Move sql db out of post.NewStore, so it can be shared

srv/src/cmd/import-posts/main.go

@@ -133,13 +133,13 @@ func main() {
 		logger.FatalString(ctx, "no paths given")
 	}
 
-	postStore, err := post.NewStore(post.StoreParams{
-		DataDir: dataDir,
-	})
+	postDB, err := post.NewSQLDB(dataDir)
 	if err != nil {
-		logger.Fatal(ctx, "initializing post store", err)
+		logger.Fatal(ctx, "initializing post sql db", err)
 	}
-	defer postStore.Close()
+	defer postDB.Close()
+
+	postStore := post.NewStore(postDB)
 
 	for _, path := range *paths {
 

srv/src/post/sql.go

@@ -0,0 +1,69 @@
+package post
+
+import (
+	"database/sql"
+	"fmt"
+	"path"
+
+	"github.com/mediocregopher/blog.mediocregopher.com/srv/cfg"
+	migrate "github.com/rubenv/sql-migrate"
+)
+
+var migrations = []*migrate.Migration{
+	&migrate.Migration{
+		Id: "1",
+		Up: []string{
+			`CREATE TABLE posts (
+				id          TEXT NOT NULL PRIMARY KEY,
+				title       TEXT NOT NULL,
+				description TEXT NOT NULL,
+				series      TEXT,
+
+				published_at    INTEGER NOT NULL,
+				last_updated_at INTEGER,
+
+				body TEXT NOT NULL
+			)`,
+			`CREATE TABLE post_tags (
+				post_id TEXT NOT NULL,
+				tag     TEXT NOT NULL,
+				UNIQUE(post_id, tag)
+			)`,
+		},
+		Down: []string{
+			"DROP TABLE post_tags",
+			"DROP TABLE posts",
+		},
+	},
+}
+
+// SQLDB is a sqlite3 database which can be used by storage interfaces within
+// this package.
+type SQLDB struct {
+	db *sql.DB
+}
+
+// NewSQLDB initializes and returns a new sqlite3 database for post storage
+// intefaces. The db will  be created within the given data directory.
+func NewSQLDB(dataDir cfg.DataDir) (*SQLDB, error) {
+
+	path := path.Join(dataDir.Path, "post.sqlite3")
+
+	db, err := sql.Open("sqlite3", path)
+	if err != nil {
+		return nil, fmt.Errorf("opening sqlite file at %q: %w", path, err)
+	}
+
+	migrations := &migrate.MemoryMigrationSource{Migrations: migrations}
+
+	if _, err := migrate.Exec(db, "sqlite3", migrations, migrate.Up); err != nil {
+		return nil, fmt.Errorf("running migrations: %w", err)
+	}
+
+	return &SQLDB{db}, nil
+}
+
+// Close cleans up loose resources being held by the db.
+func (db *SQLDB) Close() error {
+	return db.db.Close()
+}

srv/src/post/store.go

@@ -9,8 +9,6 @@ import (
 	"time"
 
 	_ "github.com/mattn/go-sqlite3" // we need dis
-	"github.com/mediocregopher/blog.mediocregopher.com/srv/cfg"
-	migrate "github.com/rubenv/sql-migrate"
 )
 
 var (
@@ -69,66 +67,15 @@ type Store interface {
 	Close() error
 }
 
-var migrations = []*migrate.Migration{
-	&migrate.Migration{
-		Id: "1",
-		Up: []string{
-			`CREATE TABLE posts (
-				id          TEXT NOT NULL PRIMARY KEY,
-				title       TEXT NOT NULL,
-				description TEXT NOT NULL,
-				series      TEXT,
-
-				published_at    INTEGER NOT NULL,
-				last_updated_at INTEGER,
-
-				body TEXT NOT NULL
-			)`,
-			`CREATE TABLE post_tags (
-				post_id TEXT NOT NULL,
-				tag     TEXT NOT NULL,
-				UNIQUE(post_id, tag)
-			)`,
-		},
-		Down: []string{
-			"DROP TABLE post_tags",
-			"DROP TABLE posts",
-		},
-	},
-}
-
-// Params are parameters used to initialize a new Store. All fields are required
-// unless otherwise noted.
-type StoreParams struct {
-	DataDir cfg.DataDir
-}
-
 type store struct {
-	params StoreParams
-	db     *sql.DB
+	db *sql.DB
 }
 
-// NewStore initializes a new Store using a sqlite3 database at the given file
-// path.
-func NewStore(params StoreParams) (Store, error) {
-
-	path := path.Join(params.DataDir.Path, "post.sqlite3")
-
-	db, err := sql.Open("sqlite3", path)
-	if err != nil {
-		return nil, fmt.Errorf("opening sqlite file at %q: %w", path, err)
-	}
-
-	migrations := &migrate.MemoryMigrationSource{Migrations: migrations}
-
-	if _, err := migrate.Exec(db, "sqlite3", migrations, migrate.Up); err != nil {
-		return nil, fmt.Errorf("running migrations: %w", err)
-	}
-
+// NewStore initializes a new Store using an existing SQLDB.
+func NewStore(db *SQLDB) Store {
 	return &store{
-		params: params,
-		db:     db,
-	}, nil
+		db: db.db,
+	}
 }
 
 func (s *store) Close() error {
@@ -168,7 +115,7 @@ func (s *store) Set(post Post, now time.Time) error {
 
 		nowTS := now.Unix()
 
-		nowSql := sql.NullInt64{Int64: nowTS, Valid: !now.IsZero()}
+		nowSQL := sql.NullInt64{Int64: nowTS, Valid: !now.IsZero()}
 
 		_, err := tx.Exec(
 			`INSERT INTO posts (
@@ -186,9 +133,9 @@ func (s *store) Set(post Post, now time.Time) error {
 			post.Title,
 			post.Description,
 			&sql.NullString{String: post.Series, Valid: post.Series != ""},
-			nowSql,
+			nowSQL,
 			post.Body,
-			nowSql,
+			nowSQL,
 		)
 
 		if err != nil {

srv/src/post/store_test.go

@@ -38,14 +38,14 @@ func newStoreTestHarness(t *testing.T) storeTestHarness {
 
 	clock := clock.NewMock(time.Now().UTC().Truncate(1 * time.Hour))
 
-	store, err := NewStore(StoreParams{
-		DataDir: dataDir,
-	})
-	assert.NoError(t, err)
+	db, err := NewSQLDB(dataDir)
+	if err != nil {
+		t.Fatal(err)
+	}
 
-	t.Cleanup(func() {
-		assert.NoError(t, store.Close())
-	})
+	t.Cleanup(func() { db.Close() })
+
+	store := NewStore(db)
 
 	return storeTestHarness{
 		clock: clock,