Move pkg/ice to internal/ice

Avoid exposing any non-standard API.

errors.go

@@ -0,0 +1,31 @@
+package ice
+
+import (
+	"github.com/pkg/errors"
+)
+
+var (
+	// ErrUnknownType indicates an error with Unknown info.
+	ErrUnknownType = errors.New("Unknown")
+
+	// ErrSchemeType indicates the scheme type could not be parsed.
+	ErrSchemeType = errors.New("unknown scheme type")
+
+	// ErrSTUNQuery indicates query arguments are provided in a STUN URL.
+	ErrSTUNQuery = errors.New("queries not supported in stun address")
+
+	// ErrInvalidQuery indicates an malformed query is provided.
+	ErrInvalidQuery = errors.New("invalid query")
+
+	// ErrHost indicates malformed hostname is provided.
+	ErrHost = errors.New("invalid hostname")
+
+	// ErrPort indicates malformed port is provided.
+	ErrPort = errors.New("invalid port")
+
+	// ErrProtoType indicates an unsupported transport type was provided.
+	ErrProtoType = errors.New("invalid transport protocol type")
+
+	// ErrClosed indicates the agent is closed
+	ErrClosed = errors.New("the agent is closed")
+)