Bases: RecordStore
A record store for result records.
Collocates result metadata with result data.
Source code in src/prefect/records/result_store.py
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 | @dataclass
class ResultRecordStore(RecordStore):
"""
A record store for result records.
Collocates result metadata with result data.
"""
result_store: ResultStore
cache: Optional[PersistedResult] = None
def exists(self, key: str) -> bool:
try:
record = self.read(key)
if not record:
return False
result = record.result
result.get(_sync=True)
if result.expiration:
# if the result has an expiration,
# check if it is still in the future
exists = result.expiration > pendulum.now("utc")
else:
exists = True
self.cache = result
return exists
except Exception:
return False
def read(self, key: str, holder: Optional[str] = None) -> TransactionRecord:
if self.cache:
return TransactionRecord(key=key, result=self.cache)
try:
result = PersistedResult(
serializer_type=self.result_store.serializer.type,
storage_block_id=self.result_store.result_storage_block_id,
storage_key=key,
)
return TransactionRecord(key=key, result=result)
except Exception:
# this is a bit of a bandaid for functionality
raise ValueError("Result could not be read")
def write(self, key: str, result: Any, holder: Optional[str] = None) -> None:
if isinstance(result, PersistedResult):
# if the value is already a persisted result, write it
result.write(_sync=True)
elif not isinstance(result, BaseResult):
run_coro_as_sync(self.result_store.create_result(obj=result, key=key))
def supports_isolation_level(self, isolation_level: IsolationLevel) -> bool:
return isolation_level == IsolationLevel.READ_COMMITTED
|