Add the nocgo build flag to enable a build without sqlite3

app/data/data.go

@@ -4,15 +4,13 @@ import (
 	"fmt"
 	"net/url"
 
-	"github.com/lib/pq"
-
 	my "github.com/go-sql-driver/mysql"
 	"github.com/jmoiron/sqlx"
 	"github.com/keratin/authn-server/app/data/mock"
 	"github.com/keratin/authn-server/app/data/mysql"
 	"github.com/keratin/authn-server/app/data/postgres"
 	"github.com/keratin/authn-server/app/data/sqlite3"
-	sq3 "github.com/mattn/go-sqlite3"
+	"github.com/lib/pq"
 )
 
 func NewDB(url *url.URL) (*sqlx.DB, error) {
@@ -61,8 +59,8 @@ func MigrateDB(url *url.URL) error {
 
 func IsUniquenessError(err error) bool {
 	switch i := err.(type) {
-	case sq3.Error:
-		return i.ExtendedCode == sq3.ErrConstraintUnique
+	case sqlite3.Error:
+		return i.ExtendedCode == sqlite3.ErrConstraintUnique
 	case *my.MySQLError:
 		return i.Number == 1062
 	case *pq.Error:

app/data/sqlite3/blob_store.go

@@ -1,3 +1,5 @@
+// +build !nocgo
+
 package sqlite3
 
 import (

app/data/sqlite3/blob_store_nocgo.go

@@ -0,0 +1,33 @@
+// +build nocgo
+
+// This stub package allows authn-server to be build without CGO, i.e. with CGO_ENABLED=0. This has numerous advantages
+// including on toolchains where static linking is impossible. In order to use it run with `go build -tags nocgo`.
+
+package sqlite3
+
+import (
+	"time"
+
+	"github.com/jmoiron/sqlx"
+	"github.com/keratin/authn-server/ops"
+)
+
+var placeholder = "generating"
+
+type BlobStore struct {
+	TTL      time.Duration
+	LockTime time.Duration
+	DB       sqlx.Ext
+}
+
+func (s *BlobStore) Clean(reporter ops.ErrorReporter) {
+	panic("Cannot use sqlite3 BlobStore because building with nocgo build tag")
+}
+
+func (s *BlobStore) Read(name string) ([]byte, error) {
+	panic("Cannot use sqlite3 BlobStore because building with nocgo build tag")
+}
+
+func (s *BlobStore) WriteNX(name string, blob []byte) (bool, error) {
+	panic("Cannot use sqlite3 BlobStore because building with nocgo build tag")
+}

app/data/sqlite3/blob_store_test.go

@@ -1,3 +1,5 @@
+// +build !nocgo
+
 package sqlite3_test
 
 import (

app/data/sqlite3/db.go

@@ -1,3 +1,5 @@
+// +build !nocgo
+
 package sqlite3
 
 import (
@@ -6,19 +8,23 @@ import (
 
 	"github.com/jmoiron/sqlx"
 	// load sqlite3 library with side effects
-	_ "github.com/mattn/go-sqlite3"
+	sq3 "github.com/mattn/go-sqlite3"
 )
 
+type Error = sq3.Error
+
+var ErrConstraintUnique = sq3.ErrConstraintUnique
+
 func NewDB(env string) (*sqlx.DB, error) {
 	// https://github.com/mattn/go-sqlite3/issues/274#issuecomment-232942571
 	// enable a busy timeout for concurrent load. keep it short. the busy timeout can be harmful
 	// under sustained load, but helpful during short bursts.
-	
-	// this block used to keep backward compatibility 
+
+	// this block used to keep backward compatibility
 	if !strings.Contains(env, ".") {
-		env = "./"+ env +".db"
+		env = "./" + env + ".db"
 	}
-	
+
 	return sqlx.Connect("sqlite3", fmt.Sprintf("%v?cache=shared&_busy_timeout=200", env))
 }
 

app/data/sqlite3/db_nocgo.go

@@ -0,0 +1,28 @@
+// +build nocgo
+
+// This stub package allows authn-server to be build without CGO, i.e. with CGO_ENABLED=0. This has numerous advantages
+// including on toolchains where static linking is impossible. In order to use it run with `go build -tags nocgo`.
+
+package sqlite3
+
+import (
+	"github.com/jmoiron/sqlx"
+)
+
+type Error struct {
+	ExtendedCode int
+}
+
+func (Error) Error() string {
+	panic("Cannot use sqlite3 Error because building with nocgo build tag")
+}
+
+var ErrConstraintUnique int
+
+func NewDB(env string) (*sqlx.DB, error) {
+	panic("Cannot use sqlite3 DB because building with nocgo build tag")
+}
+
+func TestDB() (*sqlx.DB, error) {
+	panic("Cannot use sqlite3 DB because building with nocgo build tag")
+}