Make ServiceDB an interface called `Storer`

Implement a nop `Storer` called `NopStorage` which tests can make use of.
This was awful to write.

src/github.com/matrix-org/go-neb/database/db.go

@@ -17,15 +17,15 @@ type ServiceDB struct {
 // A single global instance of the service DB.
 // XXX: I can't think of any way of doing this without one without creating
 //      cyclical dependencies somewhere -- Kegan
-var globalServiceDB *ServiceDB
+var globalServiceDB Storer
 
 // SetServiceDB sets the global service DB instance.
-func SetServiceDB(db *ServiceDB) {
+func SetServiceDB(db Storer) {
 	globalServiceDB = db
 }
 
 // GetServiceDB gets the global service DB instance.
-func GetServiceDB() *ServiceDB {
+func GetServiceDB() Storer {
 	return globalServiceDB
 }
 

src/github.com/matrix-org/go-neb/database/interface.go

@@ -0,0 +1,140 @@
+package database
+
+import (
+	"github.com/matrix-org/go-neb/api"
+	"github.com/matrix-org/go-neb/types"
+)
+
+// Storer is the interface which needs to be conformed to in order to persist Go-NEB data
+type Storer interface {
+	StoreMatrixClientConfig(config api.ClientConfig) (oldConfig api.ClientConfig, err error)
+	LoadMatrixClientConfigs() (configs []api.ClientConfig, err error)
+	LoadMatrixClientConfig(userID string) (config api.ClientConfig, err error)
+
+	UpdateNextBatch(userID, nextBatch string) (err error)
+	LoadNextBatch(userID string) (nextBatch string, err error)
+
+	LoadService(serviceID string) (service types.Service, err error)
+	DeleteService(serviceID string) (err error)
+	LoadServicesForUser(serviceUserID string) (services []types.Service, err error)
+	LoadServicesByType(serviceType string) (services []types.Service, err error)
+	StoreService(service types.Service) (oldService types.Service, err error)
+
+	LoadAuthRealm(realmID string) (realm types.AuthRealm, err error)
+	LoadAuthRealmsByType(realmType string) (realms []types.AuthRealm, err error)
+	StoreAuthRealm(realm types.AuthRealm) (old types.AuthRealm, err error)
+
+	StoreAuthSession(session types.AuthSession) (old types.AuthSession, err error)
+	LoadAuthSessionByUser(realmID, userID string) (session types.AuthSession, err error)
+	LoadAuthSessionByID(realmID, sessionID string) (session types.AuthSession, err error)
+	RemoveAuthSession(realmID, userID string) error
+
+	LoadBotOptions(userID, roomID string) (opts types.BotOptions, err error)
+	StoreBotOptions(opts types.BotOptions) (oldOpts types.BotOptions, err error)
+
+	InsertFromConfig(cfg *api.ConfigFile) error
+}
+
+// NopStorage nops every store API call. This is intended to be embedded into derived structs
+// in tests
+type NopStorage struct{}
+
+// StoreMatrixClientConfig NOP
+func (s *NopStorage) StoreMatrixClientConfig(config api.ClientConfig) (oldConfig api.ClientConfig, err error) {
+	return api.ClientConfig{}, nil
+}
+
+// LoadMatrixClientConfigs NOP
+func (s *NopStorage) LoadMatrixClientConfigs() (configs []api.ClientConfig, err error) {
+	return
+}
+
+// LoadMatrixClientConfig NOP
+func (s *NopStorage) LoadMatrixClientConfig(userID string) (config api.ClientConfig, err error) {
+	return
+}
+
+// UpdateNextBatch NOP
+func (s *NopStorage) UpdateNextBatch(userID, nextBatch string) (err error) {
+	return
+}
+
+// LoadNextBatch NOP
+func (s *NopStorage) LoadNextBatch(userID string) (nextBatch string, err error) {
+	return
+}
+
+// LoadService NOP
+func (s *NopStorage) LoadService(serviceID string) (service types.Service, err error) {
+	return
+}
+
+// DeleteService NOP
+func (s *NopStorage) DeleteService(serviceID string) (err error) {
+	return
+}
+
+// LoadServicesForUser NOP
+func (s *NopStorage) LoadServicesForUser(serviceUserID string) (services []types.Service, err error) {
+	return
+}
+
+// LoadServicesByType NOP
+func (s *NopStorage) LoadServicesByType(serviceType string) (services []types.Service, err error) {
+	return
+}
+
+// StoreService NOP
+func (s *NopStorage) StoreService(service types.Service) (oldService types.Service, err error) {
+	return
+}
+
+// LoadAuthRealm NOP
+func (s *NopStorage) LoadAuthRealm(realmID string) (realm types.AuthRealm, err error) {
+	return
+}
+
+// LoadAuthRealmsByType NOP
+func (s *NopStorage) LoadAuthRealmsByType(realmType string) (realms []types.AuthRealm, err error) {
+	return
+}
+
+// StoreAuthRealm NOP
+func (s *NopStorage) StoreAuthRealm(realm types.AuthRealm) (old types.AuthRealm, err error) {
+	return
+}
+
+// StoreAuthSession NOP
+func (s *NopStorage) StoreAuthSession(session types.AuthSession) (old types.AuthSession, err error) {
+	return
+}
+
+// LoadAuthSessionByUser NOP
+func (s *NopStorage) LoadAuthSessionByUser(realmID, userID string) (session types.AuthSession, err error) {
+	return
+}
+
+// LoadAuthSessionByID NOP
+func (s *NopStorage) LoadAuthSessionByID(realmID, sessionID string) (session types.AuthSession, err error) {
+	return
+}
+
+// RemoveAuthSession NOP
+func (s *NopStorage) RemoveAuthSession(realmID, userID string) error {
+	return nil
+}
+
+// LoadBotOptions NOP
+func (s *NopStorage) LoadBotOptions(userID, roomID string) (opts types.BotOptions, err error) {
+	return
+}
+
+// StoreBotOptions NOP
+func (s *NopStorage) StoreBotOptions(opts types.BotOptions) (oldOpts types.BotOptions, err error) {
+	return
+}
+
+// InsertFromConfig NOP
+func (s *NopStorage) InsertFromConfig(cfg *api.ConfigFile) error {
+	return nil
+}

src/github.com/matrix-org/go-neb/services/rssbot/rssbot_test.go

@@ -7,7 +7,6 @@ import (
 	"github.com/matrix-org/go-neb/database"
 	"github.com/matrix-org/go-neb/matrix"
 	"github.com/matrix-org/go-neb/types"
-	_ "github.com/mattn/go-sqlite3"
 	"io/ioutil"
 	"net/http"
 	"net/url"
@@ -45,16 +44,7 @@ func (t MockTransport) RoundTrip(req *http.Request) (*http.Response, error) {
 }
 
 func TestHTMLEntities(t *testing.T) {
-	// FIXME: Make ServiceDB an interface so we don't need to do this and import sqlite3!
-	//        We are NOT interested in db operations, but need them because OnPoll will
-	//        call StoreService.
-	db, err := database.Open("sqlite3", ":memory:")
-	if err != nil {
-		t.Fatal("Failed to create in-memory db: ", err)
-		return
-	}
-	database.SetServiceDB(db)
-
+	database.SetServiceDB(&database.NopStorage{})
 	feedURL := "https://thehappymaskshop.hyrule"
 	// Replace the cachingClient with a mock so we can intercept RSS requests
 	rssTrans := struct{ MockTransport }{}