287 lines
12 KiB
Plaintext
287 lines
12 KiB
Plaintext
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{
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"cells": [
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{
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"cell_type": "code",
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"execution_count": 1,
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"metadata": {},
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"outputs": [],
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"source": [
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"\"\"\"\n",
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"The module read_binary_format defines the function that reads \n",
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"the stream of data from Secondo server which contains the result\n",
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"of commands/ queries in binary format and decodes them to textual format.\n",
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"\"\"\"\n",
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"from struct import *\n",
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"\n",
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"import asyncio\n",
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"import nest_asyncio\n",
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"nest_asyncio.apply()\n",
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"\n",
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"from libs_pkg.exception_handler import *\n",
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"\n",
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"async def binary_decode(reader):\n",
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" \"\"\"\n",
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" This function binary_decode() reads a binary byte from stream of data from Secondo server \n",
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" which contains the result of commands/ queries in binary format. The read byte represents\n",
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" the type of next element in the stream. The function then decodes the element to textual format according\n",
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" to read type.\n",
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"\n",
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" :param reader: The stream reader of the Secondo object that receives the result from Secondo Server.\n",
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" :return: The decoded element in the result list.\n",
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" \"\"\"\n",
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" \n",
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" if reader == None:\n",
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" reader.close()\n",
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" raise SecondoAPI_ERROR('Connection to Secondo reset.')\n",
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" else: \n",
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" Typ = await reader.readexactly(1)\n",
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" Typ = int.from_bytes(Typ, byteorder='big', signed=False)\n",
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" \n",
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" Type_dict = {\"BIN_LONGLIST\": 0,\n",
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" \"BIN_INTEGER\": 1,\n",
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" \"BIN_REAL\": 2,\n",
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" \"BIN_BOOLEAN\": 3,\n",
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" \"BIN_LONGSTRING\": 4,\n",
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" \"BIN_LONGSYMBOL\": 5,\n",
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" \"BIN_LONGTEXT\": 6,\n",
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" \"BIN_LIST\": 10,\n",
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" \"BIN_SHORTLIST\": 11,\n",
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" \"BIN_SHORTINT\": 12,\n",
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" \"BIN_BYTE\":13,\n",
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" \"BIN_STRING\": 14,\n",
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" \"BIN_SHORTSTRING\": 15,\n",
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" \"BIN_SYMBOL\": 16,\n",
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" \"BIN_SHORTSYMBOL\": 17,\n",
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" \"BIN_TEXT\": 18,\n",
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" \"BIN_SHORTTEXT\": 19,\n",
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" \"BIN_DOUBLE\": 20}\n",
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" type_code = None\n",
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" for typ, val in Type_dict.items():\n",
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" if val == Typ:\n",
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" type_code = val\n",
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" break\n",
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" \n",
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" if type_code == 0: #LongList\n",
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" LE = []\n",
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" barray = bytearray(4) ####readInt()\n",
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" barray = await reader.readexactly(4)\n",
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" assert (int.from_bytes(barray, byteorder = 'big', signed = True)) >= 0, \"Invalid Integer-Byte read from Stream!\"\n",
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" r = unpack('>I',barray)[0]\n",
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" if r == 0:\n",
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" return LE\n",
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" else:\n",
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" for i in range(r):\n",
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" LE.append(await binary_decode(reader))\n",
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" return LE\n",
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" \n",
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" elif type_code == 1:\n",
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" ####readInt()\n",
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" barray = bytearray(4)\n",
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" barray = await reader.readexactly(4)\n",
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" assert (int.from_bytes(barray, byteorder = 'big', signed = True)) >= 0, \"Invalid Integer-Byte read from Stream!\"\n",
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" r = unpack('>I',barray)[0]\n",
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" return r \n",
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" \n",
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" elif type_code == 2:\n",
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" ####readReal()\n",
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" barray = bytearray(4)\n",
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" barray = await reader.readexactly(4)\n",
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" assert (int.from_bytes(barray, order = 'big', signed = True)) >= 0, \"Invalid Real-Byte read from Stream!\"\n",
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" r = unpack('>f',barray)[0]\n",
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" return r \n",
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" \n",
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" elif type_code == 3:\n",
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" ####readBool()\n",
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" barray = bytearray(1)\n",
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" barray = await reader.readexactly(1)\n",
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" assert (int.from_bytes(barray, order = 'big', signed = True)) >= 0, \"Invalid Boolean-Byte read from Stream!\"\n",
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" r = unpack('?',barray)[0]\n",
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" return r\n",
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" \n",
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" \n",
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" elif type_code == 4:\n",
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" ####readLongString()\n",
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" barray = bytearray(4) #readInt()\n",
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" barray = await reader.readexactly(4)\n",
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" for b in barray:\n",
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" assert (int.from_bytes(b, order = 'big', signed = True)) >= 0, \"Invalid Int-Byte read from Stream!\"\n",
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" len = unpack('>I',barray)[0]\n",
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" barray = bytearray(len)\n",
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" barray = await reader.readexactly(len)\n",
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" return '\"' + barray.decode() + '\"'\n",
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" \n",
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" elif type_code == 5:\n",
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" ####readLongSymbol()\n",
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" barray = bytearray(4) #readInt()\n",
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" barray = await reader.readexactly(4)\n",
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" for b in barray:\n",
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" assert (int.from_bytes(b, order = 'big', signed = True)) >= 0, \"Invalid Int-Byte read from Stream!\"\n",
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" len = unpack('>I',barray)[0]\n",
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" barray = bytearray(len)\n",
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" barray = await reader.readexactly(len)\n",
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" return barray.decode()\n",
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" \n",
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" elif type_code == 6:\n",
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" ####readLongText()\n",
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" barray = bytearray(4) #readInt()\n",
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" barray = await reader.readexactly(4)\n",
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" for b in barray:\n",
