def round_trip64(self, nnn):
"""
Test writing and reading a 64-bit integer as the first and
only field in a buffer
"""
chan = Channel(LEN_BUFF)
# -- write 64-bit value -------------------------------------
field_nbr = 1 + self.rng.next_int16(1024)
write_b64_field(chan, nnn, field_nbr)
chan.flip()
# # DEBUG
# buf = chan.buffer
# print "buffer after writing varint field: ",
# dumpBuffer(buf)
# # END
# -- read 64-bit value --------------------------------------
# first the header (which is a varint) ------------
(field_type, field_nbr2) = read_field_hdr(chan)
offset2 = chan.position
self.assertEqual(PrimTypes.B64, field_type)
self.assertEqual(field_nbr, field_nbr2)
self.assertEqual(
length_as_varint(field_hdr_val(field_nbr, PrimTypes.B64)), offset2)
# then the varint proper --------------------------
varint_ = read_raw_b64(chan)
offset3 = chan.position
self.assertEqual(nnn, varint_)
self.assertEqual(offset2 + 8, offset3)
def round_trip32(self, nnn):
"""
Test writing and reading a 32-bit integer as the first and
only field in a buffer.
"""
chan = Channel(LEN_BUFF)
# -- write 32-bit value -------------------------------------
field_nbr = 1 + self.rng.next_int16(1024)
write_b32_field(chan, nnn, field_nbr)
chan.flip()
# -- read 32-bit value --------------------------------------
# first the header (which is a varint) ------------
(field_type, field_nbr2) = read_field_hdr(chan)
offset2 = chan.position
self.assertEqual(PrimTypes.B32, field_type)
self.assertEqual(field_nbr, field_nbr2)
self.assertEqual(
length_as_varint(field_hdr_val(field_nbr, PrimTypes.B32)), offset2)
# then the varint proper --------------------------
varint_ = read_raw_b32(chan)
offset3 = chan.position
self.assertEqual(nnn, varint_)
self.assertEqual(offset2 + 4, offset3)
def round_trip(self, nnn):
"""
Test writing and reading a varint as the first and
only field in a buffer.
"""
# -- write varint -------------------------------------------
field_nbr = 1 + self.rng.next_int16(1024)
chan = Channel(LEN_BUFFER)
write_varint_field(chan, nnn, field_nbr)
chan.flip()
# -- read varint --------------------------------------------
# first the header (which is a varint) ------------
(prim_type, field_nbr2) = read_field_hdr(chan)
offset2 = chan.position
self.assertEqual(PrimTypes.VARINT, prim_type)
self.assertEqual(field_nbr, field_nbr2)
self.assertEqual(length_as_varint(field_nbr << 3), offset2)
# then the varint proper --------------------------
varint_ = read_raw_varint(chan)
chan.flip()
offset3 = chan.limit
self.assertEqual(nnn, varint_)
self.assertEqual(offset2 + length_as_varint(nnn), offset3)
def recv_from_cnx(cnx, chan):
"""
Receive a serialized message from a connection into a channel.
On return the channel has been flipped (offset = 0, limit =
data length). Returns the msgNbr.
"""
# ---------------------------------------------------------------
# SEE fieldz.msgImpl for an example of this kind of Channel
# manipulation. Use a Python buffer to select the region of the
# buffer we want to write into.
# ---------------------------------------------------------------
# receive something from the connection
chan.clear()
count = cnx.recv_into(chan.buffer, BUFSIZE)
if count <= 0:
raise IOError('initial read of message gets zero bytes')
# read the header to determine the message type and its length
(p_type, msg_nbr) = read_field_hdr(chan)
# DEBUG
print("CHAN_IO: count = %d; pType = %s, msgNbr = %s" %
(count, p_type, msg_nbr))
# END
if p_type != PrimTypes.LEN_PLUS:
raise IOError('message header type is %d, not PrimTypes.LEN_PLUS' %
p_type)
# XXX raise exception of msgNbr <0 or msgNbr > 2
msg_len = read_raw_varint(chan)
# XXX ignoring pathological possibility that offset > count
# if we don't have all of the data, loop getting the rest
while count < msg_len:
# vBuf = buffer(chan.buffer, count)
v_buf = memoryview(chan.buffer)[count:]
count += cnx.recv_into(v_buf, BUFSIZE - count)
chan.position = count
chan.flip()
return msg_nbr
def round_trip(self, string):
"""
Verify that a unicode string converted to wire format and then
back again is the same string.
This tests writing and reading a string of bytes as the first and
only field in a buffer.
"""
chan = Channel(LEN_BUFF)
# -- write the bytearray ------------------------------------
field_nbr = 1 + self.rng.next_int16(1024)
write_len_plus_field(chan, string, field_nbr)
chan.flip()
# # DEBUG
# print("buffer after writing lenPlus field: " + str(chan.buffer))
# # END
# -- read the value written ---------------------------------
# first the header (which is a varint) ------------
(field_type, field_nbr2,) = read_field_hdr(chan)
offset2 = chan.position
self.assertEqual(PrimTypes.LEN_PLUS, field_type)
self.assertEqual(field_nbr, field_nbr2)
self.assertEqual(
length_as_varint(field_hdr_val(field_nbr, PrimTypes.LEN_PLUS)),
offset2)
# then the actual value written -------------------
tstamp = read_raw_len_plus(chan)
offset3 = chan.position
self.assertEqual(string, tstamp)
self.assertEqual(
offset2 +
length_as_varint(
len(string)) +
len(string),
offset3)
def read(cls, chan, parent_spec):
"""msg refers to the msg, n is field number; returns msg, n"""
(p_type, nnn) = read_field_hdr(chan)
if nnn < 0 or nnn >= len(parent_spec.msgs):
raise RuntimeError("msg ID '%s' out of range" % nnn)
msg_spec = parent_spec.msgs[nnn]
msg_len = read_raw_varint(chan)
# DEBUG
print("IMPL_GETTER, P_TYPE %d, MSG/FIELD NBR %d, MSG_LEN %d" % (
p_type, nnn, msg_len))
# END
end = chan.position + msg_len
cls = _make_msg_class(parent_spec, msg_spec) # generated class
fields = [] # ???
values = [] # ???
