/usr/lib/python2.7/dist-packages/pika/data.py is in python-pika 0.9.13-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 | """AMQP Table Encoding/Decoding"""
import struct
import decimal
import calendar
from datetime import datetime
from pika import exceptions
def encode_table(pieces, table):
"""Encode a dict as an AMQP table appending the encded table to the
pieces list passed in.
:param list pieces: Already encoded frame pieces
:param dict table: The dict to encode
:rtype: int
"""
table = table or dict()
length_index = len(pieces)
pieces.append(None) # placeholder
tablesize = 0
for (key, value) in table.iteritems():
if isinstance(key, unicode):
key = key.encode('utf-8')
pieces.append(struct.pack('B', len(key)))
pieces.append(key)
tablesize = tablesize + 1 + len(key)
tablesize += encode_value(pieces, value)
pieces[length_index] = struct.pack('>I', tablesize)
return tablesize + 4
def encode_value(pieces, value):
"""Encode the value passed in and append it to the pieces list returning
the the size of the encoded value.
:param list pieces: Already encoded values
:param any value: The value to encode
:rtype: int
"""
if isinstance(value, basestring):
if isinstance(value, unicode):
value = value.encode('utf-8')
pieces.append(struct.pack('>cI', 'S', len(value)))
pieces.append(value)
return 5 + len(value)
elif isinstance(value, bool):
pieces.append(struct.pack('>cB', 't', int(value)))
return 2
elif isinstance(value, int):
pieces.append(struct.pack('>ci', 'I', value))
return 5
elif isinstance(value, long):
pieces.append(struct.pack('>cq', 'l', value))
return 9
elif isinstance(value, decimal.Decimal):
value = value.normalize()
if value._exp < 0:
decimals = -value._exp
raw = int(value * (decimal.Decimal(10) ** decimals))
pieces.append(struct.pack('>cBi', 'D', decimals, raw))
else:
# per spec, the "decimals" octet is unsigned (!)
pieces.append(struct.pack('>cBi', 'D', 0, int(value)))
return 6
elif isinstance(value, datetime):
pieces.append(struct.pack('>cQ', 'T',
calendar.timegm(value.utctimetuple())))
return 9
elif isinstance(value, dict):
pieces.append(struct.pack('>c', 'F'))
return 1 + encode_table(pieces, value)
elif isinstance(value, list):
p = []
for v in value:
encode_value(p, v)
piece = ''.join(p)
pieces.append(struct.pack('>cI', 'A', len(piece)))
pieces.append(piece)
return 5 + len(piece)
elif value is None:
pieces.append(struct.pack('>c', 'V'))
return 1
else:
raise exceptions.UnspportedAMQPFieldException(pieces, value)
def decode_table(encoded, offset):
"""Decode the AMQP table passed in from the encoded value returning the
decoded result and the number of bytes read plus the offset.
:param str encoded: The binary encoded data to decode
:param int offset: The starting byte offset
:rtype: tuple
"""
result = {}
tablesize = struct.unpack_from('>I', encoded, offset)[0]
offset += 4
limit = offset + tablesize
while offset < limit:
keylen = struct.unpack_from('B', encoded, offset)[0]
offset += 1
key = encoded[offset: offset + keylen]
offset += keylen
value, offset = decode_value(encoded, offset)
result[key] = value
return result, offset
def decode_value(encoded, offset):
"""Decode the value passed in returning the decoded value and the number
of bytes read in addition to the starting offset.
:param str encoded: The binary encoded data to decode
:param int offset: The starting byte offset
:rtype: tuple
:raises: pika.exceptions.InvalidFieldTypeException
"""
kind = encoded[offset]
offset += 1
# Bool
if kind == 't':
value = struct.unpack_from('>B', encoded, offset)[0]
value = bool(value)
offset += 1
# Short-Short Int
elif kind == 'b':
value = struct.unpack_from('>B', encoded, offset)[0]
offset += 1
# Short-Short Unsigned Int
elif kind == 'B':
value = struct.unpack_from('>b', encoded, offset)[0]
offset += 1
# Short Int
elif kind == 'U':
value = struct.unpack_from('>h', encoded, offset)[0]
offset += 2
# Short Unsigned Int
elif kind == 'u':
value = struct.unpack_from('>H', encoded, offset)[0]
offset += 2
# Long Int
elif kind == 'I':
value = struct.unpack_from('>i', encoded, offset)[0]
offset += 4
# Long Unsigned Int
elif kind == 'i':
value = struct.unpack_from('>I', encoded, offset)[0]
offset += 4
# Long-Long Int
elif kind == 'L':
value = long(struct.unpack_from('>q', encoded, offset)[0])
offset += 8
# Long-Long Unsigned Int
elif kind == 'l':
value = long(struct.unpack_from('>Q', encoded, offset)[0])
offset += 8
# Float
elif kind == 'f':
value = long(struct.unpack_from('>f', encoded, offset)[0])
offset += 4
# Double
elif kind == 'd':
value = long(struct.unpack_from('>d', encoded, offset)[0])
offset += 8
# Decimal
elif kind == 'D':
decimals = struct.unpack_from('B', encoded, offset)[0]
offset += 1
raw = struct.unpack_from('>i', encoded, offset)[0]
offset += 4
value = decimal.Decimal(raw) * (decimal.Decimal(10) ** -decimals)
# Short String
elif kind == 's':
length = struct.unpack_from('B', encoded, offset)[0]
offset += 1
value = encoded[offset: offset + length].decode('utf8')
try:
value = str(value)
except UnicodeEncodeError:
pass
offset += length
# Long String
elif kind == 'S':
length = struct.unpack_from('>I', encoded, offset)[0]
offset += 4
value = encoded[offset: offset + length].decode('utf8')
try:
value = str(value)
except UnicodeEncodeError:
pass
offset += length
# Field Array
elif kind == 'A':
length = struct.unpack_from('>I', encoded, offset)[0]
offset += 4
offset_end = offset + length
value = []
while offset < offset_end:
v, offset = decode_value(encoded, offset)
value.append(v)
# Timestamp
elif kind == 'T':
value = datetime.utcfromtimestamp(struct.unpack_from('>Q', encoded,
offset)[0])
offset += 8
# Field Table
elif kind == 'F':
(value, offset) = decode_table(encoded, offset)
# Null / Void
elif kind == 'V':
value = None
else:
raise exceptions.InvalidFieldTypeException(kind)
return value, offset
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