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span_pointers.py
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from itertools import chain
import logging
import os
from typing import List
from typing import Optional
from ddtrace._trace._span_pointer import _SpanPointerDirection
from ddtrace._trace._span_pointer import _SpanPointerDescription
from datadog_lambda.trigger import EventTypes
logger = logging.getLogger(__name__)
dd_botocore_add_span_pointers = os.environ.get(
"DD_BOTOCORE_ADD_SPAN_POINTERS", "true"
).lower() in ("true", "1")
def calculate_span_pointers(
event_source,
event,
botocore_add_span_pointers=dd_botocore_add_span_pointers,
) -> List[_SpanPointerDescription]:
try:
if botocore_add_span_pointers:
if event_source.equals(EventTypes.S3):
return _calculate_s3_span_pointers_for_event(event)
elif event_source.equals(EventTypes.DYNAMODB):
return _calculate_dynamodb_span_pointers_for_event(event)
except Exception as e:
logger.debug(
"failed to calculate span pointers for event: %s",
e,
)
return []
def _calculate_s3_span_pointers_for_event(event) -> List[_SpanPointerDescription]:
# Example event:
# https://docs.aws.amazon.com/lambda/latest/dg/with-s3.html
return list(
chain.from_iterable(
_calculate_s3_span_pointers_for_event_record(record)
for record in event.get("Records", [])
)
)
def _calculate_s3_span_pointers_for_event_record(
record,
) -> List[_SpanPointerDescription]:
# Event types:
# https://docs.aws.amazon.com/AmazonS3/latest/userguide/notification-how-to-event-types-and-destinations.html
if record.get("eventName").startswith("ObjectCreated:"):
s3_information = record.get("s3", None)
if s3_information is not None:
return _calculate_s3_span_pointers_for_object_created_s3_information(
s3_information
)
return []
def _calculate_s3_span_pointers_for_object_created_s3_information(
s3_information,
) -> List[_SpanPointerDescription]:
try:
bucket = s3_information["bucket"]["name"]
key = s3_information["object"]["key"]
etag = s3_information["object"]["eTag"]
except KeyError as e:
logger.debug(
"missing s3 information required to make a span pointer: %s",
e,
)
return []
try:
from ddtrace._trace.utils_botocore.span_pointers.s3 import (
_aws_s3_object_span_pointer_description,
)
try:
span_pointer_description = _aws_s3_object_span_pointer_description(
operation="S3.LambdaEvent",
pointer_direction=_SpanPointerDirection.UPSTREAM,
bucket=bucket,
key=key,
etag=etag,
)
except TypeError:
# The older version of this function did not have an operation
# parameter.
span_pointer_description = _aws_s3_object_span_pointer_description(
pointer_direction=_SpanPointerDirection.UPSTREAM,
bucket=bucket,
key=key,
etag=etag,
)
if span_pointer_description is None:
return []
return [span_pointer_description]
except Exception as e:
logger.debug(
"failed to generate S3 span pointer: %s",
e,
)
return []
def _calculate_dynamodb_span_pointers_for_event(event) -> List[_SpanPointerDescription]:
# Example event:
# https://docs.aws.amazon.com/lambda/latest/dg/with-ddb.html
return list(
chain.from_iterable(
_calculate_dynamodb_span_pointers_for_event_record(record)
for record in event.get("Records", [])
)
)
def _calculate_dynamodb_span_pointers_for_event_record(
record,
) -> List[_SpanPointerDescription]:
try:
table_name = _extract_table_name_from_dynamodb_stream_record(record)
if table_name is None:
return []
primary_key = record["dynamodb"]["Keys"]
except Exception as e:
logger.debug(
"missing DynamoDB information required to make a span pointer: %s",
e,
)
return []
try:
from ddtrace._trace.utils_botocore.span_pointers.dynamodb import (
_aws_dynamodb_item_span_pointer_description,
)
try:
span_pointer_description = _aws_dynamodb_item_span_pointer_description(
operation="DynamoDB.LambdaEvent",
pointer_direction=_SpanPointerDirection.UPSTREAM,
table_name=table_name,
primary_key=primary_key,
)
except TypeError:
# The older version of this function did not have an operation
# parameter.
span_pointer_description = _aws_dynamodb_item_span_pointer_description(
pointer_direction=_SpanPointerDirection.UPSTREAM,
table_name=table_name,
primary_key=primary_key,
)
if span_pointer_description is None:
return []
return [span_pointer_description]
except Exception as e:
logger.debug(
"failed to generate DynamoDB span pointer: %s",
e,
)
return []
def _extract_table_name_from_dynamodb_stream_record(record) -> Optional[str]:
# Example eventSourceARN:
# arn:aws:dynamodb:us-east-2:123456789012:table/my-table/stream/2024-06-10T19:26:16.525
event_source_arn = record["eventSourceARN"]
[_arn, _aws, _dynamodb, _region, _account, dynamodb_info] = event_source_arn.split(
":", maxsplit=5
)
if _arn != "arn" or _aws != "aws" or _dynamodb != "dynamodb":
logger.debug("unexpected eventSourceARN format: %s", event_source_arn)
return None
[_table, table_name, _stream, _timestamp] = dynamodb_info.split("/")
if _table != "table" or _stream != "stream":
logger.debug("unexpected eventSourceARN format: %s", event_source_arn)
return None
return table_name