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" assert (int.from_bytes(b, order = 'big', signed = True)) >= 0, \"Invalid Int-Byte read from Stream!\"\n",
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" len = unpack('>I',barray)[0]\n",
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" barray = bytearray(len)\n",
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" barray = await reader.readexactly(len)\n",
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" txt = barray.decode()\n",
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" if not txt.startswith('<text>'):\n",
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" txt = '\"<text>' + txt + '</text--->\"'\n",
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" return txt\n",
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" \n",
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" elif type_code == 10: #List\n",
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" LE = []\n",
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" ####readShort()\n",
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" barray = bytearray(2)\n",
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" barray = await reader.readexactly(2)\n",
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" for b in barray:\n",
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" assert (int.from_bytes(b, order = 'big', signed = True)) >= 0, \"Invalid ShortInt-Byte read from Stream!\"\n",
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" r = unpack('>H',barray)[0]\n",
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" if r == 0:\n",
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" return LE\n",
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" else:\n",
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" for i in range(r):\n",
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" LE.append(await binary_decode(reader))\n",
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" return LE\n",
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" \n",
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" elif type_code == 11: #ShortList\n",
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" LE = []\n",
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" ####readByte()\n",
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" barray = bytearray(1)\n",
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" barray = await reader.readexactly(1)\n",
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" r = int.from_bytes(barray, byteorder = 'big', signed = False)\n",
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" if r == 0:\n",
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" return LE\n",
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" else:\n",
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" for i in range(r):\n",
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" LE.append(await binary_decode(reader))\n",
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" return LE\n",
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" \n",
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" elif type_code == 12:\n",
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" ####readShort()\n",
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" barray = bytearray(2)\n",
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" barray = await reader.readexactly(2)\n",
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" r = unpack('>H',barray)[0]\n",
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" return r\n",
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" \n",
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" elif type_code == 13:\n",
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" ####readByte()\n",
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" barray = bytearray(1)\n",
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" barray = await reader.readexactly(1)\n",
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" r = int.from_bytes(barray, byteorder = 'big', signed = True)\n",
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" return r\n",
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" \n",
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" elif type_code == 14:\n",
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" ####readString()\n",
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" barray = bytearray(2)\n",
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" barray = await reader.readexactly(2)\n",
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" for b in barray:\n",
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" assert (int.from_bytes(b, byteorder = 'big', signed = True)) >= 0, \"Invalid ShortInt-Byte read from Stream!\"\n",
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" len = unpack('>H',barray)[0]\n",
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" barray = bytearray(len)\n",
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" barray = await reader.readexactly(len)\n",
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" return '\"' + barray.decode() + '\"'\n",
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" \n",
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" elif type_code == 15:\n",
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" ####readShortString()\n",
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" barray = bytearray(1)\n",
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" barray = await reader.readexactly(1)\n",
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" len = int.from_bytes(barray, byteorder = 'big', signed = False)\n",
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" barray = bytearray(len)\n",
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" barray = await reader.readexactly(len)\n",
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" return '\"' + barray.decode() + '\"'\n",
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" \n",
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" elif type_code == 16:\n",
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" ####readSymbol()\n",
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" barray = bytearray(2) #readShort()\n",
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" barray = await reader.readexactly(2)\n",
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" for b in barray:\n",
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" assert (int.from_bytes(b, byteorder = 'big', signed = True)) >= 0, \"Invalid ShortInt-Byte read from Stream!\"\n",
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" len = unpack('>H',barray)[0]\n",
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" barray = bytearray(len)\n",
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" barray = await reader.readexactly(len)\n",
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" return barray.decode()\n",
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" \n",
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" elif type_code == 17:\n",
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" ####readShortSymbol()\n",
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" barray = bytearray(1) #readByte()\n",
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" barray = await reader.readexactly(1)\n",
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" len = int.from_bytes(barray, byteorder = 'big', signed = False)\n",
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" barray = bytearray(len)\n",
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" barray = await reader.readexactly(len)\n",
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" return barray.decode()\n",
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" \n",
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" elif type_code == 18:\n",
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" ####readText()\n",
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" barray = bytearray(2) #readShort()\n",
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" barray = await reader.readexactly(2)\n",
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" len = unpack('>H',barray)[0]\n",
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" barray = bytearray(len)\n",
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" barray = await reader.readexactly(len)\n",
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" ###checking Environment.ENCODING not considered yet\n",
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" txt = barray.decode()\n",
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" if not txt.startswith('<text>'):\n",
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" txt = '\"<text>' + txt + '</text--->\"'\n",
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" \n",
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" return txt\n",
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" \n",
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" \n",
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" elif type_code == 19:\n",
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" ####readShortText()\n",
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" barray = bytearray(1) #readByte()\n",
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" barray = await reader.readexactly(1)\n",
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" len = int.from_bytes(barray, byteorder = 'big', signed = False)\n",
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" barray = bytearray(len)\n",
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" barray = await reader.readexactly(len)\n",
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" txt = barray.decode()\n",
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" if not txt.startswith('<text>'):\n",
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" txt = '\"<text>' + txt + '</text--->\"'\n",
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" \n",
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" return txt\n",
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" \n",
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" elif type_code == 20:\n",
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" ####readDouble()\n",
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" barray = bytearray(8)\n",
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" barray = await reader.readexactly(8)\n",
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" assert (int.from_bytes(barray, byteorder = 'big', signed = True)) >= 0, \"Invalid Double-Byte read from Stream!\"\n",
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" r = unpack('>d',barray)[0]\n",
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" return r\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": []
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.7.4"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}
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