# XXX THIS IS NOT GOING TO WORK, BECAUSE WE NEED TO PEEK XXX
for f_class in cls._fieldClasses:
field_type = f_class._field_type # a number
f_quant = f_class._quantifier
field_nbr = f_class._field_nbr
# read the field header
(p_type, nbr) = read_field_hdr(chan)
# DEBUG
print(
" GET_FROM_CHAN, FIELD %u, TYPE %u" %
(field_nbr, field_type))
# END
if field_nbr != nbr:
raise RuntimeError(" EXPECTED FIELD_NBR %d, GOT %d" % (
field_nbr, nbr))
if f_quant == Q_REQUIRED or f_quant == Q_OPTIONAL:
if field_type > 23:
reg = cls.msg_spec.reg
# BEGIN JUNK ------------------------------------
# DEBUG
print(
"READING: FIELD TYPE IS %s" %
reg.reg_id2name(field_type))
# END
entry = reg.reg_id2entry(field_type)
print("READING: FIELD TYPE bis IS %s" % entry.name)
# END JUNK --------------------------------------
child_spec = entry.msg_spec
child_class = _make_msg_class(msg_spec, child_spec)
# RECURSE: read(childCls, chan, msgSpec)
# msgSpec is parentSpec here
value = T_GET_FUNCS[field_type](chan) # XXX WRONG
else:
value = T_GET_FUNCS[field_type](chan)
_check_position(chan, end)
values.append(value)
elif f_quant == Q_PLUS or f_quant == Q_STAR:
v_list = [] # we are reading a list of values
# WORKING HERE
else:
raise RuntimeError("unknown quantifier, index '%u'" % f_quant)
# DEBUG
print("AFTER COLLECTING %u FIELDS, OFFSET IS %u" % (
len(fields), chan.position))
# END
# XXX BLOWS UP: can't handle Q_PLUS or Q_STAR (about line 407)
return (cls(values), nnn) # GEEP
def get_next(self):
(self._p_type, self._field_nbr) = read_field_hdr(self)
# getter has range check
field_type = self._field_type = self._msg_spec.field_type_ndx(
self._field_nbr)
# gets through dispatch table -------------------------------
if field_type >= 0 and field_type <= ftypes.V_SINT64:
self._value = T_GET_FUNCS[field_type](self)
return
# we use the field type to verify that have have read the right
# primitive type
# # - implemented using varints -------------------------------
# if self._fType <= ftypes._V_UINT64:
# if self._pType != VARINT_TYPE:
# raise RuntimeError("pType is %u but should be %u" % (
# self._pType, VARINT_TYPE))
# (self._value, self._position) = readRawVarint(
# self)
# # DEBUG
# print "getNext: readRawVarint returns value = 0x%x" % self._value
# # END
# if self._fType == ftypes._V_SINT32:
# self._value = decodeSint32(self._value)
# # DEBUG
# print " after decode self._value is 0x%x" % self._value
# #
# elif self._fType == ftypes._V_SINT64:
# self._value = decodeSint64(self._value)
# #END VARINT_GET
# implemented using B32 -------------------------------------
if self._field_type <= ftypes.F_FLOAT:
self._p_type = B32_TYPE # DEBUG
varint_ = read_raw_b32(self)
if self._field_type == ftypes.F_UINT32:
self._value = ctypes.c_uint32(varint_).value
elif self._field_type == ftypes.F_SINT32:
self._value = ctypes.c_int32(varint_).value
else:
raise NotImplementedError('B32 handling for float')
# implemented using B64 -------------------------------------
elif self._field_type <= ftypes.F_DOUBLE:
self._p_type = B64_TYPE # DEBUG
(varint_, self._position) = read_raw_b64(self)
if self._field_type == ftypes.F_UINT64:
self._value = ctypes.c_uint64(varint_).value
elif self._field_type == ftypes.F_SINT64:
self._value = ctypes.c_int64(varint_).value
else:
raise NotImplementedError('B64 handling for double')
# implemented using LEN_PLUS --------------------------------
elif self._field_type <= ftypes.L_MSG:
self._p_type = LEN_PLUS_TYPE # DEBUG
varint_ = read_raw_len_plus(self)
if self._field_type == ftypes.L_STRING:
self._value = varint_.decode('utf-8')
elif self._field_type == ftypes.L_BYTES:
self._value = varint_
else:
raise NotImplementedError('LEN_PLUS handled as L_MSG')
# implemented using B128, B160, B256 ------------------------
elif self._field_type == ftypes.F_BYTES16:
self._p_type = B128_TYPE # DEBUG
self._value = read_raw_b128(self)
elif self._field_type == ftypes.F_BYTES20:
self._p_type = B160_TYPE # DEBUG
self._value = read_raw_b160(self)
elif self._field_type == ftypes.F_BYTES32:
self._p_type = B256_TYPE # DEBUG
self._value = read_raw_b256(self)
else:
raise NotImplementedError(
"decode for type %d has not been implemented" % self._field_type)
