drop custom query params

database/postgres/postgres.go

@@ -9,6 +9,7 @@ import (
 	nurl "net/url"
 
 	"github.com/lib/pq"
+	"github.com/mattes/migrate"
 	"github.com/mattes/migrate/database"
 )
 
@@ -30,6 +31,14 @@ type Config struct {
 	DatabaseName    string
 }
 
+type Postgres struct {
+	db       *sql.DB
+	isLocked bool
+
+	// Open and WithInstance need to garantuee that config is never nil
+	config *Config
+}
+
 func WithInstance(instance *sql.DB, config *Config) (database.Driver, error) {
 	if config == nil {
 		return nil, ErrNilConfig
@@ -63,21 +72,13 @@ func WithInstance(instance *sql.DB, config *Config) (database.Driver, error) {
 	return px, nil
 }
 
-type Postgres struct {
-	db       *sql.DB
-	isLocked bool
-
-	// Open and WithInstance need to garantuee that config is never nil
-	config *Config
-}
-
 func (p *Postgres) Open(url string) (database.Driver, error) {
 	purl, err := nurl.Parse(url)
 	if err != nil {
 		return nil, err
 	}
 
-	db, err := sql.Open("postgres", url)
+	db, err := sql.Open("postgres", migrate.FilterCustomQuery(purl).String())
 	if err != nil {
 		return nil, err
 	}
@@ -155,7 +156,7 @@ func (p *Postgres) Run(version int, migration io.Reader) error {
 	if dirty, err := p.isDirty(); err != nil {
 		return err
 	} else if dirty {
-		return ErrDatabaseDirty
+		return ErrDatabaseDirty // TODO: add more verbose error
 	}
 
 	if migration == nil {

database/postgres/postgres_test.go

@@ -78,6 +78,18 @@ func TestMultiStatement(t *testing.T) {
 		})
 }
 
+func TestFilterCustomQuery(t *testing.T) {
+	mt.ParallelTest(t, versions, isReady,
+		func(t *testing.T, i mt.Instance) {
+			p := &Postgres{}
+			addr := fmt.Sprintf("postgres://postgres@%v:%v/postgres?sslmode=disable&x-custom=foobar", i.Host(), i.Port())
+			_, err := p.Open(addr)
+			if err != nil {
+				t.Fatalf("%v", err)
+			}
+		})
+}
+
 func TestWithSchema(t *testing.T) {
 	mt.ParallelTest(t, versions, isReady,
 		func(t *testing.T, i mt.Instance) {

util.go

@@ -90,3 +90,16 @@ func schemeFromUrl(url string) (string, error) {
 
 	return u.Scheme, nil
 }
+
+// FilterCustomQuery filters all query values starting with `x-`
+func FilterCustomQuery(u *nurl.URL) *nurl.URL {
+	ux := *u
+	vx := make(nurl.Values)
+	for k, v := range ux.Query() {
+		if len(k) <= 1 || (len(k) > 1 && k[0:2] != "x-") {
+			vx[k] = v
+		}
+	}
+	ux.RawQuery = vx.Encode()
+	return &ux
+}

util_test.go

@@ -1,6 +1,7 @@
 package migrate
 
 import (
+	nurl "net/url"
 	"testing"
 )
 
@@ -18,3 +19,14 @@ func TestSuint(t *testing.T) {
 		t.Fatalf("expected 0, got %v", u)
 	}
 }
+
+func TestFilterCustomQuery(t *testing.T) {
+	n, err := nurl.Parse("foo://host?a=b&x-custom=foo&c=d")
+	if err != nil {
+		t.Fatal(err)
+	}
+	nx := FilterCustomQuery(n).Query()
+	if nx.Get("x-custom") != "" {
+		t.Fatalf("didn't expect x-custom")
+	}
+}