Error logging.

config.go

@@ -1,9 +1,14 @@
 package sqlite3
 
-import "github.com/ncruces/go-sqlite3/internal/util"
+import (
+	"context"
+
+	"github.com/ncruces/go-sqlite3/internal/util"
+	"github.com/tetratelabs/wazero/api"
+)
 
 // Config makes configuration changes to a database connection.
-// Only bool configuratiton options are supported.
+// Only boolean configuration options are supported.
 // Called with no arg reads the current configuration value,
 // called with one arg sets and returns the new value.
 //
@@ -27,3 +32,26 @@ func (c *Conn) Config(op DBConfig, arg ...bool) (bool, error) {
 		uint64(op), uint64(argsPtr))
 	return util.ReadUint32(c.mod, argsPtr) != 0, c.error(r)
 }
+
+// ConfigLog sets up the  error logging callback for the connection.
+//
+// https://www.sqlite.org/errlog.html
+func (c *Conn) ConfigLog(cb func(code ExtendedErrorCode, msg string)) error {
+	var enable uint64
+	if cb != nil {
+		enable = 1
+	}
+	r := c.call("sqlite3_config_log_go", enable)
+	if err := c.error(r); err != nil {
+		return err
+	}
+	c.log = cb
+	return nil
+}
+
+func logCallback(ctx context.Context, mod api.Module, _, iCode, zMsg uint32) {
+	if c, ok := ctx.Value(connKey{}).(*Conn); ok && c.log != nil {
+		msg := util.ReadString(mod, zMsg, _MAX_LENGTH)
+		c.log(xErrorCode(iCode), msg)
+	}
+}