, error)
+	// GetSince returns a list of events from the store for a given account since the specified time
+	GetSince(accountID string, from time.Time) ([]Event, error)
+	// GetLast returns a top N of events from the store for a given account (ordered by timestamp desc)
+	GetLast(accountID string, limit int) ([]Event, error)
 	// Close the sink flushing events if necessary
 	Close() error
 }
 
-// Event represents a network activity event.
+// Event represents a network/system activity event.
 type Event struct {
 	// Timestamp of the event
 	Timestamp time.Time
-	// Message of the event
-	Message string
+	// Operation that was performed during the event
+	Operation string
 	// ID of the event (can be empty, meaning that it wasn't yet generated)
 	ID uint64
 	// Type of the event
 	Type Type
-
-	//
-
+	// ModifierID is the ID of an object that modifies a Target
+	ModifierID string
+	// TargetID is the ID of an object that a Modifier modifies
+	TargetID string
+	// AccountID where event happened
+	AccountID string
+}
+
+// Copy the event
+func (e *Event) Copy() *Event {
+	return &Event{
+		Timestamp:  e.Timestamp,
+		Operation:  e.Operation,
+		ID:         e.ID,
+		Type:       e.Type,
+		ModifierID: e.ModifierID,
+		TargetID:   e.TargetID,
+		AccountID:  e.AccountID,
+	}
 }

management/server/event/sqlite.go

@@ -2,23 +2,31 @@ package event
 
 import (
 	"database/sql"
-	"fmt"
 	_ "github.com/mattn/go-sqlite3"
+	"path/filepath"
+	"time"
 )
 
 const (
 	SQLiteEventSinkDB = "events.db"
 	createTableQuery  = "CREATE TABLE IF NOT EXISTS events " +
-		"(id UNSIGNED BIG INT PRIMARY KEY AUTOINCREMENT, message TEXT, timestamp DATETIME);"
+		"(id INTEGER PRIMARY KEY AUTOINCREMENT, account TEXT NOT NULL, " +
+		"operation TEXT, " +
+		"type TEXT, " +
+		"timestamp DATETIME, " +
+		"modifier TEXT," +
+		" target TEXT);"
 )
 
-type SQLiteSink struct {
+// SQLiteStore is the implementation of the event.Store interface backed by SQLite
+type SQLiteStore struct {
 	db *sql.DB
 }
 
-// NewSQLiteSink creates a new SQLiteSink with an event table if not exists.
-func NewSQLiteSink(dbPath string) (*SQLiteSink, error) {
-	db, err := sql.Open("sqlite3", dbPath)
+// NewSQLiteStore creates a new SQLiteStore with an event table if not exists.
+func NewSQLiteStore(dataDir string) (*SQLiteStore, error) {
+	dbFile := filepath.Join(dataDir, SQLiteEventSinkDB)
+	db, err := sql.Open("sqlite3", dbFile)
 	if err != nil {
 		return nil, err
 	}
@@ -28,39 +36,102 @@ func NewSQLiteSink(dbPath string) (*SQLiteSink, error) {
 		return nil, err
 	}
 
-	return &SQLiteSink{db: db}, nil
+	return &SQLiteStore{db: db}, nil
 }
 
-// Add an event to the SQLite table
-func (sink *SQLiteSink) Add(event *Event) error {
+func processResult(result *sql.Rows) ([]Event, error) {
+	events := make([]Event, 0)
+	for result.Next() {
+		var id int64
+		var operation string
+		var timestamp time.Time
+		var modifier string
+		var target string
+		var account string
+		var typ Type
+		err := result.Scan(&id, &operation, &timestamp, &modifier, &target, &account, &typ)
+		if err != nil {
+			return nil, err
+		}
 
-	_, err := sink.db.Exec(createTableQuery)
-	if err != nil {
-		return err
+		events = append(events, Event{
+			Timestamp:  timestamp,
+			Operation:  operation,
+			ID:         uint64(id),
+			Type:       typ,
+			ModifierID: modifier,
+			TargetID:   target,
+			AccountID:  account,
+		})
 	}
 
-	stmt, err := sink.db.Prepare("INSERT INTO events(message, timestamp) values(?, ?)")
+	return events, nil
+}
+
+// GetLast returns a top N of events from the store for a given account (ordered by timestamp desc)
+func (store *SQLiteStore) GetLast(accountID string, limit int) ([]Event, error) {
+	stmt, err := store.db.Prepare("SELECT id, operation, timestamp, modifier, target, account, type" +
+		" FROM events WHERE account = ? ORDER BY timestamp DESC limit ?;")
 	if err != nil {
-		return err
+		return nil, err
 	}
 
-	result, err := stmt.Exec(event.Message, event.Timestamp)
+	result, err := stmt.Query(accountID, limit)
+	if err != nil {
+		return nil, err
+	}
+
+	defer result.Close() //nolint
+	return processResult(result)
+}
+
+// GetSince returns a list of events from the store for a given account since the specified time
+func (store *SQLiteStore) GetSince(accountID string, from time.Time) ([]Event, error) {
+	stmt, err := store.db.Prepare("SELECT id, operation, timestamp, modifier, target, account, type" +
+		" FROM events WHERE account = ? and timestamp >= ?;")
+	if err != nil {
+		return nil, err
+	}
+
+	result, err := stmt.Query(accountID, from)
+	if err != nil {
+		return nil, err
+	}
+
+	defer result.Close() //nolint
+	return processResult(result)
+}
+
+// Save an event in the SQLite events table
+func (store *SQLiteStore) Save(event Event) (*Event, error) {
+
+	stmt, err := store.db.Prepare("INSERT INTO events(operation, timestamp, modifier, target, account, type) VALUES(?, ?, ?, ?, ?, ?)")
+	if err != nil {
+		return nil, err
+	}
+
+	result, err := stmt.Exec(event.Operation, event.Timestamp, event.ModifierID, event.TargetID, event.AccountID, event.Type)
 	if err != nil {
 		if err == sql.ErrNoRows {
 			// Handle the case of no rows returned.
 		}
-		return album, err
+		return nil, err
 	}
 
-	fmt.Println(result)
+	id, err := result.LastInsertId()
+	if err != nil {
+		return nil, err
+	}
 
-	return nil
+	eventCopy := event.Copy()
+	eventCopy.ID = uint64(id)
+	return eventCopy, nil
 }
 
-// Close the SQLiteSink
-func (sink *SQLiteSink) Close() error {
-	if sink.db != nil {
-		return sink.db.Close()
+// Close the SQLiteStore
+func (store *SQLiteStore) Close() error {
+	if store.db != nil {
+		return store.db.Close()
 	}
 	return nil
 }

management/server/event/sqlite_test.go

@@ -0,0 +1,47 @@
+package event
+
+import (
+	"fmt"
+	"testing"
+	"time"
+)
+
+func TestNewSQLiteStore(t *testing.T) {
+	dataDir := t.TempDir()
+	store, err := NewSQLiteStore(dataDir)
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+
+	accountID := "account_1"
+	eventTime := time.Now()
+	_, err = store.Save(Event{
+		Timestamp:  eventTime,
+		Operation:  "cool operation",
+		Type:       ManagementEvent,
+		ModifierID: "user_1",
+		TargetID:   "peer_1",
+		AccountID:  accountID,
+	})
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+
+	result, err := store.GetSince(accountID, eventTime.Add(-10*time.Second))
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+
+	fmt.Println(result)
+
+	result, err = store.GetLast(accountID, 10)
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+
+	fmt.Println(result)
+}