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feat(parser): use str for SES EmailStr when email_validator package is omitted #1259

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feat(parser): use str for SES EmailStr when email_validator package is omitted #1259

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13 changes: 11 additions & 2 deletions aws_lambda_powertools/utilities/parser/models/ses.py
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Original file line number Diff line number Diff line change
@@ -1,12 +1,21 @@
import logging
import sys
from datetime import datetime
from typing import List, Optional
from typing import List, NewType, Optional

from pydantic import BaseModel, Field
from pydantic.networks import EmailStr
from pydantic.types import PositiveInt

from ..types import Literal

has_email_validator = "email_validator" in sys.modules
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@heitorlessa heitorlessa Jun 27, 2022 •
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I suspect this will always be False because Pydantic is loading it dynamically, and this will only be true afterwards. You'll need to check if the module is actually installed instead of loaded - I can't recall by heart a 3.6+ compatible way in importlib/pkg_resources to do that. I can help look for that after I finish another doc PR this week


if has_email_validator:
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we're gonna need #pragma: nocover too because this will decrease our tests despite being intended behaviour ;-)

from pydantic.networks import EmailStr
else:
logging.warning("email_validator package is not installed")
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Initialize a logger and change it to debug, so we'll know where it comes from.

logger = logging.getLogger(__name__)

...
logger.debug("email_validator package is not installed; using str instead")

EmailStr = NewType("EmailStr", str) # type: ignore[no-redef, misc]
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NewType has recently been converted to a class which means it'll have a runtime impact. Since we're looking at a string only IF someone didn't follow our recommended install, use a Type Alias instead.

You can also bring this up to save a else branch, for example:

from pydantic import BaseModel 


EmailStr = str

if has_email_validator:
    from pydantic import EmailStr


class Email(BaseModel):
        address: EmailStr


feedback_channel = Email("[email protected]")
print(feedback_channel.address)



class SesReceiptVerdict(BaseModel):
status: Literal["PASS", "FAIL", "GRAY", "PROCESSING_FAILED"]
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