refactoring

kvmd/apps/vnc/rfb/encodings.py

@@ -0,0 +1,69 @@
+# ========================================================================== #
+#                                                                            #
+#    KVMD - The main Pi-KVM daemon.                                          #
+#                                                                            #
+#    Copyright (C) 2020  Maxim Devaev <mdevaev@gmail.com>                    #
+#                                                                            #
+#    This program is free software: you can redistribute it and/or modify    #
+#    it under the terms of the GNU General Public License as published by    #
+#    the Free Software Foundation, either version 3 of the License, or       #
+#    (at your option) any later version.                                     #
+#                                                                            #
+#    This program is distributed in the hope that it will be useful,         #
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of          #
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           #
+#    GNU General Public License for more details.                            #
+#                                                                            #
+#    You should have received a copy of the GNU General Public License       #
+#    along with this program.  If not, see <https://www.gnu.org/licenses/>.  #
+#                                                                            #
+# ========================================================================== #
+
+
+import dataclasses
+
+from typing import FrozenSet
+from typing import Any
+
+
+# =====
+class RfbEncodings:
+    RESIZE = -223  # DesktopSize Pseudo-encoding
+    RENAME = -307  # DesktopName Pseudo-encoding
+    LEDS_STATE = -261  # LED State Pseudo-encoding
+
+    TIGHT = 7
+    TIGHT_JPEG_QUALITIES = dict(zip(  # JPEG Quality Level Pseudo-encoding
+        [-32, -31, -30, -29, -28, -27, -26, -25, -24, -23],
+        [10,   20,  30,  40,  50,  60,  70,  80,  90, 100],
+    ))
+
+
+@dataclasses.dataclass(frozen=True)
+class RfbClientEncodings:
+    encodings: FrozenSet[int]
+
+    has_resize: bool = dataclasses.field(default=False)
+    has_rename: bool = dataclasses.field(default=False)
+    has_leds_state: bool = dataclasses.field(default=False)
+
+    has_tight: bool = dataclasses.field(default=False)
+    tight_jpeg_quality: int = dataclasses.field(default=0)
+
+    def __post_init__(self) -> None:
+        self.__set("has_resize", (RfbEncodings.RESIZE in self.encodings))
+        self.__set("has_rename", (RfbEncodings.RENAME in self.encodings))
+        self.__set("has_leds_state", (RfbEncodings.LEDS_STATE in self.encodings))
+
+        self.__set("has_tight", (RfbEncodings.TIGHT in self.encodings))
+        self.__set("tight_jpeg_quality", self.__get_tight_jpeg_quality())
+
+    def __set(self, key: str, value: Any) -> None:
+        object.__setattr__(self, key, value)
+
+    def __get_tight_jpeg_quality(self) -> int:
+        if RfbEncodings.TIGHT in self.encodings:
+            qualities = self.encodings.intersection(RfbEncodings.TIGHT_JPEG_QUALITIES)
+            if qualities:
+                return RfbEncodings.TIGHT_JPEG_QUALITIES[max(qualities)]
+        return 0