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import psycopg
from psycopg.adapt import Loader, Dumper
from psycopg.pq import Format
from ..utils import Vector
class VectorDumper(Dumper):
format = Format.TEXT
def dump(self, obj):
return Vector._to_db(obj).encode('utf8')
class VectorBinaryDumper(VectorDumper):
format = Format.BINARY
def dump(self, obj):
return Vector._to_db_binary(obj)
class VectorLoader(Loader):
format = Format.TEXT
def load(self, data):
if isinstance(data, memoryview):
data = bytes(data)
return Vector._from_db(data.decode('utf8'))
class VectorBinaryLoader(VectorLoader):
format = Format.BINARY
def load(self, data):
if isinstance(data, memoryview):
data = bytes(data)
return Vector._from_db_binary(data)
def register_vector_info(context, info):
if info is None:
raise psycopg.ProgrammingError('vector type not found in the database')
info.register(context)
# add oid to anonymous class for set_types
text_dumper = type('', (VectorDumper,), {'oid': info.oid})
binary_dumper = type('', (VectorBinaryDumper,), {'oid': info.oid})
adapters = context.adapters
adapters.register_dumper('numpy.ndarray', text_dumper)
adapters.register_dumper('numpy.ndarray', binary_dumper)
adapters.register_dumper(Vector, text_dumper)
adapters.register_dumper(Vector, binary_dumper)
adapters.register_loader(info.oid, VectorLoader)
adapters.register_loader(info.oid, VectorBinaryLoader)
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